Hybrid optics LED headlamp
This invention provides 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 as parallel rays 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, where the planar surface is oriented at substantially forty-five degrees in relation to the forward direction;
a lens arranged in the housing, the lens having 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 in the forward direction, the light receiving surface of the lens is oriented at substantially forty-five degrees in relation to the planar surface of the light emitting device and oriented perpendicular to the forward direction; and
a reflector having a parabolic reflecting surface 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, wherein the lens is arranged in relation to the reflector such that the remaining portion of the light reflected is not incident upon any surface of the lens,
wherein the lens has a condensing profile formed in shape of a cylinder cut longitudinally to form the planar light receiving surface opposing a curved surface and the curved surface of the lens and the planar light receiving surface are truncated forming a truncated side between the curved surface and the planar light receiving surface, the truncated surface facing the parabolic reflecting surface of the reflector such that light directly from the light emitting device passing closest to the truncated surface of the lens is captured by the reflector and redirected into the beam.
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 flat surface of the lens is facing the light emitting device.
4. The headlamp assembly of claim 1 wherein the planar light receiving surface of the lens intersects with a plane aligned with the planar surface of the light emitting device and thereby receives light emitted substantially parallel to the planar surface of the light emitting device.
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 around 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. The headlamp assembly of claim 1 wherein the light directly from the light emitting device passing closest to the truncated surface is directed to an outer edge of the reflector.
11. The headlamp assembly of claim 1 wherein the truncated surface is substantially parallel with portion of the parabolic reflecting surface directly opposed to and facing the truncated surface.
12. 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 substantially a forty-five degree 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, where the light receiving surface of the lens faces away from the forward direction and is oriented at substantially forty-five degrees in relation to the planar surface of the light emitting device; and
a reflector arranged in the housing and 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, wherein the lens is arranged in relation to the reflector such that light emitted from the light emitting device has only a single interaction with either the lens or the reflector,
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 curved surface of the lens is truncated on a side facing the parabolic reflecting surface of the reflector such that the truncated surface is substantially parallel with portion of the parabolic reflecting surface directly opposed to and facing the truncated surface.
13. The headlamp assembly of claim 12 wherein the lens is constructed as a cylindrical extrusion with a condensing lens profile.
14. The headlamp assembly of claim 12 wherein the flat surface of the lens is facing the light emitting device.
15. The headlamp assembly of claim 12 wherein the truncated surface of the lens is concave.
16. The headlamp assembly of claim 12 wherein the planar light receiving surface of the lens intersects with a plane aligned with the planar surface of the light emitting device and thereby receives light emitted substantially parallel to the planar surface of the light emitting device.
17. The headlamp assembly of claim 15 wherein the reflector is configured such that light is only reflected once off a surface thereof.
18. The headlamp assembly of claim 17 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.
19. The headlamp assembly of claim 18 wherein the reflecting surface is partitioned into a plurality of segments having a parabolic shape.
20. The headlamp assembly of claim 19 wherein each segment of the plurality of segments having a different focal point on the planar surface of the light emitting device.
21. The headlamp assembly of claim 20 wherein the light emitting device is further defined as a light emitting diode.
22. The headlamp assembly of claim 16 wherein the reflector is a section of a truncated cone, such that light emitting device is arranged in truncated end of the cone and reflecting inner surface of the truncated cone extends from the plane aligned with the planar surface of the light emitting device.