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1. 发明授权

US5790502A Optical pickup with conversion of diffusion angle of outgoing light relative to diffusion angle of incident light 失效
标题翻译：具有相对于入射光扩散角的出射光扩散角转换的光学拾取器
公开(公告)号：US5790502A
公开(公告)日：1998-08-04
申请号：US533789
申请日：1995-09-26
申请人： Shogo Horinouchi , Shigeki Takeuchi , Kazuhiko Higo , Hideki Yoshinaka , Toshihiro Koga , Jiro Mimasa , Hidehiro Kugisaki
发明人： Shogo Horinouchi , Shigeki Takeuchi , Kazuhiko Higo , Hideki Yoshinaka , Toshihiro Koga , Jiro Mimasa , Hidehiro Kugisaki
IPC分类号： G11B7/09 , G11B7/12 , G11B7/135 , G11B7/22 , G11B11/105 , G11B7/00
CPC分类号： G11B7/1356 , G11B11/10543 , G11B11/10576 , G11B7/0903 , G11B7/0909 , G11B7/123 , G11B7/1353 , G11B7/1362 , G11B7/22
摘要： In an optical pickup, light, emitted from a light-emitting element, is transmitted through a first beam splitter film with polarization selectivity, and a zero-order diffraction beam and two (.+-.) first order diffraction beams are produced. These beams are applied in a condensed manner to an optical disk through a condensing element, and the return light beam from the optical disk is fed to a photodetector through a second beam splitter film with polarization selectivity, thereby effecting the recording and reproduction of information, the tracking and the focusing. A diffusion angle conversion hologram is provided between the light-emitting element and the first beam splitter film, and with respect to the diffusion angle conversion hologram, the relation between the diffusion angle of the incident beam and the diffusion angle of the outgoing beam is specified. With this arrangement, the light to be incident on the condensing element can have an ideal spherical wave free from a wave aberration, so that an image spot on the optical disk can be condensed into a diffraction limit, and besides by correcting the phase of the beam, a RF signal with a high C/N ratio, a stable focus error signal and a stable track signal are detected.
摘要翻译：在光学拾取器中，从发光元件发射的光通过具有偏振选择性的第一分束器膜透射，并且产生零级衍射光束和两个（+/-）一阶衍射光束。这些光束以冷凝的方式通过聚光元件施加到光盘，并且来自光盘的返回光束通过具有偏振选择性的第二分束器膜馈送到光电检测器，从而实现信息的记录和再现，跟踪和聚焦。在发光元件和第一分光膜之间设置扩散角转换全息图，并且关于扩散角转换全息图，指定入射光束的扩散角与出射光束的扩散角之间的关系。通过这种布置，入射到聚光元件上的光可以具有没有波像差的理想的球面波，使得光盘上的图像斑点可以被冷凝成衍射极限，并且除了通过校正检测到具有高C / N比的RF信号，稳定的聚焦误差信号和稳定的轨迹信号。

2. 发明授权

US5978344A Method of manufacturing integrated optical pick-up 失效
标题翻译：集成光学拾取器的制造方法
公开(公告)号：US5978344A
公开(公告)日：1999-11-02
申请号：US883374
申请日：1997-06-26
申请人： Shogo Horinouchi , Shigeki Takeuchi , Kazuhiko Higo , Hideki Yoshinaka , Toshihiro Koga , Jiro Mimasa , Hidehiro Kugisaki
发明人： Shogo Horinouchi , Shigeki Takeuchi , Kazuhiko Higo , Hideki Yoshinaka , Toshihiro Koga , Jiro Mimasa , Hidehiro Kugisaki
IPC分类号： G11B7/09 , G11B7/12 , G11B7/135 , G11B7/22 , G11B11/105 , G11B7/00
CPC分类号： G11B7/1356 , G11B11/10543 , G11B11/10576 , G11B7/0903 , G11B7/0909 , G11B7/123 , G11B7/1353 , G11B7/1362 , G11B7/22
摘要： In an optical pickup, light, emitted from a light-emitting element, is transmitted through a first beam splitter film with polarization selectivity, and a zero-order diffraction beam and two (.+-.) first order diffraction beams are produced. These beams are applied in a condensed manner to an optical disk through a condensing element, and the return light beam from the optical disk is fed to a photodetector through a second beam splitter film with polarization selectivity, thereby effecting the recording and reproduction of information, the tracking and the focusing. A diffusion angle conversion hologram is provided between the light-emitting element and the first beam splitter film, and with respect to the diffusion angle conversion hologram, the relation between the diffusion angle of the incident beam and the diffusion angle of the outgoing beam is specified. With this arrangement, the light to be incident on the condensing element can have an ideal spherical wave free from a wave aberration, so that an image spot on the optical disk can be condensed into a diffraction limit, and besides by correcting the phase of the beam, a RF signal with a high C/N ratio, a stable focus error signal and a stable track signal are detected.
摘要翻译：在光学拾取器中，从发光元件发射的光通过具有偏振选择性的第一分束器膜透射，并且产生零级衍射光束和两个（+/-）一阶衍射光束。这些光束以冷凝的方式通过聚光元件施加到光盘，并且来自光盘的返回光束通过具有偏振选择性的第二分束器膜馈送到光电检测器，从而实现信息的记录和再现，跟踪和聚焦。在发光元件和第一分光膜之间设置扩散角转换全息图，并且关于扩散角转换全息图，指定入射光束的扩散角与出射光束的扩散角之间的关系。通过这种布置，入射到聚光元件上的光可以具有没有波像差的理想的球面波，使得光盘上的图像斑点可以被冷凝成衍射极限，并且除了通过校正检测到具有高C / N比的RF信号，稳定的聚焦误差信号和稳定的轨迹信号。

3. 发明授权

US5777975A Optical pickup incorporating an integrated optical guide member 失效
标题翻译：并入有集成光导元件的光拾取器
公开(公告)号：US5777975A
公开(公告)日：1998-07-07
申请号：US603766
申请日：1996-02-20
申请人： Syogo Horinouchi , Shigeki Takeuchi , Hideki Yoshinaka , Toshihiro Koga , Kazuhiko Higo , Hidehiro Kugisaki , Fumiaki Beppu , Jiro Mimasa
发明人： Syogo Horinouchi , Shigeki Takeuchi , Hideki Yoshinaka , Toshihiro Koga , Kazuhiko Higo , Hidehiro Kugisaki , Fumiaki Beppu , Jiro Mimasa
IPC分类号： G02B6/32 , G02B6/42 , G02B27/28 , G11B7/09 , G11B7/12 , G11B7/13 , G11B7/135 , G11B7/22 , G11B11/105 , G11B7/00
CPC分类号： G11B7/1356 , G02B27/283 , G11B11/10543 , G11B7/123 , G11B7/131 , G11B7/1353 , G11B7/1372 , G11B7/0903 , G11B7/0909 , G11B7/094 , G11B7/0943 , G11B7/22
摘要： A light source beam is incident on an optical guide block and converted in its diffusion angle by a diffusion angle conversion film on a second inclined portion of the optical guide block, and reflected by a reflecting film on a first inclined portion. Then, the light is incident on a first beam splitter film on the second inclined portion and split into transmitted light and reflected light. The reflected light is focused an optical disk light reflected from the disc passes through the first beam splitter film, and then is transmitted and reflected by a second beam splitter film on a third inclined portion. This transmitted light is incident on a polarization plane conversion plate between the third inclined portion and a fourth inclined portion, so that P and S polarization components and are transmitted through and reflected by its polarized light splitting portion, respectively. The S polarization component is reflected by its reflecting surface toward light-receiving elements. The reflected light from the second beam splitter film is reflected by a focus error detection element on the second inclined portion, and an incident light-splitting point of the polarized light splitting portion is located between the center of the optical guide block and the light-receiving elements, thereby reducing a light amount loss and also increasing a Kerr rotation angle so that an RF reproduction signal with a high C/N ratio can be obtained.
摘要翻译：光源光束入射到光导块上，并且通过扩散角转换膜在光导块的第二倾斜部分上被扩散角度转换，并由第一倾斜部分上的反射膜反射。然后，光入射到第二倾斜部分上的第一分束器膜上并分裂成透射光和反射光。反射光被聚焦，从盘反射的光盘光通过第一分束器膜，然后在第三倾斜部分上被第二分束器膜透射和反射。该透射光入射到第三倾斜部分和第四倾斜部分之间的偏振平面转换板上，使得P和S偏振分量分别透射并由其偏振光分离部分反射。 S偏振分量被其反射表面反射到光接收元件。来自第二分束器膜的反射光由第二倾斜部分上的聚焦误差检测元件反射，并且偏振光分离部分的入射光分离点位于光导块的中心和发光元件之间，接收元件，从而减少光量损失并且还增加克尔旋转角度，使得可以获得具有高C / N比的RF再现信号。

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