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APPARATUS FOR HIGH CONTRAST OPTICAL SIGNALING, AND EXEMPLARY APPLICATIONS

  • US 20130093581A1
  • Filed: 10/10/2012
  • Published: 04/18/2013
  • Est. Priority Date: 10/12/2011
  • Status: Active Grant
First Claim
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1. An optical signaling apparatus, comprising:

  • a controllable first source of illumination capable of providing ON and OFF illumination states; and

    an optical medium arranged to receive illumination from said controllable first source and capable of receiving illumination from a second source, wherein a region of said medium is arranged in such a way that a detectable optical signal is visible therefrom during an illumination ON state of said controllable first source, and wherein said region of said medium is indistinguishable from other parts of the medium during an OFF illumination state of said controllable first source, notwithstanding the arrangement of said region.

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