Optical scanning device, optical writing device, and image...

Details Optical scanning device, optical writing device, and image... Optical scanning device, optical writing device, and image...

2011-06-03

2011-12-13

Cherry, Euncha (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

08077369

ABSTRACT:
An optical scanning device includes a first optical system for guiding light beams emitted from a plurality of light emitting units to an optical deflector, and a second optical system for focusing the light beams to optically scan a surface to be scanned. At least one of the first optical system and the second optical system includes a resin lens having a diffractive surface. The diffractive surface includes a diffractive portion and a refractive portion. A power of the diffractive portion and a power of the refractive portion cancel each other.

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