Scanning optical system
    23.
    发明授权
    Scanning optical system 失效
    扫描光学系统

    公开(公告)号:US6144477A

    公开(公告)日:2000-11-07

    申请号:US358887

    申请日:1999-07-22

    Inventor: Shuichi Takeuchi

    CPC classification number: G02B26/125 G02B13/0005 G02B7/028 G02B9/12

    Abstract: In a scanning optical system where a bundle of rays scans a surface to be scanned through an optical deflector and an image forming optical system, the image forming optical system includes a positive front lens group having two lens elements and a rear lens group constituted by an elongated single anamorphic lens element having a strong positive refractive power in the sub scanning direction. All the lens elements in the image forming optical system are made of a resin material, and the scanning optical system satisfies the conditions: (1)d.sub.0 /f

    Abstract translation: 在其中一束光线通过光学偏转器和成像光学系统扫描要扫描的表面的扫描光学系统中,图像形成光学系统包括具有两个透镜元件的正面前透镜组和由 在副扫描方向上具有强正折射力的细长单变形透镜元件。 图像形成光学系统中的所有透镜元件由树脂材料制成,并且扫描光学系统满足以下条件:(1)d0 / f <0.23(2)0.70

    Optical information recording/reproducing apparatus and objective optical system for the same
    25.
    发明授权
    Optical information recording/reproducing apparatus and objective optical system for the same 失效
    光信息记录/再现装置和物镜光学系统相同

    公开(公告)号:US08514686B2

    公开(公告)日:2013-08-20

    申请号:US13050146

    申请日:2011-03-17

    Abstract: An objective optical system for information recording/reproducing, at least one of optical surfaces of the objective optical system comprising a diffraction surface including a first region contributing to converging first, second and third beams and including a diffraction structure formed such that use diffraction orders for the first, second and third beams are 1st-orders and a condition 0.03

    Abstract translation: 一种用于信息记录/再现的物镜光学系统,所述物镜光学系统的光学表面中的至少一个包括衍射表面,所述衍射表面包括有助于会聚第一,第二和第三光束的第一区域,并且包括衍射结构, 第一,第二和第三光束为1阶,满足条件0.03 <(λB11-λ1)/λ1<0.40; 第二区域有助于仅会聚第一和第二光束,并且包括形成为使得衍射级数为1级并且条件为-0.35 <(λB12-λB11)/λ1<0.35的衍射结构; 以及第三区域,仅有助于仅会聚第一光束,并且包括形成为使得第一光束的使用衍射级为奇数阶和条件的衍射结构:-0.23

    Rotational angle detector
    28.
    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

    Inventor: Shuichi Takeuchi

    CPC classification number: H02K29/12 G01D5/2458

    Abstract: 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.

    Abstract translation: 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。

    OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND OBJECTIVE OPTICAL SYSTEM FOR THE SAME
    29.
    发明申请
    OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND OBJECTIVE OPTICAL SYSTEM FOR THE SAME 失效
    光信息记录/再现设备和目标光学系统

    公开(公告)号:US20130016598A1

    公开(公告)日:2013-01-17

    申请号:US13547342

    申请日:2012-07-12

    CPC classification number: G11B7/13922 G11B7/1367 G11B7/1374 G11B2007/0006

    Abstract: An objective optical system for an optical information recording/reproducing apparatus, at least one surface of the objective optical system being configured to be a phase shift surface having a phase shift structure, wherein: the phase shift surface has a first area contributing to converging first, second and third light beams onto recording surfaces of first, second and third optical discs, respectively; in the first area, the phase shift surface has at least two types of phase shift structures including a first phase shift structure having first steps and a second phase shift structure having second steps; the phase shift surface has a plurality of combinations of annular zones which satisfy a condition: 0.95

    Abstract translation: 一种用于光学信息记录/再现装置的物镜光学系统,所述物镜光学系统的至少一个表面被配置为具有相移结构的相移表面,其中:所述相移表面具有有助于首先收敛的第一区域 ,第二和第三光束分别连接到第一,第二和第三光盘的记录表面上; 在第一区域中,相移表面具有至少两种类型的相移结构,包括具有第一步骤的第一相移结构和具有第二步骤的第二相移结构; 相移表面具有满足以下条件的环状区域的多个组合:0.95

    Objective lens and optical information recording/reproducing device having the same
    30.
    发明授权
    Objective lens and optical information recording/reproducing device having the same 失效
    具有相同的物镜和光信息记录/再现装置

    公开(公告)号:US08279738B2

    公开(公告)日:2012-10-02

    申请号:US12330861

    申请日:2008-12-09

    CPC classification number: G11B7/13922 G11B7/0908 G11B7/1374 G11B2007/0006

    Abstract: There is provided an objective lens for information recording/reproducing for three types of optical discs, which includes a first area contributing to converging a third light beam onto a record surface of a third optical disc. The first area includes a phase shift structure having refractive surface zones concentrically formed about a predetermined axis. The phase shift structure includes first and second step groups. The first step group is configured such that an optical path length difference ΔOPD1 (nm) given by each step of the first step group to a first light beam satisfies a condition: 2N1+1.10

    Abstract translation: 提供了一种用于三种类型的光盘的信息记录/再现的物镜,其包括有助于将第三光束会聚到第三光盘的记录表面上的第一区域。 第一区域包括具有围绕预定轴线同心地形成的折射表面区域的相移结构。 相移结构包括第一和第二步骤组。 第一步骤组被配置为使得第一步骤组的每个步骤给出的第一光束的光程长度差Dgr; OPD1(nm)满足条件:2N1 + 1.10 <|&Dgr; OPD1 /λ1| <2N1 +1.40,其中N1是整数或零,并且第二步骤组被配置为使得由第二步骤组的每个步骤给予的第一光束的光程长度差Dgr; OPD2(nm)满足条件:2N2 -0.10 <|&Dgr; OPD2 /λ1| <2N2 + 0.10,其中N2是整数。

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