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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：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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公开(公告)号：US4998806A
公开(公告)日：1991-03-12
申请号：US458442
申请日：1989-12-28
申请人： Shigeki Tsuji , Yukio Kurata , Taizo Yokota
发明人： Shigeki Tsuji , Yukio Kurata , Taizo Yokota
CPC分类号： G02B5/1885 , G02B27/4211 , G02B27/4227 , G02B27/4272 , G02B3/0056 , H04N1/0311 , H04N1/0312 , G02B3/08 , Y02E10/52
摘要： This image reading apparatus includes a light source for illuminating an object, a lens array for focusing reflected light from the object into a predetermined position, and an image sensor for reading an image formed by the focused light. The lens array includes a transparent base and a diffraction element provided on at least an incident plane and an emission plane of the base. The lens array includes an array having a plurality of lens areas. The employment of the diffraction element renders a shorter imaging distance of light from the object and thus a reduction in the size of the apparatus.
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14.发明授权Optical pickup system having multiple diffraction devices and lens holding means 失效具有多个衍射装置和透镜保持装置的光学拾取系统
公开(公告)号：US4918300A
公开(公告)日：1990-04-17
申请号：US324653
申请日：1989-03-17
申请人： Shigeki Tsuji , Hiroshi Ogata
发明人： Shigeki Tsuji , Hiroshi Ogata
摘要： An optical pickup device for reading signal pits on a disk includes a light source, first and second diffraction devices, a first holding member for holding a photosensor and a hollow second holding member for holding an object lens, wherein the first holding member may be rotated inside the second holding member. It is therefore possible to adjust the alignment direction of three light spots projected on an optical disk.
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