LIGHT SOURCE UNIT

摘要

[Purpose] To provide a light source unit that includes a plurality of LED elements disposed on a plurality of band-shaped wirings on a substrate. The LED elements on one band-shaped wiring are electrically connected by wires to an adjacent band-shaped wiring. The LED elements are disposed on the substrate in a staggered arrangement as a whole. The LED elements can be densely disposed without poor connection occurring in the wires connected to the band-shaped wirings, and effective cooling can be carried out without impeding the dissipation of heat from the LED elements. [Solution] One or more damming channels are formed between each two adjacent LED elements on each band-shaped wiring. A non-effusion region is formed, into which no solder flows, between each two adjacent LED elements. The wires are connected to the non-effusion regions. Each band-shaped wiring has wide parts and narrow parts in the wiring direction. The LED elements are disposed on the wide parts of the band-shaped wirings.