| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce an occurrence of a noise radio wave, and to prevent a malfunction of an apparatus arranged in a periphery. <P>SOLUTION: A heatsink 4 made from aluminum is arranged and provided inside a tube 1. Right and left two sheets of printed boards 5 are provided on the heatsink 4. Each printed board 5 is supported to the heatsink 4 with a screw 6 for fixing. Shield patterns 7 consisting of a coating layer of conductive paste are printed on front surfaces of the printed boards 5. About ten odd LEDs 8a to 8n are mounted on the front surfaces of the printed boards 5. Terminals of the LEDs 8a to 8n are exposed to back faces of the printed boards 5 through through-holes 9. The LEDs 8a to 8n are arranged so that polarities thereof differ for every two adjacent LEDs. With respect to wirings 10a to 10n connecting each of the LEDs 8a to 8n exposed to the back faces of the printed boards 5, since an outward side and a return side are arranged in turn in the shape of a chain alternately, electric fields generated by currents flowing through each wiring part are canceled by each other. <P>COPYRIGHT: (C)2011,JPO&INPIT |
