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Disc device having a magnetic layer overweighing the information signal pattern for electronic article surveillance

  • US 5,940,362 A
  • Filed: 08/19/1996
  • Issued: 08/17/1999
  • Est. Priority Date: 08/19/1996
  • Status: Expired due to Term
First Claim
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1. A disc device comprising:

  • a substrate formed of a light transmissive material and having an information signal pattern formed on a surface thereof;

    a reflective magnetic material layer formed on the information signal pattern on the surface of said substrate; and

    a semi-hard material layer formed on said magnetic material layer, said semi-hard material layer activating and deactivating the magnetic material layer to allow for detection and non-detection, respectively, of the disc device by an electronic article surveillance detection system.

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