Optical disc write/read employing passive focus maintenance

Details Optical disc write/read employing passive focus maintenance Optical disc write/read employing passive focus maintenance

1982-06-28

1985-07-16

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369111, 369261, G11B 712

Patent

active

045300828

ABSTRACT:
The quality of spot-focus of optical writing and reading light upon the information surface of a flexible optical disc is passively enhanced by (1) rotating the disc with its neutral plane stabilized in space and (2) directing such light through the optical disc support into precise spot-focus on the information surface. With this technique spherical aberration induced by the disc support compensates for thickness variation of the support. Various structural embodiments are disclosed.

REFERENCES:
patent: 2554679 (1951-05-01), Mitchell
patent: 3950621 (1976-04-01), Bouwhuis
patent: 4039764 (1977-08-01), Bricot et al.

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