Patent ID: 8847251

Claim:
A substrate on which a plurality of semiconductor light-emitting elements are to be linearly mounted to form an element row, the substrate comprising: a first line and a second line which are disposed such that the element row is interposed therebetween, wherein the first line includes a first main line portion extending mainly in a row direction of the element row, and a first connecting portion connected to the first main line portion and including a portion for connecting to a corresponding one of the semiconductor light-emitting elements, the second line includes a second main line portion extending mainly in the row direction of the element row, and a second connecting portion connected to the second main line portion and including a portion for connecting to a corresponding one of the semiconductor light-emitting elements, and a gap between the first main line portion and the second main line portion has a maximum size at element mounting positions, at which the semiconductor light-emitting elements are to be mounted, wherein the first line includes a plurality of the first connecting portions, the second line includes a plurality of the second connecting portions, and the first connecting portions, the second connecting portions and the semiconductor light-emitting elements are alternately positioned in an aligned direction of the semiconductor light-emitting elements.