JPH09189954A - Film feeder for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film feeder for a camera capable of surely executing magnetic recording by making the traveling of a film uniform and further, shortening an operation time for feeding and taking up the film. SOLUTION: The number of the frames capable of being photographed of the film 48 in a cartridge 46 is read by a bar code detecting circuit 58 and further, a feeding speed by a feeding means is set slower than a speed for taking up the film 48 by a take-up means, to let out the film 48 from the cartridge 46 and feed the film 48 to the side of a spool 10. When the cartridge 46 is loaded in the camera and it is judged that the number of the frames capable of being photographed of the film 48 is smaller than the fixed number of the frames by the bar code detecting circuit 58, a CPU 30 executes the extra no-load feeding of a fixed no-load feed rate larger than a no-load feed rate and then, the rewinding of the extra no-load feed rate in the cartridge 46 again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding device of a camera for feeding a film with a magnetic storage unit when writing information to the magnetic storage unit of the film.

[0002]

2. Description of the Related Art Conventionally, for example, according to Japanese Patent Application Laid-Open No. 2-67534, a film spool is rotated in order to rotate the film spool in the cartridge so as to feed the film from the cartridge and wind the film on a take-up spool. A method is described in which the reduction gear ratio of the returning gear train is set to be larger than that of the film winding gear train.

Further, according to Japanese Patent Laid-Open No. 4-128732, the output when the roller member is positioned on the film surface during film feeding is supplied as a signal for instructing recording of information, and the roller member A method is described in which magnetic information is written on a film by supplying an output when the film is located at the perforation of the film as a signal for frame positioning. Then, these methods have been combined to try to accurately write magnetic information in the magnetic storage portion of the film.

[0004]

However, when magnetic information is written on a film using the above method,
In particular, there is a case in which the running of the film, that is, the running amount and the running speed become uneven between the shooting start frame and the initial shooting frame when the film is loaded, and normal magnetic information writing may not be performed.

It is considered that this phenomenon will occur frequently (prominently) especially when a film cartridge having a small number of frames that can be photographed is loaded in the camera. this is,
In the case of a cartridge with a small number of frames, the shaft diameter of the spool in this cartridge must be larger than the diameter of the spool around which the film with a large number of frames is wound in order to prevent film curling within the cartridge. This is because it is considered that it will not happen. For this reason, the feeding speed of the film of the cartridge having a small number of shooting frames is faster than the feeding speed of the cartridge having a large number of shooting frames, whereby the film wound around the winding shaft is rotated between the films during the winding rotation. Moves relatively,
This is because it is considered that the film does not become loose around the winding shaft and is hard to be reliably wound.

FIG. 6 is a diagram showing an experimental phenomenon obtained with the same configuration as in Japanese Patent Laid-Open No. 2-67534, in which the graph 100 above shows the current flowing through the film winding motor, and the graph 100 below. Graph 102 in FIG. 2 is a pulse indicating the film running. In the graph 102 showing the running of the film, there are many portions where the pulse width is not uniform. This indicates that the film is not running uniformly. Then, it is considered that this phenomenon becomes more remarkable as the shaft diameter of the spool in the cartridge becomes thicker as described above.

Therefore, the present invention has been made to solve the above problems, and only when the number of photographable frames of the film in the cartridge is less than a predetermined number, rewind the film once wound into the cartridge. It is therefore an object of the present invention to provide a film feeding device for a camera that can reliably wind a film around a film take-up shaft without slack to make the film run uniformly and reliably perform magnetic recording.

[0008]

In order to achieve the above object, the film feeding apparatus for a camera of the present invention uses a cartridge containing a film with a magnetic storage unit therein and having information on the number of frames that can be photographed. , Which has a magnetic head, sends out the film from the cartridge, and it is possible to write information to the magnetic storage part of the film while winding the film on the film take-up spool. A camera for reading the number of photographable frames of the film of the cartridge, a driving unit for moving the film, and a driving force of the driving unit to wind the film. And when receiving a driving force in the opposite direction of the driving force, a winding means that does not receive this driving force,
In order to feed the film from the cartridge in response to the driving force of the driving means and further feed the film to the winding means side, the feeding speed is made slower than the winding speed of the winding means. Means and
When the number of photographable frames of the film in the cartridge is determined to be smaller than the predetermined number of frames by the photographing frame number reading means after the cartridge is loaded in the camera, the predetermined frame feed amount larger than the blank feed amount. And the control means for rewinding the excess idle fed amount into the cartridge again.

Further, in the film feeding apparatus of the camera of the present invention, the control means again performs the rewinding operation of rewinding the extra idly fed amount into the cartridge, and then further winds the film. The feature is that it is set as the first frame of shooting.

Further, the film feeding device of the camera of the present invention is a camera in which a film having a magnetic storage portion is contained and a cartridge having a function of sending out the film can be loaded, and the filming operation recorded in the cartridge is performed. Information reading means for reading information on the number of possible frames, detection means for detecting loading of the cartridge, and when the information on the number of photographable frames read by the information reading means is less than a predetermined number, When the loading of the cartridge is detected, an idling means for performing the idling operation of the film by a predetermined number of frames larger than the number of idling frames,
After the end of the idling operation by the idling means, there is provided rewinding means for performing an unwinding operation up to the position of the first frame of the film by a number smaller than the predetermined number of frames.

That is, in the film feeding device of the camera, when the number of photographable frames of the film of the cartridge is read by the photographing frame number reading means and the forward driving force of the driving means is received, the rewinding means is used. Although the film is wound up, when the driving force in the opposite direction of the driving means is received, the driving force is not transmitted to the winding shaft by the winding means. Further, in order to feed the film from the cartridge in response to the driving force of the driving means and feed the film to the winding means side, the feeding speed is higher than the speed at which the winding means winds the film. Will be slowed down. When the number of photographable frames of the film in the cartridge is determined to be less than the predetermined number of frames by the photographing frame number reading means after the cartridge is loaded in the camera, the control unit feeds the jump feed amount. After an extra idling of a predetermined larger idling amount than the above, the extra idling amount is rewound into the cartridge again.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view showing the mechanical structure of the film feeding device of the camera according to the embodiment of the present invention.

The mechanical structure for feeding the film in the film feeding device of this camera is the same as that disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-67534.
That is, the feeding device of this camera has a film feeding motor 14 as a single driving source for driving the film winding shaft (winding spool) 10 and the rewinding shaft 12, and further, the film feeding motor. Motor 14 and winding shaft 10
And a gear train 18 that connects the film feeding motor 14 and the rewinding shaft 12. The former gear train 16 has a lower gear ratio than the latter gear train 18, and the film winding speed by the winding shaft 10 is
It is set to be faster than the delivery speed delivered from the cartridge by the rewind shaft 12.

A one-way clutch 16a is present in the gear train 16, and the one-way clutch 16a is used for winding the film.
4 is transmitted to the take-up shaft 10, otherwise the drive force of the film feed motor 14 is not transmitted to the take-up shaft 10 when the film moves away from the take-up shaft 10. Work on.

The gear train 18 has a sun gear 18 in the middle thereof.
a and a planetary lever 18c composed of a planetary gear 18b. The sun gear 18a meshing with the planet gear 18b
The driving force of the film feed motor 14 is transmitted to the motor. Driven gear 2 driven by planetary gear 18b
Two 0 and 22 are provided in front of the planetary gear 18b depending on the rotation direction of the film feeding motor 14.
Is engaged with the driven gears 20 and 22.

On the other hand, the driven gear 20 drives a fork member 26 as the rewinding shaft 12 via a one-way clutch 24. When the driving force of the film feed motor 14 for feeding the film from the cartridge is transmitted to the driven gear 20, the one-way clutch 24 connects the driven gear 20 and the fork member 26, and feeds the film from the cartridge. However, when the film is pulled out of the cartridge at a speed higher than the feeding speed, the connection of the one-way clutch 24 is disconnected,
This pulling force is not transmitted to the driven gear 20.

The other driven gear 22 is connected to the fork member 26 via another gear train 28. This transmission mechanism functions when the driving force of the film feed motor 14 for rewinding is transmitted to the planetary gear 18b.

Next, a description will be given of the film idling, film winding and rewinding operations during normal photographing in the camera film feeding apparatus thus constructed. When the film feeding motor 14 is rotated in one direction for feeding the film, this rotation drives the gear train 16,
The winding shaft 10 is driven. At the same time, the gear train 18 is also driven, the planetary gear 18b meshes with the driven gear 20, and the fork member 26 is rotated via the rewind shaft 12 to feed the film.

When the film is sent out and taken up by the take-up shaft 10, the take-up speed of the take-up shaft 10 is faster than the take-out speed of the rewinding shaft 12, so that the driven gear 20 and the fork member 26 are separated from each other. In the meantime, the one-way clutch 24 is disconnected,
Only the fork member 26 rotates. Even when winding up after normal photographing, the fork member 26 rotates by the same operation.

At the time of rewinding, the film feeding motor 14 is rotated in the direction opposite to the above-described winding and winding. Then, the driving force transmitted to the driven gear 16b does not rotate the winding shaft 10 because the driven gear 16b and the winding shaft 10 are disconnected from each other by the one-way clutch 16a. On the other hand, when the film feeding motor 14 rotates in the direction opposite to that at the time of winding, the planet gear 18b and the driven gear 22 mesh with each other. Thus, the driving force transmitted from the film feed motor 14 to the planet gears 18 b of the gear train 18 is transmitted to the driven gear 22, and further causes the fork member 26 to rewind in the rewind direction via the gear train 28. Rotate to. Then, the film is rewound by the rotation of the fork member 26.

FIG. 1 is a block diagram showing a circuit configuration of a camera to which the film feeding apparatus is applied. An operation control unit (hereinafter referred to as CPU) 30 is the center of operation control in this camera, and various circuits and mechanisms for performing camera operation are connected and arranged around the CPU 30. Then, it operates according to the instruction of the CPU 30 or C
It provides information to the PU 30.

The distance measuring circuit 32 is for measuring the distance to the subject, and the measured distance information of the subject is stored in the CPU 3
Input to the CPU 30 via the input port I4 of 0. The photometric circuit 34 measures the luminance of the subject, and the measured luminance information of the subject is input to the input port I5 of the CPU 30.
Input to the CPU 30 via.

The CPU 30 controls the shutter / aperture control circuit 36 to perform the exposure operation according to the inputted luminance information, and controls the focus adjustment circuit 38 to perform the focus adjustment operation according to the distance information. To do. In this focus adjustment operation, when the photographer half-presses the release button, the CPU 30 detects via the input port I1 that the first release switch (1st. If executed. Also,
In the exposure operation, when the photographer fully presses the release button, the second release switch (2nd. Release SW) 42 that is turned on in synchronization with this is turned on.
It is executed when U30 detects it through the input port I2.

Further, the storage chamber lid switch (SW) 44
Is a switch that is turned on when the film cartridge 46 is loaded in the accommodation chamber of the camera body and the lid of the accommodation chamber is closed. When the CPU 30 detects that the switch is turned on through the input port I3. The feeding operation of the film 48 is started.

The film 48 wound in the film cartridge 46 is sent out of the film cartridge 46 by rotating a spool shaft (not shown) in the film cartridge 46. This feeding operation is performed by the film feeding motor 14 and the gear train 18 for rotating the spool shaft by the driving force.
The driving is performed by a driven mechanism including the driven gear 20, the fork member 26, and the like. The driving force of the film feed motor 14 is also transmitted to the take-up spool 10 at the same time.
When the fed film 48 reaches the take-up spool 10, the film 48 is taken up by the take-up spool 10.

Since the peripheral speed V1 at which the film 48 is sent out from the film cartridge 46 and the peripheral speed V2 when the film 48 is wound by the take-up spool 10 are normally set to V1 <V2, After the film 48 is wound on the take-up spool 10, the film 48 is fed by the take-up spool 10. The film feeding motor 14 is driven by a motor drive circuit 50, and the CPU 30 is driven through an output port O3 of the CPU 30.
Is controlled by

The film cartridge 46 is provided with a disc 52 which is interlocked with the rotation of the spool shaft in the film cartridge 46, and a bar code 54 is printed on the disc 52. The bar code 54 encodes information relating to the characteristics of the film 48 and the film cartridge 46. By discriminating the bar code 54, the film sensitivity information, the number of photographed frames information,
You can get negative / positive information. Also, depending on the initial position, it is possible to detect the exposure state of the film 48, that is, whether or not the built-in film has already been exposed.

The information recorded on the bar code 54 is read out by the photo sensor 56 while rotating the disc 52 fixed to the spool shaft in the direction opposite to the feeding direction of the film 48. . The photo sensor 56 is a photo reflector that emits light onto the disk 52 and receives the reflected light, and detects a change in the amount of reflected light caused by the presence or absence of the bar code 54. The bar code detection circuit 58 converts the analog output of the photo sensor 56 into a digital pulse, and inputs it to the input port I of the CPU 30.
It inputs to CPU30 via 7. The CPU 30 decodes this digital pulse to determine the above information.

Further, the mechanism for detecting the feeding state of the film 48 is a driven roller 6 which is driven by the film 48 to rotate.
0, and an encoder plate 62 that interlocks with the driven roller 60
And a photo sensor 64 for detecting a slit provided on the encoder plate 62, and a feeding state detection circuit 66 for converting the analog output of the photo sensor 64 into digital pulses. Then, the CPU 30 uses the input port I6
The feeding amount of the film 48 is detected by receiving the digital pulse from the feeding state detecting circuit 66 via the, and counting the number.

Further, the film 48 has a magnetic recording portion (not shown) extending in the longitudinal direction thereof so that photographing information and the like can be recorded. This recording is performed as follows. The CPU 30 supplies a magnetic recording signal to the magnetic head drive circuit 68 via the output port O4 in synchronism with the digital pulse for detecting the film feeding state input via the input port I6. And
The magnetic head drive circuit 68 receives the magnetic recording signal and drives the magnetic head 70 to record magnetic information in the magnetic recording section.

Next, the processing of the CPU 30 as the operation of the feeding device of this camera will be described with reference to the flow chart shown in FIG. When the CPU 30 detects that the storage chamber lid SW44 is turned on, the main routine (not shown)
To enter this "autoload" routine.

First, the CPU 30 reversely drives the film feeding motor (M) 14 to rotate the spool shaft in the film cartridge 46 in the direction opposite to the film feeding direction, and the photo sensor 56 and the bar code detecting circuit 58. The information recorded in the bar code is read using (step S1).

Here, the CPU 30 determines whether or not the initial position of the bar code is at the position indicating the unexposed state (step S2). If it is not unexposed, it warns that it has already been exposed (step S9) and returns to the main routine. On the other hand, when it is not exposed, the motor drive circuit 50 is instructed to rotate the film feeding motor 14 in the normal direction (step S3).

Next, the CPU 30 monitors the feeding amount of the film 48 from the pulse signal input to the input port I6 via the driven roller 60, the encoder plate 62, the photo sensor 64, and the feeding state detection circuit 66. . When the nth frame of the film 48 is fed to the exposure position, the film feeding motor 14 is once stopped (steps S4 and S5). Subsequently, the film feeding motor 14 is rotated in the reverse direction to load the film 48 into the film cartridge 46.
It is rewound inside (step S6).

Then, the CPU 30 monitors the feed amount of the film 48 from the pulse signal input to the input port I6, and judges whether the first frame of the film 48 has returned to the exposure position (step S7), 1 When the frame returns to the exposure position, the film feeding motor 14 is stopped (step S8). After that, this routine is terminated and returns to the main routine.

The number n of frames to be wound in step S4 is the number of frames required for the film 48 to be tightly wound around the take-up spool 10, and is a value to be determined experimentally. Whether the nth frame and the first frame of the film 48 have been fed to the exposure position in steps S4 and S7 is determined by the driven roller 60, the encoder plate 62,
Although the pulse signal output from the photo sensor 64 and the feeding state detection circuit 66 is used, the determination may be made by detecting the position of the perforation provided on the film 48. Further, in the flow chart shown in FIG. 3, after feeding the nth frame to the exposure position and stopping the film feeding motor 14, the film feeding motor 14 is rotated in the reverse direction to move the first frame to the exposure position. However, when the nth frame is fed to the exposure position without returning the first frame to the exposure position, the process may return to the main routine to record and reproduce the magnetic information.

Next, referring to the flowchart shown in FIG. 4, the CPU 3 as a modified example of the operation of the feeding device of this camera.
The process of 0 will be described. This modified example is an example in which the operation is controlled based on the number-of-photographed frames information in the information recorded in the barcode 54.

The processes of steps S1, S2 and S9 are the same as the processes in the flowchart shown in FIG. When the photographic frame has not been exposed in step S2, the CPU 30 determines whether the film cartridge 46 has a small number of photographic frames (step S10). When the film cartridge 46 having a small number of frames to be photographed is loaded, the n-th frame is once fed (steps S3, S4, S5) and then the first frame is wound, as in the process of the flowchart shown in FIG. Return (steps S6, S7, S8). Then, this routine is finished and returns to the main routine.

On the other hand, when the film cartridge 46 having a small number of frames is loaded in step S10, the CPU 30 rotates the film feeding motor 14 in the normal direction (step S11), and then feeds the film 48. The amount is monitored, and when the first frame is fed to the exposure position, the film feeding motor 14 is stopped (steps S12 and S1).
3). After that, this routine is terminated and returns to the main routine.

Such operation control is carried out when a film cartridge having a small number of frames for photography causes unevenness in the running of the film and a more remarkable problem that normal magnetic information cannot be written. Because it is expected. As a result, when a film cartridge that is not a film cartridge with a small number of frames, that is, a film cartridge with a large number of frames is loaded into the camera,
The operating time for film feeding and winding can be shortened.

The number n of frames wound in step S4 is the number of frames required for the film 48 to be tightly wound around the take-up spool 10, and is a value to be determined by experiment. Whether the nth frame and the first frame of the film 48 have been fed to the exposure position in steps S4 and S7 is determined by the driven roller 60, the encoder plate 62,
Although the pulse signal output from the photo sensor 64 and the feeding state detection circuit 66 is used, the determination may be made by detecting the position of the perforation provided on the film 48. Further, in the flow chart shown in FIG. 4, after feeding the n-th frame to the exposure position and stopping the film feeding motor 14, the film feeding motor 14 is rotated in the reverse direction so that the first frame is exposed to the exposure position. However, when the nth frame is fed to the exposure position without returning the first frame to the exposure position, the process may return to the main routine to record and reproduce the magnetic information.

Next, referring to the flow chart shown in FIG. 5, a CP as another modification of the operation of the feeding device of this camera.
The processing of U30 will be described. The processing of steps S1 to S6 and step S9 is the same as the processing in the flowchart shown in FIG. After winding up to the nth frame, the film feeding motor 14 is reversed in step S6 to rewind the film 48 into the film cartridge 46 (step S6).
0 monitors the feeding amount of the film 48, and judges whether the -1st frame has been rewound to the exposure position (step S).
101). Then, when the -1st frame is rewound to the exposure position, the film feeding motor 14 is stopped (step S102).

Subsequently, the CPU 30 waits for 100 ms (step S103), and then the film feeding motor 1 again.
4 in the normal direction (step S104), and 1 of the film 48
It is determined whether or not the frame has been fed to the exposure position (step S7). When the first frame is fed to the exposure position, the film feeding motor 14 is stopped (step S8). After that, this routine is terminated and returns to the main routine.

That is, in the operation control shown in FIGS. 3 and 4, after winding up to the nth frame, the first frame is rewound so as to be located at the photographing position. Rewind from the first frame to the -1st frame as shown in 100
After waiting for ms, the first frame may be wound up again. Thereby, the film can be more reliably wound around the take-up spool.

Incidentally, the above steps S101 to S10.
The processes up to 4 can be applied to the flowcharts shown in FIGS. 3 and 4. As for the number n of frames to be wound up in step S4, the film 48 is wound on the spool 1
It is the number of frames required to tightly wrap around 0, and is a value that should be determined by experiment. Whether the nth frame and the first frame of the film 48 have been fed to the exposure position in steps S4 and S7 is determined by the driven roller 60, the encoder plate 62, the photosensor 64, and the feeding state detection circuit 6.
Although it is performed by the pulse signal output via 6, it may be determined by detecting the position of perforation provided on the film 48. Further, in the flow chart shown in FIG. 5, after feeding the n-th frame to the exposure position and stopping the film feeding motor 14, the film feeding motor 14 is rotated in the reverse direction so that the first frame is exposed. Back up to
It is also possible to return to the main routine to record and reproduce magnetic information when the nth frame is fed to the exposure position without returning the first frame to the exposure position.

As described above, according to the above-mentioned embodiment, the film once wound is rewound into the film cartridge, and the film is firmly wound around the film winding shaft, that is, the film winding shaft and the film winding shaft are wound. By winding up the film so that there is no gap between the film and the film, the running of the film is made uniform and the recording of magnetic information in the magnetic storage part of the film is ensured. Can be done.

According to the above embodiment of the present invention, the following constitution can be obtained. (1) A film having a magnetic storage unit is contained therein, a cartridge having information on the number of frames that can be photographed is used, a magnetic head is provided, the film is sent from the cartridge, and the film is wound on a film winding spool. In a camera capable of writing information to the magnetic storage portion of a film and automatically feeding in a blank when the cartridge is loaded, a photographing frame number reading means for reading the number of photographable frames of the film of the cartridge, and a driving means. When the drive force of the drive means is received to wind the film, and when the drive force in the opposite direction of the drive force is received, the winding means that does not receive the drive force and the drive force of the drive means In order to receive and send out the film from the cartridge, and further to send the film to the winding means, The number of photographable frames of the film in the cartridge is determined by a predetermined number of frames by the sending-out unit which is slower than the speed at which the film is wound by the winding unit and the number of photographing frames reading unit after the cartridge is loaded in the camera. When it is determined that the amount is smaller, the predetermined idle feed amount larger than the idle feed amount is additionally idled, and then the excess idle feed amount is rewound into the cartridge again. Film feeding device for camera. (2) A film having a magnetic storage unit is contained therein, a cartridge having information on the number of photographable frames is used, a magnetic head is provided, the film is sent from the cartridge, and the film is wound on a film winding spool. In a camera capable of writing information to the magnetic storage portion of a film and automatically feeding in a blank when the cartridge is loaded, a photographing frame number reading means for reading the number of photographable frames of the film of the cartridge, and a driving means. When the drive force of the drive means is received to wind the film, and when the drive force in the opposite direction of the drive force is received, the winding means that does not receive the drive force and the drive force of the drive means In order to receive and send out the film from the cartridge, and further to send the film to the winding means, The number of photographable frames of the film in the cartridge is determined by a predetermined number of frames by the sending-out unit which is slower than the speed at which the film is wound by the winding unit and the number of photographing frames reading unit after the cartridge is loaded in the camera. If it is determined that the number is less than the above, an extra idling amount larger than the above idling amount is extra idly fed, and then the extra idling amount is rewound into the cartridge again, and the film is further wound and photographed. A film feeding device for a camera, which is set to the first frame. (3) In a camera in which a film having a magnetic recording portion is included and a cartridge having a function of sending out this film can be loaded, information reading means for reading information on the number of photographable frames recorded in the cartridge, and loading of the cartridge And the number of photographable frames read by the information reading unit is smaller than a predetermined number of frames, the number of frames is larger than the number of idle feed frames when the detection of the cartridge is detected by the detecting unit. An idle feed means for performing the idle feed operation of the film by a predetermined number of frames, and after the idle feed operation by the idle feed means is finished, rewinding to the position of the first frame of photographing of the film by a number smaller than the predetermined number of frames A film feeding device for a camera, comprising: a rewinding means for performing an operation. (4) The information reading means has an optical information reading means for reading information provided in the film cartridge, and after the information is read by the optical information reading means, the camera is set to the empty state. The film feeding device for a camera according to (3) above, which performs a feeding operation. (5) The film feeding device for a camera according to (3), further including a magnetic head unit for recording / reading information on / from the magnetic recording unit. (6) In a camera using a film with a magnetic recording section, after being wound up by the number of frames exceeding the first frame for photographing at the time of idle feeding, the film can be photographed after rewinding to the first frame for photographing. Film feeding device for camera.

[0048]

As described above, according to the present invention, only when the number of photographable frames of the film in the cartridge is smaller than the predetermined number, the film which has been wound up is rewound into the cartridge to form the film. By reliably winding the film around the winding shaft without slack, the film can be run uniformly and magnetic recording can be reliably performed.
It is possible to provide a film feeding device for a camera that can shorten the operation time for film feeding and film winding.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a camera to which a film feeding device for a camera according to an embodiment of the present invention is applied.

FIG. 2 is a perspective view showing a mechanical structure of a film feeding device of the camera.

FIG. 3 is a CPU 3 as an operation of the feeding device of the camera.
It is a flowchart which shows the process of 0.

FIG. 4 is a flowchart showing a process of a CPU 30 as a modified example of the operation of the camera feeding device.

FIG. 5 is a flowchart showing a process of a CPU 30 as another modified example of the operation of the camera feeding device.

FIG. 6 is a diagram showing that the film does not run uniformly.

[Explanation of symbols]

10 ... Take-up spool (film take-up shaft), 12
... Rewinding shaft, 14 ... Film feeding motor, 16 ... Gear train, 16a ... One-way clutch, 16b ... Driven gear, 18 ... Gear train, 18a ... Sun gear, 18b ... Planetary gear, 18c ... Planetary lever, 20 , 22 ... Driven gear, 2
4 ... One-way clutch, 26 ... Fork member, 28 ...
Gear train, 30 ... Calculation control unit (CPU), 32 ... Distance measuring circuit, 34 ... Photometric circuit, 36 ... Shutter / aperture control circuit,
38 ... Focus adjustment circuit, 40 ... First release switch (1st. Release SW), 42 ... Second release switch (2nd. Release SW), 44 ... Housing chamber lid switch (SW), 46 ... Film cartridge, 48
... film, 50 ... motor drive circuit, 52 ... disk, 54
... bar code, 56 ... photo sensor, 58 ... bar code detection circuit, 60 ... driven roller, 62 ... encoder plate, 6
4 ... Photo sensor, 66 ... Feeding state detection circuit, 68 ... Magnetic head drive circuit, 70 ... Magnetic head.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Asakura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Shinya Takahashi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Yasuo Tanbara 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Takeshi Ishino 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (3)

[Claims] 1. A film having a magnetic storage unit is contained therein, a cartridge having information on the number of frames that can be photographed is used, a magnetic head is provided, the film is sent from the cartridge, and the film is wound on a film take-up spool. In a camera capable of writing information to the magnetic storage portion of the film while taking the film, and automatically feeding the film when the cartridge is loaded, in the camera, a photographing frame number reading means for reading the number of photographable frames of the film of the cartridge, Driving means for moving the film, and winding means for receiving the driving force of the driving means to wind the film and not receiving the driving force in the opposite direction of the driving force. Receiving the driving force of the driving means, the film is sent out from the cartridge, and the film is further wound. In order to feed the film to the side, the feeding means having a speed lower than the winding speed of the film by the winding means, and the photographing frame number reading means after the cartridge is loaded in the camera If it is determined that the number of frames that can be photographed on the film is less than the specified number of frames, an extra specified idle feed amount greater than the above idle feed amount is fed, and then the excess feed amount is rewound into the cartridge. A film feeding device for a camera, comprising: a control means for returning the film. 2. The control means, after performing the rewinding operation for rewinding the extra idle feed amount into the cartridge again, further winds the film and sets it as the first frame of photographing. The film feeding device for a camera according to claim 1. 3. A camera, which can be loaded with a cartridge having a film with a magnetic storage unit and having a function of sending out the film, an information reading means for reading information on the number of photographable frames recorded in the cartridge, and the cartridge. Detection means for detecting the loading of the cartridge and the number of idle feed frames when the loading of the cartridge is detected by the detection means when the number of photographable frames read by the information reading means is less than the predetermined number of frames. An idling means for performing the idling operation of the film by a predetermined number of frames larger than that, and after the idling operation by the idling means is completed, up to the position of the first frame of photographing of the film, by the number of frames less than the specified number of frames. A film feeding device for a camera, comprising: a rewinding unit for performing a rewinding operation.