Lighting device

Patent metadata

Field	Value
Publication number	US-2016178174-A1
Application number	US-201615054093-A
Country	US
Kind code	A1
Filing date	Feb 25, 2016
Priority date	Aug 11, 2008
Publication date	Jun 23, 2016
Grant date	—

Abstract

A lighting device includes a substrate and a planar light source portion including a plurality of LED chips arrayed on the substrate. The planar light source portion faces an illumination space (space to be illuminated) by a predetermined opening area. The plurality of LED chips are arrayed on the substrate such that the mounting density with respect to the opening area is not less than 3/cm 2 , and accordingly, a planar light source is formed.

First claim

What is claimed is:

1 . A lighting device, comprising:
a substrate; a plurality of LED chips that are supported on the substrate and that are disposed in an array extending in a first direction, the LED chips including a first LED chip and a second LED chip adjacent the first LED chip, each of the LED chips having an anode terminal and a cathode terminal; and a wiring pattern having a oblique portion that connects the anode terminal of the first LED chip and the cathode terminal of the second LED chip, the oblique portion extending in a second direction that is transverse with respect to the first direction.

2 . The lighting device according to claim 1 , wherein the array is a first array and the LED chips include an end LED chip at an end of the first array, and further comprising
plurality of further LED chips that are supported on the substrate and that are disposed in a second array, each of the further LED chips having an anode terminal and a cathode terminal, the further LED chips including an end LED chip at an end of the second array; and an anode electrode supported on the substrate, the end LED of the first array and the end LED of the second array being electrically connected to the anode electrode.

3 . The lighting device according to claim 2 , wherein the second array extends on the first direction.

4 . The lighting device according to claim 2 , wherein the first and second arrays of LED chips are disposed in a circular region and the anode electrode has a section that is generally arcuate in shape and that faces the generally circular region.

5 . The lighting device according to claim 4 , wherein the first and second arrays are parallel to one another, both arrays extending in the first direction.

6 . The lighting device according to claim 2 , wherein the first and second arrays have further ends and the LED chips of the first and second arrays include further end LED chips, and further comprising:
a cathode electrode supported on the substrate, the further and LED chips of the first and second arrays being electrically connected to the cathode electrode.

7 . The lighting device according to claim 6 , wherein the first and second arrays are parallel to one another, both arrays extending in the first direction.

8 . The lighting device according to claim 6 , wherein the first and second arrays of LED chips are disposed in a circular region and the cathode electrode has a section that is generally arcuate in shape and that faces the generally circular region.

9 . The lighting device according to claim 8 , wherein the first and second arrays are parallel to one another, both arrays extending in the first direction.

10 . The lighting device according to claim 1 , wherein the LED chips include an end LED chip at an end of the array, and further comprising a cathode electrode supported on the substrate, the cathode terminal of the end LED chip being electrically connected to the cathode electrode.

11 . The lighting device according to claim 10 , wherein the array of LED chips is disposed in a circular region and the cathode electrode has a section that is generally arcuate in shape and that faces the generally circular region.

Assignees

• Rohm Co Ltd

Inventors

• Fujita Toshiyuki
• Watanabe Toshio
• Kawabata Yusaku

Classifications

• H10W90/754

  between a chip and a stacked insulating package substrate, interposer or RDL · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• F21S8/02

  of recess-mounted type, e.g. downlighters (specially adapted for vehicle exteriors F21S41/00-F21S45/00) · CPC title

• F21V23/02

  the elements being transformers, impedances {or power supply units, e.g. a transformer with a rectifier} · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title