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Pen and paper information recording system

  • US 5,652,412 A
  • Filed: 07/11/1994
  • Issued: 07/29/1997
  • Est. Priority Date: 07/11/1994
  • Status: Expired due to Term
First Claim
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1. Information recording apparatus for use with an encoded writing surface having a prerecorded pattern of pixels, each of said pixels containing optically readable absolute position information which identifies the location of the pixel on said writing surface, said apparatus comprising:

  • a pen having a tip and including means for making visible markings on said writing surface and means for detecting the position of said tip on said writing surface by optically reading the pixels and obtaining said absolute position information when said tip is in contact with said surface and visible markings are made on said writing surface, said means for detecting the position of said tip including means for transmitting a light beam to said pattern of pixels and means for detecting reflected light from said pattern of pixels, said means for transmitting comprising a plurality of light emitting diodes, wherein said light emitting diodes have different transmission wavelengths and are energized sequentially; and

    a recording unit coupled to said pen and responsive to the absolute position information read by said detecting means for electronically recording the position of the tip of said pen on said writing surface as the visible markings are made on said writing surface so that said recording unit contains an electronic representation of the visible markings on said writing surface.

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