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Remote data transfer system with ambient light insensitive circuitry

  • US 5,134,277 A
  • Filed: 09/05/1990
  • Issued: 07/28/1992
  • Est. Priority Date: 11/07/1983
  • Status: Expired due to Fees
First Claim
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1. A responder for performing an operation in response to a light beam directed towards and impinging upon the responder, said light beam having a primary sharp light intensity change, the responder including:

  • a light collector, the light collector being arranged to receive incident light impinging thereon, said light collector comprising a housing having a receiving face onto which said incident light impinges, said incident light passing through the receiving face, the light collector further including a light detector, the light detector having a light detecting portion located within said housing and arranged so that said light detecting portion receives incident light without said light collector causing imaging on said light detecting portion of light sources producing said incident light, said light detector generating detector signals in response to incident light impinging on said light detecting portion, the light collector further including light scattering means located within said housing and arranged to scatter light passing through the receiving face into the housing whereby incident light passing through the receiving face is scattered by said light scattering means and a proportion of said scattered light is directed towards and is incident upon said light detecting portion of said light detector, said proportion of said scattered light consisting of an average of the total light impinging on said receiving face,an electronic distinguishing circuit connected to said light detector to receive said detector signals and operative to distinguish between detector signals produced by ambient light and by said light beam, said distinguishing circuit being operative to generate an indicative output when said sharp light intensity change is received and detected by said light detector, andan operational circuit responsive to said indicative output of said electronic distinguishing circuit and operative to perform said operation in response to said indicative output.

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