Circuit for driving an LED print head of an electro-photography

Details Circuit for driving an LED print head of an electro-photography Circuit for driving an LED print head of an electro-photography

1993-02-25

1997-08-12

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347240, 358298, B41J 247, B41J 2435, H04N 123

Patent

active

056570708

ABSTRACT:
A circuit for driving an LED print head so as to be capable of printing a variety of gray levels, comprises a print controller for generating synchronizing signals and latch clock pulses to be applied to the LED print head, a video clock signal generator means for generating a predetermined number of video clock pulses in response to the sub-synchronizing signals, a video data generating means operated by the sub-synchronizing signals for generating a number of sub-data representing the contrast of one line data in response to the video clock pulses, a contrast mode decoding means for counting the latch clock pulses in one period of the sub-synchronizing signals to generate first, second, third and fourth enable signals, a contrast strobe pulse generating means for generating first, second and third strobe pulses of different periods in response to the first enable signal, and a drive circuit for logically combining the second, third and fourth signals and the first, second and third strobe pulses so as to drive the strobe pulses representing the contrast mode of a printed image to the strobe terminal.

REFERENCES:
patent: 4074319 (1978-02-01), Goldschmidt et al.
patent: 4455578 (1984-06-01), Fearnside
patent: 4626923 (1986-12-01), Yoshida
patent: 4689694 (1987-08-01), Yoshida
patent: 4806950 (1989-02-01), Sekine et al.
patent: 4819008 (1989-04-01), Nagato et al.
patent: 4855760 (1989-08-01), Kanayama
patent: 4905027 (1990-02-01), Itoh

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