| 摘要 |
The present invention concerns dichroïc mirrors also known as optical filters. In particular, rear view mirrors comprising a vitreous substrate coated with a stack of interferential layers and with a metallic reflector. The stack of layers includes, successively from the substrate, i) one layer of a high refractive index material in the range of 1.9 to 2.8, ii) one layer of a lower refractive index material in the range of 1.2 to 2, iii) one layer of semiconductor material having a refractive index of more than 3. The refractive indexes of high refractive index materials and of the low refractive index materials differ at least by 0.2, and the coated substrate has a transmittance at 550 nm of at least 6%, preferably at least 8% and a reflectance at 550 nm greater than 45%, preferably greater than 50 %. |
