Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2007-01-23
2007-01-23
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C347S134000
Reexamination Certificate
active
11056285
ABSTRACT:
An optical scanning apparatus can satisfactorily correct a field curvature caused by spherical aberration in an incidence optical system. A light beam emitted from a light source is guided to an optical deflector for deflecting the light beam through a first optical system having a collimating operation, and a second optical system including a surface having a beam expanding operation and an aspherical operation for compensating for aberration in order. When the light beam deflected by the optical deflector is guided to a surface to be scanned through a third optical system, the light beam emitted from the light source is converted into a nearly collimated light beam through the first and second optical systems within a main scanning cross-section and is made incident on a deflecting surface of the optical deflector to make its width wider than that of the deflecting surface thereof in a main scanning direction. Thus, a surface of the second optical system having an aspherical operation compensates for a spherical aberration generated in the first optical system.
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Cherry Euncha P.
Fitzpatrick ,Cella, Harper & Scinto
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