Printed circuit board for a lamp

Patent metadata

Field	Value
Publication number	US-2016010834-A1
Application number	US-201414770024-A
Country	US
Kind code	A1
Filing date	Mar 25, 2014
Priority date	Mar 28, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

The invention relates to a printed circuit board ( 9 ) for a lamp ( 1 ), having a plurality of circuit paths having a multiplicity of light-emitting diodes ( 8, 12 ), wherein the light-emitting diodes in a circuit path are each connected up in series with one another and the circuit paths are connected in parallel with one another, wherein a first number of light-emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) in a circuit path are fitted on a front of the printed circuit board and a second number of light-emitting diodes (LDi 11 , LDi 31 , LDi 52 ) in the same circuit path are fitted on a back of the printed circuit board.

First claim

1 . A printed circuit board for a luminaire, comprising a plurality of circuit branches having a multiplicity of light emitting diodes, wherein the light emitting diodes of a circuit branch are in each case interconnected in series with one another and the circuit branches are connected in parallel with one another, wherein
a first number of light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) of a circuit branch are fitted on a front side of the printed circuit board and a second number of light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) of the same circuit branch are fitted on a rear side of the printed circuit board.

2 . The printed circuit board as claimed in claim 1 , wherein the light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) of a circuit branch are of the same type, wherein the light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 LD 55 , LD 61 , LD 65 ) of the first number have a different voltage bin than the light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) of the second number.

3 . The printed circuit board as claimed in claim 1 , wherein the number of light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) which are fitted on the front side of the printed circuit board is not equal to the number of light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) which are fitted on the rear side.

4 . The printed circuit board as claimed in claim 3 , wherein the number of light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) which are fitted on the front side of the printed circuit board is greater than the number of light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) which are fitted on the rear side.

5 . The printed circuit board as claimed in claim 1 , wherein the ratio of the number of light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) which are fitted on the front side of the printed circuit board to the number of light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) which are fitted on the rear side is 4:1.

6 . The printed circuit board as claimed in claim 1 , wherein within a circuit branch a light emitting diode of the front side or a group of light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) of the front side is arranged alternately with a light emitting diode (LDi 11 , LDi 31 , LDi 52 ) of the rear side or a group of light emitting diodes of the rear side.

7 . The printed circuit board as claimed in claim 6 , wherein the groups of light emitting diodes (LD 11 , LD 15 ; LD 21 , LD 25 , LD 31 , LD 35 ; LD 41 , LD 45 , LD 51 , LD 55 ; LD 61 , LD 65 ) within a circuit branch comprise a different number of light emitting diodes, wherein the number is two or four.

8 . The printed circuit board as claimed in claim 6 , wherein individual light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) or groups of light emitting diodes can be bridged by means of zero-ohm resistors (R 11 , R 31 , R 52 ), wherein electrical contact areas for contacting the resistors (R 11 , R 31 , R 52 ) are provided for this purpose on the printed circuit board.

9 . The printed circuit board as claimed in claim 1 , wherein first groups of light emitting diodes (LD 11 -LD 18 ; LD 21 , LD 25 , LD 23 , LD 24 ) of circuit branches (1, 2, 3, 4) which have the same voltage potential are arranged in clusters for emitting their light into a common optical unit.

10 . The printed circuit board as claimed in claim 9 , wherein second groups of light emitting diodes (LD 22 , LD 26 , LD 24 , LD 28 ) of circuit branches which have a voltage potential which differs from the voltage potential of the first group (LD 21 , LD 25 , LD 23 , LD 24 ) substantially by the forward voltage of the light emitting diodes used are arranged jointly with light emitting diodes of the first group (LD 21 , LD 25 , LD 23 , LD 24 ) in clusters for emitting their light into a common optical unit.

11 . The printed circuit board as claimed in claim 1 , wherein the light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ; LDi 11 , LDi 31 , LDi 52 ) emit white light.

12 . The printed circuit board as claimed in claim 1 , wherein the light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) of the first number are 1-chip LEDs, and in that the light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) of the second number are 2-chip LEDs.

13 . A luminaire comprising at least one printed circuit board the at least one printed circuit board comprising a plurality of circuit branches having a multiplicity of light emitting diodes, wherein the light emitting diodes of a circuit branch are in each case interconnected in series with one another and the circuit branches are connected in parallel with one another, wherein
a first number of light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) of a circuit branch are fitted on a front side of the printed circuit board and a second number of light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) of the same circuit branch are fitted on a rear side of the printed circuit board.

14 . The luminaire as claimed in claim 13 , wherein the luminaire is embodied as a surface-mounted or pendant luminaire, wherein the light of the first number of light emitting diodes (LD 11 , LD 15 , LD 21 , LD 25 , LD 31 , LD 35 , LD 41 , LD 45 , LD 51 , LD 55 , LD 61 , LD 65 ) serves for direct lighting and the light of the second number of light emitting diodes (LDi 11 , LDi 31 , LDi 52 ) serves for direct lighting.

Assignees

• Zumtobel Lighting Gmbh

Inventors

• Pohs Mario

Classifications

• H05K1/18

  structurally associated with non-printed electric components (H05K1/16 takes precedence) · CPC title

• F21V7/0008

  providing for indirect lighting · CPC title

• F21V13/04

  the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)} · CPC title

• F21S4/28

  rigid, e.g. LED bars · CPC title

• F21Y2105/10

  comprising a two-dimensional [2D] array of point-like light-generating elements · CPC title