Scanning optical system, optical scanning apparatus and...

Details Scanning optical system, optical scanning apparatus and... Scanning optical system, optical scanning apparatus and...

2011-03-15

2011-03-15

Allen, Stephone B (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

07907318

ABSTRACT:
A scanning optical system includes: a light source for emitting a light flux with a wavelength λ; a polygon mirror comprising a plurality of reflection surfaces for deflecting the light flux emitted from the light source for scanning the scanning surface; a light-converging lens group in a two-element structure. The light-converging lens group is arranged between the polygon mirror and the scanning surface and forms a light spot on the scanning surface. In the scanning optical system, the wavelength λ is not larger than 600 nm, and the scanning optical system satisfies a conditional expression relating to a number of the reflection surfaces of the polygon mirror, a scanning width of the scanning optical system, and a focal length of the light-converging lens group in a main scanning direction.

REFERENCES:
patent: 2006/0203318 (2006-09-01), Yamawaki
patent: 2004-294887 (2004-10-01), None
patent: 2006-337916 (2006-12-01), None

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