LIFE SPAN DETECTOR FOR A LASER DIODE AND A COMPACT DISK PLAYER HAVING THE SAME

申请公布号：CA2092762(A1)

申请号：CA19932092762

申请日期：1993.03.26

申请公布日期：1994.07.20

申请人：

SHINANO KENSHI KABUSHIKI KAISHA

发明人：KOBAYASHI, TERUYUKI

分类号：G11B7/125;G11B19/04;G11B33/10;H01S5/00;H01S5/068;H05B43/00;(IPC1-7):H05B43/00

主分类号：G11B7/125

摘要：In a life span detector of the present invention, a current detecting circuit detects current intensity through a laser diode. The current detecting circuits is provided between an electric source and the laser diode. A comparing circuit compares the current intensity detected with predetermined value. The comparing circuit outputs predetermined signal when the current intensity detected is greater than the predetermined value. In a compact disc player of the present invention, an optical pick-up includes a laser diode, and a life span detector detects a life span of the laser diode. By the life span detector, the life span of the laser diode can be timely known. Thus, occurring of the sound skip and the data missing can be prevented.

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