Optical image forming device having a plurality of drawing beams

Details Optical image forming device having a plurality of drawing beams Optical image forming device having a plurality of drawing beams

Filed on

1996-07-22

Date issued

1998-12-01

Examiner

Le, N.

Patent Class

Incremental printing of symbolic information

SubClass

Light or beam marking apparatus or processes

SubSubClass

Scan of light

Other Related Categories

347241, 347232, B41J 247, B41J 2435, G01D 1514, G02F 111

Type

Patent

Status

active

Patent number

058445927

Description

ABSTRACT:
An optical image forming device includes a scanning lens for scanning, in a main scanning direction, eight drawing beams on an image plane. A monitoring beam is scanned repeatedly and simultaneously with the drawing beams in a predetermined scanning range. The eight drawing beams are scanned such that drawing beams adjacent each other in a sub-scanning direction pass a same position in the scanning range on the image plane at a different time. The monitoring beam is scanned prior to scanning of the drawing beam. A scale clock generator is provided for generating scale clock signals identifying positions of the monitoring beam in the scanning range. A modulator modulates the eight drawing beams such that modulations for each of the drawing beams at a same position in the scanning range are synchronized with a timing of a same scale clock signal obtained by the scale clock generator.

REFERENCES:
patent: 4796038 (1989-01-01), Allen et al.
patent: 4797696 (1989-01-01), Allen et al.
patent: 5001341 (1991-03-01), Negishi
patent: 5015846 (1991-05-01), Okayama et al.
patent: 5087813 (1992-02-01), Negishi
patent: 5140342 (1992-08-01), Metildi et al.
patent: 5194981 (1993-03-01), Morimoto

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