Light protection apparatus comprising an electrically controllable light protection filter element

  • US 5,302,815 A
  • Filed: 08/27/1992
  • Issued: 04/12/1994
  • Est. Priority Date: 01/10/1992
  • Status: Expired due to Term
First Claim
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1. A light protection apparatus, particularly for welder'"'"'s protective helmets, welder'"'"'s protective eyeglasses or welder'"'"'s protective shields, comprising a light protection filter element, the optical transmission thereof being electrically controllable, a control means connected to said light protection filter element to control the optical transmission of said light protection filter element, said control means comprising a plurality of light sensitive sensor means to control the light transmission of said light protection filter element in dependence of the light falling onto said sensor means, said light protection filter element being provided with shield means adapted to shield each of said sensor means against interfering light falling onto said sensor means in at least one preselected direction.

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