Optical scanning system and image forming apparatus using...

Details Optical scanning system and image forming apparatus using... Optical scanning system and image forming apparatus using...

2007-12-04

2007-12-04

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C347S259000

Reexamination Certificate

active

11617081

ABSTRACT:
An optical scanning system and an image forming apparatus with such optical scanning system, include a light source, an optical deflector having a deflecting surface, for scanningly deflecting a light beam emitted from the light source means, and an imaging optical system for imaging the light beam, deflected by the deflecting surface of the optical deflector, upon a scan surface to be scanned, wherein, when γ (γ≠0) refers to an angle which is defined, in a sub-scan sectional plane, between a principal ray of the light beam from the light source means and a normal to the deflecting surface of the optical deflector as the light beam is going to be incident on the deflecting surface, β refers to an imaging magnification of the imaging optical system with respect to a sub-scan direction, W [mm] refers to a light-beam width, in a main-scan direction, of a light beam that passes a light exit surface of an imaging optical element, of the imaging optical system, which element is closest to the scan surface, and ε (ε≠γ) refers to an angle defined, in the sub-scan sectional plane, between an optical axis of the imaging optical system and a straight line that connects a point of deflection of the light beam incident on the deflecting surface of the optical deflector and an imaging point of the light beam being imaged on the scan surface, a relation1+ββ×tan⁡(γ-ɛ)×W≤0.15⁢[mm]is satisfied.

REFERENCES:
patent: 5694236 (1997-12-01), Sekikawa
patent: 6803942 (2004-10-01), Sato et al.
patent: 7034859 (2006-04-01), Ishihara et al.
patent: 2006/0091306 (2006-05-01), Yoshida et al.
patent: 2002-365574 (2002-12-01), None
patent: 2004-070108 (2004-03-01), None

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