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Code-based, electromagnetic-field-responsive graphic data-acquisition system

  • US 5,248,856 A
  • Filed: 10/07/1992
  • Issued: 09/28/1993
  • Est. Priority Date: 10/07/1992
  • Status: Expired due to Term
First Claim
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1. A graphic data-acquisition system for noting the character, and for tracking the positional status, relative to a defined writing-surface area, of a mobile write-effective component in the system comprisingscanning light-beam-source structure disposed adjacent such writing-surface area and operable to create a defined pattern of scanned light within and covering a scanning zone spaced closely adjacent and generally spanning the writing-surface area,light-retroreflecting, selected-characteristic-identifying code structure joined to the mobile component for the retroreflection of light impinging the code structure within said scanning zone, including the retroreflection of encoded, characteristic-identifying informationlight-retroreflection monitoring structure positioned adjacent the writing-surface area for receiving such retroreflection, and for producing a signal related thereto, andinterpretation structure operatively connected to said monitoring structure for acquiring and interpreting positional and component-characteristic-identifying information from such a produced signal.

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