| 摘要 |
A large area light source includes a narrow space (23) of several millimeters long arranged between adjacent ends of circuit boards of LED bars (2) 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 (25a) arranged on an end of the circuit board of the LED bar, the LED bar (2) 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 (24) 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 (2). |
