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1. 发明授权

US06920101B2 Optical information processor and optical element 有权
公开(公告)号：US06920101B2
公开(公告)日：2005-07-19
申请号：US10616859
申请日：2003-07-10
申请人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
发明人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
IPC分类号： G11B7/09 , G11B7/135 , G11B7/00
CPC分类号： G11B7/139 , G11B7/1353
摘要： An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. This configuration improves recording/reproducing ability since light is focused on an optical disk with high numerical aperture. In addition, since reflected light from the optical disk is detected with low numerical aperture, margins for tilt and defocus are not reduced. Furthermore, since unnecessary signal components contained in the reflected light can be eliminated, a S/N (signal-to-noise ratio) of an information signal also increases. Thus, a high-performance optical disk device can be obtained. Alternatively, by varying the aperture of an objective lens in recording and in reproduction, an optical disk device in which recording density and recording quality are increased without deteriorating reproduction quality can be obtained.

2. 发明授权

US06618343B1 Optical information processor and optical element 有权
标题翻译：光信息处理器和光学元件
公开(公告)号：US06618343B1
公开(公告)日：2003-09-09
申请号：US09436847
申请日：1999-11-09
申请人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
发明人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
IPC分类号： G11B700
CPC分类号： G11B7/139 , G11B7/1353
摘要： An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. This configuration improves recording/reproducing ability since light is focused on an optical disk with high numerical aperture. In addition, since reflected light from the optical disk is detected with low numerical aperture, margins for tilt and defocus are not reduced. Furthermore, since unnecessary signal components contained in the reflected light can be eliminated, a S/N (signal-to-noise ratio) of an information signal also increases. Thus, a high-performance optical disk device can be obtained. Alternatively, by varying the aperture of an objective lens in recording and in reproduction, an optical disk device in which recording density and recording quality are increased without deteriorating reproduction quality can be obtained.
摘要翻译：光盘装置在从半导体激光器到形成大于来自光盘的返回路径的孔径的光盘的入射路径中具有物镜的孔径，或者在记录和重放中变化。这种配置改善了记录/再现能力，因为光聚焦在具有高数值孔径的光盘上。此外，由于以较低的数值孔径检测出来自光盘的反射光，因此不会降低用于倾斜和散焦的余量。此外，由于可以消除包含在反射光中的不必要的信号分量，信息信号的S / N（信噪比）也增加。因此，可以获得高性能光盘装置。或者，通过在记录和再现中改变物镜的孔径，可以获得其中增加记录密度和记录质量而不恶化再现质量的光盘装置。

3. 发明授权

US06930972B2 Optical information processor and optical element 有权
公开(公告)号：US06930972B2
公开(公告)日：2005-08-16
申请号：US10617084
申请日：2003-07-10
申请人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
发明人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
IPC分类号： G11B7/09 , G11B7/135 , G11B7/00
CPC分类号： G11B7/139 , G11B7/1353
摘要： An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. This configuration improves recording/reproducing ability since light is focused on an optical disk with high numerical aperture. In addition, since reflected light from the optical disk is detected with low numerical aperture, margins for tilt and defocus are not reduced. Furthermore, since unnecessary signal components contained in the reflected light can be eliminated, a S/N (signal-to-noise ratio) of an information signal also increases. Thus, a high-performance optical disk device can be obtained. Alternatively, by varying the aperture of an objective lens in recording and in reproduction, an optical disk device in which recording density and recording quality are increased without deteriorating reproduction quality can be obtained.

4. 发明授权

US06819647B2 Optical information processor and optical element 有权
公开(公告)号：US06819647B2
公开(公告)日：2004-11-16
申请号：US10617168
申请日：2003-07-10
申请人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
发明人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
IPC分类号： G11B700
CPC分类号： G11B7/139 , G11B7/1353
摘要： An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. This configuration improves recording/reproducing ability since light is focused on an optical disk with high numerical aperture. In addition, since reflected light from the optical disk is detected with low numerical aperture, margins for tilt and defocus are not reduced. Furthermore, since unnecessary signal components contained in the reflected light can be eliminated, a S/N (signal-to-noise ratio) of an information signal also increases. Thus, a high-performance optical disk device can be obtained. Alternatively, by varying the aperture of an objective lens in recording and in reproduction, an optical disk device in which recording density and recording quality are increased without deteriorating reproduction quality can be obtained.

5. 发明授权

US06888787B2 Optical information processor and optical element 有权
标题翻译：光信息处理器和光学元件
公开(公告)号：US06888787B2
公开(公告)日：2005-05-03
申请号：US10617167
申请日：2003-07-10
申请人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
发明人： Youichi Saitoh , Junichi Asada , Yuichi Takahashi , Seiji Nishiwaki , Kenji Nagashima , Kazuo Momoo , Junji Nagaoka
IPC分类号： G11B7/09 , G11B7/135 , G11B7/00
CPC分类号： G11B7/139 , G11B7/1353
摘要： An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. This configuration improves recording/reproducing ability since light is focused on an optical disk with high numerical aperture. In addition, since reflected light from the optical disk is detected with low numerical aperture, margins for tilt and defocus are not reduced. Furthermore, since unnecessary signal components contained in the reflected light can be eliminated, a S/N (signal-to-noise ratio) of an information signal also increases. Thus, a high-performance optical disk device can be obtained. Alternatively, by varying the aperture of an objective lens in recording and in reproduction, an optical disk device in which recording density and recording quality are increased without deteriorating reproduction quality can be obtained.
摘要翻译：光盘装置在从半导体激光器到形成大于来自光盘的返回路径的孔径的光盘的入射路径中具有物镜的孔径，或者在记录和重放中变化。这种配置改善了记录/再现能力，因为光聚焦在具有高数值孔径的光盘上。此外，由于以较低的数值孔径检测出来自光盘的反射光，因此不会降低用于倾斜和散焦的余量。此外，由于可以消除包含在反射光中的不必要的信号分量，信息信号的S / N（信噪比）也增加。因此，可以获得高性能光盘装置。或者，通过在记录和再现中改变物镜的孔径，可以获得其中增加记录密度和记录质量而不恶化再现质量的光盘装置。

6. 发明授权

US06674709B1 Optical head apparatus 失效
标题翻译：光头设备
公开(公告)号：US06674709B1
公开(公告)日：2004-01-06
申请号：US09553100
申请日：2000-04-20
申请人： Junichi Asada , Seiji Nishiwaki , Yuichi Takahashi , Kenji Nagashima , Hiroaki Matsumiya , Youichi Saitoh , Kazuo Momoo
发明人： Junichi Asada , Seiji Nishiwaki , Yuichi Takahashi , Kenji Nagashima , Hiroaki Matsumiya , Youichi Saitoh , Kazuo Momoo
IPC分类号： G11B700
CPC分类号： G11B7/1263 , G11B7/1362 , G11B7/1378 , G11B7/1398 , G11B2007/13725
摘要： To implement light quantity monitoring with high frequency responsivity and correction of astigmatic differences of a semiconductor laser with a simple configuration with fewer parts. Of the output from a semiconductor laser light source, a peripheral component is entered by a light reflection element into an anterior light monitoring photodetector formed in the vicinity of a semiconductor laser light source. Furthermore, the surface of the reflection sphere of the light reflection element is anamorphic, and thus condensed to an appropriate size on the photodetector without being focused, providing high frequency responsivity. Furthermore, the light reflection element is inclined at a predetermined angle to cancel out astigmatic differences of the optical semiconductor laser light source. In addition, the photodetector is placed so that reflected light is bent by an inclination of the light reflection element, reducing the amount of parallel displacement during adjustment of the light reflection element.
摘要翻译：实现具有高频响应性的光量监测和半导体激光器的散光差异校正，具有更少部件的简单配置。在半导体激光源的输出中，通过光反射元件将外围部件输入到形成在半导体激光光源附近的前光监视光检测器中。此外，光反射元件的反射球的表面是变形的，并因此在不被聚焦的情况下在光电检测器上聚光到适当的尺寸，提供高频响应度。此外，光反射元件以预定角度倾斜以抵消光半导体激光光源的像散差。此外，光电检测器被放置成使得反射光被光反射元件的倾斜弯曲，从而减少了光反射元件调节期间的平行位移量。

7. 发明授权

US06914870B2 Optical head apparatus 失效
标题翻译：光头设备
公开(公告)号：US06914870B2
公开(公告)日：2005-07-05
申请号：US10630304
申请日：2003-07-30
申请人： Junichi Asada , Seiji Nishiwaki , Yuichi Takahashi , Kenji Nagashima , Hiroaki Matsumiya , Youichi Saitoh , Kazuo Momoo
发明人： Junichi Asada , Seiji Nishiwaki , Yuichi Takahashi , Kenji Nagashima , Hiroaki Matsumiya , Youichi Saitoh , Kazuo Momoo
IPC分类号： G02B5/32 , G11B7/09 , G11B7/125 , G11B7/13 , G11B7/135 , G11B7/00
CPC分类号： G11B7/1263 , G11B7/1362 , G11B7/1378 , G11B7/1398 , G11B2007/13725
摘要： To implement light quantity monitoring with high frequency responsivity and correction of astigmatic differences of a semiconductor laser with a simple configuration with a fewer parts.Of the light beam output from a semiconductor laser light source 101, a peripheral beam component is entered by a light reflection element 107 into an anterior light monitoring photodetector 103 formed in the vicinity of a semiconductor laser light source 101. Furthermore, the surface of the reflection sphere of the light reflection element is formed anamorphic, and thus condensed to an appropriate size on the photodetector without being focused, providing high frequency responsivity. Furthermore, the light reflection element 107 is placed inclined at a predetermined angle so as to cancel out astigmatic difference of the optical semiconductor laser light source 101. In addition, the photodetector 103 is placed in the direction so that a reflected light 108 is bent by an inclination of the light reflection element 107, reducing the amount of parallel displacement during adjustment of the light reflection element 107.
摘要翻译：实现具有高频率响应性的光量监测和半导体激光器的散光差异的校正，具有更少部件的简单配置。在从半导体激光光源101输出的光束中，通过光反射元件107将周边光束分量输入到形成在半导体激光光源101附近的前光监视光电检测器103中。此外，光反射元件的反射球的表面形成为变形的，并因此在不被聚焦的情况下在光电检测器上聚光到适当的尺寸，从而提供高频响应度。此外，光反射元件107以预定角度倾斜放置，以抵消光半导体激光源101的像散差。此外，光电检测器103被放置成使得反射光108被光反射元件107的倾斜弯曲，从而减少了光反射元件107的调节期间的平行移动量。

8. 发明授权

US06496453B2 Optical pickup 失效
标题翻译：光学拾音
公开(公告)号：US06496453B2
公开(公告)日：2002-12-17
申请号：US09817421
申请日：2001-03-26
申请人： Junichi Asada , Kenji Nagashima , Hiroshi Kayama , Youichi Saitoh , Seiji Nishiwaki
发明人： Junichi Asada , Kenji Nagashima , Hiroshi Kayama , Youichi Saitoh , Seiji Nishiwaki
IPC分类号： G11B700
CPC分类号： G11B7/1353 , G11B7/123 , G11B7/1275 , G11B7/1356 , G11B7/1359 , G11B7/1362 , G11B7/1365 , G11B7/1376 , G11B7/1395 , G11B7/1398 , G11B2007/0006
摘要： An optical pickup has a light source that emits a light beam having a far field pattern being elliptical in cross section; a collimator lens that converts the light beam from the light source into a substantially parallel light beam; a beam shaping element that performs beam shaping by changing a substantial aspect ratio of the far field pattern of the light beam from the collimator lens; light condensing means of condensing the light beam shaped by the beam shaping element on an optical information recording medium; and light detecting means of detecting a light beam reflected at the optical information recording medium. wherein the beam shaping element makes the cross section of the light beam having been shaped close to a circle by compressing the light beam substantially in a direction of a major axis of the elliptical cross section of the far field pattern, and reflects the light beam from the collimator lens to the light condensing means.
摘要翻译：光拾取器具有发射具有横截面为椭圆形的远场图案的光束的光源;将来自光源的光束转换为基本上平行的光束的准直透镜;通过以下方式执行光束成形的光束整形元件改变来自准直透镜的光束的远场图案的实质长宽比;将由光束整形元件成形的光束会聚在光信息记录介质上的聚光装置; 光检测装置，用于检测在光学信息记录介质处反射的光束。光束成形元件通过将光束基本上沿着长轴的方向压缩而使光束的截面形状接近圆形，远场图案的椭圆截面，并将来自准直透镜的光束反射到聚光装置。

9. 发明申请

US20090279403A1 OPTICAL DISC DEVICE 失效
标题翻译：光盘设备
公开(公告)号：US20090279403A1
公开(公告)日：2009-11-12
申请号：US12296822
申请日：2007-03-19
申请人： Seiji Nishiwaki , Kazuo Momoo , Junichi Asada
发明人： Seiji Nishiwaki , Kazuo Momoo , Junichi Asada
IPC分类号： G11B7/00 , G11B7/135
CPC分类号： G11B7/0903 , G11B7/094 , G11B7/131 , G11B7/1353
摘要： Light emitted from a radiation light source 1 passes through a diffraction grating 3a and is separated into transmitted light a, +1st order diffracted light b, and −1st order diffracted light c. The transmitted light a, +1st order diffracted light b, and −1st order diffracted light c are collected through an objective lens 7 on tracks on the signal plane 8a of an optical disc 8 in a partially overlapped state. Light reflected by the tracks on the signal plane 8a passes through the objective lens 7 and is incident upon light diverging means 13a. Subsequently, depending on the location of incidence, light corresponding to the transmitted light “a” diverges into two light beams that are respectively incident upon light detection regions A1, A2, light corresponding to the +1st order diffracted light “b” diverges into two light beams that are respectively incident upon light detection regions B1, B2, and light corresponding to the −1st order diffracted light “c” diverges into two light beams that are respectively incident upon light detection regions C1, C2. A tracking error signal associated with the tracks of the optical disc 8 is generated by combining signals detected in the light detection regions A1, A2, B1, B2, C1, and C2. Based on the above-described configuration, the influence of lens shift-induced off-track can be cancelled without impairing the detected tracking error signal output even without rotational adjustment of the rectilinear gratings.
摘要翻译：从辐射光源1发射的光通过衍射光栅3a并分离为透射光a + 1级衍射光b和-1级衍射光c。透射光a，+ 1级衍射光b和-1级衍射光c以部分重叠的状态通过物镜7在光盘8的信号平面8a上的轨道上被收集。由信号平面8a上的轨道反射的光通过物镜7并入射到光发散装置13a上。随后，根据入射位置，对应于透射光“a”的光分散到分别入射到光检测区域A1，A2的两个光束中，对应于+ 1级衍射光“b”的光分叉成两个分别入射到光检测区域B1，B2和对应于-1级衍射光“c”的光的光束分叉成分别入射到光检测区域C1，C2的两个光束。通过组合在光检测区域A1，A2，B1，B2，C1和C2中检测到的信号来产生与光盘8的轨道相关联的跟踪误差信号。基于上述配置，即使没有直线光栅的旋转调节，也可以消除透镜偏移诱导偏离磁道的影响，而不损害检测到的跟踪误差信号输出。

10. 发明申请

US20090028036A1 OPTICAL DISC DEVICE 审中-公开
标题翻译：光盘设备
公开(公告)号：US20090028036A1
公开(公告)日：2009-01-29
申请号：US12282598
申请日：2007-03-13
申请人： Seiji Nishiwaki , Kazuo Momoo , Junichi Asada
发明人： Seiji Nishiwaki , Kazuo Momoo , Junichi Asada
IPC分类号： G11B7/135
CPC分类号： G11B7/0901 , G11B7/131 , G11B7/1353 , G11B2007/0013
摘要： The invention permits stable tracking with few control errors, uninfluenced by stray light reflected by signal surfaces other than the signal surface being used for focusing during recording and playback of a multilayer disc. To this end, the optical splitter element of the optical disc device according to the present invention has first areas (21c-24c), which include the location (20) of the optical axis of light incident from the objective lens, and, around the periphery of the first areas, second areas (21a-24a, 21b-24b) positioned at locations displaced from the optical axis. The detection surface (9a) of the photodetector has first detection areas (97, 98) detecting light incident from the first areas and second detection areas (95, 96) detecting light incident from the second areas. The second detection areas are used for detecting tracking error signals. If the optical disc has multiple signal surfaces, light that is reflected by signal surfaces other than the signal surface being used for focusing and is incident on the photodetector from the first areas is not incident on the second detection areas.
摘要翻译：本发明允许具有很少控制误差的稳定跟踪，不受在多层盘的记录和重放期间用于聚焦的信号表面以外的信号表面反射的杂散光的影响。为此，根据本发明的光盘装置的光分路器元件具有第一区域（21c-24c），其包括从物镜入射的光的光轴的位置（20），并且围绕第一区域的周边，位于偏离光轴的位置的第二区域（21a-24a，21b-24b）。光检测器的检测表面（9a）具有检测从第一区域入射的光的第一检测区域（97,98）和检测从第二区域入射的光的第二检测区域（95,96）。第二检测区域用于检测跟踪误差信号。如果光盘具有多个信号表面，则由信号表面以外的信号表面反射的光被用于聚焦并且从第一区域入射到光电检测器上的光不会入射到第二检测区域。

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