Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-10-17
1997-12-30
Huber, P. W.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369112, G11B 700
Patent
active
057038562
ABSTRACT:
An optical head for reproducing data from first and second optical disks which are different from each other in at least one of a base material thickness and an available wavelength, includes: a first light source for emitting a first light beam, the first light beam being used for reproducing data from the first optical disk: an optical system designed to converge the first light beam onto the first optical disk in accordance with a base material thickness and an available wavelength of the first optical disk: and a second light source for emitting a second light beam, the second light beam being used for reproducing data from the second optical disk, wherein an optical path length between the second light source and the optical system is different from an optical path length between the first light source and the optical system, and wherein the optical system converges the second light beam onto the second optical disk.
REFERENCES:
patent: 4908813 (1990-03-01), Ojima et al.
patent: 5446565 (1995-08-01), Komma et al.
Hayashi Hideki
Ito Noboru
Komma Yoshiaki
Mizuno Sadao
Urairi Kenichiro
Huber P. W.
Matsushita Electric - Industrial Co., Ltd.
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