Method and structure for modulation in a laser printer

Details Method and structure for modulation in a laser printer Method and structure for modulation in a laser printer

1994-09-15

2000-02-01

Barlow, John

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347255, 347251, B41J 247, B41J 2435, G02B 2602, G03B 2772

Patent

active

060209089

ABSTRACT:
A method and structure for a printing system for a laser printer is provided including a data storage area containing a plurality of separate waveform signals. A controller selects a particular waveform signal to modulate the signal input to the system laser diode switch element to generate a halftone cell or a resolution enhancing cell with desired gray scale pixels. The digital laser signal from the printer controller is passed through a digital-to-analog converter circuit to a comparator circuit. The particular waveform selected from the data storage area is also applied to the comparator circuit to modulate the output signal from the digital-to-analog converter. The analog modulated signal from the comparator circuit has an analog value that maintains the laser diode switch element "on" to provide sub-pixels for the particular pixel gray level that is desired.

REFERENCES:
patent: 4814886 (1989-03-01), Kuge et al.
patent: 5017944 (1991-05-01), Kitamura et al.
patent: 5029227 (1991-07-01), Kawamura
patent: 5432611 (1995-07-01), Haneda et al.
patent: 5467422 (1995-11-01), Itihara et al.
patent: 5486927 (1996-01-01), Koizumi et al.

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