JPH04304437A - Film feeding controller for camera - Google Patents

Abstract

PURPOSE:To provide a film feeding controller for camera in which the waste of a film is prevented in the case of inadvertently opening a back cover in the midst of photographing. CONSTITUTION:In the film feeding controller for camera which is provided with a film feeding means 101, feeds the film by a 1st specified amount with the closing action of the cover of a cartridge after loading the cartridge, and thereafter winds the film to a winding spool by one frame every time photographing on each frame is finished, a decision means 102 for deciding whether or not the cover of the cartridge is opened in a period from finishing feeding the film by the 1st specified amount till performing rewinding the film, and a control means 103 for controlling the means 101 so that the film may be wound by a 2nd specified amount equivalent to the film amount exposed by opening the cover of the cartridge with the succeeding closing action of the cover of the cartridge in the case of deciding that the cover of the cartridge is opened in the above period are provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feed control device for a camera, and in particular takes measures against the case where the cartridge cover is opened during photographing.

0002

[Prior Art] In a normal camera, a first predetermined number of frames (
For example, 4 frames) film feeding (hereinafter referred to as initial feeding)
to make it ready for shooting. On the other hand, if you accidentally open the camera back during shooting, a portion of the film will be exposed, so when you close the camera camera camera, you can wind the film to a predetermined number of frames, allowing you to shoot with unexposed frames. It is necessary to keep it in a good condition. Here, the term "during shooting" refers to the period from the completion of the initial feeding until the film is rewound.

0003

[Problems to be Solved by the Invention] By the way, in the structure of a general camera, the amount of film winding when the back cover is opened and then closed during shooting is greater than the amount of film winding when loading the film, that is, during the initial advance. In many cases, less is enough. However, conventional cameras do not have a means to determine whether when the back cover is closed, it is when loading film, or whether the back cover is opened in the middle of shooting and then closed again as described above.
When the back cover is closed, the film is wound up by the same amount in the latter case as in the former case, that is, more film is wound than necessary, resulting in wasted film.

SUMMARY OF THE INVENTION An object of the present invention is to provide a film feed control device for a camera that prevents film from being wasted even if the back cover is accidentally opened during photography.

[0005]

[Means for Solving the Problems] To explain with reference to FIG. 1, which is a diagram corresponding to the claims, the invention of claim 1 is provided with a film feeding means 101, and a first film feeding means 101 is provided, and a film feeding means 101 is provided, and a first Feed a predetermined amount of film,
Thereafter, the invention is applied to a film feed control device of a camera that winds the film one frame at a time onto a take-up spool each time the photographing of each frame is completed. Determination means 1 determines whether or not the cartridge lid is opened during the period from the completion of feeding the first predetermined amount of film until the rewinding of the film.
02, if it is determined that the cartridge lid has been opened during the above period, then with the subsequent closing operation of the cartridge lid, a second predetermined amount of film corresponding to the amount of film exposed by opening the cartridge lid is removed. control means 103 for controlling the film feeding means 101 for winding;
This solves the above problem. Similarly, explaining with reference to FIG. 1, the invention of claim 3 provides a film feeding means 1
01, and is applied to a film feed control device of a camera that winds the film to the end when the cartridge lid is closed after loading the cartridge, and then rewinds the film one frame at a time into the cartridge after each frame is photographed. Ru. Then, the determining means 102 determines whether or not the cartridge lid is opened during the period from when the film is wound to the end until the last frame of the film is rewound, and the controlling means 102
3, if it is determined that the cartridge lid has been opened during the above period, with the subsequent closing operation of the cartridge lid,
Film feeding means 1 for rewinding the film by a predetermined amount corresponding to the amount of film exposed by opening the cartridge lid.
Controls 01.

[0006]

[Operation] (1) In the invention of claim 1 which adopts the normal winding method, the determining means 102
determines whether or not the cartridge lid is opened during the period from when the first predetermined amount of film feeding (initial feeding) is completed until the film is rewound. Control means 1
03, when it is determined that the cartridge lid has been opened during the above period, the film feeding means 101 is controlled in accordance with the subsequent closing operation of the cartridge lid, and the amount of film corresponding to the amount of film exposed by opening the cartridge lid is controlled. The film is wound by a second predetermined amount. (2) In the device adopting the invention prewind method of claim 3, the determining means 1
Step 02 determines whether or not the cartridge lid has been opened during the period from when the film is wound to the end until the last frame of the film is rewound. If it is determined that the cartridge lid has been opened during the above period, the control unit 103 controls the film feeding unit 101 in accordance with the subsequent closing operation of the cartridge lid, and controls the amount of film exposed by opening the cartridge lid. Rewind the film by a predetermined amount corresponding to .

[0007]

Embodiments - First Embodiment - A first embodiment of the present invention will be explained with reference to FIGS. 2 to 4. FIG. FIG. 2 is a schematic rear view of the camera. Reference numeral 1 denotes a camera body, and 2 denotes a cartridge lid provided at the bottom of the camera body 1 so as to be openable and closable. When the cartridge lid 2 is opened, a film cartridge 10 can be loaded into the cartridge chamber of the camera body 1. Here, the cartridge 10 of this embodiment is disclosed in, for example, US Pat. No. 4,832,275 and US Pat.
This type is disclosed in Japanese Patent No. 06, and when the film 12 is not loaded in the camera body 1, the film 12 is stored in the cartridge 10 up to the leading end.

When the cartridge 10 is loaded, a fork (not shown) is engaged with the spool shaft 11 (FIG. 3) of the cartridge 10, and when this fork rotates in a predetermined direction, the film 12 wound around the spool shaft 11 is released. is Patrone 10
sent outside. The fed film 12 passes immediately after the aperture AP and is wound around the winding spool 3, and thereafter is wound up by the rotation of the winding spool 3. Reference numeral 5 denotes a photo interrupter that detects perforations P (one perforation is provided for each frame) of the film 12.

[0009] With the above configuration, unlike conventional cameras, there is no need to pull out a predetermined amount of film from the cartridge and wind it onto the take-up spool when loading film. There is no need for a traditional case back that opens and closes the whole thing. For this reason, as shown in the figure, a bottom lid type cartridge lid 2 is used which opens and closes only the cartridge chamber. The number of film frames that are exposed when such a cartridge cover 2 is opened during photographing is smaller than in the case of a conventional camera back cover.

FIG. 3 is a diagram showing the overall structure of the film feeding control device of the camera. As shown in the figure, the film 12 described above is provided with a magnetic recording area 12b below the exposure area 12a of each frame, and print prohibition information can be recorded by the magnetic head 6 in this magnetic recording area 12b. The print prohibition information is information for prohibiting printing of that piece in the laboratory. Further, the winding spool 3 is connected to a film feeding motor 4 via gears G1 to G4.
Rotationally driven by. SW1 is the cartridge lid 2 mentioned above.
A cartridge lid detection switch that turns on when opened and turns off when closed.
SW2 is a cartridge presence/absence switch that is turned on when cartridge 10 is loaded and turned off when cartridge is not loaded, and 7 is a shutter.

Reference numeral 17 denotes a control circuit that controls the sequence of the entire camera, and this control circuit 17 includes the motor 4.
a motor drive circuit 16, a film feed amount detection circuit 13 that detects the film feed amount from the output of the photo interrupter 5, a magnetic recording circuit 14 that drives the magnetic head 6 to record information, and an exposure control circuit that drives the shutter 7. Control circuit 15
is connected, and the cartridge lid detection switch S
W1, cartridge presence/absence switch SW2, release switch SW3, and rewind switch SW4 are connected.

Here, the camera of this embodiment has Patrone 1.
This is a so-called normal wind type film in which a predetermined amount of film is initially fed as the cartridge lid 2 is closed after zero loading, and then the film is wound one frame at a time after each frame is photographed. When the rewind switch SW4 is turned on during shooting, the control circuit 17 drives the motor 4 through the motor drive circuit 16 to rewind the film 12. Also, when it is determined that all frames have been photographed,
Control circuit 17 rewinds film 12.

Next, the control procedure when the cartridge cover is opened by the control circuit 17 will be explained based on the flowchart of FIG. When the cartridge lid 2 is opened and the cartridge lid detection switch SW1 is turned on, the program shown in FIG. 4 is started and waits until the cartridge lid 2 is closed in step S1. When the cartridge lid 2 is closed (when the switch SW1 is turned off), step S
Proceed to step 2. In step S2, it is determined whether the cartridge 10 is loaded or not based on the state of the cartridge presence/absence switch SW2. If the cartridge presence/absence switch SW2 is off, it is determined that the cartridge is not loaded and the process is terminated.
If the switch SW2 is on, it is determined that the cartridge is loaded and the process proceeds to step S3.

In step S3, it is determined whether the loaded film 12 is new, has been rewound, or is in the process of being photographed. Here, a new cartridge refers to a cartridge loaded from the start of this program until it is determined in step S1 that switch SW1 is turned off (cassette lid closed), and a cartridge that has already been rewound refers to Film 1
2 indicates rewound. Further, the cartridge in the middle of shooting refers to the one currently being used for shooting, that is, the cartridge from the initial advance of the film until it is rewound as described above. The determination in step S3 may be made, for example, as follows.

That is, two types of flags F1 and F2 are provided in the control circuit 17, and the flag F1 is turned on at the start of rewinding and turned off when the cartridge presence/absence switch SW2 is turned on from off, that is, when the cartridge is loaded. do it like this. Here, the start of rewinding is performed using the above-mentioned winding switch SW.
The determination may be made based on the state of step 4 or whether or not all frames have been photographed. Further, the flag F2 is turned on when the first frame is photographed after the initial feeding of the film 12 is completed, and is turned off when the cartridge presence/absence switch SW2 is turned from on to off, that is, when the cartridge is taken out. According to this, if the loaded film is new, the flag F1,
Both F2 are off, if the film has already been rewound, both are on, and if the film is being shot, flag F1 is off and flag F2 is on, so the state of the film can be determined from the state of flags F1 and F2. can be judged. In addition,
This determination method is just an example, and it goes without saying that other methods may be used.

If it is determined in step S3 that the cartridge has been rewound, the process is terminated, and if it is determined that it is a new cartridge, the process advances to step S4. Step S
4, a fork is driven by a film delivery mechanism (not shown), the spool shaft 11 of the cartridge 10 is rotated, and the film 12 is sent out from the cartridge 10. In step S5, measurement of the film feed amount is started, and then, in step S6, the film 12 is wound around the winding spool 3.

Next, in step S7, the motor 4 is driven via the motor drive circuit 16, the winding spool 3 is rotated via the gears G1 to G4, and winding of the film 12 is started. In step S8, the film feed amount detection circuit 1
3, waits until the amount of film feed from step S5 reaches a predetermined amount, and then stops winding in step S9 to end the process. The operations from steps S4 to S9 described above are the initial film feeding operation, and the amount of film feeding at this time corresponds to the first predetermined amount. Thereafter, when the release switch SW3 is turned on, photographing is performed in another routine, and the film is wound onto the take-up spool 3 one frame at a time each time the photographing of each frame is completed.

On the other hand, if it is determined in step S3 that the loaded cartridge 10 is in the process of being photographed, the process proceeds to step S10, where the winding spool 3 is driven to start winding the film 12. . In step S11, the magnetic head 6 is driven via the magnetic recording circuit 14, and a print prohibition signal is recorded in the magnetic recording area 12b that moves as the film 12 is wound. Next, in step S12, the film 12 is moved by a second predetermined amount (for example, two frames) based on the output from the film feed amount detection circuit 13.
It is determined whether or not it has been wound up, and if it is affirmative, step S
At step 13, the winding is stopped and the process is completed. Thereafter, photography is performed when the release switch SW3 is turned on. Here, this second predetermined amount corresponds to the amount of film exposed by opening the cartridge lid, and is set in advance and stored in the control circuit 17.

According to the above procedure, a new cartridge 1
When the cartridge cover 2 is closed after loading the film 0, the film 12 is fed by a first predetermined amount (initial feeding) in accordance with the closing operation, and the film 12 becomes ready for photography. On the other hand, if the cassette lid 2 is opened during shooting, that is, during the period from the completion of the initial advance until the rewinding of the film, the second cassette lid 2 The film is wound up by a predetermined amount (an amount corresponding to the amount of film exposed by opening the cartridge lid, for example, two frames). As a result, it is possible to reliably continue photographing with unexposed frames, and the film is not wound more than necessary as in the conventional case, thereby preventing wastage of the film.

Furthermore, in the above, when the film 12 is wound by the second predetermined amount, a print prohibition signal is recorded for the corresponding frame. Therefore, by reading this information on the laboratory side, it is possible to prevent the frames exposed by opening the cartridge lid from being undesirably printed.

In the configuration of the above embodiment, the winding motor 4, the winding spool 3, and a fork (not shown) (which can be engaged with the spool shaft of the cartridge 10) control the film feeding means 101, and the control circuit 17. constitute the determination means 102 and the control means 103, respectively.

Note that in the above description, the second predetermined amount corresponding to the amount of film exposed by opening the cartridge lid is set to be two frames of film, but this second predetermined amount corresponds to the amount of film exposed by opening the cartridge lid 10.
It varies depending on the position and size of the camera, the structure and size of the camera body, etc. That is, for example, if the cartridge cover is provided on the back of the camera, the amount of film exposure will be greater when opened during shooting, compared to the case where the cartridge cover is provided on the bottom as in the embodiment. It is necessary to wind up the number of pieces or more. In addition, if the back cover (also included in the cartridge cover) opens and closes the entire back of the camera body like a conventional camera, the amount of film exposure will be even higher if it is opened in the middle of shooting. Requires a large amount of winding. Furthermore, even if the position and size of the cartridge lid are the same, the amount of exposure will vary depending on the width of the camera body. Therefore, the second predetermined amount needs to be appropriately determined depending on how much the film is exposed when the cartridge lid is opened.

-Second Embodiment- Next, a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. In this embodiment, the film is wound to the end when the cartridge lid 2 is closed when the cartridge is loaded, and then the film is rewound one frame at a time each time shooting is completed.
This is applied to a so-called prewind camera. FIG. 5 shows the configuration of the film feeding control device of this camera, which is the same configuration as FIG. 2 except that the photointerrupter 5 and the magnetic head 6 are arranged in different positions.

FIG. 6 shows the control procedure when opening the cartridge lid in this embodiment, and steps similar to those in FIG. 4 are given the same step numbers. In FIG. 6, step S3
'If it is determined that the film is new, step S
The film is fed out in step S4, and then preliminary winding is started in step S5. After that, when it is determined in step S6 that the winding has been completed to the end, the first winding is performed in step S7'.
The frame is made to face the aperture, and the feeding of the film is stopped in step S8'. After step S8', when the release switch SW3 is turned on, photography is performed,
After each frame is photographed, the film is rewound one frame at a time into the cartridge.

On the other hand, if it is determined in step S3' that shooting is in progress, the process proceeds to step S10', where the motor drive circuit 16 drives the motor 4 to start rewinding the film 12, and at the same time, information recording is started in step S11. and
It waits until it is rewound by a predetermined amount in step S12', and then stops rewinding in step S13'. This predetermined amount corresponds to the amount of film exposed by opening the cartridge lid, and is set in advance and stored in the control circuit 17.

[0026] Here, step S3' in this embodiment
The determination can be made as follows. That is, as described above, two types of flags F1 and F2 are provided in the control circuit 17, and the flag F1 is turned on when rewinding of all frames is completed, and when the cartridge presence/absence switch SW2 is turned on from off, that is, when the cartridge is loaded. Turn it off at times. Further, the flag F2 is turned on when the first frame is photographed after winding of all frames of the film 12 is completed, and the cartridge presence/absence switch SW2 is turned on.
When turning from on to off, that is, when taking out the cartridge, it should be turned off. According to this, if the loaded film is new, flags F1 and F2 are both off, if the film has been rewound, both are on, and if the film is in the middle of being shot, flag F1 is off. Since the flag F2 is off and the flag F2 is on, the state of the film can be determined from the states of the flags F1 and F2.

According to the above procedure, a new cartridge 1
When the cartridge cover 2 is closed after loading the film 0, the film 12 is wound up to the end with the closing operation, and becomes ready for photographing. On the other hand, during shooting, that is, after the film 12 has been wound to the end, the film 1
During the period until the last piece of 2 is rewound, the cartridge lid 2
When the cassette lid 2 is subsequently closed, a predetermined amount of film (an amount corresponding to the amount of film exposed by opening the cassette lid, for example, two frames) is inserted into the cassette 10. It is rewound. This results in
To ensure that photographing can be continued with unexposed frames, and to prevent waste of film by preventing the film from being rewound more than necessary. Also, in this embodiment, since a print prohibition signal is recorded, the frames exposed by opening the cartridge cover are prevented from being undesirably printed, as described above.

In the above description, the predetermined amount corresponding to the amount of film exposed by opening the cartridge lid is set to be two frames of film, but this may vary depending on the position and size of the cartridge lid 10, or the structure of the camera body, as described above. , size, etc., so it is necessary to appropriately determine the amount of exposure of the film when the cartridge lid is opened. However, in a prewind camera like the above example, all unexposed frames are pulled out from the cartridge, so
In the case of a back cover that opens and closes the entire back of the camera body, all unexposed frames will be exposed if it is opened during shooting. I have no choice but to give up.

[0029]

According to the invention as claimed in claim 1, in a device which normally adopts the winding method, the cartridge lid is opened during the period from the completion of the initial film feeding until the rewinding of the film. In this case, when the cartridge lid is subsequently closed, the film is wound by a predetermined amount corresponding to the amount of film exposed by opening the cartridge lid, so that it is possible to continue shooting with unexposed frames. At the same time, the film is not wound more than necessary as in the conventional case, and waste of the film is prevented. According to the third aspect of the invention, in a device that employs a prewind system, if the cartridge lid is opened during the period from when the film is wound to the end until the last frame of the film is rewound, With the subsequent closing operation of the cartridge lid, the film is rewound by a predetermined amount corresponding to the amount of film exposed by opening the cartridge lid, so that the same effect as described above can be obtained.

[Brief explanation of drawings]

FIG. 1 is a complaint correspondence diagram.

FIG. 2 is a schematic rear view of the camera according to the first embodiment.

FIG. 3 is a diagram showing the configuration of a film feeding control device for a camera according to the present invention.

FIG. 4 is a flowchart of a processing procedure.

FIG. 5 is a diagram showing the configuration of a film feeding control device according to a second embodiment.

FIG. 6 is a flowchart of a processing procedure.

[Explanation of symbols]

1 Camera body 2. Patrone lid 3 Winding spool 4 Film feeding motor 5 Photo interrupter 6 Magnetic head 11 Control circuit 12 Motor drive circuit 13 Film feed amount detection circuit 14 Magnetic recording circuit 15 Exposure control circuit 101 Film feeding means 102 Judgment means 103 Control means SW1　Patrone lid detection switch SW2 Patrone presence/absence switch SW3 Release switch SW4 Rewind switch

Claims (4)

[Claims] 1. A film feeding means, which feeds a first predetermined amount of film in accordance with the closing operation of the cartridge lid after loading the cartridge, and then winds the film one frame at a time after each frame is photographed. In the film feeding control device of the camera that winds the film onto the upper spool, whether or not the cartridge lid is opened during the period from the completion of feeding the first predetermined amount of film until the film is rewound. and, if it is determined that the cartridge lid has been opened during the period, a second position corresponding to the amount of film exposed by opening the cartridge lid, in accordance with the subsequent closing operation of the cartridge lid. 1. A film feeding control device for a camera, comprising: control means for controlling the film feeding means so as to wind the film by a fixed amount. 2. The camera according to claim 1, further comprising recording means for recording a print prohibition signal for a winding frame when the film is wound by the second predetermined amount. film feeding control device. 3. A camera comprising a film feeding means, which winds the film to the end when the cartridge lid is closed after loading the cartridge, and then rewinds the film one frame at a time into the cartridge after each frame is photographed. In the film feeding control device, a determination means for determining whether or not a cartridge lid is opened during a period from when the film is wound to the end until the last frame of the film is rewound; When it is determined that the lid has been opened, the film feeding means is controlled to rewind the film by a predetermined amount corresponding to the amount of film exposed by opening the cartridge lid in accordance with the subsequent closing operation of the cartridge lid. 1. A film feed control device for a camera, comprising: a control means. 4. The camera film according to claim 3, further comprising recording means for recording a print prohibition signal for a rewind frame when rewinding the film by the predetermined amount. Feeding control device.