| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LED lighting device securing sufficient withstand voltage, having high heat radiation properties, and capable of reducing noise emission. <P>SOLUTION: A wiring board 24 is provided with a base material 24a with insulation, a first conductive pattern 24b formed on nearly a whole surface of an upper surface side of the base material 24a, and a second conductive pattern 24c formed on nearly a whole surface of a lower surface side of the base material 24a. A part of the first conductive pattern 24b is to be a circuit wiring for connecting three LEDs, a thickness of the base material 24a is formed in 1 mm or more, a creeping distance L between the first conductive pattern 24b and a heat sink 11 is set at 6 mm or more, the second conductive pattern 24c is electrically connected and in contact with the heat sink 11, the heat sink 11 is connected to a ground of an power source circuit board 17, and parasitic capacitance is formed by the first conductive pattern 24b and the second conductive pattern 24c. <P>COPYRIGHT: (C)2013,JPO&INPIT |
