H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 43/00 (2006.01)
Patent
CA 2092762
ABSTRACT OF THE DISCLOSURE 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 pre- determined 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.
Borden Ladner Gervais Llp
Shinano Kenshi Kabushiki Kaisha
LandOfFree
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