Optical head with optical beam control using acoustic wave devic

Details Optical head with optical beam control using acoustic wave devic Optical head with optical beam control using acoustic wave devic

1987-09-09

1989-08-29

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

250201, 369112, G11B 700

Patent

active

048624403

ABSTRACT:
An optical head is disclosed, in which a plate-shaped optical wave guide comprises an optical system including a collimator lens, a beam splitter and an objective lens; a laser light source for emitting a laser light in the form of a light beam which is to be impinged on an optical recording medium; and electro-acoustic transducers are disposed between the beam splitter and the objective lens, the transducers being adapted to be driven by the outer electrical signal for producing surface acoustic waves in the optical wave guide, thereby establishing a condensation and rarefaction distribution in refractive index in the optical wave guide which distribution influences the direction of transmission and the degree of focusing of the light beam passing therethrough so that regulation of the tracking and the focal length can be effected without any mechanical movements.

REFERENCES:
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4720824 (1988-01-01), Hayashi
patent: 4747090 (1988-05-01), Yamashita et al.
patent: 4760568 (1988-07-01), Hine
patent: 4779259 (1988-10-01), Kono et al.

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