JPH08122871A - Film feeding control device - Google Patents

Abstract

PURPOSE: To precisely frame-feed a film even when the feeding resistance torque of the film is changed. CONSTITUTION: This device has a photosensor 17 for detecting the perforations 5a, 5b of a fed film 4, a perforation detecting means 18 for shaping the waveform of the signal from the photosensor 17 and outputting it as a perforation signal, and a current value measuring circuit 24 for measuring the current value flowing from a motor driver 14 to a motor 12. A controller 15 has a supply power calculating means 19 for calculating the set value of the supply power to the motor 12 on the basis of the perforation signal, and a supply power correcting means 22 for properly correcting the set value on the basis of the measurement result of the current value measuring circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding control device for a camera, a photo printer or the like, and more particularly to a film feeding control device which detects perforations of a film and feeds the film frame by frame.

[0002]

2. Description of the Related Art Conventionally, film feeding control devices of this type have been disclosed in Japanese Patent Laid-Open Nos. 57-85040 and 57-85041.
In order to accurately stop the frame-fed film at a predetermined stop position, the motor drive state is switched from high-speed rotation to low-speed rotation as disclosed in No. Transmission type is known.

In such a deceleration feed type film feeding control device, generally, the electric power supplied to the motor is adjusted to switch the driving state of the motor, and the motor is driven before the film reaches a predetermined stop position. The deceleration feed of the film is achieved by switching the power supply to the preset high value for high speed feed to a lower value for low speed feed.

[0004]

However, in the conventional deceleration feeding type film feeding control device, an error may occur in the stop position of the film. This is because the load torque (hereinafter referred to as "feed resistance torque") that acts on the motor when feeding the film is not constant, and it is sufficient that it changes depending on the environmental temperature and the diameter of the film wound on the spool shaft. Since it is not taken into consideration, the torque of the motor becomes improper when the power supplied to the motor is switched to a lower value, and as a result, the braking distance of the film varies. In particular, the resistance torque when pulling out the film from the film cartridge (hereinafter referred to as "drawing resistance torque") varies depending on the amount of pull-out of the film, which causes the feed resistance torque of the film to be the number of pull-out pieces. It has not been considered in the past to affect the braking distance of the film by changing it according to the above. Therefore, when feeding a film of this type, the film is accurately stopped at a predetermined stop position. I couldn't do that.

The present invention has been made in view of the above circumstances, and an object of the present invention is to feed a film of a decelerating feed type capable of accurately feeding the film frame by frame even if the feeding resistance torque of the film changes. It is to provide a control device.

Further, according to the present invention, even when a film whose pull-out resistance torque of the film changes in accordance with the amount of the film drawn out is used, a slow-feeding type film feed capable of accurately frame-feeding the film. It is also an object to provide a control device.

[0007]

In order to achieve the above object, the film feeding control apparatus of the present invention comprises a motor for feeding a film on which a predetermined number of perforations are formed per frame, and a perforation detecting means for detecting the perforations. And drive control means for controlling the drive of the motor so that the film is fed frame by frame by adjusting the electric power supplied to the motor based on the detection result of the perforation detection means, and the drive control means is In the film feeding control device, which adjusts the power supply so that the driving state of the motor is switched from the high speed rotation to the low speed rotation while the film is fed by one frame, the feeding resistance at the time of frame feeding of the film is controlled. A resistance torque information providing means for providing information on torque, and a resistance torque information providing means Based on the information, it is characterized in that a correcting means for correcting the adjustment of the power supplied to the motor at the time of low speed rotation of the motor is provided.

In a specific mode, the feeding torque at the time of frame feeding includes the pull-out resistance torque of the film from the film cartridge.

In another specific mode, the resistance torque information providing means measures the current flowing into the motor when the motor rotates at a high speed during the frame feeding of the film, and the measurement result is used as the information regarding the feeding resistance torque. It is characterized by being provided.

As another specific embodiment, the drawing resistance torque of the film changes according to the number of frames fed, and the resistance torque information providing means measures the number of frames fed of the film. Then, the frame number detection unit that provides the measurement result as information about the withdrawal resistance torque and the film feeding speed when the motor rotates at high speed are measured, and the measurement result is provided as information about the withdrawal resistance torque. And a speed measurement unit.

In that case, more specifically, the film is
The pull-out resistance torque changes depending on the number of shootable images, and the resistance torque information providing means is provided with a number-of-shootable-images detecting unit that detects the number of shootable images of the film and provides the detection result as information regarding the feeding torque. It is characterized by being present.

As another specific mode, when the drive control means feeds the film by one frame, the drive of the motor is temporarily stopped while the drive state of the motor is switched from high speed rotation to low speed rotation. It is characterized in that the power supply is adjusted.

[0013]

According to the film feeding control apparatus of the present invention, the resistance torque information providing means provides the information about the feeding resistance torque at the time of frame feeding of the film, and the correction means makes the provided information. The torque of the motor can be appropriately adjusted according to the feed resistance torque of the film by correcting the adjustment by the drive control means of the electric power supplied to the motor when the motor is rotated at a low speed based on the above. Even if the resistance torque changes, it is possible to always feed the film frame with high accuracy.

Particularly, in the information provided by the resistance torque information,
With the information including the pull-out resistance torque of the film, it is possible to accurately feed the film frame by frame even when the film is used in which the pull-out resistance torque of the film changes according to the pull-out amount (the number of pull-out frames) of the film. .

When the film is fed by one frame,
If the motor drive is temporarily stopped while the motor drive state is switched from high-speed rotation to low-speed rotation, film frame feed can be performed in a shorter time than in the case of simply decelerating the motor rotation. At the same time, it is possible to take a long time to drive the motor at a high speed, and there is an advantage that a large amount of magnetic information can be recorded when a film for recording magnetic information on the film surface is used. Regarding this point, Japanese Patent Application No. 5-2 by the present applicant.
No. 58714 is described in detail.

If only the measurement result of the film feeding speed when the motor rotates at high speed is used as the information regarding the film feeding resistance torque, the influence of the change in the film drawing resistance torque can be sufficiently reflected in the control. However, if a film whose pull-out resistance torque changes depending on the amount of film drawn out is used, it is not possible to perform frame advance of the film with high accuracy.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view of a film feeding control device according to a first embodiment of the present invention, FIG. 2 is a horizontal sectional view of the film cartridge shown in FIG. 1, and FIG. 3 is a drawing resistance of the film of the film cartridge. It is a figure which shows the relationship between a torque and the number of drawing frames.

The film cartridge 1 used in this embodiment is, as shown in FIG. 2, a cartridge main body 2, a cartridge spool 3 rotatably supported by the cartridge main body 2, and a cartridge wound around the cartridge spool 3. And a film 4 to be taken in and out of the main body 2. Cartridge spool 3 and cartridge body 2
A frictional resistance is generated between the cartridge and the spool receiving portion of the cartridge 4. Therefore, as shown in FIG. 3, the pull-out resistance torque of the film 4 from the cartridge body 2 is transferred to the cartridge spool 3 as the film 4 is pulled out. Since the winding diameter of the film 4 is smaller, it increases.

As shown in FIG. 1, a film feeding control device 10
Is a take-up spool 11 for taking up the film 4 pulled out from the cartridge main body 2, a film feeding motor 12 installed inside the take-up spool 11, and a motor.
A drive transmission mechanism 13 for transmitting the drive force generated by 12 to the take-up spool 11. Motor 12 is a motor driver
The rotation speed and the generated torque are configured to change according to the power supplied from the power supply 14, and the film feed control device 10 controls the power supplied from the motor driver 14 to the motor 12. A controller 15 including a microcomputer, a RAM, a ROM, etc. for generating an adjustment instruction signal, and a power control circuit 16 for adjusting the power supplied from the motor driver 14 to the motor 12 in accordance with the instruction signal from the controller 15 are provided together. There is.

On the other hand, the film 4 has the first,
The second two perforations 5a and 5b are formed at the front end of the top. Specifically, the first perforation 5a located in front of the film 4 in the frame feeding direction.
The front edge of the second top perforation 5b is aligned with the rear edge of the top one in front of the corresponding top, and the front edge of the rear second perforation 5b is in the same straight line as the front edge of the corresponding top. They are formed so as to line up on the line.

The film feeding control device 10 further forms a photosensor 17 for photoelectrically detecting the first and second perforations 5a and 5b of the film 4, and a photoelectric signal output from the photosensor 17 by waveform shaping. A perforation detection circuit 18 that outputs to the controller 15 as a perforation signal is provided. The photo sensor 17 is of a so-called reflection type and has a perforation detection circuit.
The perforation signal output from 18 to the controller is at a low level while the first and second perforations 5a and 5b are in a position facing the sensor 17, and is at a high level otherwise. . More specifically, the sensor 17 is arranged so as to be aligned with the front edge of the exposure opening 6 in the film frame feeding direction, and the perforation signals are the front and rear edges of the first and second perforations 5a and 5b. The output level is switched when the end edge comes to a position aligned with the front end line of the exposure opening 6 on the same straight line.

The controller 15 determines the frame position of the film based on the perforation signal output from the perforation detection circuit, and calculates the set value of the power supplied from the motor driver 14 to the motor 12 according to the frame position. A calculating means 19, a feeding speed calculating means 20 for calculating the feeding speed of the film 4 at the time of high speed feeding based on the perforation signal, and a frame number calculating means 21 for calculating the number of drawn frames of the film 4 based on the perforation signal. , A power supply correction means for correcting the set value of the power supplied from the motor driver 14 to the motor 12 calculated by the power supply calculation means based on the calculated feeding speed and the number of frames
22 and. Specifically, the power supply calculation means 19 is
While the film 4 is being fed by one frame, the driving state of the motor 12 is switched in the order of high speed rotation, temporary stop, low speed rotation and stop in advance according to the frame position of the film 4 in a storage unit (not shown). It is configured to read out and output the set value of the supplied electric power stored in the motor 12, and the supplied electric power correction means 22 is particularly configured to operate the motor 12 when the motor 12 is rotated at a low speed.
The correction supply power is calculated by adding the correction value according to the feeding speed of the film 4 and the number of frames to be drawn to the set value of the supply power to the It is configured to output an instruction signal for instructing to.

Next, the operation of the film feeding control device 10 configured as described above will be described with reference to FIGS. 4 and 5. FIG. 4 is a flow chart showing a procedure for film one frame feeding by the film feeding control device, and FIG. 5 is a waveform of a perforation signal (a) at the time of film one frame feeding, electric power supplied to the motor (b) and film feeding speed. It is a figure showing an example and. 4 and 5, perforation is abbreviated as perforation.
Further, S1, S2, ... Shown below correspond to steps in the flowchart of FIG.

When the exposure completion signal (not shown) is received after the shutter release signal, the power supply calculating means 19 is operated as shown in FIG.
As shown in, the set value E1 of the electric power supplied to the motor 12 is read at the time t1. The power supply correction means 22 generates an instruction signal and corrects the motor without correcting the set value E1.
Rotate 12 at high speed. As a result, the film 4 is normally fed at a high speed V1 as shown in FIG.
1).

As soon as the film 4 starts to be fed at high speed,
The photo sensor 17 detects the trailing edge of the second perforation 5b corresponding to the exposed frame, and the perforation detection circuit 18 outputs the rising edge of the perforation signal, but the film 4 continues to be fed at high speed. After that, at time t2, the photo sensor 17 detects the front edge of the first perforation 5a corresponding to the unexposed frame, and the perforation detection circuit 18 outputs the falling edge of the perforation signal. The feeding speed calculation means 20 starts the timer count at the time when the trailing edge of the perforation signal is input (S
3). Then, at time t3, the photo sensor 17 detects the trailing edge of the first perforation 5a, and the perforation detection circuit 18 outputs the rising edge of the perforation signal.

The feeding speed calculating means 20 stops the timer count when the rising edge of the perforation signal is input (S5), and calculates the feeding speed at the time of high speed feeding of the film 4 from the counted number of timers. (S7). At the same time, the supply power calculation means 19 reads out the set value 0 of the supply power to the motor 12. The supply power correction means 22 does not correct the set value 0 and generates an instruction signal to stop the motor 12 once (S6). As a result, the film 4 takes time t4.
Stop once with. Further, the frame number calculating means 21 calculates the number of frames to be drawn out of the film 4 by incrementing the frame number counter by one step due to the rise of the perforation signal due to the detection of the trailing edge of the first perforation 5a.

After that, at time t5, the supply power calculation means 19 reads out the set value E2 of the supply power to the motor. On the other hand, the power supply correction means 22 determines whether the feeding speed of the film 4 calculated by the feeding speed calculation means 20 is faster or slower than a predetermined speed V1 (S8). A correction for increasing the set value E2 read out by the calculating means 19 is performed (S9), and when it is determined to be fast, a correction for lowering the set value E2 is performed (S11). When the feeding speed is V1, the set value E2 is left uncorrected.

At the same time, the supply power correction means 22 determines whether the number of drawn frames calculated by the number-of-frames calculation means 21 is large or small (S12), and further adds a correction value to the set value E2. The correction value to be added is large when the number of frames exceeds 30 (S13), and small when the number of frames is less than 20 (S13).
15) If the number of frames is 20 or more and 30 or less, the middle (S1
4) is set. After performing these corrections, the supply power correction means 22 generates an instruction signal, and causes the motor driver 14 to supply power according to the corrected power set value to the motor 12 to rotate the motor 12 at a low speed. As a result, the film 4 is re-fed at the low speed V2. In addition, FIG.
(C) shows a case where the set value E2 does not change as a result of the correction.

Then, at time t6, the photo sensor 17
Detects the front edge of the second perforation 5b, and the perforation detection circuit outputs the falling edge of the perforation signal. The supplied power calculation means 19 reads the set value 0 of the supplied power to the motor 12 at the time when the falling edge of the perforation signal is input. The supply power correction means 22 generates an instruction signal and stops the motor 12 without correcting the set value 0. As a result, the film 4 stops at time t6 (S18).

In the embodiment described above, when the drive state of the motor 12 is rotated at a low speed, the supply power is adjusted by the motor 12.
Is performed by controlling the amount of electric power supplied to the motor 12, but as shown in FIG. 6, the amount of electric power supplied to the motor 12 is not changed and the amount of supplied electric power is controlled by changing the pulse signal width. Modulation method may be used.

Next, a second embodiment of the present invention will be described. FIG. 7 is a schematic view of a film feeding control device according to the second embodiment.

The illustrated film feeding control device 10A is different from that of the first embodiment in that it is provided with a photographable image number detecting means 23 for detecting the photographable image number (how many images are taken) of the film cartridge. The number of recordable images detecting means 23 is
The number of possible shots of the loaded film cartridge 1 is D
It is detected from the X code or the like, and the detection result is output to the supply power correction means 22. It is known in advance that the film cartridge 1 has a different drawing resistance of the film 4 depending on the number of shootable images, and the supply power correcting means 22 stores a plurality of correction values according to the number of shootable films of the film cartridge 1. ing. The power supply correction means 22 is configured to perform the correction of the power supply set value according to the number of shootable images of the film cartridge 1 together with the above-described correction, and output an instruction signal.

Next, a third embodiment of the present invention will be described. FIG. 8 is a schematic view of a film feeding control device according to the third embodiment.

The illustrated film feeding control device 10B is provided with a current value measuring circuit 24 which measures the current flowing from the motor driver 14 into the motor 12 through the power control circuit 16 and outputs the measurement result. The point and the internal configuration of the controller 15 are different from those of the two embodiments described above. The controller 15 discriminates the frame position of the film 4 based on the perforation signal output from the perforation detection circuit 18, and reads out the set value of the electric power supplied to the motor 12 stored in advance in accordance with the frame position.
19 and the set value of the supply power to the motor 12 read by the supply power calculation means 19 (the set value when the motor 12 rotates at a low speed) is output to the motor 12 from the current value measurement circuit 24. It is provided with a supply power correction means 22 for correcting based on the measurement result of the inflow current and generating an instruction signal thereof.

The operation of this embodiment will be described below with reference to FIG. FIG. 9 is a diagram showing an example of the current (a) flowing into the motor and the electric power supplied to the motor (b) when the film is fed one frame.

The power supply calculating means 19 sets a value E0 lower than the normal set value E1 as a set value of the power supplied to the motor 12 when starting the one frame feeding (high speed feeding) of the film 4.
Read out. The supply power correction means 22 generates an instruction signal and rotates the motor 12 at high speed without correcting the set value E2. At this time, the current value measuring circuit 24 measures the current flowing into the motor 12 and outputs the measurement result. The supply power calculation means 19 changes the set value of the supply power from E2 to E1 after the inflow current to the motor 12 is in the steady state,
The supply power correction means generates the instruction signal without correcting the set value E1. As a result, the electric power supplied to the motor 12 is increased to E1.

After that, when the rising edge of the perforation signal accompanying the detection of the trailing edge of the first perforation 5a is output from the perforation detection circuit 18, the power supply calculation means 19 stops the rotation of the motor 12.
The set value 0 of the electric power supplied to the motor 12 is read. The supply power correction means 22 generates an instruction signal without correcting the set value 0, whereby the supply power to the motor 12 becomes 0, and the feeding of the film 4 is temporarily stopped. After that, the power supply calculating means 19 uses the motor 12 to rotate the motor 12 at a low speed.
The set value E2 (<E1) of the power supplied to 12 is read.

By this time, the supply power correcting means 22 determines whether the current flowing into the motor 12 (in the steady state) when the electric power of E0 is supplied to the motor 12 is large or small. The correction value for the set value E2 of the supplied electric power is calculated by discriminating from the output result of, and as an example, when the electric power flowing into the motor 12 is as large as I2, the set value E2 is corrected to E3, When the inflowing power is appropriate at I1, the instruction signals are generated without correction.
As a result, the motor 12 is supplied with the power according to the instruction signal from the power supply correction means 22, and the motor 4 is rotated at a low speed in an appropriate driving state without being affected by the fluctuation of the feed resistance torque of the film 4, and the film 4 is rotated at a low speed. To send by.

After that, when the perforation detection circuit 18 outputs the trailing edge of the perforation signal due to the detection of the front edge of the second perforation 5b, the supply power calculation means 19 causes the motor 12 to stop.
The set value 0 of the power supplied to the
22 generates an instruction signal without correcting the set value 0. This stops the power supply to the motor 12,
The motor 12 stops rotating, and the single frame feed of the film 4 is completed.

In this embodiment, when the electric power supplied to the motor 12 is the same, the value of the current flowing into the motor 12 increases as the load torque of the motor 12 increases. Motor 12
Of the inflow current value to the motor 12 when the supply power to the motor 12 is set to E0 (a value smaller than the normal supply power value E1 is used to make it easier to measure the difference in the inflow current value). Although the supply power value is corrected by, as shown in FIG. 10, when the power supplied to the motor 12 is the same, the larger the load torque of the motor 12, the later the time when the inflow current to the motor 12 becomes the steady state is delayed. The power supply may be corrected by utilizing the fact that

In the example shown in FIG. 10, when the electric power of E1 is supplied to the motor 12 to rotate the motor 12 at a high speed,
When the time until the inflow current value to I1 is as early as t1, the power value supplied to the motor 12 when the motor 12 is rotating at low speed is E2, and when it is slow as t2, the supplied power value is E3. (> E2) is set to be corrected.

By either method, it is possible to reflect the influence of the fluctuation of the pullout resistance torque of the film 4 from the cartridge body 2 on the control.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the specific modes of the embodiments and various modifications can be made. Further, the film used in each of the above-mentioned embodiments has two perforations formed per frame, but in the present invention, 135 films having eight perforations formed or one film formed per film 110. It can also be applied to a film feeding control device using a film.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view of a film cartridge.

FIG. 3 is a diagram showing the relationship between the film pullout resistance torque and the number of pullout frames.

FIG. 4 is a flowchart showing a control procedure of the first embodiment.

FIG. 5 is a diagram showing a waveform of a perforation signal (a), electric power supplied to a motor (b), and a film feeding speed (c).

FIG. 6 is a schematic configuration diagram of a second embodiment of the present invention.

FIG. 7 is a diagram showing a waveform (a) of a perforation signal, electric power supplied to a motor (b), and a film feeding speed (c).

FIG. 8 is a schematic configuration diagram of a third embodiment of the present invention.

FIG. 9 is a diagram showing a current flowing into the motor (a) and electric power supplied to the motor (b).

FIG. 10 is a diagram showing a current flowing into the motor (a) and a power supplied to the motor (b).

[Explanation of symbols]

 1 Film Cartridge 4 Film 5a First Perforation 5b Second Perforation 6 Exposure Aperture 10, 10A, 10B Film Feed Control Device 12 Motor 14 Motor Driver 15 Controller 17 Photo Sensor 18 Perforation Detection Circuit 19 Supply Power Calculation Means 20 Feed Speed detection means 21 Frame number calculation means 22 Supply power correction means 23 Detectable image number detection means 24 Current value measurement circuit

Claims (6)

[Claims] 1. A motor for feeding a film on which a predetermined number of perforations are formed per frame, a perforation detecting means for detecting the perforation, and an electric power supplied to the motor based on a detection result of the perforation detecting means. Adjust the film to 1
Drive control means for controlling the drive of the motor so that the motors are fed frame by frame, and the drive control means changes the drive state of the motor from high speed to low speed while the film is fed by one frame. In a film feeding control device for adjusting the supplied power so as to switch to rotation, a resistance torque information providing means for providing information on a feeding resistance torque at the time of frame feeding of the film, and the resistance torque information providing means. A film feeding control device comprising: a correction unit that corrects the adjustment of the electric power supplied to the motor when the motor is rotated at a low speed, based on the information provided by the unit. 2. The film feeding control device according to claim 1, wherein the feeding resistance torque at the time of frame feeding includes a pulling resistance torque of the film from a film cartridge. 3. The resistance torque information providing means measures a current flowing into the motor when the motor rotates at a high speed during frame feeding of the film, and provides the measurement result as information regarding the feed resistance torque. 3. The film feeding control device according to claim 1, wherein the film feeding control device is provided. 4. The withdrawal resistance torque of the film changes according to the number of frames fed, and the resistance torque information providing means measures the number of frames fed with the film, A frame number detection unit that provides the measurement result as information regarding the pull-out resistance torque, and a film feeding speed of the film when the motor rotates at high speed, and provides the measurement result as information regarding the feed resistance torque. The film feeding control device according to claim 2, further comprising a feeding speed measuring unit. 5. The withdrawal resistance torque of the film changes according to the number of shootable images, and the resistance torque information providing means detects the number of shootable films of the film, and the detection result is the feeding torque. 5. The film feeding control apparatus according to claim 4, further comprising: a number-of-photographable-images detecting unit which provides the information regarding the number of photographable images. 6. The drive control means sets the film to 1
7. When the frame is fed, the supply power is adjusted so that the driving of the motor is temporarily stopped while the driving state of the motor is switched from high speed rotation to low speed rotation. The film feeding control device according to any one of 1 to 5.