JPH0572676A - Camera - Google Patents

Abstract

(57) [Abstract] [Purpose] If the number of unexposed frames is less than the specified number in a camera that can rewind film halfway,
The display means of the film cartridge is switched to "all frames exposed". [Structure] Regarding a film, information is read from a display member 82 and a magnetic recording section 83. This information is discriminated by the discriminating means 86, and in the case of the unexposed film, the control means 87 feeds the film to the leading frame, and in the case of the film taken out in the middle, the film is fed to the leading frame of the unexposed frame. Further, the photographing execution means executes the photographing operation on the film exposed surface, and controls the unexposed frame counter 89 each time. The comparison means 90 compares the value of this counter with a constant value, and the display switching means 81 switches the display member according to the result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a film cartridge which is housed in a film cartridge and has a display means for displaying the usage status of the film.

[0002]

2. Description of the Related Art Conventionally, a camera using a film cartridge having a display means for displaying the usage status of the film is described in US Pat. No. 4,965,600.
This patent has a display switching means for switching the display means of the film cartridge, and after the film rewinding is completed, the display switching means is used to display the film cartridge when the state of use of the film is not exposed by the switching means. The means is displayed as "all frames unexposed", and when all frames have been exposed, the display means is displayed as "all frames exposed", and some of the frames have been exposed and unexposed. In the case where the remaining number remains, the display means is configured to display "only some frames have been exposed".

Further, according to US Pat. No. 4,947,197, in order to make the display switching means simple, the indication "all frames not exposed" of the film cartridge is not used but "all frames not exposed". It was configured to use only two displays, "" and "all exposed".

[0004]

However, in the latter of the above-mentioned conventional examples, even if the number of exposed frames is one,
Since the display means of the film cartridge is displayed as "all frames exposed", it becomes impossible to distinguish from the film cartridge in which all frames have been exposed and "all frames have been exposed". However, there is a drawback in that the film cartridge having almost unexposed frames cannot be loaded into the camera again and used, and all the remaining unexposed frames are wasted.

Further, in the former case of the above-mentioned conventional example, even if there is only one unexposed frame, the display means of the film cartridge displays "only some frames have been exposed", so that the user In order to shoot an unexposed frame of the film cartridge, the film cartridge is reloaded into the camera. However, in order to shoot an unexposed frame, the film must be fed until the unexposed frame faces the aperture of the camera, which is necessary to shoot one frame or only a few frames. The time was so long that I could miss a photo opportunity. Also, if you need to shoot multiple frames, if you load the camera with a film cartridge that says "Only some frames have been exposed", where only the unexposed frames below the required multiple frames remain, Not only will it take a long time to complete, but all the unexposed frames will be taken before the required number of frames have been taken, and all frames have already been taken. The film cartridge of No. 1 has to be loaded, and there is a problem that the configuration becomes very troublesome for the user.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is troublesome to repeat film winding and rewinding by loading a film cartridge having few unexposed frames, and a shutter chance. The objective is to provide a camera that will not be missed.

[0007]

In order to achieve the above object, in the camera of the present invention, in claim 1, the number of unexposed frames is at least one frame and not more than a predetermined frame number. In this case, the display switching means causes the display means to display that all frames have been exposed. In claim 2, a releasing means for setting the predetermined number of frames to 0 is provided. According to a third aspect of the present invention, a frame number input means for inputting an arbitrary number of frames and a storage means for recording the number of frames inputted by the frame number input means are provided, and the number of unexposed frames is stored. When the number is less than the number, the display switching means displays the display means of the film cartridge to indicate that all frames have been exposed. Further, in claim 4, the midway rewinding means performs midway rewinding. If the display switching means, The film cartridge has a selection means capable of selectively switching the display means to only one frame exposed or all frames exposed. Further, in claim 5, the rewinding is completed. After that, a display means for displaying the number of unexposed frames is provided.

[0008]

According to the present invention, when the number of unexposed frames is at least one and is less than the predetermined number, the display switching means causes the display means of the film cartridge to display "all frames exposed". By doing so, it is possible to prevent the film cartridge with a few unexposed frames remaining from being reloaded into the camera, so that you cannot miss a photo opportunity, load the film, wind the film, or rewind the film. It is possible to eliminate bothersomeness caused by repeating and damage to the film due to winding and rewinding.

Furthermore, since the number of frames can be entered according to the way of thinking of the person who uses the camera, it is possible to provide a camera that is very easy for the person who uses the camera. In the past, it was possible to load the film and rewind halfway as many times as long as there was still one unexposed frame. However, if the number of frames increases, the film surface will have numerous flaws. There was a possibility that it would end up. However, if the selection means according to the present invention is provided, the display means of the film cartridge is "exposed" even if there are unexposed frames.
Since it is possible to display, it is possible to prevent the film surface from being scratched by reloading the film cartridge into the camera and feeding it.

[0010]

1 to 8 are views showing a first embodiment of the present invention. In FIG. 1, 1 is a microprocessor that controls the entire camera, 2 is a photometric circuit, 3 is a distance measuring circuit,
Reference numeral 4 is a shutter control circuit, 5 is an aperture control circuit, and 2 to 5 are constructed as known circuits. 6 is a metering / distance measurement start switch (sw1), 7 is an exposure start switch (sw)
In 2), this is a switch that is turned on in the first stroke and the second stroke of the release button, respectively. Reference numeral 8 is a main switch, 9 is a magnetic recording circuit, 10 is a magnetic head, 11 is a rewind start button, 13 is a display circuit for giving a shutter speed, an aperture value, a film patrone presence / absence, a film removal warning, and the like. Is a back lid switch for knowing the open / closed state of the back lid, 15 is a motor drive circuit for feeding the film 16, and 17 is a film cartridge known in US Pat. Is included in the display member. 18 is U.S. Pat. Nos. 4,965,600 and 4947.
A known switching means for switching the display member of the known film cartridge No. 197, in which the display member is rotationally driven by a driving means such as a motor, is considered. A reading unit 19 reads the display member of the film cartridge. Although not shown, this display member is, for example, a disk on which information about a film that rotates integrally with the spool is recorded by a bar code.

Next, the operation of the microprocessor 1 will be described with reference to the flowcharts of FIGS.

FIG. 2 is a flow chart showing the state of auto loading in the prewind camera.

First, the display member of the film cartridge is read, and in step 201 (S201), it is judged whether or not the result of reading the display means has been exposed for all frames (S).
202). When it is determined that all frames have been exposed, a warning is given by blinking the display or the like (S203), and the process ends.
In addition, in S202, it is determined that all frames have not been exposed,
In addition, if it is determined in S204 that it is partially exposed, S205 to S214 are executed as described in detail below, and if it is determined that it is not partially exposed, it is determined that it is not exposed. , S215-217 are executed.

Therefore, some frames of the film have been exposed (S
If it is determined that the number of exposed frames is 204, it is first searched until the first frame is detected (S205), and while one frame is fed (S206), unexposed frames are detected (S207). This loop continues as long as is detected. In step 208, the counter for counting the number of unexposed frames is set to 1. In steps 209 to 211, one frame feeding (S209) is repeated until the exposed frame is detected, the feeding is continued, and it is determined whether or not the frame is exposed (S21).
0). During that time, the counter L is incremented by 1 each time one frame is detected (S211). When an exposed frame is detected,
One frame is rewound (S212) to return to the unexposed first frame. Next, since one frame has been rewound (S212), the counter L is decremented by 1, and this value is substituted for the unexposed frame number N in step 214.

If all the frames have not been exposed, that is, if the film has not been exposed, first, the number of films is read and this value is set to F (S215). Next, the film is wound up to the last frame (S216), and the number of unexposed frames N
F is substituted into (S217). Thereafter, if necessary, the number of unexposed frames is displayed on the display means 31 via the display circuit 13 (S218).

3 and 4 are flowcharts showing the main routine of the camera shown in FIG. When the main switch is in the off position, the other switches are not accepted, and when it is in the on position, the process proceeds from S401 to S402. If the autoloading is to be performed, the autoloading routine shown in FIG. 2 is executed. First, it is determined whether or not the rewind button is pressed (S40
2) If yes, go to S416. If not pressed, it is determined whether the photometry / distance measurement start switch (sw1) 6 is on or off (S403).
As a result, if it is off, the process returns to S401, and if it is on, the process proceeds to S404 and thereafter. Then, the photometric circuit 2 is used to obtain a photometric value, and the photometric value is A / D converted (S
404) and S405, in which the TV (shutter time) and AV (aperture) values are determined based on a program diagram (not shown) in the microprocessor 1. Next, the distance measuring circuit 3 is used to obtain distance measuring information (S406), and the lens is driven based on the distance measuring information (S407). After that, when the exposure start switch (sw2) 7 is turned on, the shutter control circuit 4 and the aperture control circuit 5 are operated, and S
(409) After exposing the film, information indicating that the image has been taken is recorded in the magnetic recording portion of the film by the magnetic head 10 (S410). Next, the number of unexposed frames N
Judgment is made (S411), and the number of frames recorded as already photographed is N
= 1, that is, in the case of the last unexposed frame, the process proceeds to S415. If the frame written as “photographed” is not the final frame, that is, if N = 1, N is decremented by 1 (S41).
2) Further, the film is fed in the rewinding direction by one frame (S413). It is judged whether or not the frame after feeding one frame has been exposed (S414). Normally, the case of coming to S414 is only for the case of unexposed frame, but it is a step in case of emergency. Then, since there is usually unexposed light, the process returns to step 401. If the frame written as “photographed” is the last unexposed frame, N = Ф
After that, the rewinding routine is entered. That is, in this case and when the rewind button is pressed in S402,
The film is wound and waits until it is completed (S41
6). After that, the display members to be described later are switched (S41).
7). After the rewinding is completed, a warning is issued by flashing the film mark to prompt the camera to take out the film (S418), and waits for the back cover of the camera to be opened (S418).
419).

FIG. 5 is a flow chart showing the switching of the display member which is the display means of the film use state. Here, a fixed value larger than 1 is used as the predetermined number of frames, and assuming that the number of unexposed frames is N and the number of predetermined frames is K (S501), whether the number of unexposed frames is 0 or not. (S502), if N = 0, and the number of unexposed frames N
And a predetermined number of frames K are compared (S503), and if N ≦ K, the display member is switched to the position where all frames have been exposed in step 504. If the number of unexposed frames is not equal to the predetermined number of frames, N and K are compared (S503), and if N> K, the display member is switched to the partially exposed position.

FIG. 6 shows a film with a magnetic recording portion used in an embodiment of the present invention.

FIG. 6A is a diagram showing an unexposed film, and FIG. 6B is a diagram showing an exposed film. 7 (a), (b), and (c) are views showing a partially exposed film, and FIG. 7 (a) shows a film which was taken out halfway after being photographed by a normal wind camera. Figure (b) shows the film taken out with the prewind camera and then taken out halfway. Figure (c) shows the film taken with the normal wind camera, taken out once, and then taken again with the prewind camera and taken out halfway. FIG. 6 is a diagram showing an exposure state of each frame in a film that has been taken out, or the reverse, after taking a picture with a prewind camera, taking out once, then taking a picture again with a normal wind camera, and taking out halfway.

Incidentally, in FIG. 7, the shaded pieces indicate that they are exposed pieces.

FIG. 8 is a block diagram showing the operation of one embodiment of the present invention. The film used in the present invention is housed in a film cartridge having a display member for displaying the exposure state, and the surface of the film is composed of a magnetic recording section and a film exposure surface. Regarding the film, information is read from a display member 82 (not shown) provided in the film cartridge and a magnetic recording unit 83. This information is discriminated by the discriminating means 87, and in the case of the unexposed film, the film is fed to the leading frame, and in the case of the film taken out in the middle, the film is fed by the controlling means 87 to the leading frame of the unexposed frame. Further, the photographing execution means executes the photographing operation on the film exposed surface, and controls the unexposed frame counter 89 each time.

In the first embodiment of the present invention, the comparison means 90 compares the value of the unexposed frame counter 89 with a fixed value, and the display switching means 81 switches the display member based on the result. ..

FIG. 9 is a flow chart showing the state of the auto loading in the normal wind camera as the second embodiment of the present invention.

First, a display member (not shown) provided in the film cartridge is read (S301), the display means is judged, and as a result of the reading, it is judged whether or not all frames have been exposed (S302). If it is determined that the frame has been exposed, a warning is given by blinking the display or the like, and the process ends (S303). When it is determined in S302 that all the frames have not been exposed but partially exposed (S304), S305 to S317 are executed, and it is determined that they have not been partially exposed and have not been exposed. To S318-S3
Run 20. That is, in S305, first, the film is fed until the first frame of the film is detected to perform cueing, the unexposed frames are detected in S306 to S309, and while the exposed frame is being detected, The loop continues, and the pointer is incremented by 1 each time one frame is sent (S308) (S308).
309). The pointer P at the time when the unexposed frame is detected (S307) is recorded (S310).

Then, the counter L for counting the number of unexposed frames is set to 1 (S311). And S312-3
At 14, the film is continuously fed until an exposed frame is detected (S312), and during that period, it is determined whether or not each frame is an exposed frame (S313), and the counter L is counted by 1 for each frame detected. Up (S314).

When the exposed frame is detected, it is rewound to the position of the pointer P (S315) and returned to the unexposed head frame. In S316, the counter L indicates the head of the exposed frame, so L is decremented by 1, and this value is substituted for the unexposed frame number N in S317.

Steps S318 to 320 are for an unexposed film, and the number of films is read in S318, and this value is set to F. In S319, the film is wound up to the first frame, and in S320, F is substituted for the number N of unexposed frames.
The subsequent main routine of the camera is the same as that of the first embodiment, and therefore its explanation is omitted.

FIG. 10 is a block diagram showing a third embodiment of the present invention, and FIG. 11 is a flow chart showing the operation of FIG. In the block diagram of FIG. 10, the same functions as those in FIG. Figure 1
At 0, 30 is a release switch as a release means for setting the predetermined number of frames to 0 described in FIG. 5 of the first embodiment. The auto-loading state is the same as that in FIG. 2, and the main routine of the camera is the same as that in FIG. 3, so description thereof will be omitted. FIG. 11 shows switching of the display member, and the same functions as those in FIG. In FIG. 11, S901 is
It is determined whether or not the release switch 30 of FIG. 10 is turned on. If it is turned on, the process proceeds to S902, 0 is substituted for the predetermined number of frames K, and the process proceeds to S502. The following processing is the same as that in FIG. 5, but if the number of predetermined frames is set to 0, if there is even one frame that has not been exposed, it can be switched to partially exposed.

FIG. 12 is a block diagram showing a fourth embodiment of the present invention. In FIG. 12, 20 is a piece number input means for inputting an arbitrary number of one or more pieces, and 21 is a storage means for storing the number of pieces input by the piece number input means 20. The other structure is the same as that of FIG.

13 and 14 are flowcharts showing a part of the routine work of the camera in FIG.
It shows the same operation as in FIG. The same step numbers are assigned to the parts showing the same operations as in FIGS. 3 and 4, and the description thereof will be omitted. In FIG. 13, it is determined whether the switch (SW1) 6 is on or off (S403). As a result, if it is turned off, the number-of-pieces input means 20 and the storage means 21 in S420.
After inputting a predetermined number of frames with, and memorizing,
Returning to 1 and if it is on, the process proceeds to S404 and thereafter. Other operations are the same as those in FIG.

FIG. 15 is a flow chart showing the switching of the display member which is the display means of the film use state in the fourth embodiment of the present invention. Here, a variable value is used as the predetermined number of frames, and S4 of FIG.
The value input and stored at 20 is set as K, and it is determined whether or not the number of unexposed frames is 0 (S503). If N = 0, the unexposed frame number N is compared with a predetermined frame number K ( S514) As a result, N ≦
In the case of K, the display member is “exposed for all frames” in S515.
Switch to the position. If N> K instead of N = 0, the display member is switched to the partially exposed position in S516.

FIG. 16 is a block diagram showing the operation of FIG. In FIG. 16, the value of the unexposed counter 89 in FIG. 8 is compared with the value input by the input unit and the storage unit performed in the process of S420 of FIG. 13 by the comparison unit 90. Display switching means 8
The display member of the film cartridge is switched by 1. Since that point is the same as that in FIG. 8, description thereof will be omitted.

FIG. 17 is a flowchart of the main routine of the second embodiment of the present invention. Since the same functions as those in FIGS. 3 and 4 are designated by the same reference numerals, detailed description thereof will be omitted. The difference between FIG. 15 and FIGS. 3 and 4 is that the predetermined number of frames K input in S701 is limited to A or less. Due to this limitation, it is possible to prevent a large number of frames from being mistakenly input when a predetermined number of frames is input and a large number of unexposed frames are wasted.

FIG. 18 is a block diagram showing still another embodiment of the present invention. In FIG. 18, reference numeral 31 is a selection unit for selecting whether or not to display "all frames exposed" on the display unit of the film cartridge after the midway rewinding is completed. Further, other configurations are the same as those in FIG. 19 and 20 are flowcharts showing the main routine of the camera in the embodiment of FIG. 19 and 20, since the same step numbers as those in FIGS. 3 and 4 are attached, the description thereof will be omitted, but the difference from FIGS. 3 and 4 is that the display of the film cartridge is “all frame exposed”. It is a point to select whether or not to perform (S417A) and to switch the display member described later (S417B).

FIG. 21 is a flow chart showing the switching of the display member of the film cartridge. If the film is rewound midway before all frames have been shot, that is, if there are unexposed frames, the film cartridge display will indicate "Some frames have been exposed" or "All frames have been exposed." When the number N of unexposed frames is displayed (S522) and N = 0, the display member is displayed to display that all frames have been exposed. If it is switched (S525) or N is not 0, the display of the display member is "exposed only for some frames" or "exposed for all frames".
Which of the two is selected (S524), the display member is switched to "exposed only for some frames" (S526).

FIG. 22 is an operation block diagram of the embodiment in FIG. 18 according to the present invention. Since the same reference numerals as those in FIG. 8 have the same functions, the description thereof will be omitted. In FIG. 22, the photographing execution means executes the photographing operation on the film exposure surface and controls the unexposed counter 89 each time. The counter value of the unexposed frame counter 89 is displayed by the display means.
The display is displayed, and based on this value, the user selects the display of the display member of the film cartridge through the selection unit 30, and the display switching unit 81 switches the display member of the film cartridge.

FIG. 23 is a block diagram showing the main structure of a camera according to still another embodiment of the present invention. Components having the same functions as those in FIG. 16 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 23, reference numeral 100 is a selection means, and the contact piece 100a is connected to the contact piece 10 by an operation member (not shown).
It is configured to be able to conduct with 0b or 100c.

The flow chart for auto-loading in FIG. 21 is the same as that in FIG. 2 and its explanation is omitted.

24 and 25 are diagrams showing the main routine of the camera shown in FIG. 23, and FIG.
Elements having the same functions as those in FIG. 20 are designated by the same reference numerals, and their description will be omitted. 24 and 25, if the main switch 8 is turned on (S401) and the contact piece 100a of the selection means is in conduction with the contact piece 100b in S801, film rewinding is started and the process proceeds to S416. If the contact piece 100a is electrically connected to the contact piece 100C, the rewinding is started, and the process proceeds to S803 to wait for the film rewinding completion. If the contact piece 100a is not electrically connected to the other, the process proceeds to S403. To shoot. Also,
In S802, the display member switching means 18 switches the display member of the film cartridge to "all frame exposed". On the other hand, in S804, the display member switching means 1
By 8, the display member of the film cartridge is switched to "exposed only for some frames", and the process proceeds to S418.

[0040]

As described above, in the camera using the film cartridge having the display means for displaying the use state of the film, the number of unexposed frames is at least one frame and the predetermined frame number or less. In the case of, the display switching means displays "all frames exposed" on the film cartridge, and the input means for setting an arbitrary number of frames and the number of frames set by the input means are stored. When the number of unexposed frames is less than the predetermined number of stored frames by providing a storage means, the display means of the film cartridge displays "all exposed" so that the number of unexposed frames is small. It is possible to prevent the remaining film cartridge from being loaded into the camera again, so you can miss a photo opportunity, load the film, or load the film. Up, eliminating the hassle by repeating the rewind, for the user, it is possible to provide a very easy-to-use camera.

Further, by providing a releasing means for reducing the number of predetermined frames to 0, the film can be photographed to the last one frame as in the conventional case. Further, when the film is rewound during shooting, the display can be switched according to the way of thinking of the person who uses the camera by providing a selection means capable of selectively switching the display means of the film cartridge after the rewinding is completed. Therefore, it is possible to provide a camera that is very easy for the user to use.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a camera that is an embodiment of the present invention.

FIG. 2 is a flowchart showing a state of automatic loading in the prewind camera.

3 is a flowchart showing a main routine of the camera of FIG.

4 is a flowchart showing a main routine of the camera of FIG.

FIG. 5 is a flowchart showing switching of a display member which is a display means of a film use state.

FIG. 6 (a) is a diagram showing an unexposed film,
(B) is the figure shown to the film which was exposed.

FIG. 7 is a diagram showing a partially exposed film.

FIG. 8 is a block diagram showing the operation of the embodiment of the present invention.

FIG. 9 is a flowchart showing a state of auto loading in a normal wind camera as a second embodiment of the present invention.

FIG. 10 is a block diagram showing a third exemplary embodiment of the present invention.

11 is a flowchart showing the operation of FIG.

FIG. 12 is a block diagram showing a fourth exemplary embodiment of the present invention.

FIG. 13 is a flowchart showing a part of routine work of the camera in FIG.

14 is a flowchart showing a part of routine work of the camera in FIG.

FIG. 15 is a flow chart showing switching of a display member which is a means for displaying the film use state in the fourth embodiment of the present invention.

16 is a block diagram showing the operation of FIG.

FIG. 17 is a flowchart of a main routine according to the second embodiment of the present invention.

FIG. 18 is a block diagram showing still another embodiment of the present invention.

19 is a flow chart showing a main routine of the camera in the embodiment of FIG.

20 is a flow chart showing a main routine of the camera in the embodiment of FIG.

FIG. 21 is a flowchart showing switching of display members of the film cartridge.

22 is a block diagram showing an operation of the embodiment in FIG. 18 of the present invention.

FIG. 23 is a block diagram showing the main configuration of a camera that is still another embodiment of the present invention.

FIG. 24 is a diagram showing a main routine of the camera shown in FIG. 23.

FIG. 24 is a diagram showing a main routine of the camera shown in FIG. 23.

[Description of Codes] 1 Microprocessor of camera 8 Main switch 9 Magnetic recording circuit 10 Magnetic head 11 Rewind start button 16 Film 17 Film cartridge 18 Display member switching means 19 Display member reading means 20 Frame number input means 21 Storage means 30 Release Switch 31 display means 32 selection means 100 selection means

[Procedure amendment]

[Submission date] September 22, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a camera that is an embodiment of the present invention.

FIG. 2 is a flowchart showing a state of automatic loading in the prewind camera.

3 is a flowchart showing a main routine of the camera of FIG.

4 is a flowchart showing a main routine of the camera of FIG.

FIG. 5 is a flow chart showing switching of a display member which is a display means of a film use state.

6A is a diagram showing an unexposed film, and FIG. 6B is a diagram showing an exposed film.

FIG. 7 is a diagram showing a partially exposed film.

FIG. 8 is a block diagram showing the operation of the embodiment of the present invention.

FIG. 9 is a flowchart showing a state of auto loading in a normal wind camera as a second embodiment of the present invention.

FIG. 10 is a block diagram showing a third exemplary embodiment of the present invention.

11 is a flowchart showing the operation of FIG.

FIG. 12 is a block diagram showing a fourth exemplary embodiment of the present invention.

13 is a flowchart showing a part of routine work of the camera in FIG.

14 is a flowchart showing a part of routine work of the camera in FIG.

FIG. 15 is a flowchart showing switching of a display member which is a means for displaying a film use state in a fourth embodiment of the present invention.

16 is a block diagram showing the operation of FIG.

FIG. 17 is a flowchart of a main routine according to the second embodiment of the present invention.

FIG. 18 is a block diagram showing still another embodiment of the present invention.

19 is a flowchart showing a main routine of the camera in the embodiment of FIG.

FIG. 20 is a flowchart showing a main routine of the camera in the embodiment of FIG.

FIG. 21 is a flowchart showing switching of the display member of the film cartridge.

22 is a block diagram showing an operation of the embodiment in FIG. 18 of the present invention.

FIG. 23 is a block diagram showing the main configuration of a camera that is still another embodiment of the present invention.

FIG. 24 is a diagram showing a main routine of the camera shown in FIG. 23.

FIG. 25 is a diagram showing a main routine of the camera shown in FIG. 23.

[Description of Codes] 1 Microprocessor of camera 8 Main switch 9 Magnetic recording circuit 10 Magnetic head 11 Rewind start button 16 Film 17 Film cartridge 18 Display member switching means 19 Display member reading means 20 Frame number input means 21 Storage means 30 Release Switch 31 display means 32 selection means 100 selection means

Claims (5)

[Claims] 1. A film cartridge having a film use state display means for indicating whether the use state of the film in the film cartridge is all frames exposed, only some frames exposed, or all frames unexposed. In a camera having a discriminating means for discriminating the film use state, a display switching means for switching the display of the display means, and a midway rewinding means for forcibly rewinding the film, the number of unexposed frames is
A camera characterized in that, when at least one frame is present and the number of frames is less than a predetermined number, the display switching means causes the display means to display that all frames have been exposed. 2. The camera according to claim 1, further comprising release means for reducing the number of predetermined frames to 0. 3. A frame number input means for inputting an arbitrary number of frames, and a storage means for storing the number of frames input by said frame number input means, wherein the number of unexposed frames is set. A camera characterized in that when the number of stored frames is less than or equal to the number of stored frames, the display switching means displays the display means of the film cartridge as "all frames exposed". 4. A film cartridge having a film use state display means for displaying whether the use state of the film in the film cartridge is all frames exposed, only some frames exposed, or all frames unexposed. In a camera having a discriminating means for discriminating a film use state, a display switching means for switching the display on the display means, and a midway rewinding means for forcibly rewinding the film, a midway rewinding means is used for midway rewinding. In the case of performing, the display switching means has a selection means capable of selectively switching the display means of the film cartridge to either one of a part of frames exposed or all frames exposed. camera. 5. The camera according to claim 4, further comprising display means for displaying the number of unexposed frames after the rewinding is completed.