Patent ID: 7637045
Filing Date: 2009-12-29
Classification: G09F,Y10S

Abstract:
1. A surface light source, comprising: a plurality of surface light source units arranged side-by-side; and a single light diffusion member covering the plurality of surface light source units, wherein each surface light source unit of the plurality of surface light source units comprises: a box body having a tray shape, a bottom surface that is quadrilateral, an upper side that is open, side walls that are inclined outward, an inner surface, and four corners; a light reflection member provided on the inner surface of the box body; a circuit board that is provided at the lower part of the bottom surface of respective box bodies and that has a size that is smaller than the external size of an opening end portion of the respective box bodies and larger than the bottom surface of the respective box bodies; through-holes formed in each corner of the four corners of the box body at lower parts of the side walls; and four dome-type semiconductor light emitting devices that are each inserted into respective through-holes, that each have a dome part positioned within the box body, that each have a lead part positioned outside the box body and inside the outer shape of the opening end portion of the box body and connected with the circuit board, that each have directionality characteristics of irradiation ranging from 45 to 60 degrees, and that each mainly irradiate a region of the box body (a) that is a half space, (b) that is a rotationally symmetrical space between a vertical plane on a diagonal line of the bottom surface of the box body and the side walls, and (c) that is overlappingly irradiated by two dome-type semiconductor light emitting devices of the four dome-type semiconductor light emitting devices, so that the four dome-type semiconductor light emitting devices cooperate to irradiate the space within the box body with mixed light, wherein the plurality of surface light source units are arranged without the circuit boards of the adjacent surface light source units touching each other and with the opening end portions of the box bodies of the adjacent surface light source units being brought into close contact with each other.