JPH0534809A - camera - Google Patents

Abstract

(57) [Abstract] [Purpose] In a camera provided with a focal plane shutter mechanism in which the length in the film feeding direction becomes long, it is easy to keep the loading posture of the film loaded in this camera correct. An optical detection mechanism for optically detecting the movement of the perforation of the film is provided between the photographing screen frame of the camera and the spool chamber on the film winding side, and the film leader in a state loaded in the camera. The projection for the film guide, which is arranged on the side where the partial cutout is located and is provided in the vicinity of the optical detection mechanism, is provided along the photographing optical axis side for a long time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved camera, and more particularly to an improved film feeding mechanism for a film loaded in the camera.

[0002]

2. Description of the Related Art Conventionally, a camera having a focal plane shutter is provided in a film cartridge storage room.
Because the distance to the film take-up spool becomes longer,
When a film is loaded in this camera, there is a problem that the leading end of the film leader portion is not stable (the loaded film is likely to tilt).

This problem can be avoided in a camera equipped with a sprocket, for example, by an operator who handles the camera carefully adjusting the perforation of the film to the teeth of the sprocket, and the auto loading system is adopted. Even if the camera is used, the auto-loading operation can be surely performed if the above operation is performed.

However, not only is it generally required to improve the easiness of handling, but in a camera adopting the above-mentioned auto loading system, if the handling is not easy, the auto loading mechanism As a result of not being able to secure an appropriate operating state of the above, there may be many complaints from the side of the customer such as "cannot load the film".

Therefore, as a measure for stabilizing the attitude of such a loaded film, for example, Japanese Utility Model Laid-Open No. 62-30241 is used.
According to the issue, a projection for a film guide is provided near the center of the outer rail along the shooting screen frame (aperture) which is an essential component of a normal camera, and on the other hand, it is paired with this outer rail to provide a flat surface for the film. It has been proposed that the pressure relief plate provided for maintaining the property should be provided with a relief for this projection, and the projection should regulate the inclination of the film loaded in the camera.

[0006]

However, in the above proposal, the following problems are pointed out and the problems cannot be solved sufficiently.

One of them is that the projection is provided near the center of the outer rail along the photographing screen frame (aperture), so that this position is relatively close to the film cartridge room,
There is a problem that it is not very advantageous as a configuration for controlling the tilt of the loaded film.

Another problem is that the protrusions need to be provided in the crimping plate in correspondence with the provision of the protrusions near the center of the outer rail along the frame of the photographing screen. The function of the rail and the pressure plate, that is, the function of maintaining the flatness of the film in the portion of the photographing screen frame, is impaired by the non-engaging structure of the protrusion and the escape.

The present invention has been made for the purpose of solving such a problem, and one of the purposes is to:
In a camera where the distance from the film cartridge storage chamber to the film take-up spool is long because it is equipped with a focal plane shutter mechanism, the tilt of the loaded film becomes so large that the film loading operation is not easy. An object of the present invention is to provide a camera having a structure that can be solved by a structure that is simple and does not adversely affect the peripheral mechanism.

Another object of the present invention is to provide a camera provided with an auto loading mechanism, which is suitable for surely exhibiting the function of the mechanism, and therefore can improve the reliability of the auto loading mechanism. is there.

[0011]

In order to achieve the above object, the present inventor has completed the present invention described in the claims.

According to the present invention as described above, in the camera in which the distance from the film cartridge chamber to the spool chamber tends to be long because of having the focal plane shutter mechanism, the inclination of the loaded film can be regulated. Therefore, the reliability of the auto loading mechanism can be improved.

[0013]

1 to 12 are views showing an embodiment of the present invention.

FIG. 1 is a rear view showing a single lens reflex camera according to an embodiment of the present invention, and FIG. 2 is a horizontal sectional view of the same portion. The configuration of the camera of this example will be described below with reference to FIGS. 1 and 2.

1 is a camera body, 2 is a mirror box, 3
Is a camera mount, and an interchangeable lens (not shown) can be attached and detached. 4 is a camera outline showing the grip part,
5 is a battery chamber. Reference numeral 6 is a focal plane shutter unit, 7 is a condenser (not shown) for emitting built-in flash light, 8 is a light control sensor unit for measuring the amount of light during flash photography, and 9 is an autofocus sensor unit. Reference numeral 10 denotes a back lid, which can be opened / closed around the rotary shaft 10a. Reference numeral 11 is a crimping plate for maintaining the flatness of the film, 12 is a crimping plate spring, and the locking portion 10b
And is locked to the back cover 10. A film pressing roller 13 is held by a roller guide 14 and is rotatable about a shaft 15 held by the back cover 10, and is biased by a spring 15 in the counterclockwise direction of FIG. .. 10
A film guide c is formed integrally with the back cover 10 to prevent the film from floating. Reference numeral 17 denotes a film take-up spool, which has a first claw 17a and a second claw 17b.
Are integrally formed. Reference numeral 18 denotes a motor, which rotates the film take-up spool 17 in the counterclockwise direction through a transmission mechanism (not shown) when energized in the forward direction to perform a film winding operation. The film rewinding operation is performed via the. 1 and 2 of the drawings show a state in which a cartridge 20 is loaded, 19 is a film, 19a is a lower perforation, and 19b is an upper perforation.
Reference numeral 1 denotes a cartridge regulating member, which is attached to the camera body with screws 22.

The first claw 17a provided integrally with the film take-up spool 17 is arranged corresponding to the position of the lower perforation 19a in the normal state (the state in which the film is properly loaded in FIG. 1). The second pawl 17b is disposed slightly above the spool in the axial direction. As a result, when the leader portion of the film 19 is in the normal position, the lower perforation 19a and the first claw 17a are engaged with each other, and when the leader portion of the film 19 is raised upward, the lower perforation 1 is formed.
By engaging 9a and the second claw 17b, automatic loading becomes possible, and highly reliable film loading can be realized. The positional relationship between the above-mentioned two claws is the same as the previous proposal by the present applicant (Japanese Patent Application No. 2-22539), and detailed description thereof will be omitted. In the present embodiment, the claw shapes of the first claw 17a and the second claw 17b are made different, which will be described later in detail.

Reference numeral 23 denotes a film leading edge index, which indicates a standard of the leading edge position when the film 19 is set.

Reference numeral 1a is a photographing screen frame, 1b, 1c, 1d, 1
e is an outer rail, which is an abutting surface of the crimping plate 11,
It also regulates the position of the film. Reference numerals 1f and 1g denote inner rails, which have a predetermined gap with respect to the crimping plate 11 for restricting the focus deviation of the film 19. 1h,
Film guides 1i and 1j control the position of the film 19 together with the film guide protrusion 1o. In the film guide protrusion 1o, the guide portions 1k and 1l form a surface perpendicular to the paper surface of FIG. 1, and when the back cover 10 is closed, the film 19 is formed by the guide portion 1k.
The position is regulated. Tapered portions 1m and 1n are provided so that the film 19 can be easily corrected to a normal position according to the operation of the back cover 10 even if the film 19 floats up when the film is set.

The above film guide protrusion 1o is. Compared to the other film guides 1h, 1i, 1j, the film guides are extended to the photographing optical axis side.

Further, the pressure-bonding plate 11 is provided with a notch portion 11a as a relief of the film guide protrusion 1o. Since the notch 11a is provided at the end of the crimping plate 11 and is sufficiently away from the photographing optical axis, it does not adversely affect the film flatness guarantee in the photographing screen by the crimping plate, and the external shape. It is also honest, and the actual development is Sho 62-3024.
The performance and appearance are superior to those of the crimping plate having a notch near the frame position of the photographing screen as described in No. 1.

Next, the mechanism for detecting the amount of movement of the film 19 will be described.

Reference numeral 24 is a guide member, 25 is a cover member, and 2
Reference numeral 6 is a photo reflector, and 27 is a film guide roller, which are provided as a part of the guide member unit 40. The guide member unit 40 is engaged with the main body 1 by the engaging claws 25 and the main body 1 with the screw 28. It is fixed to. Reference numeral 25b provided in a part of the guide member unit 40 is a detection window, which is used to detect the movement of the upper perforation 19b of the film 19 by the photo reflector 26 and to detect the film feed amount. Details of the photo reflector 26 will be described later.

As shown in FIG. 2, the guide member 2 described above is used.
Reference numeral 4 includes a guide surface 24a that forms a part of the wall surface of the film winding chamber 1p of the camera body 1. In this example using the guide member 24, since the photo reflector 26 is provided in the guide member unit 40,
For example, there is an advantage that the dead space portion that cannot be used as the undercut portion in the method of integrally molding the main body 1 can be used as the portion for housing the photo reflector 26 as described above. Therefore, the film winding chamber 1p can be brought closer to the optical axis side without interfering with the drive space of the focal plane shutter unit 6, and the condenser 7 can also be arranged.

As described above, in the single-lens reflex camera of this embodiment, when the optical detection system for detecting the movement of the film is adopted, the undercut portion around the film winding chamber has conventionally been a dead space around the film winding chamber. Since the optical detection member can be arranged in the part, it has an excellent effect in making the entire camera compact.

FIG. 3 is a view for explaining the structure of the guide member unit 40, and FIG. 4 shows the structure of the photo reflector 26. 28a is a light projecting unit and 26b is a light receiving unit. 26c and 26d are leads of the light emitting element, 2
6e and 26f are leads of the light receiving element. The photo reflector 26 is arranged at a position corresponding to the upper perforation 19b of the film 19, and emits infrared light from the light emitting unit 26a toward the film when the film is fed, and receives reflected light on the film surface as a light receiving unit. It is detected at 26b. That is, the movement of the perforation is detected by utilizing the fact that the reflected light disappears when the perforation 19b portion of the film to be fed passes and the output of the light receiving portion 26b disappears. The details of the detection method will be described later.

Next, FIG. 3 will be described. Guide member 24
The cover member 25 is unitized as a guide member unit 40 with the photo reflector 26 and the film guide roller 27 sandwiched therebetween. Specifically, the positioning bosses 25f and 25g and the positioning holes 24c and 24d are fitted to each other, and the screw 29 is screwed into the self-tapping pilot hole 25h through the hole 24e to form the unit 40. The photo reflector 26 has a positioning hole 2
It is fitted in 5c and fixed by a holding member 24b. The guides 25d and 25e are steady rest members for improving assembly workability. Also, the film guide roller 27
Although 27a and 27b are rotating shafts, they are held by a bearing portion 25i and a guide portion 24f provided above and below so as not to fall off in a unit state.

The guide member unit 40 is attached to the main body 1 by positioning dowels 25j and 25k and positioning holes (not shown) provided in the main body 1, and the engaging claws 25a are attached to the engaging holes (not shown) of the main body 1. The screws 28 (see FIG. 1) are engaged and fastened to each other by tightening the screws 28 (see FIG. 1) into the self-tapping pilot holes (not shown) of the camera body 1 through the holes 25l. Lead wires 30, 31, 32, 33 in FIG. 2 are leads 26 c, 26 d, 26 e, 26 of the photo reflector 26.
Soldered to f. These lead wires 30 and 3
It is preferable that 1, 32, 33 have a slack in an internal portion (not shown) so that they can be pulled out at the time of soldering work. At the time of initial installation, the lead wires 30, 31, 32, 33 can also be installed in addition to the unit 40 shown in FIG.

Next, the film operability when the film is loaded into the camera having the above-mentioned structure will be described.

The camera of the present embodiment having the above-mentioned structure has a focal plane shutter and adopts the above-mentioned film feeding optical detecting means to achieve compactness. If the pull-out length is long, the general problem that the position of the film tip is difficult to set when setting the film is unavoidable. As a measure against such a problem, a projection for a film guide is provided near the center of the outer rail as described in Japanese Utility Model Laid-Open No. 62-30241, while a relief for the projection is provided on the crimping plate. Has proposed to regulate the shake of the film leader section. However, in this conventional example, since the position of the film guide protrusion is relatively close to the cartridge chamber, the tilt regulation of the tip of the film leader is not sufficient,
Further, it is not preferable to guarantee the flatness of the film, because the notch of the film pressure bonding plate is required close to the position of the frame of the photographing screen.

On the other hand, in this embodiment, the photo reflector 26 is arranged on the notch side of the film leader portion (the upper half portion side in FIG. 1), and the film guide protrusion 1 near the notch side.
the guide part 1k of o to the other guide protrusions 1h, 1i, 1j
A characteristic configuration was adopted in which it was extended to the optical axis side within a range that did not cover the shooting screen frame 1a. This makes it easy to set the film at a position where the film 19 is not covered on the photo reflector 26 when the film is set and the rising of the film is restricted by the guide portion 1k. In this case, the leading edge of the film 19 may move slightly back and forth with respect to the film leading edge index 23 due to variations in the length of the leader portion, but since the film feed amount is detected by the photo reflector 26, there is no problem with the film idling amount. Instead, it stops when the predetermined number of the upper perforations 19b is detected. Further, when the film is rewound once on the way and the same film is loaded again, it is possible to accurately determine the same shooting screen position as the previous time. In the state where the film 19 is set as shown in FIG. 1, since the guide portion 1k is sufficiently separated from the other guide portions 1j and 1i, the position regulation ability of the film 19 is very excellent, and the tip deflection Can be reduced, and accurate engagement between the first pawl 17a and the lower perforation 19a can be guaranteed.

FIG. 5 is a diagram showing a state in which the film is not sufficiently set (a set-mistake state) at the time of loading the film. The drawing length of the film leader portion is relatively short and the guide portion 1k of the film guide protrusion 1o. Indicates that the film 19 cannot be regulated. However, in this example, in this case, as shown in FIG.
And the lower perforation 19a can engage. Here, in this embodiment, the first claw 17a and the second claw 17a
The shapes of the claws 17b are different from each other, and the engagement of the lower perforations by the claws in such a setting error state is ensured. 6 shows the shape of the first claw 17a, and FIG. 7 shows the shape of the second claw 17b.
With respect to the ridge lines 17c and 17d of the first claw, the second claw 17
The ridgelines 17e and 17f of b are largely R-shaped (curved surfaces having a small curvature). The two-dot chain line in FIG. 7 indicates a portion where the ridge portion is continuous with the side surface (R-shaped).

FIG. 8 is a diagram showing the relationship between the first claw 17a and the lower perforation 19a, and FIG. 9 is a diagram showing the relationship between the second claw 17b and the lower perforation 19a. Here, the first claw 17a and the engaging surface 17g which are perpendicular to the film feeding direction are engaged with the engaging surface 17g so that the perforations are uniformly contacted.
The length of the is increased to reduce the surface pressure applied to the perforations, which prevents the perforations from breaking. The engaging surface 17h of the second pawl 17b, which is perpendicular to the film feeding direction, is originally the engaging surface 17h.
b is the perforation 19 when the film 19 is tilted.
Since it engages with a, the ridge line 17e has a large radius R as described above to prevent the perforation from being broken by the edge of the ridge line. The reason why the ridge line 17f also has a large R is to prevent interference with the perforation when the film 19 further rises.

With the configuration described above, the first claw 17a
By making the shapes of the second claw b different from each other, it is possible to exhibit the limit performance of preventing the perforation from being cut off. The ridge lines 17c, 1 of the first claw 17a
Although 7d is shown in the figure as having no R-riding, it goes without saying that a small R-riding may be performed. In addition, the state of FIG. 9 is for explaining the case of relieving the case where a setting error occurs when the film is loaded as described with reference to FIG. 5, and therefore the perforation may be broken compared to the state of FIG. It is natural that

FIG. 10 shows an electric control block diagram of a camera equipped with the film feeding control device of this embodiment.

In this figure, reference numeral 51 is a microcomputer (hereinafter abbreviated as "microcomputer"), which controls the movement of each part of the camera described below.

Reference numeral 52 denotes a lens control circuit, which controls the operations of the range ring and the diaphragm of the taking lens (not shown).
That is, the lens control circuit 52 performs serial communication via the DBUS while receiving the LCOM signal from the microcomputer 51, and controls a motor (not shown) by this communication content to control the range ring and the diaphragm. Also, microcomputer 5
Reference numeral 1 receives lens focal length information, distance information, and other various correction information.

Reference numeral 52 denotes a liquid crystal display circuit, which displays photographing information such as a shutter speed and an aperture control value, which is bought by the camera. This liquid crystal display circuit 53 is
While receiving the PCOM signal, serial communication is performed via DBUS, and liquid crystal display is performed according to the communication content.

Reference numeral 54 denotes a switch sense circuit, which is always supplied with power together with the liquid crystal display circuit 53, and the well-known first stroke which is interlocked with the first stroke of the release button (not shown) of the camera is the switch SW1. Other switches (not shown) for determining the exposure mode, the switch for determining the AF mode, and the like are always provided so that they can be read. When the switch is switched, the switch sense circuit 54 sends a signal to a DC / DC converter (not shown) to activate the DC / DC converter. DC /
The DC converter supplies power to other circuits including the microcomputer 51. And this switch sense circuit 5
4 performs serial communication via DBUS while receiving the SWCOM signal from the microcomputer 51, and DC / DC when receiving a DC / DC OFF command from the microcomputer 51.
Turn off the converter output. Further, the microcomputer 51 receives each switch information.

Reference numeral 55 is a strobe light emission control circuit for controlling strobe light emission and dimming, which is a circuit for storing electric charges for light emission, a xenon tube as a light emitting portion, a trigger circuit,
It consists of existing circuits such as a circuit to stop light emission, a film surface reflected light metering circuit, and an integrating circuit. The X contact is a contact that turns on when the shutter unit travels through the front curtain, and the strobe light emission control circuit 55 starts flashing of the strobe when the X contact turns on.

Reference numeral 56 denotes a focus detection unit, which is a circuit for determining to which position the subject is focused by the taking lens by the existing phase difference detection method. The microcomputer 51 drives the focus detection unit 56 to read the signal stored in the line sensor, performs AD conversion, and determines the focus state of the subject by a predetermined calculation to drive the lens distance ring and perform focus determination. ..

Reference numeral 57 is a photometry circuit, which divides the screen into a plurality of areas, performs the TTL photometry of the brightness of the subject in each area, and sends it to the microcomputer 51.

A shutter control circuit 58 controls a shutter unit (not shown) according to a control signal from the microcomputer 51.

A motor driver circuit 59 controls the film feeding motor 18 in accordance with the control signals MS1 and MS2 of the microcomputer 51 to wind and rewind the film.

The photo-reflector 26 shown in FIG. 10 is the one described in FIG. 1 and the like, and the upper perforation 19 of the film during film feeding is used.
It is arranged corresponding to the position where a passes, and when the perforation hole passes, the light from the light emitting part of the reflector does not reflect to the light receiving part, so the AD converter 6
When a low voltage is supplied to 0 and the non-perforated part of the upper perforation passes, the light from the light emitting part of the photoreflector is reflected to the light receiving part, so that a high voltage is supplied to the AD converter 60. It The AD converter 60 converts the photoelectric conversion signal from the photo reflector into a digital signal and sends it to the microcomputer 51.

Reference numeral 61 is a DA converter, which converts the digital data from the microcomputer 51 into an analog signal and sends it to the comparator 62. The comparator 62 compares the photoelectric conversion signal from the photo reflector with the signal from the DA converter 61, and outputs a comparison signal CMP.

The microcomputer 51 controls the PRS during film feeding.
The light emitting part of the photo reflector is caused to emit light by a signal, and M
The film feeding motor is started by the S1 or MS2 signal, the film feeding state is judged by the signal from the AD converter and the CMP signal, the motor is stopped by the MS1 or MS2 signal, and the predetermined perforated film is wound up, Controls rewinding.

11 to 13 are flow charts showing an operation example of the camera of the present embodiment. FIG. 11 is a flow at the time of automatic loading, FIG. 12 is a flow in the film control mode, and FIG. Shows the flow of the shooting sequence.

Description will be given below with reference to these flow charts.

First, in step 101, it is detected that the back cover is closed. The detection means is a switch (not shown).

When it is detected in step 102 that a film is loaded by a switch (not shown), in step 103, the motor 18 is energized so as to rotate in the forward direction via the motor driver 59.

In step 104, the pulse counter for measuring the moving amount of the film 19 is reset.

In step 105, the output from the AD converter 60 is monitored at minute time intervals (for example, 128 μs in this example), and when it is detected that the output has continuously changed four times in the direction of decreasing the output, step 106 is performed. Then, the pulse counter is incremented by 1. Assuming that auto-loading is started from the state shown in FIG. 1, in step 105, after the output from the AD converter 60 becomes high once, the first perforation causes
It is detected that the output has started to change in the lowering direction. The method described above makes it possible to accurately match the detection start point with the first perforation. The reason why the continuous detection is performed four times as described above is to prevent erroneous detection due to noise or the like and to perform reliable detection.

Next, the process proceeds to step 107 and step 10
The set of detection directions is reversed in the direction opposite to the direction of change of the AD value detected in 5.

In step 108, a change in the AD value in the direction set in step 107 is detected by the same detection method as in step 105. Next, in step 109, the pulse counter is incremented by 1, and if the value of the pulse counter is 29 or more in 110, the process proceeds to step 111. If the value of the pulse counter is less than 29, the process returns to step 107, and the operation is repeated until the pulse counter reaches 29. The counter value of 29 is set to avoid the unstable behavior of the film at the start of autoloading and to perform the AD value sampling after step 111 in a stable state as much as possible.

In step 111, the AD converter 60
The sampling of the AD value output from is started. In this example, the sampling interval is 128 μs as described above.

In step 112, step 105
Detect the change of AD value in the set direction by the same method as
In step 113, the pulse counter is incremented by 1. In step 114, the direction set is reversed as in step 107, and in step 115 step 1
A change in the AD value in the set direction at 14 is detected, and the pulse counter is incremented by 1 at step 116.

If the pulse counter is 39 or more in step 117, the process proceeds to step 118, and if the pulse counter is less than 39, the process returns to step 114 to repeat the operation until the pulse counter reaches 39.
Here, the counter value 39 is set to a predetermined film feed amount in automatic loading (corresponding to about 3.5 frames) in combination with the film feed for one frame in the film control mode of step 120 (flow in FIG. 12). This is to realize

In step 118, step 11
The AD value sampling started at 1 is completed. The results of AD value sampling are classified according to preset AD value levels of eight stages, and the number of data of each level is stored. This frequency distribution changes depending on the difference in the reflectance of the film.

In step 119, assuming that the total number of pieces of AD value sampling data is N, a preset eight-step A
The number of data is counted from the smaller D level, and N /
The 8-step AD value area in which the second data exists is determined as an intermediate value, and is set as the comparison signal of the comparator 62 in the film control mode in step 120.

Next, referring to FIG. 12, the flow of the film control mode will be described. In this figure, step 201
Starting with, the pulse counter is reset in step 202, and the comparator (CM
After detecting that the output of P) 62 becomes Hi, it is detected at step 203b that the output of the comparator (CMP) 62 becomes Lo. Step 119 for the DA converter 61
The intermediate value determined in step 1 is input to the microcomputer 51, the output of the DA converter 61 and the output of the photo reflector 26 are input to the comparator 62, and the output of the DA converter 61 is
When the output of the photo reflector 26 is low, a Lo signal is input, and when it is high, a Hi signal is input to the microcomputer 51 by the comparator 62. That is, in step 203b, the state in which the sensor portion of the photo reflector 26 is covered with the film 19 and the face is exposed to the upper perforation 19b portion is detected.

When it is detected in step 203b that the output of the comparator 62 has become Lo, step 204
Then, the pulse counter is incremented by 1, and then the process proceeds to step 205. When it is detected that the output of the comparator (CMP) 62 becomes Hi, step 206
The pulse counter is incremented by 1.

Next, when it is detected in step 207 that the output of the comparator 62 has become Lo, the pulse counter is incremented by 1 in step 208 and step 209
Proceed to. If the pulse counter is 15 or more in step 209, the process proceeds to 210. If the pulse counter is less than 15, the process returns to step 205 and the operation is repeated until the pulse counter reaches 15. The counter value of 15 is a numerical value set to realize the film per frame advance corresponding to 8 perforations.

In step 210, the microcomputer 51 gives a reverse energization command to the motor driver 59 to the motor 18 which is rotating forward, and the reverse energization to the motor 18 is started. In this example, the step 211 waits for 10 ms, and then the motor driver 59 waits in the step 212.
And a short-circuit command is given to the terminals of the motor 18 to short-circuit them.
In the film feeding control mode shown in FIG. 12 described above, it is possible to more accurately control the film feeding for eight perforations by starting the motor 18 after the energization of the motor 18 in the forward direction. .. For example, in the conventional proposal disclosed in Japanese Patent Laid-Open No. 57-85040, a method of optically detecting the movement of the film perforation is adopted, and as a measure for improving the accuracy of the stop position of the film, 1
Of the 8 perforations for frame feed, the film feed speed is reduced by starting deceleration from the 6th perforation to reduce the overrun due to the brake when counting 8 perforations. It has already been mentioned that the film winding time becomes longer and the continuous shooting frame speed becomes slower. Further, in the type that detects movement of perforation, the degree of feed amount detection is coarse, so there is little freedom in setting the deceleration start point, and it is difficult to set an appropriate deceleration point.

On the other hand, according to the camera of the present invention described in the above-described configuration of the present example, when the movement of the predetermined amount of perforation is detected in step 209, the motor 18 rotating in the forward direction is rotated for the predetermined time. Since a control method of energizing in the opposite direction and then short-circuiting between terminals is adopted,
The braking performance can be improved without lowering the film winding speed, and the accuracy of the film stop position can be improved.

The wait time in step 211 is preferably set within the length of the range in which the motor 18 does not start reverse rotation. Even if the motor starts to rotate in reverse due to the reverse energization time being too long, if the motor stops in the revolution area of the planetary gear, it will not switch to the film rewinding operation. There are advantages.

Next, the flow of the photographing sequence will be described with reference to FIG.

When the power switch (not shown) is turned on in step 301 of this figure, the switch sense circuit 54 detects in step 302 that SW1 is turned on by the first stroke of the shutter release button (not shown), An autofocus operation is performed in step 303, and photometry is performed in step 304. Next, when the switch sense circuit 54 detects that the SW2 is turned on by the second stroke of the shutter release button in step 305, the shutter release operation is performed in step 306, and the motor 18 is turned on through the motor driver 59 in step 307. Directional energization is started, and in step 308, the flow advances to the film control mode flow shown in FIG. 12 to wind the film by one frame.

According to the camera having the structure of the present embodiment as described above, the braking performance at the end of the one-frame winding operation is improved, which requires the control that the film winding speed is lowered at a relatively early stage in the process. It is possible to realize continuous shooting operation faster than before.

Other Embodiments FIG. 14 for explaining the present embodiment is a rear view of the camera corresponding to FIG. 1 of the above-mentioned embodiment. The difference in the configuration of the camera described in FIG. 1 is that the pressure plate 401 shown in FIG.
However, the length thereof (the length in the film feeding direction) is limited as compared with the example of FIG. It is natural that the length of the pressure bonding plate shown in the example of FIG. 14 is set to the minimum degree necessary to secure the flatness of the film in the photographing screen frame.

According to such a structure, as shown in FIG. 14, since the crimping plate 401 can be formed into a simple rectangle, there is an advantage that the degree of freedom in manufacturing is increased.

[0071]

As described above, since the camera of the present invention is provided with the focal plane shutter mechanism, the loaded film is easily tilted in a camera having a long distance from the film cartridge storage chamber to the film take-up spool. There is an effect that such a problem can be suppressed by a simple structure while maintaining the flatness of the film without adversely affecting the peripheral mechanism.

Further, since the projection for the film guide is extended to the photoreflector portion on the side of the photographing optical axis so as not to cover the photographing screen, there is no film on the photoreflector at the time of film setting, and the film guide The projections make it easier to set the film at the position where the film is restricted from rising, and ensure a reliable film feed during auto loading and a reproducible and accurate film feed amount during reloading. effective.

[Brief description of drawings]

FIG. 1 is a rear view showing a schematic configuration of a camera according to an embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the same.

FIG. 3 is a component development view illustrating the configuration of the guide member unit.

FIG. 4 is a diagram showing a configuration of the photo reflector.

FIG. 5 is a diagram for explaining a setting error state when the film is loaded.

FIG. 6 is a perspective view illustrating the shape of a first claw.

FIG. 7 is a perspective view illustrating the shape of a second claw.

FIG. 8 is a diagram for explaining a relationship between a first claw and a lower perforation.

FIG. 9 is a diagram for explaining a relationship between a second claw and a lower perforation.

FIG. 10 is a block diagram of electrical control in the camera of the present embodiment.

FIG. 11 is a view showing a flow at the time of auto loading in the same embodiment.

FIG. 12 is a view showing a flow of film control mode in the embodiment.

FIG. 13 is a diagram showing a flow of a shooting sequence in the embodiment.

FIG. 14 is a rear view of a camera of another embodiment of the present invention.

[Explanation of symbols]

1: Camera body (main body), 2: Mirror box, 3: Camera mount, 5: Battery compartment, 6: Focal plane shutter unit, 7: Condenser for built-in flash emission, 10: Back cover, 11: Crimping plate 12: Crimping plate Leaf spring, 13: film pressing roller, 14:
Roller guide, 15: Shaft 16: Spring, 17: Film take-up spool, 17a: First claw, 17b: Second claw,
18: Motor, 19: Film, 19a: Lower Perforation, 19b: Upper Perforation, 2
0: Patrone, 21: Patrone regulating member, 22: Screw, 23: Film tip index, 24: Guide member, 2
6: Photoreflector, 26a: Light emitting part, 26b: Light receiving part, 27: Film guide roller, 28: Screw, 2
9: Screw 30 to 33: Lead wire.

Claims (1)

Claims: 1. A focal plane shutter mechanism,
In a camera provided with an optical detection mechanism for optically detecting the movement of the perforation of the film, the optical detection mechanism is provided between the photographing screen frame of the camera and the spool chamber on the film winding side, and It is characterized in that it is arranged on the side where the leader notch of the loaded film is located, and that a film guide protrusion provided near this optical detection mechanism is provided along the photographing optical axis side for a long time. camera.