Dual CCT automotive headlight

Patent metadata

Field	Value
Publication number	US-10871264-B2
Application number	US-201916712465-A
Country	US
Kind code	B2
Filing date	Dec 12, 2019
Priority date	Dec 13, 2018
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A dual CCT automotive headlight is described herein, comprising: at least one first LED configured to emit light of a first color; at least one second LED configured to emit light of a second color different from the first color; a light mixing device arranged to receive and mix light from the at least one first LED and the at least one second LED and to emit the mixed light. The dual CCT automotive headlight can not only provide homogeneous light of the first color and homogeneous light of the second color, but can also provide homogeneous light of a mixed color.

First claim

The invention claimed is:

1. A dual CCT automotive headlight, comprising:
at least one first LED configured to emit light of a first color;
at least one second LED configured to emit light of a second color different from the first color;
a light mixing device arranged to receive and mix light from the at least one first LED and the at least one second LED and to emit the mixed light,
wherein the light mixing device comprises:
a body made of a material having a higher refractive index than air and comprising scattering particles distributed within the material; wherein,
the outer surface of the body comprises a light incident area and a light emergent area, the light incident area being arranged to receive the light from the at least one first LED and the at least one second LED; and
the material and the scattering particles are arranged for mixing the received light and emitting the mixed light from the light emergent area,
wherein the light emergent area is smaller than the light incident area.

2. The dual CCT automotive headlight according to claim 1 , wherein the light emergent area has a rectangle shape with a length ranging from 3.8 mm to 4.4 mm and a width ranging from 1.1 mm to 1.7 mm.

3. The dual CCT automotive headlight according to claim 1 , wherein a cross-sectional shape of the body along a direction from the light emergent area to the light incident area is axisymmetric.

4. The dual CCT automotive headlight according to claim 3 , wherein the cross-sectional shape of the body along a direction from the light emergent area to the light incident area is an isosceles trapezoid.

5. The dual CCT automotive headlight according to claim 4 , wherein the isosceles trapezoid has a height (h) of less than 2 mm.

6. The dual CCT automotive headlight according to claim 1 , wherein the light mixing device further comprises:
a reflector provided on an area of the outer surface of the body between the light emergent area and the light incident area and configured to reflect light incident thereon back into the body.

7. The dual CCT automotive headlight according to claim 6 , wherein the reflectivity of the reflector is greater than 95%.

8. The dual CCT automotive headlight according to claim 1 , wherein the transmittance of the body is greater than 75%.

9. The dual CCT automotive headlight according to claim 1 , further comprising:
a controller configured to be empowered via an external switch, and to control the at least one first LED and the at least one second LED to emit light at the same time.

10. The dual CCT automotive headlight according to claim 9 , wherein the light of the first color comprises cool white light and the light of the second color comprises amber light.

11. The dual CCT automotive headlight according to claim 10 , wherein the luminous flux of the cool white light ranges from 1080 to 1320 lumens, and the luminous flux of the amber light ranges from 135 to 165 lumens.

12. The dual CCT automotive headlight according to claim 1 , comprising a plurality of first LEDs and a plurality of second LEDs arranged in an array in which the first LEDs alternate with the second LEDs.

13. The dual CCT automotive headlight according to claim 12 , wherein the light emergent area of the body is smaller than a light emitting area of the array.

Assignees

• Lumileds Holding Bv

Inventors

• Huang Ying
• Huang Colin
• Xiao Jimmy
• Wang Bao
• Spinger Benno

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/882

  Scattering means (H10H20/82 takes precedence) · CPC title

• F21S43/2492

  having two or more input branches · CPC title

• F21S41/141

  Light emitting diodes [LED] · CPC title

• F21S41/663 Primary

  by switching light sources (by switching incandescent light sources F21S41/162) · CPC title