Laser focus controlling method on an optical disk and an...

Details Laser focus controlling method on an optical disk and an... Laser focus controlling method on an optical disk and an...

2006-10-04

2010-06-29

Chow, Van N (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044340

Reexamination Certificate

active

07746735

ABSTRACT:
In a focus controlling method of a laser beam for an optical disk, achieving a stable focus drawing-in, lowering ill influences due to stray lights, detecting an electric signal, which is obtainable upon basis of a reflection light from the optical disk loaded, in advance, while executing a focus sweep operation of gradually approaching the laser to a recoding surface of the optical disk, at an unnecessary light detection gain being higher than a gain of normal operation, thereby counting a number of signals generated due to unnecessary lights; and thereafter, detecting the electric signal, which is obtainable upon basis of the reflection light from the optical disk loaded, and thereby conducting a focus drawing-in, by considering an electric signal, which is generated just after a number detected thereof reaches to the counted number of signals generated due to the unnecessary lights, to be a signal reflected from the recording surface of the optical disk loaded.

REFERENCES:
patent: 6195319 (2001-02-01), Ohshita et al.
patent: 2002-367193 (2002-12-01), None
patent: 2005-174383 (2005-06-01), None
JP 2005-174383 Method of eliminating stray light offset and optical disk apparatus Sakata Shingo Jun. 2005 (english translation).

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