Optical head and optical disk apparatus for performing focus...

Details Optical head and optical disk apparatus for performing focus... Optical head and optical disk apparatus for performing focus...

2006-10-31

2006-10-31

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044410, C369S053280

Reexamination Certificate

active

07130250

ABSTRACT:
An optical disk apparatus includes an optical detector which has light receiving areas divided nearly concentrically with an optical beam and outputs a signal corresponding to the amount of the reflected light from an optical disk. A surface vicinity detecting section adds up signals from all the light-receiving areas of the optical detector and outputs a detection signal. The detection signal continuously varies so as to have one maximum level while a beam spot of the optical beam moves from the surface of the information medium to the information plane. An information plane detecting section judges that the focus or the beam spot of the optical beam comes closer to the information plane of the optical disk by detecting the gradient of the detection signal. An approach of a condensing lens and the optical disk is judged based on the judgment results, and thus a collision of the condensing lens and the optical disk can be prevented.

REFERENCES:
patent: 5831952 (1998-11-01), Yamada et al.
patent: 6246647 (2001-06-01), Tsutsui et al.
patent: 6314065 (2001-11-01), Akkermans
patent: 6721244 (2004-04-01), Kubota
patent: 52-80802 (1977-07-01), None
patent: 11-120569 (1999-04-01), None
patent: 2000-20969 (2000-01-01), None

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