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    FOCUSSING ERROR DETECTOR
    12.
    发明专利
    FOCUSSING ERROR DETECTOR 未知

    公开(公告)号：AU566428B2

    公开(公告)日：1987-10-22

    申请号：AU2402484

    申请日：1984-02-02

    Applicant: SONY CORP

    Inventor： OHSATO KIYOSHI

    IPC: G03B13/36 ,  G02B7/28 ,  G02B7/32 ,  G11B7/09 ,  G02B7/11 ,  G02B27/16

    Abstract: A focussing error detecting apparatus comprises a compound lens and a photodetector, in which the compound lens has first and second lens regions having different back focal lengths separated by a boundary plane which includes the optical axis of light incident on the compound lens. The photodetector has its photodetecting face positioned on the optical axis of the light between the focal points of the two lens regions, and includes first and second photodetecting elements for receiving light passed through the first lens region at its outer and inner sections with respect to the boundary plane, respectively, and third and fourth photodetecting elements for receiving light passed through the second lens region at its outer and inner sections respectively. A focussing error signal is produced from the difference between the sum of signals from the first and fourth photodetecting elements and the sum of signals from the second and third photodetecting elements.

    OPTICAL DISC PLAYERS
    13.
    发明专利
    OPTICAL DISC PLAYERS 未知

    公开(公告)号：GB2124802A

    公开(公告)日：1984-02-22

    申请号：GB8318490

    申请日：1983-07-08

    Applicant: SONY CORP

    Inventor： KUWABARA SHINICHIRO ,  OHSATO KIYOSHI ,  SUGIKI MIKIO

    IPC: G11B7/09 ,  G11B7/095 ,  G11B7/08

    Abstract: In an optical disc player in which a reading light beam is caused to impinge on an optical disc having a record track formed with an alignment of geometric variations such as a plurality of pits provided in response to information to be modulated in intensity by the record track and a photodetector is provided for detecting the reading light beam coming from the optical disc to generate an output varying in response to the variations in intensity of the detected reading light beam; there are provided a first circuit for producing a reproduced information signal having level variations representing the geometric variations and a tracking error signal which may have level variations depending on the size of each segment of the geometric variations on the strength of the output of the photodetector, a second circuit for detecting the duration of a portion corresponding to each segment of the geometric variations of the reproduced information signal or output of the photodetector and extracting selectively the level of the tracking error signal whenever the detected duration is measured within a predetermined time range so as to produce a modified tracking error signal having the extracted level, and a control circuit for performing tracking control in relation to the reading light beam in response to the modified tracking error signal.

    14.
    发明专利
    未知

    公开(公告)号：DE69835712D1

    公开(公告)日：2006-10-12

    申请号：DE69835712

    申请日：1998-03-06

    Applicant: SONY CORP

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

    IPC: G11B7/135 ,  G02B7/02 ,  G02B9/06 ,  G02B13/18 ,  G11B7/1372 ,  G11B7/1374 ,  G11B7/22

    Abstract: An optical pickup incorporates a two-lens system with first and second lenses (13) and (14) being arranged in the following manner: the first lens has a first surface (15) to receive a laser beam radiated from a semiconductor laser and a second surface (16) to direct the laser beam transmitted from the first surface (15) towards the second lens (14); the second lens (14) has a third surface (17) to receive the light flux transmitted from the second surface (16) and a fourth surface (18) to direct the light flux transmitted from the third surface (17) towards an optical disc placed opposite thereto; and the first and fourth surfaces (15, 18) are used as a reference during positioning. The aberrations of the optical pickup are limited within a tolerable limit without incorporating a special device for that purpose even if errors arise in thickness of component lenses of a two-lens system constituting an element of the pickup.

    15.
    发明专利
    未知

    公开(公告)号：DE69736507D1

    公开(公告)日：2006-09-28

    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.

    16.
    发明专利
    未知

    公开(公告)号：ID20342A

    公开(公告)日：1998-12-03

    申请号：ID980328

    申请日：1998-03-05

    Applicant: SONY CORP

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

    IPC: G11B7/135 ,  G11B7/1372 ,  G11B7/1374 ,  G11B7/22 ,  G11B7/09

    Abstract: An optical pickup incorporates a two-lens system with first and second lenses (13) and (14) being arranged in the following manner: the first lens has a first surface (15) to receive a laser beam radiated from a semiconductor laser and a second surface (16) to direct the laser beam transmitted from the first surface (15) towards the second lens (14); the second lens (14) has a third surface (17) to receive the light flux transmitted from the second surface (16) and a fourth surface (18) to direct the light flux transmitted from the third surface (17) towards an optical disc placed opposite thereto; and the first and fourth surfaces (15, 18) are used as a reference during positioning. The aberrations of the optical pickup are limited within a tolerable limit without incorporating a special device for that purpose even if errors arise in thickness of component lenses of a two-lens system constituting an element of the pickup.

    19.
    发明专利
    未知

    公开(公告)号：DE69021018T2

    公开(公告)日：1995-11-30

    申请号：DE69021018

    申请日：1990-11-27

    Applicant: SONY CORP

    Inventor： MIYOSHI HIROSHI ,  KAMATANI YOSHITERU ,  OZUE TADASHI ,  NARAHARA TATSUYA ,  OHSATO KIYOSHI

    IPC: G11B7/003 ,  G11B7/085 ,  G11B7/09 ,  G11B7/135 ,  G11B7/1359 ,  G11B11/105 ,  G11B7/00

    Abstract: A rotary optical head apparatus comprises a first rotary member (18) carrying an objective lens (22) and a second rotary member (28) carrying an image rotator (36). The two rotary members (18, 28) are supported for rotation by means of a single common support shaft (11) so that the axes of rotation of the two rotary members (18, 28) coincide with each other with a high degree of accuracy. Consequently, the linearity of a scanning line of a beam spot which is scanned on an optical magnetic tape (10) is ensured with a high degree of accuracy.

    20.
    发明专利
    未知

    公开(公告)号：DE69112709D1

    公开(公告)日：1995-10-12

    申请号：DE69112709

    申请日：1991-05-28

    Applicant: SONY CORP

    Inventor： FUKUMOTO ATUSHI ,  OHSATO KIYOSHI

    IPC: G11B7/095 ,  G11B7/09

    Abstract: n pairs of light beams are applied to an optical disc (D) to form a plurality of beam spots (SP) 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 (SP). 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 (D) disc whose recording tracks are arragnged at a high density that exceeds the spatial cutoff frequency of an optical system of conventional nature used with the tracking control method.

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