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Optical disc pressure-collapsible cover

  • US 4,510,508 A
  • Filed: 04/15/1983
  • Issued: 04/09/1985
  • Est. Priority Date: 02/09/1983
  • Status: Expired due to Term
First Claim
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1. An optically readable information storage disc comprising a transparent disc-shaped substrate, a recording layer disposed on the substrate, said layer being locally modifiable by a beam of radiation, and a cover disc secured to said substrate in a substantially gas-tight manner and having a portion which is spaced from at least that part of said recording layer on which information is to be recorded so as to form a sealed space therebetween, said cover disc being sufficiently flexible so that its resistance to deformations due to differences between gas pressure in said sealed space and ambient barometric pressure is substantially lower than that of said substrate so as to reduce deformations of said substrate due to said pressure differences.

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