Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Having layered storage medium
Patent
1996-02-21
1998-07-07
Edun, Muhammad N.
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
Having layered storage medium
369 59, 369 58, 369 48, G11B 700
Patent
active
057779708
ABSTRACT:
An optical disc readout apparatus is disclosured. The apparatus adjusts an optical system which leads the laser beam output from the laser diode to the objective according to the board thickness of the optical disc, and focuses the laser beam onto the information-bearing surface of the disc by the collaboration of the adjusted optical system with the objective. The adjustment can be achieved by, for example, advancing the correction lens to the optical path of the optical system or retreating the correction lens from such optical path. An another apparatus is disclosured. The another apparatus is provided with a first optical system which leads the laser beam output from the first laser diode to the common optical system and a second optical system which leads the laser beam output from the second laser diode to the common optical system. Either the first optical system or the second optical system includes a correction lens. One of the systems is selected according to a type of the loaded disc. Both the first optical system and the second optical system can focus the laser beam onto the information-bearing surface of the disc.
REFERENCES:
patent: 5408453 (1995-04-01), Holtslag et al.
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patent: 5499231 (1996-03-01), Fennema et al.
patent: 5526336 (1996-06-01), Park et al.
DVD/CD, Nikkei Mechanical 1995, 8.7 No. 460.
K. Nakamura, et al. "Development of Twin Lens Optical Pick-Up for DVD".
Dual focus optical head for 0.6mm and 1.2m disks (II).
Phase change optical disks using thin subtrate.
Hibino Katsutoshi
Ichiura Shuichi
Kajiyama Seiji
Toyama Tateo
Tsuchiya Yoichi
Edun Muhammad N.
Sanyo Electric Co,. Ltd.
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