Image forming apparatus having an exposure device changing...

Details Image forming apparatus having an exposure device changing... Image forming apparatus having an exposure device changing...

2005-07-12

2005-07-12

Tran, Huan (Department: 2861)

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

Reexamination Certificate

active

06917374

ABSTRACT:
An image forming apparatus using a multi-scan system is capable of forming an image at a high speed. An exposure device scans a surface of the photo conductor by light beams emitted by a plurality of light-emitting elements so as to simultaneously form a plurality of electrostatic latent images at a plurality of positions on the photo conductor, a pitch of the light beams in a sub scanning direction being smaller than a beam diameter defined by a value of an intensity of the light beam at which an intensity level of each light beam is 1/e2of an intensity level at a center thereof, the electrostatic latent image being formed also at a position where the plurality of light beams overlaps with each other. A code of a plurality of levels is produced from image data in accordance with a pattern detection matrix. A pulse with output from the pattern detection processing means is produced with reference to pulse width data which designates a pulse width of each light beam previously set in response to the code.

REFERENCES:
patent: 5294996 (1994-03-01), Sobue
patent: 5309177 (1994-05-01), Shoji et al.
patent: 6184916 (2001-02-01), Cianciosi
patent: 6198521 (2001-03-01), Oh-Ide
patent: 6233030 (2001-05-01), Oh-Ide et al.
patent: 2002-361930 (2002-12-01), None

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