Beam spot control device using a thin micro lens with an actuato

Details Beam spot control device using a thin micro lens with an actuato Beam spot control device using a thin micro lens with an actuato

1985-10-11

1988-10-04

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369112, 250201, G11B 700

Patent

active

047759674

ABSTRACT:
In the present invention, a micro Fresnel lens in the shape of a thin film is used. A lens driving member constructed of piezoelectric transducers or of magnets and coils is disposed around the lens. The focus of the lens is adjusted by controlling applied voltages to the piezoelectric transducers or the coils.

REFERENCES:
patent: 3668404 (1972-06-01), Lehovec
patent: 4342935 (1982-08-01), Kallmeyer et al.
patent: 4385373 (1983-05-01), Howe
patent: 4425023 (1984-01-01), Matsumoto et al.
patent: 4441175 (1984-04-01), Shuman

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