| 摘要 |
<P>PROBLEM TO BE SOLVED: To satisfy both high density mounting and improvement of light emission efficiency of an LED element. <P>SOLUTION: The LED light source unit 1 is fixed in respective side faces of polygonal columnar or polygonal cylindrical support members and constitutes a bulb type LED light source. In a plurality of LED elements 5, mutually opposing and adjacent side faces are deviated by approximately 50% in their direction, and they are arranged on a rectangular solid shaped base 3 composed of a metal of high heat conductivity such as copper in a zig-zag state. A single-sided printed circuit board 4 having a long hole 4a at the center and wiring patterns 4b, 4c on both sides is joined on the base 3. Wires 6, 7 connect respective electrodes of the LED element 5 and the wiring patterns 4b, 4c. A translucent sealing resin 8 covers the printed circuit board 4 except both end parts of the wiring patterns 4b, 4c and protects the LED element 5 and the wires 6, 7. A spacing A in the periphery of the LED element 5 is a distance in which there is no influence on extraction efficiency of light by adjacent wall faces, and a spacing B adjacent to each other is of an implementable minimum distance. <P>COPYRIGHT: (C)2007,JPO&INPIT |
