Actuator operating center detecting circuit and optical disk app

Details Actuator operating center detecting circuit and optical disk app Actuator operating center detecting circuit and optical disk app

1983-12-15

1986-09-09

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

046113169

ABSTRACT:
A detecting circuit for detecting an operating center of an actuator of an optical head includes a first comparator for comparing a tracking signal based on a reproduced signal coming from the optical head with a reference voltage approximate to zero voltage level, and a second comparator for comparing the tracking signal of which the DC component is removed with a second reference voltage approximate to zero voltage level. A level inversion of a binary output signal of the first comparator is detected at a level inverting point of a binary output signal of the second comparator. The operating center of the actuator is checked with the detection of the level inversion.

REFERENCES:
patent: 4352981 (1982-10-01), Sugiyama et al.

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