Card-type LED illumination source
An LED illumination apparatus includes at least one connector and a lighting drive circuit. The connector is connected to an insertable and removable card-type LED illumination source, which includes multiple LEDs that have been mounted on one surface of a substrate. The lighting drive circuit is electrically connected to the card-type LED illumination source by way of the connector. The card-type LED illumination source preferably includes a metal base substrate and the multiple LEDs that have been mounted on one surface of the metal base substrate. The back surface of the metal base substrate, including no LEDs thereon, thermally contacts with a portion of the illumination apparatus. A feeder terminal to be electrically connected to the connector is provided on the surface of the metal base substrate on which the LEDs are provided.
1. An LED illumination source comprising:
at least one LED bare chip, and
a heat-dissipating substrate on which the LED bare chip is flip-chip bonded, the substrate comprising at least one conductive line pattern layer and an insulating layer being made of a composite material including at least an inorganic filler and a resin composition, wherein the conductive line pattern layer has a copper layer, a nickel layer which is plated to the copper layer, and a gold layer which is plated to the nickel layer, the gold layer having a thickness of at least 0.5 μm and being connected to an electrode of the LED bare chip by way of a gold bump wherein the heat dissipating substrate has a metal base, a thermal resistance between the metal base and the LED being 10° C./W or less.
2. The LED illumination source of claim 1 , wherein a light emitting portion of the LED bare chip is provided on the heat-dissipating substrate, and wherein a light outgoing facet of a chip substrate of the LED bare chip defines a slope such that a peripheral portion thereof is less tall than a center portion thereof, the light outgoing facet having a fiat top portion.
3. The LED illumination source of claim 2 , wherein the LED bare chip is provided as either a surface mount device (SMD) or a chip element.
4. The LED illumination source of claim 2 , wherein the light emitting portion comprises a GaN based semiconductor layer.
5. The LED illumination source of claim 1 , wherein the LED bare chip is provided as either a surface mount device (SMD) or a chip element.
6. The LED illumination source of claim 1 , wherein the light emitting portion comprises a GaN based semiconductor layer.
7. The LED illumination source of claim 1 , wherein the thermal resistance between the metal base and the LED is 5° C./W or less.
8. The LED illumination source of claim 7 , wherein the thermal resistance between the metal base and the LED is 2° C./W or less.
9. The LED illumination source of claim 1 , wherein the inorganic filler is at least one filler selected from the group consisting of Al 2 O 3 , MgO, BN, SiO 2 , SiC, Si 3 N 4 and AlN.