Patent ID: 8330181

Claim:
A semiconductor light-emitting device, comprising: a substrate having long sides and short sides defining a rectangular shape in a plan view, and having first and second center lines that are respectively parallel to the short and long sides in the plan view; a semiconductor layer including a first conduction-type semiconductor layer, a light-emitting layer, and a second conduction-type semiconductor layer, and formed on the substrate; a first pad electrode electrically connected to an upper surface of the first conduction-type semiconductor layer; and a second pad electrode electrically connected to an upper surface of the second conduction-type semiconductor layer, wherein a first connection surface of the first pad electrode, located on one side of said first center line of the substrate, is electrically connected to the first conduction-type semiconductor layer, a second connection surface of the second pad electrode, located on a side of said first center line opposite to said one side, being electrically connected to the second conduction-type semiconductor layer, the first connection surface of the first pad electrode and the second connection surface of the second pad electrode are rectangular with longer sides extending in the direction of the short sides of the substrate in a plan view, the second pad electrode has a rectangular first surface, defined by long and short sides and having a first area, as measured in the plan view of the substrate, and the second connection surface has a second area as measured in the plan view, that is smaller than the first area, the long sides of said first surface extending in the same direction as the long sides of the substrate and across said first center line, and the short sides of said first surface extending in the same direction as the short sides of the substrate and across said second center line, and a printed board is mounted on the first surface of the second pad electrode.