Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1996-01-05
1997-11-25
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347237, 395111, 395117, B41J 247
Patent
active
056917597
ABSTRACT:
A laser printer produces a raster image of plural scan lines of image pixels, each raster scan line separated from an adjacent raster scan line by a pitch distance p. The printer includes a movable photoreceptor and n laser sources, where n.ltoreq.2. The laser sources produce n optical beams, separated by a distance of (n+1)p in a direction of movement of the photoreceptor. A scanner scans the n optical beams in parallel paths across the photoreceptor as they are modulated in accordance with pixel data provided from an image buffer. Control circuitry modulates the n optical beams, respectively, with pixel values from one set of n raster scan lines. The n raster scan lines of the set are separated from each other by a distance of (n+1)p. At the completion of each scan, the photoreceptor is moved by a distance (n.times.p). The n optical beams are again modulated with pixel values from another set of n raster scan lines that are respectively, (n+1)p distant from the n raster scan lines of the first set. In such manner, an interleaving of the scan lines is achieved, using plural optical beams from a laser diode chip to produce the n laser beams.
REFERENCES:
patent: 4905025 (1990-02-01), Sakamoto et al.
patent: 5430472 (1995-07-01), Curry
Hewlett--Packard Company
Reinhart Mark J.
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