Optical body, optical body manufacturing method, solar shading member, window member, interior member, and fitting

An optical body manufacturing method comprising:

• transferring a concave-convex shape of a mold or a die to a first resin material, thereby forming a first optical layer which includes a plurality of convex or concave structures formed on or in one principal surface thereof and arrayed in a substantially cyclic structure pattern at a predetermined pitch;
• forming a reflecting layer on the concave-convex surface that has been transferred to the first optical layer;
• and
• embedding the reflecting layer with a second resin material, thereby forming a second optical layer having an incident surface on which light is incident, the second optical layer being transparent and having a refractive index of 1.1 or more and 1.9 or less,
• 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,
• 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:
• intersect an end of the tip portion,
• are on opposite sides of the tip portion, and
• intersect at a single point with each of two sides a triangle formed by the triangular cross-section of a portion of the ridge outside the tip portion,
• the deformation of each tip portion is 7% or less of the array pitch of the structures,
• 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°).