Automatic power control filter circuit and optical disc device

Details Automatic power control filter circuit and optical disc device Automatic power control filter circuit and optical disc device

2007-02-07

2009-02-03

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S038070, C372S038010, C372S038100

Reexamination Certificate

active

07486711

ABSTRACT:
An automatic power control filter circuit that outputs a signal corrected to make a laser drive current for driving a laser light emitting element irradiating an optical disc with a laser beam become a desired value, on the basis of a signal obtained by sampling and holding a light emission monitor signal corresponding to an output current of a photodetector for detecting output power of the laser light emitting element.

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patent: 2002/0196717 (2002-12-01), Masui et al.
patent: 2003/0112732 (2003-06-01), Masui et al.
patent: 2004/0047263 (2004-03-01), Xang et al.
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patent: 2005/0025031 (2005-02-01), Kodama et al.
patent: 2003-308623 (2003-10-01), None

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