Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-11-13
1997-03-11
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4432, 369 4435, 369 4441, G11B 7095
Patent
active
056108834
ABSTRACT:
An optical pickup apparatus which adds the result of synthesizing the outputs of the individual elements of a photosensor for tracking servo to the difference between the outputs of those diagonally arranged elements of a photosensor for focus servo, thus yielding a focus error signal. This design eliminates the need for filters which have conventionally been essential to separate and extract a crosstalk component from a focus error component. This optical pickup apparatus can therefore produce a focus error signal from which the crosstalk component is effectively eliminated.
REFERENCES:
patent: 4074204 (1978-02-01), Broburg et al.
patent: 5084850 (1992-01-01), Yanagawa et al.
patent: 5189651 (1993-02-01), Utsumi
Patent Abstracts of Japan, vol. 14, No. 269 (P-1059) Jun. 11, 1990 & JP-A-02 076 134 (Mitsubishi Electric Corp) Mar. 15, 1990.
Patent Abstracts of Japan, vol. 011, No. 274 (P-612) Sep. 5, 1987 & JP-A-62 073 431 (Hitachi Ltd) Aug. 4, 1987.
Patent Abstracts of Japan, vol. 015, No. 455 (P-1277) Nov. 19, 1991 & JP-A-31 92 534 (Fujitsu Ltd) Aug. 22, 1991.
Pioneer Electronic Corporation
Young W. R.
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