Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-01-31
2006-01-31
Miller, Brian E. (Department: 2652)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044360
Reexamination Certificate
active
06992953
ABSTRACT:
A tracking servo apparatus in which reflection light obtained when a laser beam is irradiated onto a recording surface of an optical disc is photoelectrically converted, thereby obtaining a photoelectric conversion signal, a tracking error signal showing a deviation amount of an irradiating position of said laser beam for a track in a disc radial direction on the recording surface is generated by the photoelectric conversion signal, a spherical aberration occurring in an optical system is detected, a level of the tracking error signal is corrected on the basis of the detection result, and the irradiating position of the laser beam is moved in the disc radial direction in accordance with the level-corrected tracking error signal.
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Furukawa Jun-ichi
Kikuchi Ikuya
Maeda Takanori
Nishiwaki Hiroshi
Nomoto Takayuki
Agustin Peter Vincent
Miller Brian E.
Morgan & Lewis & Bockius, LLP
Pioneer Corporation
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