JPH08122877A - Film feeding device for camera - Google Patents

Abstract

PURPOSE: To improve the reliability to a film feed by changing the feeding state, at the frame feed, when the feed of a prescribed quantity is not detected by a detecting means after the lapse of a prescribed time from a prescribed point of time. CONSTITUTION: The one-frame winding of a film is started, and the feeding time until the front end of the perforation of a photographing frame passes the detecting position of a sensor PS2 after it passes the detecting position of a sensor PS1 is counted. The feeding speed is calculated from the feeding time and the feeding distance, and the duty of a motor at deceleration is set according to the feeding speed. In this case, when the feed of a prescribed quantity is not detected by a detecting means even after the lapse of a prescribed time from a prescribed point of time at a frame feeding for setting a photographing frame to a prescribed position, or the pass of a prescribed perforation is not detected by a perforation detecting means even after the lapse of a prescribed time from the start of the film feed, the feeding state of the film is changed.

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.

[0002]

2. Description of the Related Art There is known a camera for detecting film perforation to control film feeding and magnetic recording on the film (for example, Japanese Patent Laid-Open No. 4-328).
536). In this type of camera, for example, a film as shown in FIG. 2 is used. Two perforations P for each frame on one side of this film
X and PY are provided at unequal intervals.

For a film in which the perforations are installed at unequal intervals, a sprocket that meshes with the perforations and rotates in conjunction with the movement of the film is used. Then, when the sprockets rotate by one frame at the time of feeding the film frame, the sprockets are mechanically locked to accurately stop the photographing frame on the film at a predetermined position. However, in the above-mentioned film, since the perforations are installed at unequal intervals, the sprocket and the locking mechanism cannot be used to feed the film, and the film feed amount is electrically detected to detect the film feed. You have to send it.

Therefore, when the unexposed frame approaches the predetermined photographing position during frame feeding, the film feeding motor is intermittently braked to reduce the winding speed to stop the unexposed frame at the predetermined photographing position. I have to. At this time, the time from the activation of the film feeding motor to the feeding of a predetermined amount of film is measured, and the intermittent braking strength during deceleration is changed according to the feeding time.

[0005]

By the way, the film feeding device of a camera is normally supplied with power from a battery mounted in the camera. The terminal voltage of this battery depends on the operating environment such as temperature and the amount of supplied power. It changes according to usage. The terminal voltage of the battery has a great influence on the film feeding speed, and when the terminal voltage decreases, the feeding speed also decreases. Further, the load of the feeding device may change due to the deformation of the film itself or some mechanical cause of the feeding mechanism, which may change the film feeding speed.

However, in the above-described conventional film feeding device for a camera, even if the feeding speed is suddenly decreased at the time of deceleration due to the above-mentioned cause, the brake decided before the deceleration is applied, so that the film feeding is stopped. There is a problem that the photographing frame stops before the predetermined photographing position because the feeding speed at the time of deceleration becomes low.

It is an object of the present invention to monitor the feeding status of a film by a simple method and perform an appropriate processing according to the result.

[0008]

In order to achieve the above object, the invention of claim 1 provides a feeding means for feeding a film, a detecting means for detecting a predetermined position on the film, and a predetermined photographing frame. At the time of frame feeding for setting to the photographing position, if the detecting means does not detect the feeding of a predetermined amount even after a lapse of a predetermined time, the feeding state of the film by the feeding means is changed. And a control means for According to a second aspect of the present invention, a feeding unit for feeding the film, a perforation detecting unit for detecting the perforation of the film, and a frame feeding for setting the photographing frame at a predetermined photographing position, a predetermined time elapses. Also, there is provided control means for changing the feeding state of the film by the feeding means when the perforation detection means does not detect the passage of the film in a predetermined section. According to a third aspect of the present invention, the feeding means for feeding the film, the perforation detecting means for detecting the perforation of the film, and the perforation detecting means for setting the photographing frame at a predetermined photographing position are set by the perforation detecting means. When the perforation is detected, the film feeding speed of the feeding means is reduced, and when the photographing frame reaches a predetermined photographing position, the film feeding of the camera is provided with a control means for stopping the film feeding by the feeding means. It is applied to a feeding device and changes the feeding state of the film by the feeding means when the perforation detection means does not detect passage of the film being decelerated in a predetermined section by the control means even after a predetermined time elapses. To do. According to a fourth aspect of the present invention, a motor for feeding a film, in which a plurality of perforations are provided at the same position of each photographing frame, a driving means for driving the motor, a perforation detecting means for detecting the perforation, and a photographing frame are provided. At the time of frame feeding for setting to a predetermined shooting position, at the time of detection of a predetermined perforation by the perforation detecting means, the driving means brakes the motor to reduce the film feeding speed, and the shooting frame makes a predetermined shooting. The present invention is applied to a film feeding device of a camera having a control means for stopping the film feeding by the driving means when the position is reached, and the control means allows the perforation detection means to decelerate even after a predetermined time has elapsed. When the passage of the film in the predetermined section is not detected, the driving means is used. With releasing the brake by, changing the driving state of the motor. The film feeding device for a camera according to claim 5, wherein when the control means does not detect passage of the decelerating film in a predetermined section by the control means even after a predetermined time has elapsed, the drive means causes Motor 100
It is designed to be driven at a duty of%. According to a sixth aspect of the present invention, there is provided a film feeding device for a camera, wherein a predetermined section of the film is a perforation section. According to a seventh aspect of the present invention, there is provided a film feeding device for a camera, wherein the predetermined section of the film is a section between perforations. The film of the film feeding device for a camera according to claim 8 is a film in which perforations are provided at unequal intervals. Claim 9
The film of the film feeding device of the camera is a film in which perforations are provided at unequal intervals, and the detection means detects the perforation of the film.

[0009]

In the frame feeding for setting the photographing frame to the predetermined photographing position, if the detecting means does not detect the feeding of the predetermined amount even if the predetermined time has passed from the predetermined time point, or the predetermined time has passed. Even when the perforation detection means does not detect the passage of the film in the predetermined section, or when the perforation detection means does not detect the passage of the decelerating film in the predetermined section even after the elapse of a predetermined time, Change the feeding status. Further, at the time of detection of a predetermined perforation, the motor is braked to reduce the film feeding speed, and even after a predetermined time elapses, the perforation detection means decelerates a predetermined section of the film, for example, the perforation section or the perforation and the perforation. When the passage of the section between and is not detected, the brake is released and the driving state of the motor is changed to, for example, 100% duty.

[0010]

[First Embodiment] FIG. 1 is a functional block diagram showing a configuration of a camera including a film feeding apparatus according to the first embodiment. SW1 is a power switch of the camera, SW2 is a switch that is turned on when a release button (not shown) is half-pressed, and SW3 is a switch that is turned on when the release button is fully pressed. Also,
SMg is a magnet for opening and closing the shutter. CON is a control circuit for the camera, which performs photometry, distance measurement, mirror control, aperture control, shutter opening / closing magnet control, etc. in response to a command from an arithmetic and control unit CPU described later. The photometric information and the distance measuring information are sent to the arithmetic and control unit CPU. The EEPROM is an electrically erasable non-volatile memory in which various data such as a threshold voltage for a comparator and an adjustment value of the camera are recorded via an IN terminal when the camera is manufactured. MD is a drive circuit for the film feeding motor M, which drives the motor M to wind and rewind the film.

PS1 and PS2 are optical sensors for detecting the perforation of the film,
A current is output according to a change in the amount of incident light caused by a difference in light transmittance or light reflectance between the perforation and the film. In this embodiment, an example using a light transmission type sensor will be described. This output current is converted into a voltage by the load resistor R and sent to the comparator CP1. Hereinafter, the voltage across the load resistor R will be referred to as a perforation detection voltage. The load resistor R is the sensor PS1 and P.
Commonly provided for S2. The D / A converter converts the digital value of the threshold voltage sent from the arithmetic and control unit CPU into an analog value and sends it to the comparator CP1. The comparator CP1 compares the perforation detection voltage with the threshold voltage, and when the detection voltage exceeds the threshold voltage, the arithmetic control unit CP1.
A perforation detection signal is output to U, and a film detection signal is output when the detection voltage becomes lower than the threshold voltage.

The arithmetic and control unit CPU is composed of a microcomputer and peripheral parts such as a ROM, a RAM and a timer, and performs various sequence control of the camera and various arithmetic operations. The arithmetic and control unit CPU receives the first threshold voltage for the sensor PS1 and the sensor P from the EEPROM.
The second threshold voltage for S2 is input, and one of the threshold voltages is output to the D / A converter as needed. The arithmetic and control unit CPU also supplies power to the sensor PS1 via the line L7 and power to the sensor PS2 via the line L8. Power is not supplied to the sensors PS1 and PS2 at the same time, but power is supplied separately for each period during which each sensor needs to be operated. The arithmetic and control unit CPU further controls the drive circuit MD to control the film feeding.

FIG. 2 is a diagram showing the positional relationship between the film used in the first embodiment and the sensors PS1 and PS2, in which an arbitrary photographing frame Fn (n = 1, 2, ...) Is predetermined. The state is shown in which the photographing position, that is, the position facing the aperture is set. This camera is a so-called normal wind type camera that shoots while film is being wound frame by frame. There is a take-up spool of a camera (not shown) on the right side of the figure, and a film cartridge (not shown) on the left side of the figure. There is. Therefore, the right direction in the figure is the winding direction, and the left direction is the rewinding direction. The leader of the film is on the right side of the figure. Two perforations are provided at the same location on each film frame on one side of the film. In the following, the perforation on the cartridge side (left side in the figure) of an arbitrary frame Fn is called PX and the leader side ( The perforation (on the right side of the figure) is called PY. Also, perforation P
The front end of X in the film winding direction is XF, the rear end is XR, the front end of the perforation PY in the film winding direction is YF, and the rear end is YR. Further, the black circles in the figure indicate the installation positions of the sensors PS1 and PS2, that is, the detection positions.

3 to 8 are flow charts showing a control program of the arithmetic and control unit CPU, and FIG. 9 is a view for explaining the film feeding operation of the first embodiment. The operation of the first embodiment will be described with reference to these figures. Switch S
When W1 is turned on and the camera is turned on, the arithmetic and control unit CPU starts executing this control program.
In step S1, system initialization such as memory reset is performed by system reset. In the following step S2, various adjustment data of the camera including the first threshold voltage for PS1 and the second threshold voltage for PS2 are read from the EEPROM and set. In step S3, it is determined whether or not the release button is half-pushed by the switch SW2. When the release button is half-pushed, the process proceeds to step S4, and the control circuit CON is instructed to perform photometry and distance measurement via the line L3. Step S
In step 5, it is determined whether or not the release button has been fully pressed by the switch SW3. If the release button is not fully pressed, the process proceeds to step S5A, and it is determined whether or not the release button is still half pressed by the switch SW2. If the release button is still half-pressed, the process returns to step S5 to wait for shutter release, and if the half-press of the release button is released, the process returns to step S3. On the other hand, when the release button is fully pressed and the shutter is released, the process proceeds to step S6, and the control circuit CON is instructed to perform exposure.

In step S7, the first threshold voltage for PS1 is output to the D / A converter via the line L5, and the first threshold voltage is set in the comparator CP1. Next, in step S8, the line L6
A drive circuit MD is instructed to drive the motor M to start film winding. FIG. 9A shows a state where the photographing frame Fn is set to a predetermined photographing position and the exposure is completed. From this state, one frame feed for setting the next unexposed frame Fn + 1 to the predetermined photographing position, that is, The normal wind type camera starts winding one frame. In step S9 after starting film winding, power is supplied to the sensor PS1 to start the perforation detection operation, and in step S10, the sensor PS1 is detected.
It is determined whether or not the perforation detection voltage by exceeds the first threshold voltage and the perforation detection signal is output from the comparator CP1.

As shown in FIG. 9B, when the front end XF of the perforation PX of the photographing frame Fn reaches the detection position of the sensor PS1, the amount of light incident on the sensor PS1 sharply increases and the output current increases. The perforation detection voltage rises. Then, when the perforation detection voltage exceeds the first threshold voltage, the perforation detection signal is output from the comparator CP1. That is, when the front end XF of the perforation PX of the photographing frame Fn passes the detection position of the sensor PS1, the perforation detection signal is output.

When the sensor PS1 detects the front end XF of the perforation PX of the photographing frame Fn, step S1
Proceed to 1 to start timekeeping with the built-in timer. Supply of power to the sensor PS1 is stopped in step S12, and power is supplied to the sensor PS2 in subsequent step S13 to start the perforation detection operation. Further, in step S14, the second threshold voltage for PS2 is output to the D / A converter, and the second threshold voltage is output to the comparator CP1.
Set the threshold voltage. In step S15, the perforation detection voltage detected by the sensor PS2 exceeds the second threshold voltage, and the comparator C
It is determined whether or not the perforation detection signal is output from P1.

As shown in FIG. 9 (c), when the front end XF of the perforation PX of the photographing frame Fn reaches the detection position of the sensor PS2, the amount of light incident on the sensor PS2 rapidly increases and the output current increases. The perforation detection voltage rises. When the perforation detection voltage exceeds the second threshold voltage, the perforation detection signal is output from the comparator CP1. That is, when the front end XF of the perforation PX of the photographing frame Fn passes the detection position of the sensor PS2, the perforation detection signal is output.

When the front end XF of the perforation PX of the photographing frame Fn is detected by the sensor PS2, step S
16, the time from when the front end XF of the perforation PX of the shooting frame Fn passes the detection position of the sensor PS1 to when it passes the detection position of the sensor PS2 is read from the timer, and the feeding distance and feeding time in that period are read. The film winding speed Vo1 is calculated based on The feeding distance in the above period is the distance that the film moves from the state shown in FIG. 9 (b) to the state shown in FIG. 9 (c).
It is equal to the distance between the sensors PS1 and PS2.

At step S17, the calculated winding speed V
It is determined whether or not o1 is equal to or higher than a predetermined speed V1, and Vo1 is V
If it is 1 or more, it is determined that the winding is performed at high speed, and the process proceeds to step S19 to control the drive circuit MD to control the motor M.
Is driven at a duty of 50%. On the other hand, Vo1 is V1
If it is smaller than the above, the process proceeds to step S18, and the winding speed V
It is determined whether o1 is equal to or higher than the predetermined speed V2. here,
V2 <V1. If Vo1 is equal to or higher than V2, it is determined that the medium is wound at a medium speed, and the process proceeds to step S20 to control the drive circuit MD to drive the motor M with a duty of 75%. When the winding speed Vo1 is lower than the predetermined speed V2, it is determined that the winding speed is low, and the step S2 is performed.
In step 1, the drive circuit MD is controlled to drive the motor M without duty, that is, with 100% duty.

Thus, in the state shown in FIG. 9 (a), one frame of film is started to be wound, and the front end XF of the perforation PX of the photographing frame Fn is detected by the sensor PS1 as shown in FIG. 9 (b). After passing through
As shown in (c), the feeding time until passing the detection position of the sensor PS2 is measured. Then, the feeding speed is calculated from the feeding time and feeding distance, and the duty of the motor during deceleration is set according to the feeding speed. Figure 9
At the time when the front end XF of the perforation PX of the photographing frame Fn reaches the detection position of the sensor PS1 after starting to wind one frame of the film in the state shown in (a), as shown in FIG. It is considered that the feeding speed is constant and sufficiently stable, and the influence of mechanical rattling at the start of winding described above is eliminated, so that an accurate film feeding speed can be measured. Since the drive duty of the motor M is determined according to the accurately measured feeding speed, the film can be accurately decelerated toward the target stop position regardless of the speed at which the film is wound. . The feeding time from when the front end of the perforation PX of the photographing frame Fn passes the detection position of the sensor PS1 to when it passes the detection position of the sensor PS2 is measured, and the duty of the motor during deceleration according to the measured time is measured. May be set.

In step S22, the sensor PS2
The maximum time for which the perforation PX of the photographing frame Fn passes the detection position of is set as the escape time in the timer, and it is started. If the perforation PX does not pass the detection position of the sensor PS2 even after the elapse of this escape time, it is determined that the film has stopped halfway or the film feeding speed has drastically decreased, which will be described later. Perform backup processing. In step S23, it is determined whether or not the perforation detection voltage by the sensor PS2 is lower than the second threshold voltage and the film detection signal is output from the comparator CP1.

When the rear end XR of the perforation PX of the photographing frame Fn passes the detection position of the sensor PS2, the amount of light incident on the sensor PS2 sharply decreases, the output current decreases, and the perforation detection voltage decreases. Then, when the perforation detection voltage becomes lower than the second threshold voltage, the film detection signal is output from the comparator CP1. That is, the sensor P
The detection position of S2 is set to the perforation PX of the shooting frame Fn.
When the trailing edge XR passes, a film detection signal is output. When the film detection signal is output, the process proceeds to step S25, where the time from the front end XF of the perforation PX of the photographing frame Fn passing to the rear end XR of the perforation PX and the distance of the perforation PX are detected. The hoisting speed Vo2 is obtained based on this.

In step S26, the perforation P
It is determined whether or not the passing speed Vo2 of X is equal to or higher than a predetermined speed V3, and if Vo2 is V3 or higher, it is determined that the perforation passing speed is high, and the process proceeds to step S28. Drive in%. On the other hand, if the perforation passage speed Vo2 is smaller than the predetermined speed V3, the process proceeds to step S27, and it is determined whether the passage speed Vo2 is equal to or higher than the predetermined speed V4. Here, V4 <V3. The passing speed Vo2 is the predetermined speed V
If it is 4 or more, it is determined that the perforation passage speed is medium speed, and the process proceeds to step S29, and the drive circuit MD drives the motor M with a duty of 75%. In addition,
When the passing speed Vo2 is smaller than the predetermined speed V4, it is determined that the perforation passing speed is low and the step S30 is performed.
Then, the drive circuit MD is controlled to drive the motor M with no duty, that is, with a duty of 100%.

On the other hand, in step S23, the comparator C
When the film detection signal is not output from P1, the process proceeds to step S24, and it is determined whether or not the timer having set the escape time has timed out and the escape time has ended. If the escape time has not ended, step S
Return to 23, and even if the escape time has passed, the sensor PS
When the perforation PX of the photographing frame Fn does not pass the detection position of 2, whether the film has stopped midway,
Alternatively, it is determined that the film feeding speed is drastically reduced, and the process proceeds to step S30 to control the drive circuit MD so that the motor M has no duty, that is, the duty 100.
Drive in%.

As described above, after the deceleration of the film is started, the perforation passage time is measured to calculate the perforation passage speed, and the duty of the decelerating motor is reset according to the passage speed. It is possible to correct the deceleration accurately with respect to the target stop position, no matter what speed the film is decelerated. Also, the maximum time for the perforation to pass is set as the escape time, and if the perforation does not pass even after the escape time has elapsed, the brake is released and the motor is driven at 100% duty, so the film is It has stopped,
The film feeding speed does not suddenly decrease, and the reliability of the film feeding can be improved.

In step S31, the sensor PS2
The maximum time from the passage of the rear end XR of the perforation PX of the photographing frame Fn to the passage of the front end YF of the perforation PY of the next photographing frame Fn + 1 is set as the escape time in the timer and the start is started. If the next perforation cannot be detected even after the elapse of this escape time, it is judged that the film has stopped halfway or the film feeding speed has drastically decreased, and a backup process described later is performed.

In step S32, it is determined whether the perforation detection voltage of the sensor PS2 exceeds the second threshold voltage and the perforation detection signal is output from the comparator CP1. The detection position of the sensor PS2 is set to the perforation P of the next shooting frame Fn + 1.
When the front end YF of Y passes and the perforation detection signal is output from the comparator CP1, step S3
Go to 4. Then, in step S34, the time from the rear end XR of the perforation PX of the photographing frame Fn passing through the detection position of the sensor PS2 to the front end YF of the perforation PY of the next photographing frame Fn + 1 and the distance therebetween. The winding speed Vo3 is calculated based on

In step S35, the calculated winding speed V
It is determined whether or not o3 is equal to or higher than a predetermined speed V5, and Vo3 is V
If it is 5 or more, it is determined that the winding speed is high, and the process proceeds to step S37 to control the drive circuit MD to control the motor M.
Is driven at a duty of 50%. On the other hand, the winding speed V
If o3 is smaller than the predetermined speed V5, the process proceeds to step S36, and it is determined whether or not the winding speed Vo3 is equal to or higher than the predetermined speed V6. Here, V5 <V6. Hoisting speed Vo3
Is equal to or higher than the predetermined speed V6, it is determined that the winding speed is medium speed, and the process proceeds to step S38, and the drive circuit MD drives the motor M with a duty of 75%. When the hoisting speed Vo3 is lower than the predetermined speed V6, it is determined that the hoisting speed is low, the process proceeds to step S39, and the drive circuit M
The motor M is driven by D with a duty of 100%.

In this way, the winding speed is measured again immediately before the stop position in the deceleration period, and the duty of the motor immediately before the stop position is reset according to the winding speed. Even if the deceleration is performed, the deceleration can be corrected to the correct deceleration with respect to the target stop position. Also, the maximum time to pass between the perforations is set as the escape time, and if the escape time does not pass between the perforations, the brake is released and the motor is driven at 100% duty. Therefore, the film does not stop midway or the film feeding speed does not suddenly decrease, and the reliability of the film feeding can be improved.

On the other hand, in step S32, the front end Y of the perforation PY of the photographing frame Fn + 1 is detected by the sensor PS2.
If F is not detected, the process proceeds to step S33, and it is determined whether or not the escape time set timer has timed out and the escape time has ended. If the escape time has not ended, the process returns to step S32 to escape. If the time has ended, it is judged that the film has stopped halfway or the feeding speed has drastically decreased, and the process proceeds to step S39, where the drive circuit MD drives the motor MD.
Is driven at a duty of 100%.

In step S40, the maximum time for the perforation PY of the photographing frame Fn + 1 to pass through the detection position of the sensor PS2 is set as the escape time in the timer, and the timer is started. In step S41, the sensor PS
It is determined whether or not the perforation detection voltage of 2 is lower than the second threshold voltage and the film detection signal is output from the comparator CP1. Sensor P
When the rear end YR of the perforation PY of the photographing frame Fn + 1 passes the detection position of S2 and the film detection signal is output from the comparator CP1, the process proceeds to step S45.
The drive circuit MD brakes the motor M to stop the film winding. FIG. 9D shows a state in which one frame of this film has been wound up. Further step S4
In step 6, the supply of power to the sensor PS2 is stopped, the process returns to step S3, and the above-described processing is repeated as long as the camera is powered on by the switch SW1.

On the other hand, in step S41, the comparator C
When the film detection signal is not output from P1, the process proceeds to step S42, and the timer determines whether or not the escape time has ended. When the escape time ends, it is determined that the film has stopped halfway or the feeding speed has suddenly decreased, and the process proceeds to step S43 to drive the motor M with a duty of 100%. Further, in step S44, it is determined again whether or not the film detection signal is output from the comparator CP1. When the film detection signal is output, the process proceeds to step S45, and the motor M is braked and stopped.

As described above, since the two sensors for perforation detection PS1 and PS2 are separately supplied with electric power only during the period in which they need to be operated, the power consumption of the battery can be saved. Also,
For two perforation detection sensors, a load resistor R for converting the sensor output current into a voltage
And the output of the sensors PS1 and PS2 from the arithmetic and control unit CP
Since U and the comparator CP1 for converting into a readable digital signal are commonly used, the number of parts is reduced and the installation space for that is not required, and the cost and the power consumption of the battery can be reduced. Furthermore, the sensors PS1 and PS2 input via the comparator CP1
Since the threshold signal for PS1 and the threshold signal for PS2 are switched based on the perforation detection result of, the digital threshold signals are sent to the D / A converter, converted into analog voltage and set in the comparator CP1, respectively. The detection level of each sensor can be set separately, and accurate perforation can be detected. Moreover, the comparator can be shared, the number of parts is reduced, and the installation space for that amount is not required. The power consumption of the battery can be reduced. Furthermore, the sensors PS1 and PS2
The digital value of the threshold voltage for
The digital value of the threshold signal of each sensor is stored in the EPROM and is read out from the memory EEPROM during the period in which each sensor needs to be operated, converted into an analog value, and the comparator CP1
Since the threshold voltage is set to, the threshold voltage can be set in advance for each sensor according to the perforation detection conditions and the characteristic difference between the sensors, and the perforation can be accurately detected.

-Second Embodiment- In the first embodiment described above, an example using two sensors for detecting perforations was shown.
In this embodiment, one sensor controls the film feed by one frame. FIG. 10 is a functional block diagram showing the configuration of the second embodiment. In the second embodiment, the sensor PS1 in the constituent equipment of the first embodiment shown in FIG. 1 is deleted, so that the same reference numerals are given to the same equipment as the equipment shown in FIG. And their description is omitted. The second embodiment uses the film shown in FIG. 2 described above, and the detection position of the sensor PS2 is the same as that of the first embodiment shown in FIG. The arithmetic and control unit CPU supplies power only during the period in which the sensor PS2 needs to be operated.

11 to 13 are flow charts showing the control program of the arithmetic and control unit CPU, and FIG. 14 is a view for explaining the film feeding operation of the second embodiment. The operation of the second embodiment will be described with reference to these drawings. When the switch SW1 is turned on and the power of the camera is turned on,
The arithmetic and control unit CPU starts executing this control program. In step S101, system initialization such as memory reset is performed by system reset. In a succeeding step S102, the PS2 is read from the EEPROM.
Read various adjustment data of the camera including the second threshold voltage for and set them. Step S10
At 3, it is determined whether or not the release button has been half-pushed by the switch SW2. If the release button has been half-pushed, the process proceeds to step S104. In step S104, the control circuit CON is instructed to perform photometry and distance measurement via the line L3, the process proceeds to step S105, and it is determined whether or not the release button has been fully pressed by the switch SW3. If the release button has not been fully pressed, the process proceeds to step S105A, and it is determined by the switch SW2 whether or not the release button is still half pressed. If the release button is still half-pressed, the process proceeds to step S105 to wait for the shutter release, and if the half-press of the release button is released, the process returns to step S103. On the other hand, when the release button is fully pressed and the shutter is released, the process proceeds to step S106 to instruct the control circuit CON to perform exposure.

In step S107, the second threshold voltage for PS2 is output to the D / A converter via the line L5, and the second threshold voltage is set in the comparator CP1. Next, in step S108, a winding command is issued to the drive circuit MD via the line L6, and the motor M is driven to start winding the film. 14
(A) shows a state where the photographing frame Fn is set to a predetermined photographing position and the exposure is completed. From this state, the next unexposed frame Fn is shown.
One frame is fed to set +1 to a predetermined photographing position, that is, one frame is started to be wound in a normal wind type camera. Step S1 after starting film winding
At 09, power is supplied to the sensor PS2 to start the perforation detection operation, and the subsequent step S110.
Then, the perforation detection voltage by the sensor PS2 exceeds the second threshold voltage, and the comparator C
It is determined whether or not the perforation detection signal is output from P1.

As shown in FIG. 14B, when the front end XF of the perforation PX of the photographing frame Fn reaches the detection position of the sensor PS2, the amount of light incident on the sensor PS2 sharply increases and the output current increases. The perforation detection voltage rises. When the perforation detection voltage exceeds the second threshold voltage, the perforation detection signal is output from the comparator CP1. That is, the detection position of the sensor PS2 is set to the shooting frame Fn.
When the front end XF of the perforation PX of No. 1 passes, the perforation detection signal is output.

When the front end XF of the perforation PX of the photographing frame Fn is detected by the sensor PS2, step S1
Proceed to 11 to start timing with the built-in timer. In a succeeding step S111A, a timer is set and started by setting a maximum time for the perforation PX of the photographing frame Fn to pass through the detection position of the sensor PS2 as an escape time. If the perforation PX does not pass the detection position of the sensor PS2 even after the elapse of this escape time, it is determined that the film has stopped midway or the film feeding speed has suddenly decreased, and the backup described later is performed. Perform processing. Then in step S112,
The perforation detection voltage of the sensor PS2 becomes lower than the second threshold voltage and the comparator CP
It is determined whether the film detection signal is output from 1.

As shown in FIG. 14C, when the rear end XR of the perforation PX of the photographing frame Fn reaches the detection position of the sensor PS2, the amount of light incident on the sensor PS2 sharply decreases and the output current decreases. The perforation detection voltage decreases. Then, when the perforation detection voltage becomes lower than the second threshold voltage,
A film detection signal is output from the comparator CP1. That is, when the rear end XR of the perforation PX of the photographing frame Fn passes the detection position of the sensor PS2, the film detection signal is output.

When the rear end XR of the perforation PX of the photographing frame Fn passes the detection position of the sensor PS2, the process proceeds to step S113, the time when the perforation PX passes the detection position of the sensor PS2 is read from the timer, and the perforation passage time and The winding speed Vo4 is obtained based on the length. In step S114, it is determined whether or not the calculated hoisting speed Vo4 is equal to or higher than a predetermined speed V7. If the hoisting speed Vo4 is equal to or higher than the predetermined time V7, it is determined that the hoisting speed is high and step S114 is performed.
In step 116, the drive circuit MD drives the motor M with a duty of 50%. On the other hand, if the hoisting speed Vo4 is lower than the predetermined speed V7, the process proceeds to step S115.
It is determined whether or not the winding speed Vo4 is equal to or higher than a predetermined speed V8. Here, V8 <V7. If the winding speed Vo4 is equal to or higher than the predetermined speed V8, the process proceeds to step S117, and the drive circuit MD drives the motor M with a duty of 75%. When the winding speed Vo4 is lower than the predetermined speed V8, the process proceeds to step S118, and the drive circuit MD drives the motor M with no duty, that is, with a duty of 100%.

On the other hand, when the film detection signal is not output from the comparator CP1 in step S112, the process proceeds to step S112A, and it is determined whether or not the timer for which the escape time has been set is up and the escape time has ended. If the escape time has not ended, the process returns to step S112, and if the perforation PX of the shooting frame Fn does not pass the detection position of the sensor PS2 even after the escape time has elapsed, the film has stopped halfway or the film feed has stopped. When it is determined that the feeding speed has drastically decreased, the process proceeds to step S118, and the drive circuit MD is controlled to drive the motor M without duty, that is, with 100% duty.

In step S119, the sensor PS
It is determined whether the perforation detection voltage of 2 exceeds the second threshold voltage and the perforation detection signal is output from the comparator CP1.
When the front end YF of the perforation PY of the next shooting frame Fn + 1 passes the detection position of the sensor PS2 and the perforation detection signal is output from the comparator CP1, the process proceeds to step S119A, and the detection position of the sensor PS2 is changed to the perforation of the shooting frame Fn + 1. The maximum time from the passage of the front end YF of the PY to the passage of the rear end YR is set in the timer as the escape time. If the perforation PY of the photographing frame Fn + 1 does not pass the detection position of the sensor PS2 even after the elapse of this escape time, it is determined that the film has stopped halfway or the film feeding speed has drastically decreased. Then, a backup process described later is executed.

In step S120, the sensor PS
It is determined whether or not the perforation detection voltage of 2 is lower than the second threshold voltage and the film detection signal is output from the comparator CP1. When the trailing edge YR of the perforation PY of the next frame Fn + 1 passes through the detection position of the sensor PS2 and the film detection signal is output from the comparator CP1, step S
In step 121, the drive circuit MD is controlled to brake the motor M to stop the film winding. Further, in step S122, the supply of power to the sensor PS2 is stopped, the process returns to step S103, and the above-described processing is repeated as long as the camera is powered on by the switch SW1.

In step S120, the comparator CP1
If the film detection signal is not output from step S1,
20A, the timer determines whether the escape time has ended. If the escape time has not ended, the process returns to step S120, and if the escape time ends, it is determined that the film has stopped halfway or the feeding speed has drastically decreased, and the process proceeds to step S120B. In step S120B, the drive circuit MD is controlled to drive the motor M with a duty of 100%. Next, in step S120C, it is determined whether or not a film detection signal is output from the comparator CP1. If a film detection signal is output, the process advances to step S121 to brake the motor M and stop film winding.

Thus, in the state shown in FIG. 14 (a), one frame of film is started to be wound, and the sensor PS2
14B, the perforation passage time from the passage of the front end XF of the perforation PX of the photographing frame Fn to the passage of the rear end XR thereof as shown in FIG. 14C is shown. Timekeeping. Then, the perforation passage speed is calculated from the passage time and the perforation length, and the duty of the motor during deceleration is set according to the passage speed. At the time when the front end XF of the perforation PX of the photographing frame Fn reaches the detection position of the sensor PS2, as shown in FIG. It is considered that the film feeding speed is constant and sufficiently stable, and the influence of mechanical rattling at the start of winding described above is eliminated, so that an accurate film feeding speed can be measured. Since the drive duty of the motor M is determined according to the accurately measured feeding speed, no matter what speed the film is wound,
Accurate deceleration can be achieved toward the target stop position.

Further, the maximum time for passing between perforations or perforations is set as an escape time. If the vehicle does not pass through those sections even after the escape time elapses, the brake is released and the motor has a duty of 100%. Since it is driven by, the film does not stop midway and the film feeding speed does not suddenly decrease, and the reliability of the film feeding can be improved.

In each of the above-described embodiments, the normal wind type camera has been described as an example. However, before filming, the film is once wound onto the camera, and the film is rewound into the cartridge while filming is performed. The present invention can be applied to a camera.

Further, in each of the above-mentioned embodiments, the film having two perforations as shown in FIG. 2 has been described as an example, but the number of perforations with respect to the photo frames is three or more. May be.

In each of the above-mentioned embodiments, three kinds of duty are set according to the winding speed, but there may be four or more kinds of duty, and the duty value is not limited to the above-mentioned embodiment. Further, the duty may be continuously changed according to the winding speed.

In each of the above-described embodiments, an example in which the escape time is set and the backup process when the escape time has elapsed is performed during the deceleration of the film. However, a predetermined escape time elapses before the deceleration of the film. However, if the passage of the film through the predetermined section is not detected at the detection position of the sensor, a predetermined backup process may be performed. Further, if the passage of the predetermined perforation is not detected at the detection position of the sensor even after the predetermined escape time has elapsed from the start of the feeding of the film, a predetermined backup process may be performed. Furthermore, the content of the backup process is not limited to the above-mentioned embodiments.

In the configuration of the above embodiment, the drive circuit M
D and the motor M constitute a feeding means, the driving circuit MD constitutes a driving means, the sensors PS1 and PS2 constitute a perforation detecting means, and the arithmetic and control unit CPU constitutes a controlling means.

[0053]

As described above, according to the present invention, at the time of feeding a frame for setting the photographing frame at a predetermined photographing position, the detecting means supplies a predetermined amount even if a predetermined time has elapsed from a predetermined time. When the perforation is not detected, or when the perforation detection means does not detect the passage of the predetermined perforation even after a predetermined time has elapsed from the start of the feeding of the film, or the perforation detection means after the predetermined time has elapsed. If the passage of the film in the predetermined section is not detected, or if the perforation detection unit does not detect the passage of the film in the predetermined section being decelerated even after the predetermined time has elapsed, the film feeding state is changed. The film stopped during feeding due to a drop in the terminal voltage of the battery or an increase in the load on the feeding mechanism. Even feeding speed decreases suddenly proper backup process performed, it is possible to improve the reliability of film feed. Further, at the time of detection of a predetermined perforation, the motor is braked to reduce the film feeding speed, and even if a predetermined time has elapsed, a predetermined section of the film being decelerated by the perforation detection means,
For example, when the passage of the perforation section or the section between the perforations is not detected, the brake is released and the driving state of the motor is changed to, for example, 100% duty.
Improves the reliability of film feeding because the film does not stop during feeding and the feeding speed does not suddenly decrease due to a decrease in battery terminal voltage and an increase in the load on the feeding mechanism. Can be made.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration of a first embodiment.

FIG. 2 is a diagram showing a positional relationship between a film and a sensor used in the first embodiment.

FIG. 3 is a flowchart showing a control program for winding one frame of film.

FIG. 4 is a flowchart showing a control program for winding one frame of film, following FIG. 3;

FIG. 5 is a flowchart showing a control program for winding one frame of film, following FIG.

FIG. 6 is a flowchart following FIG. 5, showing a control program for winding one frame of film.

FIG. 7 is a flowchart showing a control program when one frame of film is wound, following FIG. 6;

FIG. 8 is a flowchart showing a control program subsequent to FIG. 7 when winding one film frame.

FIG. 9 is a view for explaining the one-frame winding operation of the film of the first embodiment.

FIG. 10 is a functional block diagram showing the configuration of the second embodiment.

FIG. 11 is a flowchart showing a control program for winding one frame of the film of the second embodiment.

12 is a second example of the film 1 following FIG. 11. FIG.
The flowchart which shows the control program at the time of frame winding.

FIG. 13 is a second example film 1 following FIG. 12;
The flowchart which shows the control program at the time of frame winding.

FIG. 14 is a view for explaining a single frame winding operation of the film of the second embodiment.

[Explanation of symbols]

 CPU arithmetic and control unit PS1, PS2 sensor CP1 comparator R load resistor EEPROM memory MD drive circuit M motor D / A D / A converter CON control circuit

Claims (9)

[Claims] 1. A feeding means for feeding a film, a detecting means for detecting a predetermined position on the film, and a frame feeding for setting a photographing frame at a predetermined photographing position,
A camera, comprising: a control unit that changes a film feeding state by the feeding unit when a predetermined amount of feeding is not detected by the detecting unit even after a lapse of a predetermined time from a predetermined time point. Film feeder. 2. A feeding means for feeding a film, a perforation detecting means for detecting a perforation of the film, and a frame feeding for setting a photographing frame at a predetermined photographing position.
When passage of a predetermined section of the film is not detected by the perforation detection means even after a predetermined time has passed,
A film feeding apparatus for a camera, comprising: a control unit that changes a film feeding state by the feeding unit. 3. A feeding means for feeding a film, a perforation detecting means for detecting a perforation of the film, and a frame feeding for setting a photographing frame at a predetermined photographing position,
A control means for reducing the film feeding speed of the feeding means at the time of detection of the predetermined perforation by the perforation detecting means, and stopping the film feeding by the feeding means when the photographing frame reaches a predetermined photographing position. In the film feeding device of the camera, the control means feeds the film by the feeding means when the perforation detection means does not detect passage of the film being decelerated in a predetermined section even after a lapse of a predetermined time. A film feeding device for a camera, characterized in that the feeding state is changed. 4. A motor for feeding a film, in which a plurality of perforations are provided at the same position of each photographing frame, a driving means for driving this motor, a perforation detecting means for detecting perforation, and a photographing frame for a predetermined number. During frame advance to set the shooting position,
When the perforation detecting means detects a predetermined perforation, the driving means brakes the motor to reduce the film feeding speed, and when the photographing frame reaches a predetermined photographing position, the driving means stops the film feeding. In the film feeding device of the camera provided with the control means, the control means, when the passage of the film being decelerated in a predetermined section is not detected by the perforation detection means even after a predetermined time has passed, A film feeding device for a camera, characterized in that the drive state of the motor is changed while releasing the brake by the drive means. 5. The film feeding device for a camera according to claim 4, wherein the control means does not detect passage of the film being decelerated in a predetermined section by the perforation detection means even after a predetermined time has elapsed. In addition, the film feeding device for a camera, wherein the driving unit drives the motor at a duty of 100%. 6. The film feeding device for a camera according to claim 2, wherein the predetermined section of the film is a perforation section. 7. The film feeding device for a camera according to claim 2, wherein the predetermined section of the film is a section between perforations. Film feeding device. 8. The film feeding device for a camera according to claim 2, wherein the film is a film in which perforations are provided at unequal intervals. Sending device. 9. The camera film feeding apparatus according to claim 1, wherein the film is a film in which perforations are provided at unequal intervals, and the detection means detects the perforations of the film. Film feeding device.