Focusing control apparatus using dynamic target value in relatio

Details Focusing control apparatus using dynamic target value in relatio Focusing control apparatus using dynamic target value in relatio

1995-03-30

1998-03-24

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4426, 369 4429, 369 4435, G11B 700

Patent

active

057320519

ABSTRACT:
A focusing control apparatus is provided for controlling focusing of a light beam on a recording medium. The apparatus includes a control mechanism for maintaining the focusing state of the light beam on the recording medium by moving a focus mechanism based on a comparison between an output signal indicative of the focusing state and a target value. The apparatus further includes a target value setting circuit for setting the target value at a first level when the light beam is irradiated on the land track portions of the recording medium; and for setting the target value at a second level when the light beam is irradiated on the groove track portions.

REFERENCES:
patent: 5138594 (1992-08-01), Fennema
Abstract for Japanese Pat. No. 3-130937, Jun. 4, 1991.
Abstract for Japanese Pat. No. 4-38633, Feb. 7, 1992.

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