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 substrate;
a light-emitting part formed on the substrate;
a sealing body to cover the light-emitting part;
a first wiring pattern formed on the substrate, the first wiring pattern being used for an anode-side connection; and
a second wiring pattern formed on the substrate, the second wiring pattern being used for a cathode-side connection, wherein
the light-emitting part includes a plurality of LED chips arranged in at least two LED rows including a first row and a second row, the number of the LED chips in the first row being smaller than that in the second row,
a plurality of series circuits, each of which is composed of the same number of the LED chips connected in series as the others, are formed, each of the series circuits having one end connected to the first wiring pattern and the other end connected to the second wiring pattern, and
at least one of the series circuits has a portion where an electric connection is made between one of the LED chips in the first row and one of the LED chips in a row adjacent to the first row.
2. The light-emitting device of claim 1 , wherein
the first wiring pattern and the second wiring pattern are formed in a periphery of the light-emitting part on the substrate, respectively,
the first wiring pattern electrically connects to a land being used for an anode-side external electric connection, and
the second wiring pattern electrically connects to another land being used for a cathode-side external electric connection.
3. The light-emitting device of claim 1 , wherein
the first wiring pattern and the second wiring pattern are arranged so as to be opposed to each other on the substrate.
4. The light-emitting device of claim 1 , further comprising a resin dam formed so as to surround the light-emitting part, wherein
the sealing body is filled inside the resin dam.
5. The light-emitting device of claim 4 , wherein
the resin dam has a circular ring shape.
6. The light-emitting device of claim 5 , wherein
the first wiring pattern and the second wiring pattern have respective arc shapes each constituting a part of the circular ring.
7. The light-emitting device of claim 4 , further comprising at least one first wire and at least one second wire, wherein
one end of each of the series circuits and the first wiring pattern are connected through the first wire,
the other end of each of the series circuits and the second wiring pattern are connected through the second wire, and
the resin dam is formed so as to cover a part of the first wire, a part of the second wire, the first wiring pattern, and the second wiring pattern.
8. The light-emitting device of claim 4 , further comprising a protection element arranged under the resin dam.
9. The light-emitting device of claim 1 , wherein the sealing body is composed of a phosphor containing resin.
10. The light-emitting device of claim 1 , wherein an outline of a plurality of the LED rows constituting the light-emitting part is substantially similar in shape as an outline of the sealing body.