Laser power control technique and apparatus for recording...

Details Laser power control technique and apparatus for recording... Laser power control technique and apparatus for recording...

2007-12-04

2007-12-04

Korzuch, William R. (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

C369S047510, C369S116000, C369S047500

Reexamination Certificate

active

10845410

ABSTRACT:
A laser power control apparatus for controlling the output power of a semiconductor laser used to record and reproduce data in and from a recording medium is provided. The laser power control apparatus includes a controller configured to vary the peak output power level of the semiconductor laser in a stepwise manner, calculate a differential efficiency at each of the varied peak output power levels, and determine a laser driving current based on a relation between the differential efficiency and the peak output power level. In addition, a laser driving unit is configured to drive the semiconductor laser using the laser driving current determined by the controller.

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patent: 2002-358682 (2002-12-01), None

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