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公开(公告)号：US5391865A
公开(公告)日：1995-02-21
申请号：US655231
申请日：1991-01-22
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0909 , G11B7/0916 , G11B7/1381
摘要： An optical pickup apparatus for optically reading the data stored in a flat information carrier disc in the form of tiny pits. The pickup apparatus directs a beam of light from a light source to the disc surface. The impinging beam is modulated by the data pits and reflected back to a photodetector. A novel optical grating assembly is disposed between the light source and the information disc, and includes a diffraction grating for the light beam from the source and a holographic grating for directing part of the light beam reflected by the disc to the photodetector. The diffraction and holographic gratings are formed integral with each other into the grating assembly.
摘要翻译： 一种用于以微小凹坑的形式光学读取存储在平面信息载体盘中的数据的光学拾取装置。 拾取装置将来自光源的光束引导到盘表面。 入射光束被数据坑调制并反射回到光电检测器。 一种新颖的光栅组件设置在光源和信息盘之间，并且包括用于来自光源的光束的衍射光栅和全息光栅，用于将由盘反射的光束的一部分引导到光电检测器。 衍射和全息光栅彼此成一体形成光栅组件。
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2.发明授权Optical information reading apparatus comprising a diffraction grating member having first and second portions 失效光学信息读取装置，包括具有第一和第二部分的衍射光栅部件
公开(公告)号：US5048000A
公开(公告)日：1991-09-10
申请号：US334563
申请日：1989-04-07
申请人： Shigeki Tsuji , Hikaru Nishihara
发明人： Shigeki Tsuji , Hikaru Nishihara
CPC分类号： G11B7/1381 , G11B7/0916 , G11B7/1353 , G11B7/094
摘要： An optical information reading apparatus for reading recorded information by detecting the presence or absence of pits on an optical disk using a laser beam. The laser beam converged a lens irradiates the optical disk in the form of light spots when in the in-focus state. A dividing line of a holographic grating used for detecting offset of the lens from the in-focus state and a dividing line of a photosensitive detector receiving a light diffracted by the holographic grating are adapted to as to be parallel to a radial direction of the optical disk. Therefore, when a light spot formed on the optical disk by astigmatism of the lens assumes an elliptical shape, the light spot becomes an ellipse whose long axis extends to the direction of the dividing line of the photosensitive detector, so that no error signal is generated in the in-focus state.
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公开(公告)号：US4989192A
公开(公告)日：1991-01-29
申请号：US235901
申请日：1988-08-24
摘要： An optical pickup apparatus for optically reading the data stored in a flat information carrier disc in the form of tiny pits. The pickup apparatus directs a beam of light from a light source to the disc surface. The impinging beam is modulated by the data pits and reflected back to a photodector. A novel optical grating assembly is disposed between the light source and the information disc, and includes a diffraction grating for the light beam from the source and a holographic grating for directing part of the light beam reflected by the disc to the photodetector. The diffraction and holographic gratings are formed integral with each other into the grating assembly.
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公开(公告)号：US4969715A
公开(公告)日：1990-11-13
申请号：US324687
申请日：1989-03-17
CPC分类号： G11B7/0932 , G11B7/093 , G11B7/123
摘要： A device for supporting an object lens in an optical head includes a substantially parallelepipedic link mechanism (5), a rotatable member (16) rotatable in the parallelepiped, a second hinge member (15) connecting the rotatable member (16) to the inner wall of one plate (10) of the link mechanism (15) to make it possible to rotate the rotatable member about an axis parallel to the optical axis of the object lens (1), a lens holding member (2) supported by the rotatable member (16) and holding the object lens (1), and a base (17) for substantially holding another plate (12) of the link mechanism.
摘要翻译： 用于在光学头中支撑物镜的装置包括基本上平行六面体的连杆机构（5），可旋转的平行六面体的可旋转构件（16），将可旋转构件（16）连接到内壁 的连接机构（15）的一个板（10），使得可以围绕平行于物镜（1）的光轴的轴旋转可旋转构件，透镜保持构件（2）由可旋转构件 （16）并且保持物镜（1），以及用于基本上保持连杆机构的另一个板（12）的基座（17）。
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5.发明授权Semiconductor chip detecting device for providing focusing and reproduction signals 失效用于提供聚焦和再现信号的半导体芯片检测装置
公开(公告)号：US5049733A
公开(公告)日：1991-09-17
申请号：US504672
申请日：1990-04-04
申请人： Koji Yoshifusa , Hikaru Nishihara , Taizo Yokota
发明人： Koji Yoshifusa , Hikaru Nishihara , Taizo Yokota
CPC分类号： G11B7/131 , G11B7/0903
摘要： A photo detecting device has a photoelectric converting element formed on a semiconductor chip with the photoelectric converting element being divided into first and second light receiving regions. The photo detecting device further has a signal processing circuit formed on the same semiconductor chip. The signal processing circuit includes a subtracting element for subtracting an output signal from the second light receiving region from an output signal from the first light receiving region.
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