Patent ID: 7442074

Claim:
A wiring board comprising: an insulating substrate; first and second feeding electrodes provided along both sides in a longitudinal direction of the insulating substrate; a plurality of feeding bus lines extending in a traverse direction of the insulating substrate and connected to at least one of the first and second feeding electrodes; a plurality of conductor wirings provided in each unit region defined by the feeding bus lines, one side terminals thereof forming inner leads and the other side terminals thereof being connected to the feeding bus lines; and a protruding electrode formed on each of the inner leads of the conductor wirings, wherein the inner leads belonging to each unit region form a first group and a second group arranged in two lines extending in the traverse direction of the insulating substrate, with tips of the inner leads of the first group and tips of the inner leads of the second group facing each other, and the inner leads of the first group are arranged with a dense wiring pitch, and the inner leads of the second group include a dense pitch region in which a wiring pitch thereof is the same as that of the inner leads of the first group and a sparse pitch region in which a wiring pitch thereof is longer than that of the inner leads of the first group, the feeding bus lines connect between the first feeding electrode and the second feeding electrode, the conductor wirings forming the inner leads of the first group and the inner leads in the dense pitch region of the second group are connected to the feeding bus line on one side of each unit region, and the conductor wirings forming the inner leads in the sparse pitch region of the second group are connected to the feeding bus line on the other side of each unit region.