Patent ID: 9069129
Filing Date: 2015-06-30
Classification: B60J,E06B,G02B

Abstract:
1. An optical body comprising: a first optical layer; a second optical layer having an incident surface on which light is incident; and a reflecting layer sandwiched between the first and second optical layers, wherein at least one of the first and second optical layer is made of a resin that contains a phosphoric compound, and the reflecting layer contains an oxide, a nitride, or an oxynitride in its surface contacting with the first optical layer or the second optical layer that contains the phosphoric compound, the first optical layer includes a plurality of convex or concave structures formed on or in a surface thereof on which the reflecting layer is disposed, and the convex or concave structures are arrayed in a substantially cyclic structure pattern at a predetermined pitch, ridges of the convex structures or ridges between the concave structures adjacent to each other have tip portions projecting toward the incident surface side, the ridges have a triangular cross-section other than at the tip portions, each tip portion has a deformation defined as a radius of a larger of two circles that: the deformation of each tip portion is 7% or less of the array pitch of the structures, the second optical layer is transparent and has a refractive index of 1.1 or more and 1.9 or less, and the optical body selectively directionally reflects part of light entering the incident surface at an incident angle (θ, Φ) (where θ is an angle formed by a line perpendicular to the incident surface and incident light entering the incident surface or light reflected by the incident surface, and Φ is an angle formed between a specific line in the incident surface and a component obtained by projecting the incident light or the reflected light to the incident surface), which part is in a specific wavelength band, in a direction other than (−θ, Φ+180°).