JPH03233540A - Data imprinting device for camera - Google Patents

Abstract

PURPOSE:To perform imprinting at accurate intervals of dots in accordance with the moving speed of a film by obtaining the moving speed of the film from the moving speed of the hole of perforation. CONSTITUTION:This camera is provided with a means for obtaining the moving speed of the film 5 by detecting the movement of the hole 7 of the perforation of the film 5 by a photosensor such as a reflection type photointerrupter 1 and a control means 2 for controlling the appropriate light emitting interval of a light emitting body such as an LED 3 in accordance with the moving speed. Therefore, the moving speed of the film 5 is accurately obtained and the time of the light emitting inverval of the light emitting body 3 is controlled according to the obtained moving speed. Even when the film moving speed is changed at the time of moving the film, such as winding or rewinding the film, the data is imprinted without receiving the effect of the speed change.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in data imprinting devices for cameras.

[Summary of the Invention 1 The present invention provides a dot that is arranged on the back surface of the film when viewed from the lens of a camera, perpendicular to the film feeding direction and parallel to the film surface, and capable of emitting each dot independently. By concentrating a light emitting body such as an LED having one or more dots with a lens and controlling the lighting of the light emitting body such as the LED, when the film is moved such as when the film is wound or rewound. In a data imprinting device for a camera that imprints characters, symbols, etc. onto the film, the moving speed of the perforation holes in the film is determined by a photo sensor such as a reflective type) odometer interrupter, and based on this result, LEDs, etc. The control means calculates the ideal light emission interval time of the light emitter according to the result of the calculation, and the control means calculates the ideal light emission interval time of the light emitter according to the result of the calculation. By controlling the light emitter, it is possible to imprint characters and symbols onto the film at precise dot spacing.

[Prior art 1] In a data imprinting device for a camera that imprints characters composed of dots, movement of the film is detected by a roller that is in close contact with the film and a rotary encoder placed at the opposite end of the roller. However, the LED was controlled according to this detection result.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, the roller that is in close contact with the film transmits the moving speed of the film through friction with the film, so it is affected by slipping and other factors, making it difficult to accurately There are cases where the movement speed cannot be determined.

Therefore, in order to solve these problems, the present invention detects the amount of movement of perforation holes in the film as an optical change of a photosensor such as a photointerrupter, instead of using friction, to accurately move the film. This method determines the speed and, depending on the determined result, makes it possible to imprint with accurate dot spacing.

[Means for Solving the Problems] A data imprinting device for a camera according to the present invention is arranged on the back surface of the film when viewed from the camera lens, and is perpendicular to the film feeding direction and with respect to the film surface. A light emitting body such as an LED, which is arranged in parallel and has one or more dots each of which can emit light independently, is focused by a lens, and the lighting of the light emitting body such as the LED is controlled, so that the film is In a data imprinting device for a camera that imprints characters, symbols, etc. on the film when the film is moved during winding or rewinding, the movement of the perforation holes of the film is controlled by a reflective photointerrupter or the like. The present invention is characterized by comprising means for determining the moving speed of the film by detecting it with a photosensor, and a control means for controlling an appropriate light emission interval of the light emitting body such as the LED according to the moving speed. .

[For Use] Since the present invention has the above configuration, the film movement speed is calculated from data obtained by a photosensor such as a reflective photointerrupter and a photosensor such as a reflective photointerrupter, and this calculation is performed. Depending on the result, ED
The movement speed of the film can be accurately determined by the function of the control means that controls the light emission interval time of the light emitters such as
In addition, it is possible to control the light emitting interval time of the light emitting body according to the determined movement speed, so even if the film movement speed changes during film movement such as film winding or rewinding, it will not be affected by this. , data can be imprinted.

[Examples] Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is a block diagram showing an embodiment of a data imprinting device for a camera according to the present invention. Reference numeral 1 denotes a reflective photo ink printer, 2 a control means, which controls the lighting of the LED 3 based on data obtained from the reflective photo ink printer 1, and 3 an L for imprinting data with dots.
ED, it is arranged perpendicular to the feeding direction of the film 5 and parallel to the surface of the film 5. 4 is an optical lens for projecting the light from the LED 3 onto the film 5. 5 is a camera film, 6 is a reflective plate for reflecting light from a reflective photointerrupter, and 7 is a film perforation hole. A voltage waveform as shown in FIG. 2 is obtained by the movement of the perforation holes as the film 5 is moved, such as by winding up or unwinding. FIG. 2 is a diagram of the voltage waveform appearing at the output of the reflective photointerrupter 1 while the film 5 is moving.

8 shows a waveform section when a photointerrupter is located at the position of a perforation hole, and 9 is a waveform section when a photointerrupter is located at a position on the film between one perforation hole and the next perforation hole. 1
0 is a section from perforation hole 7 to the next perforation hole, and control means 2 determines the moving speed of film 5 from the distance from perforation hole 7 to the next perforation hole and the time required for section 10.

Further, the control means 2 determines the light emission interval of the LED 3 corresponding to the moving speed, and controls the light emission of the LED 3 based on the light emission interval.

By carrying out the above operations while the film 5 is being moved, such as during winding or rewinding, it is possible to imprint the film 5 with appropriate dot spacing.

Further, the LED 3 as a light emitter and the number of dots on the light emitter are merely examples.

In addition, although FIG. 1 shows an example of detection using a reflective photoinkractor, in addition to this, a phototransistor may be placed at the position of the reflective photoinkractor 1 in FIG.
Possible methods include arranging a light emitter that can turn on the phototransistor at the position of the reflecting plate 6 and determining the moving speed from the output of the phototransistor, or using a photodiode instead of the phototransistor. The method of detecting the moving speed of the perforation hole 7 shown in FIG. 1 is merely an example.

Regarding the voltage waveform diagram in FIG. 2, the voltage and time are merely examples.

[Effects of the Invention] The camera data imprinting device of the present invention uses a reflective photointerrupter to determine the film travel speed from the perforation hole travel speed, thereby accurately determining the film travel speed. Therefore, in the case of a camera data imprinting device that imprints characters made up of dots using a light emitting device such as an LED, it is possible to imprint with accurate dot spacing depending on the film movement speed. Become.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a data imprinting device for a camera as an embodiment of the present invention. FIG. 2 is the waveform that appears at the output of the photo ink club during film movement. that's all

Claims (1)

[Claims] Located on the back of the film when viewed from the camera lens,
A light-emitting body such as an LED, which is arranged perpendicular to the film feeding direction and parallel to the film surface and has one or more dots each capable of emitting light independently, is focused by a lens. , data imprinting for a camera in which characters, symbols, etc. are imprinted on the film when the film is moved, such as when the film is wound or rewound, by controlling the lighting of the light emitting body such as the LED; In the apparatus, means for determining the moving speed of the film by detecting the movement of the perforation holes in the film with a photosensor such as a reflective photointerrupter; A data imprinting device for a camera, characterized by comprising a control means for controlling an appropriate light emission interval.