Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1998-05-04
2000-05-23
Dinh, Tan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, 369 4437, 369 94, 369109, G02B 526, G02B 518, G11B 7135
Patent
active
060672838
ABSTRACT:
An optical pickup is provided for reproducing information recorded on optical recording mediums including a first recording medium having a predetermined first distance from a surface of the medium to an information recording surface, and a second recording medium having a predetermined second distance different from the first distance. A first light source is provided for emitting a first light beam having a first wavelength, and a second light source is provided for emitting a second light beam having a second wavelength. An objective focuses the first light beam on the information recording surface of the first recording medium, and focuses the second light beam on the information recording surface of the second recording medium. A correction means is provided in an optical path between the first and second light sources and the objective for correcting aberrations generated in the second light beam.
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Chu Kim-Kwok
Dinh Tan
Pioneer Electronics Corporation
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