| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve on radiation of radiating fins for releasing heat from LEDs. <P>SOLUTION: A plurality of flat-plate radiating fins 23 are radially arrayed with a predetermined interval at an outer periphery face of a casing 20 having arranged at an underside an LED aluminum substrate 40 mounting a plurality of light-emitting diodes 42. An outer diameter of the lower part of an outer edge part in a radial direction of the radiating fin 23 is to be formed larger than an outer diameter of a lower part of the casing 20. A venthole 63 each enabled to circulate air is formed outside a bottom part of a space part 62 formed between each two adjacent radiating fins 23, 23. As air flows in through the ventholes 63, flow of air inside the space parts 62 can be made smooth. With this, radiation of the radiating fins 23 can be improved. <P>COPYRIGHT: (C)2013,JPO&INPIT |
