| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat radiator of a bulb type light emitting diode illumination lamp which efficiently suppresses a temperature increase of an LED in spite of a simple structure, and reduces a manufacturing cost by forming the heat radiator, with a plurality of projection fins formed on an outer circumference, of a metal plate. <P>SOLUTION: The heat radiator 1 is interposed between a base 4 of a bulb arranged on a base end side 1a and a printed wiring board 5 arranged on an open end side 1b and having the LED 6 mounted thereon. The heat radiator 1 includes the plurality of projection fins 2 formed by meandering and bending the metal plate with good thermal conductivity on the outer circumference, and a housing part 3, which is arranged on an inner circumference and houses a power source part for generating power of the LED 6. The plurality of projection fins 2 formed by meandering and bending the metal plate 13 are formed to project so that a height from the housing part 3 increases gradually from the base end side 1a to the open end side 1b. An end surface of the open end side 1b of the projection fins 2 is formed in a plane surface so that a rear surface side of the metal printed wiring board 5 is surface-joined. <P>COPYRIGHT: (C)2011,JPO&INPIT |
