JPH063737A - Photographic film feeding controller - Google Patents

Abstract

PURPOSE:To surely detect the position of film even when a film leader part flaps by making the actuation of a film feeding monitoring means invalid until the film leader part is engaged with a take-up axis in the case of initially feeding the film. CONSTITUTION:A perforation group is formed on the film leader part and engaged with the pawl of the take-up axis 20 of a camera. The perforation is detected by a sensor 27, and a perforation signal is inputted in a microcomputer 23 from a perforation signal generator 28, then the feed length of the film is monitored. In the initial feeding operation of the film, the read of the perforation signal is made invalid for a fixed time after driving and normally rotating a motor 21. The time when the perforation group of the leader part passes the position of the sensor 27 is set to be a fixed time, and the time is measured according to the counted value of encoder pulses. In the case of attaining the fixed number of counts set in a ROM 34, the read of the perforation signal is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film feeding control device for controlling the feeding of a film by detecting a perforation for positioning a frame of the film.

[0002]

2. Description of the Related Art Conventionally, a photographic film feeding control device for a camera has been disclosed in JP-A-3-171614 and JP-A-3-1819.
No. 45, etc., a perforation for detecting the leader portion, a perforation for frame positioning, and a perforation group for detecting the end portion, which are provided in the leader portion, the intermediate portion, and the end portion of the photographic film, It is known to provide a sensor for detecting the position of the photographic film, and determine the position of the photographic film passing through the sensor based on the perforation signal obtained from the sensor when the film is fed.

[0003]

By the way, Japanese Patent Laid-Open No. 1-
As described in Japanese Patent No. 21862, etc., the tip of the photo film is stored in advance in the cartridge main body, loaded into the camera, and the spool is rotated in the film feeding direction by the film feeding control device on the camera side. Photograph in which the film is fed from the tip to the outside of the film cartridge main body When the film cartridge is used in the film feeding control device described above, the film leader portion surely engages with the take-up shaft of the film feeding control device. During that period, the reader portion is fed while swinging, so that the position of the photographic film passing through the sensor cannot be reliably determined based on the perforation signal obtained from the sensor.

The present invention provides a film feeding control device capable of surely detecting the position of a photographic film on the basis of a perforation signal obtained from a sensor even if the film leader flickers during the initial feeding of the film. The purpose is to do.

[0005]

In order to achieve the above object, according to the invention as set forth in claim 1, spool driving means for feeding the photographic film wound around the spool to the outside of the cartridge by rotating the spool inside the cartridge. And a feeding monitoring means for detecting the perforation provided at a predetermined portion of the photo film to monitor the feeding length of the photo film, and the feeding driving means after starting the driving of the spool driving means during the initial feeding operation of the film. It comprises a control means for invalidating the operation of the monitoring means for a certain period of time or until a certain length of time has passed.

According to the second aspect of the present invention, a driving means for feeding a photographic film provided with one perforation for each frame and an encoding pulse for generating an encode pulse each time the photographic film is fed for a fixed length. A pulse generating means, a counting means for counting the pulses obtained from the encode pulse generating means, a single frame feeding stopping means for detecting the perforation and stopping the driving of the driving means, and a film single frame feeding operation. After the driving of the driving means is started, the driving of the driving means is switched to the deceleration driving when the count of the counting means reaches a certain number of encode pulses according to the length shorter than the film one frame feeding length, and thereafter. And a control means for stopping the drive of the drive means by the one-frame feeding stop means. Than it is.

[0007]

FIG. 2 shows a photographic film cartridge 2 used in the film feeding control apparatus of the present invention, showing a state in which a photographic film 4 is pulled out from a cartridge main body 3. This photo film cartridge 2 has a spool 6 in advance.
With the end portion 7 of the photographic film 4 engaged, the spool 6 is wound so that the leader portion 5 of the photographic film 4 is housed in the cartridge body 3, and the spool 6 is rotated in the film feeding direction. As a result, the photographic film 4 is sent out from the reader unit 5 to the outside of the cartridge body 3.

A first perforation group 9 and a second perforation group 10 are provided in the leader portion 5 of the photographic film.
And are formed. First perforation group 9,1
The reference numeral 0 indicates that four perforations 8 are continuously arranged at short intervals, and the perforations 8 are engaged with the claws of the winding shaft of the camera. The second perforation group 10 is
Four perforations 8 are arranged in a row at short intervals, and the perforations 8 are to be engaged with the claws of the take-up shaft of a printer or the like after the portion having the first perforation group 9 is cut off at the developing station. is there.

In the middle portion 11 of the photographic film 4, one perforation 8 is provided corresponding to each of the photographed frames 12.
Are arranged at regular intervals at long intervals, and further, in the terminal end portion 14 including the final photographing frame 13, three perforation groups 15 for film end portion detection are arranged in succession at short intervals. Is provided. Furthermore, a spool 6 is attached to the end portion 7 of the photographic film 4.
There is provided a first group of locking holes 16 that is locked to the second locking hole group 17 that is locked to the spool of the return container after the development processing. In addition, these leader section 5, middle section 11,
The perforations 8 provided on the end portion 14 and the end portion 14 are provided on the same side in a straight line in the film width direction.

FIG. 3 shows an electrical schematic of the film feeding control device of the camera. The film feeding system of this film feeding control device is such that the photographic film cartridge 2 is loaded, and immediately after the back cover is closed, the photographic film 4 is once wound up and pulled out from the cartridge body 3, and then the photographed frame is taken out. A prewinding method is used in which the image is taken from the end portion 14 side while being rewound into the main body 3.

The above-described rotation of the winding shaft 20 is performed by the winding shaft 20.
It is performed by the motor 21 built in the. The motor 21 is connected via a motor driver 22 to a microcomputer 23 that controls the sequence of the camera, and its rotation and rotation direction are controlled. The rotation of the motor 21 is transmitted to the fork 25 that engages with the spool 6 via the feed transmission device 24. When the photo film 4 is wound on the winding shaft 20, the motor 21 is driven in the normal direction, and when the photo film 4 is wound on the spool 20, the motor 21 is driven in the reverse direction.

An aperture 26 is located between the winding shaft 20 and the loading chamber, and a sensor 27 for detecting the perforation 8 of the photographic film 4 is provided near the aperture 26. This sensor 27
Is, for example, L that emits infrared light toward the photographic film 4.
It is composed of an ED and a phototransistor which receives the reflected light from the photographic film 4. The sensor 27 is connected to the microcomputer 23 via the perforation signal generator 28.
It is connected to the. When the perforation 8 is detected, the perforation signal is input from the perforation signal generator 28 to the microcomputer 23.

As shown in FIG. 4, the perforation signal is at a high level (hereinafter referred to as "H") when the perforation 8 is facing the position of the sensor 27, and is low when the non-perforation portion is facing. It becomes a level (hereinafter referred to as “L”). Then, when the front edge of the perforation 8 in the traveling direction passes through the sensor 27, the perforation signal rises from “L” to “H”, and when the rear edge of the perforation 8 in the traveling direction passes through the sensor 27, The signal falls from "H" to "L".

The microcomputer 23 counts the perforation signal with a timer counter. For example, the time Tp for reading the perforation signal at "H" (the time for which the perforation width has passed) and the perforation signal for "L" are read. The position of the photographic film 4 facing the sensor 27 is detected by the duty ratio with respect to time (time after passing the perforation interval) Tf. It should be noted that, of the perforation signals shown in FIG.
(N + 1), Pf (n + 2), and Pf (n + 3) are
It is a perforation signal obtained when the perforation group 15 for detecting the end passes through the sensor 27.

Further, the microcomputer 23 counts with the film counter when it receives the rising portion of the perforation signal. The film counter counts the film count in the addition mode when the motor 21 is controlled in the forward direction, and performs the film count in the subtraction mode when the motor 21 is controlled in the reverse direction.

A driven roller 29 is in contact with the photographic film 4 and rotates without slipping when the film is fed. An encode plate 30 is connected to the driven roller 29,
It rotates integrally with the driven roller 29. The encode plate 30 is a disc formed by radially forming slits at a constant pitch, and its rotation is monitored by a photo interrupter 31. An encode pulse generator 32 is connected to the photo interrupter 31, and an encode pulse is input to the microcomputer 23 every time the photo interrupter 32 detects a slit of the encode plate 30. Since the driven roller 29 is rotated following the photographic film 4 as described above, the encode pulse is generated every time the photographic film 4 reaches a certain feeding length. A film count display unit 33 and a ROM 34 storing a control program and the like are connected to the microcomputer 23.

The operation of the photographic film feeding control device constructed as described above will be described with reference to the flow chart shown in FIG. The photographic film cartridge 2 is loaded into the loading chamber of the camera, and the back cover is closed. In conjunction with this closing operation, the microcomputer 23 executes the film winding operation shown in FIG. In this sequence, the motor 21 is reversely driven for a certain period of time in order to reliably feed the photo film 4 from the cartridge body 3, and the photo film 4 is wound around the spool 6. This tightening operation is performed by the motor 2
After a certain period of time has passed since the driving of No. 1, the driving of the motor 21 is stopped and the process is completed.

Next, in executing the film preliminary feeding operation shown in FIG. 7, first, the film initial feeding operation shown in FIG. 1 is executed. The motor 2 is used for the initial film feeding operation.
This is a sequence in which the reading of the perforation signal is invalidated for a certain period of time after 1 is normally driven. The fixed time at this time is the time when the first and second perforation groups 9 and 10 of the photographic film 2 have passed the position of the sensor 27, and the measurement is performed by the count value of the encoder pulse value. RAM
A count value corresponding to a fixed time is set in advance as a constant (B) in 34. When the count value (A) of the encoder pulse reaches the constant (B), the microcomputer 23 outputs the perforation signal. Start reading.

When the reading of the perforation signal is started, the film counter counts the rising edge of the perforation signal and the sequence for determining the end of the film is executed. For counting the perforation signal, the film counter is set to the addition mode, "1" is added every time the rising edge of the perforation signal is read, and the count value (A) is displayed on the film count display unit 33.
The film end determination is made by comparing the duty ratios described above.

For example, as shown in FIG. 4, the time Tp when the perforation signal is read at "H" is n, n + in order from the left.
1, n + 2, n + 3, n + 4, and the time Tf at which the perforation signal is read at “L” is n, n + 1,
In the case of n + 2, n + 3, and n + 4, the perforation signal Pf
When the rising edge of (n) is received, Tp (n) /
The duty ratio is calculated from the formula [Tp (n) + Tf (n)]. Similarly, the duty ratio when the rising edge of the perforation signal Pf (n + 1) is received is Tp (n + 1) /
It is calculated by [Tp (n + 1) + Tf (n + 1)]. Then, these duty ratios are compared with a predetermined constant, and when the duty ratio is equal to or larger than the constant, it is determined that the film is terminated. When the microcomputer 23 determines that it is the end of the film, it sends a motor stop signal to the motor driver 22.

Although the drive of the motor 21 is stopped by the motor stop signal, the motor drive during the prewind is controlled by high speed rotation, so that it may not be stopped instantaneously. Therefore, as shown in FIG. 8, the microcomputer 23 executes the overrun detection operation to detect the overrun. In the overrun detection operation, as shown in FIG. 8, after the motor stop signal is transmitted, the encoder pulses for the overrun are counted, and this count value (C)
Remember.

Next, a film frame setting operation is executed.
In the film coset operation, first, the motor 21 is driven in the reverse direction, the encoder pulses are counted, the count (D) reaches the above-described count (C) for the overrun, and then the rising edge of the perforation signal is read. Then, a motor stop signal is sent to the motor driver 22. As a result, the final shooting frame 12 of the photographic film 4 is set in the aperture 26.

After that, the exposure completion signal is sent from the microcomputer 2 every time the camera releases the shutter.
3 and then the motor 2 as shown in FIG.
1 is reversely driven, and a one-frame feed operation is performed in which it is stopped upon receipt of the next rising edge of the perforation signal. In this one-frame feeding operation, in order to improve the speed of film one-frame feeding and the stopping accuracy, brake control is performed to decelerate and stop the rotation of the motor 21 until the next rising of the perforation signal is received.

The constant (F) shown in the figure is set to a pulse number slightly smaller than the encoder pulse number (Nf) generated during the time Tf of the perforation signal which becomes "L", and the motor 21 is driven in reverse. After that, the encoder pulse is counted, and when the counter value (E) reaches a constant (F), the motor 21 is decelerated. Then, by reading the rising edge of the perforation signal, a stop signal is sent to the motor driver.

At this time, the film counter in the subtraction mode counts each time it receives the rising edge of the perforation signal. As a result, the unexposed shooting frames 12 are sequentially set in the aperture 26 while the exposed shooting frames 12 are caught in the cartridge main body 3. Then, when the count (A) in the film counter becomes “0”, the film winding operation is executed, the motor 21 is reversely driven for a certain time, and after a certain time elapses after the input of the encoder pulse is not obtained. The motor 21 is stopped. As a result, the exposed photographic film 4 is in a state of being completely caught in the cartridge main body 3.

As a method of detecting the end portion 15 of the photographic film 4, in the above-described embodiment, the output duty ratio of the perforation signal is used for determination. However, as another method, the output duty ratio of the encoder is used for determination. Good. In this case, the microcomputer 23 monitors the encoder pulse according to the change of the perforation signal, and the encoder pulse number (Np) generated during the time (Tp) of the perforation signal which becomes “H”, The sensor 27 is determined by the duty ratio with the number of encoder pulses (Nf) generated during the time (Tf) of the perforation signal that becomes “L”.
The position of the film 7 facing the is detected.

As another method, the number of encoder pulses (Np) may be compared with a predetermined constant to make a determination, or when the relational expression shown in the following equation is satisfied, the film end is determined. Good. [Encoder pulse number (Np)] × K ≧ [encoder pulse number (Nf)] K is an appropriate value of 1 or more.

Further, in the above-described embodiment, after the motor 21 is driven in the normal direction, the fixed time measurement for invalidating the reading of the perforation signal is performed by the count value of the encoder pulse value, but as another method. May be measured by the count value of the timer count after the motor 21 is normally driven as shown in FIG.

Further, in the above-described embodiment, in the sequence of the overrun detection operation, the photographic film 2 is counted by counting the encoder pulses output after the motor is stopped.
The overrun amount is detected, but the overrun amount may be detected by counting the rising edge of the perforation signal output after the motor is stopped as shown in FIG. In this case, as shown in FIG. 13, the motor 21 may be controlled so as to return the count of the perforation signal described above.

The photographic film feeding control device described in the above embodiment has been described as an example used in a camera.
The photographic film feeding control device of the present invention can obtain similar effects not only in a camera but also in a device for feeding a film such as a printer.

[0031]

As described above, according to the present invention, since the control means disables the operation of the feeding monitoring means for a certain period of time after the spool driving means is activated, for example, the photographic film is operated during the initial feeding operation of the film. It is possible to prevent the problem that the feeding monitoring means erroneously detects the signal part of the photo film due to the fluttering of the leader part of the photo film, and the position of the photo film can be detected more reliably. .

[Brief description of drawings]

FIG. 1 is a flowchart showing a film initial feeding operation.

FIG. 2 is a plan view showing a photographic film cartridge.

FIG. 3 is a diagram showing an outline of a film feeding control device.

FIG. 4 is a time chart showing a relationship between a perforation signal and an encoder pulse.

FIG. 5 is a flowchart showing the overall operation of the film feeding control device.

FIG. 6 is a flowchart showing a film winding operation.

FIG. 7 is a flowchart showing a film preliminary feeding operation.

FIG. 8 is a flowchart showing an overrun detection operation.

FIG. 9 is a flowchart showing a film frame setting operation.

FIG. 10 is a flowchart showing a one-frame feeding operation.

FIG. 11 is a flowchart showing another example of the film initial feeding operation.

FIG. 12 is a flowchart showing another example of the overrun detection operation.

FIG. 13 is a flowchart showing another example of the film frame setting operation.

[Explanation of symbols]

 5 Reader Unit 20 Winding Shaft 21 Motor 23 Microcomputer 27 Sensor

Claims (2)

[Claims] 1. A spool driving means for feeding a photo film wound on the spool to the outside of the patrone by rotating a spool in the patrone, and a perforation provided at a predetermined portion of the photo film to detect the photo film. A feeding monitoring means for monitoring the feeding length,
Photo film feeding, characterized in that it comprises a control means for invalidating the operation of the feeding monitoring means after starting the driving of the spool driving means during the initial feeding operation of the film for a certain time or until a certain length of time passes. Transmission control device. 2. A drive means for feeding a photographic film provided with one perforation for each frame, an encode pulse generating means for generating an encode pulse each time the photographic film is fed for a fixed length, and an encode pulse generating means. Counting means for counting the pulses obtained from the means, one frame feeding stopping means for detecting the perforation and stopping the driving of the driving means, and the film 1
After the driving of the driving means is started during the frame feeding operation, the driving of the driving means is started when the count of the counting means reaches a certain number of encode pulses corresponding to a length shorter than the film one frame feeding length. A photographic film feeding control device comprising: a control means for switching to deceleration driving, and thereafter, stopping the driving of the driving means by the one-frame feeding stopping means.