Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1991-03-01
1992-09-01
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4412, 369109, 369112, G11B 700
Patent
active
051446030
ABSTRACT:
An optical head using a refractive index distribution changeable lens by which light focused on a recording surface of an optical disc is precisely and positionally controlled. The refractive index distribution of this refractive index distribution changeable lens is changed by changing an electric field applied thereto so as to precisely displace the position of the focus point of the emitted light on the recording surface of the optical disc.
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Mozume Teruo
Ohbu Isao
Envall Jr. Roy N.
Hitachi , Ltd.
Tran Thang V.
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