Material with spectrally selective reflection

Details Material with spectrally selective reflection Material with spectrally selective reflection

2006-09-12

2006-09-12

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S585000, C359S589000, C359S359000, C359S360000

Reexamination Certificate

active

07106516

ABSTRACT:
A material with spectrally selective reflection in the primary valences of red, green and blue is applied preferably onto laser projection screens in order to make possible the projection even in daylight. In a first embodiment, a first layer of a material that is highly reflective over the entire range of visible light, e.g., aluminum is applied onto a substrate, e.g., glass or a synthetic material, followed by a second layer of a material that is essentially non-absorbing over the entire range of visible light, e.g., SiO2. A third layer in contact with air is applied to the second layer and is made of a material that is partially transmissive over the entire range of visible light, e.g., of NiCr An alternative embodiment comprise five layers, The first layer is made a material with a high index of refraction, e.g.; TiO2, a second of a material with a low index of refraction, e.g., SiO2, the third of a material with a high index of refraction, e.g., TiO2: a fourth of a material with a low index of refraction. e.g., SiO2, and a fifth layer of a material with a high index of refraction, e.g., TiO2.

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