Light-scanning optical apparatus and image forming apparatus

Details Light-scanning optical apparatus and image forming apparatus Light-scanning optical apparatus and image forming apparatus

2005-08-09

2005-08-09

Coles, Edward (Department: 2622)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S474000, C358S481000, C250S235000, C359S205100, C347S256000

Reexamination Certificate

active

06927883

ABSTRACT:
A high definition light-scanning optical apparatus uses an oblique incidence optical system and has a simple configuration that does not exert any adverse effect on the quality of the image formed by it as the elements of the apparatus are appropriately arranged. The light-scanning optical apparatus comprises an incidence optical system adapted to cause the light beam emitted from an incident light emitting light source including a fold mirror to strike a deflection plane of an optical deflector with a predetermined angle in the sub-scanning section and a focussing optical system for focussing the light beam reflected by the deflection plane of the optical deflector on a surface to be scanned. The focussing optical system includes an fθ lens system having a spherical lens and a first cylindrical lens showing power in the main-scanning direction and a second cylindrical lens showing power in the sub-scanning direction.

REFERENCES:
patent: 4694164 (1987-09-01), Noguchi
patent: 4731623 (1988-03-01), Oda et al.
patent: 5089907 (1992-02-01), Yoshikawa et al.
patent: 5247385 (1993-09-01), Takanashi
patent: 5557446 (1996-09-01), Kato
patent: 5694236 (1997-12-01), Sekikawa
patent: 9-96773 (1997-04-01), None

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