| 摘要 |
The invention relates to a material with spectrally selective reflection in the primary valences of red, green and blue. This material 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, which is followed by a second layer of a material that is essentially non-absorbing over the entire range of visible light, e.g., SiO2, on which, in turn, a third layer f a material that is partially transmissive over the entire range of visible light, e.g., of NiCr is disposed. The latter is in contact with air. An alternative embodiment comprises five layers, of which a first is comprised of 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. In this embodiment, the first layer is here connected with the substrate, while the fifth layer is in contact with air.
|
