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    COUPLED LASER SOURCE, AND DETECTOR SYSTEM
    2.
    发明专利
    COUPLED LASER SOURCE, AND DETECTOR SYSTEM 失效

    公开(公告)号：JPH1011784A

    公开(公告)日：1998-01-16

    申请号：JP6778997

    申请日：1997-03-21

    Applicant: IBM

    Inventor： JACOBOWITZ LAWRENCE ,  DECUSATIS CASIMER MAURICE

    IPC: G11B7/00 ,  G11B7/09 ,  G11B7/125 ,  H01S3/00 ,  H01S5/00 ,  H01S5/062 ,  G11B7/135

    Abstract: PROBLEM TO BE SOLVED: To obtain a mechanism reading and writing information to be stored on a multilayer optical disk by using a semiconductor laser as light source capable of modulating the light output and detecting the change of the current of the light source. SOLUTION: In a diode injection type laser 10 orienting a laser light with a cross fiber 80, the cross fiber 80 calibrates the ununiform divergence of a laser light to be inputted to a lens 100. The light from the lens 100 is headed toward an optical disk or a CD target 30 and the light is reflected from that to a photodetector 40 by passing the lens 100 and the diode injection type laser 10 again. A driving current passing through the diode injection type laser 10 is modulated by a return light from the target 30. Then, the same signal is extracted as a voltage drop generated across a resistor R 90 by providing the resistor R 90 in the current path of a power source 70.

    3.
    发明专利
    未知

    公开(公告)号：DE69713660D1

    公开(公告)日：2002-08-08

    申请号：DE69713660

    申请日：1997-03-20

    Applicant: IBM

    Inventor： DECUSATIS CASIMER MAURICE ,  JACOBOWITZ LAWRENCE

    IPC: G11B7/00 ,  G11B7/09 ,  G11B7/125 ,  H01S3/00 ,  H01S5/00 ,  H01S5/062 ,  G11B7/13 ,  H01S5/068

    Abstract: A semiconductor laser light source acts as its own photodetector in a combined system. Variations in the light returning to the laser cause detectable variations in the laser drive current. In an optical disk storage system, these variations are produced by dithering a focusing lens and the detected current variation is analysed and fed back to control focusing of the laser on the disk.

    5.
    发明专利
    未知

    公开(公告)号：DE69713660T2

    公开(公告)日：2003-02-06

    申请号：DE69713660

    申请日：1997-03-20

    Applicant: IBM

    Inventor： DECUSATIS CASIMER MAURICE ,  JACOBOWITZ LAWRENCE

    IPC: G11B7/00 ,  G11B7/09 ,  G11B7/125 ,  H01S3/00 ,  H01S5/00 ,  H01S5/062 ,  G11B7/13 ,  H01S5/068

    Abstract: A semiconductor laser light source acts as its own photodetector in a combined system. Variations in the light returning to the laser cause detectable variations in the laser drive current. In an optical disk storage system, these variations are produced by dithering a focusing lens and the detected current variation is analysed and fed back to control focusing of the laser on the disk.

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