Optical recorder and laser power control method

Details Optical recorder and laser power control method Optical recorder and laser power control method

2006-09-26

2006-09-26

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal processing for controlling recording light...

Reexamination Certificate

active

07113468

ABSTRACT:
An optical recording apparatus which obtains the most appropriate recording laser power state in real time according to an environmental mark-generation condition. When data is recorded (marks and spaces are generated) by emitting pulse-train-manner laser outputs to an organic-pigment recording medium, a space-period signal value corresponding to a space period is detected in a reflected-light information signal to estimate a first-pulse signal value corresponding to a first pulse. In addition, a second-and-subsequent-pulse signal value corresponding to second and subsequent pulses is detected in the reflected-light information signal. The ratio between the estimated first-pulse signal value and the detected second-and-subsequent-pulse signal value is obtained, and the obtained ratio and a reference ratio are used to generate a laser-power compensation signal to control the power of the laser outputs.

REFERENCES:
patent: 6611481 (2003-08-01), Koishi et al.
patent: 6657935 (2003-12-01), Eguchi et al.
patent: 6967914 (2005-11-01), Udagawa et al.
patent: 2000-298834 (2000-10-01), None
patent: 2002-109739 (2002-04-01), None
U.S. Appl. No. 10/333,739, filed Jan. 28, 2003, Udagawa.
U.S. Appl. No. 10/333,000, filed Jan. 27, 2003, Udagawa et al.

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