Light-emitting device and lighting device provided with the same
A light-emitting device capable of ensuring an electric connection between a light-emitting element and an electrode without generating any problem in practical use, by both connecting methods with a solder and a connector, and a lighting device provided with the light-emitting device are provided. The light-emitting device according to the present invention has a plurality of LED chips, and a soldering electrode land and a connector connecting electrode land electrically connected to the chips, on a ceramic substrate. The soldering electrode land is formed of a first conductive material having a function to prevent diffusion to a solder, and the connector connecting electrode land is formed of a second conductive material having a function to prevent oxidation.
1. A light-emitting device comprising:
a light-emitting part, and a soldering electrode land and a connector connecting electrode land each electrically connected to the light-emitting part for an external connection, on a substrate, wherein
the soldering electrode land is formed of a first conductive material having a function to prevent diffusion to a solder, and
the connector connecting electrode land is formed of a second conductive material having a function to prevent oxidation.
2. The light-emitting device according to claim 1 , wherein
the soldering electrode land has an uppermost surface made of the first conductive material, and
the connector connecting electrode land has an uppermost surface made of the second conductive material.
3. The light-emitting device according to claim 1 , wherein the first conductive material includes any one of Ag, Ag—Pt and Ag—Pd.
4. The light-emitting device according to claim 1 , wherein the second conductive material includes Au.
5. The light-emitting device according to claim 1 , wherein
the soldering electrode land includes a pair of a first soldering electrode land connected to an anode, and a second soldering electrode land connected to a cathode, and
the connector connecting electrode land includes a pair of a first connector connecting electrode land connected to the anode and a second connector connecting electrode land connected to the cathode.
6. The light-emitting device according to claim 5 , wherein
the substrate has a rectangular shape, and
at least one of the pair of the first soldering electrode land and the second soldering electrode land and the pair of the first connector connecting electrode land and the second connector connecting electrode land is arranged at corners of the substrate so as to be diagonally opposed to each other on the substrate.
7. The light-emitting device according to claim 5 , wherein
the substrate has a rectangular shape,
the first soldering electrode land and the second soldering electrode land are arranged at corners of the substrate so as to be diagonally opposed to each other on the substrate, and
the first connector connecting electrode land and the second connector connecting electrode land are arranged at corners of the substrate so as to be diagonally opposed to each other on the substrate.
8. The light-emitting device according to claim 5 , wherein
a first wiring pattern connected to the anode, and a second wiring pattern connected to the cathode are arranged so as to be opposed to each other on the substrate, and
the light-emitting part is electrically connected to the first soldering electrode land and the first connector connecting electrode land through the first wiring pattern, and electrically connected to the second soldering electrode land and the second connector connecting electrode land through the second wiring pattern.
9. The light-emitting device according to claim 8 , wherein
the first wiring pattern and the second wiring pattern have respective arc shapes each constituting a part of a same circular ring, and
the light-emitting part is covered with a sealing body filled in the circular ring.
10. The light-emitting device according to claim 9 , further comprising:
a printing resistive element having one end connected to one end of the first wiring pattern, and having the other end connected to one end of the second wiring pattern, wherein
the printing resistive element has an arc shape constituting a part of the circular ring.
11. A lighting device comprising:
the light-emitting device according to claim 1 , and a connector jig, wherein
the connector jig includes a resin plate having a light-emitting surface opening, and a connector terminal opening to be penetrated by a connector terminal, and
the light-emitting device and the connector jig are overlapped in such a manner that the light-emitting part is exposed in the light-emitting surface opening, and the connector connecting electrode land and the connector terminal opening are opposed to each other.
12. The lighting device according to claim 11 , wherein
an outer periphery of the connector jig does not protrude from an outer periphery of the light-emitting device when viewed from a direction perpendicular to an overlapped surface of the light-emitting device and the connector jig.