Laser scanning device

Details Laser scanning device Laser scanning device

2008-03-18

2008-03-18

Allen, Stephone B. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S206100, C359S207110

Reexamination Certificate

active

11019733

ABSTRACT:
Laser light, emitted from a laser light source, is formed into a converged light ray by a condensing lens, and deflected by a resonance mirror. The laser light is converged on a photosensitive member through a scanning lens including one negative lens, and has at least one nonaxisymmetric face that provides the same power in the vicinity of the light axis in both of a main scanning direction and a sub-scanning direction. Even when a deflection angle in the resonance mirror is small, it is possible to shorten a distance from the resonance mirror to the photosensitive member, which is required for providing a desired scanning width and to effectively carry out image-face curvature correction and groove-shaped aberration correction within a sub-scanning cross section and to reduce the size of a unit including the resonance mirror and the scanning lens.

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