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

2007-11-20

2007-11-20

Lee, John R. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S236000, C347S241000, C359S204200

Reexamination Certificate

active

11049973

ABSTRACT:
It is an object of the present invention to provide an optical beam scanning device and an image forming apparatus which suppress displacement of plural images formed by a different photoconductor in a sub-scanning direction by means of a simple structure even if temperature changes. The optical beam scanning device of the present invention has a single light deflecting device, a pre-deflection optical system that allows light beams from a plurality of light sources to enter the light deflecting device, and a post-deflection optical system including a first optical element for imaging reflected light beams from the light deflecting device on surfaces to be scanned for respective light beams. A second optical element, which has a positive or negative power opposite to a power of the first optical element in a sub-scanning direction, is provided in a position of the pre-deflection optical system where the light beams passes commonly and the light beams enter with distance in the sub-scanning direction.

REFERENCES:
patent: 5751462 (1998-05-01), Shiraishi et al.
patent: 5774249 (1998-06-01), Shiraishi et al.
patent: 5963354 (1999-10-01), Shiraishi et al.
patent: 5995268 (1999-11-01), Shiraishi et al.
patent: 6055084 (2000-04-01), Shiraishi et al.
patent: 6061162 (2000-05-01), Shiraishi et al.
patent: 6084699 (2000-07-01), Shiraishi et al.
patent: 6104519 (2000-08-01), Shiraishi et al.
patent: 6125994 (2000-10-01), Todome
patent: 6201625 (2001-03-01), Shiraishi et al.
patent: 6219167 (2001-04-01), Shiraishi et al.
patent: 6337757 (2002-01-01), Shiraishi et al.
patent: 6347003 (2002-02-01), Shiraishi et al.
patent: 6392772 (2002-05-01), Hama et al.
patent: 6392773 (2002-05-01), Hama et al.
patent: 6452709 (2002-09-01), Shiraishi et al.
patent: 6683708 (2004-01-01), Shiraishi et al.
patent: 6778202 (2004-08-01), Shiraishi et al.
patent: 6791729 (2004-09-01), Atsuumi et al.
patent: 6903856 (2005-06-01), Hayashi
patent: 6965466 (2005-11-01), Ishihara
patent: 6977762 (2005-12-01), Hayashi
patent: 7002759 (2006-02-01), Hama et al.
patent: 2002/0196514 (2002-12-01), Atsuumi et al.
patent: 2004/0223048 (2004-11-01), Shiraishi et al.
patent: 2005/0024479 (2005-02-01), Itabashi et al.
patent: 2005/0173625 (2005-08-01), Shiraishi
patent: 2006/0232660 (2006-10-01), Nakajima et al.
patent: 2007/0030550 (2007-02-01), Shiraishi
patent: 2001-201705 (2001-07-01), None
T. Shiraishi, U.S. PTO Office Action, Serial No. 11/727,091, Jul. 5, 2007, 7 pages.

Affiliated with

Also associated with

Rating

Optical beam scanning device and image forming apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical beam scanning device and image forming apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical beam scanning device and image forming apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3816653