High-density recording optical head

Details High-density recording optical head High-density recording optical head

1991-12-30

1993-04-27

Fields, Carolyn E.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, G11B 718

Patent

active

052068528

ABSTRACT:
A high-density recording optical head for increasing recording density in an optical head for recording and reproducing information optically. The disclosed optical head is provided with an iris for transmitting or passing the central portion of the reflected light when the light reflected from a medium is transmitted by an ordinary objective lens. Another iris is also provided for transmitting or reflecting the periphery of the reflected light and, in this case, an improved objective lens structure including two inner and outer elements is provided. Therefore, in the disclosed optical head, only light reflected from the actual recording region is detected as a reproduction signal. According to the disclosed optical head, high-density recording in identical media becomes possible.

REFERENCES:
patent: 4110607 (1978-08-01), Honjo et al.
patent: 4811328 (1989-03-01), Ito et al.
patent: 5025438 (1991-06-01), Emoto
patent: 5072437 (1991-12-01), Chikuma
patent: 5105410 (1992-04-01), Maeda et al.
patent: 5155718 (1992-10-01), Hashimoto et al.

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