Patent ID: 7982230

Claim:
A substrate for mounting light emitting elements, comprising: an enameled substrate in which a surface of a core metal is covered with an enamel layer; two or more conductive layers formed on an outer surface of the enameled substrate; and an insulating layer provided between every two of the conductive layers, wherein the conductive layers extend along a longitudinal direction of the enameled substrate from a first end to a second end such that the conductive layers feed power to a plurality of light emitting elements mounted along the longitudinal direction of the enameled substrate, and such that the conductive layers form a laminate structure together with the insulating layer sandwiched therebetween; wherein the first and second end of the enameled substrate have at least one protruding section, wherein a first one of the conductive layers extends on a surface of a respective protruding section provided at each of the first and second ends of the enameled substrate to connect with another substrate, wherein a first portion of a second one of the conductive layers, on which the light emitting elements are mounted, is directly formed on the enamel layer which covers the surface of the core metal, and wherein a second portion of the second one of the conductive layers is mounted on top of the first one of the conductive layers via the insulating layer.