Varistor and light-emitting apparatus

Abstract

A varistor comprises a varistor element body, first and second inner electrodes opposing each other, a first outer electrode connected to the first inner electrode physically and electrically, a second outer electrode connected to the second inner electrode physically and electrically, and an electrically insulating layer. The first and second inner electrodes are arranged within the varistor element body so as to have end portions exposed at two outer surfaces of the varistor element body. The first outer electrode is arranged on one of the two outer surfaces so as to cover a portion of the end portion of the first inner electrode exposed at the one outer surface. The second outer electrode is arranged on the one outer surface so as to cover a portion of the end portion of the second inner electrode exposed at the one outer surface. The electrically insulating layer is arranged on the one outer surface so as to cover a portion exposed from the first outer electrode in the end portion of the first inner electrode and a portion exposed from the second outer electrode in the end portion of the second inner electrode.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view showing a varistor in accordance with an embodiment;

FIG. 2 is a schematic plan view showing the varistor in accordance with the embodiment;

FIG. 3 is a schematic plan view showing the varistor in accordance with the embodiment;

FIG. 4 is a schematic view for explaining a cross-sectional configuration of the varistor in accordance with the embodiment;

FIG. 5 is a schematic view showing a cross-sectional configuration taken along the line V-V of FIG. 2;

FIG. 6 is a schematic view for explaining a cross-sectional configuration of the varistor in accordance with the embodiment;

FIG. 7 is a schematic view for explaining a cross-sectional configuration of the varistor in accordance with the embodiment;

FIG. 8 is a flowchart showing a procedure of manufacturing the varistor in accordance with the embodiment;

FIG. 9 is a schematic perspective view showing steps of manufacturing the varistor in accordance with the embodiment;

FIG. 10 is a schematic perspective view showing steps of manufacturing the varistor in accordance with the embodiment;

FIG. 11 is a schematic perspective view for explaining a cross-sectional configuration of a light-emitting apparatus in accordance with an embodiment; and

FIG. 12 is a schematic perspective view for explaining a cross-sectional configuration of the light-emitting apparatus in accordance with the embodiment.

Claims

1. A varistor comprising: a varistor element body;first and second inner electrodes arranged within the varistor element body so as to oppose each other and have end portions exposed at two outer surfaces of the varistor element body;a first outer electrode arranged on one of the two outer surfaces so as to cover a portion of the end portion of the first inner electrode exposed at the one outer surface while being physically and electrically connected to the first inner electrode;a second outer electrode arranged on the one outer surface so as to cover a portion of the end portion of the second inner electrode exposed at the one outer surface while being physically and electrically connected to the second inner electrode; andan electrically insulating layer arranged on the one outer surface so as to cover a portion exposed from the first outer electrode in the end portion of the first inner electrode and a portion exposed from the second outer electrode in the end portion of the second inner electrode.

2. A varistor according to claim 1, wherein a plurality of first electrodes and a plurality of second electrodes are arranged alternately within the varistor element body; wherein the first outer electrode is arranged so as to extend over a plurality of the first inner electrodes and is connected thereto physically and electrically; andwherein the second outer electrode is arranged so as to extend over a plurality of the second inner electrodes and is connected thereto physically and electrically.

3. A varistor according to claim 1, further comprising: a third outer electrode arranged on the other of the two outer surfaces so as to cover a portion of the end portion of the first inner electrode exposed at the other outer surface while being physically and electrically connected to the first inner electrode;a fourth outer electrode arranged on the other of the two outer surfaces so as to cover a portion of the end portion of the second inner electrode exposed at the other outer surface while being physically and electrically connected to the second inner electrode; andan electrically insulating layer arranged on the other outer surface so as to cover a portion exposed from the third outer electrode in the end portion of the first inner electrode and a portion exposed from the fourth outer electrode in the end portion of the second inner electrode.

4. A varistor according to claim 3, wherein a plurality of first electrodes and a plurality of second electrodes are arranged alternately within the varistor element body; wherein the first and third outer electrodes are arranged so as to extend over a plurality of the first inner electrodes and are connected thereto physically and electrically; andwherein the second and fourth outer electrodes are arranged so as to extend over a plurality of the second inner electrodes and are connected thereto physically and electrically.

5. A varistor according to claim 1, wherein the two outer surfaces oppose each other.

6. A light-emitting apparatus comprising a semiconductor light-emitting device and a varistor, the varistor comprising: a varistor element body;first and second inner electrodes arranged within the varistor element body so as to oppose each other and have end portions exposed at two outer surfaces of the varistor element body;a first outer electrode arranged on one of the two outer surfaces so as to cover a portion of the end portion of the first inner electrode exposed at the one outer surface while being physically and electrically connected to the first inner electrode;a second outer electrode arranged on the one outer surface so as to cover a portion of the end portion of the second inner electrode exposed at the one outer surface while being physically and electrically connected to the second inner electrode; andan electrically insulating layer arranged on the one outer surface so as to cover a portion exposed from the first outer electrode in the end portion of the first inner electrode and a portion exposed from the second outer electrode in the end portion of the second inner electrode;wherein the semiconductor light-emitting device is connected to the first and second outer electrodes physically and electrically so as to be connected in parallel to the varistor.