Photodisc apparatus with means for canceling offset of tracking

Details Photodisc apparatus with means for canceling offset of tracking Photodisc apparatus with means for canceling offset of tracking

1990-04-26

1991-09-10

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4436, G11B 7095

Patent

active

050480022

ABSTRACT:
A servo tracking system enables a beam spot formed on a photodisc through an objective lens to trace a track on the disc. After opening the tracking servo loop, a drive signal is supplied to a lens actuator so as to move the objective lens across the tracks thereby generating a tracking error signal. The tracking error signal is sampled for detection of the central value of the same. An offset control is conducted so as to make the central value of the tracking error signal fall within an allowable standard range.

REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 4878211 (1989-10-01), Suzuki et al.

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