Patent ID: 6966662

Claim:
A reflector comprising: a substrate; and a plurality of light-reflective concave portions formed on a surface of the substrate, wherein each of the concave portions is formed with a first curved surface located at one peripheral portion of the concave portion and a second curved surface located at an opposing peripheral portion thereof, and a deepest point of the concave portion is located on the first curved surface, a maximum value of an absolute value of tilt angle of the second curved surface to the surface of the substrate is larger than that of the first curved surface, each of the concave portions comprises a specific longitudinal section which passes through the deepest point of the concave portion, and the specific longitudinal section has an inner shape which is defined by a first delimiting line delimiting the first curved surface and a second delimiting line delimiting the second curved surface, the first delimiting line extends from one peripheral portion through the deepest point to a boundary between the first and second curved surfaces, the second delimiting line is continuous with the first delimiting line and extends from the boundary between the first and second curved surfaces to the opposing peripheral portion, and the maximum value of the absolute value of the tilt angle of the second delimiting line to the surface of the substrate is larger than that of the first delimiting line to the surface of the substrate.