Lamp having lens element for distributing light
View Patent ↗Embodiments of a lamp that distributes light from one or more light emitting diode (LED) devices with an intensity distribution having a batwing appearance. These embodiments can comprise a lens having a lens body with different types of optics to achieve the preferred distribution. In one example, the lens body has a first section with optics that embody a plurality of prismatic facets and a second section with optics that form a convex shape, curving outward relative to the LED device.
1. A lighting system, comprising:
a light source comprising a light emitting diode device and having an optical axis; and
a lens disposed in position to receive light from the light source, the lens having a body with a top, a bottom, an inner surface proximate the optical axis, and an outer surface;
wherein the inner surface is disposed at an angle greater than 0° and less than 90° as measured between the optical axis and a plane that is tangent to at least one point on the inner surface; and
wherein the outer surface comprises:
a first section proximate the top in which the outer surface forms a first optic, wherein the first optic comprises a plurality of prismatic facets, and
a second section proximate the bottom in which the outer surface forms a second optic, wherein the second optic comprises geometry that causes the outer surface to curve convexly away from the optical axis.
2. The lighting system of claim 1 , further comprising a third optic disposed at the top of the lens and aligned with the optical axis, the third optic in position to receive light from the light source.
3. The lighting system of claim 2 , wherein the third optic has optical properties for spreading the light.
4. The lighting system of claim 2 , wherein the third optic comprises an optically clear material with light scattering particles distributed therein.
5. The lighting system of claim 2 , wherein the body integrates monolithically with the third optic.
6. The lighting system of claim 1 , wherein the first optic and the second optic are configured to cause the lens to distribute light with a first intensity distribution having a batwing appearance.
7. The lighting system of claim 1 , wherein the lens has a cross-section profile that includes a second opening at the top.
8. A lens, comprising:
a body with a centerplane and a cross-section profile, the cross-section profile defining an inner surface and a outer surface, wherein the inner surface is disposed at an angle that is greater than 0° degrees and less than 90° as measured between the centerplane and a plane that is tangent to at least one point on the inner surface, and
wherein the outer surface comprises a first section forming a plurality of prismatic shapes and a second section that forms a convex shape that curves away from the centerplane;
wherein the body forms an elongated element that corresponds to extruding the cross-section profile along a manufacture axis that is perpendicular to the centerplane.
9. The lens of claim 8 , wherein the cross-section profile has a frusto-conical shape.