Patent ID: 7564628

Claim:
A multiple band visible light reflector, comprising: a substrate; a stack disposed on said substrate or on one or more intervening layers that are disposed on said substrate, wherein said stack comprises: a first metal layer disposed in contact with said substrate; a first dielectric layer disposed in contact with said first metal layer; a second metal layer disposed in contact with said first dielectric layer; a second dielectric layer disposed in contact with said second metal layer; a third metal layer disposed in contact with said second dielectric layer; a third dielectric layer disposed in contact with said third metal layer; a fourth metal layer disposed in contact with said third dielectric layer; and, a fourth dielectric layer disposed in contact with said fourth metal layer; wherein said first dielectric layer and said second dielectric layer have a difference in thickness of at least 6 percent optical thickness; wherein each of said first dielectric layer, said second dielectric layer, said third dielectric layer, and said fourth dielectric layer has a thickness of 40 to 100 nanometers; wherein said reflector reflects light over the visible spectrum in at least two reflection peaks, wherein the intensity of each reflection peak is at least 45% of incident light at the same wavelength as said each reflection peak and the intensity of valleys between said reflection peaks are no more than 50% of the average intensities of said reflection peaks; and, wherein said stack has a thickness of less than 0.5 microns.