Light distribution controller, light-emitting device using the same, and method for fabricating light distribution controller

A light distribution controller, comprising:

• a first optical member configured to cover a light source;
• and
• a second optical member configured to cover the first optical member,
• wherein
• the first optical member has a shape of a circular truncated cone or of a prismoid which tapers from the light source, and has a first concave portion which is formed from an upper surface of the circular truncated cone or prismoid in a downward direction along a central axis of the circular truncated cone or prismoid,
• the first concave portion has an opening whose area increases in an upward direction along the central axis,
• light emitted from the light source has a Lambertian light distribution characteristic, and has a maximum light intensity in a direction along the central axis,
• when outputting the light emitted from the light source toward the second optical member, the first optical member converts the light into light having a light distribution characteristic which has an annular peak of light intensity centered around the central axis,
• the second optical member has a second concave portion formed along the central axis, the second concave portion having an opening whose area increases in an upward direction along the central axis, and
• of the light having the light distribution characteristic incident from the first optical member upon the second optical member, light incident upon a surface forming the second concave portion is totally reflected at the surface.