Patent ID: 7821717
Filing Date: 2010-10-26
Classification: G02B,G03B

Abstract:
1. A lens element comprising: a rear substrate having a front surface provided with a surface relief having a plurality of zones each capable of providing a lens effect; a front substrate disposed in front of the rear substrate and having a rear surface provided with a surface relief having a plurality of zones each capable of providing a lens effect, the zones of the surface relief provided on the rear substrate and the front substrate having the same spatial arrangement over the area of the lens element such that the zones of the surface relief provided on the rear substrate and the front substrate have an equivalent lens effect, wherein the surface relief of the rear substrate and the surface relief of the front subject are convex lens surface; and solid or liquid, isotropic, intermediate material disposed between the front surface of the rear substrate and the rear surface of the front substrate, the intermediate material having a refractive index lower than the refractive index of each of the rear substrate and the front substrate.