Optical head utilizing diffraction grating

Details Optical head utilizing diffraction grating Optical head utilizing diffraction grating

1987-06-24

1989-03-28

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 369 46, 369109, 250201, G11B 700

Patent

active

048170720

ABSTRACT:
In an optical type head device comprising a light source for emitting a light beam, a beam splitter, a condensor lens and a light detector for receiving said light beam for photoelectric conversion wherein a diffraction grating is provided to separate the light beam into a plurality of subbeams consisting of a zero-order subbeam and other subbeams so that a focussing error of the spot of the zero-order subbeam on an optical type data storing medium is detected by the fact that the light spot of the zero-order subbeam is deformed on the light detector, and a positional error of the spot of the zero-order subbeam with respect to a data track on the optical type data storing medium is detected depending on the position of the spots of the other subbeams.

REFERENCES:
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4462095 (1984-07-01), Di Chen
patent: 4665310 (1987-05-01), Heemskerk

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