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51. 发明授权

US4571035A Two-element f.theta. lens group capable of correcting leaning of deflecting plane 失效
标题翻译：能够修正偏转平面倾斜的双元素fθ透镜组
公开(公告)号：US4571035A
公开(公告)日：1986-02-18
申请号：US443697
申请日：1982-11-22
申请人： Nobuo Sakuma
发明人： Nobuo Sakuma
IPC分类号： G02B13/00 , G02B26/10 , G02B26/12 , G02B27/00 , G02B3/02
CPC分类号： G02B13/0005 , G02B26/125 , G02B27/0031
摘要： An f.theta. lens is provided for use in an optical scanner including a deflection unit for deflecting a beam of light at substantially uniform angular rate, first optics for causing the inciddence of a beam which is elliptical in cross section and has a principal axis substantially parallel to a deflecting plane defined by the deflection unit and adapted to be focused in a direction orthogonal to the principal axis, a surface being scanned, and second optics having an f.theta. characteristic for focusing the beam onto the surface and causing it to scan the surface substantially at uniform rate as the beam is deflected by the deflection unit. The two-element lens group includes a meniscus single lens having an f.theta. characteristic and having a positive power and having its concave surface directed toward the deflection unit. Also included is a cylindrical lens having a positive power in a plane perpendicular to the deflecting plane.
摘要翻译：提供了一种用于光学扫描仪的光学透镜，该光学扫描仪包括用于以基本均匀的角速度偏转光束的偏转单元，第一光学器件用于引起横截面为椭圆形的横梁的入射并且具有基本平行的主轴到由偏转单元限定的偏转平面，并且适于在与主轴正交的方向上被聚焦，被扫描的表面和具有用于将光束聚焦到表面上并使其扫描表面的fθ特性的第二光学元件当光束被偏转单元偏转时，基本上以均匀的速率。双元件透镜组包括具有fθ特性并具有正功率并且其凹面指向偏转单元的弯液面单透镜。还包括在垂直于偏转平面的平面中具有正功率的柱面透镜。

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