Scanning optical system
    71.
    发明授权
    Scanning optical system 有权
    扫描光学系统

    公开(公告)号:US06222661B1

    公开(公告)日:2001-04-24

    申请号:US09484445

    申请日:2000-01-18

    IPC分类号: G02B2608

    摘要: A scanning optical system is provided with a semiconductor laser, a polygonal mirror, which deflects a beam emitted from the semiconductor laser, an f&thgr; lens for converging the beam deflected by the deflector onto a surface to be scanned, and a diffractive surface between the polygonal mirror and the surface to be scanned. The diffractive surface compensates for a lateral chromatic aberration caused by the f&thgr; lens. Further, the diffraction efficiency of the diffractive surface on an optical axis of the f&thgr; lens is smaller than that of a peripheral portion to cancel a power variation due to a variation of the light quantity transmitted through the scanning lens.

    摘要翻译: 扫描光学系统设置有半导体激光器,多角镜,其偏转从半导体激光器发射的光束,用于会聚由偏转器偏转的光束到待扫描的表面上的光束透镜,以及多边形之间的衍射面 镜子和待扫描的表面。 衍射面弥补了由透镜引起的横向色差。 此外,衍射面在透镜的光轴上的衍射效率小于外围部分的衍射面的衍射效率,以消除透过扫描透镜的光量的变化引起的功率变化。

    Rotational angle detector
    74.
    发明授权
    Rotational angle detector 有权
    旋转角度检测器

    公开(公告)号:US08390277B2

    公开(公告)日:2013-03-05

    申请号:US12908591

    申请日:2010-10-20

    申请人: Shuichi Takeuchi

    发明人: Shuichi Takeuchi

    IPC分类号: G01B7/30

    CPC分类号: H02K29/12 G01D5/2458

    摘要: A rotational angle detector provided with a circular rotary plate integrally rotatable with a rotor of a motor and including a circumferential surface having marks, which are spaced apart by different angular intervals in a circumferential direction. A rotational angle detection unit is arranged along the circumferential direction of the rotary plate to detect a rotational angle of each mark, rotated together with the rotary plate, in a predetermined detection zone. The rotational angle detector determines, when adjacent marks are located in the detection zone, angular intervals between the adjacent marks based on the rotational angle of each mark, specifies a mark that is located in the detection zone based on the determined angular intervals, and detects the rotational angle of the rotor based on the rotational angle of the specified mark rotating in the detection zone.

    摘要翻译: 一种旋转角度检测器,其设置有与电动机的转子一体地旋转的圆形旋转板,并且包括具有沿圆周方向以不同角度间隔间隔的标记的圆周表面。 旋转角度检测单元沿着旋转板的圆周方向布置,以检测与旋转板一起旋转的每个标记的旋转角度在预定检测区域中。 当相邻标记位于检测区域中时,旋转角度检测器基于每个标记的旋转角度确定相邻标记之间的角度间隔,基于确定的角度间隔指定位于检测区域中的标记,并且检测 基于在检测区域中旋转的指定标记的旋转角度的转子的旋转角度。

    Objective lens for optical pick-up
    75.
    发明授权
    Objective lens for optical pick-up 有权
    物镜用于光学拾取

    公开(公告)号:US08223442B2

    公开(公告)日:2012-07-17

    申请号:US12021516

    申请日:2008-01-29

    IPC分类号: G02B13/18 G02B3/02

    CPC分类号: G11B7/13922 G11B7/1374

    摘要: There is provided an objective lens for an optical pick-up. The objective lens is formed to be a single-element plastic lens having a first surface and a second surface. The first surface is configured to have, within an effective diameter, an inflection point at which a second derivative of a sag of the first surface takes a value of 0. Further, the objective lens having a numerical aperture larger than or equal to 0.75.

    摘要翻译: 提供了用于光学拾取器的物镜。 物镜形成为具有第一表面和第二表面的单元塑料透镜。 第一表面被配置为在有效直径内具有第一表面的下垂的二次导数取值为0的拐点。此外,具有大于或等于0.75的数值孔径的物镜。