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31. 发明授权

US4273998A Servo unit for optical type information reading device 失效
标题翻译：伺服单元用于光学类型信息读取装置
公开(公告)号：US4273998A
公开(公告)日：1981-06-16
申请号：US49862
申请日：1979-06-18
申请人： Hitoshi Kanamaru
发明人： Hitoshi Kanamaru
IPC分类号： G06K7/015 , G02B7/28 , G11B7/09 , G01J1/36
CPC分类号： G11B7/0903 , G11B7/0909 , G11B7/1378
摘要： A servo unit in an optical information reading device having a lens for focussing an irradiation light beam on the record surface of a disk. A movable mirror positions the focal point of the irradiation light beam formed on the track of the disk. A cylindrical lens is arranged so that the central axis of the cylinder forms a 45.degree. angle with the track direction of the disk to allow a light beam from the record surface to pass through the cylindrical lens. A focussing light receiver having four separate light receiving units is arranged on two orthogonal straight lines. The focussing light receiver receives a focus controlling light beam passed through the cylindrical lens at a distance twice as long as the focal distance of the cylindrical lens. A pair of tracking light receiving elements are provided on both sides of the focussing light receiver such that the light receiving surfaces are flush with the light receiving surface of the focussing light receiver and arranged linearly to receive a pair of tracking controlling light beams. The focal point of the irradiation light beam formed by said focussing lens is positioned on the record surface in response to an output of the focussing light receiver. The movable mirror is adjusted so that the focal point is positioned on the track in response to outputs of the pair of tracking light receiving elements and the focussing light receiver is arranged so that one of the two straight lines coincides with the central line of the cylinder of the cylindrical lens.
摘要翻译：光信息读取装置中的伺服单元，其具有用于将照射光束聚焦在盘的记录表面上的透镜。可移动镜定位形成在盘的轨道上的照射光束的焦点。圆柱形透镜被布置成使得圆筒的中心轴线与盘的轨道方向形成45度角，以允许来自记录表面的光束通过柱面透镜。具有四个分开的光接收单元的聚焦光接收器布置在两条正交的直线上。聚焦光接收器以与柱面透镜的焦距相同的距离接收通过柱面透镜的聚焦控制光束。一对跟踪光接收元件设置在聚焦光接收器的两侧，使得光接收表面与聚焦光接收器的光接收表面齐平并且线性布置以接收一对跟踪控制光束。由所述聚焦透镜形成的照射光束的焦点响应于聚焦光接收器的输出位于记录表面上。调整可移动镜，使得焦点响应于一对跟踪光接收元件的输出而位于轨道上，并且聚焦光接收器被布置成使得两条直线中的一条直线与圆柱体的中心线重合的柱面透镜。

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