Optical record carrier and apparatus for reading it

Details Optical record carrier and apparatus for reading it Optical record carrier and apparatus for reading it

1979-10-22

1982-04-13

Wolff, John H.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

358 5, 3581286, 369 47, 369 94, 369109, 369111, 369112, 369118, 369122, 369275, G11B 700

Patent

active

043251358

ABSTRACT:
A record carrier is disclosed having an optically readable information structure comprising trackwise arranged information areas, as well as an apparatus for reading said record carrier. By using two mutually perpendicularly polarized beams components for reading and by giving the information areas of adjacent track portions a different geometries such that areas of one geometry can be read in an optimum manner by only one of the beam components and is virtually not observed by the other beam component, the track distance can be reduced without increasing the crosstalk, so that the information content of the record carrier is increased.

REFERENCES:
patent: 3314052 (1967-04-01), Lohmann
patent: 3348217 (1967-10-01), Snaper
patent: 3855426 (1974-12-01), Bouwhuis
patent: 4084185 (1978-04-01), de Lang et al.
patent: 4161752 (1979-07-01), Basilico
patent: 4167024 (1979-09-01), Hamisch
patent: 4209793 (1980-06-01), Ueno
patent: 4209804 (1980-06-01), Dil

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