Optical scanning device and image forming apparatus

Details Optical scanning device and image forming apparatus Optical scanning device and image forming apparatus

2008-07-17

2011-11-15

Pham, Hai C (Department: 2861)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S258000

Reexamination Certificate

active

08059149

ABSTRACT:
An optical scanning device includes a light source, a pre-deflection optical system, a polygon mirror, and a scanning optical system. The pre-deflection optical system includes a coupling lens and a diffraction lens. A light output surface of the coupling lens is a phase shifting surface, while a light output surface of the diffraction lens is a diffractive surface. The absolute value of the focal length of the diffraction lens is longer than the absolute focal length of the coupling lens.

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