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Process for recording low-frequency wide-band signals on a thermoplastic storage medium

  • US 4,015,248 A
  • Filed: 03/17/1976
  • Issued: 03/29/1977
  • Est. Priority Date: 11/07/1973
  • Status: Expired due to Term
First Claim
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1. In a process for recording low-frequency, wide-band signals on a thermoplastic storage medium having a resonance frequency considerably higher than the frequency of the signal being recorded and particularly adapted for recording electrical interference signals of sonar holograms on the storage medium, which process includes providing a thermoplastic storage medium on a transparent photoconducting carrier, sensitizing the thermoplastic material by applying a charge of uniform distribution to a surface thereof, converting the electrical signals of information to be recorded with an electro-optical transducer into optical signals, exposing the thermoplastic medium with the optical signals to create a charge profile corresponding to the optical signals and developing the exposed storage medium by heating the medium to at least a softening point so that a surface relief corresponding to the charge profile is formed in the surface, the improvement comprising imposing a lattice signal on the storage medium prior to developing the storage medium, so that the sum or difference of the frequencies of the optical signals and the lattice signal correspond to the resonance frequency of the storage medium.

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