Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-12-26
1997-05-06
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 94, 369 4437, G11B 700
Patent
active
056278144
ABSTRACT:
An optical pickup system for reproducing an information signal stored on an optical disk, including a pair of recording surfaces thereon, is provided with a pair of light sources for generating a first and a second light beams having different wavelength, .lambda..sub.1, .lambda..sub.2, a detector, an objective lens, a signal detection unit and a beam splitter having a first and a second surfaces, wherein the first surface of the beam splitter is pervious to the light beam having a wavelength other than .lambda..sub.1 and the second surface of the beam splitter is pervious to the light beam having a wavelength other than .lambda..sub.2. In the system, while the first light source is used for reproducing the information signal off the first recording surface of the optical disk, the first light beam transmitted from the second surface of the beam splitter is used for detecting the focusing error signal of the first recording surface of the optical disk. When the second light source is used for detecting the focusing error signal of the second recording surface of the optical disk, the second light beam reflected from the second surface of the beam splitter is utilized for reproducing the information signal off the second recording surface with the first light source turned off.
REFERENCES:
patent: 5150347 (1992-09-01), Yanagi
patent: 5161243 (1992-11-01), Ishida et al.
patent: 5251198 (1993-10-01), Strickler
patent: 5295125 (1994-03-01), Oonishi et al.
patent: 5341355 (1994-08-01), Gotoh et al.
patent: 5487058 (1996-01-01), Kitabayashi
Ben Loha
Daewoo Electronics Co. Ltd.
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