Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1998-12-31
2000-03-07
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 94, 369 58, 369112, 369110, G11B 700
Patent
active
060349352
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 photo-detector for receiving the beam reflected by the disc and transmitted from the beam splitter.
REFERENCES:
patent: 5157555 (1992-10-01), Reno
patent: 5235581 (1993-08-01), Miyagawa
patent: 5281797 (1994-01-01), Tatsuno et al.
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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