Laser control unit, laser control circuit, and laser-power...

Details Laser control unit, laser control circuit, and laser-power... Laser control unit, laser control circuit, and laser-power...

2008-04-29

2008-04-29

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

07366080

ABSTRACT:
A laser control unit, a laser control circuit and a laser-power adjustment method are provided which are capable of controlling laser power precisely, even if an error is produced in the duty of an optical pulse. A light-receiving element101converts the optical pulse into an electric signal and outputs a photo-detection signal; an LPF114calculates the average value of the optical pulse, based on the photo-detection signal; a DSP124calculates a light-emission power value, based on the average value of the optical pulse and the duty of the optical pulse, and calculates the difference between the light-emission power value and a target power value; an EP-ROM160stores a correction value for correcting a calculation which is executed by the DSP124; the DSP124corrects the calculation, based on the correction value, and controls an electric-current value which is supplied to a semiconductor laser150, based on the calculation result which is obtained from the correction; and a laser drive circuit40drives the semiconductor laser150, based on the electric-current value.

REFERENCES:
patent: 7082094 (2006-07-01), Morishima et al.
patent: 7113468 (2006-09-01), Udagawa
patent: 7200091 (2007-04-01), Masui et al.
patent: 2002-203320 (2002-07-01), None

Affiliated with

Also associated with

Rating

Laser control unit, laser control circuit, and laser-power... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Laser control unit, laser control circuit, and laser-power..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser control unit, laser control circuit, and laser-power... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2747468