Optical head device

Details Optical head device Optical head device

1988-10-05

1991-01-08

Arnold, Bruce Y.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

35016217, 3501622, 369 4411, 369109, G02B 518, G11B 700

Patent

active

049830023

ABSTRACT:
An optical head device which consists of a semiconductor laser for emitting a light flux, a plano-parallel optical element operable to diffract the light flux into a zero-order diffracted light beam and a plurality of diffracted light beams, a condenser lens for converging the diffracted light beams on an information bearing surface of an optical disc to form respective light spots thereon, and a photo-electric detector assembly adapted to receive, and convert into electric signals, the light beams which have been reflected from the information bearing surface of the optical disc and then passed through the optical element via the condenser lens. The plano-parallel optical element of unique construction which is employed is effective to reduce the ratio of intensity of the positive and negative first-order transmitted and diffracted light beams relative to the intensity of the zero-order transmitted and diffracted light beam to a considerably small value and also to provide a favorable tracking sensor output characteristic.

REFERENCES:
patent: 4481620 (1984-11-01), Murakami
patent: 4501439 (1985-02-01), Antes
patent: 4753513 (1988-06-01), Shikama
patent: 4817072 (1989-03-01), Toide et al.

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