Optical recording and reproducing head

Details Optical recording and reproducing head Optical recording and reproducing head

1985-09-09

1987-08-25

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369111, 369110, 369 46, 350286, 350402, G11B 7095, G11B 7135

Patent

active

046897801

ABSTRACT:
A light beam emitted from a semiconductor laser passes through optical elements which include a condenser lens, a magnifier prism, and a focussing lens to obtain a substantially circular spot of light on a disc. The magnifier prism is constructed such that only the narrower cross-section of the elliptical light beam emitted from the condenser lens is magnified by the incidence surface of the magnifier prism to obtain a substantially circular light beam. The light beam thus obtained is reflected by the prism so that it becomes substantially perpendicular to the beam emitted from the condenser lens. After reflection by the disc, the light passes through a splitter prism. The splitter prism has a reflecting surface and a transmitting surface which spatially bisect the light beam reflected from the disc, a lens and other components. The bisected portions of the beam fall on a photodetector for focussing control and a photodetector for tracking control.

REFERENCES:
patent: 4429378 (1984-01-01), Sato
patent: 4505584 (1985-03-01), Kato
patent: 4542492 (1985-09-01), Leterme
patent: 4573149 (1986-02-01), Deguchi
"Integrated Autofocusing System and Method of Manufacture", by Gaston, IBM Tech. Disc. Bull., vol. 23, No. 5, Oct. 1980, pp. 1906-1908.

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