JPH0950073A - Film feeding device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely feed the film of a film cartridge which is not provided with a tongue and to surely execute a magnetic recording action on the film at a feeding time. SOLUTION: This device is provided with photosensors 5 and 6 installed at the perforation passing position of the film and set for outputting the signal of a level corresponding to received light quantity, a perforation detection means 1 comparing the signals outputted by the sensors 5 and 6 with a threshold value and detecting the perforation of the film and film feeding means 1, 7 and 9 feeding the film based on the detected result of the perforation by the detection means 1. Then, the threshold value is set by the detection means 1 based on the levels of the signals outputted by the sensors 5 and 6 when the film is set at the detecting positions of the sensors 5 and 6 and when it is not set at the positions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding device for a camera which uses a non-veloped film cartridge.

[0002]

2. Description of the Related Art At present, a widely used film cartridge is in a so-called tongue-out state in which the leader portion of the film is out of the cartridge when no image is picked up. In place of such a tongue out film cartridge, a film cartridge in which no tongue out is formed, that is, a film cartridge in which the film is completely contained in the cartridge is proposed (for example, Japanese Patent Laid-Open No. Hei 5 (1999) -58242).
No. 313334). This type of drop-in-loading type film cartridge that does not produce a tongue has the following features as compared to the film cartridge that presently presents a tongue. (1) When handling the cartridge as a single unit, the film is always completely contained in the cartridge, and the tongue does not come out. (2) A data disk is provided for displaying information such as IS0 sensitivity and the number of frames and information such as unexposed film, partially exposed film, exposed film, and developed film. (3) Information other than images related to shooting such as shooting date and time, screen size such as panorama, shooting conditions, and the like can be magnetically recorded on the film. (4) The number and position of perforations are defined for the shooting frame.

The data disk is formed integrally with the film spool in the film cartridge, and when the spool rotates with the film feeding, the data disk also rotates. Information relating to the film such as ISO sensitivity and the number of frames is recorded on the data disk as a bar code, and the information is read by the sensor from the rotating data disk. Further, the stop position of the data disk can be adjusted according to the use state of the film, and the use state of the film such as unexposed, exposed, halfway exposed can be displayed. In addition, the halfway exposure means taking out the film from the camera while leaving the unexposed frame in the middle of shooting.

FIG. 11 shows a leader portion of a film sent out from a tongueless film cartridge. In this film 21, two perforations are formed at the front end and the rear end of each shooting screen on one side of the film,
The positional relationship between them is specified. An extra perforation 18 is formed on the leader side of the perforation 17 at the front end of the first shooting frame 16. A cutout 15 is formed in the leader portion of the film. The perforation on the film 21 is detected by a sensor such as a photo reflector, and the film is fed while detecting the perforation.
Further, the film 21 is coated with a magnetic recording medium, and the photographing information for each frame can be magnetically recorded using a magnetic head. During the winding of one frame after the shooting operation, the write signal is output from the magnetic head at a predetermined cycle,
Imaging information is written at a predetermined recording density.

[0005]

However, the film feeding device for a camera using the above-mentioned tongueless film cartridge has the following problems. The perforation detection sensor traces the line indicated by the alternate long and short dash line in FIG. 11 when the film is fed.
There is a problem that 5 is mistaken for perforation.

Further, since the output of a perforation detecting sensor such as a photo reflector is an analog voltage, it is necessary to determine the output voltage level by providing a threshold value. However, since the amount of reflection on the surface differs for each film, if the threshold value is kept constant, an appropriate level judgment cannot be made depending on the film, and the perforation detection accuracy varies from film to film, and the film feeding accuracy decreases. There is.

Furthermore, since the film feeding speed varies from frame to frame when one frame is wound after photographing, the recording density of information may fluctuate and reproduction may become difficult.

An object of the present invention is to accurately feed a film of a tongue-less film cartridge and to surely record magnetically on the film at the time of feeding.

[0009]

[Means for Solving the Problems]

(1) In order to achieve the above-mentioned object, the invention of claim 1 provides a photosensor that is installed at a perforation passage position of a film and outputs a signal of a level according to the amount of received light, and an output signal of the photosensor. A perforation detecting means for detecting the perforation of the film in comparison with a threshold value, and a film feeding means for feeding the film based on the perforation detection result by the perforation detecting means, and by the perforation detecting means, The threshold value is set based on the output signal level of the photo sensor when the film is present at the detection position of the photo sensor and when the film is not present. A threshold value is set based on the output signal level of the photo sensor when the film is present at the detection position of the photo sensor and when the film is not present, and the perforation of the film is detected by comparing the output signal of the photo sensor with the threshold value. Then, the film is fed based on the detection result of the perforation. (2) A film feeding device for a camera according to a second aspect of the present invention comprises a first photosensor arranged on the cartridge side in the film feeding direction and a second photosensor arranged on the winding spool side of the camera in the film feeding direction. A photo sensor, and compares the output signal of the second photo sensor with a preset temporary threshold value when the film is fed from the cartridge by the film feeding means by the perforation detection means. Then, the leading edge of the film is detected. When the film is sent out from the cartridge, the output signal of the second photosensor arranged on the winding spool side of the camera in the film feeding direction is compared with a preset temporary threshold value to detect the leading edge of the film. . (3) In the film feeding device for a camera according to claim 3, the output signal level of the first photosensor before the film is fed from the cartridge by the film feeding means by the perforation detection means, The threshold value of the first photosensor is set based on the output signal level of the first photosensor at the time when the leading edge of the film is detected at the detection position of the second photosensor. Is. Based on the output signal level of the first photo sensor before the film is sent out from the cartridge and the output signal level of the first photo sensor at the time when the leading edge of the film is detected at the detection position of the second photo sensor The threshold value of the first photo sensor is set. (4) In the film feeding device according to claim 4, the output signal level of the second photo sensor before the film is fed from the cartridge by the film feeding means by the perforation detection means, and the first The threshold value of the second photosensor is set based on the output signal level of the second photosensor at the time when the perforation of the film is detected at the detection position of the photosensor. is there. Based on the output signal level of the second photo sensor before the film is sent out from the cartridge and the output signal level of the second photo sensor at the time when the perforation of the film is detected at the detection position of the first photo sensor ,
The threshold value of the second photo sensor is set. (5) The film feeding device for a camera according to claim 5, wherein the film has a cutout at a position where the first and second photosensors pass a predetermined distance from the front end, and the first photosensor The distance between the second photo sensor and the second photo sensor is longer than the predetermined distance. According to a sixth aspect of the present invention, in the film feeding device for a camera, the threshold value is stored in the non-volatile storage means. (7) In the film feeding device for a camera according to claim 7, when the film feeding means feeds the photographing frame to a predetermined photographing position, the perforation edge is detected a predetermined number of times at the detection position of the second photo sensor. When it is detected, the feeding of the film is stopped. When the photographing frame is fed to a predetermined photographing position, if the perforation edge is detected a predetermined number of times at the detection position of the second photo sensor, the film feeding is stopped. (8) The film feeding device for a camera according to claim 8, wherein when the film feeding unit winds the film, if the perforation detection unit does not detect perforation for a predetermined time or longer, it is determined as a feeding error. It is provided with a judging means. If the perforation is not detected for a predetermined time or more when the film is wound, it is determined that the feeding is abnormal. (9) The film feeding device for a camera according to claim 9, wherein the film feeding means rewinds the film to the cartridge when the film feeding abnormality determination means determines that the film is feeding abnormal, The data disk provided on the disk is set to an unexposed position or an exposed position. When it is determined that the feeding is abnormal at the time of winding the film, the film is rewound into the cartridge and the data disk provided in the cartridge is set to the unexposed position or the exposed position. (10) The film feeding device for a camera according to claim 10,
After the exposure, the perforation detection means 1
When the frame is wound, the film feeding speed is calculated based on the time taken for the perforations to pass through the detection position of the first photo sensor. At the time of winding one frame after exposure, the film feeding speed is calculated based on the time for which the perforation passes the detection position of the first photo sensor. (11) The film feeding device for a camera according to claim 11,
Based on the feeding time of the film calculated by the perforation detecting means, magnetic data is recorded on the film when one frame is wound after exposure. Magnetic data is recorded on the film at the time of winding one frame after exposure, based on the feeding time of the film calculated at the time of winding one frame after exposure. (12) The film feeding device for a camera according to claim 12,
The film is rewound into the cartridge while the perforation is detected by the first photosensor and the perforation detection means. The film is rewound into the cartridge while the perforation is detected by the first photosensor arranged on the cartridge side in the film feeding direction. (13) The film feeding device for a camera according to claim 13 is
The rewinding of the film is stopped when a predetermined time elapses after the perforation is not detected by the first photo sensor and the perforation detecting means by the film feeding means. The rewinding of the film is stopped when a predetermined time elapses after the perforation is no longer detected by the first photosensor arranged on the cartridge side in the film feeding direction. (14) The film feeding device for a camera according to claim 14,
There is provided a photographed number display means for reducing the photographed number display by one each time the film is rewound by one frame by the film feeding means. Each time the film is rewound into a single frame cartridge, the display of the number of shots is reduced by one.

[0010]

FIG. 1 is a block diagram showing the configuration of one embodiment. CPU1 is a counter, timer, A / D
This is a one-chip microcomputer provided with peripheral parts such as a converter, which executes the control programs shown in FIGS. 2 to 8 to perform film feeding and sequence control, as well as various calculations. This CPU1 has LCD2,
The cartridge lid switch 3, release switch 4, sensor T5, sensor M6, motor drive circuit 7, magnetic writing circuit 8 and EEPROM 11 are connected. The LCD 2 is a liquid crystal display such as a film counter for displaying various information. In this embodiment, the film counter of the LCD 2 displays the remaining number of shootable images during shooting. That is, the total number of frames of the film is displayed at the completion of the thrust when the film is fed from the cartridge and the first frame is fed to the shooting position facing the aperture, and then the film counter is decremented each time one frame is shot. When rewinding, the number of remaining frames is displayed. That is, the number of photographed frames is displayed at the start of rewinding, and the film counter is decremented each time one frame is rewound. The cartridge lid switch 3 is closed when the lid of the cartridge chamber is opened, and opened when the lid is closed. The release switch 4 closes when a release button (not shown) is pressed, and controls a photometry circuit, a distance measurement circuit, a shutter drive circuit, etc. (not shown) to perform a series of photographing operations.

The sensor T5 and the sensor M6 are photoreflectors having a light emitter / receiver for optically detecting the perforation of the film, and are arranged at positions facing the perforation of the film. A reflector is attached to the film rail surface facing the sensor T5 and the sensor M6. When there is a film between the sensors 5 and 6 and the rail surface, the light from the light projector is blocked by the film and is not reflected and does not enter the light receiver. When there is no film between the sensor and the rail surface (including the case of the perforation hole position), the light from the light projector is reflected by the reflector and enters the light receiver. The outputs of the sensors 5 and 6 are analog voltages, and the larger the amount of received light, the higher the output voltage. The motor drive circuit 7 performs normal rotation, reverse rotation, and braking of the motor 9 according to a drive command from the CPU 1. The rotation of the motor 9 is transmitted to the film spool of the cartridge and the winding spool of the camera via a feeding mechanism (not shown), and the film is thrust, wound, and rewound as described above. The forward rotation direction of the motor 9 corresponds to the film thrust and winding direction, and the reverse rotation direction corresponds to the film rewinding direction. When the film feeding is stopped, both ends of the motor 9 are short-circuited for braking.

The magnetic writing circuit 8 magnetically records, on a film, photographing information sent from the CPU 1 by the magnetic head 10. FIG. 9 is a circuit diagram of the magnetic writing circuit 8. The resistor 80 is a resistor for limiting the current flowing through the magnetic head 10. The transistors 81 to 84 are rendered conductive or non-conductive in accordance with the signals MGS0 and MGS1 from the CPU 1, and control the energization and energization direction to the magnetic head 10. Table 1 shows signals MGS0 and MGS1 and magnetic head 1
The relationship between 0 and the magnetic field generated is shown.

[Table 1] During magnetic writing, the signals MGS0 and MGS1 are alternately inverted to alternately switch the magnetic field generated by the magnetic head 10 between a positive magnetic field and a negative magnetic field, and data is written to the film at the timing.

The EEPROM 11 is a non-volatile memory and stores data such as control constants of the CPU 1. The data stored in the EEPROM 11 includes a threshold value for determining the output voltage of the perforation detection sensor. This threshold is used to detect the leading edge of the film during thrust. Note that E
Since the data in the EPROM 11 can be rewritten in the adjustment process after the camera is assembled, the same value may be written in all products with the design value fixed.
Adjustments may be made for each unit and different values may be written for each unit.

In this embodiment, the above-described tongueless film cartridge is used. As shown in FIG.
Two perforations are formed at the front end and the rear end of each shooting screen on one side of the film 21, and the positional relationship between the shooting screen and the perforations is the same for all shooting frames. An extra perforation 18 is formed on the leader side of the perforation 17 at the front end of the first shooting frame 16, and a notch 15 is formed in the leader portion of the film 21.
Is formed. These perforations are sensor T
5 and M6. Also, this film 2
1 is coated with a magnetic recording medium, and the magnetic head 10 can be used to magnetically record shooting information for each frame such as shooting date and time, screen size, and shooting conditions. Further, in this film cartridge, a data disk (not shown) on which information such as the total number of frames of the film 21 and ISO sensitivity is recorded, and a light lock (not shown) which is opened / closed as necessary to shield the exit of the film 21 Door (hereinafter,
LL door). Various information is recorded on the data disc with a black and white barcode,
When the data disk rotates as the film 21 is fed, the inversion interval time of the output signal of a sensor such as a photo reflector is read and information is reproduced. The stop position of the data disk is determined by the use state of the film 21, and is set to a stop position according to the use state such as unexposed, exposed, partially exposed, and developed. Therefore, the state of the film can be detected based on the output signal of the sensor when the film cartridge is loaded in the camera and the data disc is first rotated. Further, the stop position of the data disk can be visually recognized by a member that rotates integrally with the data disk and the spool, so that the state of the film can be known.

FIG. 10 shows the arrangement of the sensor T5, the sensor M6 and the magnetic head 10. The figure shows a state in which a frame on the film 21 is set to the photographing position, and the left side is the film winding direction. The film cartridge is on the right and the leader of the film 21 is on the left. Sensor T
5 is arranged on the cartridge side, and the sensor M6 is arranged on the winding spool side of the camera. Therefore, when the film 21 is wound up, the sensor T5 detects the same perforation before the sensor M6. The magnetic head 10 is arranged on the winding spool side of the camera. During the winding of one frame after exposure, the magnetic head 10 alternately generates a positive magnetic field and a negative magnetic field at a predetermined timing, and the captured data is magnetically recorded in the magnetic recording area 12 corresponding to the exposed captured screen.

In this embodiment, the left edge of the perforation 13 on the right side of the photographing screen is called the first edge,
The right edge is called the second edge. In addition, the left edge of the perforation 14 on the left side of the shooting screen of the next frame is set to the third edge.
The right edge is called the fourth edge. The position of the sensor T5 is set so that the magnetic head 10 is located at the left end (writing start position) of the magnetic writing area 12 when the second edge (right edge) of the perforation 13 on the right side of the photographing screen reaches the detection position of the sensor T5. Is decided. The position of the sensor M6 is determined so that the shooting screen of the next frame is set to the shooting position when the fourth edge (right edge) of the left perforation 14 of the next shooting screen reaches the detection position of the sensor M6. . Further, the distance between the sensor M6 and the sensor T5 is determined to be longer than the distance from the film front end to the notch 15.

Next, the operation of the embodiment will be described with reference to FIGS. When the power of the camera is turned on, the CPU 1 starts executing the main program shown in FIG. In step 201, the process waits until the cartridge is loaded. When the cartridge is loaded and the switch 3 detects that the cartridge lid is closed, the process proceeds to step 202.
In step 202, an opening / closing mechanism (not shown) is driven to open the LL door of the film cartridge. In the following step 203, the motor drive circuit 7 is controlled to rotate the motor 9 to rotate the data disk and read the data on the data disk. At this time, when the data disk is rotated in the forward direction, the film is sent out from the cartridge, so that the data disk is rotated in the reverse direction. The use state of the film is detected based on the read data, and if it is an unexposed film, the total number of frames of the film and the ISO speed are stored in the RAM of the CPU 1. Next, the routine proceeds to step 204, where the thrust processing routine shown in FIGS. 3 and 4 is executed. This thrust process will be described later. In the thrust process, the first frame of the film is fed to the shooting position and the thrust operation ends normally, or the thrust operation is stopped due to some abnormality (hereinafter referred to as thrust error) during thrust. There is. Step 2
At 05, it is determined whether or not a thrust error has occurred during thrust processing. If a thrust error has occurred, the routine proceeds to step 214, and if thrust has been completed normally, the routine proceeds to step 206.

If a thrust error occurs, the film is rewound in step 214. The film rewinding process will be described later. Then, in step 215, the data disk is stopped at the unexposed position. This film was confirmed to be an unexposed film in step 203, and because an error occurred during thrust, one frame will be taken out without being photographed, so a data disc can be loaded and used again. Set to the unexposed position. Then, the process proceeds to step 212, the LL door is closed and all the processes are completed. A detailed description of the method of stopping the data disk at the unexposed position is omitted, but the unexposed position of the data disk is detected by the signal from the sensor in the same manner as the data of the data disk is read in step 203. The motor 9 is detected and the motor 9 is stopped at a predetermined signal timing to set it to the unexposed position.

When the thrust is normally completed, the first frame is set to the photographing position and the photographing is possible. In step 206, it is judged by the switch 4 whether or not the shutter is released. When the shutter is released, the process proceeds to step 207 to execute a series of shooting operations. Although detailed description of the photographing operation is omitted, distance measurement and photometry are performed, and based on the results, the focus of the photographing lens is adjusted to expose the film. The strobe light may be emitted depending on the result of photometry. When the photographing operation is completed, the routine proceeds to step 208, where the winding processing routine shown in FIGS. 5 and 6 is executed to wind one frame of film, and during the winding, the magnetic writing processing routine shown in FIG. Is magnetically recorded on the film. The film winding process and the magnetic writing process will be described later. In the winding process, there are cases where the film is normally wound by one frame and the next frame is set at the shooting position, and there are cases where the film reaches the end of the film during winding and the winding is not completed. Step 209
It is determined whether or not the end of the film is detected during the winding process, and if the end is not detected, the process returns to step 206 and the above-described shooting operation is performed on the next frame.

On the other hand, if the end of the film is detected during the winding process, the process proceeds to step 210 and the rewinding process routine shown in FIG. 7 is executed. This rewinding process will be described later. When the film is rewound into the cartridge and the rewinding process is completed, the process proceeds to step 211, and since the film has been photographed, the data disk is set to the exposed position. As a result, even when the film cartridge is loaded into the camera again, it is detected from the stop position of the data disc that the film is an exposed film, and double exposure is prevented. To stop the data disk at the exposed position, a method similar to the method of stopping at the unexposed position is performed. After setting the data disk, the process proceeds to step 212, closes the LL door, and ends the process. Here, the photographer opens the cartridge lid and takes out the film. The opening of the cartridge lid is detected by the switch 3, and then the process returns to step 200 to wait for a new film cartridge to be loaded in the camera.

Next, the thrust process will be described with reference to FIGS. 3 and 4. In the thrust process, the LL door of the cartridge is opened, the cartridge spool is rotated in the forward direction, and the film is sent out from the cartridge. Then, the leader portion of the film is wound around the winding spool of the camera and is fed until the first frame reaches the photographing position. Therefore, the thrust process corresponds to the idling process which has been conventionally performed on the film which is widely used at present. Also,
In parallel with the thrust process, a threshold value for determining the output voltage based on the output voltages of the sensors T5 and M6 is set. The amount of reflection on the film surface may vary from film to film due to differences in the emulsion of the film, and the output voltages of the sensors 5 and 6 vary. Therefore, the amount of reflection on the rail surface and the amount of reflection on the film surface are detected, and the threshold value is determined based on both. Since the film must be fed to the detection position of the sensor in order to detect the amount of reflection on the film surface by the sensor, a temporary threshold value is set at the start of thrust. Then, thrust is started, the provisional threshold value is compared with the output voltage of the sensor, it is detected that the film has been fed to the detection position of the sensor, and the amount of reflection on the film surface is detected. Then, a threshold value is calculated based on the reflection amount on the film surface and the reflection amount on the rail surface, and is set as a formal threshold value instead of the temporary threshold value. In addition,
Although the motor 9 is energized during thrust,
Signals input from the sensors 5 and 6 are not inverted for a predetermined time or more (8 seconds in this embodiment), that is, the sensors 5 and 6 are not inverted.
If the perforation edge is not detected by 6, it is determined that the film is not fed, and a thrust error is generated.

FIG. 3 shows the processing from the thrust start to the setting of the threshold values of the sensors 5 and 6, and FIG. 4 shows the processing of feeding the first frame of the film to the photographing position subsequently. When the process is started in step 300, the motor 9
Is stopped and the film 21 is in the cartridge. In step 301, a temporary threshold value previously stored in the EEPROM 11 is set in order to determine the output voltage of the sensor M6. This threshold value is for detecting that the leading edge of the film 21 has reached the detection position of the sensor M6. This temporary threshold value may be stored in the EEPROM 11 as a fixed value (for example, data corresponding to 1/2 of the power supply voltage) in the manufacturing adjustment process of the camera, or may be adjusted for each camera. The adjusted value may be recorded by using. In the following step 302, the output voltages of the sensors T5 and M6 corresponding to the amount of reflection on the rail surface are read and stored in the RAM of the CPU 1. In step 303, the normal rotation of the motor 9 is started, and in step 304, the thrust error detection timer is set to 8 seconds and started. Then, the loop of steps 305 and 306 is repeated.

In step 305, when the thrust error detecting timer has timed out, it is judged as a thrust error and the routine proceeds to step 409. In step 306, the output voltage of the sensor M6 is input and compared with the temporary threshold value. When the output voltage is higher than the provisional threshold value, the sensor M6 receives the reflected light from the rail surface, that is, the sensor M6 faces the rail surface, and the leading edge of the film 21 is still at the detection position of the sensor M6. It is determined that the sheet has not been fed until, and the process returns to step 305. When the output voltage is lower than the provisional threshold value, the sensor M6 faces the film surface and the reflection plate on the rail surface is blocked by the film, that is, the leading end of the film reaches the detection position of the sensor M6. It is determined and the process proceeds to step 307. CPU1 is step 305
Since the processing speed of repeating the processing of step 306 and step 306 is sufficiently higher than the feeding speed of the film, it can be considered that the processing for detecting the leading edge of the film by the sensor M6 in step 306 is continuously performed, and the leading edge of the film is As soon as it reaches the detection position of the sensor M6, it can be detected.

When the tip of the film 21 is detected by the sensor M6 in step 306, the sensor T is detected in step 307.
Read the output voltage of 5. As shown in FIG. 10, since the sensor T5 is arranged upstream of the sensor M6 in the film winding direction, the fact that the film front end has reached the detection position of the sensor M6 means that the film front end has already detected the sensor T5. , And the sensor T5 faces the film surface. Therefore, the output voltage of the sensor T5 read in step 307 is a voltage corresponding to the amount of reflection on the film surface. In step 308, based on the output voltage of the sensor T5 corresponding to the reflection amount of the film surface read in step 307 and the output voltage of the sensor T5 corresponding to the reflection amount of the rail surface read in step 302, the sensor T5 is officially determined. A threshold value (hereinafter referred to as this threshold value). This threshold value may be set to a value between the voltage corresponding to the film surface reflection amount and the voltage corresponding to the rail surface reflection amount. Although various calculation methods are conceivable, two voltages are weighted with a coefficient to set an appropriate threshold value. The calculated threshold value is the RAM of CPU1
This threshold value is used until it is stored in the camera and a new film cartridge is loaded into the camera and thrust processing is performed. With the above, the process of setting the threshold value of the sensor T5 is completed. During this period, the feeding of the film 21 continues,
Considering the processing speed of the CPU 1, the threshold setting process can be sufficiently executed within a few mS, so that there is no risk of skipping the next perforation edge even if the film feeding is continued during that time. Further, since the threshold value of the sensor T5 is set after the thrust of the film is started, it is not necessary to set the temporary threshold value before the thrust is started.

When the setting of the main threshold value of the sensor T5 is completed, the routine proceeds to step 309, where the thrust error detecting timer is set to 8 seconds and restarted. And step 3
10. Go around the loop of step 311. Step 310
If the thrust error detection timer has timed out, it is determined that a thrust error has occurred, and step 40
Go to 9. In step 311, the output voltage of the sensor T5 is read and compared with the threshold value set in step 308.
If the input voltage is lower than the threshold value, it is determined that the perforation has not reached the detection position of the sensor T5 because the sensor T5 faces the film surface, and the step 31
Return to 0. If the output voltage is higher than the threshold value, the sensor T
Since 5 is opposed to the rail surface, it is determined that the first edge of the perforation at the rear end (the left edge of perforation 13 shown in FIG. 10) has reached the detection position of sensor T5. When the sensor T5 detects the first edge, the process proceeds to step 312.

In step 312, the output voltage of the sensor M6 corresponding to the amount of reflection on the film surface is read. Here, the first of the rear-end perforations is detected by the sensor T5.
The reason why the sensor M6 measures the amount of reflection on the film surface after detecting the edge (left edge) is as follows. As shown in FIG. 11, the leader portion of the film 21 has a notch 15. Since the sensor T5 and the sensor M6 trace the one-dot chain line of the film 21, the notch 15 passes through the detection positions of the sensor T5 and the sensor M6.
Therefore, if the output voltage of the sensor M6 is read immediately after the leading edge of the film is detected by the sensor M6 in step 306, the output voltage when the notch 15 is present at the detection position of the sensor M6 may be read. Since the output voltage at this time is not a voltage corresponding to the amount of reflection on the film surface, if the main threshold value of the sensor M6 is calculated based on this output voltage, the perforation edge detection accuracy of the sensor M6 is lowered. However, at the time when the sensor T5 detects the first edge (left edge) of the rear end perforation, the notch 15 has already passed the detection position of the sensor M6, and therefore corresponds exactly to the amount of reflection on the film surface. Can measure voltage.

In step 313, step 302
Based on the output voltage of the sensor M6 corresponding to the amount of reflection on the rail surface read in step S3 and the output voltage of the sensor M6 corresponding to the amount of reflection on the film surface read in step 312, a formal threshold value of the sensor M6 (hereinafter referred to as the book). (Called threshold). The threshold value of the sensor M6 is set in the same manner as the threshold value of the sensor T5. Above,
The process of setting the main threshold value of the sensor M6 is completed. Similar to the above-mentioned setting process of the threshold value of the sensor T5, the feeding of the film 21 is continued during this period, but the setting process of the threshold value is sufficiently executed within several ms considering the processing speed of the CPU 1. Therefore, there is no risk of skipping the next perforation edge even if the film is continuously fed during that time.

In step 400, the thrust error detecting timer is set to 8 seconds and restarted, and then step 40
It goes around the loop of 1 and 402. In step 401, when the thrust error detecting timer has timed out, it is judged as a thrust error and the routine proceeds to step 409. Step 40
In step 2, the output voltage of the sensor M6 is read and step 31
It is compared with the threshold value set in 3. If the output voltage is lower than the threshold value, the sensor M6 faces the film surface. On the other hand, if the output voltage is higher than the threshold value, the sensor M6 faces the rail surface through the perforation. In step 402, whether the determination result of the previous reading is the film surface or the rail surface is stored, and it is determined whether or not the determination result of this time is different from the determination result of the previous time. If it has not changed, it is determined that the edge is not detected, and the process returns to step 401. On the other hand, if it has changed, it is determined that an edge has been detected, and the process proceeds to step 403. In step 403, the number of edges is counted and it is determined whether the edge detected this time is the fourth edge.
If it is not the fourth edge, the process returns to step 400 and the above process is repeated.

When the sensor M6 detects the fourth edge, the motor 9 is stopped in step 404. Next, in step 405, the motor 9 is reversely rotated for a predetermined time (for example, about 5 mS) to apply the reverse energization brake, and in the following step 406, the motor 9 is short-circuited for a predetermined time (for example, about 80 mS) to apply the short brake. As a result, the film feeding is completely stopped, and the photographing screen of the first frame of the film 21 is set at the photographing position. In step 407, the total number of film frames is displayed on the film counter of the LCD 2. The total number of frames indicates the number of frames read from the data disk in step 203. Then, the process returns from step 408 to step 205. On the other hand, when the thrust error is detected, the thrust error detection flag is set in the RAM of the CPU 1 in step 409. This flag is an identification flag that indicates that a thrust error has been detected during thrust processing, and the determination in step 205 described above is performed based on this flag. When the flag is set in step 409, the processing from step 404 to step 407 is performed as in the case where the winding is normally completed, and the process returns from step 408 to step 205. When a thrust error occurs, "E" is displayed on the film counter of the LCD 2 in order to warn the occurrence of the thrust error at step 407. After the thrust is completed, step 3
08 and the main threshold value calculated in step 313 are EEPR
Store in OM11. As a result, this threshold value can be held until the next thrust is executed. Therefore, even if the battery may be removed after the film is loaded and the CPU 1 is reset, normal film feeding can be performed after the battery is re-loaded. In the above thrust processing, (1) setting of an appropriate threshold value that is not affected by variations in the amount of reflection of the film, (2) prevention of erroneous determination of the amount of reflection due to a notch near the tip of the film, (3) first frame Performed three functions of film feeding up to.

Next, the winding process will be described with reference to FIGS. The winding process is a process of feeding a film to set the next frame to the photographing position after the photographing of one frame is completed. Further, during the winding of one frame, the magnetic writing circuit 8 is driven at a predetermined timing, and the magnetic data is written on the film 21 by the magnetic head 10. The magnetic writing process will be described later. If the perforation edge cannot be detected by the sensors 5 and 6 for a predetermined time or longer (2 seconds in this embodiment) despite the fact that the motor 9 is energized during the winding of one frame, the film 21 is moving. It is determined that the film 21 has not reached the end of the film 21. In addition, after the winding of one frame is started, the first edge of the perforation at the rear end is located at the detection position of the sensor T5 (see FIG. 10).
It is assumed that the film feeding speed becomes sufficiently stable by the time the left edge of the perforation 13 shown in (1) reaches and then the feeding speed does not change.

When the exposure of the frame at the photographing position is completed, the winding process is started from step 500. Step 50
In 1, the data to be written on the film is processed into a magnetic data format and stored in a predetermined area of the RAM in the order of writing. The write data includes shooting date and time, selection information as to whether or not to print the shooting date and time, information whether or not the flash is used, brightness information, and print size designation. In addition, data that specifies the start and end of magnetic writing, data indicating the standard version of the film 21, checksum, and the like are written. These are converted into codes of "0" and "1" according to the standard so that they can be immediately output at the writing timing during feeding. The number of bits to write depends on the amount of data,
It is about 300 to 500 bits. Here, 376
It is assumed that bit (= 47 bytes) data is written. Since the write data is set at the timing of step 501, the shooting date and time data is set at step 50.
Even if it changes from 1 to before magnetic writing, the write data is left as it is. Also, the writing density of magnetic data is
The density is such that 25 bits are written during 1 mm feeding. The position (bit location) of data in one cycle is 33% when it is "0" and 67% when it is "1".

After the write data is stored in the RAM, the routine proceeds to step 502, where the motor 9 is started to rotate normally and the film 21 is fed in the winding direction. In the following step 503,
The end detection timer for detecting the end of the film 21 is set to 2 seconds and started. Further, in order to prepare for the magnetic writing process, MGS1 is set to H and the magnetic head 10 outputs a positive magnetic field. Then steps 504 and 505
Around the loop. In step 504, when the end detection timer expires, it is determined that the end of the film 21 has been reached, and the flow advances to step 518. Also, step 505
Then, the output voltage of the sensor T5 is read and compared with this threshold value. If the output voltage is lower than this threshold, the sensor T5
Is facing the film surface. On the other hand, if the output voltage is higher than the threshold value, the sensor T5 faces the rail surface through the perforation. In step 505, it is stored whether or not the previous determination result of the output voltage is the film surface or the rail surface, and it is determined whether or not the present determination result has changed from the previous determination result. If it has not changed, it is determined that the edge is not detected, and the step 5
Return to 04. If it has changed, it is determined that an edge has been detected, and the process proceeds to step 506.

In step 506, it is judged whether or not the detected edge is the first edge of the rear end perforation (the left edge of the perforation 13 shown in FIG. 10).
Since the edge detected by the sensor T5 immediately after the start of winding one frame is the first edge, the routine proceeds to step 507. In step 507, the feeding speed detecting timer is cleared and started, and then the process returns to step 503. When one frame is further wound up and the sensor T5 detects the next edge in step 505, the process proceeds to step 506. Since it is not the first edge this time, the process proceeds to step 508. In step 508, the feeding speed detecting timer is stopped. The feeding speed detection timer is started at the time when the first edge is detected,
Since the time is stopped when the edge is detected, the time counting time is the feeding time from the first edge to the second edge of the rear end perforation (from the left edge to the right edge of perforation 13 in FIG. 10).

In step 509, the output cycle of the magnetic writing signal is calculated based on the measured feeding time. Since the width of perforation is 2 mm and 25 bits of magnetic data are written in 1 mm, if the feeding time from the first edge to the second edge is Tp, the writing time Tw per bit is

## EQU1 ## Tw = Tp / (2 * 25) Here, T1 is obtained and stored in the RAM in order to facilitate the magnetic writing process.

## EQU2 ## T1 = Tw * 0.33 Next, in step 510, the output of the magnetic write signal is started. Although MGS0 = L and MGS1 = H are set at the start of winding, both of them are reversed at the same time. This becomes the clock of the first bit of data. Then step 51
At 1, the magnetic writing timer is started. The magnetic write timer is a timer for measuring the inversion timing of the magnetic write signals MGS0 and MGS1, and inverts MGS0 and MGS1 when this timer times out. In step 511, a value is set in the magnetic writing timer to specify the inversion timing of the first bit data.
When the 1st bit data is "0", T1 is set in the magnetic writing timer. When the 1st bit data is "1", {T1 × 2 + (correction)} is set in the magnetic writing timer. The setting value will be described later.

After setting the end detection timer to 2 seconds and restarting it in step 512, steps 513 to 515 are performed.
Around the loop. As is clear from FIG. 10, the sensor T
There is a distance of about half or more of the feeding distance of one frame from the time when 5 detects the second edge until the time when the sensor M6 detects the first edge. Therefore, under normal conditions, the magnetic writing in step 517 is repeated, and when the magnetic writing is almost completed, the inversion of the edge of the sensor M6 starts before and after that. Then, the magnetic writing process of the predetermined number of bits is completed before the sensor M6 detects the fourth edge, and when the sensor M6 detects the fourth edge in step 516, the process proceeds to step 600.

In step 513, when the end detection timer has timed out, it is determined that the end of the film 21 has been reached, and the flow advances to step 518. In step 514, when the magnetic writing timer times out, the process proceeds to step 517, and the magnetic writing process shown in FIG. 8 is executed. Although this magnetic writing process will be described later, MGS0 and MGS1 are reversed at the same time to reverse the magnetic field generated by the magnetic head 10 in step 515. Then, steps 513 to 515
Loop back. In step 515, the output voltage of the sensor M6 is read and compared with this threshold value. If the output voltage is lower than the threshold value, the sensor M6 faces the film surface. On the other hand, if the output voltage is higher than the threshold value, the sensor M6 faces the rail surface through the perforation. In step 515, it is stored whether the previous determination result of the output voltage is the film surface or the rail surface, and it is determined whether the current determination result has changed from the previous determination result. If it has not changed, it is determined that the edge is not detected, and the process returns to step 513. If it has changed, it is determined that an edge is detected and the process proceeds to step 516. In step 516, the number of edge inversions is counted, and if it is not the fourth edge, the process returns to step 512, the end detection timer is set to 2 seconds and restarted, and then step 5
Return to the loop from 13 to 515. If the fourth edge is detected by the sensor M6 in step 516, the film 21
The next frame has been fed to the shooting position, and the process proceeds to step 600 to perform a stop process.

In step 600, the motor 9 is stopped, and in the following step 601, the motor 9 is reversely rotated for a predetermined time (about 5 mS) to apply the reverse energization brake. Then step 60
At 2, the motor 9 is short-circuited for a predetermined time (about 80 mS) and the short brake is applied. As a result, the feeding of the film is completely stopped, and the photographing screen of the next frame is set at the photographing position. Next, at step 603, the magnetic writing timer is stopped. Normally, magnetic writing completes writing of a predetermined bit before the process proceeds to step 600, and step 8 described later is performed.
Although the magnetic writing timer is stopped at 12, the magnetic writing timer is also stopped here in case of a malfunction such as a change in the feeding speed. MGS in step 604
The magnetic writing is stopped by setting both 0 and MGS1 to L, and in the following step 605, the film counter of the LCD 2 is decremented by 1 and displayed. Then, the process returns from step 606 to step 209. Feeding is stopped by sensor M when winding one frame.
Since 6 is performed when an edge is detected, the fourth edge of the perforation at the front end of the next piece stops near the detection position of the sensor M6. At this time, the film 21 may return to the position where the signal of the sensor M6 is inverted due to the backlash of the feeding mechanism. However, in the present invention, since only the output voltage of the sensor T5 is read at the start of feeding, even if the signal returns to the position where the signal of the sensor M6 is reversed due to backlash, the edge is erroneously recognized when feeding to the next frame. There is nothing to do.

By the way, when the end of the film 21 is detected, the end detection flag is set to R of the CPU 1 in step 518.
Set to AM. This flag is an identification flag indicating that the end of the film has been detected during the one-frame winding process, and the determination in step 209 is made based on this flag.
Once the end detection flag is set, proceed to step 600,
Stop winding at steps 600 to 605 and step 6
The procedure returns from 06 to step 209. When the end of the film 21 is detected, the film counter of the LCD 2 is not decremented in step 605.

Next, the magnetic writing process will be described. FIG.
Shows the output signal waveform at the time of magnetic writing. The timing at which the magnetic field switches from positive magnetic to negative magnetic is called a clock, and the timing at which the negative magnetic field switches to positive magnetic is called data. The clock is always output at equal intervals. Based on this clock interval, when the write data is 0, the magnetic field is inverted (data is output) at a timing of 33% of the clock interval after the clock is output. When the write data is 1, the magnetic field is inverted (data is output) at the timing of 67% of the clock interval after clock output. This process will be described with reference to FIG. Step 80 when the previous MGS0 and MGS1 were reversed
When the magnetic writing timer started in step 8 (step 511 for the first time) expires, the magnetic writing process starts from step 800. First, in step 801, the write signals MGS0 and MGS1 are simultaneously inverted. Next, in step 802, it is determined whether or not the data bit output this time is the last bit. If it is the final bit, the process proceeds to step 812, the magnetic writing timer is stopped, and the magnetic writing process is ended. Since the magnetic writing timer is stopped, thereafter, the magnetic writing process is not performed again during the winding of one frame of this frame.

If it is not the final bit, step 803-
The processing of 807 is executed, and the count time until the next time up is set in the magnetic writing timer. The set time follows the table below.

[Table 2] T1 corresponds to 33% of the writing cycle. If the next output edge is a clock output and the data is 0, 33% of the time is set, so T1 is set as it is. When the next output edge is a clock output and the data is 1, 67% of the time is set in the timer. The time corresponding to 67% is set in the timer by obtaining the time of 66% from T1 × 2 and adding the correction for 1% to it. Even when the next output edge is data output, the magnetic writing timer time is similarly set according to Table 2. After that, the process proceeds to step 808.

In step 808, the magnetic writing timer is started. Next, in step 809, it is determined whether or not the next output edge is a clock output. If it is not a clock output, the process directly proceeds to step 811, and steps 513-
Return to the loop of 515. On the other hand, if the next output edge is a clock output, the process proceeds to step 810 and the output data is shifted by 1 bit. As a result, the output data for the next magnetic writing is set. Then, step 811
Then, the process returns to the loop of steps 513 to 515, and branches to step 800 each time the magnetic writing timer times out. This is the end of the description of the winding process and the magnetic writing process.

Next, the rewinding process will be described with reference to FIG.
The rewinding process is executed when a thrust error is detected during thrust and when the end is detected in the winding process. A sensor T5 is used to detect the film movement during the rewinding. Although the rewinding control can be performed by using the sensor M6, as is apparent from FIG. 10, the sensor T5 is closer to the cartridge than the sensor M6, and the signal is output after the film 21 is rewound into the cartridge more. Since it is eliminated, the rewinding process can be surely performed by using the sensor T5. In step 701, the film counter display on the LCD 2 is updated. In step 203, the number of frames displayed on the film counter at the start of rewinding is subtracted from the total number of frames read and stored from the data disc to obtain the number of frames that have been photographed, and this is displayed on the film counter. Next, in step 702, the edge number counter for counting the number of times of detection of the edge of the sensor T5 is set to 4. In step 703, the reverse rotation of the motor 9 is started, and then in step 7
At 04, the rewinding completion detection timer is set to a predetermined time (here, 8
Set to seconds) and start. This starts the rewinding of the film. Then steps 705 and 7
It goes around the loop of 06. In step 706, the output voltage of the sensor T5 is read. The method of reading the output voltage is the same as that in step 505 of the winding process. Step 70
When an edge is detected by the sensor T5 in step 6, step 70
The process proceeds to 7 and the edge number counter is decremented by 1. Next, at step 708, it is judged if the edge number counter is 0 or not. 0
If not, the process returns to step 704. On the other hand, when the edge number counter is 0, it is determined that the film 21 has been rewound by one frame, and the film counter display of the LCD 2 is decremented by 1 in step 709. Next, at step 710, the edge number counter is reset to 4. Then, the process returns to step 704 and the above process is repeated.

When the rewinding progresses and the film 21 is rewound to the leader portion, the edge is no longer detected by the sensor T5. If no edge is detected for 8 seconds, the rewinding completion detecting timer is timed up, and the process proceeds from step 705 to step 711 to end the rewinding process. After the rewinding is completed, the process returns to step 211 or step 215 while the motor 9 is still energized in the reverse direction. In step 211 or step 215, while detecting the position of the data disc by a sensor (not shown), the data disc is unexposed,
It stops at a position according to the state of the film 21, such as an exposed position. Therefore, the rewinding process is terminated while the motor 9 is energized in the reverse direction.

In this way, the following functions are achieved in the above embodiment. (1) A function for setting a threshold value for determining the output voltage level of the photo reflector for detecting the movement of the film, (2)
A function to prevent the cutout 15 at the leading end of the film from being mistaken for perforation, (3) A thrust function to feed the first frame of the film to the shooting position, (4) Wind up the next frame to the shooting position after exposure 1 Piece winding function,
(5) Function to write magnetic data on the film during the winding of one frame, (6) Function to rewind the film, (7) Function to display the number of remaining frames on the film counter. Since these functions operate independently, it is not necessary to mount them all in one camera. A feeding device that performs one or more of these functions can also be proposed as a modification of the above embodiment.

The method of determining the threshold value for determining the output voltage of the perforation detecting sensor is not limited to the above embodiment. Further, in the above-described embodiment, the example in which the reflection type photo reflector is used as the film feed amount detection sensor has been described, but a transmission type photo interrupter may be used. A roller or the like may be brought into direct contact with the film, and the film feeding speed may be detected by the rotation speed of the roller in the winding process. Further, in the above embodiment, the timer setting time and the magnetic writing characteristic are described using specific numerical values, but the numerical values are not limited to these numerical values.

In the above embodiment, the sensor M6 and the sensor T
Although the example in which the determination of the output voltage of 5 is performed only once is shown, a process of reading the same output voltage twice or more and reconfirming by using the conventional signal noise removal method is added.
It is also possible to prevent erroneous determination due to noise. FIG.
3 shows the double reading process. Edge detection is performed by the sensor T5 in step 505 of FIG.
By replacing 5 with the flowchart of FIG. 13, the double reading process for Chatterkiller can be realized. That is, FIG.
From step 504 to step 1300 in FIG. 13, it is determined whether or not an edge is detected by the sensor T5. When an edge is detected, the process proceeds to step 1301
If not detected, the process returns to step 504 in FIG. When an edge is detected by the sensor T5, step 1301
After waiting for 1 mS, the process proceeds to step 1302 after 1 mS, and the edge detection by the sensor T5 is discriminated again. If the sensor T5 detects an edge again, the process proceeds to step 506 in FIG. 5, and if not detected, step 504 in FIG.
Return to. Note that the sensor T5 other than step 505 in FIG.
The same applies to the edge detection by the sensor M6.
The same applies to reading switches other than the sensors 5 and 6. Further, the photoreflectors of the sensors T5 and M6 may be powered on only during film feeding. In the present embodiment, the power-on and power-off timings are not specified, but this does not limit the present invention. Furthermore, in the above-described embodiment, a reflection plate is attached to the rail surface, and an example in which the reflection amount on the rail surface is higher than the reflection amount on the film surface is shown. However, the rail surface is a non-reflection surface, and the reflection amount on the film surface is The present invention can be applied to the case where the reflection amount is higher than that of the rail surface.

In the configuration of the above embodiment, the sensors T5 and M6 are photosensors, the sensor T5 is the first photosensor, the sensor M6 is the second photosensor, and the CP is the CP.
U1 constitutes a perforation detecting means and a feeding abnormality determining means, the CPU 1, the motor drive circuit 7 and the motor 9 constitute a film feeding means, the EEPROM 11 constitutes a non-volatile storage means, and the LCD 2 constitutes a photographed number display means.

[0048]

【The invention's effect】

(1) As described above, according to the invention of claim 1,
A threshold value is set based on the output signal level of the photo sensor when the film is present at the detection position of the photo sensor and when the film is not present, and the perforation of the film is detected by comparing the output signal of the photo sensor with the threshold value. Then, since the film is fed based on the perforation detection result, even if there is a difference in the reflection amount depending on the film, the optimum threshold value can be set for the loaded film, and the perforation can be accurately measured. It is possible to improve the film feeding accuracy by detecting. (2) According to the invention of claim 2, when the film is fed out from the cartridge, the output signal of the second photo sensor arranged on the winding spool side of the camera in the film feeding direction is set in advance. Since the leading edge of the film is detected by comparing it with the threshold value, the leading edge of the film can be reliably detected and the presence or absence of the film at the detection position of the photo sensor can be accurately determined. The value can be set correctly. (3) According to the invention of claim 3, the output signal level of the first photosensor before the film is sent out from the cartridge and the output signal level at the time when the leading edge of the film is detected at the detection position of the second photosensor. The threshold value of the first photosensor is set based on the output signal level of the first photosensor. Before the film is sent out from the cartridge, there is no film at the detection position of the first photo sensor, while the second photo sensor is arranged closer to the winding spool of the camera than the first photo sensor. When the leading edge of the film is detected at the detection position of the photo sensor, the film exists at the detection position of the first photo sensor. Therefore, it is possible to correctly detect the output signal of the first photo sensor when the film is present at the detection position of the first photo sensor and when the film is not present, and it is possible to accurately set the threshold value of the first photo sensor. Further, as a result, the film feeding accuracy can be improved. (4) According to the invention of claim 4, the output signal level of the second photo sensor before the film is sent out from the cartridge and the first signal at the time when the perforation of the film is detected at the detection position of the first photo sensor. The threshold value of the second photo sensor is set based on the output signal level of the second photo sensor. Before the film is sent out from the cartridge, there is no film at the detection position of the second photo sensor, while at the time when the perforation of the film is detected at the detection position of the first photo sensor, the detection position of the second photo sensor is detected. There is a film in. Therefore, it is possible to correctly detect the output signal of the second photo sensor when the film is present at the detection position of the second photo sensor and when the film is not present, and it is possible to accurately set the threshold value of the second photo sensor. Further, as a result, the film feeding accuracy can be improved. (5) According to the invention of claim 5, the first photosensor and the second photosensor are provided for the film having a notch at the passage position of the first and second photosensors at a predetermined distance from the tip. Since the distance between the two is longer than the predetermined distance, the notch of the film has already passed the detection position of the first photosensor when the leading edge of the film is detected at the detection position of the second photosensor. And first
When there is a notch at the detection position of the photo sensor, the output signal of the first photo sensor is not detected to set the threshold value. (6) According to the invention of claim 6, since the threshold value of the photo sensor is stored in the non-volatile storage means, even when the battery is replaced with the film still loaded, the film is replaced next time. The threshold is held until. (7) According to the invention of claim 7, when the photographing frame is fed to a predetermined photographing position, the feeding of the film is stopped when the perforation edge is detected a predetermined number of times at the detection position of the second photo sensor. Since it is set, the film can be reliably set to the shooting position. (8) According to the invention of claim 8, when the perforation is not detected for a predetermined time or more at the time of winding the film, it is determined that the feeding is abnormal. Therefore, the feeding abnormality at the time of winding can be easily detected. it can. (9) According to the invention of claim 9, when it is determined that the feeding is abnormal at the time of winding the film, the film is rewound into the cartridge and the data disk provided in the cartridge is set to the unexposed position or the exposed position. As a result, the unexposed film can be loaded again for shooting, and even if one or more frames of film have been reloaded, it is possible to prevent double exposure of frames that have already been filmed. To be done. (10) According to the tenth aspect of the present invention, when one frame is wound after exposure, the film feeding speed is calculated based on the time taken for the perforation to pass through the detection position of the first photosensor. It is possible to accurately detect the feeding speed for each frame winding. (11) According to the eleventh aspect of the invention, the magnetic data is recorded on the film at the time of winding one frame after exposure, based on the feeding time of the film calculated at the time of winding one frame after exposure. Magnetic recording can always be performed at a constant recording density even if the feeding speed changes for each frame winding. (12) According to the invention of claim 12, the film is rewound into the cartridge while detecting the perforation by the first photosensor arranged on the cartridge side in the film feeding direction. The rewinding process can be performed more reliably than using the second photo sensor on the winding spool side of the camera. (13) According to the invention of claim 13, the rewinding of the film is stopped when a predetermined time has elapsed after the perforation was not detected by the first photosensor arranged on the cartridge side in the film feeding direction. Therefore, the rewinding process can be completed without fail. (14) According to the fourteenth aspect of the invention, the number of shots is reduced by one each time the film is rewound into the one-frame cartridge, so that the number of remaining frames at the time of rewinding can be displayed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment.

FIG. 2 is a main flowchart of one embodiment.

FIG. 3 is a flowchart showing a thrust process of one embodiment.

FIG. 4 is a flowchart showing thrust processing of one embodiment following FIG.

FIG. 5 is a flowchart showing a winding process according to an embodiment.

FIG. 6 is a flowchart showing a winding process according to the embodiment, following FIG. 5;

FIG. 7 is a flowchart showing a rewinding process according to an embodiment.

FIG. 8 is a flowchart showing a magnetic writing process according to an embodiment.

FIG. 9 is a diagram showing a magnetic writing circuit according to an embodiment.

FIG. 10 is a diagram showing an arrangement of a sensor and a magnetic head according to an embodiment.

FIG. 11 is a view showing the leading end of the film according to the embodiment.

FIG. 12 is a time chart showing a magnetic write signal according to an embodiment.

FIG. 13 is a flowchart showing a double reading process of the sensor according to the embodiment.

[Explanation of symbols]

 1 CPU 2 LCD 3 Cartridge Lid Switch 4 Release Switch 5 Sensor T 6 Sensor M 7 Motor Drive Circuit 8 Magnetic Writing Circuit 9 Motor 10 Magnetic Head 11 EEPROM 12 Magnetic Data Writing Area 13 Perforation 14 Perforation 15 Film Cutout 16 First Frame 21 film

Claims (14)

[Claims] 1. A photosensor installed at a perforation passage position of a film, which outputs a signal of a level according to the amount of received light, and compares the output signal of the photosensor with a threshold value to detect the perforation of the film. A film feeding device for a camera, comprising: a perforation detecting means for controlling the perforation detecting means; and a film feeding means for feeding the film based on a perforation detection result by the perforation detecting means, wherein the perforation detecting means is the photosensor. The film feeding device for a camera, wherein the threshold value is set based on an output signal level of the photo sensor when the film is present and when the film is not present at the detection position. 2. The film feeding device for a camera according to claim 1, wherein the photo sensor is a first photo sensor arranged on the cartridge side in the film feeding direction, and the camera is wound in the film feeding direction. A second photo sensor disposed on the spool side, and the perforation detection unit presets an output signal of the second photo sensor when the film is fed from the cartridge by the film feeding unit. A film feeding device for a camera, wherein the leading edge of the film is detected by comparing with a provisional threshold value. 3. The film feeding device for a camera according to claim 2, wherein the perforation detecting means outputs the output signal of the first photosensor before the film is fed out from the cartridge by the film feeding means. The threshold value of the first photosensor is set based on the level and the output signal level of the first photosensor at the time when the leading edge of the film is detected at the detection position of the second photosensor. A film feeding device for a camera, characterized in that 4. The film feeding device for a camera according to claim 2, wherein the perforation detection means outputs the output signal of the second photo sensor before the film is fed from the cartridge by the film feeding means. The threshold value of the second photosensor is set based on the level and the output signal level of the second photosensor at the time when the perforation of the film is detected at the detection position of the first photosensor. A film feeding device for a camera, characterized in that 5. The film feeding device for a camera according to claim 2, wherein the film is the first and second films at a predetermined distance from a leading edge.
The photo film feeding device for a camera, wherein the photo sensor has a cutout at a passing position, and a distance between the first photo sensor and the second photo sensor is longer than the predetermined distance. 6. The film feeding device for a camera according to claim 1, wherein the threshold value is stored in a non-volatile storage means. 7. The film feeding device for a camera according to claim 2, wherein the film feeding means feeds the photographing frame to a predetermined photographing position. A film feeding device for a camera, wherein the film feeding is stopped when a perforation edge is detected a predetermined number of times at a detection position of a sensor. 8. The film feeding device for a camera according to claim 1, wherein the perforation detection means does not detect perforation for a predetermined time or more when the film is wound by the film feeding means. In this case, the film feeding device for a camera is provided with a feeding abnormality judging means for judging a feeding abnormality. 9. The film feeding device for a camera according to claim 8, wherein the film feeding means winds the film around the cartridge when the feeding abnormality determination means determines that the feeding is abnormal. A film feeding device for a camera, wherein the film is returned and the data disk provided in the cartridge is set to an unexposed position or an exposed position. 10. The film feeding device for a camera according to claim 2, wherein the perforation detection means detects a detection position of the first photosensor when winding one frame after exposure. A film feeding device for a camera, wherein a film feeding speed is calculated on the basis of a time when a perforation passes. 11. The film feeding device for a camera according to claim 10, wherein magnetic data is recorded on the film at the time of winding one frame after exposure based on the feeding time of the film calculated by the perforation detection means. A film feeding device for a camera, comprising: 12. The film feeding device for a camera according to claim 2, wherein the film feeding means detects perforations by the first photosensor and the perforation detection means. A film feeding device for a camera, wherein the film is rewound into the cartridge. 13. The film feeding device for a camera according to claim 12, wherein the film feeding means has passed a predetermined time after no perforation is detected by the first photosensor and the perforation detecting means. A film feeding device for a camera, characterized in that the rewinding of the film is stopped. 14. The film feeding device for a camera according to claim 12, wherein the number of shots is reduced by one each time the film is rewound by one frame by the film feeding means. A film feeding apparatus for a camera, characterized by comprising: