Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-12-04
2000-02-15
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
50 58, 50 4423, G11B 700
Patent
active
060260653
ABSTRACT:
An improved optical pick-up apparatus capable of reading data irrespective of disc type capable of reading various kinds of discs having different thicknesses and writing densities using only one pick-up apparatus, which includes a light source; a beam splitter for passing through or splitting a beam from the light source; an objective lens for condensing the beam onto corresponding disc among discs having different thicknesses and different densities; a numerical aperture control unit for controlling an effective numerical aperture of the objective lens so as to execute a focussing operation with respect to a certain disc; and a photodetector for receiving the beam reflected by the disc and transmitted from the beam splitter.
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Kim Dae-Young
Kim Jin-Yong
Lee Man-Hyung
Park Song-Chan
Song In-Sang
LG Electronics Inc.
Tran Thang V.
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