DICHROIC MIRROR
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United States of America Patent
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Issued Date -
Mar 5, 2009
app pub date -
Oct 27, 2005
filing date -
Oct 29, 2004
priority date (Note) -
Abandoned
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Abstract
Dichroïc mirrors, also known as optical filters, having a particular use as a rear view mirror includes a vitreous substrate coated with a stack of interferential layers and with a metallic reflector. The stack of layers includes, successively from the substrate, a layer of high refractive index material in the range of 1.9 to 2.8, a layer of a lower refractive index material in the range of 1.2 to 2.2, and a layer of a semiconductor material having a refractive index of more than 3. The refractive indices of the layers of high refractive index material and lower refractive index material differ by at least 0.2 and the coated substrate has a transmittance at 550 nm of at least 6% and a reflectance at 550 nm greater than 45%.
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