Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1992-07-31
1995-02-21
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
358298, 341131, B41J 2435
Patent
active
053920600
ABSTRACT:
A laser recording recording apparatus including a semiconductor laser as a light source and enabling half-tone recording. The apparatus includes a recording medium moving in a sub-scanning direction, M semiconductor lasers arranged along the sub-scanning direction at a slight distance to one another and enabled to be independently modulated according to image signals, where M is an integral number of at least two, a deflector for deflecting M laser beams emitted from the M semiconductor lasers toward the recording medium and for scanning the beams in a main scanning direction, and an image forming optical system for imaging the deflected laser beams at a predetermined distance between one another along the sub-scanning direction. An exposure pattern on the recording medium is represented by a pixel matrix comprising N.times.L micro pixels, where N is the number of micro pixels with respect to said main scanning direction and L is the number of micro pixels with respect to the sub-scanning direction, and the exposure pattern is varied according to a density information included in the image signal thereby to record half-tone, where L is an integral number of times M.
REFERENCES:
patent: 4566042 (1986-01-01), Cahill
patent: 4958233 (1990-09-01), Okino
patent: 5283658 (1994-02-01), Hayashi et al.
Reinhart Mark J.
Ricoh & Company, Ltd.
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