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    61.
    发明专利
    未知

    公开(公告)号：DE69736507T2

    公开(公告)日：2007-04-05

    申请号：DE69736507

    申请日：1997-10-24

    Applicant: SONY CORP

    Inventor： YAMAMOTO KENJI ,  ICHIMURA ISAO ,  MAEDA FUMISADA ,  WATANABE TOSHIO ,  OHSATO KIYOSHI

    IPC: G02B13/00 ,  G02B13/24 ,  G02B3/02 ,  G02B9/06 ,  G02B13/18 ,  G11B7/1374

    Abstract: An objective lens having a doublet structure and a numerical aperture of 0.7 or more and an optical pickup apparatus having this objective lens are adapted to an optical recording medium having a high information recording density, the objective lens being structured such that at least one side is formed into a aspheric surface and the lens elements (3, 4) are made of low-diffusion glass having an Abbe's number of 40 or greater.

    64.
    发明专利
    未知

    公开(公告)号：DE69617287T2

    公开(公告)日：2002-08-08

    申请号：DE69617287

    申请日：1996-02-15

    Applicant: SONY CORP

    Inventor： MAEDA FUMISADA ,  ICHIMURA ISAO ,  YAMAMOTO KENJI ,  OHSATO KIYOSHI ,  WATANABE TOSHIO

    IPC: G11B7/12 ,  G11B7/135

    Abstract: An optical pickup device for condensing the light from a light source on a signal recording surface of an optical recording medium, such as an optical disc (20). A semi-spherical lens (9) of the optical pickup device has a surface (9b) facing an optical disc (20) and has a pre-set refractive index. The optical pickup device also has a slider (12) adapted for securing the lens (9) and for being in sliding contact with an optical disc (20), and a spring plate (13) adapted for thrusting and supporting the slider in sliding contact with the optical disc (20). With the optical pickup device, high density reproduction may be realized, while the tolerance value for warping during disc molding or the tolerance value for warping due to moisture absorption may be increased. In addition, the production yield and the degree of freedom in selecting the disc materials may be improved.

    65.
    发明专利
    未知

    公开(公告)号：DE69617287D1

    公开(公告)日：2002-01-10

    申请号：DE69617287

    申请日：1996-02-15

    Applicant: SONY CORP

    Inventor： MAEDA FUMISADA ,  ICHIMURA ISAO ,  YAMAMOTO KENJI ,  OHSATO KIYOSHI ,  WATANABE TOSHIO

    IPC: G11B7/12 ,  G11B7/135

    Abstract: An optical pickup device for condensing the light from a light source on a signal recording surface of an optical recording medium, such as an optical disc (20). A semi-spherical lens (9) of the optical pickup device has a surface (9b) facing an optical disc (20) and has a pre-set refractive index. The optical pickup device also has a slider (12) adapted for securing the lens (9) and for being in sliding contact with an optical disc (20), and a spring plate (13) adapted for thrusting and supporting the slider in sliding contact with the optical disc (20). With the optical pickup device, high density reproduction may be realized, while the tolerance value for warping during disc molding or the tolerance value for warping due to moisture absorption may be increased. In addition, the production yield and the degree of freedom in selecting the disc materials may be improved.

    66.
    发明专利
    未知

    公开(公告)号：DE69232039D1

    公开(公告)日：2001-10-11

    申请号：DE69232039

    申请日：1992-05-13

    Applicant: SONY CORP

    Inventor： MASUDA HISASHI ,  OHSATO KIYOSHI ,  FUKUMOTO ATSUSHI

    IPC: G02F1/37 ,  H01S3/02 ,  H01S3/04 ,  H01S3/042 ,  H01S3/06 ,  H01S3/0941 ,  H01S3/101 ,  H01S3/109 ,  H01S3/131 ,  H01S3/094

    Abstract: A laser light generating apparatus comprises a light source (1) for generating an exciting light beam, a condenser lens (2) for converging the exciting light beam from the light source (1), a laser medium (5) for generating a laser light of first wavelength by the radiation of the exciting light beam supplied thereto through the condenser lens (2), a nonlinear optical crystal element (6) for generating a second laser light by the radiation of the first laser light generated from the laser medium (5), a pair of reflecting means (7, 3) for constituting a laser resonator (9) together with at least the laser medium (5) and the nonlinear optical crystal element (6), a deflecting element (21) for deflecting an optical axis of the second laser light emitted from reflecting means (7) provided at the emitting side of the pair of reflecting means, detecting means (22) for detecting a part of a light beam output from reflecting means (7) disposed at the output side of the pair of reflecting means, control means (23 to 25) for controlling the light source (1) on the basis of a detected output from the detecting means (22) and a housing (11) for housing a base on which there are disposed at least the light source (1), the condenser lens (2), the laser medium (5) the nonlinear optical crystal element (6), the deflecting element (21) and the detecting means (22).

    67.
    发明专利
    未知

    公开(公告)号：DE69609902T2

    公开(公告)日：2001-03-22

    申请号：DE69609902

    申请日：1996-06-12

    Applicant: SONY CORP

    Inventor： UEMURA KAMON ,  OHSATO KIYOSHI ,  YAMAKAWA AKIO ,  UTSUMI MASAMICHI

    IPC: G11B7/00 ,  G11B7/09 ,  G11B7/135 ,  G11B19/12

    Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) 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 (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.

    DISPOSITIVO DE CAPTACION OPTICO.
    70.
    发明专利
    DISPOSITIVO DE CAPTACION OPTICO. 未知

    公开(公告)号：MX9602266A

    公开(公告)日：1997-10-31

    申请号：MX9602266

    申请日：1996-06-10

    Applicant: SONY CORP

    Inventor： UEMURA KAMON ,  OHSATO KIYOSHI ,  YAMAKAWA AKIO ,  UTSUMI MASAMICHI

    IPC: G11B7/00 ,  G11B7/09 ,  G11B7/135 ,  G11B19/12 ,  G02B26/00

    Abstract: Un dispositivo de captacion optico que incluye una fuente luminosa para irradiar un haz luminoso, un elemento de difraccion para separar un haz luminoso irradiado de la fuente luminosa en por lo menos tres haces, a saber un haz principal y dos haces laterales, un lente objetivo para convergir los haces luminosos separados por el elemento de difraccion sobre una superficie de registro de señales del medio de registro optico, una unidad receptora de luz que tiene una primera porcion receptora de luz de cuatro segmentos para recibir el haz principal reflejado por la superficie de registro del medio de registro optico y segunda y tercera porciones receptoras de luz colocadas a ambos lados de la primera porcion receptora de luz para recibir los haces laterales reflejados mediante la superficie de registro del medio optico, y una unidad de cálculo para generar una primera señal de seguimiento basándose en las salidas respectivas de la primera porcion receptora de luz para generar una segunda señal de seguimiento basándose en las salidas de la segunda y tercera porciones receptoras de luz.

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