Total internal reflection lens and mechanical retention and locating device

A lens assembly, comprising:

• an optical body member having a first end, a second end opposite the first end, and an outer surface, the optical body member being substantially symmetric with respect to an optical axis, the outer surface being shaped to provide total internal reflection for light from a light source having a specified position in relation to the first end,
• the optical body member further having an interior open channel extending longitudinally from the first end to the second end thereof, the interior open channel being substantially symmetric with respect to the optical axis, the interior open channel having a first opening at the first end for accommodating the light source and a second opening at the second end,
• the optical body member further having a plurality of refractive surface regions disposed in the second end thereof and around the second opening of the interior open channel;
• and
• a holder having a concave interior surface shaped to accommodate the optical body member and a convex exterior surface, the holder having a first opening disposed to surround the first opening of the optical body member and a second opening opposite the first opening, wherein the optical body member is insertable into the holder through the second opening,
• the holder having three or more support members extending from the exterior surface toward the first opening, the support members being adapted for centering the optical body member with respect to the light source and maintaining the light source in the specified position in relation to the optical body member.