Scanning optical device and image forming apparatus using...

Details Scanning optical device and image forming apparatus using... Scanning optical device and image forming apparatus using...

2005-04-19

2005-04-19

Nguyen, Henry Hung (Department: 2851)

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

C355S060000, C353S031000

Reexamination Certificate

active

06882404

ABSTRACT:
An incident optical system introduces a plurality of laser beams to an optical deflector from within a scanning range, the width of the plurality of laser beams being larger than the width of a deflection surface of the optical deflector in a main scanning direction. Principal rays of the plurality of laser beams, separated by a predetermined angle, cross each other near the deflection surface in a main scanning cross-section. A scanning optical device satisfies the expression Δθ<(4π/N)×(1−ρ), where Δθ represents the largest angle between principal rays of two of the plurality of laser beams, N represents the number of deflection surfaces of the optical deflector, and ρ represents the scanning efficiency of the deflection surface, which is the ratio of an image forming range to the theoretical maximum scanning width on the deflection surface of the optical deflector.

REFERENCES:
patent: 5929979 (1999-07-01), Okino et al.
patent: 6201561 (2001-03-01), Ichikawa
patent: 6511184 (2003-01-01), Yamagishi et al.
patent: 6512623 (2003-01-01), Ishihara
patent: 11-352426 (1999-12-01), None

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