Laser power control in an optical disc drive

Details Laser power control in an optical disc drive Laser power control in an optical disc drive

2007-06-06

2010-11-23

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular beam control device

Having particular beam control circuit component

C372S029015, C372S029020, C372S029021, C372S031000, C372S029010

Reexamination Certificate

active

07839906

ABSTRACT:
Exemplary embodiments provide a method and system for controlling laser power in an optical disc drive. The exemplary embodiment of a control system includes at least one control component for generating a control signal; a plant for generating a control output responsive to the control signal; and a dual feedback control loop coupled between the control output of the plant and the control component, the dual feedback control loop comprising a combination of a running optimal power control (ROPC) loop, and an automatic power control (APC) loop that run concurrently for generating respective feedback control signals that are input to the control component for generation of a combined control signal adjustment that is used at least in part to generate the control signal.

REFERENCES:
patent: 4803384 (1989-02-01), Yamane et al.
patent: 2001/0043534 (2001-11-01), Gyo
patent: 2005/0265182 (2005-12-01), Liu et al.

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