公开(公告)号：US5303250A

公开(公告)日：1994-04-12

申请号：US886091

申请日：1992-05-21

申请人： Hisashi Masuda ,  Kiyoshi Ohsato ,  Atsushi Fukumoto

发明人： Hisashi Masuda ,  Kiyoshi Ohsato ,  Atsushi Fukumoto

IPC分类号： G02F1/37 ,  H01S3/02 ,  H01S3/04 ,  H01S3/042 ,  H01S3/06 ,  H01S3/0941 ,  H01S3/101 ,  H01S3/109 ,  H01S3/131 ,  H01S3/10

CPC分类号： H01S3/0627 ,  H01S3/02 ,  H01S3/109 ,  H01S3/1312 ,  H01S2301/02 ,  H01S3/0071 ,  H01S3/025 ,  H01S3/0405 ,  H01S3/042 ,  H01S3/0604 ,  H01S3/0615 ,  H01S3/09415 ,  H01S5/0683

摘要： A laser light generating apparatus comprises a light source for generating an exciting light beam, a condenser lens for converging the exciting light beam from the light source, a laser medium for generating a laser light of first wavelength by the radiation of the exciting light beam supplied thereto through the condenser lens, a nonlinear optical crystal element for generating a second laser light by the radiation of the first laser light generated from the laser medium, a pair of reflecting means for constituting a laser resonator together with at least the laser medium and the nonlinear optical crystal element, a deflecting element for deflecting an optical axis of the second laser light emitted from reflecting means provided at the emitting side of the pair of reflecting means, detecting means for detecting a part of a light beam output from reflecting means disposed at the output side of the pair of reflecting means, control means for controlling the light source on the basis of a detected output from the detecting means, a base on which there are disposed at least the light source, the condenser lens, the laser medium, the nonlinear optical crystal element, the deflecting element and the detecting means and a housing for housing therein at least the light source, the condenser lens, the laser medium, the nonlinear optical crystal element, the deflecting element, the detecting means and the base.

摘要翻译： 激光发生装置包括用于产生激发光束的光源，用于会聚来自光源的激发光束的聚光透镜，用于通过所提供的激发光束的辐射产生第一波长的激光的激光介质 通过聚光透镜，通过由激光介质产生的第一激光的辐射产生第二激光的非线性光学晶体元件，一对用于与至少激光介质一起构成激光谐振器的反射装置和 非线性光学晶体元件，用于偏转由设置在该对反射装置的发射侧的反射装置发射的第二激光的光轴的偏转元件，用于检测从设置在该反射装置的反射装置输出的光束的一部分的检测装置 一对反射装置的输出侧，用于基于的控制光源的控制装置 来自检测装置的检测输出，至少设置有光源的基座，聚光透镜，激光介质，非线性光学晶体元件，偏转元件和检测装置，以及用于容纳至少 光源，聚光透镜，激光介质，非线性光学晶体元件，偏转元件，检测装置和基座。

公开(公告)号：US5191571A

公开(公告)日：1993-03-02

申请号：US705492

申请日：1991-05-24

申请人： Atsushi Fukumoto ,  Kiyoshi Ohsato

发明人： Atsushi Fukumoto ,  Kiyoshi Ohsato

IPC分类号： G11B7/095 ,  G11B7/09

CPC分类号： G11B7/0903 ,  G11B7/0943

摘要： n pairs of light beams are applied to an optical disc to form a plurality of beam spots thereon which are offset by 1/2n of a track pitch p, and n signals which are shifted p/2n in spatial phase are generated from detected output signals indicative of light beams reflected from the beam spots. These n signals are multiplied to produce a tracking control signal whose spatial period is 1/n of the track pitch p. Alternatively, the optical disc has n pairs of wobbling pits or servo pits which are offset by 1/2n of a tracking pitch p are disposed on an optical disc, and the n pairs of servo pits are scanned by a light beam to produce n signals that are shifted p/2n in spatial phase. The tracking control method is effective to effect tracking control on an optical disc whose recording tracks are arranged at a high density that exceeds the spatial cutoff frequency of an optical system of conventional nature used with the tracking control method.

公开(公告)号：US4766585A

公开(公告)日：1988-08-23

申请号：US844178

申请日：1986-03-12

申请人： Atsushi Fukumoto ,  Kiyoshi Ohsato ,  Michio Oka

发明人： Atsushi Fukumoto ,  Kiyoshi Ohsato ,  Michio Oka

IPC分类号： G11B7/09 ,  G11B7/095 ,  G11B7/135 ,  G11B7/125

CPC分类号： G11B7/0956 ,  G11B7/0903 ,  G11B7/1353 ,  G11B7/1381

摘要： The present invention is, in an optical head tracking error detecting apparatus in which a laser beam from a semiconductor laser element (1) is introduced into a diffraction grating (3), a 0-order beam and .+-.1st-order beams emitted from the diffraction grating (3) are introduced through a beam splitter (4) to an objective lens (5), a 0-order beam and .+-.1st-order beams of converged beams which are introduced into an optical recording medium (6) and reflected on the optical recording medium (6) are passed through the objective lens (5), reflected on the reflection surface of the beam splitter (4), and then introduced into a photodetector (7), a pair of photo-detection outputs corresponding to said .+-.1st order beams are obtained from the photodetector (7) and on the basis of the difference between the pair of photo-detection outputs, there is generated a tracking error signal corresponding to the tracking state of the 0-order beam on the optical recording medium (6), to provide a pair of positive lenses (9) and (10) between the semiconductor laser element (1) and the diffraction grating (3) and a light shielding member (11) between the pair of positive lenses (9) and (10) to pass therethrough a central beam of the central beam and both side beams which are reflected on the optical recording medium (6), passed through the objective lens (5), the beam splitter (4) and the diffration grating (3) and directed to the semiconductor laser element (1) but to shield the both side beams, whereby to generate a tracking error signal which is not changed by the change of a tangential skew angle of the 0-order beam of an optical head OH relative to the optical recording medium (6).

公开(公告)号：US5090004A

公开(公告)日：1992-02-18

申请号：US549826

申请日：1990-07-09

申请人： Kiyoshi Ohsato ,  Atsushi Fukumoto

发明人： Kiyoshi Ohsato ,  Atsushi Fukumoto

IPC分类号： G11B7/09

CPC分类号： G11B7/094

摘要： In an optical recording and/or reproducing apparatus a main light beam and at least two auxiliary light beams are caused to impinge upon a disc for recording information thereon or reproducing information therefrom in a manner so that light beam spots formed on the disc by two auxiliary light beams are respectively equidistant from a light beam spot formed on the disc by the main light beam with a space between the auxiliary light beam spots in a radial direction of the disc corresponding to N/2 times a track pitch on the disc and the aforementioned light beams are then guided from the disc to a photosensor comprising a first photodetecting element divided into two parts for detecting the main light beam and a second photodetecting element divided into two parts for detecting both auxiliary light beams. A tracking error signal is produced based on a difference between detection outputs derived respectively from two parts of the first photodetecting element and a difference between detection outputs derived respectively from two parts of the second photodetecting element, one of which is subjected to level adjustment for compensating a difference in intensity between the main light beam and each of the auxiliary light beams.

公开(公告)号：US06005834A

公开(公告)日：1999-12-21

申请号：US813346

申请日：1997-03-07

申请人： Fumisada Maeda ,  Toshio Watanabe ,  Isao Ichimura ,  Atsushi Fukumoto ,  Kenji Yamamoto ,  Kiyoshi Ohsato

发明人： Fumisada Maeda ,  Toshio Watanabe ,  Isao Ichimura ,  Atsushi Fukumoto ,  Kenji Yamamoto ,  Kiyoshi Ohsato

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1372 ,  G11B7/0935 ,  G11B7/093

摘要： An optical recording medium recording and reproducing apparatus for recording information on an optical recording medium and/or reproducing information therefrom by irradiating the optical recording medium with laser light by the use of a two-group objective lens composed of at least first and second lenses. This apparatus is provided with: a light source for emitting laser light; a first lens for converging laser light emitted from the light source; a second lens interposed between the first lens and the optical recording medium; a detecting unit for detecting a kind of the recording medium; and a movement unit for changing the distance in the direction of an optical axis between the first and second lenses by causing a relative movement between the first and second lenses. Further, the distance between the first and second lenses is changed by the movement unit, which causes the second lens to move, according to a result of a detection, which is performed by the detecting unit. Thereby, the numerical aperture NA of the objective lens is increased. Moreover, the influence of aberration is mitigated. Consequently, the high-density recording and reproducing of information signals can be achieved.

摘要翻译： 一种用于通过使用由至少第一和第二透镜组成的两组物镜通过用激光照射光学记录介质来在光学记录介质上记录信息和/或再现信息的光学记录介质记录和再现装置。 该装置具有：用于发射激光的光源; 用于会聚从光源发射的激光的第一透镜; 插入在第一透镜和光记录介质之间的第二透镜; 检测单元，用于检测记录介质的种类; 以及移动单元，用于通过使第一和第二透镜之间的相对运动来改变在第一和第二透镜之间的光轴方向上的距离。 此外，根据由检测单元执行的检测结果，第一透镜和第二透镜之间的距离被移动单元改变，这导致第二透镜移动。 由此，物镜的数值孔径NA增大。 此外，减轻了像差的影响。 因此，可以实现信息信号的高密度记录和再现。

公开(公告)号：US4742506A

公开(公告)日：1988-05-03

申请号：US753570

申请日：1985-07-10

申请人： Atsushi Fukumoto ,  Kiyoshi Ohsato ,  Yasunori Terayama

发明人： Atsushi Fukumoto ,  Kiyoshi Ohsato ,  Yasunori Terayama

IPC分类号： G11B7/08 ,  G11B7/095 ,  G11B7/125 ,  G11B7/13 ,  H01S5/022

CPC分类号： G11B7/13 ,  G11B7/08 ,  G11B7/0956 ,  G11B7/127 ,  H01S5/005 ,  H01S5/02252

摘要： There is disclosed a tracking error detecting apparatus for an optical head, which includes a semiconductor laser apparatus, a diffraction grating, a beam splitter, an objective lens and a photo-detector, in which a laser beam from the semiconductor laser apparatus is divided into a main beam and two side beams at both sides of the main beam by the diffraction grating, the three beams are introduced through the beam splitter and the objective lens to an optical recording medium, beams reflected on the optical recording medium are introduced through the objective lens to the beam splitter and reflected thereon, the reflected beams are made incident on the photo-detector and detected outputs of at least two beams of the three beams from the photo-detector are used to produce a tracking error signal corresponding to the tacking state of the main beam on the optical recording medium. In this case, the reflection of the side beam of the reflected beams on the optical recording medium which passes through the objective lens, the beam splitter and the diffraction grating and returns to the semiconductor laser apparatus is redirected at a laser beam emission header portion to thereby reduce the influence by the skew of the optical disc on the tracking error signal.

摘要翻译： 公开了一种用于光学头的跟踪误差检测装置，其包括半导体激光装置，衍射光栅，分束器，物镜和光电检测器，其中来自半导体激光装置的激光束被分成 通过衍射光栅在主光束两侧的主光束和两个侧光束，通过分束器和物镜将三个光束引入光记录介质，通过目标引入在光记录介质上反射的光束 透镜到分束器并在其上反射，反射光束入射到光检测器上，来自光检测器的三束光束的至少两束光的检测输出用于产生对应于定位状态的跟踪误差信号 主光束在光记录介质上。 在这种情况下，通过物镜，分束器和衍射光栅并返回到半导体激光装置的光记录介质上的反射光束的侧光束的反射在激光束发射头部被重定向到 从而减少光盘的偏斜对跟踪误差信号的影响。

公开(公告)号：US6115347A

公开(公告)日：2000-09-05

申请号：US919119

申请日：1997-08-28

申请人： Isao Ichimura ,  Fumisada Maeda ,  Kenji Yamamoto ,  Kiyoshi Ohsato ,  Toshio Watanabe ,  Atsushi Fukumoto ,  Akira Suzuki

发明人： Isao Ichimura ,  Fumisada Maeda ,  Kenji Yamamoto ,  Kiyoshi Ohsato ,  Toshio Watanabe ,  Atsushi Fukumoto ,  Akira Suzuki

IPC分类号： G11B7/09 ,  G11B7/135 ,  G11B7/22 ,  G11B11/105 ,  G11B7/00

CPC分类号： B82Y10/00 ,  G11B11/10543 ,  G11B7/0935 ,  G11B7/1387 ,  G11B7/22 ,  G11B2007/13727 ,  G11B7/0927

摘要： An optical pickup device for improving the numerical aperture of an objective lens and for assuring high-reliability recording/reproduction of information signals. The optical pickup device has a first lens 6 having a curvilinear or planar surface facing an optical recording medium 5 and having the numerical aperture set to a pre-set value, and a second lens 3 arranged for clamping the first lens 6 between t and the optical recording medium 5. The optical pickup device also has a light-converging optical system for converging the reflected light from the surface of the optical recording medium 5 and a first movement unit 2 for moving the first objective lens 6 and the second lens 3 along the direction of the optical axis with respect to the second objective lens 3. The optical pickup device also has a second movement unit 11 for moving the first objective lens 6 along the direction of the optical axis relative to the second objective lens 3 and a fixation unit 12 for fixing the first objective lens 6 moved by the second movement unit 9. The method for adjusting the optical processing device includes a step of adjusting the position along the optical axis of the first objective lens 6 and a step of fixing the position of the first lens 6.

摘要翻译： 一种用于改善物镜的数值孔径并确保信息信号的高可靠性记录/再现的光学拾取装置。 光学拾取装置具有第一透镜6，其具有面向光学记录介质5的曲面或平面表面，并且具有设定为预设值的数值孔径;以及第二透镜3，其布置成将第一透镜6夹在t和 光学记录介质5.光学拾取装置还具有用于会聚来自光学记录介质5的表面的反射光的聚光光学系统和用于沿第一透镜6和第二透镜3移动的第一移动单元2 相对于第二物镜3的光轴的方向。光学拾取装置还具有用于相对于第二物镜3沿着光轴的方向移动第一物镜6的第二移动单元11和固定 用于固定由第二移动单元9移动的第一物镜6的单元12.用于调整光学处理装置的方法包括以下步骤：沿着opti 第一物镜6的cal轴线和固定第一透镜6的位置的步骤。

公开(公告)号：US6097688A

公开(公告)日：2000-08-01

申请号：US811727

申请日：1997-03-06

申请人： Isao Ichimura ,  Fumisada Maeda ,  Kenji Yamamoto ,  Kiyoshi Ohsato ,  Toshio Watanabe ,  Atsushi Fukumoto ,  Akira Suzuki

发明人： Isao Ichimura ,  Fumisada Maeda ,  Kenji Yamamoto ,  Kiyoshi Ohsato ,  Toshio Watanabe ,  Atsushi Fukumoto ,  Akira Suzuki

IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105

CPC分类号： G11B7/13925 ,  G11B7/1378 ,  G11B11/10543 ,  G11B2007/0006 ,  G11B2007/0013 ,  G11B2007/13727 ,  G11B7/0948

摘要： A recording/reproducing apparatus for an optical recording medium which is used for recording and/or reproducing information on/from the optical recording medium by irradiating the optical recording medium with a laser light using two-group objective lenses comprising at least two lenses as the first and second lenses, is provided so as to comprise a light source emitting the laser light, the first lens for focusing the laser light emitted from the light source, the second lens arranged between the first lens and the optical recording medium, and a device for moving both the first and second lenses relative to each other to change the distance between them in the optical axis direction of the laser beam, so that the moving device moves the second lens to change the distance between the first and second lenses. Consequently, this invention can provide the recording/reproducing apparatus with a larger numerical aperture (NA) and reduce the influence of spherical aberration on the light beam to realize high density recording/reproducing of information signals.

摘要翻译： 一种用于光学记录介质的记录/再现装置，其用于通过使用包括至少两个透镜的两组物镜将激光照射光学记录介质来记录和/或再现信息，作为 第一透镜和第二透镜被设置成包括发射激光的光源，用于聚焦从光源发射的激光的第一透镜，布置在第一透镜和光记录介质之间的第二透镜，以及设备 用于使第一透镜和第二透镜相对于彼此移动以改变它们之间在激光束的光轴方向上的距离，使得移动装置移动第二透镜以改变第一透镜和第二透镜之间的距离。 因此，本发明可以为记录/再现设备提供更大的数值孔径（NA），并且减小球面像差对光束的影响，以实现信息信号的高密度记录/再现。

公开(公告)号：USRE40371E1

公开(公告)日：2008-06-10

申请号：US09726436

申请日：2000-12-01

申请人： Isao Ichimura ,  Fumisada Maeda ,  Kenji Yamamoto ,  Kiyoshi Ohsato ,  Toshio Watanabe ,  Akira Suzuki

发明人： Isao Ichimura ,  Fumisada Maeda ,  Kenji Yamamoto ,  Kiyoshi Ohsato ,  Toshio Watanabe ,  Akira Suzuki

IPC分类号： G11B7/00

CPC分类号： B82Y10/00 ,  G11B7/0935 ,  G11B7/1374 ,  G11B7/24 ,  G11B11/10543 ,  G11B11/10576 ,  G11B2007/13727

摘要： An optical disc recording/reproduction apparatus for recording and/or reproducing a data by applying a beam from an optical head unit through a substrate onto/from a recording layer of the optical disc through, wherein the substrate of the optical disc is 0.3 mm or below; the optical head unit comprises: an objective lens for converging an incident beam and emitting the beam toward the optical disc; a forward lens for converging the beam introduced through the objective lens and applying the beam to the optical disc; a lens holder where the objective lens and the forward lens are fixed; and an actuator for driving the objective lens and the forward lens as a unitary block and controlling at least focusing, the objective lens and the forward lens having a total numerical aperture of 0.8 or above.

摘要翻译： 一种光盘记录/再现装置，用于通过将来自光学头单元的光束通过衬底施加到/从光盘的记录层通过光盘的记录层而记录和/或再现数据，其中光盘的基板为0.3mm或 下面; 光头单元包括：用于会聚入射光束并将光束朝向光盘发射的物镜; 用于会聚通过物镜引入的光束并将光束施加到光盘的前向透镜; 固定有物镜和前透镜的透镜保持架; 以及用于将物镜和前透镜驱动为整体块并且至少控制聚焦的致动器，物镜和前透镜具有0.8或更高的总数值孔径。

公开(公告)号：US06366543B2

公开(公告)日：2002-04-02

申请号：US09819794

申请日：2001-03-29

申请人： Kamon Uemura ,  Kiyoshi Ohsato ,  Akio Yamakawa ,  Masamichi Utsumi

发明人： Kamon Uemura ,  Kiyoshi Ohsato ,  Akio Yamakawa ,  Masamichi Utsumi

IPC分类号： G11B7095

CPC分类号： G11B19/128 ,  G11B7/0901 ,  G11B7/1372 ,  G11B7/1381 ,  G11B7/139 ,  G11B19/12 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical pickup including a light source for radiating a light beam, a diffraction element for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens for converging the light beams separated by the diffraction element on a signal recording surface of the optical recording medium, a light receiving unit having a four-segment first light receiving portion for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions arranged on both sides of the first light receiving portion for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit for generating a first tracking signal based on respective outputs of the first light receiving portion and for generating a second tracking signal based on outputs of the second and third light receiving portions.

摘要翻译： 一种包括用于照射光束的光源的光学拾取器，用于将从光源辐射的光束分成至少三个光束，即主光束和两个侧光束的衍射元件，用于会聚分离的光束的物镜 通过光记录介质的信号记录表面上的衍射元件，具有用于接收由光记录介质的记录表面反射的主光束的四段第一光接收部分和第二和第三光接收部分的光接收单元 布置在第一光接收部分的两侧，用于接收由光记录介质的记录表面反射的侧光束;以及计算单元，用于基于第一光接收部分的各个输出产生第一跟踪信号， 基于第二和第三光接收部分的输出的第二跟踪信号。