Invention Grant
US08077369B2 Optical scanning device, optical writing device, and image forming apparatus
有权
光学扫描装置，光学写入装置和图像形成装置
- Patent Title: Optical scanning device, optical writing device, and image forming apparatus
- Patent Title (中): 光学扫描装置，光学写入装置和图像形成装置
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Application No.: US13152989Application Date: 2011-06-03
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Publication No.: US08077369B2Publication Date: 2011-12-13
- Inventor: Kohji Sakai , Yoshinori Hayashi , Takeshi Ueda , Daisuke Ichii , Kenichiroh Saisho
- Applicant: Kohji Sakai , Yoshinori Hayashi , Takeshi Ueda , Daisuke Ichii , Kenichiroh Saisho
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2006-123329 20060427; JP2006-125792 20060428; JP2006-206680 20060728
- Main IPC: G02B26/08
- IPC: G02B26/08
Abstract:
An optical scanning device includes a first optical system for guiding light beams emitted from a plurality of light emitting units to an optical deflector, and a second optical system for focusing the light beams to optically scan a surface to be scanned. At least one of the first optical system and the second optical system includes a resin lens having a diffractive surface. The diffractive surface includes a diffractive portion and a refractive portion. A power of the diffractive portion and a power of the refractive portion cancel each other.
Public/Granted literature
- US20110228368A1 OPTICAL SCANNING DEVICE, OPTICAL WRITING DEVICE, AND IMAGE FORMING APPARATUS Public/Granted day:2011-09-22
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