Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-07-22
1999-03-16
Edun, Muhammad N.
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
058838740
ABSTRACT:
An optical pickup system reads an information signal from stored on one of a first and a second optical disks alternatively to be loaded on a disk tray, wherein each of the optical disks may have a different thickness. The optical pickup system includes a light source for generating a first and a second light beams having a different wavelength from each other, a first wavelength .lambda..sub.1, and a second wavelength .lambda..sub.2, and an objective lens provided with a first and a second parts, wherein the surface of the first part is coated with a first dielectric film capable of transmitting only the first light beam emitted from the light source, whereas the surface of the second part is coated with a second dielectric film capable of transmitting only the second light beam, but totally reflecting the other light beams impinging thereon, thereby allowing the optical pickup system to detect an information signal from the respective optical disks.
REFERENCES:
patent: 5526338 (1996-06-01), Hasman et al.
Daewoo Electronics Co. Ltd.
Edun Muhammad N.
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