Focusing servo apparatus for an optical disc

Details Focusing servo apparatus for an optical disc Focusing servo apparatus for an optical disc

1992-04-08

1993-12-07

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4435, 2502015, G11B 709

Patent

active

052688887

ABSTRACT:
The present invention is directed to apparatus. Upon actuation, a system controller controls a digital-to-analog converter to derive a pulse-shaped wave sweep signal. This sweep signal is supplied through an adder and a driver to a focusing actuator, and the focusing actuator drives an objective lens of an optical pickup in response to the sweep signal. According to the focusing servo apparatus of the invention, the focusing servo can be locked in smoothly.

REFERENCES:
patent: 5128913 (1992-07-01), Fennema et al.

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