Optical scanning apparatus

Details Optical scanning apparatus Optical scanning apparatus

2006-01-17

2006-01-17

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S204200, C359S207110, C347S232000, C347S244000, C347S259000

Reexamination Certificate

active

06987594

ABSTRACT:
Provided is an optical scanning apparatus for optically scanning a surface to be scanned, including: a light source unit that emits a beam modulated according to an image signal; a condenser lens for temporarily focusing the beam emitted from the light source unit into an image in a sub-scanning section in the vicinity of a deflection surface of a light deflector; and a scanning optical system for guiding the beam deflected by the light deflector onto the surface to be scanned, in which: in the sub-scanning section, the beam from the condenser lens is incident at an angle with a normal to the deflection surface; and an scanning optical element constituting the scanning optical system has an optical axis eccentric toward a deflection point side of the deflection surface with respect to a transmission position of a principle ray of the beam in a sub scanning direction.

REFERENCES:
patent: 6459520 (2002-10-01), Takayama
patent: 6501586 (2002-12-01), Takayama
patent: 6504558 (2003-01-01), Takayama
patent: 6519070 (2003-02-01), Takayama
patent: 6643044 (2003-11-01), Iizuka
patent: 2003/0025784 (2003-02-01), Sato et al.

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