Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1979-01-26
1984-05-22
Faber, Alan
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 94, 369286, 369288, 3461351, G11B 724
Patent
active
044505531
ABSTRACT:
The invention relates to a multilayer information disc, in particular a video disc, which is read by laser light. The disc comprises at least two radiation-reflecting optical structures each having a relief-like information track of regions situated alternately at a higher and a lower level which is read in reflection and on the basis of phase differences. Each of the optical structures is covered with a reflection layer at least one of which partially transmits the reading radiation so that upon reading the other optical structure or structures, the radiation passes through the structure provided with the partially transmitting reflection layer. The coefficients of reflection of the various reflective layers are preferably matched to each other in a manner such that upon reading the same amount of light returns from each optical structure. A suitable material for the partially reflective layer is a dielectric which has no light absorption.
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patent: 3855426 (1974-12-01), Bouwhuis
patent: 3894179 (1975-07-01), Jacobs
patent: 3999009 (1976-12-01), Bouwhuis
patent: 4020278 (1977-04-01), Corre
patent: 4069487 (1978-01-01), Kasai
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"Notes on Solution of Problems in Odd Job Vapor Coating", by Bond, p. 429, vol. 44, No. 6, Jun. 1954, Journal of the Optical Society of America.
Holster Peter L.
Wittkamper Johannes M.
Briody Thomas A.
Faber Alan
Mayer Robert T.
Tamoshunas Algy
U.S. Philips Corporation
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