JPH07319020A - Camera - Google Patents

Abstract

PURPOSE:To provide an improved camera which is downsized and besides has no fear of putting the drive control signal of other devices within a camera out of order by correcting the timing of occurrence of the drive signal which occurs, corresponding to the sending operation of a film. CONSTITUTION:For example, in case that a photographing film is for the second exposure, and that the picture angle is standard, a dot pulse signal is outputted once at the eight pulse of a photointerpreter 103, supposing that one rotation of the shaft of a motor 101 is equivalent to eight pulses. Moreover, in case that the number of the exposure of the photographing film is the twelfth one and that the picture angle is standard, the diameter of winding is large, so the number of counting of the output pulses of the photointerpreter which shows one rotation of the motor is made seven pulses one pulse less than that of the second exposure, and a dot pulse signal is outputted once at the seventh pulse. The quantity of revolution of the motor 101 for feeding a film is detected, and based on the detection output, the timing of occurrence of the drive signal to a date transcriber is corrected, so there is no necessity to provide a rotor for rotation of en encoder board, and downsizing and cost down can be materialized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera having means for correcting a drive control signal of another device in the camera in accordance with a rotation detection output of a film winding motor.

[0002]

2. Description of the Related Art In a conventional camera, a roller which is rotated by friction with a film is provided, and a pulse signal is generated in response to a coded pattern or slit formed on an encoder plate or a slit disk fixed to the roller. A detector such as a photo interrupter for generating a noise is provided, and the film feed amount is detected by counting the output pulse of the detector with a counter.

In the case of a camera having a date imprinting device, a signal for the date imprinting device is output in synchronization with the film feed amount detection signal.

[0004]

In the above-mentioned conventional camera, since the roller is provided, the number of parts is increased, and a space for the roller is required, which hinders downsizing of the camera. Was there. Further, if the roller and the film are slipped, the film feed amount detection signal and the actual film feed amount may be different, so that the position of the date imprinting may be shifted or the number may be shifted. .

Further, as one means for solving the problems of the conventional camera, the roller is eliminated and the encoder plate or slit disc is used for the shaft of the film feeding motor or the film winding spool. It is conceivable to fix it to a driving force transmission gear or the like. In other words, such a configuration detects the rotation angle and the number of rotations of the motor or the gear by a detector such as a photo interrupter that generates a pulse output in response to the coding pattern of the encoder plate or the slit disc or the slit. However, the detected signal is used as a signal corresponding to the film winding amount.

However, the rotation amount of the motor or the spool with respect to the predetermined winding amount of the film decreases as the winding amount of the film on the spool increases, so that the rotation amount of the detected motor or spool is detected. Therefore, the relationship between the actual film winding amount and the actual film winding amount is not always constant. Therefore, the detection signal from the detector having the above configuration is not suitable as the reference signal of the drive signal for other devices such as the date imprinting device.

An object of the present invention is to solve the above-mentioned problems in the conventional camera, to reduce the number of parts compared to the conventional camera, and to reduce the size thereof, and also to disturb the operation of other devices such as a date imprinting device. Is to provide an improved camera.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a detecting means for detecting the drive amount of a film feeding motor, and an apparatus to be operated corresponding to the film feeding operation. And a drive signal generation timing correction unit that corrects the generation timing of the drive signal based on the output of the detection unit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a camera to which the present invention is applied will be described below with reference to the drawings. In the camera shown in this embodiment, a date imprinting device will be described as an example of the other device that is driven in synchronization with the completion of film frame feeding. It goes without saying that the device to be driven is not limited to the date imprinting device and may be another device.

Further, the camera of the present embodiment described below is configured as a camera whose view angle can be changed so that the size of the shooting screen can be changed. For example, the shooting screen can be switched between a standard screen and a panoramic screen. It is configured such that it is provided with a photographing screen size (angle of view) setting operation member on the outer surface of the camera.

FIG. 4 is a schematic perspective view of a part of the power transmission system of the film winding mechanism of the camera of this embodiment. In the figure, 101 is a film feeding motor, 102 is an encoder plate fixed to the pinion shaft of the motor 101,
101a is a pinion fixed to the shaft of the motor 101,
Reference numeral 103 is a photointerrupter that generates an electric pulse signal in response to a coded pattern on the encoder plate 102, and 104 to 106 are power transmission gears for a film feeding mechanism such as a film winding spool.

FIG. 2 is a schematic diagram of the configuration of the electronic control system of the camera of this embodiment. In the figure, 1 is a microcomputer for controlling all operations of the camera (hereinafter abbreviated as microcomputer), 4 is a winding completion detecting means for detecting completion of winding one frame of film and sending a signal to the microcomputer 1, Reference numeral 5 is a publicly known date module as a date imprinting device which is driven in synchronization with the completion of winding one frame of film, and 6 is camera data (number of shots etc.) relating to the camera.
Is stored in the camera data storage means, 7 is a camera start-up means including a switch that is turned on in response to a pressing operation of a known release button provided in the camera, and 8 is a standard screen or a panorama of a shooting screen of the camera. An angle-of-view setting detection unit that detects an angle-of-view setting operation set on the screen. Further, 101 is the motor, and 103 is the photo interrupter.

A photo interrupter 10 is provided in the microcomputer 1.
Means for correcting the generation timing of the imprint timing signal for the date module 5 based on the output signal of No. 3 is provided.

FIG. 3 is a flow chart of the sequence control operation performed in the microcomputer 1. When the microcomputer 1 operates according to this flow chart, the devices of the respective parts in the camera operate.

FIG. 1 is a time chart showing the film winding start timing, the output pulse of the photo interrupter 103, and the dot pulse generated from the microcomputer 1 for the date module 5.

The operation of the camera will be described below with reference to FIGS. 1 and 3.

When the camera user presses a known release button in # 1 of FIG. 3, a release switch (release SW) not shown is turned on (a signal is input from the camera starting means 7 of FIG. 2 to the microcomputer 1), The microcomputer 1 proceeds to the sequence # 2. When the camera user operates the view angle setting operation member (not shown) to set the photographing screen to the panoramic screen or the standard screen, a signal is input to the microcomputer 1 by the view angle detecting means 8 in FIG. Data such as the number of shots is fetched from the camera data storage means 6.

Next, the sequence proceeds to step # 3 to execute the photographing camera sequence. That is, a series of photographing operations such as photometry, distance measurement, exposure setting, focusing, exposure, etc. are performed by the devices of the respective parts in the camera.

After the end of photographing, the microcomputer 1 drives the motor 101 to execute the step # 4, and the gear 1
A film feeding mechanism (not shown) is driven via 04 to 106 to wind the film. At this time, since the encoder plate 102 is rotated, a pulse signal is generated from the photo interrupter 103, and pulse counting is performed by a counter (not shown) in the microcomputer 1 (# 5). Then, when the predetermined number of pulses is counted (count up; # 6), the process proceeds to # 7 to output an imprint start signal to the date module 5 to imprint the date on the film.

In the case of # 5, the amount of movement of the film per one rotation of the motor 101 differs depending on the number of shots. Therefore, the correction amount for the preset number of shots (the number of shots taken from the camera data storage means 6 in # 2) is set. , The number of pulses including the correction amount of the imprinting position with respect to the preset angle of view (the angle of view captured from the angle of view detection unit 8 in # 2) is counted.

In # 7, the microcomputer 1 sends the first dot pulse to the date module 5 (dot pulse 1 in FIG. 1).
Is generated and the date is imprinted on the film. next#
8, the winding completion detecting means 4 detects the winding completion state and continues to complete winding # 10 to # 12.
Enter the loop. In pulse count 2 of # 10, pulse count for outputting the second and subsequent dot pulses is performed. The number of pulses of the predetermined pulse count-up 2 performed in # 10 is determined by the number of films and the angle of view, like the predetermined pulse count-up 1 in # 6. For example, if the second film is the photographic film and the angle of view is standard, assuming that one rotation of the shaft of the motor 101 is 8 pulses, the dot pulse signal is output once at the 8th pulse of the photo interrupter 103. . In step # 12, the image is printed on the film in the same manner as step # 7 at the timing of the dot pulse 4 in FIG. Further, when the photographic film number is 12 and the angle of view is standard, the film winding diameter on the spool increases as the film winding amount increases.
The amount of film movement per rotation of the motor increases relatively. Therefore, the count number of the output pulse of the photo interrupter representing one rotation of the motor is 1 from the second sheet.
The number of pulses is reduced to 7 and the dot pulse signal is output once at the 7th pulse. Then, the imprinting completion state is detected at the timing of dot pulse 3 in FIG. 1 (# 8).
After the completion of winding, the winding is stopped at # 9 after the completion of winding is detected.

As described above, in the camera of this embodiment, the rotation amount of the film feeding motor is detected, and the generation timing of the drive signal for the date imprinting device is corrected based on the detected output. Therefore, it is not necessary to provide a roller for rotating the encoder plate unlike the conventional camera, and it is possible to reduce the size of the camera and reduce the cost. Further, since the roller and the film do not slip, the date imprinting position does not shift.

In the above embodiment, the date imprinting device has been described as an example of the device to be operated in correspondence with the film frame feeding, but the device may be a device other than the date imprinting device. It is natural.

[0024]

According to the present invention, the camera of the present invention detects the drive amount of the film feeding motor, and generates a drive signal to another device based on the output of the detector. A drive signal generation timing correction means for correcting the timing, and an encoder plate or the like as the detection means is attached to the rotary shaft of the motor or a member driven by the rotary shaft. Therefore, according to the present invention, it is possible to provide a camera that can be downsized and cost can be reduced as compared with a conventional camera. Further, in the camera having the configuration of the present invention, since the roller is not provided, slippage between the roller and the film does not occur, and therefore, the generation timing of the drive signal with respect to the date imprinting device and the like does not occur. Operations such as date imprinting can be performed accurately, and the reliability and quality of the camera can be improved.

[Brief description of drawings]

FIG. 1 is a time chart showing a relationship between a rotation detection pulse of a film feeding motor and a dot pulse generation timing for a date imprinting device in a camera configured by applying the present invention.

FIG. 2 is a block diagram of a schematic structure of an electronic control system of the camera of one embodiment of the present invention.

FIG. 3 is a flowchart of a control operation performed by the electronic control system shown in FIG.

FIG. 4 is a perspective view showing a part of a film feed driving force transmission mechanism in the camera of one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Microcomputer 4 ... Winding completion detection means 5 ... Date module 6 ... Camera data storage means 7 ... Camera starting means 8 ... View angle setting detection means 101 ... Film feeding motor 102 ... Encoder plate 103 ... Photo interrupter (pulse detection) Means) 104 to 106 ... Gears

Claims (2)

[Claims] 1. A detection means for detecting a drive amount of a film feeding motor, and a drive for correcting a generation timing of a drive signal to an apparatus to be operated corresponding to a film feeding operation based on an output of the detection means. A camera having a signal generation timing correction means. 2. The camera of claim 1, wherein the device is a date imprinting device.