Total internal reflection lens and lens holder

1. 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 curved refractive surface regions disposed in the second end thereof and around the second opening of the interior open channel,

the second end including a peripheral flange that is free of curved refractive surface regions, the peripheral flange having one or more index regions and one or more notches formed therein; and

a substantially cylindrical support member having a hollow interior region shaped to accommodate the optical body member and a top rim region having one or more slots for receiving the index regions of the optical body member and one or more snap clips for fitting to the notches of the peripheral flange region of the optical body member and thereby retaining the optical body member, the support member being adapted for centering the optical body member and maintaining the light source at a predetermined position with respect to a the optical body member.

2. The lens assembly of claim 1 wherein the optical body member further comprises a concave surface at the second end, wherein the plurality of curved refractive surface regions are formed in the concave surface.

3. The lens assembly of claim 1 wherein the interior open channel is characterized by a substantially cylindrical sidewall extending from the first opening to the second opening of the interior open channel substantially without bending.

4. The lens assembly of claim 1 wherein the multiple refractive surface regions comprise hexagonal microlenses having a curvature and a lateral dimension selected to provide a predetermined beam width.

5. The lens assembly of claim 1 wherein the support member further comprises one or more cut outs in a side wall, the cut outs configured to allow passage of electrical connectors of the light source.

6. A lighting apparatus, comprising:

a light source, the light source including one or more light-emitting diodes (LEDs) disposed on a substrate and a primary lens overlying the LEDs;

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 the 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 curved refractive surface regions disposed in the second end thereof and around the second opening of the interior open channel,

the second end including a peripheral flange that is free of curved refractive surface regions, the peripheral flange having one or more index regions and one or more notches formed therein; and

a substantially cylindrical support member having a hollow interior region shaped to accommodate the optical body member and a top rim region having one or more slots for receiving the index regions of the optical body member and one or more snap clips for fitting to the notches of the peripheral flange region of the optical body member and thereby retaining the optical body member, the support member being adapted for centering the optical body member and maintaining the light source at a predetermined position with respect to a the optical body member.

7. The lighting apparatus of claim 6 wherein the optical body member further comprises a concave surface at the second end, the plurality of curved refractive surface regions being formed in the concave surface.

8. The lighting apparatus of claim 6 wherein the interior open channel is characterized by a substantially cylindrical sidewall extending from the first opening to the second opening of the interior open channel substantially without bending.

9. The lighting apparatus of claim 6 wherein the multiple refractive surface regions comprise hexagonal microlenses having a curvature and a lateral dimension selected to provide a predetermined beam width.

10. The lighting apparatus of claim 6 wherein the light source comprises one or more light-emitting-diodes disposed on a substrate that includes a plurality of notches.

11. The lighting apparatus of claim 6 wherein the support member further comprises one or more cut outs in a side wall, the cut outs configured to allow passage of electrical connectors of the light source.