发明人：
CHRISTANTO, ANDREW | LI, HANG | ZHANG, HAO | MIAO, WEIHUA | LI, SHENG, FENG | CANNELL, ASHLEY | GATES, RYAN, ROBERT, JAMES
摘要：
A lighting strip has a printed circuit board with one or more perforated lines at which the printed circuit board length may be adjusted by breaking off an end portion of the printed circuit board. A first layer has a first set of conductive tracks and a second layer has a second set of conductive tracks corresponding to the first set of conductive tracks. Each conductive track of the second set is vertically aligned and positioned over the corresponding conductive track of the first set. An array of contact terminals is provided on a third layer. A plurality of lighting elements is disposed along the lighting strip, each electrically connected to a respective pair of the contact terminals. The lighting strip further comprises a set of vias connecting each conductive track of the first set to the corresponding conductive track of the second set.
技术问题语段：
However, when narrow lighting strips are formed using a printed circuit board, there can be insufficient space on the printed circuit board for the conductive tracks needed to supply power to the SSL elements.|At present, single layer printed circuit boards below 20mm in width are not available for multi-channel solutions.|These bridges can obstruct the use of secondary optics such as light guides and lenses.|The joints of light strips usually involves multiple connectors and they can also obstruct the use of secondary optics.|The problems of high resistance caused by narrow conductive tracks and by long conductive tracks thus compound.
技术功效语段：
[0011]The lighting strip further comprises a set of vias connecting each conductive track of the first set to the corresponding conductive track of the second set. The conductive tracks are thus coupled in pairs to reduce the resistance.
[0026]The lighting strip may further comprise a current driver circuit for delivering current to the lighting elements from one end of the printed circuit board. The multiple conductive tracks enable the current to be more equally distributed between the lighting elements.
权利要求：
1. A lighting strip, comprising: a strip-shaped printed circuit board which includes: a first layer (10) having a first set of conductive tracks (12); a second layer (20) provided over the first layer, having a second set of conductive tracks (22) corresponding to the first set of conductive tracks; and a third layer (30) provided over the second layer, having an array of contact terminals (60, 62, 64); and a plurality of lighting elements (50, 52) disposed along the lighting strip, each electrically connected to a respective pair of the contact terminals; wherein the lighting strip comprises a set of vias (64, 65) connecting each conductive track of the first set to the corresponding conductive track of the second set, characterized in that the strip-shaped printed circuit board further includes one or more perforated lines (40) at which the printed circuit board length may be adjusted by breaking off an end portion of the printed circuit board, and in that each conductive track of the second set is vertically aligned and positioned over the corresponding conductive track of the first set.
2. The lighting strip of claim 1, wherein each conductive track of the second set is positioned over the corresponding conductive track of the first set over its full length.
3. The lighting strip of claim 1 or 2, wherein the lighting elements (50, 52) are grouped into a plurality of channels, each channel being associated with a first conductive track which functions as a high supply line and a second conductive track which functions as a low supply line, on each of the first and second layers (10, 20).
4. The lighting strip of claim 3, comprising two channels of lighting elements, a first channel comprising warm white lighting elements (50) and a second channel comprising cool white lighting elements (52).
5. The lighting strip of any one of claims 1 to 4, wherein the first and second layers (10, 20) have the same layout.
6. The lighting strip of any one of claims 1 to 5, wherein each lighting element (50, 52) comprises an LED or an array of LEDs.
7. The lighting strip of claim 1, wherein each via (64, 65) connects a lighting element terminal to an associated conductive track of each of the first and second sets.
8. The lighting strip of claim 7, wherein each lighting element (50, 52), or a series string of lighting elements, is connected by a first via (64) to first conductive tracks (12a, 22a) in each of the first and second layers, which function as a positive supply line and by a second via (65) to second conductive tracks (12b, 22b) in each of the first and second layers, which function as a negative supply line.
9. The lighting strip of any one of claims 1 to 8, wherein the vias (64, 65) are partial buried vias which terminate at the conductive tracks of the first layer.
10. The lighting strip of any one of claims 1 to 9, wherein the printed circuit board further comprises an insulating base layer (56) beneath the first layer.
11. The lighting strip of any one of claims 1 to 10, having a width less than 20mm, for example in the range width 8mm to 12mm.
12. The lighting strip of any one of claims 1 to 11, having a length more than 1000mm.
13. The lighting strip of any one of claims 1 to 12, further comprising a current driver circuit (70) for delivering a current to the lighting elements from one end of the printed circuit board.
14. The lighting strip of any one of claims 1 to 13, wherein the printed circuit board comprises a rigid printed circuit board.