Is a
Patent attributes
Current Assignee
0
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shigeaki Imai0
Naoki Miyatake0
Date of Patent
June 1, 2010
0Patent Application Number
108521830
Date Filed
May 25, 2004
0Patent Primary Examiner
Patent abstract
An optical scanning device has a light source, a unit configured to deflect a light beam from the light source; and a system including at least two scanning lenses and configured to guide the light beam deflected to a surface to be scanned. One of the scanning lenses closest to the deflecting unit has a positive refractive power in a main scanning direction and zero or approximately zero refractive power in a sub scanning direction, and another one of the scanning lenses closest to the surface has a negative refractive power in the main scanning direction, a positive refractive power in the sub scanning direction, and an incidence surface in the sub-scanning direction which is convex toward the deflecting unit.
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