JPH04212943A - Equipment for handling film - Google Patents

Abstract

PURPOSE:To provide a camera film stop control device which stops each photographic picture of film, accurately at a specified position, which has a necessary minimum perforation to secure a sufficient information storing region on the film. CONSTITUTION:It comprises a first perforation detection means 1, 2 for detecting perforation provided in film, a timing means 9 for measuring the time required to feed film, a deceleration signal generation means 10 which obtains a specific timing prior to the detection of perforation by the first perforation detection means 1, 2 on the basis of results of timing means 9 and generates a deceleration signal by the obtained timing, and a feed control means 8 for decelerating a film feed speed in a film feed means 6, 7 upon receiving the deceleration signal and stopping film feed in the film feed means 6, 7 upon detection of perforation by the first perforation detection means 1, 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film stop control device for a camera that stops each photographing screen on a film at a predetermined photographing position.

0002

2. Description of the Related Art Cameras are known that record information on a magnetic recording medium coated on an information recording area of a film or reproduce information recorded on a magnetic recording medium. In this type of camera, when recording and reproducing information using a magnetic head or the like, the information recording area is provided outside the photographic screen so as not to damage the photographic screen of the film. However, perforations are provided outside the shooting screen for film feeding, and in order to ensure sufficient information storage capacity, it is necessary to minimize the number of perforations and set a wide information recording area. be.

In order to solve these problems, the present applicant has proposed a film and its feeding control device as shown in FIG. 13 (see Japanese Patent Application No. 2-173998). In this film 21, two perforations are provided at predetermined positions on the upper left and right sides of each photographing screen, and the photographing screen 3
5, perforations 35a, 35b, and shooting screen 36
and perforations 36a, 36b have an absolute positional relationship. When such a film 21 is used, the perforations that have an absolute positional relationship with each photographic screen must be stopped within a predetermined stop position range so that each photographic screen accurately faces the aperture. Therefore, in the film feeding control device, when a perforation one position before the perforation at the target stop position is detected during film feeding, the feeding motor is driven on a duty basis to reduce the film feeding speed. When the perforation at the target stop position is detected, a short brake is applied to the feeding motor to accurately stop the feed motor at the predetermined stop position.

0004

[Problem to be Solved by the Invention] However, in cameras with a high film feeding speed, even if the film feeding speed is reduced in a small section between perforations, the film feeding speed cannot be sufficiently decelerated and the target stop position cannot be reached. There is a problem with overruns.

SUMMARY OF THE INVENTION An object of the present invention is to provide a film stop control device for a camera that accurately stops each shooting screen of a film provided with the minimum necessary perforations at a predetermined stop position in order to ensure a sufficient information recording area. It's about doing.

[0006]

[Means for Solving the Problems] The invention of claim 1 will be explained with reference to FIG. 1, which is a diagram corresponding to the claims. The first perforation detection means 1 and 2 detect the perforation, the time measurement means 9 measures the time required for film feeding, and the first perforation detection means 1 and 2 detect the perforation based on the time measurement result of the time measurement means 9. a deceleration signal generating means 10 which determines a predetermined timing before detection and generates a deceleration signal at this timing; and when receiving the deceleration signal, decelerates the film feeding speed of the film feeding means 6 and 7;
The above object is achieved by providing a feeding control means 8 which stops the film feeding of the film feeding means 6, 7 when the first perforation detection means 1, 2 detects a perforation.

Further, the invention of claim 2 will be explained in conjunction with FIG. 2, which is a diagram corresponding to claims. perforation detection means 1, 2, and second perforation detection means 1, 31 which are provided at a position upstream of the first perforation detection means 1, 2 in the film feeding direction and detect perforations; When the second perforation detection means 1, 31 detect a perforation, the film feeding speed of the film feeding means 6, 7 is reduced, and when the first perforation detection means 1, 2 detect a perforation, The above object is achieved by providing a feeding control means 8A for stopping the film feeding of the film feeding means 6 and 7.

[0008]

According to claim 1, the deceleration signal generating means 10 determines a predetermined timing before the first perforation detecting means 1, 2 detects the perforation as a stop position target based on the time measurement result of the time measuring means 9. and generate a deceleration signal at this timing. The feeding control means 8 is
When this deceleration signal is received, the film feeding speed of the film feeding means 6, 7 is decelerated, and when the first perforation detection means 1, 2 detects the perforation as the stop position target, the film feeding means 6, 7 Stop the film feeding.

Further, in claim 2, the feeding control means 8A comprises:
When a perforation as a stop position target is detected by the second perforation detection means 1, 31, the film feeding speed of the film feeding means 6, 7 is decelerated, and the first perforation detection means 1, 2 detects a perforation as a stop position target. When a perforation is detected, the film feeding of the film feeding means 6 and 7 is stopped. In addition, in the section of the means for solving the above-mentioned problem and operation explaining the structure of the present invention, in order to make the present invention easier to understand, the same reference numerals as the elements of the embodiments corresponding to the reference numerals of each means are used. However, the present invention is not limited to the examples.

0010

【Example】

-First Embodiment- FIG. 3 is a block diagram showing the configuration of a first embodiment of the present invention. Reference numeral 1 denotes a photoelectric detection circuit, which detects perforations on the film using a photoelectric conversion element 2. Note that the photoelectric conversion element 2 is provided at the upper left of the aperture AP of the camera, as shown in FIG. 3 is a switch that is turned on when the shutter release (not shown) is pressed halfway; 4 is a switch that is turned on when the shutter release is fully pressed; 5 is a switch that is turned on when the back cover of the camera is closed; 6 is a switch that is turned on when the camera back is closed; This is a motor drive circuit that drives the film feeding motor 7. Furthermore, 8 is a control circuit comprised of peripheral components such as a microcomputer, timers 9 to 11, and memory 12, which executes a control program to be described later to control film feeding and the like.

FIGS. 5 and 6 show a control program for loading film into a camera and feeding the first photographic screen to a position facing the aperture. FIG. 7 is a time chart showing the operating waveforms of each part of the control device at that time. (a) shows the motor drive output waveform, (b) shows the perforation detection waveform, and (c) shows the brake operation waveform. show. Further, FIG. 8 shows the leading end of the film used in the camera according to the present invention. With reference to these figures, the operation of feeding the newly loaded film 21 by four frames 22 to 25 times and feeding the first photographing screen 26 to a position facing the aperture AP will be described. Hereinafter, among the two perforations of each photographic screen on the film 21, the upper left perforations 22a to 26a will be referred to as first perforations, and the upper right perforations 22b to 26b will be referred to as second perforations. The first perforation indicates a target stop position during film feeding. That is, if film feeding is stopped when the photoelectric conversion element 2 shown in FIG. 4 detects the first perforation of the photographing screen, the photographing screen faces the aperture AP. Conventionally, the second perforation was used to start deceleration, and the film feeding speed was decelerated when the photoelectric conversion element 2 detected the second perforation.

In step S1, it is determined whether the back cover of the camera is closed using the switch 5. If it is closed, the process proceeds to step S2, where the film feeding motor 7 is driven and feeding of the film 21 is started. At this time, since the photoelectric conversion element 2 is provided at the upper left of the aperture AP as shown in FIG. Detection starts from (time t1 in FIG. 7). In the subsequent step S3, it is determined whether or not the second perforation 23b of the second frame 23 of blank feed is detected. If detected, the process proceeds to step S4, and the timer 9 that measures the film feeding time for one frame is started (Fig. 7 time t2). Furthermore, in step S5, it is determined whether or not the second perforation 24b of the third frame 24 of blank feed is detected. If detected, the process proceeds to step S6, and the timer 9 is stopped (FIG. 7
time t3). Then, in step S7, timer 9
Film feeding time Ts (t3-
t2) is stored in the memory 12.

In step S8, a time Ts-Tp obtained by subtracting a predetermined time Tp from the feeding time Ts for one frame is set in the timer 10 and started. In the following step S9, it is determined whether the time has elapsed. When the time is up, the process proceeds to step S10, where the duty drive of the film feeding motor 7 is started and the film feeding speed is reduced (time t4 in FIG. 7). Here, in the conventional feeding control device, the film feeding motor 7 is driven on a duty basis at the time when the second perforation 25b of the fourth frame 25 is detected by the photoelectric detection circuit 1, that is, at time t5 in FIG. The feeding speed had started to decrease. In the stop control device of the present invention, the time t is earlier than the time t5 by the time Tp.
Start deceleration at 4.

Next, in step S11 of FIG. 6, the feeding confirmation timer 11 is started, and in the following step S12, it is determined whether or not the second perforation 25b of the fourth frame 25 of the blank feed is detected, that is, the film is fed normally. It is determined whether or not the data has been sent. If detected, the process proceeds to step S13; if not detected, the process proceeds to step S17. In step S13, the timer 11 is stopped (time t5 in FIG.
). Note that the timer 11 may be set to a time slightly longer than the predicted time from time t3 to time t5 in FIG. Next, in step S14, the first photographing screen 26
It is determined whether or not the first perforation 26a is detected, that is, whether it is at the target stop position. If the target stop position is detected, the process proceeds to step S15, and the duty drive of the motor 7 is stopped (time t6 in FIG. 7). Further, in step S16, the motor 7 is braked. At this time, as described above, since deceleration started earlier than before, the film feeding speed was sufficiently decelerated just before time t6, and when the brake processing at time t6 was performed, the film 21 was accurately positioned at the target stop position. can be stopped.

[0015] In step S12, the perforation 25
If b is not detected, the process advances to step S17, and it is determined whether the timer 11 has timed up. If the time has elapsed, there is some abnormality in film feeding, and the process advances to step S18 to stop the film feeding; if the time has not elapsed, the process returns to step S12. In step S19, the film feeding motor 7 is reversed to start rewinding the film 21, and in the following step S20, it is determined whether rewinding is completed. After the rewinding is completed, the motor 7 is stopped in step S21, and a warning indicating an abnormality in film feeding is outputted in step S22.

FIG. 9 is a flowchart showing a film feeding control program for each shooting. With reference to this flowchart, the feeding operation after each photographic screen on the film 21 is photographed will be explained. In step S31, switch 3
It is determined whether the shutter release is pressed halfway or not, and if the shutter release is pressed halfway, photometry and distance measurement are performed in step S32. Furthermore, in step S33, it is determined whether the shutter release is fully pressed by the switch 4,
When the button is pressed all the way down, exposure is performed in step S34. Thereafter, the deceleration start time Ts-Tp described above is set in the timer 10 in step S35, film feeding is started in step S36, and then the timer 10 is started in step S37. In step S38, it is determined whether the timer 10 has timed up, that is, whether it is the deceleration start time or not. When the deceleration start time has come, the process proceeds to step S39, and the duty drive of the motor 7 is started to decelerate the film feeding speed. . Note that the subsequent operation is similar to the operation shown in FIG. 6 described above, and the explanation will be omitted.

In this way, during the feeding after loading the film, 1
The film feeding time Ts for each frame is measured, the timer 10 is set to a time shorter than this time Ts by a predetermined time Tp, and the feeding motor 7 starts to decelerate after the time is up. By the time the perforation at the target stop position is detected, the film feeding speed has been sufficiently reduced, and high stopping accuracy can be ensured even when the film is fed at high speed.

In the above embodiment, the feeding time of one of the plurality of frames during initial film feeding was measured, but the average feeding time could also be calculated by measuring the feeding time of a plurality of frames during film feeding. Alternatively, in a pre-wind camera, after pre-feeding up to the last frame, one frame may be further fed, and the feeding time may be counted when rewinding the one frame.

Further, in the above embodiment, the feeding time Ts for one frame measured during the initial film feeding is stored in the memory 12 in order to be applied to the subsequent film feeding process. Alternatively, the contents of the memory 12 may be updated.

Incidentally, the film feeding time is easily affected by changes in the battery power supply voltage and ambient temperature, and also changes depending on the winding diameter of the spool when winding the film. Therefore, if the feeding time Ts for one frame measured during the initial feeding is used as a reference, the feeding time should be determined by taking into account changes in the power supply voltage and ambient temperature, the feeding frame number, etc. each time the film is fed. Ts may be corrected. Furthermore, the time Tp for starting deceleration may also be corrected according to the feeding time Ts. For example, if the feeding time Ts is short, the film feeding speed is high and the amount of overrun at the time of stopping is expected to be large, so the time Tp is increased to start deceleration earlier.

-Second Embodiment- FIG. 10 is a block diagram showing the configuration of a second embodiment of the present invention. Note that devices similar to those in FIGS. 3 and 4 showing the first embodiment are given the same reference numerals, and the explanation will focus on the differences. In the figure, 31 is a photoelectric conversion element, and
As shown in FIG.
The perforation on the photoelectric conversion element 1 is detected before the photoelectric conversion element 2 is detected.

FIG. 11 is a flowchart showing the feeding control program executed by the control circuit 8A, and FIG. 12 is a time chart showing the operating waveforms of each part of the control device at that time.
(a) shows the drive output waveform of the motor, (b) shows the perforation detection waveform, and (c) shows the brake operation waveform. Further, FIG. 13 shows the positional relationship between the perforations on the film and the photoelectric conversion elements 2 and 31. The operation of the second embodiment device will be explained with reference to these figures. Suppose now that the photographing screen 36 in FIG. 13 is in a position facing the aperture AP and photographing has ended. Step S41
After starting to feed the film, in step S42,
It is determined whether the photoelectric conversion element 31 has detected the second perforation 36b of the photographing screen 36, and if detected, the process advances to step S43 (time t11 in FIG. 12). Furthermore, in step S43, the photoelectric conversion element 31
It is determined whether or not the first perforation 37a of the motor 7 is detected, and if detected, the process proceeds to step S44, and the motor
(time t12 in FIG. 12)
.

Next, in step S45, it is determined whether or not the photoelectric conversion element 2 has detected the perforation at the target stop position, that is, the first perforation 37a of the next photographic screen 37. If detected, the process advances to step S46 (see FIG. 12). Time t14). After stopping the duty drive in step S46, a brake process is performed in step S47. Note that the perforation detection waveform generated at time t13 in FIG.
This is the waveform when the second perforation 36b of No. 6 is detected. Here, two perforations are placed at short intervals, that is, at the same interval as the interval between the second perforation of the photographing screen and the first perforation of the next photographing screen.
When two photoelectric conversion elements 2 and 31 are arranged, the detection waveform of the photoelectric conversion element 31 at time t12 and the detection waveform of the photoelectric conversion element 2 at time t13 overlap.

In this way, another photoelectric conversion element 3 is placed at a position where the perforations are detected earlier than the photoelectric conversion element 2.
1, and when the photoelectric conversion element 31 detects the first perforation of the next photographic screen, the feeding speed starts to be decelerated. Therefore, deceleration can be started earlier than before, and the feed speed can be started at the same position as before. At the time when a certain photoelectric conversion element 2 detects the perforation at the target stop position, the film feeding speed is sufficiently reduced, and high stopping accuracy can be ensured even if the film is fed at high speed.

In the second embodiment, the photoelectric conversion element 31 detects the first perforation of the next photographic screen and starts deceleration at this timing, but the pulse generator detects the amount of film feeding. The timing of starting deceleration may be determined based on the detected film feeding amount.

FIG. 14 is a flowchart showing another example of the feeding control program. With reference to this flowchart, a feeding operation for changing the start time of film deceleration according to the feeding time from the start of feeding to the first detected perforation will be explained. Note that, similarly to FIG. 11, FIG.
The operation after the photometry/distance measurement and exposure operations are completed for the photographing screen 36 will be explained. Film feeding is started in step S51, and in subsequent step S52, the timer 32 is started to start measuring the film feeding time. In step S53, the photoelectric conversion element 31 converts the second
It is determined whether or not the perforation 36b has been detected, and if detected, the process proceeds to step S54 and the timer 32 is stopped (time t11 in FIG. 12).

In step S55, the time measured by the timer 32, that is, the time from the start of film feeding until the photoelectric conversion element 31 detects the first perforation 36b, is determined in advance based on the reference film feeding speed. If it is less than the reference time, the process proceeds to step S57, and since the film feeding speed is faster than the reference feeding speed, duty drive is started immediately. If not, the process proceeds to step S57. Proceed to S56. In step S56, it is determined whether the photoelectric conversion element 31 has detected the first perforation 37a of the next photographic screen 37, and if detected, the process proceeds to step S57 to start duty driving. Thereafter, the process proceeds to step S45 in FIG. 11, and as described above, when the photoelectric conversion element 2 detects the perforation 37a at the target stop position, the duty drive is stopped and a brake process is performed.

In this way, the actual feeding time for each film feeding is measured and compared with the standard feeding time, and if the actual feeding time is less than the standard feeding time, after the photoelectric conversion element 31 detects the first perforation, Since the film feeding speed is immediately decelerated, even if the film feeding speed changes due to changes in the battery power supply voltage, ambient temperature, or feeding frame number, and the film feeding speed becomes faster, the film feeding speed will be reduced by that amount. It is possible to start decelerating the film feeding speed at an early point, and the photoelectric conversion element 2
At the time when the perforation at the target stop position is detected, the film feeding speed is sufficiently reduced so that the film can be accurately stopped at the predetermined position.

[0029] In the above first and second embodiments,
Although the explanation has been given using an example of a film having two perforations for the photographic screen, the number of perforations is not limited to the above embodiment, and may be one or more than three perforations for the photographic screen.

In the configuration of the above embodiment, the photoelectric detection circuit 1 and the photoelectric conversion element 2 serve as the first perforation detection means, the photoelectric detection circuit 1 and the photoelectric conversion element 31 serve as the second perforation detection means, and the motor drive circuit 6 and film feeding motor 7 serve as film feeding means,
The control circuits 8 and 8A constitute feeding control means, the timer 9 constitutes timekeeping means, and the timer 10 constitutes deceleration signal generation means.

[0031]

As described above, according to the invention of claim 1, a predetermined timing before the first perforation detection means detects a perforation is determined based on the timing result of the film feeding time, and Since the film feeding speed is decelerated at the appropriate timing, even in a camera with a fast film feeding speed, the film feeding speed can be sufficiently slowed down when the first perforation detection means detects perforations and performs brake processing. The film, which has a reduced number of perforations in order to secure the information storage area, can be accurately stopped at a predetermined stop position.

According to the second aspect of the invention, when a perforation is detected by the second perforation detection means provided upstream of the first perforation detection means in the film feeding direction, the film feed Since the feeding speed is decelerated, even in a camera with a fast film feeding speed as described above, the film feeding speed is sufficiently slowed down when the first perforation detection means detects perforations and performs brake processing. , it is possible to accurately stop a film with a reduced number of perforations at a predetermined stop position in order to secure an information storage area.

[Brief explanation of the drawing]

FIG. 1 is a claim correspondence diagram corresponding to claim 1 of the present invention.

FIG. 2 is a claim correspondence diagram corresponding to claim 2 of the present invention.

FIG. 3 is a block diagram showing the configuration of a first embodiment of the present invention.

FIG. 4 is a diagram showing the arrangement of photoelectric conversion elements with respect to the aperture of a camera.

FIG. 5 is a flowchart showing an initial feeding control program.

FIG. 6 is a flowchart showing an initial feeding control program.

7 is a diagram showing operation waveforms of various parts of the device when the control programs shown in FIGS. 5 and 6 are executed; FIG.

FIG. 8 is a diagram showing the leading end of the film used in the camera of the present invention.

FIG. 9 is a flowchart showing a film feeding control program after photographing.

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

FIG. 11 is a flowchart showing a feeding control program of the second embodiment device.

FIG. 12 is a diagram showing operation waveforms of various parts of the device when the control program shown in FIG. 11 is executed.

FIG. 13 is a diagram showing the positional relationship between a photoelectric conversion element and perforations on a film.

FIG. 14 is a flowchart showing another example of the feeding control program of the second embodiment apparatus.

[Explanation of symbols]

1 Photoelectric detection circuit 2,31 Photoelectric conversion element 6 Motor drive circuit 7 Film feeding motor 8,8A control circuit 9-11 Timer 12 Memory 21 Film

Claims (2)

[Claims] 1. A film feeding means for feeding a film, a first perforation detection means for detecting perforations provided in the film, a clocking means for counting the time required for feeding the film, and the clocking means. deceleration signal generating means for determining a predetermined timing before the first perforation detection means detects the perforation based on the timing result of and generating a deceleration signal at this timing; and upon receiving the deceleration signal; Feed control means that reduces the film feeding speed of the film feeding means and stops the film feeding of the film feeding means when the first perforation detection means detects the perforation. A camera film stop control device characterized by: 2. A film feeding means for feeding a film, a first perforation detection means for detecting perforations provided in the film, and a first perforation detection means for detecting perforations provided on the film;
A second perforation detection means is provided at a position upstream of the perforation detection means in the film feeding direction and detects the perforation, and when the second perforation detection means detects the perforation, the film is detected. Feed control means that reduces the film feeding speed of the feeding means and stops the film feeding of the film feeding means when the first perforation detection means detects the perforation. Camera film stop control device.