Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-01-10
2006-01-10
Psitos, A M (Department: 2653)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044360
Reexamination Certificate
active
06985412
ABSTRACT:
Two sum output signals from two sets of the photodetector elements located symmetrically each other with respect to a light-receiving center of the photodetector of the optical pickup are amplified individually by two amplifiers. A focus error signal is generated in accordance with a difference between respective output levels of the two amplified signals. The gains of the two amplifiers are adjusted in accordance with the focus error signal. A predetermined bias voltage is applied to the focus error signal line in the focus servo control means in accordance with the focus error signal.
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(MAT—machine assisted translation) of JP 10-162485.
Patent Abstracts of Japan: 11073657, Pioneer Electronic Corporation:Focus Control Device and Method. Mar. 16, 1999, 09279078, abstract.
Patent Abstracts of Japan: 10097720, Nikon Corporation:Information Recording and Reproducing Device, Apr. 14, 1998, 08250005, abstract.
Bradshaw Alex
Kimikawa Yuichi
Matsuda Norio
Naohara Shinichi
Pioneer Corporation
Psitos A M
Sughrue & Mion, PLLC
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