Recorders – Record receivers and/or driving means therefor – Laminated – impregnated – or coated bases
Patent
1978-02-24
1980-02-19
Miller, Jr., George H.
Recorders
Record receivers and/or driving means therefor
Laminated, impregnated, or coated bases
346 76L, G01D 1524, G01D 1510
Patent
active
041897358
ABSTRACT:
Playback apparatus, providing a playback beam of light, effects signal recovery, from an information record, with a high signal-to-noise ratio. An information record, suitable for use with such playback apparatus, comprises a flat major surface of a disc-shaped foundation coated with a layer of a thermally conductive material overlaid with a layer of a thermally insulating material. Information storage is effected in a layer of material (e.g., platinum-cobalt), highly absorptive for light of a frequency supplied by a recording laser, which layer overlies the insulating layer. By proper choice of thicknesses for the insulating and the conductive layers, absorptive layer sensitivity to the intensity of the playback beam of lights is effectively reduced to enable record playback at high playback beam intensity levels without damage thereto. Where the foundation is formed of a thermally conductive material, the layer of thermally conductive material may be dispensed with.
REFERENCES:
patent: 3665483 (1972-05-01), Becker et al.
patent: 4000492 (1976-12-01), Willens
patent: 4023185 (1977-05-01), Bloom et al.
patent: 4097895 (1978-06-01), Spong
patent: 4101907 (1978-07-01), Bell et al.
Bartolini Robert A.
Bell Alan E.
Shahbender Rabah
Williams Brown F.
Miller Jr. George H.
RCA Corporation
Roehling J. E.
Tripoli J. S.
Whitacre E. M.
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