Optical beam scanning device

Details Optical beam scanning device Optical beam scanning device

2005-12-27

2005-12-27

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S206100

Reexamination Certificate

active

06980342

ABSTRACT:
An optical beam scanning device21includes a pre-deflection optical system40for adjusting a laser beam L emitted from a semiconductor laser element41so as to be focused as a line image longitudinally extending in a direction corresponding to a main scanning direction, a polygon mirror50for scanning a photosensitive drum23with the laser beam L, and an imaging optical system60for focusing the laser beam L scanned by the polygon mirror50on the photosensitive drum23. The imaging optical system60includes one or a plurality of lenses, and is formed so as to satisfy Lc/Le≧2.2, where a light passage distance through the inside of the lens when scanning the center of an image region is denoted as Lc and a light passage distance through the inside of the lens when scanning the end of the image region is denoted as Le. The imaging optical system60may include a plastic lens composed of one lens or a plastic lens along with a glass lens.

REFERENCES:
patent: 6667757 (2003-12-01), Yamaguchi et al.
patent: 2004/0190099 (2004-09-01), Yamaguchi
patent: 2002-328323 (2002-11-01), None
U.S. Appl. No. 10/424,834, filed Apr. 29, 2003, Yamaguchi.
U.S. Appl. No. 10/879,999, filed Jun. 30, 2004, Yamaguchi.

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