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    • 23. 发明授权
    • Objective optical system for optical pick-up
    • 物镜光学拾取系统
    • US06829105B2
    • 2004-12-07
    • US10253631
    • 2002-09-25
    • Wataru Kubo
    • Wataru Kubo
    • G02B1318
    • G11B7/1374G11B11/10543
    • A single-element objective lens for an optical pick-up is configured to converge substantially parallel light rays incident thereon onto a data recording surface of an optical recording medium. The objective lens includes, a first surface, which is a light incident side surface, and a second surface, which is an optical recording medium side surface. The first surface is an aspherical surface having a positive power, and the second surface is an aspherical surface having positive or negative power. The objective lens is designed such that paraxial wavefront aberration is 0.07&lgr; rms or less when a decentering amount between the first and second surfaces is 2 &mgr;m or less so as to converge the incident light substantially to a diffraction limit. A numerical aperture of the objective lens is 0.8 or more.
    • 用于光学拾取器的单元件物镜被配置为将入射到其上的基本上平行的光线会聚到光学记录介质的数据记录表面上。 物镜包括作为光入射侧表面的第一表面和作为光记录介质侧表面的第二表面。 第一表面是具有正功率的非球面,并且第二表面是具有正或负功率的非球面。 物镜被设计成使得当第一和第二表面之间的偏心量为2μm或更小时,近轴波前像差为0.07λ或更小,以便将入射光基本上会聚到衍射极限。 物镜的数值孔径为0.8以上。
    • 24. 发明授权
    • Photomagnetic head apparatus
    • 光磁头设备
    • US5850380A
    • 1998-12-15
    • US890829
    • 1997-07-10
    • Wataru Kubo
    • Wataru Kubo
    • G11B11/10G11B7/09G11B7/13G11B7/135G11B11/105
    • G11B7/133G11B11/10543G11B7/1353G11B7/1356G11B7/1381G11B7/0912
    • A photomagnetic head apparatus includes a beam splitter which splits a laser beam, reflected by concentric recording tracks of a rotating photomagnetic recording disc, into three bundles of rays. The three bundles of rays have different polarization directions in a plane which lies in a radial direction of the recording tracks. One of the three bundles of rays is used as a servo-signal light, and the remaining two bundles of rays are used as data signal lights. A defocusing diffraction element splits at least the servo-signal light into a least two bundles of rays in a direction corresponding to the tangential direction of the recording tracks, substantially perpendicular to the split direction of the beam splitter and which provides at least two split lights with a predetermined amount of positive or negative defocus in an optical axis direction. A pair of servo-signal light receiving elements receive the split beams of the servo-signal light produced by the defocusing diffraction element. A data light receiving element receives the data signal lights. The defocusing diffraction element is made of a non-circular element whose numerical aperture in the tangential direction of the recording tracks is smaller than the numerical aperture in the radial direction.
    • 光磁头装置包括分束器,其将由旋转的光磁记录盘的同心记录轨道反射的激光束分成三束光束。 三束光线在位于记录道的径向方向的平面内具有不同的偏振方向。 三束光线之一用作伺服信号灯,其余两束光线用作数据信号灯。 散焦衍射元件至少将伺服信号光在与记录磁道的切线方向对应的方向上分成至少两束光线,该方向基本上垂直于分束器的分割方向,并且提供至少两个分光 在光轴方向上具有预定量的正或负散焦。 一对伺服信号光接收元件接收由散焦衍射元件产生的伺服信号光的分束。 数据光接收元件接收数据信号灯。 散焦衍射元件由非圆形元件制成,其记录磁道的切线方向上的数值孔径小于径向数值孔径。
    • 25. 发明授权
    • Objective lens system of an optical disk device
    • 物镜系统的光盘装置
    • US5600494A
    • 1997-02-04
    • US571514
    • 1995-12-13
    • Wataru KuboKoichi MaruyamaSuguru Takishima
    • Wataru KuboKoichi MaruyamaSuguru Takishima
    • G02B13/18G11B7/135
    • G11B7/1374G02B13/18G11B7/13922G11B2007/13727
    • An objective lens system used in an optical system of an optical disk device. The objective lens system includes at least one lens element and converges light emitted from a light source onto a reflecting layer of an optical disk. The lens element has an offense against the sine condition OSC, and the optical disk has a substrate thickness T and a refractive index n. A ray of light exits the lens element and intersects an optical axis of the lens element at an angle .alpha.. The values of OSC, .alpha., n and T satisfy the following relationship for light rays that are incident on the objective lens system at distances from the optical axis of the objective lens system which are least equal to a predetermined percentage of an effective height of an aperture of the objective lens: ##EQU1## Accordingly, a spherical aberration of the optical system is corrected. An offense against the sine condition of only the objective lens is substantially coincident with a spherical aberration of the objective lens such that a coma of only the objective lens is corrected.
    • 一种用于光盘装置的光学系统的物镜系统。 物镜系统包括至少一个透镜元件,并且将从光源发射的光会聚到光盘的反射层上。 透镜元件具有针对正弦条件OSC的挑战,并且光盘具有基板厚度T和折射率n。 光线离开透镜元件并以角度α与透镜元件的光轴相交。 OSC,α,n和T的值对于距离物镜系统的光轴入射到物镜系统的光线满足以下关系:最小等于预定百分比的有效高度 物镜的孔径:因此,校正光学系统的球面像差。 仅针对物镜的正弦状态的进攻基本上与物镜的球面像差一致,使得仅修正了物镜的彗差。