Method and apparatus for controlling laser power using a...

Details Method and apparatus for controlling laser power using a... Method and apparatus for controlling laser power using a...

2007-12-18

2007-12-18

Psitos, Aristotelis M. (Department: 2627)

Dynamic information storage or retrieval

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

Mechanism control by the control signal

C369S059120

Reexamination Certificate

active

10815782

ABSTRACT:
Method for controlling a laser power used in recording on an optical disk includes: causing the laser to emit a test light emission pattern including a multipulse light emission interval and an at-bottom value continuous light emission interval; receiving the test light emission pattern of the laser to convert the pattern to an electric signal and to thereby obtain a light detection signal; calculating a detection value of a multipulse average value from the average value of the light detection signal, and calculating a bottom detection value from the light detection signal to obtain a light emission power characteristic of the laser on a supplied current based on the detection value of the multipulse average value and the bottom detection value; and controlling the current supplied to the laser based on the light emission power characteristic on the current supplied to the laser.

REFERENCES:
patent: 6097020 (2000-08-01), Karasaki
patent: 6611480 (2003-08-01), Ishibashi et al.
patent: 6631109 (2003-10-01), Nakamura
patent: 6728178 (2004-04-01), Koishi et al.
patent: 6781937 (2004-08-01), Nakajo
patent: 2002/0070329 (2002-06-01), Koishi et al.
patent: 2000-244054 (2000-09-01), None
patent: 2002-203320 (2002-07-01), None
MAT (machine assisted translation) of JP 2002-203320.
English Language Abstract of JP2002-203320.
English Language Abstract of JP 2000-244054.

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