Optical beam scanning device and image forming apparatus...

Details Optical beam scanning device and image forming apparatus... Optical beam scanning device and image forming apparatus...

2005-08-04

2008-10-28

Meier, Stephen D (Department: 2853)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S258000

Reexamination Certificate

active

07443415

ABSTRACT:
An optical beam scanning device includes a light deflecting device with at least a polygon mirror portion of which is covered by a cover having a cover window portion for keeping a passage for an entering/emitting light, a pre-deflection optical system for entering an optical beam from a light source into said light deflecting device and a post-deflection optical system for focusing a reflection light from said light deflecting device on a surface to be scanned. The light deflecting device, post-deflection optical system and the cover window portion are so disposed that the pretreated light-shielding reflection light from the cover window portion avoids from striking upon a flange portion and an edge portion of one or a plurality of the optical element parts within the post-deflection optical system, with respect the entering light.

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patent: 6400488 (2002-06-01), Nagasaka et al.
patent: 6501586 (2002-12-01), Takayama
patent: 2004/0001136 (2004-01-01), Suzuki et al.
patent: 09-274134 (1997-10-01), None
patent: 10-148781 (1998-06-01), None
patent: 2001318335 (2001-11-01), None

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