JPH04212944A - Film feed control device - Google Patents

Abstract

PURPOSE:To provide a camera film feed control device which stops each photographic frame of film, precisely at a specified stop position, which has a necessary minimum performation to secure a sufficient information storing region on film. CONSTITUTION:It comprises a film feed means 3, 4 for feeding film provided with perforation at a specified position outside a picture, corresponding to a photographic frame, a perforation detection means 1, 2 for detection perforation on film, and a control means 5 for stopping film feed by the film feed means 3, 4 upon detection of perforation by the perforation means 1, 2 is provided in its displacement on the upstream side in the feeding direction from a reference position, equivalent to the overrun quantity at the time of film feed stop.

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 that feeds each photographic frame on a film to 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 frames 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 51 and its feeding control device as shown in FIG. 12, for example (see Japanese Patent Application No. 2-173998). In this film 51, two perforations are provided at predetermined positions on the upper left and right sides of each photographic frame.
2 and the perforations 52a and 52b have an absolute positional relationship. When such a film 51 is used, in order to stop each photographic frame at a reference position facing the aperture, the perforations that have an absolute positional relationship with each photographic frame must be stopped within a predetermined stopping position range. . Therefore, when the film feeding control device detects the perforation one position before the perforation at the target stop position during film feeding, the feed motor is driven on duty to reduce the feeding speed, and when the perforation at the target stop position is detected, , apply a short brake to the feed motor to stop feeding the film.

0004

However, the conventional feeding control device has a problem in that even if the target stop position is detected and brake processing is performed, the film overruns the target stop position due to the inertia of the film. The purpose of the present invention is to
To provide a film feeding control device for a camera that accurately stops each photographing frame of a film provided with the minimum necessary perforations at a predetermined stop position in order to secure a sufficient information recording area.

[0005]

[Means for Solving the Problem] The invention of claim 1 will be explained with reference to FIG. 1, which is a diagram corresponding to the claims. The film feeding means 3 and 4 transport the film, the perforation detection means 1 and 2 detect the perforation of the film, and when the perforation is detected by the perforation detection means 1 and 2, the film feeding means 3 and 4 The perforation detection means 1 and 2 are biased toward the upstream side in the feeding direction from the reference position by the overrun amount of the film when the film feeding is stopped. The above object can be achieved by providing the same position. Further, according to the second aspect of the invention, the amount of deviation of the perforation detection means 1 and 2 is set to the maximum allowable value for the positional relationship between the photographic frame and the perforation. Furthermore, the invention of claim 3 provides film feeding means 3 and 4 for feeding a film provided with perforations at predetermined positions outside the screen corresponding to photographic frames, and perforation detection means 1 for detecting perforations in the film. , 2, reproducing means 31 and 32 for reproducing clock information recorded on a magnetic recording medium coated on the film, and a counting means 34 for counting the clock information reproduced by the reproducing means 31 and 32, An output means 33 converts the count value of the counting means 34 into a film feeding amount and outputs it, and when a perforation is detected by the perforation detection means 1 and 2, the film feeding by the film feeding means 3 and 4 is stopped. and control means 5A for causing the counting means 34 to start counting clock information.

[0006]

[Operation] According to claim 1, the perforation detection means 1
, 2, the control means 5 stops the film feeding by the film feeding means 3 and 4. Further, in claim 3, when a perforation is detected by the perforation detection means 1 and 2, the control means 5A stops the film feeding by the film feeding means 3 and 4, and also causes the counting means 3 to stop feeding the film.
4 starts counting clock information. Then, the output means 33 converts the count value of the counting means 34 into a film feeding amount and outputs the converted value.

[0007] In the section of the means for solving the above-mentioned problems and operations which explains the structure of the present invention, the same reference numerals as the elements of the embodiments corresponding to the reference numerals of each means are used to make the present invention easier to understand. However, the present invention is not limited to the examples.

[0008]

【Example】

-First Embodiment- FIG. 2 is a block diagram showing the configuration of a first embodiment of the present invention. A photoelectric detection circuit 1 detects perforations on the film using a photoelectric conversion element 2 such as a photoreflector. 3 is a motor drive circuit that drives the film feeding motor 4. 5 is a control circuit composed of a microcomputer and its peripheral components;
Controls film feeding, etc. Furthermore, 6 is a switch that is turned on when the shutter release is pressed halfway, and 7 is a switch that is turned on when the shutter release is pressed halfway.
A switch 8 that is turned on when the shutter release is fully pressed is a switch that is turned on when the back cover of the camera is closed.

FIG. 3 shows the positional relationship between the photoelectric conversion element 2 and the perforations on the film. In the figure, 1
Reference numeral 5 designates a part of the film used in the camera according to the present invention, and two perforations are provided for each of photographic frames 16 to 18 on the film. Perforations 16a and 16b correspond to photographing frame 16, perforations 17a and 17b correspond to photographing frame 17, and perforations 18a and 18b correspond to photographing frame 18. Further, 19 is a camera aperture, 20a and 20b are inner rails, and 21a and 21b are outer rails. A photoelectric conversion element 2 for perforation detection is provided at the upper left of the aperture 19. This photoelectric conversion element 2 is composed of a light receiving element 2a and a light emitting element 2b, and is further provided with a slit 22 to limit the emitted light flux to a narrow slit shape to improve detection accuracy. In the following, among the two perforations of each photographic frame on the film 15,
Perforation 1 on the upper left in the film feeding direction
6a to 18a are called first perforations, and upper right perforations 16b to 18b are called second perforations. As shown in the figure, the photographing frame 17 faces the aperture 19, and the left edge of the first perforation 17a is located at the center of the photoelectric conversion element 2. In the following, such a position of the photographic frame 17 will be referred to as a reference position.

FIG. 4 shows the relationship between the tolerance of the set position of the photographing frame and the mounting position of the photoelectric conversion element 2 with respect to a predetermined photographing position facing the aperture 19. (a) shows a state in which the photographic frame 17 is at the above-mentioned reference position. That is, the left edge of the first perforation 17a is located at the center of the photoelectric conversion element 2. (b) shows that the left edge of the first perforation 17a is (d) when the film is fed.
) indicates a state in which the setting position has overrun to the allowable upper limit Max. This allowable upper limit Max is a position where, if the frame exceeds this limit, there is a possibility that when the photographed frame 17 is printed, the part between the frames and the next photographed frame will be printed. (c) shows a state in which the left edge of the first perforation 17a stops at the allowable lower limit Min of the set position shown in (d) during film feeding. This allowable lower limit Mi
n is a position where if the camera stops any further forward, there is a possibility that when the photographed frame 17 is printed, the part between the frames between it and the previous photographed frame will be printed. In this way, shooting frame 17
The first perforation 1 has an absolute positional relationship with
It is necessary to feed the film 15 so that the left edge of the film 7a is located within the allowable range of the upper limit Max and the lower limit Min with respect to the reference position N as shown in (d).

(e) shows a state in which the center of the photoelectric conversion element 2 is placed at the reference position N. Photoelectric conversion element 2 is photographed frame 1
As long as the feeding of the film is stopped when the first perforation 17a of No. 7 is detected, the perforation 17
Since the left edge of a does not stop before the reference position N, the left edge of the first perforation 17a stops at a position shifted from the reference position N toward the upper limit Max. Therefore, in this case, the film 15 must be fed so that the left edge of the first perforation 17a stops between the reference position N and the upper limit Max. On the other hand (f)
shows a state in which the center of the photoelectric conversion element 2 is placed at the lower limit Min. In this case, even if the left edge of the first perforation 17a stops at the lower limit Min, it is still within the permissible range, and if overrun at the time of stopping is taken into account, the permissible range is from the lower limit Min to the upper limit Max. Therefore, in the camera according to the present invention, the photoelectric conversion element 2 is attached so that the center of the photoelectric conversion element 2 is located at the lower limit Min.

FIG. 5 is a flowchart showing a feeding control program executed by the control circuit 5. Also, Figure 6 shows
2 is a time chart showing the signal waveforms of each part of the device during film feeding, and (a) shows the drive output waveform of the motor 4;
(b) shows the perforation detection waveform of the photoelectric conversion element 2, and (c) shows the brake operation waveform. Furthermore, FIG. 7 shows the moving state of the film at each time shown in FIG.
The broken line indicates the center position of the photoelectric conversion element 2. The operation will be explained with reference to these figures. In step S1, it is determined by the switch 8 whether or not the back cover is closed. If it is closed, the process proceeds to step S2, where the film is initially fed by a predetermined number of frames. In the following step S3, switches 6 and 7
It is determined whether or not the shutter release has been operated. If the shutter release has been operated, photometry and distance measurement are performed, and based on the results, exposure processing for the first photographic frame 25 shown in FIG. 7 is performed.

[0013] When the photographing is finished, in step S5, the motor 4
is driven to start feeding the film (time t1 in FIGS. 6 and 7), and in the subsequent step S6, the photoelectric conversion element 2 converts the first perforation, that is, the first photographic frame 25.
It is determined whether the second perforation 25b is detected. If detected, the process proceeds to step S7, where the motor 4 is driven on duty to reduce the film feeding speed (time t2 in FIGS. 6 and 7). In step S8, the second perforation, that is, the first perforation of the second photographic frame 26 is processed.
It is determined whether or not the perforation 26a is detected. If detected, the process proceeds to step S9 to stop the duty drive, and further performs a brake process in step S10 (time t3 in FIGS. 6 and 7).

Brake processing is performed at time t3 in FIG. 6, but overrun occurs due to the inertia of the film.
At time t4 after the brake processing, as shown in FIG. 7, the left edge of the first perforation 26a of the photographic frame 26 is shifted from the center position of the photoelectric conversion element 2 in the film feeding direction and has stopped. However, as mentioned above, taking into account the overrun caused by the inertia of the film, the photoelectric conversion element 2
are arranged so that the center thereof is at the allowable lower limit Min position shown in FIG. 4(d), so the perforation 26a
The left edge of is stopped within the tolerance range with respect to the reference position N. In other words, the photographic frame 26 is set within the permissible range with respect to the reference position N.

As described above, since the center of the photoelectric conversion element 2 is offset from the reference position N to the upstream side in the film feeding direction by the overrun amount of the film when the film feeding is stopped, It is possible to accurately stop the photographic frame at a predetermined photographing position when feeding is stopped. Further, even if the overrun amount changes depending on the battery voltage, ambient temperature, etc., the photographic frame can be accurately stopped within the allowable range.

-Second Embodiment- FIG. 8 is a block diagram showing the configuration of a second embodiment of the present invention. Note that elements similar to those shown in FIG. 2 are given the same reference numerals, and the explanation will focus on the differences. A recording/reproducing circuit 31 records information on a magnetic recording medium coated on a film via a magnetic head 32, or reproduces information previously recorded on the magnetic recording medium. A display 33 reproduces magnetic clock information recorded at equal intervals on the film at a recording density of 10 bits/mm, for example, and displays the result of counting. Note that this display 33 is
It does not need to be built into the camera body; for example, the magnetic clock information may be output from the camera to an external display device and displayed. The control circuit 5A includes a counter 34 and controls the above-mentioned film feeding, as well as information recording/reproduction and display control.

FIG. 9 shows a feeding and recording/playback control program executed by the control circuit 5A. Note that the processing up to step S10 of this program is performed in step S of FIG.
The process from step S1 to step S10 is the same as the process from step S11 to step S10, and the process from step S11 onward will be described here. Also,
This control program is executed in the adjustment confirmation process after manufacturing the camera according to the present invention in order to confirm whether the center of the photoelectric conversion element 2 is accurately placed at the allowable lower limit Min position with respect to the reference position N mentioned above. Ru. Therefore, the exposure process in step S4 in FIG. 5 may be omitted by providing a test switch or the like without actually performing the exposure operation. Furthermore, at this time, an adjustment-only film is used in which magnetic clock information is recorded on a magnetic recording medium on the film. FIG. 10 is a time chart showing the operating waveforms of each part of the device during film feeding control, in which (a) shows the drive output waveform of the motor, (b) shows the perforation detection waveform, and (c) shows the brake The operating waveform of (d
) indicates the reproduced waveform of magnetic clock information.

After the motor 4 is braked in step S10, the process advances to step S11, where the recording/reproducing circuit 3
1, and the counter 34 starts counting (at time t in FIG. 10).
5). That is, the overrun amount starts counting immediately after the second perforation is detected. In the following step S12, it is determined whether there is magnetic clock information, and if there is no clock information, it is determined that the film has completely stopped, and the process proceeds to step S13, where the count value is converted into the overrun distance of the film and output. .

FIG. 11 shows the state of the film at the position facing the aperture after executing the above control program. At the top of the outer rail 21a of the camera, indicators 41a, 41b, and 41c are provided to indicate the positions of the reference position N, the allowable upper limit Max, and the allowable lower limit Min. Can be installed according to 41c. After stopping the feeding of the film 42, the position of the left edge of the first perforation 43 is determined by indicators 41a to 41.
c, and the positions of the left edges are index 41b and index 41c.
If it is between , it means that the photographic frame is set within the range between the allowable upper limit Max and the allowable lower limit Min with respect to the reference position N. Note that, for example, if the allowable range is +1 mm to -1 mm, it can be sufficiently confirmed visually.

Now, even though the counter 34 has counted an overrun amount of +1 mm, the actual first
If the left edge of the perforation 43 does not reach the index 41a, the center of the photoelectric conversion element 2 during manufacturing is at the lower limit M.
It can be seen that it was installed shifted to the front side from the in position. In this attached state, the film becomes extremely heavy and the feeding speed decreases, and unless an overrun occurs when the film is stopped, the photographic frame will not be set within the allowable range of the reference position N.

In this way, when the second perforation is detected, the brake process is performed to stop the film feeding, and at the same time, the magnetic clock information on the film is reproduced and counted to calculate the amount of film overrun. Since the measurement is carried out, it is possible to easily check whether the photoelectric conversion element 2 is attached to the predetermined position, and the accuracy of setting the shooting frame can be improved by the photoelectric conversion element 2 being accurately attached to the predetermined position. .

In the configuration of the above embodiment, the photoelectric conversion element 2 and the photoelectric detection circuit 1 function as a perforation detection circuit, the motor drive circuit 3 and film feeding motor 4 function as a film feeding means, and the control circuits 5 and 5A control the perforation detection circuit. means,
The recording and reproducing circuit 31 and the magnetic head 32 serve as reproducing means,
The counter 34 constitutes a counting means, and the display 33 constitutes a display means.

[0023]

As explained above, according to the invention of claim 1, the perforation detection means is provided so as to be deviated upstream in the film feeding direction from the reference position by the overrun amount of the film when film feeding is stopped. As a result, the photographic frame can be accurately fed to a predetermined photographing position. Further, according to the invention of claim 2, since the amount of deviation of the perforation is set to the maximum allowable value for the positional relationship between the photographing frame and the perforation, the amount of overrun when the feeding is stopped is determined by the power supply voltage, ambient temperature, etc. Even if the photographic frame changes, the photographing frame can be accurately fed within the permissible range of the predetermined photographing position. Furthermore, according to the invention of claim 3, when a perforation is detected, a brake process is performed to stop film feeding, and at the same time, magnetic clock information on the film is reproduced and counted, and converted into an overrun amount of the film. Since the perforation detecting means is outputted in the same manner, it is possible to easily determine whether the perforation detecting means is installed in a wrong position, and it is also possible to improve the accuracy of setting the photographing frame to the photographing position.

[Brief explanation of the drawing]

FIG. 1 is a complaint correspondence diagram.

FIG. 2 is a block diagram showing the configuration of a first embodiment of the present invention.

FIG. 3 is a diagram showing the positional relationship between a photoelectric conversion element and perforations on a film.

FIG. 4 is a diagram showing the relationship between the tolerance of the set position of the photographing frame and the mounting position of the photoelectric conversion element with respect to a predetermined photographing position facing the aperture.

FIG. 5 is a flowchart showing a feeding control program of the first embodiment.

FIG. 6 is a time chart showing operation waveforms of various parts of the apparatus in the first embodiment during film feeding.

FIG. 7 is a diagram showing a film feeding state in the first embodiment.

FIG. 8 is a block diagram showing the configuration of a second embodiment of the present invention.

FIG. 9 is a flowchart showing a feeding control program of a second embodiment.

FIG. 10 is a time chart showing operation waveforms of various parts of the apparatus according to the second embodiment during film feeding.

FIG. 11 is a diagram showing the film feeding results of the second example.

FIG. 12 is a diagram showing a film provided with the minimum necessary perforations to ensure information recording capacity.

[Explanation of symbols]

1 Photoelectric detection circuit 2 Photoelectric conversion element 2a Light receiving element 2b Light emitting element 3 Motor drive circuit 4 Film feeding motor 5, 5A Control circuit 15, 51 Films 16 to 18, 25, 26, 52 Photographing frames 16a to 18
a, 16b-18b, 25a, 25b, 26a, 43,
52a, 52b Perforation 31 Recording/reproducing circuit 32 Magnetic head 33 Display 34 Counter

Claims (3)

[Claims] 1. Film feeding means for feeding a film having perforations provided at predetermined positions outside the screen corresponding to photographic frames; perforation detection means for detecting the perforations of the film; and the perforation detection means. and a control means for stopping the film feeding by the film feeding means when the perforation is detected by the perforation, the perforation detecting means is configured to control the film feeding when the perforation is detected by the film feeding means. 1. A film feeding control device, characterized in that the film feeding control device is provided so as to be deviated upstream in the feeding direction from a reference position by an overrun amount. 2. The film feeding control device according to claim 1, wherein the amount of deviation of the perforation detection means is:
A film feeding control device characterized in that the value is a maximum allowable value for the positional relationship between the photographic frame and the perforation. 3. A film feeding means for feeding a film having perforations provided at predetermined positions outside the screen corresponding to photographic frames; a perforation detection means for detecting perforations on the film; A reproducing means for reproducing clock information recorded on a coated magnetic recording medium, a counting means for counting the clock information reproduced by the reproducing means, and a count value of the counting means is converted into a film feeding amount. an output means for outputting the perforation, and when the perforation is detected by the perforation detection means,
A film feeding control device comprising: control means for stopping film feeding by the film feeding means and for starting counting of the clock information by the counting means.