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CARD-CHANGEABLE CAPACITOR READ-ONLY MEMORY

  • US 3,593,319 A
  • Filed: 12/23/1968
  • Issued: 07/13/1971
  • Est. Priority Date: 12/23/1968
  • Status: Expired due to Term
First Claim
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1. A read-only capacitive memory comprising a. A read matrix characterized by an insulating layer, a first plurality of parallel conductors extending across and completely underlying said insulating layer, a second plurality of parallel conductors extending across and completely overlying said insulating layer, said first conductors being orthogonal to said second conductors to form a matrix having a multiplicity of crossover areas common to said first and second plurality of conductors, said first and second plurality of parallel conductors forming an irregular surface on said insulating layer;

  • b. A storage medium for encoding the matrix, said storage medium being characterized by areas of a relatively high conductivity material representative of information of a first magnitude and areas of a relatively low conductivity material representative of information of a second magnitude, said storage medium being flexible and conforming in a complementary fashion to the irregular surface of said read matrix for encoding said matrix by being so positioned in close proximity thereto that each information area of said storage medium is registered with the crossover areas of said conductors forming the matrix and extends beyond at least one edge the crossover areas to capacitively couple the first and second conductors common to the crossover area;

    c. Means for selectively driving at least one conductor forming the matrix; and

    d. Means for detecting the electrical signal capacitively coupled from said driven conductor to an orthogonally disposed conductor.

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