Recorders – Record receivers and/or driving means therefor – Laminated – impregnated – or coated bases
Patent
1974-11-25
1976-11-02
Hartary, Joseph W.
Recorders
Record receivers and/or driving means therefor
Laminated, impregnated, or coated bases
346 76L, 427 53, 427250, G01D 1534
Patent
active
039900843
ABSTRACT:
An article for the recording and storage of information includes a support and a layer for storing information provided on the support. The layer is amorphous and composed of a mixture which includes an element of the group bismuth, antimony and selenium and a different element of the group selenium and tellurium. Information may be recorded on the layer by burning away selected regions thereof with high-energy radiation such as a laser beam. A preferred mixture includes bismuth and selenium with the weight ratio of bismuth to selenium being between about 1:2.5 and 1:3.5 for radiation having a wavelength corresponding to visible blue light and with the proportion of selenium being increased for longer wavelengths such as those corresponding to visible green and red light. The layer has a thickness which corresponds to a fraction of the wavelength of the radiation used for recording and the layer is optically opaque. A coating of lacquer may be applied over the layer prior to and/or subsequent to the recording operation so as to protect the layer. The layer is advantageously formed by vapor-depositing the elements selected from the above-mentioned groups onto the support simultaneously.
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patent: 3911444 (1975-10-01), Lou et al.
Hamisch Hansjoachim
Kaiser Hans-Jurgen
Hartary Joseph W.
Robert Bosch G.m.b.H.
Striker Michael J.
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