基本信息:
- 专利标题： Optical scanning device and an image forming apparatus
- 申请号：JP2007038238 申请日：2007-02-19
- 公开(公告)号：JP4837596B2 公开(公告)日：2011-12-14
- 发明人： 広道 厚海 , 篤 川村 , 彰久 板橋 , 善紀 林 , 浩司 酒井 , 清三 鈴木
- 申请人： 株式会社リコー
- 专利权人： 株式会社リコー
- 当前专利权人： 株式会社リコー
- 优先权： JP2001287766 2001-09-20; JP2007038238 2007-02-19
- 主分类号： G02B26/10
- IPC分类号： G02B26/10 ; B41J2/44 ; H04N1/113
摘要：
PROBLEM TO BE SOLVED: To provide an optical scanner that can reduce changes of beam diameter due to a temperature change and a pitch deflection of a vertical scanning beam pitch of multi-beam. SOLUTION: The optical scanner includes: a first optical system 21 having a coupling lens 2 which couples a light flux from a light source 1; a second optical system 22 which is formed of a lens 3 having a positive power in a vertical scanning direction and forms the light flux into a line image extending in the horizontal scanning direction on a deflector 4; and a third optical system 23 which condenses the light flux deflected with the deflector 4 on a surface to be scanned 9a as an optical beam spot and includes a first scanning lens 5 having a positive power in the horizontal scanning direction, and a second scanning lens 6 having a positive power in the vertical scanning direction. Lateral magnification ¾βm¾ in the horizontal scanning direction of the whole optical system is set larger than the lateral magnification ¾βs¾ in the vertical scanning direction. Ribs 20A and 20B satisfies the condition of: "temperature T1 near the first scanning lens 5" > "temperature T2 near the second scanning lens 6". COPYRIGHT: (C)2007,JPO&INPIT
公开/授权文献:
- JP2007193349A Optical scanner and image formation apparatus 公开/授权日：2007-08-02