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Transmissively read quad density optical data system

  • US 4,786,792 A
  • Filed: 10/31/1986
  • Issued: 11/22/1988
  • Est. Priority Date: 10/12/1983
  • Status: Expired due to Term
First Claim
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1. An optical data storage and retrieval system comprising,an optical data storage medium having optically readable digital data encoded by microscopic spots in specified data cell positions on said medium thereby changing transmissivity of the medium, said data cell positions forming a grid with perpendicular, contiguous yet non-overlapping rows and columns of cell positions, said columns aligned with the length of said medium, anda linear CCD array aligned perpendicular to said columns of cell positions on a side of said medium opposite a light source, said array having a plurality of fixed position detector cells imaging each specified data cell position in a row of cells, wherein at least two detector cells image a specified data cell position, with groups of detector cells simultaneously imaging a plurality of cell positions.

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