Track cross signal generation circuit of optical disk device for

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

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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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