LED module for vehicle headlight and vehicle headlight with such LED module
An LED module for a vehicle headlight and a vehicle headlight are described. The LED module includes an array of LEDs ( 22 ) and an optic ( 23 ) opposite the array of LEDs ( 22 ). The optic ( 23 ) is configured to receive light from the array of LEDs ( 22 ) and direct at least part of the received light. The optic ( 23 ) has a light passing area ( 24 ) configured to pass light directly from the array of LEDs.
1. A light-emitting diode (LED) module comprising:
an array of rows and columns of a plurality of LEDs, and
a primary optic opposite the array, the primary optic comprising:
at least one lens configured to collimate a Lambertian emission pattern emitted by a first subset of the LEDs to a restricted angular range, wherein the subset comprises less than all, and more than one, of the plurality of LEDs, and
a light passing area having no lenses and configured to pass light directly from a second subset of the LEDs without optical processing of the light.
2. The LED module according to claim 1 , wherein the light passing area is one of an aperture in the primary optic or a transparent plate that is integral with the primary optic and formed from the same material.
3. The LED module according to claim 1 , wherein a distance between two neighboring LEDs opposite the light passing area is smaller than a distance between two neighboring LEDs opposite an area of the primary optic other than the light passing area.
4. The LED module according to claim 1 , wherein the light passing area is located in at least one of:
a center of the primary optic,
a lower part of the primary optic, or
an upper part of the primary optic.
5. The LED module according to claim 1 , wherein the primary optic is a widening optic.
6. The LED module according to claim 5 , wherein the at least one lens comprises one of:
a cylinder lens covering the array of LEDs except for LEDs located adjacent the light passing area,
an array of cylinder lenses with each cylinder lens of the array covering a row of the array of LEDs except for LEDs located adjacent the light passing area, or
an array of lenslets with each of the lenslets of the array covering an LED of the array of LEDs except for LEDs located adjacent the light passing area.
7. The LED module according to claim 1 , wherein the array of LEDs comprises one of:
a 2 by 12 array of LEDs,
a 2 by 16 array of LEDs, and
a 2 by 20 array of LEDs.
8. A vehicle headlight comprising:
an LED module comprising:
an array of a plurality of LEDs, and
a primary optic opposite the array, the primary optic comprising:
at least one lens configured to collimate a Lambertian emission pattern emitted by a first subset of the LEDs to a restricted angular range, wherein the subset comprises less than all, and more than one, of the plurality of LEDs; and
a light passing area having no lenses and configured to pass light directly from a second subset of the LEDs without optical processing of the light; and
a lamp housing on which the LED module is mounted.
9. The vehicle headlight according to claim 8 , further comprising a secondary optic.
10. The vehicle headlight according to claim 9 , wherein the primary optic is configured to direct the Lambertian emission pattern toward the secondary optic, and wherein the light passing area is configured to pass the light directly from the array to the secondary optic.
11. The vehicle headlight according to claim 9 , wherein the secondary optic comprises:
a single projection lens, and
a group of lenses, at least one lens of the group of lenses having a surface curved to image two neighboring LEDs in a row of the array without a darker area between images of the two LEDs.
12. The vehicle headlight according to claim 9 , wherein the secondary optic comprises:
a group of lenses with at least one lens of the group of lenses being configured to reduce at least one of spherical and chromatic aberration in an image of the array.
13. The vehicle headlight according to claim 9 , wherein the secondary optic comprises a group of two to four lenses.
14. The vehicle headlight according to claim 9 , wherein the secondary optic comprises at least one of:
a part having a focal area at an exit face of the primary optic, and
a part having a focal area at a light emitting area of an LED of the array of LEDs opposite the light passing area of the primary optic.
15. The vehicle headlight according to claim 8 , wherein the light passing area is one of an aperture in the primary optic or a transparent plate that is integral with the primary optic and formed from the same material.
16. The vehicle headlight according to claim 8 , wherein a distance between two neighboring LEDs opposite the light passing area is smaller than a distance between two neighboring LEDs opposite an area of the primary optic other than the light passing area.
17. The vehicle headlight according to claim 8 , wherein the light passing area is located in at least one of:
a center of the primary optic,
a lower part of the primary optic, or
an upper part of the primary optic.
18. The vehicle headlight according to claim 8 , wherein the primary optic is a widening optic.
19. The vehicle headlight according to claim 8 , wherein the at least one lens comprises one of:
a cylinder lens covering the plurality of LEDs except for the light passing area,
an array of cylinder lenses with each cylinder lens of the array covering a row of the plurality of LEDs except for the light passing area, or
an array of lenslets with each of the lenslets of the array covering an LED of the plurality of LEDs except for LEDs located adjacent the light passing area.
20. The vehicle headlight according to claim 8 , wherein the array comprises one of:
a 2 by 12 array of LEDs,
a 2 by 16 array of LEDs, and
a 2 by 20 array of LEDs.