LED ARRAY WITHIN ASYMMETRIC CAVITY HAVING REFLECTIVE AND NON-REFLECTIVE REGIONS

摘要

A packaged light emitting device 100 that allows enhanced light cutoff in lighting applications to better control glare and optimize lumen output. Packaged device 100 includes an LED array 4 in cavity 32 whose inner wall includes both a reflective wall portion 34 and a non-reflective wall portion 36 to increase output of useful light while mitigating reflection of light that can cause glare. An array 4, preferably linear, of light-emitting diodes 3 is formed on printed circuit board (PCB) 1, and surrounded by wall 30 which bounds cavity 32. A first circuit board portion 20 of PCB upper surface 2 enclosed within wall 30 disposed forward of LED array 4 and adjoining non-reflective wall portion 36 is non-reflective, such as being black. A second circuit board portion 22 is reflective, such as being silvered. Packaged device 100 is suited for automotive headlights and fog lights.

主权项

1. A packaged light emitting device (100) comprising:
a planar circuit board (1) having an upper surface (2); a plurality of light-emitting diodes (LEDs) (3) coupled to the circuit board upper surface (2) and arrayed in an LED array (4), said array (4) defining a first major long axis (6) extending tangent to a long side of the array (4) on a laterally forward direction (14) of the array, said array further defining two opposed lateral sides (8, 10); a wall (30) disposed on the circuit board (1) and surrounding, in spaced relation, the LED array (4), the wall (30) bounding, on an inner region thereof, a cavity (32); a first circuit board portion (20) being the circuit board upper surface (2) disposed within the cavity (32) and located in a forward region (12) disposed in the laterally forward direction (14) of the first major long axis (6), wherein the first circuit board portion (20) is non-reflective; a second circuit board portion (22) being the portion of the circuit board upper surface (2) within the cavity (32) less the first circuit board portion (20), wherein the second circuit board portion (22) is reflective; the wall (30) defining a reflective wall portion (34) and a non-reflective wall portion (36), the reflective wall portion (34) and the non-reflective wall portion (36) collectively defining an entirety of the wall (30); the non-reflective wall portion (36) being a region of the wall (30) disposed in the laterally forward direction (14) forward of an intersection of the first major long axis (6) and the wall (30); the reflective wall portion (34) occupying a remainder region of the wall (30) and disposed in a rearward direction (16) behind the first major long axis (6); wherein the non-reflective wall portion (34) is transverse to the planar circuit board (1); and wherein an inwardly facing wall (35) of the reflective wall portion (34) that faces the array (4) defines an included angle (θ) relative the circuit board upper surface (2) that is less than 90 degrees.