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    • 2. 发明授权
    • Optical scanning device and image forming apparatus
    • 光学扫描装置和图像形成装置
    • US08228583B2
    • 2012-07-24
    • US13117721
    • 2011-05-27
    • Taku AmadaHibiki Tatsuno
    • Taku AmadaHibiki Tatsuno
    • G02B26/08
    • G02B26/105G02B27/28G03G15/04072G03G15/0435G03G2215/0404
    • An optical scanning device includes: a light source unit that includes a light emitting unit composed of a laser light source emitting linearly polarized light inside a package member; a deflector that deflects a light beam emitted from the light emitting unit; a pre-deflector optical system arranged on an optical path between the light emitting unit and the deflector; and a scanning optical system that scans a target surface to be scanned with the light beam deflected by the deflector. The pre-deflector optical system includes at least two parallel plate optical elements each composed of a transparent medium having an incident surface and an exit surface parallel to each other. The parallel plate optical elements are arranged to be tilted in inclination that is opposite to each other in a plane of polarization of the linearly polarized light.
    • 光学扫描装置包括:光源单元,其包括由在封装构件内发射线偏振光的激光光源组成的发光单元; 偏转器,其使从所述发光单元发射的光束偏转; 布置在所述发光单元和所述偏转器之间的光路上的预偏转光学系统; 以及扫描光学系统,其用由偏转器偏转的光束扫描要扫描的目标表面。 预偏转光学系统包括至少两个平行板光学元件,每个平行板光学元件由具有彼此平行的入射表面和出射表面的透明介质构成。 平行板光学元件被布置成在线偏振光的偏振平面中彼此相对的倾斜倾斜。