Optical head apparatus for focussing a minute light beam spot on

Details Optical head apparatus for focussing a minute light beam spot on Optical head apparatus for focussing a minute light beam spot on

1989-06-14

1992-06-09

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, 369 4412, G11B 718

Patent

active

051213788

ABSTRACT:
In an optical head apparatus, a minute light beam spot is formed on a recording medium by a focusing lens. The focusing lens focuses light radiated from a light source to provide the minute light beam spot. Between the light source and the focusing lens, a light intensity or phase distribution converter is provided, so that the minute light beam spot will be a super resolved light beam spot.

REFERENCES:
patent: 4339177 (1982-07-01), March
patent: 4682315 (1987-07-01), Uejima
patent: 4766585 (1988-10-01), Fukumoto
patent: 4811328 (1989-03-01), Ito et al.
patent: 4893008 (1990-01-01), Horikawa

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