Image forming device

Details Image forming device Image forming device

1998-10-30

2000-12-19

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347232, B41J 2435, B41J 247

Patent

active

061633348

ABSTRACT:
A conventional image forming device having a plurality of image optical scanning recording sections has had a drawback of being incapable of correcting printing positions of the image optical scanning recording sections with high precision by using a small-scale circuit. In the case of an image forming device of the present invention, a variable clock generator 114 having a voltage control oscillator (VCO) 114a is provided therein as reference clock signal generating means of laser control system of each of image optical scanning recording sections (LSU) for cyan, yellow, and magenta. By so doing, during an invalid printing period prior to a valid printing period, frequencies of the reference clock signals of the LSUs for cyan, yellow, and magenta are adjusted in accordance with offsets of printing start positions of these LSUs with respect to that of the LSU for black, so that printing offsets are eliminated. As a result, the printing start positions are made to coincide with each other with high precision even with a small-scale circuit.

REFERENCES:
patent: 4903067 (1990-02-01), Murayama et al.
patent: 5115256 (1992-05-01), Miyagi et al.
patent: 5943087 (1999-08-01), Kataoka et al.
patent: 6002413 (1999-12-01), Nishizawa et al.
patent: 6003972 (1999-12-01), Narushima et al.

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