Patent ID: 8174033

Claim:
A light emission device comprising: a plurality of semiconductor light emitting elements each having a substantially rectangular shape which has a first side, a second side, and an other side, wherein the second side and the other side are different from and adjacent to the first side, wherein the other side is opposite to the second side, light emitted from a first element end face on the first side being stronger than light emitted from a second element end face on the second side, each of the plurality of semiconductor light emitting elements comprising: a transparent substrate; a first semiconductor layer of a first conductive type provided on the transparent substrate; a second semiconductor layer of a second conductive type provided on the first semiconductor layer; a first electrode provided on an exposure part of the first semiconductor layer; and a second electrode provided on the second semiconductor layer; and a supporting substrate on which the plurality of semiconductor light emitting elements are flip-chip mounted, wherein each first side of each of the plurality of semiconductor light emitting elements faces each other substantially in parallel, wherein the second side and the other side do not face an adjacent semiconductor light emitting element, wherein the first electrode is an n electrode and the second electrode is a p electrode, wherein, when viewed from the first side, each of the plurality of semiconductor light emitting elements includes a cross-section parallel to the first side that consecutively alternates between the p electrode and the n electrode a plurality of times such that both ends of the first side are a p electrode, wherein a ratio R 1 /L 1 of R 1 to L 1 is smaller than a ratio R 2 /L 2 of R 2 to L 2 , wherein R 1 is an area of a first region on the second electrode, the first region being defined by a group of first hypothetical lines extending on the second electrode perpendicularly to the first side from endpoints located at the first side or at locations closest to the first side to endpoints located at either one of a third side of each of the plurality of semiconductor light emitting elements opposite to the first side or a first exposure side of the exposure part of the first semiconductor layer whichever the first hypothetical lines on the second electrode first reach, wherein L 1 is a length of the first side, wherein R 2 is an area of a second region on the second electrode, the second region being defined by a group of second hypothetical lines extending on the second electrode perpendicularly to the second side from endpoints located at the second side or at locations closest to the second side to endpoints located at either one of the other side defined as a fourth side of each of the plurality of semiconductor light emitting elements opposite to the second side or a second exposure side of the exposure part of the first semiconductor layer whichever the second hypothetical lines on the second electrode first reach, and wherein L 2 is a length of the second side.