Optics for slim style head lighting

Patent metadata

Field	Value
Publication number	US-12153225-B2
Application number	US-202318517778-A
Country	US
Kind code	B2
Filing date	Nov 22, 2023
Priority date	Dec 15, 2022
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

An optical system is provided. The optical system includes a light emitting diode that generates light emissions. The optical system includes a collimator that receives the light emissions and that generates a collimated beam. The optical system includes an etendue re-shaper that splits the collimated beam into beam parts and that arranges the beam parts adjacent to each other to generate an adjacent beam part arrangement. The optical system includes micro-lens arrays that receive the adjacent beam part arrangement and that generate beams. Each of the beams includes an optimum optical efficiency or a far field intensity distribution.

First claim

What is claimed is:

1. An optical system for a vehicle, the optical system comprising:
a light emitting diode configured to generate light emissions when powered on;
a collimator configured to receive the light emissions and generate a collimated beam;
an etendue re-shaper configured to split the collimated beam into at least two beam parts and arrange the at least two beam parts adjacent to each other to generate an adjacent beam part arrangement, wherein the etendue re-shaper comprises the phase space volume re-shaper; and
one or more micro-lens arrays configured to receive the adjacent beam part arrangement and generate two or more beams, each of the two or more beams comprising an optimum optical efficiency or a far field intensity distribution.

2. The optical system of claim 1 , wherein the optical system is configured to make the light emissions parallel or nearly parallel to at or below acceptance angles for the one or more micro-lens arrays.

3. The optical system of claim 1 , wherein the optical system is configured to reduce or eliminate optical cross-talks between adjacent optical channels of the one or more micro-lens arrays.

4. The optical system of claim 1 , wherein the light emitting diode comprises a high luminance light source, with a small, high flux, Lambertian radiation profile.

5. The optical system of claim 1 , wherein the light emissions comprise a first etendue that are collimated by the collimator into a collimated beam etendue shape of the collimated beam.

6. The optical system of claim 1 , wherein the etendue re-shaper comprises a first part that reshapes a first beam part of the at least two beam parts.

7. The optical system of claim 6 , wherein the etendue re-shaper comprises a second part that propagates a second beam part of the at least two beam parts.

8. The optical system of claim 7 , wherein the first and second beam parts are combined at an exit plane of the etendue re-shaper to generate the adjacent beam part arrangement.

9. The optical system of claim 1 , wherein the adjacent beam part arrangement comprises a collimated beam with a reduced height and an increased width.

10. The optical system of claim 1 , wherein the far field intensity distribution of a first beam of the two or more beams being different than the far field intensity distribution of a second beam of the two or more beams.

11. The optical system of claim 1 , wherein the optical system comprises one or more gaps for mechanical frames around the one or more micro-lens arrays.

12. The optical system of claim 1 , wherein the etendue re-shaper comprises a symmetrical design of a first part and a second part.

13. The optical system of claim 1 , wherein the etendue re-shaper comprises reflective surfaces.

14. The optical system of claim 1 , wherein the etendue re-shaper comprises polymethyl methacrylate or polycarbonate.

15. The optical system of claim 1 , wherein the light emitting diode is configured to emit the light emissions comprising a light emitting area within a range of 0.9×1.2 mm wide by 0.6×1.2 mm high into the collimator.

16. The optical system of claim 15 , wherein the collimated beam comprises a beam size at an exit of the collimator and an entrance of the etendue re-shaper is larger than 15×15 mm 2 .

17. The optical system of claim 15 , wherein the collimated beam comprises a full width at half maximum of approximately two degrees (2°).

18. The optical system of claim 1 , wherein the etendue re-shaper slices the collimated beam from the collimator spatially into at least two equal parts.

19. The optical system of claim 1 , wherein the etendue re-shaper widens the collimated beam into the adjacent beam part arrangement while conserving a phase space volume.

20. The optical system of claim 1 , wherein the phase space volume re-shaper comprises a spatial component and a conjugate angular component.

Assignees

• Lumileds Llc

Inventors

• Crompvoets Floris Maria Hermansz
• Timinger Andreas

Classifications

• F21S41/143

  the main emission direction of the LED being parallel to the optical axis of the illuminating device · CPC title

• F21S41/25 Primary

  Projection lenses · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• G02B27/0916

  Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers (coupling into light guides using intermediate optical elements G02B6/4204; details of lighting devices in general F21V) · CPC title

• G02B27/0905

  Dividing and/or superposing multiple light beams · CPC title