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。

公开(公告)号：US20070064574A1

公开(公告)日：2007-03-22

申请号：US11521664

申请日：2006-09-15

申请人： Yoshiaki Komma ,  Seiji Nishino ,  Hidenori Wada ,  Teruhiro Shiono ,  Sadao Mizuno ,  Hiroshi Shiroiwa

发明人： Yoshiaki Komma ,  Seiji Nishino ,  Hidenori Wada ,  Teruhiro Shiono ,  Sadao Mizuno ,  Hiroshi Shiroiwa

IPC分类号： G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/1275 ,  G11B2007/0006

摘要： A transmission diffraction grating body including a base material being substantially transparent with respect to wavelength λ1 and having a refractive index n0; another base material being substantially transparent with respect to wavelength λ1 and having a refractive index n1, which is formed on the base material having a refractive index n0; and a relief diffraction grating formed on the base material having a refractive index n1; wherein the refractive indexes n1 and n0 satisfy the relationship: n1>n0. Thus, the base material having a refractive index n1 can be formed of a high refractive index material, and when the depth of grating of the diffraction grating is set so that the diffraction grating diffracts the light with wavelength λ1 and does not diffract the light with wavelength λ2, the depth of grating of the diffraction grating can be made to be shallow, thus preventing the loss of the amount of the light with wavelength λ1. Furthermore, since base materials each having a different refractive index are bonded to each other to form a diffraction grating body, it is possible to minimize the use amount of the relatively expensive material having a high refractive index. Furthermore, since the most of the diffraction grating body can be formed of a material having a low refractive index, it is possible to lower the height of the diffraction index body.

摘要翻译： 透射衍射光栅体，其包括相对于波长λ1基本上透明且具有折射率n 0的基材; 另一种基材相对于波长λ1基本上是透明的，并且具有折射率n 1，其形成在折射率为n 0的基材上; 以及形成在折射率为n 1的基材上的浮雕衍射光栅; 其中折射率n 1和n 0满足关系：n 1> n 0。 因此，具有折射率n 1的基材可以由高折射率材料形成，并且当衍射光栅的光栅的深度被设置为使得衍射光栅衍射具有波长λ1的光并且不衍射 具有波长λ2的光，衍射光栅的光栅深度可以变浅，从而防止波长λ1的光量的损失。 此外，由于各自具有不同折射率的基材彼此结合以形成衍射光栅体，所以可以使具有高折射率的相对昂贵的材料的使用量最小化。 此外，由于衍射光栅体的大部分可以由具有低折射率的材料形成，因此可以降低衍射指数体的高度。

公开(公告)号：US06292441B1

公开(公告)日：2001-09-18

申请号：US09061822

申请日：1998-04-16

申请人： Hiroaki Yamamoto ,  Daisuke Ogata ,  Ken'ichi Kasazumi ,  Seiji Nishino ,  Hidenori Wada ,  Sadao Mizuno

发明人： Hiroaki Yamamoto ,  Daisuke Ogata ,  Ken'ichi Kasazumi ,  Seiji Nishino ,  Hidenori Wada ,  Sadao Mizuno

IPC分类号： G11B700

CPC分类号： G11B7/131 ,  G11B7/0908 ,  G11B7/094 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical head device includes a light source for emitting a light beam having a predetermined wavelength, an optical system for converging the light beam emitted from the light source on an information medium, and a light detector for receiving the light beam reflected from the information medium and detecting a focus error signal based on the received light beam. The light detector includes a plurality of pairs of photodetectors. The light detector generates the focus error signal based on a differential signal generated by each pair of the plurality of pairs of photodetectors. The plurality of pairs of photodetectors are arranged so that a fluctuation in the differential signal generated by at least one of the pairs of the plurality of pairs of photodetectors is cancelled by a fluctuation in the differential signal generated by at least another of the pairs of the plurality of pairs of photodetectors.

摘要翻译： 光头装置包括用于发射具有预定波长的光束的光源，用于将从光源发射的光束会聚在信息介质上的光学系统，以及用于接收从信息介质反射的光束的光检测器 以及基于所接收的光束检测聚焦误差信号。 光检测器包括多对光电检测器。 光检测器基于由每对多个光电检测器生成的差分信号产生聚焦误差信号。 多对光检测器被布置成使得由多对光检测器中的至少一对成对的光检测器产生的差分信号的波动被由至少另一对成对的光检测器产生的差分信号的波动所抵消 多对光电探测器。

公开(公告)号：US20060233071A1

公开(公告)日：2006-10-19

申请号：US11443750

申请日：2006-05-31

申请人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

发明人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1398 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1372 ,  G11B7/1378 ,  G11B7/13922 ,  G11B7/13925

摘要： An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source on an optical information medium with an objective lens. A chromatic aberration correction element for correcting chromatic aberration occurring in the objective lens is provided between the semiconductor laser light source and the optical information medium. A light distribution correction element in which the transmittance increases with the distance from the center of the aperture surface of the objective lens is provided so as to correct a reduction of the intensity of the light incident on the aperture surface of the objective lens with the distance from the center of the aperture surface.

公开(公告)号：US5815293A

公开(公告)日：1998-09-29

申请号：US455934

申请日：1995-05-31

申请人： Yoshiaki Komma ,  Sadao Mizuno ,  Seiji Nishino

发明人： Yoshiaki Komma ,  Sadao Mizuno ,  Seiji Nishino

IPC分类号： G02B3/10 ,  G02B5/18 ,  G02B5/32 ,  G02B21/02 ,  G02B21/18 ,  G02B21/20 ,  G03F9/00 ,  G11B7/00 ,  G11B7/085 ,  G11B7/13 ,  G11B7/135 ,  G11B19/12 ,  G02B3/08 ,  G02B7/00

CPC分类号： G02B5/1895 ,  G02B21/025 ,  G02B21/18 ,  G02B21/20 ,  G02B27/4238 ,  G02B3/10 ,  G02B5/18 ,  G02B5/1814 ,  G02B5/1842 ,  G02B5/1871 ,  G02B5/1876 ,  G02B5/32 ,  G03F9/70 ,  G03F9/7049 ,  G03F9/7069 ,  G03F9/7088 ,  G11B19/12 ,  G11B19/127 ,  G11B7/08511 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1374 ,  G11B7/139 ,  G11B2007/0006 ,  G11B2007/13727

摘要： A compound objective lens is composed of a hologram lens or transmitting a part of incident light without any diffraction to form a beam of transmitted light and diffracting a remaining part of the incident light to form a beam of first-order diffracted light, and an objective lens for converging the transmitted light to form a first converging spot on a front surface of a thin type of first information medium and converging the diffracted light to form a second converging spot on a front surface of a thick type of second information medium. Because the hologram selectively functions as a concave lens for the diffracted light, a curvature of the transmitted light differs from that of the diffracted light. Therefore, even though the first and second information mediums have different thicknesses, the transmitted light incident on rear surface of the first information medium is converged on the its front surface, and the diffracted light incident on a rear surface of the second information medium is converged on the its front surface. That is, the compound objective lens has two focal points.

摘要翻译： 复合物镜由全息透镜构成或透射入射光的一部分而没有任何衍射形成透射光束，衍射入射光的剩余部分以形成一级衍射光束，目标 透镜，用于会聚透射光以在薄型第一信息介质的前表面上形成第一会聚点，并且会聚衍射光以在厚型第二信息介质的前表面上形成第二会聚点。 由于全息图有选择地用作衍射光的凹透镜，透射光的曲率与衍射光的曲率不同。 因此，即使第一信息介质和第二信息介质具有不同的厚度，入射在第一信息介质的后表面上的透射光会聚在其前表面上，并且入射在第二信息介质的后表面上的衍射光会聚 在其前面。 也就是说，复合物镜具有两个焦点。

公开(公告)号：US5644413A

公开(公告)日：1997-07-01

申请号：US501351

申请日：1995-07-12

申请人： Yoshiaki Komma ,  Sadao Mizuno ,  Makoto Kato ,  Hidenori Wada ,  Seiji Nishino

发明人： Yoshiaki Komma ,  Sadao Mizuno ,  Makoto Kato ,  Hidenori Wada ,  Seiji Nishino

IPC分类号： G02B5/18 ,  G02B5/32 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1353 ,  G02B5/1876 ,  G02B5/32 ,  G11B7/126 ,  G11B7/127 ,  G11B7/1359 ,  G11B7/1376 ,  G11B7/1378 ,  G11B7/13922 ,  G11B7/0912 ,  Y10S359/90

摘要： An optical head apparatus consists of a semiconductor laser for radiating a light beam, a first collimator lens for collimating the light beam, a wedge-like prism for reshaping the light beam, a beam splitter for transmitting the light beam in an outgoing path and splitting the light beam in an incoming path, an objective lens for converging the light beam at an information medium in which information is stored, a plane type of hologram lens integrally formed with the objective lens for excessively correcting chromatic aberration of the objective lens to cancel out chromatic aberration of the collimator lens, a second collimator lens for converging the light beam split, a photo detector for detecting intensity of the light beam converged to obtain an information signal and servo signals, and an actuating unit for slightly moving the objective lens and the hologram lens according to the servo signals. A wavelength of the light beam is lengthened as intensity of the light beam is increased. Even though an astigmatic difference occurs in the semiconductor laser, the change of a focal length of the collimator lens cancels out the change of the astigmatic difference to prevent the occurrence of astigmatic aberration.

摘要翻译： 光头装置由用于照射光束的半导体激光器，用于准直光束的第一准直透镜，用于整形光束的楔形棱镜，用于在输出路径中传输光束的分束器和分离器 入射路径中的光束，用于在存储信息的信息介质处会聚光束的物镜，与物镜整体形成的平面型全息透镜，用​​于过度校正物镜的色差以抵消 准直透镜的色差，用于会聚光束的第二准直透镜，用于检测会聚的光束的强度的光检测器，以获得信息信号和伺服信号，以及用于使物镜稍微移动的致动单元 全息透​​镜根据伺服信号。 当光束的强度增加时，光束的波长被延长。 即使在半导体激光器中出现散像差异，准直透镜的焦距的变化抵消像散差的变化，从而防止散光像差的发生。

公开(公告)号：US07330419B2

公开(公告)日：2008-02-12

申请号：US11443751

申请日：2006-05-31

申请人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

发明人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1398 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1372 ,  G11B7/1378 ,  G11B7/13922 ,  G11B7/13925

摘要： An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source on an optical information medium with an objective lens. A chromatic aberration correction element for correcting chromatic aberration occurring in the objective lens is provided between the semiconductor laser light source and the optical information medium. A light distribution correction element in which the transmittance increases with the distance from the center of the aperture surface of the objective lens is provided so as to correct a reduction of the intensity of the light incident on the aperture surface of the objective lens with the distance from the center of the aperture surface.

摘要翻译： 光头装置包括聚焦光学系统，用于将从半导体激光光源发射的激光束聚焦在具有物镜的光信息介质上。 在半导体激光光源和光信息介质之间设置用于校正物镜中出现的色像差的色像差校正元件。 提供透光率随着距离物镜的孔径表面的中心的距离而增加的光分布校正元件，以便校正入射到物镜的孔表面上的光的强度的降低，距离 从孔表面的中心。

公开(公告)号：USRE41455E1

公开(公告)日：2010-07-27

申请号：US11076588

申请日：2005-03-10

申请人： Yoshiaki Komma ,  Sadao Mizuno ,  Seiji Nishino

发明人： Yoshiaki Komma ,  Sadao Mizuno ,  Seiji Nishino

IPC分类号： G02B5/32 ,  G02B7/00 ,  G02B3/10 ,  G02B3/08

CPC分类号： G02B5/1895 ,  G02B3/10 ,  G02B5/18 ,  G02B5/1814 ,  G02B5/1842 ,  G02B5/1871 ,  G02B5/1876 ,  G02B5/32 ,  G02B21/025 ,  G02B21/18 ,  G02B21/20 ,  G02B27/4238 ,  G03F9/70 ,  G03F9/7049 ,  G03F9/7069 ,  G03F9/7088 ,  G11B7/08511 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1374 ,  G11B7/139 ,  G11B19/12 ,  G11B19/127 ,  G11B2007/0006 ,  G11B2007/13727

摘要： A compound objective lens is composed of a hologram lens or transmitting a part of incident light without any diffraction to form a beam of transmitted light and diffracting a remaining part of the incident light to form a beam of first-order diffracted light, and an objective lens for converging the transmitted light to form a first converging spot on a front surface of a thin type of first information medium and converging the diffracted light to form a second converging spot on a front surface of a thick type of second information medium. Because the hologram selectively functions as a concave lens for the diffracted light, a curvature of the transmitted light differs from that of the diffracted light. Therefore, even though the first and second information mediums have different thicknesses, the transmitted light incident on rear surface of the first information medium is converged on the its front surface, and the diffracted light incident on a rear surface of the second information medium is converged on the its front surface. That is, the compound objective lens has two focal points.

摘要翻译： 复合物镜由全息透镜构成或透射入射光的一部分而没有任何衍射形成透射光束，衍射入射光的剩余部分以形成一级衍射光束，目标 透镜，用于会聚透射光以在薄型第一信息介质的前表面上形成第一会聚点，并且会聚衍射光以在厚型第二信息介质的前表面上形成第二会聚点。 由于全息图有选择地用作衍射光的凹透镜，透射光的曲率与衍射光的曲率不同。 因此，即使第一信息介质和第二信息介质具有不同的厚度，入射在第一信息介质的后表面上的透射光会聚在其前表面上，并且入射在第二信息介质的后表面上的衍射光会聚 在其前面。 也就是说，复合物镜具有两个焦点。

公开(公告)号：US07480227B2

公开(公告)日：2009-01-20

申请号：US11443750

申请日：2006-05-31

申请人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

发明人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1398 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1372 ,  G11B7/1378 ,  G11B7/13922 ,  G11B7/13925

摘要： An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source on an optical information medium with an objective lens. A chromatic aberration correction element for correcting chromatic aberration occurring in the objective lens is provided between the semiconductor laser light source and the optical information medium. A light distribution correction element in which the transmittance increases with the distance from the center of the aperture surface of the objective lens is provided so as to correct a reduction of the intensity of the light incident on the aperture surface of the objective lens with the distance from the center of the aperture surface.

摘要翻译： 光头装置包括聚焦光学系统，用于将从半导体激光光源发射的激光束聚焦在具有物镜的光信息介质上。 在半导体激光光源和光信息介质之间设置用于校正物镜中出现的色像差的色像差校正元件。 提供透光率随着距离物镜的孔径表面的中心的距离而增加的光分布校正元件，以便校正入射到物镜的孔表面上的光的强度的降低，距离 从孔表面的中心。

公开(公告)号：US07110342B2

公开(公告)日：2006-09-19

申请号：US10264297

申请日：2002-10-02

申请人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

发明人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1398 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1372 ,  G11B7/1378 ,  G11B7/13922 ,  G11B7/13925

摘要： An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source on an optical information medium with an objective lens. A chromatic aberration correction element for correcting chromatic aberration occurring in the objective lens is provided between the semiconductor laser light source and the optical information medium. A light distribution correction element in which the transmittance increases with the distance from the center of the aperture surface of the objective lens is provided so as to correct a reduction of the intensity of the light incident on the aperture surface of the objective lens with the distance from the center of the aperture surface.