Solid state optical disk reader

Details Solid state optical disk reader Solid state optical disk reader

1993-10-04

1994-07-12

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

385130, G11B 7085, G11B 7095

Patent

active

053295072

ABSTRACT:
A device that uses a laser beam to access data stored on an optical disk is disclosed. The laser beam is confined in a thin film optical waveguide having electrodes mounted onto the surface of the waveguide. The electrodes are arranged to form a coarse adjustment section, which adjusts the beam's direction to coincide with the data track of the optical disk to be accesses, and an electro-optic focus, which focuses the beam onto the surface of the optical disk. The electrodes are selectivity supplied with voltages from a control circuit. When the electrodes are energized, the index of refraction of the waveguide is altered, causing the beam direction and focus to be adjusted so as to coincide with and become focused onto the data track. After reflection off the data track, the beam impinges upon an array of photodetectors. The photodetectors provide a feedback signal to the control circuit which is used to continually adjust the beam direction and focus as the optical disk is read.

REFERENCES:
patent: 4460988 (1984-07-01), Gordon
patent: 4478483 (1984-10-01), Sprague
patent: 4855986 (1989-08-01), Taki
patent: 5105403 (1992-04-01), Kando et al.

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