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    Optical device and optical pickup device using the same
    1.
    发明授权
    Optical device and optical pickup device using the same 失效
    光学装置和使用其的光学拾取装置

    公开(公告)号：US5122903A

    公开(公告)日：1992-06-16

    申请号：US492489

    申请日：1990-03-12

    申请人： Shigeru Aoyama ,  Tatsuo Ohgaki ,  Tukasa Yamashita

    发明人： Shigeru Aoyama ,  Tatsuo Ohgaki ,  Tukasa Yamashita

    IPC分类号： G02B3/08 ,  G02B5/18 ,  G11B7/135 ,  G11B11/10 ,  G11B11/105

    CPC分类号： G02B5/188 ,  G02B5/1876 ,  G02B5/189 ,  G11B7/1353

    摘要： An optical element having a substrate and a composite grating pattern formed thereon. The pattern is constituted with two different kinds of grating patterns superimposed on the substrate. When one of the two kinds of grating patterns is formed in a Fresnel lens pattern, a light focusing or collimating function (i.e. a lens function) is implemented. When the other pattern is formed in an equally separated linear grating pattern, the optical element develops the lens function and a function to diffract lights through the linear grating. When one of the two kinds of grating patterns is formed in a Fresnel lens pattern and the other pattern is implemented in an unequally separated linear grating pattern, a lens function to focus lights onto a point and a cylindrical lens function to focus lights in a linear contour are obtained. Consequently, when parallel lights are incident to the optical element, there occurs astigmatism.

    摘要翻译： 具有形成在其上的基板和复合光栅图案的光学元件。 该图案由叠加在基板上的两种不同种类的光栅图案构成。 当在菲涅耳透镜图案中形成两种光栅图案中的一种时，实现光聚焦或准直功能（即透镜功能）。 当另一个图案以均匀分离的线性光栅图形形成时，光学元件产生透镜功能和通过线性光栅衍射光的功能。 当两种光栅图案中的一种形成为菲涅耳透镜图案并且另一图案以不均匀分离的线性光栅图案实现时，透镜功能将光聚焦到点和柱面透镜上，以将光线聚焦成线性 获得轮廓。 因此，当平行光入射到光学元件时，会出现散光。

    Optical pickup device with substantially mutually orthogonal reflection surfaces
    4.
    发明授权
    Optical pickup device with substantially mutually orthogonal reflection surfaces 失效

    公开(公告)号：US5835472A

    公开(公告)日：1998-11-10

    申请号：US62321

    申请日：1993-05-17

    申请人： Noriyoshi Horie ,  Tatsuo Ohgaki ,  Hayami Hosokawa ,  Masami Tada ,  Tsukasa Yamashita

    发明人： Noriyoshi Horie ,  Tatsuo Ohgaki ,  Hayami Hosokawa ,  Masami Tada ,  Tsukasa Yamashita

    IPC分类号： G11B7/12 ,  G11B7/135 ,  G11B11/105 ,  G11B7/00

    CPC分类号： G11B7/1356 ,  G11B7/124 ,  G11B7/1353 ,  G11B11/10543

    摘要： An integrated optical pickup device for a magnetooptical recording medium (e.g. a magnetooptical recording disk) and/or an optical recording medium (e.g. an optical recording disk) in which a plurality of focusing grating couplers are formed on an optical waveguide layer manufactured on a substrate. A light reflected from a magnetooptical disk or an optical disk is guided by the focusing grating couplers into the waveguide layer to be separated and to be converged therethtough. The converged lights are detected so as to produce a tracking error signal, a focusing error signal, and an information readout signal. The plural focusing grating couplers are fabricated at an identical location on the waveguide in a superimposed fashion. This increases the utilization efficiency of reflection light per each unitary area of the focusing grating couplers and hence the signals are obtained in a stable state. Between a semiconductor laser and a collimation lens, there is formed a composite beam splitter having two reflection surfaces. Reflection lights from the magnetooptical disk are respectively reflected by these reflection surfaces and are then received by photosensors. Analyzers are disposed respectively on front sides of the photosensors. The analyzers respectively have polarization directions orthogonal to each other. Each photosensor includes three-partition photodiode. The beam sizing method and the push-pull detection methods are used for detecting the focusing and tracking errors. The optical pickup device can also used to read data from an optical disk. A prism is disposed between a semiconductor laser and a collimation lens. The prism has two reflection surfaces. Reflection lights from a magnetooptical disk are respectively reflected by these reflection surfaces to be received by photosensors. On front sides of the photosensors, there are respectively arranged analyzers respectively having polarization directions orthogonal to each other.