Optical scanning apparatus and image-forming apparatus

Details Optical scanning apparatus and image-forming apparatus Optical scanning apparatus and image-forming apparatus

2008-10-10

2009-12-29

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S204100, C359S207100, C359S207300

Reexamination Certificate

active

07639412

ABSTRACT:
An optical scanning apparatus includes a light-source unit, an incident optical system for directing light beams emitted from the light-source unit to a deflecting unit, and an imaging optical system for guiding the light beams deflected from the deflecting unit to a surface to be scanned. The imaging optical system includes a toric lens whose power in the main scanning direction is different from that in the sub-scanning direction; the toric lens having the curvature centers of the meridians of a first toric surface connected to form a curved line located in a common plane Ha, and the curvature centers of the meridians of a second toric surface connected to form a curved line not located in a common plane.

REFERENCES:
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patent: 6141118 (2000-10-01), Yamawaki et al.
patent: 6232991 (2001-05-01), Appel
patent: 2004/0027446 (2004-02-01), Kato et al.

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