Optical member, method of manufacturing optical member, and image display system

An optical member comprising:

• a light-transmissive substrate including a substrate surface;
• and
• a plurality of reflecting surfaces located inside the substrate, comprising at least a first reflecting surface and a second reflecting surface, and configured to reflect at least a portion of incident light, wherein
• the first reflecting surface is inclined at a first angle relative to the substrate surface,
• the second reflecting surface is inclined at a second angle relative to the substrate surface, the second angle being different from the first angle,
• each of the plurality of reflecting surfaces is located only on a respective inclined face inside the light-transmissive substrate,
• each of the plurality of reflecting surfaces is inclined at an angle that gradually increases in accordance with a distance of the respective reflecting surface from a center of the optical member,
• an inclination of each of the plurality of reflecting surfaces relative to the substrate surface corresponds to a virtual surface shape inside the substrate, and
• the virtual surface shape is a Fresnel shape including a plurality of annular surfaces that surround a predetermined reference point on the substrate surface, such that
• a first portion of the light incident on the optical member is reflected along a direction of specular reflection of the optical member, a second portion of the light incident on the optical member is reflected in a direction other than along the direction of specular reflection, and a third portion of the light incident on the optical member is transmitted through the optical member.