JPH04307529A - Data imprinting device for camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data imprinting device for a camera.

0002

[Prior Art] In a data imprinting device for a camera that imprints characters composed of dots, there is a means for exposing the film by controlling the light emission of an LED, or a means for exposing the film by transmitting light through an LCD panel. The data was imprinted using a method.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned technology, since the emitted light color of the LED is monochromatic light, when the background color of the imprinted data is similar to the emitted light color of the LED, the data is becomes difficult to read.

[0004] In addition, with the means for transmitting light to the LCD panel, white light can be used as a light source, but there is a drawback that the number of digits of data that can be imprinted is limited.

[0005]

[Means for Solving the Problems] A data imprinting device for a camera according to the present invention includes a thermal head equipped with one or more dots capable of generating heat independently for each dot, a film movement speed detection means, and a data imprinting device for a camera that is detected by the detection means. The present invention is characterized by comprising a light emission control means for controlling the heat generation interval of the thermal head according to the speed.

[0006]

EXAMPLES The present invention will be explained in detail below based on examples. FIG. 1 is a configuration diagram showing an embodiment of a data imprinting device for a camera according to the present invention. 1 is film, 2 is 7
3 is a heating element control means, S1 is an input signal linked to the release, and 4 is a rotary encoder. After the camera release is pressed and one frame has been shot, the rotary encoder 5 detects the movement of the film 1 as the film is wound up, and controls the appropriate heat generation of the thermal head 2, which is in close contact with the emulsion surface of the film 1. By doing this, characters, signals, etc. are imprinted on the film 1 while the film 1 is being moved.

FIG. 2 is a circuit diagram showing an example of the circuit of the rotary encoder 4, heat generation control means 3, and thermal head 2 shown in FIG. 23 is an LED, 5 is a phototransistor, and 5 and 23 constitute a rotary encoder. 6 is a microcomputer equipped with ROM, RAM input/output terminals, etc.; 7 and 8 are key switches for inputting data for imprinting, and inputting data such as characters, numbers, symbols, etc. to be imprinted. Set. 9～
Reference numeral 15 denotes a transistor that supplies a current necessary to generate heat in the thermal head 2, and the microcomputer 6 independently controls each transistor to generate heat. The microcomputer 6, key switches 7, 8, and transistors 9-15 constitute a light emission control means 3.

Reference numerals 16 to 26 designate thermal heads, and heat generation can be controlled independently by transistors 9 to 15, respectively. The thermal head 2 is composed of thermal heads 16 to 22.

FIG. 3 is an operation timing diagram from when the camera release button is pressed until the thermal head 2 for imprinting generates heat.

[0010] When the release button of the camera is pressed, S1 starts up in conjunction. FIG. 3(a) is a voltage waveform diagram of S2. Next, as the film 1 is wound up after the release button is pressed, a voltage waveform as shown in FIG. 3(c) is obtained at the collector of the phototransistor 5 of the rotary encoder 4. The microcomputer 6 detects the falling edge of the collector voltage waveform of the phototransistor 5 50 times so that the thermal head 2 comes to an appropriate data imprinting start position on the film 1. At the same time as the 50th falling edge of the collector voltage waveform is detected, a signal as shown in FIG. 3(d) is outputted from the microcomputer 6 in synchronization with the falling edge. The signal shown in FIG. 3(c) is transmitted through transistors 9 to
The heat generation of the thermal head 2 is controlled as a base input signal of 15.

FIG. 4 shows a flowchart from the start of the film winding operation until the thermal head 2 is controlled. The falling edges of the synchronization signal output from the rotary encoder 4 are counted by 24 counters. At 25, it is determined that the content of the counter becomes 50, and when the counter 24 reaches 50, imprinting is performed at 26. Next, the input of the synchronization signal from the encoder 4 is confirmed at 27, and after confirmation, the presence or absence of data to be imprinted next is confirmed at 28. If data is available, 26 to 2
Repeat the process up to 8.

By doing the above, data such as characters and symbols input in advance can be imprinted onto the film.

[0013]

Effects of the Invention: Since the data imprinting device for cameras of the present invention imprints data through chemical changes caused by thermal energy, it has the same R
Data can be imprinted on all GB photosensitive layers. Therefore, unless the background color is white, high data imprinting quality can be obtained without being affected by the background color. Furthermore, since dots are imprinted in synchronization with the film feeding speed, the number of digits of imprint data can be arbitrarily set within the width of the film screen.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a data imprinting device for a camera according to the present invention.

FIG. 2 is a hardware diagram showing the circuit example of FIG. 1;

FIG. 3 is a timing diagram. (a) is a waveform diagram of S1, (b)
(c) is a waveform diagram of the collector of the phototransistor 5 of the rotary encoder 4, and (c) is a waveform diagram of the base input of the transistor 9.

FIG. 4 is a flowchart diagram.

[Explanation of symbols]

1 Film 2 Thermal head 3 Heating element control means 4 Rotary encoder 5 Phototransistor 6. Microcomputer 7 Input data select switch 8 Input data set switch 9-15 Transistor 16-22 Heating element 23 LED 24 Encoder output signal count 25 Counter content determination 26 Imprint 27 Encoder output signal input judgment 28 Determine whether there is imprint data

Claims (1)

[Claims] 1. A thermal head comprising one or more dots capable of generating heat independently for each dot, a film movement speed detecting means, and a light emission interval for controlling the heat generation interval of the thermal head based on the speed detected by the detecting means. A data imprinting device for a camera, characterized by comprising a control means.