Life span detector for a laser diode and a compact disk player h

Details Life span detector for a laser diode and a compact disk player h Life span detector for a laser diode and a compact disk player h

1994-11-10

1996-04-09

Epps, Georgia Y.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, G11B 700

Patent

active

055068260

ABSTRACT:
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 a predetermined value. The comparing circuit outputs a 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 which 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, the occurrence of sound skip and missing data which result from a deteriorated laser diode can be prevented.

REFERENCES:
patent: 4685097 (1987-08-01), van der Put
patent: 4747091 (1988-05-01), Doi
patent: 5019769 (1991-05-01), Levinson
patent: 5172365 (1992-12-01), Call et al.

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