公开(公告)号：US5412631A

公开(公告)日：1995-05-02

申请号：US87439

申请日：1993-07-08

申请人： Yoshiaki Komma ,  Seiji Nishino ,  Makoto Kato

发明人： Yoshiaki Komma ,  Seiji Nishino ,  Makoto Kato

IPC分类号： G11B7/13 ,  G11B7/135

CPC分类号： G11B7/131 ,  G11B7/1353

摘要： An optical head apparatus consists of a light beam source, a blazed hologram partitioned into diffraction regions for mainly changing the light beam radiated from the light beam source to zero-order diffraction light and secondarily diffracting the light beam to produce beams of unnecessary light such as N-order diffraction light (N.noteq.0), an information medium for storing information, an objective lens for converging the zero-order diffraction light and the unnecessary light at the information medium, and a six-division photo detector having six detecting sections for detecting intensity of first-order diffraction light produced by diffracting the zero-order diffraction light in the blazed hologram. A hologram pattern of the blazed hologram is formed to function as a lens for the unnecessary light. A focus servo signal is produced according to mutual relation among intensities of the first-order diffraction light detected in the six detecting sections to focus the objective lens on the information medium For the zero-order diffraction light. Therefore, the objective lens is not focused on the information medium for the unnecessary light. Also, the beams of the unnecessary light diffracted in each of the diffraction regions of the blazed hologram are greatly widened because numerical apertures of the diffraction regions are small.

摘要翻译： 光头装置由光束源，闪耀的全息图分割成衍射区域，用于主要将从光束源辐射的光束改变为零级衍射光，并且二次衍射光束以产生不必要的光束，例如 N阶衍射光（N NOTEQUAL 0），用于存储信息的信息介质，用于会聚零级衍射光的物镜和信息介质上的不必要光;以及六分光电检测器，具有六个检测部分，用于 检测在闪耀的全息图中衍射零级衍射光产生的一级衍射光的强度。 闪耀全息图的全息图形成为不必要的光的透镜。 根据在六个检测部分中检测到的一级衍射光的强度之间的相互关系产生聚焦伺服信号，以将物镜聚焦在信息介质上用于零级衍射光。 因此，物镜不会聚焦在不需要的光的信息介质上。 此外，由于衍射区域的数值孔径小，所以在闪耀的全息图的每个衍射区域中衍射的不需要的光束被大大地加宽。

公开(公告)号：US5495461A

公开(公告)日：1996-02-27

申请号：US932112

申请日：1992-08-19

申请人： Yoshiaki Komma ,  Seiji Nishino ,  Makoto Kato ,  Kaoru Matsuda

发明人： Yoshiaki Komma ,  Seiji Nishino ,  Makoto Kato ,  Kaoru Matsuda

IPC分类号： G02B5/32 ,  G02F1/09 ,  G11B7/135 ,  G11B11/10 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B7/1353 ,  G11B11/10545 ,  G11B7/1369 ,  G11B7/1381

摘要： An optical pickup head apparatus comprising: a light source; an imaging optics for receiving a linearly polarized light beam emitted from the light source, and converges it on a small spot on an information medium; photodetector units for receiving the light beam being reflected and diffracted at the information medium and output electric signals corresponding to received light quantities; a liquid crystal hologram consisting of a pair of transparent substrates, a liquid crystal sandwiched therebetween through a pair of transparent electrodes, either of the transparent electrodes being formed with a hologram pattern; and a Faraday rotator for rotating a polarized direction of light beam by 45 degrees in a light path leading from the light source to the information medium and, further, rotates the polarized direction of the light beam by 45 degrees in its opposite light path. The liquid crystal hologram is applied a constant voltage so that the light beam reflected at the information medium is diffracted in the liquid crystal hologram to generate .+-.1-order diffraction light beams, and the photodetector units sense both of light quantities of said .+-.1-order diffraction light beams emitted from the liquid crystal hologram. Then, a subtraction between signals representing the light quantities is calculated so as to obtain an information signal.

摘要翻译： 一种光学拾取头装置，包括：光源; 用于接收从光源发射的线偏振光束并将其会聚在信息介质上的小点上的成像光学器件; 用于接收光束的光电检测器单元在信息介质处被反射和衍射并输出对应于接收光量的电信号; 由一对透明基板构成的液晶全息图，通过一对透明电极夹在其间的液晶，透明电极中的任一方形成全息图图案; 以及用于在从光源引导到信息介质的光路中使光束的偏振方向旋转45度的法拉第旋转器，并且进一步使光束的偏振方向在相反的光路中旋转45度。 施加恒定电压，使得在信息介质中反射的光束在液晶全息图中被衍射以产生+/- 1级衍射光束，并且光电检测器单元检测所述+ 从液晶全息图发射的-1级衍射光束。 然后，计算表示光量的信号之间的减法，以获得信息信号。

公开(公告)号：US5648951A

公开(公告)日：1997-07-15

申请号：US415764

申请日：1995-04-03

申请人： Makoto Kato ,  Yoshiaki Komma ,  Shin-ichi Kadowaki ,  Yoshikazu Hori ,  Seiji Nishino ,  Tetsuo Saimi

发明人： Makoto Kato ,  Yoshiaki Komma ,  Shin-ichi Kadowaki ,  Yoshikazu Hori ,  Seiji Nishino ,  Tetsuo Saimi

IPC分类号： G02B5/18 ,  G02B5/32 ,  G02B27/00 ,  G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/131 ,  G02B27/0037 ,  G02B27/4238 ,  G02B27/4277 ,  G02B5/1819 ,  G02B5/1857 ,  G02B5/32 ,  G11B7/094 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/0912

摘要： Disclosed is a compact optical pick-up head apparatus suitable for mass-production, which comprises a light radiation source, an element composed of photodetector split into a plurality of regions and integrated on the same base, an objective lens for focusing a beam from the above source on an optical disk, a blazed hologram integrated to the support member of the lens, a means for driving the support member to which the objective lens and blazed hologram are integrated in response to an output as servo signal output from the photodetector which receives a diffracted beam produced in such a manner that a return beam reflected or diffracted by the optical disk is incident on the objective lens integrated with the above hologram. The optical pickup apparatus according to the present invention employs a region-split-type phase hologram in which a pair of Flesnel zone plate-like patterns, by which a plurality of diffraction wavefronts having a different focus and the same diffraction order are produced outside an optical-axis, are non-superimposedly formed. The above hologram can be blazed with a pinpoint accuracy by lithography using a few mask patterns synthesized by a computer, and further a more preferably blazing can be realized by the combination of the ion beam etching and the lithography. Accordingly, not only noise caused by an unnecessary diffracted beam component but also the offset of a servo signal can be restrained and the size of the objective lens can be reduced by the integration of the entire optical system, which greatly contributes to the superminiaturization of an optical head.

摘要翻译： 公开了一种适用于批量生产的紧凑型光学拾取头装置，其包括光辐射源，由分离成多个区域并集成在同一基底上的光电检测器构成的元件，用于将来自 在光盘上的源极上，与透镜的支撑构件集成的闪耀的全息图，用于驱动支撑构件的装置，物镜和闪耀的全息图响应于作为从接收到的光电检测器输出的伺服信号的输出而被集成到该支撑构件上 以使得由光盘反射或衍射的返回光束入射到与上述全息图集成的物镜上的方式产生的衍射光束。 根据本发明的光学拾取装置采用区域分割型相位全息图，其中一对Flesnel区域板状图案，其中具有不同焦点和相同衍射级的多个衍射波前在外部产生 光轴不叠加地形成。 通过使用由计算机合成的几个掩模图案通过光刻可以使上述全息图以精确的准确度闪耀，并且还可以通过离子束蚀刻和光刻的组合来实现更好的燃烧。 因此，不仅可以抑制由不必要的衍射光束分量引起的噪声，而且可以抑制伺服信号的偏移，并且可以通过整个光学系统的整合来减小物镜的尺寸，这极大地有助于使 光头。

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：US5687153A

公开(公告)日：1997-11-11

申请号：US778508

申请日：1997-01-03

申请人： Yoshiaki Komma ,  Seiji Nishino ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Makoto Kato ,  Tetsuo Saimi

发明人： Yoshiaki Komma ,  Seiji Nishino ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Makoto Kato ,  Tetsuo Saimi

IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B7/135 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B7/1353 ,  G11B11/10543 ,  G11B7/12 ,  G11B7/123 ,  G11B7/0912

摘要： An optical head device includes: a light source for emitting a light beam; an objective lens for converging the light beam on an information storage medium; a hologram for receiving the light beam reflected by the information storage medium and generating diffracted light from the light beam, the hologram having such a polarization anisotropy that it diffracts light in a second polarization state more strongly than light in a first polarization state which is different from the second polarization state; and a photodetector including a plurality of photodetective sections for receiving a part of the diffracted light and outputting a photocurrent in accordance with the intensity of the part of the diffracted light. The optical head device further include a quarter-wave plate disposed between the objective lens and the hologram for causing the polarization state of the light beam reflected by the information storage medium to be the second polarization state; and the hologram is disposed so that the distance between the hologram and the objective lens is shorter than the distance between the hologram and the photodetector.

摘要翻译： 光头装置包括：用于发射光束的光源; 用于将光束会聚在信息存储介质上的物镜; 用于接收由信息存储介质反射的光束并产生来自光束的衍射光的全息图，该全息图具有这样的偏振各向异性，使得它在比第一偏振态不同的光更强烈地衍射具有第二偏振态的光 从第二极化状态; 以及光电检测器，其包括多个光电检测部分，用于接收一部分衍射光并根据部分衍射光的强度输出光电流。 光头装置还包括设置在物镜和全息图之间的四分之一波片，用于使由信息存储介质反射的光束的偏振状态成为第二偏振状态; 并且全息图被设置成使得全息图和物镜之间的距离比全息图和光电检测器之间的距离短。

公开(公告)号：US5594713A

公开(公告)日：1997-01-14

申请号：US564745

申请日：1995-11-29

申请人： Yoshiaki Komma ,  Seiji Nishino ,  Makoto Kato ,  Kaoru Matsuda

发明人： Yoshiaki Komma ,  Seiji Nishino ,  Makoto Kato ,  Kaoru Matsuda

IPC分类号： G02B5/32 ,  G02F1/09 ,  G11B7/135 ,  G11B11/10 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B7/1353 ,  G11B11/10545 ,  G11B7/1369 ,  G11B7/1381

摘要： An optical pickup head apparatus comprising: a light source; an imaging optics for receiving a linearly polarized light beam emitted from the light source, and converges it on a small spot on an information medium; photodetector units for receiving the light beam being reflected and diffracted at the information medium and output electric signals corresponding to received light quantities; a liquid crystal hologram consisting of a pair of transparent substrates, a liquid crystal sandwiched therebetween through a pair of transparent electrodes, either of the transparent electrodes being formed with a hologram pattern; and a Faraday rotator for rotating a polarized direction of light beam by 45 degrees in a light path leading from the light source to the information medium and, further, rotates the polarized direction of the light beam by 45 degrees in its opposite light path. The liquid crystal hologram is applied a constant voltage so that the light beam reflected at the information medium is diffracted in the liquid crystal hologram to generate .+-.1-order diffraction light beams, and the photodetector units sense both of light quantities of said .+-.1-order diffraction light beams emitted from the liquid crystal hologram. Then, a subtraction between signals representing the light quantities is calculated so as to obtain an information signal.

摘要翻译： 一种光学拾取头装置，包括：光源; 用于接收从光源发射的线偏振光束并将其会聚在信息介质上的小点上的成像光学器件; 用于接收光束的光电检测器单元在信息介质处被反射和衍射并输出对应于接收光量的电信号; 由一对透明基板构成的液晶全息图，通过一对透明电极夹在其间的液晶，透明电极中的任一方形成全息图图案; 以及用于在从光源引导到信息介质的光路中使光束的偏振方向旋转45度的法拉第旋转器，并且进一步使光束的偏振方向在相反的光路中旋转45度。 施加恒定电压，使得在信息介质中反射的光束在液晶全息图中被衍射以产生+/- 1级衍射光束，并且光电检测器单元检测所述+ 从液晶全息图发射的-1级衍射光束。 然后，计算表示光量的信号之间的减法，以获得信息信号。

公开(公告)号：US07333405B2

公开(公告)日：2008-02-19

申请号：US11386376

申请日：2006-03-22

申请人： Yoshiaki Komma ,  Hidenori Wada ,  Seiji Nishino

发明人： Yoshiaki Komma ,  Hidenori Wada ,  Seiji Nishino

IPC分类号： G11B7/00

CPC分类号： G11B7/1369 ,  G11B7/08511 ,  G11B7/1378 ,  G11B7/13925 ,  G11B7/13927 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical disk device is provided with an optical pickup that includes a convergent optical system having an objective lens for converging a light beam emitted from the laser light source to form a microspot on an optical disk and an aberration correcting optical system for controlling a spherical aberration of the convergent optical system, and performs information recording or reproduction with respect to a multi-layer optical disk having at least a first recording layer and a second recording layer. In the optical disk device, an operation of changing a correction quantity of the spherical aberration from a value adequate for the first recording layer to a predetermined value is started before an operation of moving a focus position of the microspot from the first layer to the second layer is completed. This allows a focus control to be performed stably with respect to the second recording layer in a state in which the spherical aberration correction already has been carried out, thereby preventing the focus control from failing due to an unsuccessful interlayer jump.

摘要翻译： 光盘装置具有光学拾取器，该光学拾取器包括会聚光学系统，该会聚光学系统具有用于会聚从激光光源发射的光束以在光盘上形成微点的物镜，以及用于控制球面像差的像差校正光学系统 并且对具有至少第一记录层和第二记录层的多层光盘执行信息记录或再现。 在光盘装置中，将微球的聚焦位置从第一层移动到第二层的操作之前开始将球面像差的校正量从适合于第一记录层的值改变到预定值的操作 层完成。 这允许在已经执行球面像差校正的状态下相对于第二记录层稳定地执行聚焦控制，从而防止聚焦控制由于不成功的层间跳跃而失败。

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：US20060181985A1

公开(公告)日：2006-08-17

申请号：US11386381

申请日：2006-03-22

申请人： Yoshiaki Komma ,  Hidenori Wada ,  Seiji Nishino

发明人： Yoshiaki Komma ,  Hidenori Wada ,  Seiji Nishino

IPC分类号： G11B7/00

CPC分类号： G11B7/1369 ,  G11B7/08511 ,  G11B7/1378 ,  G11B7/13925 ,  G11B7/13927 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical disk device is provided with an optical pickup that includes a convergent optical system having an objective lens for converging a light beam emitted from the laser light source to form a microspot on an optical disk and an aberration correcting optical system for controlling a spherical aberration of the convergent optical system, and performs information recording or reproduction with respect to a multi-layer optical disk having at least a first recording layer and a second recording layer. In the optical disk device, an operation of changing a correction quantity of the spherical aberration from a value adequate for the first recording layer to a predetermined value is started before an operation of moving a focus position of the microspot from the first layer to the second layer is completed. This allows a focus control to be performed stably with respect to the second recording layer in a state in which the spherical aberration correction already has been carried out, thereby preventing the focus control from failing due to an unsuccessful interlayer jump.

公开(公告)号：US07034980B2

公开(公告)日：2006-04-25

申请号：US11203914

申请日：2005-08-15

申请人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

发明人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

IPC分类号： G02F1/03 ,  G02F1/01 ,  G02F1/00 ,  G02F1/13 ,  G11B7/00

CPC分类号： G11B7/13925 ,  G02F2203/18 ,  G11B7/0948 ,  G11B7/1369 ,  G11B7/13927 ,  G11B2007/0013

摘要： The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical head and an optical recording/reproducing apparatus using such an optical element. The invention also presents a novel optical recording/reproducing apparatus and optical recording/reproducing method. The optical element, includes a first voltage application electrode 13, a first opposing electrode 17 arranged in opposition to the first voltage application electrode 13, and a first phase changing layer 15 arranged between the first voltage application electrode 13 and the first opposing electrode 17. By changing a voltage between the first voltage application electrode 13 and the first opposing electrode 17, a phase that converts plane waves into spherical waves is imparted on light that is incident on the first phase changing layer 15.

摘要翻译： 本发明提供了一种光学元件，通过该光学元件可以配置光学头，其中当物镜移动时，校正效果几乎没有劣化，以及使用这种光学元件的光学头和光学记录/再现装置。 本发明还提出了一种新颖的光学记录/再现装置和光学记录/再现方法。 光学元件包括第一电压施加电极13，与第一电压施加电极13相对布置的第一相对电极17和布置在第一施加电极13和第一相对电极17之间的第一相变层15。 通过改变第一电压施加电极13和第一相对电极17之间的电压，将入射到第一相变层15上的光转换成球面波的相位。