Track cross signal generation circuit of optical disk device for

Details Track cross signal generation circuit of optical disk device for Track cross signal generation circuit of optical disk device for

1992-03-04

1994-02-22

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4432, 369 4429, G11B 700

Patent

active

052894479

ABSTRACT:
A track cross signal generation circuit comprises a tracking error signal generation circuit, an offset compensation circuit, a level setting circuit, and a comparator. The comparator directly receives a tracking error signal output from the tracking error signal generation circuit without passing through the offset compensation circuit and a reference level output from the level setting circuit. Further, the comparator compares the tracking error signal with the reference level, and generates a track cross signal representing the tracks formed on an optical recording medium crossed by a beam. Namely, the gain of the tracking error signal is not affected by the offset compensation circuit even within a high-speed region of the beam. Consequently, the track zero cross signal correctly indicates tracks crossed by the beam, and correctly and stably carries out a seek operation in the high-speed region of the beam.

REFERENCES:
patent: 4849953 (1989-02-01), Nomura et al.
patent: 4974220 (1990-11-01), Harada
patent: 5048002 (1991-09-01), Horie et al.
patent: 5099468 (1992-03-01), Suzuki et al.
patent: 5172355 (1992-12-01), Nakahara et al.
patent: 5189653 (1993-02-01), Yanagi

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