Patent ID: 8305688

Claim:
An article comprising: a substrate; and a metal dielectric reflective film formed on the substrate, the reflection wavelength with reflectivity over 30% of the metal dielectric reflective film being in the range from about 370 nm to about 520 nm; the metal dielectric reflective film consisting of: a dielectric multiple layer consisting of a first layer, a second layer, a third layer, and a fourth layer arranged in the order written and stacked one on another, the first and third layers comprised of a low refractive index material, the second and fourth layers comprised of a high refractive index material; wherein the refractive index of the low refractive index material is in the range from about 1.63 to about 1.68, and the refractive index of the high refractive index material is in the range from about 1.76 to about 1.87; and a metal layer disposed on the fourth layer.