Apparatus for reading an optical record carrier

Details Apparatus for reading an optical record carrier Apparatus for reading an optical record carrier

1982-01-18

1984-07-17

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369118, G11B 712

Patent

active

044609906

ABSTRACT:
An apparatus is described for reading an optical information structure arranged in tracks. By the use of a substantially rotationally symmetrical element having an annular radiation-attenuating peripheral portion cross-talk between the tracks as a result of obliquity of the information structure is substantially reduced.

REFERENCES:
patent: 3476457 (1969-11-01), Nomarski
patent: 3843235 (1974-10-01), Mino et al.
patent: 3913076 (1975-10-01), Lehureau et al.
patent: 4171879 (1979-10-01), Bricot et al.
patent: 4375096 (1983-02-01), Gorog et al.
Smith, Warren J., Modern Optical Engineering McGraw-Hill, New York, 1971, p. 323.

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