JPH0882845A - camera - Google Patents

Abstract

PURPOSE: To prevent the quality of a printed image from being deteriorated by trimming zoom. CONSTITUTION: This camera is provided with a photographic optical system 30, a finder optical system 4, a trimming/zooming means 1a for changing only the power of the finder optical system 4, to execute zooming, a release switch, a zoom lever, a mode selecting button, an LCD for external display, an LCD for display in a finder, a sounding means, a zoom code disk 81, a zoom code armature 85, a magnetic head and a control means. The control means reads ISO sensitivity, a printed picture format, a desired printing size and trimming magnification S, at the time of zooming to a telephoto side, to obtain a grain size γ based on them and judge whether γmax (allowable grain size) >=γ is obtained or not, inhibits the zooming to the telephoto side, when γmax <γ is obtained and informs a photographer the fact by the LCD for the display in the finder, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of obtaining a pseudo telephoto effect by trimming during printing.

[0002]

2. Description of the Related Art There is known a trimming zoom camera (camera) which obtains a pseudo telephoto effect by printing a screen area on a film corresponding to an actual view screen visually recognized by a finder optical system on photographic paper. In such a camera, during zooming, only the viewfinder optical system is zoomed, and during shooting, the magnification rate and range of zooming, etc., that is, the film corresponding to the actual view screen visually recognized by the viewfinder optical system. Trimming information identifying the upper screen area is written to the film. When the photographed film is printed on the photographic paper, trimming is performed based on the trimming information read from the film, whereby a photograph with a telephoto effect can be obtained.

However, in the case of this trimming zoom camera, when printing from film to photographic paper, the image is enlarged based on the trimming information, so that the image quality fluctuates greatly. Therefore, the trimming zoom is performed randomly. When the image is photographed, the silver particles and the blurred area of the film are enlarged and printed by trimming, which causes a problem that the particles are coarse, the blur is conspicuous, and the image quality is poor.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a camera capable of preventing photography of poor image quality based on trimming zoom.

[0005]

The above objects are achieved by the present invention described in (1) to (6) below.

(1) A photographing optical system for forming a subject image on a film surface, a finder optical system capable of changing the magnification, a magnification changing means for changing the magnification of the finder optical system, and an operation of the magnification changing means. And a control means for controlling
A camera for obtaining a pseudo telephoto effect by printing a screen area on a film corresponding to an actual visual field screen visually recognized by the finder optical system on a photographic paper, and for zooming to the telephoto side of the finder optical system. At this time, if the image quality of the print image exceeds the allowable range, the control means controls so as to prohibit an increase in magnification of the finder optical system.

(2) The control means has an arithmetic unit for creating image quality information indicating the image quality of a print image when printed from film to photographic paper, and zooming to the telephoto side of the finder optical system. At this time, it is determined whether the image quality of the print image is within an allowable range based on the image quality information created by the calculation unit (1).
The camera described in.

(3) The camera according to (2), wherein the control means obtains, as the image quality information, a silver particle size of a film in the print image or a confusion circle diameter in the print image.

(4) The camera according to any one of (1) to (3) above, which has a notifying unit for notifying that the image quality of the print image exceeds an allowable range.

(5) The image quality of the print image is desired by the photographer, trimming information for specifying the screen area on the film corresponding to the actual view screen visually recognized by the finder optical system, the film sensitivity, the print screen format. 5. The camera according to any one of (1) to (4) above, which is determined based on at least one of the print size, exposure information, the distance from the camera to the subject, and the focal length of the photographing optical system.

(6) In any one of the above (1) to (5), there is provided recording means for recording trimming information for specifying a screen area on the film corresponding to an actual visual field screen visually recognized by the finder optical system. Camera.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The camera of the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings. FIG. 1 is a perspective view showing a first embodiment of the camera of the present invention. As shown in the figure, the camera (trimming zoom camera) 1 of the first embodiment
A has a camera body 2, and on the front surface (front surface) of the camera body 2, a photographing optical system 30, a lens barrel 31 of the photographing optical system 30, and a distance measuring unit 74 are provided on the rear surface of the camera body 2. The zoom lever 72 is provided on the upper surface of the camera body 2 as a liquid crystal display element (LCD) for external display which is an external display means.
5, a sound producing means 76, a release switch 71, and a plurality of mode selection buttons 77, and a zoom inhibition canceling switch 78 on the side surface of the camera body 2, respectively, to increase the magnification from the front to the back of the camera body 2. A finder optical system (finder variable magnification optical system) 4 that can be changed is installed.

Further, the camera 1A has a trimming zoom means which is a zooming means for changing the magnification of the finder optical system 4. FIG. 2 is a perspective view showing a configuration example of the trimming zoom means of the camera 1A. As shown in the figure, the trimming zoom means 1a has a zoom driving zoom motor 11 and a cam plate 43 having a substantially rectangular overall shape. The cam plate 43 is arranged in a direction perpendicular to the optical axis 45 of the finder optical system 4 with respect to the camera body 2.
It is installed so that it can be moved.

The finder optical system 4 is arranged in order from the objective side.
First variable-magnification optical system lens 41, second variable-magnification optical system lens 42, and eyepiece optical system not shown (eyepiece lens)
The second variable-magnification optical system lens 42 is installed movably in the direction of the optical axis 45 of the finder optical system 4 with respect to the camera body 2, and the first variable-magnification optical system lens 41 and Each eyepiece optical system is fixedly installed on the camera body 2.

The cam plate 43 has a cam groove 431 and a guide groove 432 for restricting the direction when the cam plate 43 is moved.
And are formed. In this case, the guide groove 432 is formed in a direction perpendicular to the optical axis 45 of the finder optical system 4, and the cam groove 431 is formed to be inclined at a predetermined angle with respect to the guide groove 432.

Two projections 441 and 442 formed on the camera body 2 are inserted into the guide groove 432, and the cam plate 43 is provided with the guide groove 432 and both projections 44.
1, 442 can move only in the longitudinal direction of the guide groove 432.

The second variable magnification optical system lens 42 is regulated by a regulation member (not shown) so as to be movable only in the direction of the optical axis 45 thereof, and the cam groove 431 has the second variable magnification optical system lens 42. Protrusion 42 that is provided under the double optical system lens 42
1 is inserted. When the cam plate 43 is moved, the protrusion 421 moves along the cam groove 431, and the second
The variable power optical system lens 42 moves in the direction of the optical axis 45.

Here, one end of the cam groove 431 has a wide-angle end 46.
1, the other end of the cam groove 431 is a telephoto end 462.
At the wide-angle end 461, the real-field-of-view screen visually recognized by the finder optical system 4 corresponds to the screen area corresponding to the print screen format of the screen on the film 100.
In the range from 1 to the telephoto end 462, excluding the wide-angle end 461, the real view screen visually recognized by the finder optical system 4 and the screen trimmed on the film correspond to each other.

Power from the zoom motor 11 is transmitted to a cam plate 43, which is a driven member, via a speed change mechanism (power relay portion) 9 having a plurality of gears including a pinion gear 91, whereby the cam plate 43 is moved. The guide groove 432 is configured to be movable in the longitudinal direction. In this case, the cam plate 4
A rack gear 433 that meshes with the pinion gear 91 of the transmission mechanism 9 is formed on the rear surface of the front end portion of the No. 3 along the direction parallel to the guide groove 432.

In the camera 1A, pseudo zooming (trimming zoom) is performed by such a trimming zooming means 1a. Note that the "pseudo variable power" is a film corresponding to an actual visual field screen in which the photographic optical system 30 is not zoomed but the finder optical system 4 is zoomed and visually recognized by the scaled finder optical system 4. Trimming the upper screen area and printing the trimmed area obtains the telephoto effect.

A zoom code plate 81 is installed on the rear end surface of the cam plate 43. This zoom code board 81
Has a predetermined pattern of conduction and non-conduction in the guide groove 432.
It has the conductive plates formed and arranged in four rows along the direction parallel to. A zoom code is formed by this conductive plate.

The camera body 2 is also provided with a zoom cord contact piece 85 having four contact points. The zoom cord contact piece 85 is arranged so that its four contacts come into contact with the zoom cord of the zoom cord plate 81.

The zoom code plate 81 and the zoom code contact piece 85 constitute detection means for detecting the position of the cam plate 43 with respect to the camera body 2. in this case,
Depending on the ON / OFF pattern between the four contact points of the zoom cord contact piece 85 when they contact the zoom cord,
The position of the cam plate 43 with respect to the camera body 2 is detected, and the viewfinder optical system 4 after zoom driving corresponding to this position is detected.
The zoom magnification, that is, the trimming magnification S (trimming information) and the like are specified.

Here, the "trimming magnification S" means
The enlargement ratio of the trimming at the time of printing, that is, as shown in FIG. 8, a full-size frame (shooting) on the screen area 104 on the film 100 corresponding to the actual view screen visually recognized by the finder optical system 4 (shooting). screen)
The area ratio (≧ 1) of the screen area corresponding to the print screen format 103. The trimming magnification S corresponds to the magnification of the finder optical system 4 when the wide-angle end 461 is set to 1.

FIG. 3 is a partial sectional view showing the camera 1A. As shown in the figure, the camera 1A has a magnetic head 12 as a recording means. This magnetic head 12
It is arranged on the back side of the film 100 loaded in the camera 1A and at a position where it can face a magnetic track of the film 100 described later.

As shown in FIG. 3, the cartridge 100 is loaded in the cartridge loading section 27 of the camera 1A, one end of the film 100 exposed from the cartridge P is wound around the spool 28, and the back lid (not shown) is closed.
Is once wound around the spool 28, and the traveling is stopped at the shooting start position.

After shooting, the film 100 is
Until the next frame, the film is wound on the film winding shaft P1 installed in the cartridge P. And at the same time,
An electric signal of information to be recorded is input to the magnetic head 12, electromagnetically converted by the magnetic head 12, and magnetically recorded on a magnetic track of the running film 100.

FIG. 8 shows a screen area on the film 100,
It is a schematic diagram showing a correspondence with a screen on photographic paper. As shown in the figure, a magnetic track 101 is formed on one end side of the film 100 along the longitudinal direction thereof. On the magnetic track 101, the screen area 10 on the film 100 corresponding to the print screen format, the desired print size, and the actual view screen visually recognized by the finder optical system 4.
As the trimming information for specifying 4, the trimming magnification S, the determination result of the image quality of the print image based on the image quality information indicating the degree of the image quality of the print image when printed from the film 100 to the photographic paper 110 (hereinafter, simply Various types of information such as “image quality determination result”) are recorded by the magnetic head 12. Further, on the other end side of the film 100, a perforation 102 for film running control (film running and detection) is provided.

4 and 5 respectively show the camera 1A.
It is a figure which shows the inside of the finder. As shown in FIG.
The camera 1A has a liquid crystal display element (LCD) 6 for in-viewfinder display, which is in-viewfinder display means. As shown in FIG. 4, on the left side of the finder screen 63 in the finder in FIG.
A display area 60 for displaying by the CD 6 is formed. Then, below the display area 60, a star symbol 61 displays the image quality determination result based on the image quality information indicating the image quality of the print image when the film 100 is printed on the photographic paper 110. In this case, the number of displayed stars (0, 1, 2, 3) indicates the degree of image quality, and the smaller the number of stars, the better the image quality.

The image quality information includes trimming information (trimming magnification S), sensitivity of the film 100 (ISO sensitivity),
Print screen format (Hi-Vision size, 35
mm size and panorama size), print size desired by the photographer (service size, cabinet size, 6
Off, 4 out, half-cut and all paper), exposure information (aperture etc.),
Distance from camera 1A to subject and photographing optical system 30
It is created based on predetermined information of the focal lengths of the.
That is, the image quality of the print image printed from the film 100 onto the photographic paper 110 is determined based on the predetermined information. Here, the “decision” is not limited to the case of actually determining the image quality of the print image, but indirectly by determining the element for image quality determination without actually determining the image quality. This is a concept including the case of making a decision.

The trimming information (trimming magnification S) is used not only for designating the trimming magnification at the time of printing, but also as information for creating the image quality information, that is, information for determining the image quality of the print image. . Further, as shown in FIG. 5, in the lower part of the display area 60, in addition to the image quality determination result, the trimming magnification S is “numeral”.
It is indicated by the ".""X" symbol 62.

FIGS. 6 and 7 show the camera 1A, respectively.
3 is a plan view showing a display example of the LCD 5 for external display of FIG.
As shown in FIG. 6, in the lower right part of FIG. 6 on the LCD 5, the star symbol 51 indicates the image quality determination result based on the image quality information indicating the image quality of the print image when the film 100 is printed on the photographic paper 110. Is displayed. In this case, the number of stars displayed (0,
The degree of image quality is indicated by 1, 2, 3), and the smaller the number of stars, the better the image quality. Further, as shown in FIG.
At the center of the CD5, the trimming magnification S is "number".
It is indicated by the ".""X" symbol 52.

FIG. 9 is a block diagram showing a circuit configuration example of the camera 1A. As shown in the figure, the camera 1A has a control means 10. This control means 10 is usually
It is composed of a microcomputer (CPU) and controls zooming (control of operation of the trimming and zooming means 1a) described later, creation of image quality information indicating a degree of image quality of a print image when printed from the film 100 to the photographic paper 110, and In addition to the determination of the image quality based on the image quality information, sequence control, exposure calculation, execution of automatic exposure and automatic focusing, control of various functions in the camera 1A such as recording control of the magnetic head 12 are performed.

The control means 10 has a release switch 71.
a, photometric distance measuring switch 71b, telephoto side zoom switch 7
2a, wide-angle side zoom switch 72b, print screen format selection switch 73, zoom prohibition release switch 7
8, distance measuring means 74, photometric means 75, zoom cord contact piece 8
5, allowable particle size input means 14, film running detection means 16, ISO sensitivity detection means 17, desired print size input means 18, photographing optical system detection means 19, zoom control means 20, film running control means 21, notification control means 2
2. The information recording control means 23, the diaphragm driving means 24, the focus driving means 25, and the shutter driving means 26 are electrically connected to each other.

The zoom control means 20 has a zoom motor 11, the film travel control means 21 has a film travel motor 13, and the notification control means 22 has a sounding means 76.
LCD 6 for viewfinder display and L for external display
The magnetic head 12 is included in the CD 5 and the information recording control means 23.
Are electrically connected to each other.

The release switch 71 shown in FIG. 1 is composed of a two-stage switch. When the photometric distance measuring switch 71b (first stage) is turned on, the photometric means 75 and the distance measuring means 74, which will be described later, respectively operate, and further, Release switch 7
When 1a (second stage) is turned on, the shutter is driven by the shutter drive means 26 to take an image.

When the zoom lever 72 is displaced to the telephoto side, the telephoto side zoom switch 72a is turned on, and the zoom control means 20 moves the zoom motor 11 to the telephoto side while the telephoto side zoom switch 72a is turned on. Drive it. As a result, zooming of the finder optical system 4 to the telephoto side is performed.

On the contrary, when the zoom lever 72 is displaced to the wide-angle side, the wide-angle side zoom switch 72b is turned on, and the zoom control means 20 controls the zoom motor 11 to the wide-angle side while the wide-angle side zoom switch 72b is turned on. Drive to. As a result, zooming of the finder optical system 4 to the wide angle side is performed. The action and control of zooming to the telephoto side and the wide-angle side will be described later in detail.

Print screen format selection switch 7
3 is a switch for selecting a print screen format, that is, a normal size (35 mm size, an aspect ratio of 2: 3), a panoramic size (aspect ratio of about 1: 3) and a high-definition size (aspect ratio of 9:16). Is a switch for selecting any of the above, and when a desired print screen format is selected by the print screen format selection switch 73, the selected print screen format is set.

When the print screen format is set to the normal size (35 mm size) or the panoramic size, the actual view screen visually recognized by the finder optical system 4 as shown in FIG. By masking a part of the finder screen (high-definition size finder screen) 63 by the above device, the screen is changed to a screen having the same aspect ratio as the print screen format set above. In FIG. 4, a screen surrounded by a one-dot chain line is a finder screen 64 in a normal size (35 mm size), and a screen surrounded by a two-dot chain line is a finder screen 65 in a panoramic size. The masking is performed, for example, by shielding the light by driving a transmissive liquid crystal display segment installed in the finder.

When the high-definition size is basically used, in panoramic photography, the print screen is normally changed from the high-definition size to the panoramic size by enlarging and printing the upper and lower edges of the film in a light-shielding manner. In shooting with a 35 mm size), normally, the print screen is changed from the high-definition size to the normal size by enlarging and printing by shielding both ends of the film in the left-right direction.

As will be described later, the camera 1A prohibits (stops) zooming to the telephoto side when the image quality of the print image exceeds the allowable range during zooming to the telephoto side.
The zoom prohibition release switch 78
Is a switch for canceling the prohibition (stop) of zooming to the telephoto side. Zoom prohibition release switch 78
When is on, the prohibition of zooming to the telephoto side is released, and thus zooming to the telephoto side can be performed even when the image quality is out of the allowable range, and the zoom prohibition cancellation switch 78 is off. When the image quality of the print image exceeds the allowable range, zooming to the telephoto side is prohibited.

The photometric means 75 measures the brightness of the object by a light receiving element (not shown). The obtained information (photometric information) is input to the control means 10 to obtain an appropriate exposure amount. Based on the photometric information from 75, exposure calculation is performed in the calculation unit, and the aperture value (F number) and shutter speed are determined accordingly.

The distance measuring means 74 measures the distance information from the camera 1A to the object or the amount of defocus (defocus amount) with respect to the planned focal plane (film surface) in the camera 1A by, for example, a passive method. The obtained information (distance measurement information) is input to the control means 10.

The diaphragm driving means 24 has a motor for driving the diaphragm. As described above, when the brightness information of the subject is input from the photometry means 75 to the control means 10, the control means 10 performs an exposure calculation based on the brightness information to determine an appropriate aperture value and shutter speed. Then, a command signal for setting the diaphragm to the proper diaphragm value is input to the diaphragm driving means 24. The diaphragm driving unit 24 drives the diaphragm by rotating the diaphragm driving motor by a predetermined amount in response to this command.

The focus driving means 25 has a motor for driving a focusing point. As described above, the distance measuring means 74
When the distance measurement information is input to the control means 10 from the control means 10, the control means 10 inputs a command signal for focusing to the focus driving means 25 based on the distance measurement information. The focus drive means 25 drives the focusing drive motor by a predetermined amount in response to this focusing command, drives the focusing lens of the photographing optical system 30, and obtains the focused state. From the zoom cord contact piece 85, the cam plate 4 to the camera body 2
Signal corresponding to position 3 (eg, trimming magnification S)
Is input to the control means 10.

As shown in FIG. 3, in the cartridge loading section 27 of the camera 1A, the DX code provided on the cartridge P, that is, the DX code carrying the film information such as the ISO sensitivity of the film, is read from the ISO sensitivity information. An ISO sensitivity detecting means 17 for reading is provided. The ISO sensitivity detecting means 17 includes a plurality of contact points 17 in the form of protrusions.
1 is biased toward the inside of the cartridge loading section 27 by the coil springs 172, and is arranged along the vertical direction (width direction) of the film 100.

When the cartridge P is loaded in the cartridge loading section 27 of the camera 1A, D provided on the cartridge P is loaded.
Each contact 171 of the ISO sensitivity detecting means 17 comes into contact with the X code, and according to the pattern of conduction and non-conduction of the DX code,
A signal corresponding to the ISO sensitivity of the film 100 is input to the control means 10 and the ISO sensitivity is read.

The contacts of the mode selection button 77 shown in FIG. 1 are electrically connected to the desired print size input means 18 and the allowable particle size input means 14, and by operating this mode selection button 77, it will be described later. A desired print size (printing paper size), an allowable particle size, etc. can be input.

From the desired print size input means 18,
The print size (print paper size) desired by the photographer, for example, service size, cabinet size, 6 or 4 cut,
Signals corresponding to half-cut and full-sheet are input to the control means 10.

The permissible particle size input means 14 is means for inputting the permissible range (permissible particle size) of the silver particle size of the printed image when the film 100 is printed on the photographic paper 110. Allowable particle size input means 1
From 4, the signal corresponding to the allowable particle size γ _max determined by the photographer is input to the control means 10, and this allowable particle size γ _max is, as will be described later, the allowable range (boundary value) of the image quality of the print image. ) Is used as information.

The photographing optical system detecting means 19 includes the photographing optical system 3
It is a means for detecting a focal length of 0, an aperture value, and the like. For example, in the case of automatic exposure with aperture priority or manual exposure, a signal corresponding to the aperture value is sent to the control means 10 from the photographing optical system detection means 19. Is entered.

The film running control means 21 controls the film 1
At the time of feeding and winding 00, the film running motor 13 is driven to run the film. A signal indicating the traveling (winding) of the film 100 is input from the film traveling detection means 16 to the control means 10. And the control means 1
0 is based on the signal indicating the running of the film 100,
When the film is running, a recording signal is input to the information recording control means 23. Further, the control means 10 inputs a stop signal to the film running control means 21, and the film running control means 21 at the prescribed position on the basis of this stop signal.
00 is stopped.

When the recording signal is inputted from the control means 10, the information recording control means 23 causes the magnetic head 12 to move to the magnetic track 101 of the running film 100.
Various information such as trimming magnification S, print screen format, desired print size, and image quality judgment result is recorded.

The notification control means 22 drives the sounding means 76, and the sounding means 76 sends the image quality judgment result to, for example,
Notification is given by sound such as voice and buzzer. In this case, the degree of image quality is notified by voice, sound intensity, sound pitch, sound cycle, or the like.

Further, the notification control means 22 drives the LCD 6 for finder display and the LCD 5 for external display, respectively, and notifies the image quality determination result and the trimming magnification S by the LCD 6 and LCD 5, respectively. In this case, as described above, the number of displayed stars (0, 1, 2, 3) indicates the degree of image quality. Further, the trimming magnification S is read based on the signals input from the code plate 81 and the code contact piece 85, and the read trimming magnification S is displayed. The sounding means 76, the LCD 6 for displaying in the finder, and the LCD 5 for displaying externally constitute a notification means.

Next, the operation of the camera 1A during zooming will be described. [Zooming from the wide-angle side to the telephoto side] When the photographer displaces the zoom lever 72 to the telephoto side, the telephoto side zoom switch 72a is turned on, and the zoom motor 11 is rotationally driven clockwise in FIG. As a result, the pinion gear 91 rotates counterclockwise in FIG. 2 and at a reduced speed through the gears of the speed change mechanism 9, and the rack gear 433 and the pinion gear 91 are rotated.
The rotational motion of the pinion gear 91 is converted into a linear motion of the cam plate 43 by and the cam plate 43 moves to the left side in FIG.

When the cam plate 43 moves, the second variable magnification optical system lens 42 of the finder optical system 4 is moved along the optical axis 45 of the finder optical system 4 in FIG. 2 by the cam groove 431 and the projection 421. Front (first variable magnification optical system lens 4
1) toward the telephoto side.

At the wide-angle end 461, the film 10
0 corresponds to the screen area corresponding to the print screen format of the upper screen and the actual field of view viewed by the finder optical system 4. Therefore, the trimming magnification S = 1 is set to the magnetic track 101 via the magnetic head 12. And is printed at the trimming magnification S = 1 at the time of printing.

On the other hand, except for the wide-angle end 461, the film 1
The screen area corresponding to the print screen format of the screen on screen 00 does not correspond to the actual view screen visually recognized by the finder optical system 4. Therefore, the finder optical system 4
The trimming magnification S (> 1) is recorded on the magnetic track 101 via the magnetic head 12 as the trimming information for specifying the screen area on the film 100 corresponding to the real-field-of-view screen that is visually recognized at. Based on this, trimming is performed at the time of printing. The trimmed print image and the viewfinder image correspond to each other.

Further, during this zooming, as described above, the zoom code plate 81 and the zoom code contact piece 85 are used.
The trimming magnification S is read based on a signal input from the LCD, and the read trimming magnification S is used for the LCD 6 for display in the finder and the LCD 5 for external display.
Are displayed respectively.

[Zooming from the telephoto side to the wide-angle side] When the photographer displaces the zoom lever 72 to the wide-angle side, the wide-angle side zoom switch 72b is turned on, and the zoom motor 11 is driven to rotate in the opposite direction to the above. As a result, the pinion gear 91 rotates in the clockwise direction in FIG. 2 and at a reduced speed through the gears of the speed change mechanism 9, and the rack gear 433 and the pinion gear 91 rotate the pinion gear 91 into a linear motion of the cam plate 43. After being converted, the cam plate 43 moves to the right side in FIG.

When the cam plate 43 moves, the second variable-magnification optical system lens 42 of the finder optical system 4 is moved along the optical axis 45 of the finder optical system 4 in FIG. 2 by the cam groove 431 and the projection 421. Rear (first variable magnification optical system lens 4
It moves to a direction in which the distance between the first and second variable power optical system lenses 42 increases, that is, to the wide angle side.

Here, similarly to the above, the trimming magnification S = 1 at the wide-angle end 461 and the predetermined trimming magnification S (> 1) except the wide-angle end 461 are recorded on the magnetic track 101 via the magnetic head 12. Printing is performed based on the trimming magnification S. Further, similarly to the above, the trimming magnification S is displayed by the LCD 6 for displaying in the finder and the LCD 5 for displaying externally.

Next, the operation of the control means 10 during zooming will be described. [Zooming from the wide-angle side to the telephoto side] The control means (image quality information creating means) 10 has its arithmetic section to operate the film 1
The image quality information indicating the degree of image quality of the print image when printed on the photographic paper 110 from 00 is created. That is, the trimming magnification S ₁ (≧ 1), I of the film 100
Based on the SO sensitivity, print screen format and desired print size, the film 100 to the photographic paper 110
The silver particle size (particle size) γ of the printed image when printed on is calculated.

Then, based on the created image quality information, it is determined whether the image quality of the print image is within the allowable range. If the image quality exceeds the allowable range, zooming to the telephoto side (increase of magnification of the finder optical system 4). Is prohibited (stopped) and a notification that the allowable range is exceeded is issued. That is, the particle size γ is
Whether the particle size is within the allowable range of the silver particle size input from the allowable particle size input means 14 (allowable particle size (γ
_max ) ≧ particle size (γ)), and γ _max <
If it is γ, zooming to the telephoto side is prohibited, and the sounding means 76, the LCD 6 for displaying in the finder and the LCD 5 (notifying means) for external display show the image quality judgment result (γ _max <γ. ) Is notified.

Further, in order to inform the degree of image quality of the print image under the present conditions in more detail, when γ _max <γ, the particle size (γ) is further increased to a value (α) larger than 1. The determined value (γ / α) is determined whether it is included in the allowable range of the silver particle size input from the allowable particle size input means 14 (γ _max ≧ γ / α), and the image quality determination result is obtained. To inform. Hereinafter, a specific description will be given.

FIG. 10 is a flow chart showing the operation of the control means 10 during zooming to the telephoto side when the zoom prohibition canceling switch 78 is off. Hereinafter, description will be given based on this flowchart.

When the telephoto side zoom switch 72a is turned on, it is judged whether or not it is the telephoto end 462 based on the signals inputted from the code plate 81 and the code connecting piece 85 (step 501).

When it is determined in step 501 that the telephoto end 462 is not reached, the ISO sensitivity of the film 100 is read by the ISO sensitivity detecting means 17 (step 5).
02).

Next, the print screen format is read (step 503). Next, the desired print size is read (step 504). Next, the zoom motor 11 is rotationally driven (normal rotation) clockwise in FIG. 2 (step 505).

Next, the cord plate 81 and the cord contact piece 8
The trimming magnification S ₁ is specified on the basis of the signal input from 5 and the trimming magnification S ₁ is read (step 5
06).

Next, based on the ISO speed of the film 100, the print screen format, the desired print size, and the trimming magnification S ₁ , the silver particle size (particle size) γ of the print image when printed from the film 100 onto the photographic paper 110. Is calculated (step 507).

Here, as shown in Table 1, Table 2 and Table 3 below, the ISO sensitivity, print screen format and desired print size correspond to the coefficients γ ₁ , γ ₂ and γ ₃ , respectively. The particle size γ is calculated using these coefficients. This tabulated information is stored in advance in a memory (not shown) of the control means 10.

[0075]

[Table 1]

[0076]

[Table 2]

[0077]

[Table 3]

The control means 10 controls the read ISO sensitivity,
Coefficient gamma ₁ corresponding to the print screen format and desired print size, the gamma ₂ and gamma _3, respectively, read from the memory, each coefficient gamma _1, gamma ₂ and gamma
_The particle size γ is calculated by substituting ₃ and the read trimming magnification S ₁ into the following equation (1). γ = γ ₁ × γ ₂ × γ ₃ × S ₁ (1)

For example, when the ISO sensitivity is ISO 100, the print screen format is the panoramic size, the desired print size is the cabinet size, and the trimming magnification S ₁ is 2 times, γ ₁ = 1.2, γ ₂ = 1.5, γ ₃ = 2, S ₁
= 2 is substituted into the above formula (1), and it is calculated. The results are as follows. γ = γ ₁ × γ ₂ × γ ₃ × S ₁ = 1.2 × 1.5 × 2 × 2 = 7.2

Next, the allowable particle size γ _max input in advance by the photographer is read, and it is determined whether γ _max ≧ γ or not (step 508). For example, if γ _max = 9, then γ _max > γ, so “Y” is selected in step 508.

If it is determined in step 508 that γ _max ≧ γ, no warning is given. That is, the sound producing means 7
6 does not emit a buzzer sound and is an LCD for display in the viewfinder
6 and the LCD 5 for external display do not display a star mark, respectively. Then, based on the signals inputted from the cord plate 81 and the cord contact piece 85, it is judged whether or not it is the telephoto end 462 (step 509). If it is determined in step 509 that it is not the telephoto end 462, it is determined whether or not the telephoto side zoom switch 72a has been turned off (step 510).

When it is determined in step 510 that the telephoto side zoom switch 72a is turned on, the process returns to step 506 and steps 506 to 510 are executed again, and in step 510 the telephoto side zoom switch 72a.
When it is determined that a is off, the zoom motor 11 is stopped (step 511). Further, when it is determined at the telephoto end 462 in step 509, the zoom motor 11 is stopped (step 511).

In step 508, γ _max <γ
If it is determined that the zoom motor 11 is forcibly stopped, the zooming to the telephoto side is prohibited (stopped) (step 512). For example, in the case of already gamma _max <gamma when telephoto side zoom switch 72a is turned ON, the zoom motor 11 is not driven from the beginning, when a in the middle of zooming gamma _max <gamma is the zoom motor 11 , Γ
_The drive is forcibly stopped when _max <γ.

Then, it is determined whether γ _max ≧ γ / 1.5 (step 513). Γ in step 513
If it is determined that _max ≧ γ / 1.5, a warning of level 1 indicating that the image quality is the best among the warnings of three levels of levels 1, 2, and 3 is issued (step 514). That is, the sounding means 76 emits a small buzzer sound of large, medium and small, and the LCD 6 for displaying in the finder and the LCD 5 for displaying externally each display one star.

Then, it is determined whether or not the telephoto side zoom switch 72a is turned off (step 515). If it is determined in step 515 that the telephoto side zoom switch 72a is on, the process returns to step 514, and the warning is continued until it is determined in step 515 that the telephoto side zoom switch 72a is turned off.

In step 513, γ _max <γ
If it is determined that /1.5 is, γ _{ma x} ≧ γ / 2 determines whether or not (step 516). If it is determined in step 516 that γ _max ≧ γ / 2, a warning of level 2 showing intermediate image quality among levels 1 to 3 is issued (step 5
17). That is, the sounding means 76 emits a middle buzzer sound, and the LCD 6 for display in the finder and the LCD 5 for external display respectively display two star marks.

Then, it is judged whether or not the telephoto side zoom switch 72a is turned off (step 518). When it is determined in step 518 that the telephoto side zoom switch 72a is turned on, the process returns to step 517, and the warning is continued until it is determined in step 518 that the telephoto side zoom switch 72a is turned off.

In step 516, γ _max <γ
If it is determined to be / 2, a warning of level 3 indicating that the image quality is the worst out of levels 1 to 3 is issued (step 51).
9). That is, the sounding means 76 emits a large buzzer sound, and the LCD 6 for in-viewfinder display and the LCD 5 for external display each display three star marks.

Then, it is judged whether or not the telephoto side zoom switch 72a is turned off (step 520). When it is determined in step 520 that the telephoto side zoom switch 72a is turned on, the process returns to step 519 and the warning is continued until it is determined in step 520 that the telephoto side zoom switch 72a is turned off. This is the end of this program.

As described above, this program is for the case where the zoom prohibition canceling switch 78 is off, and when the zoom prohibition canceling switch 78 is on, the "zoom motor of step 512" is selected. The "stop" action is omitted. That is, even if it is determined in step 508 that γ _max <γ, the zoom motor 11 is not forcibly stopped (zooming to the telephoto side is prohibited) based on the determination.

[Zooming from the telephoto side to the wide-angle side] The control means (image quality information creating means) 10 controls the film 100 to the photographic paper 110 as in the case of the zooming to the telephoto side.
The particle size γ ′ of the print image is obtained as the image quality information indicating the degree of the image quality of the print image when printed.

Whether or not the particle size γ'is within the allowable range of the silver particle size input from the allowable particle size input means 14, that is, the allowable particle size (γ
_It is determined whether _max ) ≧ particle size (γ ′). Zooming to the wide-angle side is allowed regardless of this judgment result. When γ _max <γ ', the sound producing means 76, the LCD 6 for displaying in the finder and the LC for displaying externally.
The image quality determination result (γ _max <
γ ').

Further, in order to inform the degree of image quality of the print image in more detail, when γ _max <γ ', the particle size (γ') is further divided by a value (α) larger than 1. Whether (γ ′ / α) is included in the allowable range of the silver particle size input from the allowable particle size input means 14,
That is, it is determined whether γ _max ≧ γ ′ / α, and the image quality determination result is notified. Hereinafter, a specific description will be given.

FIG. 11 is a flowchart showing the operation of the control means 10 during zooming to the wide-angle side. Hereinafter, description will be given based on this flowchart. When the wide-angle side zoom switch 72b is turned on, the wide-angle end 461 is detected based on the signals input from the cord plate 81 and the cord contact piece 85.
It is determined whether or not (step 601).

When it is determined in step 601 that the wide-angle end 461 is not set, the ISO sensitivity of the film 100 is read by the ISO sensitivity detecting means 17 (step 6).
02).

Next, the print screen format is read (step 603). Next, the desired print size is read (step 604). Next, the zoom motor 11 is rotationally driven (reverse rotation) counterclockwise in FIG. 2 (step 605).

Next, the cord plate 81 and the cord contact piece 8
The trimming magnification S ₂ is specified on the basis of the signal input from 5 and the trimming magnification S ₂ is read (step 6).
06).

Then, based on the ISO sensitivity of the film 100, the print screen format, the desired print size and the trimming magnification S ₂ , the silver particle size (particle size) γ of the print image when printed from the film 100 onto the photographic paper 110. '(Step 60
7).

In this case, as in the case of zooming to the telephoto side, the control means 10 controls the coefficients γ ₁ and γ corresponding to the read ISO sensitivity, print screen format and desired print size shown in Tables 1 to 3 above. ₂ and γ ₃
Respectively from the memory, and each coefficient γ
₁ , γ ₂ and γ ₃ and the read trimming magnification S ₂
Substituting and into the following equation (2), the particle size γ ′ is calculated. γ '= γ ₁ × γ ₂ × γ ₃ × S ₂ (2)

Next, the permissible particle size γ _max input in advance by the photographer is read, and it is determined whether γ _max ≧ γ '(step 608). If γ _max ≧ γ 'is determined in step 608, no warning is given. That is, the sounding means 76 does not emit a buzzer sound, and the LCD 6 for displaying in the finder and the LCD for external displaying.
5 does not display an asterisk, respectively. And the code plate 8
1 and the signal input from the cord contact piece 85, it is determined whether or not it is the wide-angle end 461 (step 60).
9).

If it is determined in step 609 that the wide-angle end 461 is not set, the wide-angle side zoom switch 72b is selected.
Is turned off (step 610). When it is determined in step 610 that the wide-angle side zoom switch 72b is turned on, the process returns to step 606,
Steps 606 to 610 are executed again, and step 610
When it is determined that the wide-angle side zoom switch 72b has been turned off at, the zoom motor 11 is stopped (step 619). Also, in step 609, the wide-angle end 461
If so, the zoom motor 11 is stopped (step 619).

In step 608, γ _max <
If it is determined to be γ ′, it is determined whether γ _max ≧ γ ′ / 1.5 (step 611). When it is determined in step 611 that γ _max ≧ γ ′ / 1.5, a warning of level 1 indicating that the image quality is the best among the warnings of three levels of levels 1, 2, and 3 is issued (step 61).
2). That is, the sounding means 76 emits a small buzzer sound among large, medium and small, and the LCD for displaying in the finder.
6 and the LCD 5 for external display each have a star
Display one.

Next, it is judged whether or not the wide-angle side zoom switch 72b is turned off (step 613). If it is determined in step 613 that the wide-angle side zoom switch 72b is turned on, the process returns to step 606, and steps 606 and thereafter are executed again. When it is determined in step 613 that the wide-angle side zoom switch 72b is turned off, the zoom motor 11 is stopped (step 61).
9).

In step 611, γ _max <
When it is determined that γ ′ / 1.5, it is determined whether γ _max ≧ γ ′ / 2 (step 614). If it is determined in step 614 that γ _max ≧ γ ′ / 2, level 1
A warning of level 2 indicating an intermediate image quality out of 3 to 3 is issued (step 615). That is, the sounding means 76 emits a middle buzzer sound, and the LCD 6 for display in the finder and the LCD 5 for external display respectively display two star marks.

Then, it is judged whether or not the wide-angle side zoom switch 72b is turned off (step 616). When it is determined in step 616 that the wide-angle side zoom switch 72b is turned on, the process returns to step 606, and steps 606 and thereafter are executed again. When it is determined in step 616 that the wide-angle side zoom switch 72b is turned off, the zoom motor 11 is stopped (step 61).
9).

In step 614, γ _max <
If it is determined to be γ '/ 2, a warning of level 3 indicating that the image quality is the worst out of levels 1 to 3 is issued (step 6).
17). That is, the sounding means 76 emits a large buzzer sound, and the LCD 6 for in-viewfinder display and the LCD 5 for external display each display three star marks.

Then, it is judged whether or not the wide-angle side zoom switch 72b is turned off (step 618). When it is determined in step 618 that the wide-angle side zoom switch 72b is turned on, the process returns to step 606, and steps 606 and thereafter are executed again. When it is determined in step 618 that the wide-angle side zoom switch 72b is turned off, the zoom motor 11 is stopped (step 61).
9). This is the end of this program.

When zooming (pseudo zooming) by the trimming zoom means is performed, the image in the trimming area is enlarged at the time of printing, so that the image quality fluctuates greatly. Therefore, if zooming is performed randomly, the image is moved to the telephoto side. Although the image quality may be extremely deteriorated due to excessive zooming, according to the camera 1A of the present invention, when the image quality due to the particle size of the print image exceeds the allowable range during zooming to the telephoto side, Since zooming to the telephoto side is prohibited, it is possible to prevent photography of coarse grain images (coarse grain photos), and thus high-quality photos (printed images).
Can be obtained.

Further, in the camera 1A of the present invention, the image quality information (particle size γ,
.gamma. '), the image quality of the print image is judged, and the result is determined by the sound producing means 76 and the LC for display in the finder.
D6 and the LCD 5 for external display provide the respective notifications, so that the photographer can perceive the degree of image quality due to the particle size of the print image by hearing or sight.

That is, in zooming to the telephoto side, if the image quality is initially within the allowable range, zooming to the telephoto side is prohibited when the image quality exceeds the allowable range. In zooming to the telephoto side and the wide-angle side, if the image quality exceeds the allowable range from the beginning, the degree of the image quality can be grasped by the notification by the notification means (the number of displayed stars, etc.). For example, it is possible to prevent coarse grain photography from being taken by zooming to the wide-angle side until the image quality falls within the allowable range.

In the camera 1A, the image quality judgment result of the print image based on the image quality information is magnetically recorded on the magnetic track 101 of the film 100 by the magnetic head 12, so that the image is printed from the film 100 onto the photographic paper 110. At that time, the information can be used. For example, when it is recorded that the image quality of the print image is poor, the image quality can be improved by printing as it is or by changing the final enlargement magnification (trimming magnification S, print screen format, photographic paper size, etc.). It is possible to select whether or not to print, and when changing the enlargement magnification, it is possible to obtain a print image with high image quality.

In this camera 1A, the photographer inputs the allowable particle size γ _max . In addition to this, for example, the allowable particle size γ _max is set in advance at the time of factory shipment of the camera. You may

Next, recording of trimming information and image quality judgment results at the time of shooting and trimming at the time of printing will be described. As described above, when the first step of the release switch 71 is turned on, the photometry means 75 and the distance measurement means 76.
Respectively, and the release switch 71 2
When the step is turned on, the shutter is driven by the shutter driving means 26 to take an image.

When the photographing is completed, the film 100 is set to 1
It is wound up by a frame. Then, the trimming magnification S and other information relating to the photographed image, which is detected in advance by the zoom code plate 81 and the zoom code contact piece 85, is recorded on the magnetic track 101 of the film 100 by the magnetic head 12 during the film traveling. To be done.

When the film 100 is taken out from the loading section of the camera 1A and developed, and when printing is performed from the film 100 onto the photographic paper, the predetermined information reading device prints from the magnetic track 101 of the film 100. Each information such as a print screen format, a desired print size (printing paper size), a trimming magnification S, and an image quality determination result regarding the image to be read is read. And
Based on the read information, the printing paper is selected from service size, cabinet size, 6-cut, 4-cut, half-cut, all-paper, and the like.

Next, the developed film 100 and the printing paper are set in a predetermined printing device, and printing is performed in accordance with the read print screen format and trimming magnification S.

Specifically, as shown in FIG. 8, a film corresponding to an actual visual field screen (shown by a dotted line) visually recognized by the finder optical system 4 among the frames (photographing screen) 103 of the developed film 100. Screen area 104 on 100
The image is enlarged based on the trimming magnification S and printed on the screen 111 of the photographic printing paper 110.

In this case, the center of the frame 103 of the film 100 and the center of the screen area 104 on the film 100 corresponding to the actual view screen viewed by the finder optical system 4 coincide with each other, so that the trimming magnification is increased. From only S, the screen area 104 on the film 100 corresponding to the actual view screen visually recognized by the finder optical system 4 can be specified.

Next, a second embodiment of the camera of the present invention will be described. FIG. 12 is a block diagram showing a second embodiment of the camera of the present invention. Hereinafter, description of the common points with the above-described camera 1A will be omitted, and the different points will be described. Camera 1
The structure of B is the same as that of the camera 1A shown in FIGS. 1 to 7, and the circuit configuration of the camera 1B is replaced by the allowable particle size input means 14 of the camera 1A as shown in FIG.
The camera is the same as the camera 1A except that the permissible circle of confusion input means 15 is provided.

The contact points of the mode selection button 77 are the desired print size input means 18 and the permissible circle of confusion input means 15.
The mode selection button 77
By operating, the desired print size (printing paper size), the size of the permissible circle of confusion, and the like can be input.

The permissible circle of confusion input means 15 is used for the film 10
This is a means for inputting the size (diameter) of the permissible circle of confusion in the print image when printed from 0 to the photographic paper 110. From the permissible circle of confusion input means 15, a signal corresponding to the diameter δ _max of the permissible circle of confusion determined by the photographer is input to the control means 10. The permissible circle of confusion diameter δ _max is, as will be described later, a print image. It is used as information indicating the allowable range (boundary value) of the image quality of.

Next, the operation of the control means 10 during zooming will be described. [Zooming from the wide-angle side to the telephoto side] The control means (image quality information creating means) 10 has its arithmetic section to operate the film 1
The image quality information indicating the degree of image quality of the print image when printed on the photographic paper 110 from 00 is created. That is, from the film 100 to the photographic paper 110 based on the trimming magnification S ₃ (≧ 1), the diameter δ ₀ of the permissible circle of confusion on the film 100, the print screen format, the desired print size, and the exposure information (for example, F number). The radius δ of the circle of confusion in the printed image when printed is calculated.

Then, based on the created image quality information, it is judged whether or not the image quality of the print image is within the allowable range, and if it exceeds the allowable range, zooming to the telephoto side (increase of magnification of the finder optical system 4). Is prohibited (stopped) and a notification that the allowable range is exceeded is issued. That is, whether the diameter of the circle of confusion δ is less than or equal to the diameter δ _max of the permissible circle of confusion input from the permissible circle of confusion input means 15 (whether the permissible circle of confusion (δ _max ) ≧ the circle of confusion (δ) or not). ), And if δ _max <δ, zooming to the telephoto side is prohibited, and the sounding means 76,
LCD 6 for viewfinder display and L for external display
The CD 5 (notifying means) determines the image quality determination result (δ _max <δ
Is notified).

The "circle of confusion" refers to a circle of a blur of an image of an object point by an optical system. The smaller the diameter of the circle of confusion is, the sharper the focus is recognized with the naked eye, and the diameter is not so large. When it gets bigger, it becomes out of focus. A circle having a critical diameter between this blur and sharpness is called the "allowable circle of confusion".

Further, in order to inform the degree of image quality of the print image under the present conditions in more detail, when δ _max <δ, the confusion circle diameter (δ) is further set to a value (β) larger than 1. The reduced value (δ / β) is the permissible circle of confusion input means 1
It is determined whether or not it is equal to or less than the permissible circle of confusion (δ _max ) input from 5 (whether δ _max ≧ δ / β), and the image quality determination result is notified. Hereinafter, a specific description will be given.

FIG. 13 is a flow chart showing the operation of the control means 10 during zooming to the telephoto side when the zoom prohibition canceling switch 78 is off. Hereinafter, description will be given based on this flowchart.

When the telephoto side zoom switch 72a is turned on, it is judged whether or not it is the telephoto end 462 based on the signals inputted from the code plate 81 and the code connecting piece 85 (step 701). When it is determined in step 701 that it is not the telephoto end 462, the photometric means 75 is activated (step 702).

Next, the exposure calculation is performed based on the photometric information from the photometric means 75, whereby the shutter speed and F
The number (F value) F is calculated (step 703). Next, the print screen format is read (step 704). Next, the desired print size is read (step 705). Next, the zoom motor 11 is rotationally driven (normal rotation) clockwise in FIG. 2 (step 706).

Next, the cord plate 81 and the cord contact piece 8
The trimming magnification S ₃ is specified on the basis of the signal input from 5 and the trimming magnification S ₃ is read (step 7).
07).

Next, the permissible circle of confusion diameter δ ₀ on the film 100, the open F value F _{0 of} the photographing optical system 30, and the photographing optical system 30.
Film 1 based on the F value F, print screen format, desired print size and trimming magnification S _3.
A circle of confusion δ in the printed image when printed on the printing paper 110 from 00 is obtained (step 708).

Here, as shown in Tables 4 and 5 below, the print screen format and the desired print size correspond to the coefficients δ ₁ and δ ₂ , respectively. Calculate δ. This tabulated information is stored in advance in a memory (not shown) of the control means 10.

[0132]

[Table 4]

[0133]

[Table 5]

The control means 10 reads the coefficients δ ₁ and δ ₂ corresponding to the read print screen format and desired print size from the memory, respectively, and the respective coefficients δ ₁ and δ ₂ and the read trimming magnification S. Substituting ₃ and the calculated F value (F) into the following equation (3), the confusion circle diameter δ is calculated. The permissible circle of confusion diameter δ ₀ on the film 100 in the following formula (3) is set in advance at the time of factory shipment of the camera. δ = δ ₀ × (F ₀ / F) × δ ₁ × δ ₂ × S ₃ (3)

For example, the permissible circle of confusion diameter δ ₀ on the film 100 is 35 μm, the open F value F ₀ is 3.5, the F value is 3.5, the print screen format is high definition size, and the desired print size is cabinet size. , When the trimming magnification S ₃ is 1.5 times, δ ₀ = 35 μm, F ₀ =
3.5, F = 3.5, δ ₁ = 1, δ ₂ = 2, S ₃ = 1.
5 is substituted into the above equation (3), and it is calculated. The results are as follows. δ = δ ₀ × (F ₀ / F) × δ ₁ × δ ₂ × S ₃ = 35 μm × (3.5 / 3.5) × 1 × 2 × 1.5 = 105 μm

Next, the permissible circle of confusion diameter δ _max input by the photographer in advance is read, and it is determined whether δ _max ≧ δ (step 709). For example, δ _max = 60μ
If m, then δ _max <δ, so “N” is selected in step 607.

If δ _max ≧ δ is determined in step 709, no warning is given. That is, the sound producing means 7
6 does not emit a buzzer sound and is an LCD for display in the viewfinder
6 and the LCD 5 for external display do not display a star mark, respectively. Then, based on the signals inputted from the cord plate 81 and the cord contact piece 85, it is judged whether or not it is the telephoto end 462 (step 710).

If it is determined in step 710 that the telephoto end 462 is not set, the telephoto side zoom switch 72a is set.
It is determined whether or not is turned off (step 711). When it is determined in step 711 that the telephoto side zoom switch 72a is turned on, the process returns to step 707,
Steps 707 to 711 are executed again, and step 711
When it is determined that the telephoto side zoom switch 72a has been turned off at, the zoom motor 11 is stopped (step 712).

In step 710, the telephoto end 46
If it is determined to be 2, the zoom motor 11 is stopped (step 712). In step 709, δ
If it is determined that _max <δ, the zoom motor 11 is forcibly stopped, thereby prohibiting (stopping) zooming to the telephoto side (step 713). For example, in the case of already [delta] _max <[delta] when the telephoto side zoom switch 72a is turned ON, the zoom motor 11 is not driven from the beginning, when a in the middle of zooming [delta] _max <[delta] is the zoom motor 11 , Δ _max <δ, the drive is forcibly stopped.

Then, it is judged whether or not δ _max ≧ δ / 1.5 (step 714). Δ in step 714
When it is determined that _max ≧ δ / 1.5, a warning of level 1 indicating that the image quality is the best among the warnings of three stages of levels 1, 2, and 3 is issued (step 715). That is, the sounding means 76 emits a small buzzer sound of large, medium and small, and the LCD 6 for displaying in the finder and the LCD 5 for displaying externally each display one star.

Next, it is judged whether or not the telephoto side zoom switch 72a is turned off (step 716). When it is determined in step 716 that the telephoto side zoom switch 72a is turned on, the process returns to step 715 and the warning is continued until it is determined in step 716 that the telephoto side zoom switch 72a is turned off.

In step 714, δ _max <δ
If it is determined that /1.5 is, δ _{ma x} ≧ δ / 2 determines whether or not (step 717). If it is determined in step 717 that δ _max ≧ δ / 2, a warning of level 2 indicating an intermediate image quality among levels 1 to 3 is issued (step 7).
18). That is, the sounding means 76 emits a middle buzzer sound, and the LCD 6 for display in the finder and the LCD 5 for external display respectively display two star marks.

Then, it is judged whether or not the telephoto side zoom switch 72a is turned off (step 719). If it is determined in step 719 that the telephoto side zoom switch 72a is on, the process returns to step 718, and the warning is continued until it is determined in step 719 that the telephoto side zoom switch 72a is turned off.

In step 717, δ _max <δ
If it is determined to be / 2, a warning of level 3 indicating that the image quality is the worst out of levels 1 to 3 is issued (step 72
0). That is, the sounding means 76 emits a large buzzer sound, and the LCD 6 for in-viewfinder display and the LCD 5 for external display each display three star marks.

Then, it is judged whether or not the telephoto side zoom switch 72a is turned off (step 721). When it is determined in step 721 that the telephoto side zoom switch 72a is turned on, the process returns to step 720 and the warning is continued until it is determined in step 721 that the telephoto side zoom switch 72a is turned off. This is the end of this program.

As described above, this program is for the case where the zoom prohibition canceling switch 78 is turned off. When the zoom prohibition canceling switch 78 is turned on, the "zoom motor of step 713" is selected. The "stop" action is omitted. That is, even if it is determined in step 709 that δ _max <δ, the zoom motor 11 is not forcibly stopped (zooming to the telephoto side is prohibited) based on the determination.

[Zooming from the telephoto side to the wide-angle side] The control means (image quality information creating means) 10 controls the film 100 to the photographic paper 110 as in the case of the zooming to the telephoto side.
The diameter δ ′ of the circle of confusion in the printed image is obtained as the image quality information indicating the degree of the image quality of the printed image when printed on.

Whether or not the diameter of confusion circle δ ′ is less than or equal to the diameter δ _max of the permissible circle of confusion inputted from the permissible circle of confusion input means 15, that is, the permissible circle of confusion diameter (δ _max ) ≧ circle of confusion circle It is determined whether or not (δ ′). Zooming to the wide-angle side is allowed regardless of this judgment result. Also, δ
_{If max} <δ ′, the sounding means 76, the LCD 6 for display in the finder and the LCD 5 (informing means) for external display inform the image quality determination result (to the effect that δ _max <δ ′).

Further, in order to inform the image quality of the printed image in more detail, when δ _max <δ ', the circle of confusion (δ') is further decreased by a value (β) larger than 1. Whether the value (δ ′ / β) is less than or equal to the permissible circle of confusion (δ _max ) input from the permissible circle of confusion input means 15, that is, δ
_It is determined whether _max ≧ δ ′ / β, and the image quality determination result is notified. Hereinafter, a specific description will be given.

FIG. 14 is a flow chart showing the operation of the control means 10 during zooming to the wide angle side. Hereinafter, description will be given based on this flowchart. When the wide-angle side zoom switch 72b is turned on, the wide-angle end 461 is detected based on the signals input from the cord plate 81 and the cord contact piece 85.
It is determined whether or not (step 801).

When it is determined in step 801 that the wide-angle end 461 is not set, the photometric means 75 is activated (step 802). Next, the exposure calculation is performed based on the photometric information from the photometric means 75, and the shutter speed and the F number (F value) F ′ are thereby calculated (step 80).
3).

Next, the print screen format is read (step 804). Next, the desired print size is read (step 805). Next, the zoom motor 11 is rotationally driven (reverse rotation) in the counterclockwise direction in FIG. 2 (step 806).

Next, the cord plate 81 and the cord contact piece 8
The trimming magnification S ₄ is specified on the basis of the signal input from 5 and the trimming magnification S ₄ is read (step 8).
07).

Next, the permissible circle of confusion diameter δ ₀ on the film 100, the open F value F _{0 of} the photographing optical system 30, and the photographing optical system 30.
Based on the F value F ′, the print screen format, the desired print size, and the trimming magnification S ₄ , the confusion circle diameter δ ′ in the print image printed from the film 100 to the photographic paper 110 is obtained (step 80).
8).

In this case, as in the case of zooming to the telephoto side, the control means 10 controls the coefficients δ ₁ and δ ₂ corresponding to the read print screen format and the desired print size shown in Tables 1 and 2 below. Respectively,
Read from memory and its respective coefficients δ ₁ and δ ₂ ,
The read trimming magnification S ₄ and the calculated F value (F ′) are substituted into the following equation (4) to calculate the circle of confusion diameter δ ′. δ ′ = δ ₀ × (F ₀ / F ′) × δ ₁ × δ ₂ × S ₄ (4)

Next, the permissible circle of confusion diameter δ _max input by the photographer in advance is read, and it is determined whether δ _max ≧ δ '(step 809). If δ _max ≧ δ ′ is determined in step 809, no warning is given.
That is, the sounding means 76 does not emit a buzzer sound, and the LCD 6 for displaying in the finder and the LCD 5 for displaying externally.
Does not display a star, respectively. And the code plate 81
And based on the signal input from the cord contact piece 85,
It is determined whether or not it is the wide-angle end 461 (step 809).

If it is determined in step 809 that the wide-angle end 461 is not set, the wide-angle side zoom switch 72b is displayed.
It is determined whether or not is turned off (step 811). When it is determined in step 811 that the wide-angle side zoom switch 72b is turned on, the process returns to step 807,
Steps 807 to 811 are executed again, and step 811
When it is determined that the wide-angle side zoom switch 72b has been turned off in, the zoom motor 11 is stopped (step 820).

Further, in step 810, the wide-angle end 46
If it is determined to be 1, the zoom motor 11 is stopped (step 820). In step 809, δ
When it is judged that _max <δ ', δ _max ≥δ' / 1.5
It is determined whether or not (step 812).

At step 812, δ _max ≧ δ '/
If judged to be 1.5, level 1, 2 and 3 of 3
A level 1 warning indicating that the image quality is the best among the stepwise warnings is issued (step 813). That is, the sounding means 76 emits a small buzzer sound among large, medium and small,
LCD 6 for viewfinder display and L for external display
Each CD5 displays one star.

Then, it is judged whether or not the wide-angle side zoom switch 72b is turned off (step 814). If it is determined in step 814 that the wide-angle side zoom switch 72b is turned on, the process returns to step 807, and steps 807 and thereafter are executed again. When it is determined in step 814 that the wide-angle side zoom switch 72b is turned off, the zoom motor 11 is stopped (step 82).
0).

In step 812, δ _max <
When it is determined that δ ′ / 1.5, it is determined whether δ _max ≧ δ ′ / 2 (step 815). If it is determined in step 815 that δ _max ≧ δ ′ / 2, level 1
A warning of level 2 indicating an intermediate image quality out of 3 to 3 is issued (step 816). That is, the sounding means 76 emits a middle buzzer sound, and the LCD 6 for display in the finder and the LCD 5 for external display respectively display two star marks.

Then, it is judged whether or not the wide-angle side zoom switch 72b is turned off (step 817). If it is determined in step 817 that the wide-angle side zoom switch 72b is turned on, the process returns to step 807 and steps 807 and thereafter are executed again. When it is determined in step 817 that the wide-angle side zoom switch 72b is turned off, the zoom motor 11 is stopped (step 82).
0).

In step 815, δ _max <
If δ ′ / 2 is determined, a warning of level 3 indicating that the image quality is the worst out of levels 1 to 3 is issued (step 8).
18). That is, the sounding means 76 emits a large buzzer sound, and the LCD 6 for in-viewfinder display and the LCD 5 for external display each display three star marks.

Then, it is determined whether or not the wide-angle side zoom switch 72b is turned off (step 819). When it is determined in step 819 that the wide-angle side zoom switch 72b is turned on, the process returns to step 807 and steps 807 and thereafter are executed again. When it is determined in step 819 that the wide-angle side zoom switch 72b is turned off, the zoom motor 11 is stopped (step 82).
0). This is the end of this program.

As described above, according to the camera 1B, at the time of zooming to the telephoto side, it is determined based on the circle of confusion whether or not the image quality of the print image is within the permissible range in which defocusing does not occur, and the permissible range is exceeded. In this case, zooming to the telephoto side is prohibited, so that it is possible to prevent the photography of a picture with conspicuous out-of-focus, and thus it is possible to obtain a picture (printed image) with high image quality as in the camera 1A described above.

In this camera 1B, the photographer inputs the permissible circle of confusion diameter δ _max . In addition to this, for example, the permissible circle of confusion diameter δ _max is set in advance at the factory of the camera. You may do it.

Further, although the camera 1B uses the program automatic exposure, in the case of the aperture-priority automatic exposure or the manual exposure, for example, steps 702 and 802 in the flowcharts shown in FIGS. 13 and 14.
“Metering” operation in step 703 and 803 “F”
The "value calculation" operation is omitted, and the F value preset by the photographer is input.

Next, a third embodiment of the camera of the present invention will be described. In the third embodiment, image quality information (particle size γ,
γ ′, diameter of confusion δ, δ ′, etc.) are not created, and zooming is controlled. This configuration will be described for the case where zooming is controlled based on the three factors of film ISO speed, print screen format and desired print size.

In this camera, for example, as shown in Table 6 below, when the desired print size is the service size, the ISO sensitivity of the film, the print screen format, and the upper limit of the trimming magnification S that permits zooming to the telephoto side are set. The combination of and is stored in advance in a non-volatile memory (for example, ROM) as a table. Similarly, the desired print size is the cabinet size, 6
Regarding the combination of the ISO sensitivity of the film, the print screen format, and the upper limit value of the trimming magnification S for each of the cut, cut, cut, and cut sheets,
It is stored in advance in a non-volatile memory as a table.

[0170]

[Table 6]

At the time of zooming to the telephoto side, the upper limit value of the trimming magnification S which permits zooming to the telephoto side is set based on the ISO sensitivity of the film read, the print screen format and the desired print size. The code plate 8 is read from (Table 6) and set.
The current trimming magnification S ₅ read from 1 is compared with the upper limit value of the set trimming magnification S, and when the current trimming magnification S ₅ exceeds the upper limit value, zooming to the telephoto side is prohibited ( Stop).

For example, as shown in Table 6, when the desired print size is the service size, the ISO sensitivity of the film is ISO 100, and the print screen format is the high-definition size, the upper limit of the trimming magnification S is 7. It is set to 5 times. In this case, zooming to the telephoto side, the current trimming magnification S ₅ is allowed to 7.5 times, when the current trimming magnification S ₅ exceeds 7.5 times is prohibited. As for the other combinations, similarly to the above, when the current trimming magnification S ₅ exceeds the upper limit of the trimming magnification S, zooming to the telephoto side is prohibited.

The camera of the present invention has been described above based on the illustrated configuration example, but the present invention is not limited to this. For example, in the present invention, the image quality is the trimming information (trimming magnification S), the sensitivity of the film 100 (ISO
Sensitivity), print screen format (high-definition size, 35 mm size, panorama size, etc.), print size desired by the photographer (service size, cabinet size, 6-cut, 4-cut, half-cut and full paper, etc.), exposure information (aperture, etc.) Based on at least one of the information on the distance from the camera to the subject and the focal length of the photographing optical system 30, it is determined, for example, in the same manner as each of the above-described embodiments.

[0174]

As described above, according to the camera of the present invention, when the image quality of the print image printed from the film to the photographic paper exceeds the allowable range during zooming to the telephoto side, Since zooming to the telephoto side (increase of magnification of the finder optical system) is prohibited, it is possible to prevent photography of poor quality images.

Further, when the image quality of the print image exceeds the allowable range, the photographer can perceive the degree of the image quality of the print image in the case of the configuration of notifying by the notifying means. Therefore, it is possible to take measures to improve the image quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration example of a camera of the present invention.

FIG. 2 is a perspective view showing a configuration example of trimming zoom means in the present invention.

FIG. 3 is a partial cross-sectional view showing a configuration example of a camera of the present invention.

FIG. 4 is a view showing the inside of a viewfinder of the camera of the present invention.

FIG. 5 is a diagram showing the inside of a viewfinder of the camera of the present invention.

FIG. 6 is a plan view showing a display example of an LCD for external display in the present invention.

FIG. 7 is a plan view showing a display example of an LCD for external display in the present invention.

FIG. 8 is a schematic diagram showing the correspondence between the screen area on the film and the screen on the photographic paper in the present invention.

FIG. 9 is a block diagram showing a circuit configuration example of a camera of the present invention.

FIG. 10 is a flowchart showing the operation of the control means in the present invention during zooming to the telephoto side.

FIG. 11 is a flowchart showing the operation of the control means in the present invention during zooming to the wide-angle side.

FIG. 12 is a block diagram showing a circuit configuration example of a camera of a second embodiment of the present invention.

FIG. 13 is a flowchart showing the operation of the control means in the second embodiment of the present invention during zooming to the telephoto side.

FIG. 14 is a flowchart showing the operation of the control means in the second embodiment of the present invention during zooming to the wide-angle side.

[Explanation of symbols]

 1A, 1B Camera 1a Trimming zoom means 2 Camera body 30 Photographing optical system 31 Lens barrel 4 Viewfinder optical system 41 First variable-magnification optical system lens 42 Second variable-magnification optical system lens 421 Protrusion 43 Cam plate 431 Cam groove 432 Guide Groove 433 Rack gear 441, 442 Protrusion 45 Optical axis 461 Wide-angle end 462 Telephoto end 5 LCD for external display 51 Star symbol 52 “Number” “・” “×” symbol 6 LCD for viewfinder display 60 Display area 61 Star symbol 62 “Number” “・” “×” symbol 63, 64, 65 Viewfinder screen 71 Release switch 71a Release switch 71b Photometric distance measuring switch 72 Zoom lever 72a Telephoto side zoom switch 72b Wide angle side zoom switch 73 Print screen format selection switch 74 Distance measuring Means 75 photometric hand 76 Sounding means 77 Mode selection button 78 Zoom prohibition release switch 81 Zoom code plate 85 Zoom code contact piece 9 Transmission mechanism 91 Pinion gear 10 Control means 11 Zoom motor 12 Magnetic head 13 Film running motor 14 Allowable particle size input means 15 Allowable confusion circle input Means 16 Film traveling detection means 17 ISO sensitivity detection means 171 Contact point 172 Coil spring 18 Desired print size input means 19 Photographing optical system detection means 20 Zoom control means 21 Film travel control means 22 Notification control means 23 Information recording control means 24 Aperture drive means 25 Focus drive means 26 Shutter drive means 27 Patrone loading section 28 Spool 100 Film 101 Magnetic track 102 Perforation 103 Frame 104 Screen area 110 Printing paper 1 11 screens 501 to 520 steps 601 to 619 steps 701 to 721 steps 801 to 820 steps P Patrone P1 film winding shaft

Claims (6)

[Claims] 1. A photographing optical system for forming a subject image on a film surface, a finder optical system capable of changing a magnification, a magnification changing means for changing a magnification of the finder optical system, and an operation of the magnification changing means. A camera having a control means for controlling, wherein a screen area on a film corresponding to an actual field of view visually recognized by the finder optical system is printed on a photographic paper to obtain a pseudo telescopic effect. When zooming to the telephoto side of the optical system,
A camera characterized in that, when the image quality of a print image exceeds an allowable range, the control means controls to prohibit an increase in magnification of the finder optical system. 2. The control means has an arithmetic unit for creating image quality information indicating a degree of image quality of a print image when printed on a photographic paper from a film, and zooming to a telephoto side of the finder optical system. At this time, the camera according to claim 1, wherein it is determined whether or not the image quality of the print image is within an allowable range based on the image quality information created by the calculation unit. 3. The control means, as the image quality information,
The silver particle size of the film in the printed image or the diameter of the circle of confusion in the printed image is determined.
The camera described in. 4. When the image quality of the print image exceeds an allowable range, a notification means is provided to notify that effect.
The camera according to any one of 1 to 3. 5. The image quality of the print image is desired by a photographer, trimming information specifying a screen area on the film corresponding to an actual view screen visually recognized by the finder optical system, film sensitivity, print screen format. At least one of print size, exposure information, distance from camera to subject, and focal length of the photographing optical system
The camera according to claim 1, wherein the camera is determined based on one piece of information. 6. The camera according to claim 1, further comprising recording means for recording trimming information for specifying a screen area on the film corresponding to an actual visual field screen visually recognized by the finder optical system.