Three-beam detecting system phase difference detector which elim

Details Three-beam detecting system phase difference detector which elim Three-beam detecting system phase difference detector which elim

1995-06-02

1997-07-01

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4437, G11B 7095

Patent

active

056445601

ABSTRACT:
In order that a measurement error of a phase difference based on an eccentricity produced when an optical disc is inserted into a disc spindle and rotated can be eliminated to improve a measurement accuracy, a polarity adding circuit is provided between an exclusive-OR circuit for detecting an absolute value of a phase difference and a low-pass filter to determine the polarity to thereby eliminate a measurement error in the vicinity of a portion where a phase difference is zero.

REFERENCES:
patent: 4712206 (1987-12-01), Kanda
patent: 4843602 (1989-06-01), McGee
patent: 5258968 (1993-11-01), Matsuda et al.

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