公开(公告)号：US5920537A

公开(公告)日：1999-07-06

申请号：US13183

申请日：1998-01-26

申请人： Yoshiaki Komma ,  Sadao Mizuno ,  Hideki Hayashi ,  Kenichiro Urairi

发明人： Yoshiaki Komma ,  Sadao Mizuno ,  Hideki Hayashi ,  Kenichiro Urairi

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

CPC分类号： G11B7/1378 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1372 ,  G11B7/139 ,  G11B7/1398 ,  G11B2007/0006

摘要： An optical head apparatus which records or reproduces signals stably on optical disks having different thicknesses. A correction hologram element or a correction filter is provided between a light source and a 2-focus lens in order to decrease optical intensity at a portion distant from the optical axis or to change the optical path length. The light which passes the correction hologram element or a correction filter is converged by the 2-focus lens as a micro-spot on an optical disk. The 2-focus lens comprises a hologram lens which diffracts a part of the light beam and an object lens.

摘要翻译： 一种在具有不同厚度的光盘上稳定地记录或再现信号的光学头装置。 为了降低远离光轴的部分的光强度，或者改变光路长度，在光源和2焦点透镜之间设置校正全息元件或校正滤光器。 通过校正全息元件或校正滤光器的光由作为微点的双焦点透镜会聚在光盘上。 双焦点透镜包括衍射光束的一部分和物镜的全息透镜。

公开(公告)号：US07079456B2

公开(公告)日：2006-07-18

申请号：US10613672

申请日：2003-07-03

申请人： Hidenori Wada ,  Yasuhiro Tanaka ,  Hideki Hayashi ,  Sadao Mizuno

发明人： Hidenori Wada ,  Yasuhiro Tanaka ,  Hideki Hayashi ,  Sadao Mizuno

IPC分类号： G11B7/95

CPC分类号： G11B7/1378 ,  G11B7/1392 ,  G11B7/13925 ,  G11B7/13927 ,  G11B2007/0006

摘要： An optical element having a high capture efficiency and rim intensity is provided. The optical element includes a central axis, a first curved surface extending in the transverse direction with respect to the central axis, a second curved surface extending in the transverse direction with respect to the central axis, and a peripheral surface extending between the first curved surface and the second curved surface. Light is refracted from the time light is incident on the first curved surface to the time the light is emitted from the second curved surface. Thereby, a light intensity distribution of the light emitted from the second curved surface and a light intensity distribution of the light incident on the first curved surface are different from each other, and a rim intensity improvement rate R, which is a rate of the rim intensity of the emitted light with respect to the rim intensity of the incident light is 1.07 or more and 1.5 or less, in which the rim intensity represents a ratio of the central intensity to the peripheral intensity.

摘要翻译： 提供具有高捕获效率和边缘强度的光学元件。 光学元件包括中心轴线，相对于中心轴线在横向方向上延伸的第一弯曲表面，相对于中心轴线沿横向方向延伸的第二弯曲表面，以及在第一弯曲表面 和第二曲面。 光从第一弯曲表面入射到光从第二弯曲表面发射的时间被折射。 由此，从第二曲面发出的光的光强度分布和入射在第一曲面上的光的光强度分布彼此不同，作为轮缘的速度的轮辋强度提高率R 相对于入射光的边缘强度的发射光的强度为1.07以上且1.5以下，其中边缘强度表示中心强度与周边强度的比率。

公开(公告)号：US5347504A

公开(公告)日：1994-09-13

申请号：US993384

申请日：1992-12-18

申请人： Noboru Ito ,  Shinichi Tanaka ,  Hidenori Wada ,  Sadao Mizuno ,  Hideki Hayashi

发明人： Noboru Ito ,  Shinichi Tanaka ,  Hidenori Wada ,  Sadao Mizuno ,  Hideki Hayashi

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/13

CPC分类号： G11B7/131 ,  G11B7/0045 ,  G11B7/0943

摘要： An optical disk apparatus includes a photodetector divided into eight segments which receive the laser beam reflected from the optical disk and produce signals based on the laser beam sport thereon. In this apparatus, these eight segments are combined in several patterns for the recorded information reproduction, the tracking error detection, and the focus error detection, respectively. For the recorded information reproduction, eight segments are used as combined in three segment cells RC1, RC2, and RC3 which extend in a direction parallel to each other such that the segment cell RC1 is in center and is sandwitched by other segment cell RC2 and RC3. The segment cells RC1, RC2, and RC3 are located perpendicular to the recording track of the optical disk and produce three signals C, R, and L indicative of the laser beam intensity of the laser beam spot thereon, respectively. Thus obtained signals C is multiplied by a constant K and then added to the other signals R and L. By selecting suitable value as the constant K, the crosstalk component in the reproduced signal can be reduced.

摘要翻译： 光盘装置包括被分成八个部分的光电检测器，其接收从光盘反射的激光束并基于其上的激光束运动产生信号。 在这种装置中，这八个段分别以记录信息再现，跟踪误差检测和聚焦误差检测的多种模式组合。 对于记录的信息再现，八个段被组合在三个分段单元RC1，RC2和RC3中，它们在彼此平行的方向上延伸，使得分段单元RC1处于中心并被其它分段单元RC2和RC3 。 分段单元RC1，RC2和RC3垂直于光盘的记录轨道定位，并分别产生表示激光束点的激光束强度的三个信号C，R和L。 这样获得的信号C乘以常数K，然后加到其他信号R和L.通过选择合适的值作为常数K，可以减少再现信号中的串扰分量。

公开(公告)号：US06995909B1

公开(公告)日：2006-02-07

申请号：US10089998

申请日：2000-10-05

申请人： Hideki Hayashi ,  Sadao Mizuno

发明人： Hideki Hayashi ,  Sadao Mizuno

IPC分类号： G02B5/18

CPC分类号： G11B7/1353 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/1378 ,  G11B7/139 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

摘要： Conventional lenses for DVD/CD compatible writing/reading are liable to CD jitter deterioration due to phase shifts in a central area.Setting a corresponding base material thickness of an intermediate area of the circumference A2 to greater than 1.2 mm which is the base material thickness of the CD, that is, converging luminous flux that has passed through the intermediate area of the circumference A2 onto a farther place than the information recording surface of the base material thickness of the CD makes it possible to reduce jitter deterioration due to phase shifts. Further, it makes possible to provide a system with higher precision and higher reliability.

摘要翻译： 用于DVD / CD兼容写入/读取的传统透镜由于中心区域的相移而易于产生CD抖动劣化。 将作为CD的基材厚度的中间区域的相应基材厚度设定为大于1.2mm，可以减少由于相移引起的抖动劣化，并消除中心区域与外围区域之间的电平差异， 加工金属模具，延长使用寿命，从而可以使用玻璃作为镜片材料，实现成本降低或提供更高精度和更高可靠性的系统。

公开(公告)号：US5754512A

公开(公告)日：1998-05-19

申请号：US654771

申请日：1996-05-29

申请人： Yoshiaki Komma ,  Sadao Mizuno ,  Hideki Hayashi ,  Kenichiro Urairi

发明人： Yoshiaki Komma ,  Sadao Mizuno ,  Hideki Hayashi ,  Kenichiro Urairi

IPC分类号： G11B7/00 ,  G11B7/135

CPC分类号： G11B7/1378 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1372 ,  G11B7/139 ,  G11B7/1398 ,  G11B2007/0006

摘要： An optical head apparatus which records or reproduces signals stably on optical disks having different thicknesses. A correction hologram element or a correction filter is provided between a light source and a 2-focus lens in order to decrease optical intensity at a portion distant from the optical axis or to change the optical path length. The light which passes the correction hologram element or a correction filter is converged by the 2-focus lens as a micro-spot on an optical disk. The 2-focus lens comprises a hologram lens which diffracts a part of the light beam and an object lens.

摘要翻译： 一种在具有不同厚度的光盘上稳定地记录或再现信号的光学头装置。 为了降低远离光轴的部分的光强度，或者改变光路长度，在光源和2焦点透镜之间设置校正全息元件或校正滤光器。 通过校正全息元件或校正滤光器的光由作为微点的双焦点透镜会聚在光盘上。 双焦点透镜包括衍射光束的一部分和物镜的全息透镜。

公开(公告)号：US5430701A

公开(公告)日：1995-07-04

申请号：US202822

申请日：1994-02-28

申请人： Noboru Ito ,  Shinichi Tanaka ,  Hidenori Wada ,  Sadao Mizuno ,  Hideki Hayashi

发明人： Noboru Ito ,  Shinichi Tanaka ,  Hidenori Wada ,  Sadao Mizuno ,  Hideki Hayashi

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/13

CPC分类号： G11B7/131 ,  G11B7/0045 ,  G11B7/0943

摘要： An optical disk apparatus includes a photodetector divided into eight segments which receive the laser beam reflected from the optical disk and produce signals based on the laser beam sport thereon. In this apparatus, these eight segments are combined in several patterns for the recorded information reproduction, the tracking error detection, and the focus error detection, respectively. For the recorded information reproduction, eight segments are used as combined in three segment cells RC1, RC2, and RC3 which extend in a direction parallel to each other such that the segment cell RC1 is in center and is sandwitched by other segment cell RC2 and RC3. The segment cells RC1, RC2, and RC3 are located perpendicular to the recording track of the optical disk and produce three signals C, R, and L indicative of the laser beam intensity of the laser beam spot thereon, respectively. Thus obtained signals C is multiplied by a constant K and then added to the other signals R and L. By selecting suitable value as the constant K, the crosstalk component in the reproduced signal can be reduced.

摘要翻译： 光盘装置包括被分成八个部分的光电检测器，其接收从光盘反射的激光束并基于其上的激光束运动产生信号。 在这种装置中，这八个段分别以记录信息再现，跟踪误差检测和聚焦误差检测的多种模式组合。 对于记录的信息再现，八个段被组合在三个分段单元RC1，RC2和RC3中，它们在彼此平行的方向上延伸，使得分段单元RC1处于中心并被其它分段单元RC2和RC3 。 分段单元RC1，RC2和RC3垂直于光盘的记录轨道定位，并分别产生表示激光束点的激光束强度的三个信号C，R和L。 这样获得的信号C乘以常数K，然后加到其他信号R和L.通过选择合适的值作为常数K，可以减少再现信号中的串扰分量。

公开(公告)号：US07283451B2

公开(公告)日：2007-10-16

申请号：US10473934

申请日：2002-04-17

申请人： Atsuo Kikuchi ,  Hideki Hayashi ,  Sadao Mizuno

发明人： Atsuo Kikuchi ,  Hideki Hayashi ,  Sadao Mizuno

IPC分类号： G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/1367 ,  G11B7/1374 ,  G11B2007/0006

摘要： An objective lens for converging a light beam emitted from a first light source on a recording surface (17a) of a first optical information recording medium covered with a transparent substrate (7a) and converging a light beam emitted from a second light source on a recording surface (17b) of a second optical information recording medium covered with a transparent substrate (7b) having a thickness greater than the transparent substrate (7a). On an incident plane for the light beam, there are formed a center region (A1), an intermediate region (A2) surrounding the center region (A1), and a peripheral region (A3) surrounding the intermediate region (A2). A diffraction grating (11) is provided on the lens surface of the intermediate region (A2). Between the intermediate region (A2) and the center region (A1), and also between the intermediate region (A2) and the peripheral region (A3), stepped portions (12) are provided for causing an advance or a delay of a phase of a light beam passing through the intermediate region (A2) with respect to the phases of the light beams passing through the center region (A1) and the peripheral region (A3). The stepped portions (12) are formed so that a value of a tertiary spherical aberration on the recording surface (17b) of the second optical information recording medium becomes a value that makes a jitter value of a reproduction signal from the second optical information recording medium not more than 15%.

摘要翻译： 一种物镜，用于将从第一光源发射的光束会聚在由透明基板（7a）覆盖的第一光学信息记录介质的记录表面（17a）上，并将从第二光源发射的光束会聚在 覆盖有厚度大于透明基板（7a）的透明基板（7b）的第二光学信息记录介质的记录表面（17b）。 在光束的入射面上形成有中心区域（A 1），围绕中心区域（A 1）的中间区域（A 2）和围绕中间区域（A 1）的周边区域（A 3） 2）。 衍射光栅（11）设置在中间区域（A 2）的透镜表面上。 在中间区域（A 2）和中心区域（A 1）之间以及中间区域（A 2）与周边区域（A 3）之间，设有台阶部分（12） 相对于通过中心区域（A 1）和周边区域（A 3）的光束的相位通过中间区域（A 2）的光束的相位。 台阶部分（12）被形成为使得第二光学信息记录介质的记录表面（17b）上的三次球面像差的值成为使来自第二光学信息记录的再现信号的抖动值的值 中等不超过15％。

公开(公告)号：US5703856A

公开(公告)日：1997-12-30

申请号：US324262

申请日：1994-10-17

申请人： Hideki Hayashi ,  Sadao Mizuno ,  Noboru Ito ,  Kenichiro Urairi ,  Yoshiaki Komma

发明人： Hideki Hayashi ,  Sadao Mizuno ,  Noboru Ito ,  Kenichiro Urairi ,  Yoshiaki Komma

IPC分类号： G11B7/14 ,  G11B7/00 ,  G11B7/12 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/127 ,  G11B7/1356 ,  G11B7/1381 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

摘要： An optical head for reproducing data from first and second optical disks which are different from each other in at least one of a base material thickness and an available wavelength, includes: a first light source for emitting a first light beam, the first light beam being used for reproducing data from the first optical disk: an optical system designed to converge the first light beam onto the first optical disk in accordance with a base material thickness and an available wavelength of the first optical disk: and a second light source for emitting a second light beam, the second light beam being used for reproducing data from the second optical disk, wherein an optical path length between the second light source and the optical system is different from an optical path length between the first light source and the optical system, and wherein the optical system converges the second light beam onto the second optical disk.

摘要翻译： 一种用于从基材厚度和可用波长中的至少一个中彼此不同的第一和第二光盘再现数据的光学头包括：用于发射第一光束的第一光源，第一光束是 用于从第一光盘再现数据：被设计为根据第一光盘的基材厚度和可用波长将第一光束会聚到第一光盘上的光学系统，以及用于发射第一光盘的第二光源 第二光束，第二光束用于从第二光盘再现数据，其中第二光源和光学系统之间的光路长度不同于第一光源和光学系统之间的光程长度， 并且其中所述光学系统将所述第二光束会聚到所述第二光盘上。

公开(公告)号：US06927375B2

公开(公告)日：2005-08-09

申请号：US10312436

申请日：2001-06-25

申请人： Hiroaki Yamamoto ,  Yoshiaki Komma ,  Shin-ichi Kadowaki ,  Sadao Mizuno

发明人： Hiroaki Yamamoto ,  Yoshiaki Komma ,  Shin-ichi Kadowaki ,  Sadao Mizuno

IPC分类号： G02B5/18 ,  G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G02B27/42 ,  G11B7/00

CPC分类号： G02B5/1833 ,  G02B5/1823 ,  G02B27/4238 ,  G02B27/4255 ,  G02B27/4261 ,  G11B7/0901 ,  G11B7/0943 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1381

摘要： A light beam reflected by an information medium is split by a diffraction optical system into first diffraction light and second diffraction light, which is not a complex conjugate wave of the first diffraction light, in a predetermined energy distribution ratio. The first diffraction light enters a first photodetector (195) of a photodetector and is used for reading out data information recorded on the information medium, while the second diffraction light enters second and third photodetectors (194, 195) and is used for obtaining a servo error signal. With this optical head device, the area of the first photodetector can be reduced, thus allowing a high-speed reproduction of a data signal. Further, the first photodetector becomes less susceptible to stray light. Moreover, the number of head amplifiers, which are needed for detecting the data signal, decreases, and the S/N ratio improves.

摘要翻译： 由信息介质反射的光束以预定的能量分配比例被衍射光学系统分割成不是第一衍射光的复共轭的第一衍射光和第二衍射光。 第一衍射光进入光电检测器的第一光电检测器（195），并且用于读出记录在信息介质上的数据信息，而第二衍射光进入第二和第三光电检测器（194,195），并用于获得伺服 误差信号。 利用该光学头装置，可以减小第一光电检测器的面积，从而允许数据信号的高速再现。 此外，第一光电检测器变得不易受杂散光的影响。 此外，检测数据信号所需的头放大器的数量减少，并且S / N比提高。

公开(公告)号：US07656777B2

公开(公告)日：2010-02-02

申请号：US10516220

申请日：2003-05-26

申请人： Hiroaki Yamamoto ,  Teruhiro Shiono ,  Tatsuo Ito ,  Seiji Nishino ,  Sadao Mizuno

发明人： Hiroaki Yamamoto ,  Teruhiro Shiono ,  Tatsuo Ito ,  Seiji Nishino ,  Sadao Mizuno

IPC分类号： G11B7/24

CPC分类号： G11B7/243 ,  G11B7/00455 ,  G11B7/24038 ,  G11B7/257

摘要： An optical recording medium which is a multilayer optical recording medium including a plurality of recording layers and records or reproduces information by the irradiation of light having a wavelength of λ0. At least one recording layer out of a plurality of recording layers includes a variable absorption film. The variable absorption film contains a material in which an electron energy has a band structure, and the absorption end of an absorption spectrum moves toward a longer wavelength side with a rise in temperature when light is absorbed by transition between electron bands, has a first absorptance to light having a wavelength of λ0 when a film temperature is a first temperature (application environment temperature), and has a second absorptance higher than the first absorptance to light having a wavelength of λ0 when a film temperature is a second temperature higher than the first temperature.

摘要翻译： 一种光记录介质，其是包括多个记录层的多层光记录介质，并且通过照射波长为λ0的光记录或再现信息。 多个记录层中的至少一个记录层包括可变吸收膜。 可变吸收膜含有电子能量具有带状结构的材料，并且当光被电子带之间的过渡吸收时，吸收光谱的吸收端随着温度升高而向较长波长侧移动，具有第一吸收率 当膜温度为第一温度（施加环境温度）时具有λ0的波长的光，并且当膜温度比第一温度高的第一温度时，具有比第一吸光度高于具有波长λ0的光的第二吸收率 温度。