| US 7,526,145 B2 | ||
| Optical scanning device and image forming apparatus using the same | ||
| Seiichiro Mori, Tochigi (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Sep. 13, 2004, as Appl. No. 10/938,601. | ||
| Claims priority of application No. 2003-322814 (JP), filed on Sep. 16, 2003. | ||
| Prior Publication US 2005/0057636 A1, Mar. 17, 2005 | ||
| Int. Cl. G06K 9/20 (2006.01); B41J 27/00 (2006.01) | ||
| U.S. Cl. 382—317 [347/258; 358/475] | 18 Claims |
| 1. An optical scanning device, comprising:
a light source means;
an incident optical system for allowing a light beam emitted from the light source means to enter a deflection surface of
a deflection means at a predetermined angle within a sub scanning section; and
an imaging optical system including at least one imaging optical element for imaging the light team deflected by the deflection
means to a surface to be scanned,
wherein the at least one imaging optical element included in the imaging optical system comprises a plurality of regions which
have different refractive powers in a main scanning direction within a sub scanning section, the light beam from the incident
optical system passes through a region of the plurality of regions, which has a refractive power in a main scanning direction,
and the light beam deflected on the deflection surface is entered on a region of the plurality of regions, which has another
refractive power in the main scanning direction.
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