Abstract: A light-emitting panel of the present invention has a LED, a surface light-emitting member, a light source holder, and a holder supporting portion. The surface light-emitting member has a rectangular plate shape and at least one surface of front and back surfaces is surface-emitted by entering light from the light source into an incident edge. The light source holder holds the LED such that a light exit of the light source is arranged toward the incident edge. The holder supporting portion is fixed to the surface light-emitting member and hold detachably the light source holder. The light-emitting panel of the present invention can reduce effects of the light source due to thermal expansion of the surface light-emitting member, and easily replace the light source.

Abstract: A large area light source includes a narrow space of several millimeters long arranged between adjacent ends of circuit boards of LED bars that are arranged in series in their longitudinal direction, and one end or both ends of a connecting pin is attached movable in its longitudinal direction to a coupling terminal arranged on an end of the circuit board of the LED bar, the LED bar is attached movable in its longitudinal direction to its holder. Even if deformation of distortion, bending, or strain is induced by transportation, installation, or use of the area light source, the movable LED bar as well as the connecting pin absorbs expansion and contraction stress working between the adjacent ends of the circuit boards to securely prevent such breaking of wire incurred by use of a plurality of divided LED bars.

Abstract: A light source receiver 31 is disposed adjacent to an incident end face 11 of a light guiding plate 1 using the light source holder 31 for receiving the LED unit 4 and a light source holder 3 formed in an L-shape in a cross section having a standing plate 34 at one end of the light source holder 31, the standing plate 34 is disposed outside of a reflective plate 2 laminated on the light guiding plate 1, and a bolt 81 via a long hole 35 of the standing plate 34 is screwed into an insert-nut 8 of the light guiding plate 1 via a clearance hole 21 of the reflective plate 2, thereby the standing plate 34 follows the heat expansion or contraction of the light guiding plate 1 except the reflective plate 2. A relative position between the incident end face 11 of the light guiding plate 1 and the light source receiver 31 of the light source holder 3 is always constant, and the LED unit 4 is prevented from being damaged.