Patent ID: 8477414
Filing Date: 2013-07-02
Classification: B32B,C03C,G02B,Y10T

Abstract:
1. An optical element comprising: a first optical layer having a light emission surface; a wavelength-selective reflective layer provided on the first optical layer; and a second optical layer provided on the wavelength-selective reflective layer and having a light incidence surface, wherein the wavelength-selective reflective layer has a structure including at least five layers in which high refractive-index layers and metal layers are alternately laminated to each other, when a geometric film thickness L of the entire wavelength-selective reflective layer is 80 nm, a ratio α of an optical film thickness of the entire metal layers to an optical film thickness of the entire high refractive-index layers and a ratio β of an optical film thickness of a third high refractive-index layer from one of a first optical layer side and a second optical layer side to an optical film thickness of a first high refractive-index layer therefrom are included in a first region surrounded by the following formulas (1) to (4), when the geometric film thickness L of the entire wavelength-selective reflective layer is 90 nm, the ratio α and the ratio β are included in a second region surrounded by the following formulas (5) to (8), and when the geometric film thickness L of the entire wavelength-selective reflective layer is in a range of 80 to 90 nm, the ratio α and the ratio β are included in a space enclosed by the first region, the second region, and the following formulas (9) to (12)