Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2007-02-09
2008-11-11
Amari, Alessandro (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
Reexamination Certificate
active
07450284
ABSTRACT:
A compact optical scanning apparatus capable of desirably correcting an fθ characteristic, a field curvature, and other aberrations, and an image forming apparatus using the same, which includes an incident optical system (LA) for guiding a beam from a light source (1) to a deflector (4) and an imaging optical system (LB) for guiding the beam to a scanning surface (7), wherein a scanning field angle region where θ1<θ3and θ2<θ3are satisfied exists within effective scanning field angle region, where in a main scanning cross section and for a scanning field angle θ1, θ2represents an angle between a principal ray of beam incident on an optical element included in the imaging optical system and located closest to the scanning surface and an optical axis of the imaging optical system and θ3an angle between a principal ray of a beam from the optical element and the optical axis.
REFERENCES:
patent: 5233454 (1993-08-01), Sakuma et al.
patent: 5680244 (1997-10-01), Ono
patent: 5715079 (1998-02-01), Ono
patent: 08-062529 (1996-03-01), None
Tomioka Yuichi
Yamawaki Takeshi
Amari Alessandro
Canon Kabushiki Kaisha
Cowan Liebowitz & Latman P.C.
Doak Jennifer L
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