Hybrid optics LED headlamp
An optical system that collects 100% of the light emitted from the light source and effectively directs it into the desired beam pattern. This is achieved by a combination of different optical control methods including reflector and lens optics. The cost is controlled by a design that reduces the optical part count to 2 main components, which reduces manufacturing and assembling time and maintains proper alignment to the light source and system.
1. A headlamp assembly operable to project light in a forward direction, comprising:
a housing;
a light emitting device arranged in the housing and having a planar surface from which light is emitted;
a lens arranged in the housing with a planar light receiving surface configured to receive a portion of the light emitted from the light emitting device and the lens operates to direct the light in the forward direction, the light receiving surface of the lens is oriented towards the planar surface of the light emitting device and forms an acute angle therebetween; and
a reflector includes a parabolic reflecting surface and a planar reflecting surface which collectively surround the light emitting device, the parabolic reflecting surface and the planar reflecting surface are configured to receive remaining portion of the light emitted from the light emitting device and reflect the remaining portion of the light in the forward direction, the planar surface of the light emitting device is oriented towards the parabolic reflecting surface and away from the planar reflecting surface such that the planar surface of the light emitting device and the planar reflecting surface form an obtuse angle therebetween.
2. The headlamp assembly of claim 1 wherein the lens is constructed as a cylindrical extrusion with a condensing lens profile.
3. The headlamp assembly of claim 1 wherein the lens is formed in shape of a cylinder cut in half along a longitudinal axis thereof, the lens having a flat surface opposing a curved surface and the flat surface facing the light emitting device.
4. The headlamp assembly of claim 3 wherein the curved surface of the lens is truncated on a side facing upward.
5. The headlamp assembly of claim 1 wherein the reflector is configured such that light is only reflected once off a surface thereof.
6. The headlamp assembly of claim 1 wherein the reflector is positioned above the lens and the light emitting device and has a reflecting surface with shape obtained by revolving a parabola ninety degrees around its axis.
7. The headlamp assembly of claim 1 wherein the reflector includes a plurality of segments, each segment shaped parabolic shape.
8. The headlamp assembly of claim 1 wherein the reflector having a plurality of segments, such that each segment having a different focal point on the planar surface of the light emitting device.
9. The headlamp assembly of claim 1 wherein the light emitting device is further defined as a light emitting diode.
10. A headlamp assembly operable to project light in a forward direction along a horizontal plane, comprising:
a housing;
a light emitting device arranged in the housing and having a planar surface from which light is emitted, where the planar surface of the light emitting device is facing towards a horizontal plane aligned vertically above the light emitting device and forms an acute angle with the horizontal plane;
a lens with a planar light receiving surface configured to receive a portion of the light emitted from the light emitting device and operates to direct the light as parallel rays in the forward direction, the light receiving surface of the lens is oriented towards the planar surface of the light emitting device and forms an acute angle therebetween; and
a reflector arranged in the housing and encircling a portion of the optical axis in the forward direction, the reflector configured to receive entire remaining portion of the light emitted from the light emitting device and reflect the remaining portion of the light as parallel rays in the forward direction.
11. The headlamp assembly of claim 10 wherein the lens is constructed as a cylindrical extrusion with a condensing lens profile.
12. The headlamp assembly of claim 10 wherein the lens is formed in shape of a cylinder cut in half along a longitudinal axis thereof, the lens having a flat surface opposing a curved surface and the flat surface facing the light emitting device.
13. The headlamp assembly of claim 12 wherein the curved surface of the lens is truncated on a side facing upward, thereby permitting the remaining portion of the light emitted from the light emitting device to project directly on a reflecting surface of the reflector.
14. The headlamp assembly of claim 13 wherein the truncated surface of the lens facing upward is concave.
15. The headlamp assembly of claim 14 wherein the reflector is configured such that light is only reflected once off a surface thereof.
16. The headlamp assembly of claim 15 wherein the reflector having an aperture in which to receive the emitted from the light emitting device, wherein the reflector includes a reflecting surface with shape obtained by revolving a parabola ninety degrees around its axis and a substantially flat lower surface.
17. The headlamp assembly of claim 16 wherein the reflecting surface is partitioned into a plurality of segments having a parabolic shape.
18. The headlamp assembly of claim 17 wherein each segment of the plurality of segments having a different focal point on the planar surface of the light emitting device.
19. The headlamp assembly of claim 18 wherein the light emitting device is further defined as a light emitting diode.
20. The headlamp assembly of claim 1 wherein the light receiving surface of the lens forms a forty-five degree angle with the planar surface of the light emitting device.