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Method and apparatus for bistable optical information storage for erasable optical disks

  • US 4,965,784 A
  • Filed: 05/31/1988
  • Issued: 10/23/1990
  • Est. Priority Date: 05/31/1988
  • Status: Expired due to Fees
First Claim
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1. A method of bistable storage of optical information, which comprises:

  • providing a material capable of shifting between stable first antiferroelectric and second ferroelectric phases by applying at least one of electric energy and illumination energy thereto,applying an electrical field across a surface of the material, so that the material shifts from the first phase to the second phase,illuminating parts of the material, thereby causing the illuminated parts to shift back to the first phase,removing the illumination and electrical field so that the illuminated parts remain in the first phase and the unilluminated parts remain in the second phase, anddirecting a read light beam onto the portion of the material and determining the first and second phase parts thereof.

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