Optical head incorporating refractive index distribution changea

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

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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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