Apparatus and method for quickly focusing an optical disk player

Details Apparatus and method for quickly focusing an optical disk player Apparatus and method for quickly focusing an optical disk player

1996-08-05

1998-04-28

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, G11B 7095

Patent

active

057454523

ABSTRACT:
An apparatus and method for approaching a focusing region are provided. The apparatus for approaching the focusing region includes a focus error detector, a signal envelope detector, a focusing region detector, a pulse generator for generating search pulses, a time counter, an offset generator, an adder, an actuator driver and a controller. The apparatus approaches the focusing region based on the generating search pulses, which are output in response to a signal generated by the signal envelope detector and a signal output by the focusing region detector. When a subsequent approach to the focusing region is made after finishing a first approach to the focusing region, the actuator is controlled by adding the search pulses to an offset voltage calculated when the first approach to the focusing region was performed to quickly position the object lens in the focusing region.

REFERENCES:
patent: 5629912 (1997-05-01), Okawa et al.
patent: 5642340 (1997-06-01), Nomura

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