Optical disc pressure-collapsible cover

Details Optical disc pressure-collapsible cover Optical disc pressure-collapsible cover

1983-04-15

1985-04-09

Goldberg, E. A.

Recorders

Record receivers and/or driving means therefor

Laminated, impregnated, or coated bases

346137, 369284, 369287, 369275, G01D 1534, G11B 724

Patent

active

045105081

ABSTRACT:
An optically readable storage disc comprises a transparent substrate 1 on which a recording layer 2 is deposited which can be modified locally by means of a radiation beam, which recording layer is covered by a cover disc 3 which is secured to the substrate in a gas-tight manner at some distance from the part of the recording layer which is intended for recording, so that a sealed space 4 is enclosed between the substrate 1 and the cover disc 3. The cover disc 3 will be deformed to the greatest extent under the influence of differences between the gas pressure in the sealed space 4 and the barometric pressure because its resistance to deformation is substantially smaller, so that deformation of the substrate 1 is substantially precluded.

REFERENCES:
patent: 4365257 (1982-12-01), Gerfast
patent: 4365258 (1982-12-01), Geyer et al.
patent: 4380016 (1983-04-01), Lehureau et al.

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