Laser power control device

Details Laser power control device Laser power control device

2007-07-24

2007-07-24

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S116000

Reexamination Certificate

active

10705240

ABSTRACT:
A laser power control device for use in an optical recording and/or reproducing apparatus that records data on and/or reproduces data from an optical recording medium by driving a laser diode with a laser diode driver. The device includes: a peak power monitor which monitors a peak power by a sample-and-hold operation, the peak power being output by the laser diode when pits are formed in the optical recording medium; an elimination power monitor which monitors an elimination power by the sample-and-hold operation, the elimination power being output by the laser diode when a space between pits of the optical recording medium is formed; a peak power setter which sets a peak power in the laser diode driver based on a monitoring result of the peak power monitor; an elimination power setter which sets an elimination power in the laser diode driver based on a monitoring result of the elimination power monitor; and a bias power setter which sets a bias power in the laser diode driver based on the monitoring results of the peak power monitor and the elimination power monitor.

REFERENCES:
patent: 6671248 (2003-12-01), Miyabata et al.
patent: 6683836 (2004-01-01), Miyagawa et al.
patent: 6728183 (2004-04-01), Takeuchi et al.
patent: 11-144288 (1999-05-01), None
patent: 200298832 (2000-10-01), None
patent: 2001-0114241 (2001-12-01), None

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