Lens to produce high angle off-axis light with narrow beam width
The present disclosure is directed to examples of an apparatus. In one embodiment, the apparatus includes a light entry segment that receives light emitted from a light emitting diode (LED), a total internal reflection (TIR) segment to reflect the light towards an optical axis of the LED, and a light redirection segment comprising a plurality of light redirecting segments to redirect the light emitted from the light emitting diode and the light reflected by the TIR segment at an angle greater than 45 degrees relative to an optical axis of the LED.
1. An apparatus, comprising:
a substrate;
a total internal reflection (TIR) lens formed below the substrate and around a light emitting diode (LED);
a first light redirecting segment formed above the substrate and positioned to a first side of the substrate;
a second light redirecting segment formed towards a center of the substrate, wherein the second light redirecting segment comprises a first portion formed below a bottom surface of the substrate and a second portion formed above a top surface of the substrate; and
a third light redirecting segment formed above the substrate and positioned to a second side of the substrate that is opposite the first side.
2. The apparatus of claim 1 , further comprising:
a groove formed below the top surface of the substrate and between the third light redirecting segment and the second side of the substrate.
3. The apparatus of claim 1 , wherein the first light redirecting segment redirects light emitted from the LED at an angle from 180 degrees to 120 degrees.
4. The apparatus of claim 1 , wherein the second light redirecting segment redirects light emitted from the LED at an angle from 60 degrees to 120 degrees.
5. The apparatus of claim 1 , wherein the third light redirecting segment redirections light emitted from the LED at an angle from 0 degrees to 60 degrees.
6. The apparatus of claim 1 , further comprising:
a refractive segment located between the second light redirecting segment and the third light redirecting segment, wherein the refractive segment allows a portion of light emitted from the LED to pass through.
7. The apparatus of claim 1 , wherein the first light redirecting segment, the second light redirecting segment, and the third light redirecting segment each comprise:
a light exiting surface; and
a TIR surface that is coupled to the light exiting surface at an angle.
8. The apparatus of claim 1 , further comprising:
a light recycling segment positioned adjacent to the first light redirecting segment to redirect light that escapes from the first light redirecting segment, the second light redirecting segment, and the third light redirecting segment back towards the substrate.
9. The apparatus of claim 8 , wherein the light recycling segment comprises:
a light entering surface; and
a TIR surface or a light exiting surface.
10. A luminaire, comprising:
at least one light emitting diode (LED) to emit light; and
a lens to redirect the light emitted from the at least one LED at an angle that is 45 degrees or greater relative to an optical axis of the at least one LED, the lens comprising:
a substrate;
a total internal reflection (TIR) lens formed below the substrate and around the at least one LED;
a first light redirecting segment formed above the substrate and positioned to a first side of the substrate;
a second light redirecting segment formed towards a center of the substrate, wherein the second light redirecting segment comprises a first portion formed below a bottom surface of the substrate and a second portion formed above a top surface of the substrate; and
a third light redirecting segment formed above the substrate and positioned to a second side of the substrate that is opposite the first side.
11. The luminaire of claim 10 , wherein the light emitted from the at least one LED that is redirected from the lens is collimated to have a vertical beam spread from 10 degrees to 50 degrees.
12. The luminaire of claim 10 , wherein the light emitted from the at least one LED that is redirected from the lens is spread to have a horizontal beam spread from 50 degrees to 100 degrees.