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Optical device having low visual light transmission and low visual light reflection

  • US RE36,308 E
  • Filed: 06/02/1998
  • Issued: 09/21/1999
  • Est. Priority Date: 11/01/1994
  • Status: Expired due to Term
First Claim
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1. A solar control film having low visible light transmittance and low visible light reflectance comprising . ...!.a first sheet of transparent substrate material having thereon a thin, incoherent, transparent film of metal effective to partially block visible light transmittance and having a preselected low visible light reflectance,a second sheet of transparent substrate material having thereon a thin, incoherent, transparent film of metal effective to partially block visible light transmittance and having a preselected low visible light reflectance, anda layer of adhesive bonding said first and second sheets to one another with the films of metal facing one another and separated and optically decoupled from one another,the bonded sheets forming a composite film having a combined visible light transmittance blocking effect equal approximately to the sum of the blocking effects of the incoherent films and visible light reflectance substantially equal to the visible light reflectance of just one of the incoherent films, the visible light reflectance of each incoherent film being such that the visible light reflectance of the composite film .Iadd.on clear glass .Iaddend.does not exceed about 12% when visible light transmittance is .Iadd.within the range of from about 35% up to .Iaddend.about 50% . .or less.!., .Iadd.and .Iaddend.does not exceed about 15% when visible light transmittance is about 35% or less . .and does not exceed about 20% when visible light transmittance is about 25% or less.!..

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