Optical scanning apparatus, multi-beam optical scanning...

Details Optical scanning apparatus, multi-beam optical scanning... Optical scanning apparatus, multi-beam optical scanning...

2005-09-13

2005-09-13

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S207110, C359S216100, C347S259000

Reexamination Certificate

active

06943927

ABSTRACT:
Provided are compact, high-definition, optical scanning apparatus and multi-beam scanning apparatus capable of keeping the spot size uniform in the sub-scanning direction throughout the entire, effective scanning area on a surface to be scanned. An optical scanning apparatus has an entrance optical system11for guiding light emitted from a light source1, to a deflector5, and a scanning optical system6for focusing the light reflectively deflected by the deflector, on a surface to be scanned7. In the optical scanning apparatus, the scanning optical system has a plurality of sagittal asymmetric change surfaces in which curvatures in the sagittal direction change on an asymmetric basis in the meridional direction with respect to the optical axis of the scanning optical system.

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