Optical: systems and elements – Deflection using a moving element
Reexamination Certificate
2008-12-03
2009-11-17
Phan, James (Department: 2872)
Optical: systems and elements
Deflection using a moving element
C359S205100, C359S212100, C359S216100, C359S900000, C250S235000
Reexamination Certificate
active
07619795
ABSTRACT:
An optical scanning device includes a laser light source that emits a laser beam; a light deflector that deflects the laser beam; a scan-imaging optical system that focuses the laser beam deflected from the light deflector on a scanning surface to optically scan the scanning surface; a diffractive optical element receives the laser beam and diffracts a portion of the laser beam as a diffracted light; and a detecting unit that detects the diffracted light. The laser light source is a surface-emitting laser light source. Moreover, the diffractive optical element is made of plastic material having a linear expansion coefficient within a temperature variation range of the optical scanning device nearly equal to a rate of wavelength change of an emission wavelength of the laser light source within the temperature variation range.
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Dickstein & Shapiro LLP
Phan James
Ricoh & Company, Ltd.
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