Modulator for doubling resolution in the fast-scan direction for

Details Modulator for doubling resolution in the fast-scan direction for Modulator for doubling resolution in the fast-scan direction for

1997-07-17

1998-08-04

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347247, 395556, G02F 101

Patent

active

057901660

ABSTRACT:
A modulator circuit for use in driving a laser in an electrophotographic laser printer starts with a standard, inexpensive low-frequency pixel clock for timing the modulation of the laser to form an image, and effectively doubles the modulation frequency, thereby allowing spatial resolution to be doubled in the fast-scan direction. An original, low-frequency pixel clock is split, one of the split signals is delayed by a predetermined amount, and the original and delayed pixel clocks are applied to an exclusive OR gate. The modulator of the present invention functions without either a high-frequency original pixel clock or a phase-locked loop.

REFERENCES:
patent: 4807156 (1989-02-01), Parisi
patent: 5438353 (1995-08-01), Morrison
patent: 5504462 (1996-04-01), Clanciosi et al.
patent: 5517230 (1996-05-01), Lofthus et al.
patent: 5572721 (1996-11-01), Rostamian
patent: 5590316 (1996-12-01), Hausauer

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