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公开(公告)号：US07672202B2
公开(公告)日：2010-03-02
申请号：US11560758
申请日：2006-11-16
申请人： Tohru Hotta , Yoshio Hayashi , Noriyoshi Ooyama , Kiyotaka Eizumi
发明人： Tohru Hotta , Yoshio Hayashi , Noriyoshi Ooyama , Kiyotaka Eizumi
IPC分类号： G11B7/00
CPC分类号： G11B7/1381 , G11B7/0903 , G11B7/1275 , G11B7/1353 , G11B2007/0006
摘要： An optical pickup apparatus comprising: a diffraction grating including a first grating for diffracting a first laser light beam, and a second grating for diffracting a second laser light beam which is shorter in wavelength than the first laser light beam, the diffraction grating being disposed in a common optical path for guiding the first laser light beam and the second laser light beam to an optical disc; and a photo detector including in a first light receiving area, a main light receiving unit, a front sub-light receiving unit, and a rear sub-light receiving unit that receive reflected light beams, which are reflected by the optical disc, of a main beam, of a front sub-beam, and of a rear sub-beam, respectively, the first laser light beam being diffracted by the diffraction grating into the main beam, the front sub-beam formed in front of the main beam, and the rear sub-beam formed at the back of the main beam, wherein the first grating is set such that the front sub-light receiving unit and the rear sub-light receiving unit in the first light receiving area are disposed at positions which substantially avoid unnecessary diffracted light beam spots which are generated by projecting to the first light receiving area unnecessary diffracted light beams, the unnecessary diffracted light beams generated by the second grating from the first laser light beam.
摘要翻译： 一种光学拾取装置，包括：衍射光栅，包括用于衍射第一激光束的第一光栅和用于衍射比第一激光束波长短的第二激光束的第二光栅，所述衍射光栅设置在 用于将第一激光束和第二激光束引导到光盘的公共光路; 以及光接收单元，其包括在第一受光区域，主光接收单元，前副光接收单元和后副光接收单元中的光检测器，其接收由光盘反射的反射光束， 主子束，前子光束和后副光束，第一激光束被衍射光栅衍射成主光束，形成在主光束前面的前子光束，以及 形成在主光束后部的后副光束，其中第一光栅被设置为使得第一光接收区域中的前子光接收单元和后副光接收单元被设置在基本避免的位置 通过向第一光接收区域投射不需要的衍射光束而产生的不必要的衍射光束点，由第二光栅从第一激光束产生的不需要的衍射光束。
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公开(公告)号：US5136565A
公开(公告)日：1992-08-04
申请号：US453933
申请日：1989-12-20
IPC分类号： G11B7/09
CPC分类号： G11B7/0933 , G11B7/0932 , G11B7/0935 , G11B7/0946
摘要： A yoke constituting a magnetic actuator for driving an objective lens has a plurality of arms arranged in a plane intersecting the optical axis of the lens perpendicular thereto. An optical system including the objective lens is disposed at one side of the yoke and has the outer peripheral portion of the lens positioned partly in the space between adjacent two arms. The lateral width of the device is decreased by an amount corresponding to the lap of the lens over the yoke. A cover plate is secured to the upper surface of the magnetic actuator in intimate contact with the upper end faces of the yoke arms to give enhanced rigidity to the device.
摘要翻译： 构成用于驱动物镜的磁致动器的轭具有布置在垂直于其的与透镜的光轴相交的平面中的多个臂。 包括物镜的光学系统设置在磁轭的一侧，并且透镜的外周部分部分位于相邻的两个臂之间的空间中。 装置的横向宽度减小相当于在轭架上的镜片搭接的量。 盖板固定在磁力驱动器的上表面上，与磁轭臂的上端面紧密接触，以提高装置的刚性。
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3.发明授权
公开(公告)号：US4767921A
公开(公告)日：1988-08-30
申请号：US68909
申请日：1987-06-30
CPC分类号： G11B7/0909 , G11B7/1365
摘要： An optical pickup device in which a laser light source is so disposed that one of two dividing lines of a photo-detector having at least four sensing portions symmetrically divided by the dividing lines so as to detect focusing deviation of a light beam onto a signal surface of a record disc, is aligned with the tangential direction of the signal track at the portion where the light beam is projected onto the signal surface, whereby the optical pickup is free from a wrong focusing control due to erroneous detection even during track jumping.
摘要翻译： 一种光拾取装置，其中激光源被设置为使得光检测器的两条划分线之一具有至少四个感测部分，该四个感测部分由分割线对称地划分，以便检测光束到信号表面的聚焦偏差 与光束投射到信号表面的部分处的信号轨道的切线方向对准，由此即使在轨道跳跃期间，由于错误的检测，光学拾取器也没有错误的聚焦控制。
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公开(公告)号：US20070127349A1
公开(公告)日：2007-06-07
申请号：US11560758
申请日：2006-11-16
申请人： Tohru Hotta , Yoshio Hayashi , Noriyoshi Ooyama , Kiyotaka Eizumi
发明人： Tohru Hotta , Yoshio Hayashi , Noriyoshi Ooyama , Kiyotaka Eizumi
IPC分类号： G11B7/00
CPC分类号： G11B7/1381 , G11B7/0903 , G11B7/1275 , G11B7/1353 , G11B2007/0006
摘要： An optical pickup apparatus comprising: a diffraction grating including a first grating for diffracting a first laser light beam, and a second grating for diffracting a second laser light beam which is shorter in wavelength than the first laser light beam, the diffraction grating being disposed in a common optical path for guiding the first laser light beam and the second laser light beam to an optical disc; and a photo detector including in a first light receiving area, a main light receiving unit, a front sub-light receiving unit, and a rear sub-light receiving unit that receive reflected light beams, which are reflected by the optical disc, of a main beam, of a front sub-beam, and of a rear sub-beam, respectively, the first laser light beam being diffracted by the diffraction grating into the main beam, the front sub-beam formed in front of the main beam, and the rear sub-beam formed at the back of the main beam, wherein the first grating is set such that the front sub-light receiving unit and the rear sub-light receiving unit in the first light receiving area are disposed at positions which substantially avoid unnecessary diffracted light beam spots which are generated by projecting to the first light receiving area unnecessary diffracted light beams, the unnecessary diffracted light beams generated by the second grating from the first laser light beam.
摘要翻译： 一种光学拾取装置，包括：衍射光栅，包括用于衍射第一激光束的第一光栅和用于衍射比第一激光束波长短的第二激光束的第二光栅，所述衍射光栅设置在 用于将第一激光束和第二激光束引导到光盘的公共光路; 以及光接收单元，其包括在第一受光区域，主光接收单元，前副光接收单元和后副光接收单元中的光检测器，其接收由光盘反射的反射光束， 主子束，前子光束和后副光束，第一激光束被衍射光栅衍射成主光束，形成在主光束前面的前子光束，以及 形成在主光束后部的后副光束，其中第一光栅被设置为使得第一光接收区域中的前子光接收单元和后副光接收单元被设置在基本避免的位置 通过向第一光接收区域投射不需要的衍射光束而产生的不必要的衍射光束点，由第二光栅从第一激光束产生的不需要的衍射光束。
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