JPS62186241A - Film winding controller for camera - Google Patents

Abstract

PURPOSE:To prevent picture quality from deterioration due to the bending habit of a film by changing the quantity of film winding when the film is left as it is for a long period without film sending after photographing to transfer the bent part f the film to the outside of a photographing screen. CONSTITUTION:When a winding signal 7 is inputted under the 'H' level of the output Q of a flip flop (FF)15, a counter 11 counts up 8 sending pulses, and even if the terminals D, C are turned to the 'H' and 'L' levels respectively, the output of an exclusive OR circuit 16 is turned to the 'H' level, so that the output of an AND circuit 18 is turned to the 'L' level and no reset input is applied to an FF13. Thereby, a film winding motor 28 is continuously driven. When the counter 11 counts up 12 sending pulses, the terminals D, C and the output of the AND18 are turned to the 'H' level, a reset input is applied to the FF13 and its output Q is turned to the 'L' level, the driving of the motor 28 is stopped, and the output Q of the FF15 is turned to the 'L' level. Consequently, the film is wound up excessively by 4 sending pulses and the bent part is sent to the outside of the photographing screen 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a film winding control device for controlling the winding of a film loaded in a camera.

[Description of the Prior Art] For example, in a camera using prony film, a film is provided between the film supply spool and the film take-up spool in order to make the film storage chamber more compact and to apply appropriate tension to the film. The film is configured so that the direction of transport of the film is turned back by a small-diameter guide roller. Therefore, if the film is left open for a long time without being wound up while still being loaded, the portion of the film folded back by the guide roller may become bent. When such a bend occurs, if the bent part enters the photographic screen during winding of the film, the flatness of the photographic screen will be impaired and the image quality of the photographed photograph will deteriorate.

[Object of the Invention] The present invention has been made based on the above-mentioned viewpoints, and an object of the present invention is to provide a film winding control device that can prevent deterioration in image quality due to film curvature.

[Means for Achieving the Object] The present invention provides a device provided in a camera that has a film transport path in which the film to be transported is bent by a guide member, and a film winding means for winding the film through this transport path. means for detecting that the next photographing has not been performed for a predetermined period of time after photographing, and controlling the film winding means so that the portion of the film that was in contact with the guide member is removed from the photographing screen upon this detection. The above object is achieved by a film winding control device for a camera having means for.

[Embodiment of the Invention] FIGS. 1 and 2 are configuration diagrams showing an embodiment of the present invention, in which the terminal X shown in FIG. Ru.

The film transport path is shown in Figure 2 of these figures. The film transport path includes a supply spool l, a first guide roller 2. A second guide roller 3 and a take-up spool 4 are provided, and the film 5 is wound onto the take-up spool 4 from the supply spool 1 via the guide roller 2.3.

As soon as the distance between the supply spool 1 and the take-up spool 4 is narrower than the distance between the guide rollers 2 and 3, the film 5 is bent so as to be folded back by the guide rollers 2 and 3. Therefore, if the film 5 is left for a long time without being transferred, the guide roller 2.
3, the portion of the film 5 that is bent will have a tendency to bend. As the film 5 is transferred from the first guide roller 2 toward the second guide roller 3 as shown by the arrow in the figure, the curved portion of the first guide roller 2 created by the idle roller 2 is bent by the next guide roller 2. By frame-by-frame feeding, the camera enters the photographic screen 5a between the first guide roller 2 and the second guide roller 3. In this example, as will become clear from the following description, the film is advanced so that the curved portion is outside the photographic screen 5a.

In FIG. 1, 6 is a winding signal input terminal to which a winding signal 7 is input.0 The winding signal 7 is given at the end of exposure of the camera. It is connected to the trigger input terminal of the timer circuit 9, and
It is connected to the reset terminal of the binary counter 11 via the differentiating circuit IO, and further connected to the set terminal of the flip-flop 13 via the differentiating circuit 12.

The timer circuit 9 is a timer that repeats reset and start every time the hoisting signal 7 is input, and continues to output H level as long as the hoisting signal 7 is input within a predetermined time, Since there is no input of signal 7, its output becomes L level. The predetermined time of the timer circuit 9 is set based on the elapse of time during which the film becomes bent, and is determined experimentally in consideration of the ambient temperature and the diameter of the guide roller. is set to An output terminal of the timer circuit 9 is connected to a set terminal of a flip-flop 15 via an inverter 14. The Q output terminal of the flip-flop 15 is connected to one input terminal of the Ex-OR 16. flip flop 15
The Q output of is at the L level while the timer circuit 9 is giving the H level output, and is inverted to the H level when the output of the timer circuit 9 becomes the L level.

Ex with the Q output of flip-flop 15 as one input
- The other input terminal of OR16 is the binary counter 11
4-bit parallel output terminals A and B.

It is connected to the C terminal of C and D. Ex-OR1
The output terminal of 6 is AND 1 g via the inverter 17.
is connected to one input terminal of the

The other input terminal of AND l 8 is connected to the D terminal of counter Il. The output terminal of AND18 is connected to the reset terminal of flip-flop 13 via a differentiating circuit 19, so that flip-flop 13 is reset by the H level output of AND18.

A data input terminal of counter 11 is connected to terminal X. A pulse train representing the amount of rotation of the first guide roller 2 is applied to the terminal X by the configuration shown in FIG. In FIG. 2, 20 is a balsa, and 21 is a photointerrupter. The pulser 20 has a plurality of pores formed through it at predetermined angular intervals, and is configured to rotate together with the first guide roller 2. The photointerrupter 21 is arranged at a constant angle of M, and generates a light pulse every time the hole of the pulser 20 passes. This optical pulse is converted into a t:'A sending pulse via the photoelectric converter 22 and the waveform shaping circuit 23, and then applied to the terminal X. In this example, feeding one frame of film 5 corresponds to eight feeding pulses. Further, when the film 5 is bent by the first guide roller 2, the bent portion corresponds to four feed pulses, and the bent portion corresponds to 12 feeding pulses including the screen. When the movement corresponding to the sending pulse of 2 is applied, the object is outside the photographing screen 5a.

When the counter 11 in FIG. 1 counts 8 sending pulses, the D terminal is rlJ (H level), C
, B and A terminals are rOJ (L level), and when 12 sending pulses are counted, the D and C terminals are "work" and the B and A terminals are rQJ.

The Q output terminal of the flip-flop 13 whose reset terminal is connected to the output terminal of the AND 18 via the differentiating circuit 19 is connected to the base of the transistor 24 and connected to the flip-flop via the inverter 25 and the differentiating circuit 26. 15 reset terminal. The collector of the transistor 24 is connected to the power supply line via the coil 27a of the relay 27, and its emitter is grounded. The contact 27b of the relay 27 has a common contact connected to one current-carrying end of the film winding motor 28, and two selection contacts a and b. Contact a is connected to the power supply line, and the other contact a is grounded. In such a relay 27, the contact point A is selected when the coil 27a is de-energized, and the contact point A is selected when the coil 27a is energized. The other current-carrying end of the film winding motor 28 is grounded. The motor 28 rotates the take-up spool 4 shown in FIG.

With the above configuration, the winding signal 7 is input to the winding signal input terminal 6.
is input, and if the winding signal 7 is within a predetermined time, the timer circuit 9 continues to output an H level, and the Q output of the flip-flop 15 remains at an L level.

The counter 11 is reset by the input of the winding signal 7, and a set input is given to the flip-flop 13. As a result, the Q output of the flip-flop 13 changes to H level, and the transistor 24 becomes conductive. The relay coil 27a is excited by this conduction, and the relay contact 27b is
The film winding motor 28 is driven to start winding the film. As the pulsar 20 rotates as the film winds, the photo interrupter 21,
A sending pulse is applied to the counter 11 via a photoelectric converter 22 and a waveform shaping circuit 23. Counter 11 is 8
By counting the sending pulses, the D terminal becomes H level and the C terminal becomes L level. By this, AND1
Both inputs of 8 become H level, and a reset input is given to the flip-flop 13 via the differentiating circuit 19. Therefore, the Q output of the flip-flop 13 is inverted to the L level, so the transistor 24 is turned off, the relay contact 27b is switched to the b side, and the drive of the film winding motor 28 is stopped.

If the winding signal 7 is not input for a predetermined period of time or more, the output of the timer circuit 9 is inverted to the L level after the predetermined period of time has elapsed. As a result, a set input is given to the flip-flop 15, and its Q output is inverted to H level.

When the winding signal 7 is input while the Q output of the flip-flop 15 is at H level, the counter 11 counts 8 sending pulses, and the D terminal becomes H level and the C terminal becomes L level. Also, since the output of Ex-OR 16 becomes H level, the output of AND 18 becomes L level, and no reset manual power is applied to flip-flop 13. Therefore,
The film winding motor 28 continues to be driven. counter 1
1 counts 12 sending pulses, the D terminal and C
Both terminals become H level. As a result, the output of AND18 becomes H level, a reset input is given to flip-flop 13, and its Q output becomes L level. As the Q output of flip-flop l3 becomes L level,
At the same time as the drive of the motor 28 is stopped, the reset manual power is applied to the flip-flop 15, and the Q output of the flip-flop 15 becomes L level. As a result, the film 5 is wound an extra amount L by the amount of four feed pulses, so that the bent part of the film 5 caused by leaving the film unwinded for a predetermined period of time or more is sent out of the photographing screen 5a. It will be.

[Effects of the Invention] As explained above, according to the present invention, when the film is left for a long time without being advanced after shooting, the film winding machine can be changed and the curved portion of the film can be adjusted to the shooting screen. Since the film is transferred outside, the curved portion will not enter the photographic screen, and it is possible to prevent the image quality from deteriorating due to the film's curve.

[Brief explanation of drawings]

FIGS. 1 and 2 are configuration diagrams showing embodiments of the present invention.

Claims (1)

[Claims] A device installed in a camera that has a film transport path in which the transported film is bent by a guide member, and a film winding means for winding the film through this transport path, and the device is installed in a camera and has a film winding means for winding the film through the transport path, and the device is installed in a camera for a predetermined period of time after the next photograph is taken. and means for controlling the film winding means so that the portion of the film that was in contact with the guide member is outside the photographic screen upon this detection. Upper control device.