Optical scanner and image forming apparatus using the same

Details Optical scanner and image forming apparatus using the same Optical scanner and image forming apparatus using the same

2006-08-01

2006-08-01

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S207110, C347S244000, C347S259000

Reexamination Certificate

active

07085031

ABSTRACT:
An optical scanner includes a light source (1) that emits a light beam, a light deflector (6), an incident optical system (5) that allows the light beam to impinge on the light deflector such that the width of the light beam in the main scanning direction is larger than the width of each deflecting surface of the light deflector in the main scanning direction, and a focusing optical system (8) that guides the light beam deflected by the light deflector to a surface to be scanned. The incident optical system and the focusing optical system are constructed such that aberrations occurring in the two optical systems when a light beam impinges on the surface to be scanned at an off-axis image height are asymmetrical on both sides of the center of the light beam and the directions of the aberrations are opposite to each other.

REFERENCES:
patent: 5757535 (1998-05-01), Ichikawa
patent: 9-304720 (1997-11-01), None
patent: 2001-59946 (2001-03-01), None

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