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1. 发明授权

US08331207B2 Optical pickup and optical disc unit 失效
标题翻译：光学拾取器和光盘单元
公开(公告)号：US08331207B2
公开(公告)日：2012-12-11
申请号：US12074968
申请日：2008-03-07
申请人： Katsuhiko Izumi , Kazuyoshi Yamazaki , Tomoto Kawamura , Kunikazu Ohnishi
发明人： Katsuhiko Izumi , Kazuyoshi Yamazaki , Tomoto Kawamura , Kunikazu Ohnishi
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0912 , G11B7/131 , G11B7/133 , G11B2007/0013
摘要： For use with a multi-layer optical disc, an optical pickup can eliminate a problem of causing a focus error signal and a tracking error signal to fluctuate due to interference of a signal light beam with a return light beam from another recording surface of a multi-layer optical disc during reproduction with an optical pickup that produces a tracking error signal and a focus error signal from a difference signal based on polarized reflected light.
摘要翻译：为了与多层光盘一起使用，光学拾取器可以消除由于信号光束与来自多个光盘的另一个记录表面的返回光束的干扰而导致聚焦误差信号和跟踪误差信号波动的问题在利用光学拾取器进行再现期间的光盘，其从基于偏振反射光的差分信号产生跟踪误差信号和聚焦误差信号。

2. 发明申请

US20080219119A1 Optical pickup and optical disc unit 失效
标题翻译：光学拾取器和光盘单元
公开(公告)号：US20080219119A1
公开(公告)日：2008-09-11
申请号：US12074968
申请日：2008-03-07
申请人： Katsuhiko Izumi , Kazuyoshi Yamazaki , Tomoto Kawamura , Kunikazu Ohnishi
发明人： Katsuhiko Izumi , Kazuyoshi Yamazaki , Tomoto Kawamura , Kunikazu Ohnishi
IPC分类号： G11B5/58
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0912 , G11B7/131 , G11B7/133 , G11B2007/0013
摘要： Provided is an optical pickup which can eliminate a problem of causing a focus error signal and a tracking error signal to fluctuate due to interference of a signal light beam with a return light beam from another recording surface of a multi-layer optical disc during reproduction,comprising: a laser source for emitting an optical beam, an objective lens for focusing the light beam onto the multi-layer optical disc, a polarizing grating located at a position through which a reflected light beam from the multi-layer optical disc passes, for branching the reflected beam into at least two light beams, that is, a 0-order light beam and a +1-order light beam having a direction of polarization which is orthogonal to that of the 0-order light beam, an optical detector for receiving the two light beams, a first light receiving zone which is provided in the optical detector, and onto which the 0-order light is irradiated, and a second light receiving zone which is provided in the optical detector and onto which the +1-order light beam is irradiated, wherein the optical detector is capable of delivering a push-pull signal obtained from the first light receiving zone, and a signal obtained by a computation formula similar to the push-pull signal, from the second light receiving zone, and for delivering signals capable of creating a tracking error signal and a focus error signal from a difference signal between the two delivered signals.
摘要翻译：提供了一种光学拾取器，其可以消除由于在再现期间由于信号光束与来自多层光盘的另一记录表面的返回光束的干涉而导致聚焦误差信号和跟踪误差信号的波动的问题，包括：用于发射光束的激光源，用于将光束聚焦到多层光盘上的物镜，位于多层光盘反射光束经过的位置的偏振光栅，用于将反射光束分成至少两个光束，即具有正交于0阶光束的偏振方向的0级光束和+ 1级光束，光检测器接收两个光束，设置在光学检测器中的第一光接收区，其上照射0次光的第一光接收区和设置在光学检测器中的第二光接收区并且其上照射了+ 1级光束，其中光学检测器能够传递从第一光接收区获得的推挽信号，以及通过类似于推挽信号的计算公式获得的信号，并且用于从两个传送的信号之间的差分信号传送能够产生跟踪误差信号和聚焦误差信号的信号。

3. 发明申请

US20070019530A1 Photodetector, diffraction grating, optical pickup and optical disc apparatus 有权
$Photodetector, diffraction grating, optical pickup and optical disc apparatus$
标题翻译：光电检测器，衍射光栅，光学拾取器和光盘装置
公开(公告)号：US20070019530A1
公开(公告)日：2007-01-25
申请号：US11369077
申请日：2006-03-07
申请人： Tomoto Kawamura , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
发明人： Tomoto Kawamura , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/1275 , G11B7/1353 , G11B2007/0006
摘要： The present invention provides a photodetector capable of generating highly accurate tracking and focusing error signals free of variations in light quantity caused by interference, in an optical pickup with a two-wavelength multilaser. The photodetector comprises first three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a first wavelength and second three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a second wavelength longer than the first wavelength. The distance between both-end light receiving areas out of the first three light receiving areas is longer than the distance between both-end light receiving areas out of the second three light receiving areas.
摘要翻译：本发明提供了一种能够在具有双波长多光盘的光学拾取器中产生高精度的跟踪和聚焦误差信号的光检测器，该误差信号不受干扰引起的光量的变化。光电检测器包括前三个光接收区域，线性地布置以接收三个光束，分别由从第一波长的激光光源发射的光束分裂，并且第二三个光线接收区域被线性地分配以接收分别由分裂产生的三个光束从比第一波长长的第二波长的激光光源发射的光束。在前三个光接收区域中的两端光接收区域之间的距离比第二三个光接收区域中的两端光接收区域之间的距离长。

4. 发明申请

US20060193219A1 Diffraction grating, optical pickup device, and optical disk apparatus 审中-公开
$Diffraction grating, optical pickup device, and optical disk apparatus$
标题翻译：衍射光栅，光学拾取装置和光盘装置
公开(公告)号：US20060193219A1
公开(公告)日：2006-08-31
申请号：US11334453
申请日：2006-01-19
申请人： Tomoto Kawamura , Katsuhiko Izumi , Kunikazu Ohnishi , Kenichi Shimada
发明人： Tomoto Kawamura , Katsuhiko Izumi , Kunikazu Ohnishi , Kenichi Shimada
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/08505 , G11B7/0903 , G11B7/1353 , G11B2007/0006
摘要： An optical pickup device is provided which reduces variations in amplitude of a tracking error signal in a seek operation due to an installation error of the optical pickup device onto an optical disk apparatus, thereby generating the tracking error signal with high accuracy without any influence from stray lights, and which is high in productivity and low cost. Two sub-light beams are focused on at least one of forward and backward sides in a rotational direction of the disk with respect to a main light beam focused on the disk. When n is an integer number, and t is a distance between guide grooves of the disk, the two sub-light beams focused are spaced apart from each other by a distance of t×(n+0.5) in the radial direction of the optical disk. As splitting means for splitting the light beams into a plurality of beams, a diffraction grating is used which has grid grooves spaced apart at equal intervals, but having different angles at the upper and lower parts of an exiting surface of the light beam.
摘要翻译：提供了一种光学拾取装置，其由于光学拾取装置在光盘装置上的安装误差而减少寻道操作中的跟踪误差信号的幅度变化，从而以高精度产生跟踪误差信号，而不受杂散影响灯具，生产效率高，成本低。两个子光束相对于聚焦在盘上的主光束在盘的旋转方向上的前后两者中的至少一个上聚焦。当n是整数时，t是盘的引导槽之间的距离，所聚焦的两个子光束在光盘的径向上彼此间隔开tx（n + 0.5）的距离。作为用于将光束分割为多个光束的分离装置，使用衍射光栅，其具有以相等的间隔间隔开的栅格槽，但在光束的出射表面的上部和下部具有不同的角度。

5. 发明授权

US07706220B2 Photodetector, diffraction grating, optical pickup and optical disc apparatus 有权
$Photodetector, diffraction grating, optical pickup and optical disc apparatus$
标题翻译：光电检测器，衍射光栅，光学拾取器和光盘装置
公开(公告)号：US07706220B2
公开(公告)日：2010-04-27
申请号：US11369077
申请日：2006-03-07
申请人： Tomoto Kawamura , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
发明人： Tomoto Kawamura , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/1275 , G11B7/1353 , G11B2007/0006
摘要： The present invention provides a photodetector capable of generating highly accurate tracking and focusing error signals free of variations in light quantity caused by interference, in an optical pickup with a two-wavelength multilaser. The photodetector comprises first three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a first wavelength and second three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a second wavelength longer than the first wavelength. The distance between both-end light receiving areas out of the first three light receiving areas is longer than the distance between both-end light receiving areas out of the second three light receiving areas.
摘要翻译：本发明提供了一种能够在具有双波长多光盘的光学拾取器中产生高精度的跟踪和聚焦误差信号的光检测器，该误差信号不受干扰引起的光量的变化。光电检测器包括前三个光接收区域，线性地布置以接收三个光束，分别由从第一波长的激光光源发射的光束分裂，并且第二三个光线接收区域被线性地分配以接收分别由分裂产生的三个光束从比第一波长长的第二波长的激光光源发射的光束。在前三个光接收区域中的两端光接收区域之间的距离比第二三个光接收区域中的两端光接收区域之间的距离长。

6. 发明授权

US07936658B2 Photodetector, diffraction grating, optical pickup and optical disc apparatus 有权
$Photodetector, diffraction grating, optical pickup and optical disc apparatus$
标题翻译：光电检测器，衍射光栅，光学拾取器和光盘装置
公开(公告)号：US07936658B2
公开(公告)日：2011-05-03
申请号：US12709613
申请日：2010-02-22
申请人： Tomoto Kawamura , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
发明人： Tomoto Kawamura , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/1275 , G11B7/1353 , G11B2007/0006
摘要： The present invention provides a photodetector capable of generating highly accurate tracking and focusing error signals free of variations in light quantity caused by interference, in an optical pickup with a two-wavelength multilaser. The photodetector comprises first three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a first wavelength and second three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a second wavelength longer than the first wavelength. The distance between both-end light receiving areas out of the first three light receiving areas is longer than the distance between both-end light receiving areas out of the second three light receiving areas.
摘要翻译：本发明提供了一种能够在具有双波长多光盘的光学拾取器中产生高精度的跟踪和聚焦误差信号的光检测器，该误差信号不受干扰引起的光量的变化。光电检测器包括前三个光接收区域，线性地布置以接收三个光束，分别由从第一波长的激光光源发射的光束分裂，并且第二三个光线接收区域被线性地分配以接收分别由分裂产生的三个光束从比第一波长长的第二波长的激光光源发射的光束。在前三个光接收区域中的两端光接收区域之间的距离比第二三个光接收区域中的两端光接收区域之间的距离长。

7. 发明申请

US20100148045A1 PHOTODETECTOR, DIFFRACTION GRATING, OPTICAL PICKUP AND OPTICAL DISC APPARATUS 有权
标题翻译：光电转换器，衍射光栅，光学拾取器和光盘设备
公开(公告)号：US20100148045A1
公开(公告)日：2010-06-17
申请号：US12709613
申请日：2010-02-22
申请人： Tomoto KAWAMURA , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
发明人： Tomoto KAWAMURA , Kunikazu Ohnishi , Masayuki Inoue , Katsuhiko Izumi
IPC分类号： H01L31/0232 , H01L31/09
CPC分类号： G11B7/131 , G11B7/1275 , G11B7/1353 , G11B2007/0006
摘要： The present invention provides a photodetector capable of generating highly accurate tracking and focusing error signals free of variations in light quantity caused by interference, in an optical pickup with a two-wavelength multilaser. The photodetector comprises first three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a first wavelength and second three light receiving areas arranged linearly to receive three light beams respectively resulting from splitting of a light beam emitted from a laser light source of a second wavelength longer than the first wavelength. The distance between both-end light receiving areas out of the first three light receiving areas is longer than the distance between both-end light receiving areas out of the second three light receiving areas.
摘要翻译：本发明提供了一种能够在具有双波长多光盘的光学拾取器中产生高精度的跟踪和聚焦误差信号的光检测器，该误差信号不受干扰引起的光量的变化。光电检测器包括前三个光接收区域，线性地布置以接收三个光束，分别由从第一波长的激光光源发射的光束分裂，并且第二三个光线接收区域被线性地分配以接收分别由分裂产生的三个光束从比第一波长长的第二波长的激光光源发射的光束。在前三个光接收区域中的两端光接收区域之间的距离比第二三个光接收区域中的两端光接收区域之间的距离长。

8. 发明申请

US20130003022A1 SCAN-TYPE IMAGE DISPLAY DEVICE AND SCAN-TYPE PROJECTION DEVICE 审中-公开
标题翻译：扫描型图像显示装置和扫描型投影装置
公开(公告)号：US20130003022A1
公开(公告)日：2013-01-03
申请号：US13532819
申请日：2012-06-26
申请人： Teppei Tanaka , Takeshi Nakao , Masato Sugiyama , Michio Hatagi , Tomoto Kawamura , Hiromi Kita , Kunikazu Ohnishi
发明人： Teppei Tanaka , Takeshi Nakao , Masato Sugiyama , Michio Hatagi , Tomoto Kawamura , Hiromi Kita , Kunikazu Ohnishi
IPC分类号： G03B21/14 , G02B26/10
CPC分类号： G02B26/108 , H04N9/3129 , H04N9/3167 , H04N9/3173
摘要： A polarizing prism is shaped in the form of a hexahedron. A polarizing beam splitter film (PBS film) is arranged approximately in a diagonal direction of the hexahedron. The polarizing prism holds a relationship of A
摘要翻译：偏振棱镜成形为六面体形式。偏振分束膜（PBS膜）大致沿着六面体的对角线方向排列。当偏光棱镜在光束到屏幕的出射方向（Y方向）上的尺寸为A时，其与来自光的光束的入射方向（X方向）的尺寸保持A

9. 发明授权

US07911915B2 Optical pickup and optical information recording apparatus using the same 有权
标题翻译：光拾取器及使用其的光信息记录装置
公开(公告)号：US07911915B2
公开(公告)日：2011-03-22
申请号：US11905526
申请日：2007-10-02
申请人： Kunikazu Ohnishi , Tomoto Kawamura , Masayuki Inoue
发明人： Kunikazu Ohnishi , Tomoto Kawamura , Masayuki Inoue
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0945 , G11B2007/0006
摘要： An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an amplification factor K for sub push-pull signals is varied depending on the type of the optical disk. By such composition of the optical pickup, amplitude deterioration of the tracking error signal accompanying displacement of the object lens is reduced.
摘要翻译：光学拾取器包括分为三个区域的衍射光栅，其中区域中的周期性光栅槽结构的相位相继地从相邻区域中的相位移动90°。在产生差分推挽信号时，副推挽信号的放大系数K根据光盘的类型而变化。通过光学拾取器的这种组合，伴随物镜位移的跟踪误差信号的振幅恶化减小。

10. 发明授权

US07590043B2 Optical pickup and optical information recording apparatus using the same 有权
标题翻译：光拾取器及使用其的光信息记录装置
公开(公告)号：US07590043B2
公开(公告)日：2009-09-15
申请号：US11905529
申请日：2007-10-02
申请人： Kunikazu Ohnishi , Tomoto Kawamura , Masayuki Inoue
发明人： Kunikazu Ohnishi , Tomoto Kawamura , Masayuki Inoue
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0945 , G11B2007/0006
摘要： An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an amplification factor K for sub push-pull signals is varied depending on the type of the optical disk. By such composition of the optical pickup, amplitude deterioration of the tracking error signal accompanying displacement of the object lens is reduced.
摘要翻译：光学拾取器包括分为三个区域的衍射光栅，其中区域中的周期性光栅槽结构的相位相继地从相邻区域中的相位移动90°。在产生差分推挽信号时，副推挽信号的放大系数K根据光盘的类型而变化。通过光学拾取器的这种组合，伴随物镜位移的跟踪误差信号的振幅恶化减小。

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