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Title:
OPTICAL SCANNER AND IMAGE FORMING APPARATUS
Document Type and Number:
Japanese Patent JP2008197187
Kind Code:
A
Abstract:

To provide an image forming apparatus capable of scanning stably with light rays on a surface to be scanned and forming a high-quality image, at a high speed.

A light beam Bk from a cylinder lens 204a and a light beam Bc from a cylinder lens 204b are set to enter a polygon mirror 104, each being inclined to -Z side relative to a normal line direction RH of a deflecting reflection face of the polygon mirror 104. Also, a light beam Bm from a cylinder lens 204c and a light beam By from a cylinder lens 204d are set to enter the polygon mirror 104 each inclined to +Z side relative to a normal line direction RH of the deflecting reflection face of the polygon mirror 104. In other words, light beams made incident on the -X side and the +Z side of the polygon mirror 104 are inclined opposite to each other, relative to the normal line direction of the polygon mirror 104, at least with respect to a subscanning line.


Inventors:
HIRAKAWA MAKOTO
HAYASHI YOSHIAKI
MIYATAKE NAOKI
Application Number:
JP2007029878A
Publication Date:
August 28, 2008
Filing Date:
February 09, 2007
Export Citation:
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Assignee:
RICOH KK
International Classes:
G02B26/10; B41J2/44; G02B17/08; H04N1/036; H04N1/113
Domestic Patent References:
JPH1164759A1999-03-05
JPS59188616A1984-10-26
JP2006301205A2006-11-02
JP2006198881A2006-08-03
JP2006091879A2006-04-06
JP2006350167A2006-12-28
JP2000267031A2000-09-29
JP2001004942A2001-01-12
JP2002264391A2002-09-18
JP2004230654A2004-08-19
Attorney, Agent or Firm:
Atsushi Tateishi



 
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