JPH09329833A - Camera using cartridge capable of displaying use condition of film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera using a film cartridge capable of preventing the occurrence of double exposure when the finder cartridge is loaded again. SOLUTION: The camera is provided with a discriminating means for discriminating the using state of the film 16 stored in the film cartridge, that is, whether the film 16 is unexposed, or, the film is in the middle of exposing, or all the frames of the film is exposed, then, it is enabled to load the cartridge in the middle of exposing again and photograph from the unexposed frame. In the case the abnormality in feeding the film is detected by operating a perforation detection circuit 18 under the control of a microprocessor 18, the set position of the using state of the film cartridge to be set on the rotary meother 17 for displaying bar code information is judged as that all the frames is exposed, then, the occurrence of double exposure is prevented when the film cartridge is loaded again.

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 having a display section for displaying the usage status of film.

[0002]

2. Description of the Related Art Conventionally, in a camera using a film cartridge provided with a display section for displaying a use state of a film by a bar code or the like, Japanese Patent Application Laid-Open No. 4-172433 discloses a method of magnetic recording. A camera has been proposed in which all the frames of the cartridge have been exposed by rewinding midway when the head touch is defective or the power supply of the head drive circuit is abnormal.

Further, in Japanese Patent Laid-Open No. 4-365025, when the photographed frames cannot be discriminated even if all the frames of the film cartridge in use (during exposure) are counted, it is judged as a failure and the display of the state of use is exposed for all frames. A camera has been proposed that has already been used and that photography is prohibited.

Further, in Japanese Unexamined Patent Publication No. 5-53188, if a magnetic head is kept in contact with the film when an abnormal film feeding is detected, the film is deformed or the magnetic head is deteriorated. There is a possibility that the magnetic head may be retracted from the film surface.

[0005]

However, in the above-mentioned conventional examples, in the first and second proposals, only the magnetic failure is considered, and the failure at the time of feeding is not described.

Further, although the third proposal takes into consideration an abnormality at the time of feeding, nothing is mentioned about the setting of the usage state of the film cartridge because only the magnetic head is retracted at that time. There is a problem.

Accordingly, an object of the present invention is as follows.
To provide a camera that uses a cartridge that can display the usage status of a film and can completely avoid the inconvenience of double exposure when a film cartridge in the middle of exposure is reloaded and shooting can be performed from an unexposed frame. is there.

Further, an object of the invention described in claim 2 is that, when the film which cannot be wound up has incomplete magnetic recording and the film cartridge is put in a halfway position, it is doubled when reloaded. It is an object of the present invention to provide a camera that uses a cartridge that can display the usage status of a film and that can prevent such double exposure because there is a possibility of exposure.

Further, an object of the invention described in claim 3 is to prevent an erroneous operation of a photographer in the case of abnormal film winding.
An object of the present invention is to provide a camera that uses a cartridge that can surely perform a rewinding operation and that can display a usage state of a film.

It is another object of the present invention to provide a camera using a cartridge capable of accurately displaying the film winding state, which can accurately detect film winding abnormalities.

Further, an object of the invention described in claim 5 is to use a film capable of performing a smooth abnormality process without trouble of a photographer when the abnormality is detected after the battery is reinserted and the operation is restarted. An object is to provide a camera using a displayable cartridge.

Further, an object of the invention described in claim 6 is to carry out shutter charge, when abnormality of charge is detected.
All the frames of the film cartridge have been exposed,
An object of the present invention is to provide a camera that uses a cartridge that can display the usage status of a film and that can prevent double exposure due to reloading.

Further, an object of the invention described in claim 7 is to carry out shutter charge, when abnormality of charge is detected.
An object of the present invention is to provide a camera that uses a cartridge that can display a usage state of a film and that can reliably perform a rewinding operation while preventing an erroneous operation by a photographer.

Further, an object of the invention described in claim 8 is to carry out shutter charging, when abnormality of charging is detected.
An object of the present invention is to provide a camera using a cartridge capable of displaying a usage state of a film capable of accurately detecting an abnormality.

Further, an object of the invention described in claim 9 is to carry out a smooth abnormality process without trouble for a photographer when the abnormality is detected after recharging the battery by recharging the battery when shutter charging is performed. Another object of the present invention is to provide a camera using a cartridge capable of displaying the usage status of a film.

[0016]

The structure for realizing the object of the invention according to the present application is, as described in claim 1, whether or not the use state of the film cartridge is unexposed, in the middle of exposure and after all frames have been exposed. Double exposure for prohibiting shooting when an abnormality in film feeding is detected in a camera that has a judging means for A camera using a cartridge capable of displaying a use state of a film, which is provided with a preventing means.

According to this structure, even when the film cartridge in the middle of exposure is reloaded and the image is taken again from the unexposed frame, double exposure can be completely prevented.

A specific configuration for achieving the object of the invention according to the present application is, as described in claim 2, in a camera using the cartridge capable of displaying the use state of the film according to claim 1, wherein the double exposure is performed. The prevention means includes a film winding means and a film rewinding means for feeding, a film winding abnormality detecting means, a film use state setting means, and means for activating the rewinding means in response to a manual operation, When an abnormality is detected by the film winding abnormality detecting means, the rewinding means by manual operation can be operated and after rewinding, the use state setting means for the film sets the use state of the film at a position indicating that all frames have been exposed. The present invention relates to a camera using a cartridge capable of displaying a use state of a film.

According to this structure, the film use state setting means can set the use state of the film cartridge to the position indicating that all frames have been exposed, which prohibits photographing when the film winding is abnormal.

Another specific configuration for achieving the object of the invention according to the present application is, as described in claim 3, a manual operation when an abnormality is detected by the film winding abnormality detecting means. According to another aspect of the present invention, there is provided a camera using the cartridge capable of displaying the use state of the film, wherein operations other than means for operating the rewinding means are prohibited.

According to this structure, when the film winding abnormality is detected, it is possible to reliably perform the rewinding operation by prohibiting other photographing operations.

Another specific configuration for achieving the object of the invention according to the present application is, as described in claim 4, in which the abnormality detection by the film winding abnormality detection means returns the film to the position at the time of exposure. At least 1 to rewind
A camera using a cartridge capable of displaying a use state of a film according to claim 2, wherein abnormal detection is performed when the film is wound a plurality of times or more and winding is impossible during that time.

According to this structure, it is possible to accurately detect an abnormality in film winding.

Another specific configuration for realizing the object of the invention according to the present application is, as described in claim 5, automatically rewinding when it is determined that an abnormality has been detected after re-inserting the battery. According to another aspect of the present invention, there is provided a camera using the cartridge capable of displaying the use state of the film.

According to this structure, when an abnormality is detected in the re-operation after the battery is reinserted, the abnormality processing can be automatically performed without the trouble of the photographer.

Another structure for realizing the object of the invention according to the present application is, as described in claim 6, in a camera using the cartridge capable of displaying the use state of the film according to claim 1, wherein the double exposure prevention is performed. Means, film winding means for film feeding and film rewinding means, means for charging between the end of shooting until the next shooting standby state, charge abnormality detection means, film use state setting means,
A means for activating the rewinding means in response to a manual operation is provided,
When an abnormality is detected by the charge abnormality detecting means, the rewinding means by manual operation can be operated and after rewinding, the use state setting means of the film sets the use state of the film at a position indicating that all frames have been exposed. The present invention relates to a camera using a cartridge capable of displaying a use state of a film.

According to this structure, even when shutter charging is performed, double exposure can be completely prevented when the film cartridge in the middle of exposure is reloaded and an image is taken again from an unexposed frame.

A specific configuration for achieving the object of the invention according to the present application is such that, when an abnormality is detected by the charge abnormality detecting means, the rewinding means is manually operated. 7. A camera using a cartridge capable of displaying a use state of a film according to claim 6, wherein an operation other than an actuating means is prohibited.

According to this structure, even when the shutter charging is performed, when the abnormality is detected, the rewinding operation can be surely performed by prohibiting the other photographing operation.

As another specific configuration for achieving the object of the invention according to the present application, as described in claim 8, abnormality detection by the charge abnormality detection means is performed at least once and a plurality of times, and charging is performed during that time. A camera using a cartridge capable of displaying a use state of a film according to claim 6, wherein abnormality detection is performed when the cartridge cannot be used.

According to this structure, the abnormality can be accurately detected even when the shutter charge is performed.

Another specific configuration for achieving the object of the invention according to the present application is, as described in claim 9, automatically rewinding when it is determined that an abnormality has been detected after the battery is reinserted. According to another aspect of the present invention, there is provided a camera using the cartridge capable of displaying the use state of the film.

According to this configuration, even when the shutter charge is performed, when the abnormality is detected by the re-operation after the battery is reinserted, the abnormality processing can be automatically performed without the trouble of the photographer. .

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a camera according to an embodiment of the present invention. FIG. 2 is a flowchart of the operation of the camera of the first embodiment of the present invention.

In FIG. 1, 1 is a microprocessor for controlling 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 these are well-known circuits.

6 is a photometry / distance measurement start switch (SW1),
A shooting operation start switch (SW2) 7 is a switch that is turned on at the first stroke and the second stroke of the release button, respectively. 8 is a main switch, 9 is a magnetic recording circuit, 10 is a magnetic head, 11 is a back cover switch for knowing the open / closed state of the back cover, 12 is bar code information reading means, 13 is shutter speed or aperture value, or film. A display circuit for displaying the presence / absence of a cartridge, a warning of film removal, and the like, and 14 is a rewind start button (REW).

Reference numeral 15 is a motor drive circuit for feeding the film 16, reference numeral 17 is integrally provided on a film supply spool in a cartridge for accommodating the film 16, and a bar code is provided on the surface which rotates as the film supply spool rotates. With a rotating member as a barcode recording part where is recorded,
The bar code indicates the film sensitivity, the number of recordable images, the film exposure process, and the usage status such as exposure of all frames. Reference numeral 18 denotes a perforation detection circuit, which includes, for example, a light projecting unit and a light receiving unit of a photo interrupter,
Detects the presence or absence of perforations.

Next, the operation of the first embodiment will be described with reference to the flowchart of FIG. First, when the power is turned on (S100), it is detected whether a cartridge is loaded (S110).

If the unloaded state is changed to the loaded state, the first sheet of the film 16 is set in a shooting standby state. Therefore, after reading the ISO sensitivity and the number of shots that can be taken from the bar code on the film cartridge, the film is automatically read. Loading is performed (S120).

Next, when the power is turned off last time, a winding NG flag check is performed in order to detect whether the film winding is normally ended or abnormally ended (S13).
0). If the NG flag is off after the normal termination,
Then, it is determined whether or not the REW button 14 is pressed (S140). If the REW button 14 is pressed, the film is rewound (S310), and the state of use of the film cartridge is stopped during use (exposure) (S3).
20).

On the other hand, if it is determined in S140 that the REW button 14 is not pressed, it is determined whether or not the release button is pressed. If not, the process returns to S140 (S1
If the button is pressed, the film is exposed (S16).
0). When the exposure is completed, film winding is started (S170). A timer for determining whether or not perforation ends within a fixed time is started (S1
80), magnetic information is recorded on the film by the magnetic recording circuit 9 while the film 16 is being fed (S190).

It is judged whether or not the timer started in S180 has exceeded a certain time (S200), the perforation is detected by the perforation detection circuit 18, and it is judged whether or not one frame feeding is completed ( S
210). If the feeding of one frame by the perforation detection is completed within the fixed time, the film winding is completed (S220).

Then, the number of frames is incremented by 1 (S230) and the winding NG flag is cleared (S24).
0). The current number of frames is compared with the number of shootable images read during auto loading in S120 (S25
0), if the maximum number of shots is reached, the film is rewound (S290).

When the feeding of one frame is not normally completed in the determination of S210, the winding NG flag is set (S260), a warning is displayed by blinking the display portion (S270), and the REW button is pressed. Wait until 14 is operated (S
280). When the REW button 14 is operated, the film is rewound (S290), and the state of use of the film cartridge is displayed as all frames have been exposed and stopped (S300). If the one-frame feeding is not completed normally, this process is S190.
It is possible that the magnetic recording performed in step 2 was not performed normally, so if the film cartridge usage status display is set to mid-use (during exposure), this frame will be treated as an unexposed frame when reloaded. Since there is a risk of double exposure, this is a process to prevent it.

If the winding NG flag is set in the flag check of S130, it means that the feeding of one frame has not been normally completed when the power was turned off last time.
The operation is restarted from the film winding of 170.

According to the first embodiment as described above,
As the operation of the abnormality detecting means, the timer start of S180 and the abnormality of the film winding are detected by the determinations of S200 and S210. In the case of abnormality, the film rewinding cartridge is used as the exposure state of all frames and the photographing is prohibited. It is possible to avoid reloading and shooting to cause double exposure.

(Second Embodiment) Next, a second embodiment of the present invention will be described. FIG. 3 is a flowchart of the operation of the camera according to the second embodiment of the present invention.
The block diagram of the camera of the previous embodiment shown in FIG.
The same applies to the embodiment.

The second embodiment shown in FIG. 3 relates to an abnormal process of the camera which performs shutter charging after the end of shooting until the next shooting standby state, but the first embodiment shown in FIG. Since there are many processes common to the case of FIG. 2, the same processes as those in FIG. 2 are denoted by the same step symbols, duplicate description is omitted, and different processes will be described in detail.

First, detection of cartridge loading (S11)
0), after the auto-loading (S120) process,
To detect whether shutter charge ended normally or abnormally when the power was turned off last time, charge N
The flag of the G flag is checked (S125).

Charge is NG by the flag check in S125.
If the flag is ON and the previous shutter charge has not ended normally, the operation is restarted from the shutter charge and the shutter charge for the next shooting is performed (S161). Next, a timer for determining whether charging is completed within a fixed time is started (S162). If the timer does not expire within a certain time,
In other words, time up? If YES, the shutter charge itself is abnormal, so the charge NG flag is set as shutter charge abnormality processing (S16).
6). After that, a warning is displayed by blinking on the display unit (S167), and the power is turned off (S168).

On the other hand, in S163, when the shutter charge timer expires within a certain time, that is, time up? If NO, the charge is OK (S164),
The charge NG flag is cleared (S165). After this, the operation is the same as that of the previous embodiment. From the start of film winding (S170), it is determined whether the winding is completed within a certain time (S200), and if abnormal, the winding NG flag is set. (S260), the film is rewound (S290), and the exposure is stopped after all frames have been exposed (S30).
0), the same processing as in the case of FIG. 2 is performed.

In the above processing, the processing relating only to the shutter charge is the normal processing from S161 to S165 and the abnormal processing from S163 to S168.
The process of the charge abnormality detecting means described in claim 6 is the same film feeding abnormality detection as in the first embodiment including the shutter charge check in the preceding stage.

According to the second embodiment as described above,
The charge abnormality detecting means checks the shutter charge, warns when the charge is defective, and stops, and when the charge is normal, checks whether the film winding is completed within a fixed time. Abnormality of charge and overall abnormality of film feeding are detected, and if film feeding is abnormal, all frames are set to exposed. Therefore, even when shutter charging is performed, there is no problem such as double exposure. It can be prevented.

(Third Embodiment) Next, a third embodiment of the present invention will be described. FIG. 4 is a flow chart of the operation of the camera of the third embodiment of the present invention.
The block diagram of the camera shown in FIG. 1 is common to the case of the third embodiment.

In the third embodiment shown in FIG. 4, the winding N
Although the G flag is checked a plurality of times, many processes are the same as those in the flowchart of the first embodiment shown in FIG. The different processing will be omitted and will be described.

The process different from the flowchart of the first embodiment shown in FIG. 2 is that the film winding is not completed within a certain time in the process of S200, and the time is up? If YES, the winding NG flag is determined (S255), if the flag is OFF, the processes of S260 to S280 are performed as in FIG. 2, and if the flag is ON, a warning is displayed (S256). ), The film is rewound (S29)
0) point.

According to the third embodiment as described above,
In addition to the effect of preventing double exposure according to the first embodiment,
The winding NG flag is checked again at the timing of abnormality detection, and immediately when the winding NG flag is ON,
Since a warning is displayed and rewinding is performed, quick and reliable abnormality processing can be performed.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. FIG. 5 is a flowchart of the operation of the camera of the fourth embodiment of the present invention.
The block diagram of the camera shown in FIG. 1 is common to the case of the fourth embodiment.

In the fourth embodiment shown in FIG. 5, the charge NG flag check and the winding NG flag check are performed a plurality of times, respectively. However, in the second embodiment shown in FIG. Since many processes are the same as those in the flow chart, the same processes will be denoted by the same step symbols, redundant description will be omitted, and processes of different parts will be described.

The processing different from the flow chart of the second embodiment shown in FIG. 3 is to check the charge NG flag again (S126) when the shutter charge is not completed within the predetermined time in the determination of S163. And S
If the film winding is not completed within the fixed time in the determination of 200, the winding NG flag is checked again (S255). If either the charge NG flag or the winding NG flag is ON,
A warning is displayed (S256), and the film is immediately rewound (S290).

According to the fourth embodiment as described above,
In addition to the effect of preventing double exposure when performing shutter charge according to the second embodiment, the charge NG flag and the winding NG flag are checked again at each abnormality detection timing, and if either is ON Promptly displays a warning and rewinds, so quick and reliable abnormality processing can be performed.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described. FIG. 6 is a flowchart of the operation of the camera of the fifth embodiment of the present invention.
The block diagram of the camera shown in FIG. 1 is common to the fifth embodiment.

The fifth embodiment shown in FIG. 6 is the fourth embodiment.
As described above, when the film winding abnormality is detected, the film is rewound a plurality of times, and it is determined that the abnormality is detected for the first time. Since many of the processes are the same as those in the flowchart of the first embodiment shown, the same process parts are denoted by the same step symbols, duplicate description will be omitted, and different points will be extracted and described.

The difference from the first embodiment shown in FIG. 2 is that if the film winding is not completed within a certain time in S200, the winding NG flag is judged again (S255), and the winding NG flag is judged. If is OFF, the number of rewinding is checked (S257). If the number of rewinding is the first time, the film is rewound to the original position (S258), and the film winding start in S170 and thereafter are repeated.

If the number of rewinding is 2 or more in the check of S257, S260 is performed as in the flow chart of FIG.
The difference is that the winding NG flag setting up to S280 is performed. If the determination in S255 is ON, a warning is displayed (S256) and the film is immediately rewound (S290).

According to the fifth embodiment as described above,
In the film winding abnormality detection stage, after the film is rewound to the position at the time of exposure a plurality of times, it is determined that the film winding is abnormal, so that the winding abnormality can be accurately detected.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described. FIG. 7 is a flowchart of the operation of the camera of the sixth embodiment of the present invention.
The block diagram of the camera shown in FIG. 1 is common to the sixth embodiment.

The sixth embodiment shown in FIG.
As described above, in the charge abnormality detection, the operation including the method of performing the charge abnormality detection after performing the charge retry times a plurality of times, and including the second operation shown in FIG.
Since many of the processes are the same as those in the flow chart of the embodiment, the same processes are denoted by the same step symbols, duplicate description will be omitted, and different processes will be extracted and described.

The difference from the second embodiment shown in FIG. 3 is that the shutter charge is not completed within a fixed time in the determination of S163, the charge NG flag is checked again (S126), and the determination of S200 is made. If the film winding is not completed within a certain time, the winding NG flag is checked again (S255). In this case, if both flags are ON, a warning is displayed (S256) and the film is immediately rewound (S290). If the charge NG flag is off in the determination in S126, the number of charge retries is further determined (S127), and the number of tries is 1.
In the case of the first time, the process returns to the shutter charge process of S161, and the subsequent steps are repeated.

If the number of tries is the second or later in the determination of S127, the processing after the charge NG flag is set in S166 is executed as in the flow chart of FIG.

According to the sixth embodiment as described above,
Even when detecting the abnormality in the shutter charge, the charge retry is performed a plurality of times to determine that the abnormality is occurring, so that the abnormality can be accurately detected.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described. FIG. 8 is a flowchart of the operation of the camera of the seventh embodiment of the present invention.
The block diagram of the camera shown in FIG. 1 is common to the case of the seventh embodiment.

The seventh embodiment shown in FIG.
As described in (1) above, this relates to the abnormal processing immediately after the battery is reinserted, and is an example in which rewinding is automatically performed.

FIG. 8 is almost the same as the flow chart of the first embodiment shown in FIG. 2, except that if the flag is ON in the check of the winding flag in S130 after the battery is reinserted, it is prompt. , Rewind the film (S2
90) points.

According to the seventh embodiment as described above,
If an error is detected after re-inserting the battery and restarting the operation, rewinding is automatically performed without bothering the photographer.
You can prevent unnecessary troubles.

(Eighth Embodiment) Next, an eighth embodiment of the present invention will be described. FIG. 9 is a flowchart of the operation of the camera of the eighth embodiment of the present invention.
The block diagram of the camera shown in FIG. 1 is common to the case of the eighth embodiment.

The eighth embodiment shown in FIG. 9 is defined by claim 9.
As described above, in the abnormal processing after the battery is reloaded when the shutter charge is performed, it is an example of automatically rewinding.

9 is different from the flowchart of the second embodiment shown in FIG. 3 in that the charge NG in S125 is
In both the flag check and the winding NG flag check in S130, if the flag is ON, it is a point to immediately rewind the film (S290).

According to the eighth embodiment as described above,
When shutter charging is performed, the battery is reinserted and restarted, and when an abnormality is detected, the film is automatically rewound without bothering the photographer, and unnecessary troubles can be avoided.

(Other Embodiments) The double-exposure prevention system of the present invention described so far is applicable to all cameras using a film cartridge capable of magnetically recording photographic information, and a dedicated lens is used. From the built-in compact camera to the interchangeable lens SLR camera,
It is effective when applied to a camera equipped with a cartridge half-way replacement function.

[0081]

As described above, according to the first aspect of the present invention, in the case where an abnormality in feeding is detected in a camera capable of taking a picture by reloading a film cartridge which is in use. Since the photographing is prohibited, double exposure can be completely avoided when the film cartridge which is being used is reloaded.

Further, according to the second aspect of the invention, when an abnormal film winding is detected, the film is rewound to set the use state of the film at the position where all frames have been exposed. Therefore, when the film winding is abnormal, it is possible to prevent double exposure at the time of reloading by prohibiting the photographing because all frames have been exposed.

Further, according to the third aspect of the invention, when the abnormal film winding is detected, the operation other than the means for operating the rewinding means by the manual operation is prohibited, so that the erroneous operation by the photographer is prevented. Thus, the rewinding operation can be surely performed.

Further, according to the invention described in claim 4, when the abnormality of the film winding is detected, the abnormality is detected a plurality of times and then the abnormality is judged, so that the abnormality of the film winding is accurately detected. It can be carried out.

Further, according to the invention described in claim 5, the rewinding is automatically performed when the abnormality is detected after the re-operation after the battery is reinserted. Abnormality processing can be performed.

Further, according to the invention described in claim 6, the use state of the film cartridge is set to a position indicating that all frames have been exposed when the charge abnormality is detected when the shutter charge is performed. Double exposure at the time of loading can be prevented.

Further, according to the invention described in claim 7, since the operation other than the means for activating the rewinding means by the manual operation when the abnormality of the charge is detected is prohibited, the erroneous operation of the photographer is prevented. The rewinding operation can be surely performed.

Further, according to the invention described in claim 8, when the abnormality of the charge is detected, the abnormality is detected a plurality of times and then the abnormality is judged, so that the abnormality of the charge can be accurately detected. it can.

Further, according to the ninth aspect of the present invention, even when the shutter charge is performed, the rewinding is automatically performed when an abnormality is detected after the battery is reinserted and restarted. It is possible to perform smooth abnormality processing without bothering the user.

[Brief description of drawings]

FIG. 1 is a block diagram of a camera according to an embodiment of the present invention.

FIG. 2 is a flowchart of the operation of the camera of the first embodiment of the present invention.

FIG. 3 is a flowchart of the operation of the camera of the second embodiment of the present invention.

FIG. 4 is a flowchart of the operation of the camera of the third embodiment of the present invention.

FIG. 5 is a flowchart of the operation of the camera of the fourth embodiment of the present invention.

FIG. 6 is a flowchart of the operation of the camera of the fifth embodiment of the present invention.

FIG. 7 is a flowchart of the operation of the camera of the sixth embodiment of the present invention.

FIG. 8 is a flowchart of the operation of the camera of the seventh embodiment of the present invention.

FIG. 9 is a flowchart of the operation of the camera of the eighth embodiment of the present invention.

[Explanation of symbols]

 1 Microprocessor 2 Photometric circuit 3 Distance measuring circuit 4 Shutter control circuit 5 Aperture control circuit 6 SW1 7 SW2 8 Main switch 9 Magnetic recording circuit 10 Magnetic head 12 Bar code information reading means 13 Display circuit 14 REW button 15 Motor drive circuit 16 Film 17 Rotating member 18 Perforation detection circuit

Claims (9)

[Claims] 1. A film cartridge housed in a film cartridge has a discriminating means for discriminating whether it is in an unexposed state, in the middle of exposure, or when all frames have been exposed. Even if it is determined that the film can be taken again from an unexposed frame, the film is equipped with double exposure prevention means for prohibiting shooting when an abnormality in film feeding is detected. A camera that uses a cartridge that can display status. 2. A camera using a cartridge capable of displaying a use state of a film according to claim 1, wherein the double exposure prevention means is a film winding means and a film rewinding means for feeding, and a film winding abnormality detection. Means, a film use state setting means, and a means for activating the rewinding means in response to a manual operation, and when the abnormality is detected by the film winding abnormality detecting means, the rewinding means can be manually operated. As described above, after rewinding, the use state of the film is set by the use state setting means of the film to a position indicating that all frames have been exposed. 3. The film according to claim 2, wherein when an abnormality is detected by the film winding abnormality detecting means, operations other than means for operating the rewinding means in response to a manual operation are prohibited. A camera that uses a cartridge that can display the usage status of the camera. 4. The abnormality detection by the film winding abnormality detecting means is performed by returning the film to the position at the time of exposure and rewinding it at least once a plurality of times and detecting the abnormality when the winding is impossible during that time. A camera using the cartridge capable of displaying the use state of the film according to claim 2. 5. A camera using a cartridge capable of displaying a use state of a film according to claim 4, wherein rewinding is automatically performed when it is judged that an abnormality has been detected after reinserting the battery. 6. A camera using the cartridge capable of displaying the use state of the film according to claim 1, wherein the double exposure preventing means is a film winding means and a film rewinding means for feeding, Means for charging before the shooting standby state, charge abnormality detection means, film use state setting means, and means for activating the rewinding means in response to manual operation are provided. When an abnormality is detected, the rewinding means by manual operation is made operable, and after rewinding, the use state of the film is set to a position indicating that all frames have been exposed by the use state setting means of the film. A camera that uses a cartridge that can display the usage status of the camera. 7. The state of use of the film according to claim 6, wherein, when an abnormality is detected by the charge abnormality detecting means, operations other than means for operating the manual rewinding means are prohibited. A camera that uses a displayable cartridge. 8. The abnormality detection by the abnormality detecting means for charging is carried out at least once a plurality of times, and if the charging is impossible during that time, the abnormality detection is performed.
A camera using a cartridge capable of displaying the use state of the film described. 9. A camera using a cartridge capable of displaying a use state of a film according to claim 8, wherein rewinding is automatically performed when it is judged that an abnormality has been detected after reinserting the battery.