Invention Grant
- Patent Title: Optical scanning device and image forming apparatus
- Patent Title (中): 光学扫描装置和图像形成装置
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Application No.: US12189430Application Date: 2008-08-11
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Publication No.: US08213067B2Publication Date: 2012-07-03
- Inventor: Kenichiroh Saisho
- Applicant: Kenichiroh Saisho
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Limited
- Current Assignee: Ricoh Company, Limited
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2007-219206 20070827
- Main IPC: G02B26/08
- IPC: G02B26/08

Abstract:
A temperature of a scanning optical system is different from a temperature of a light source when an optical scanning device is in operation, and when the both temperatures are assumed to be equal, a diffractive surface of a diffractive optical element is set according to a magnitude relationship between both temperatures when the optical scanning device is in operation such that a deviation amount of an in-focus position of the light flux by the diffractive optical element becomes larger or smaller than a deviation amount for canceling a deviation amount of an in-focus position of the light flux by the scanning optical system.
Public/Granted literature
- US20090059337A1 OPTICAL SCANNING DEVICE AND IMAGE FORMING APPARATUS Public/Granted day:2009-03-05
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