| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LED lighting device having a cylindrical or circular shape compatible with the specification of a fluorescent lamp lighting system, and capable of securing sufficient illuminance and product life by having sufficient heat radiation efficiency. <P>SOLUTION: In the LED lighting device, the shape of a peripheral edge is a cylindrical shape compatible with a fluorescent lamp lighting device, and a plurality of LEDs are arranged as light emitting sources. The peripheral edge is divided into a first outer surface and a second outer surface, and a heat radiation part constituting the first outer surface has a mounting surface having the LEDs mounted in its inside. A light-permeable part constituting the second outer surface covers the mounting surface for mounting the LEDs thereon. Thereby, since the shape of the peripheral edge of the LED lighting device constitutes the heat radiation part in addition to having a shape compatible with the fluorescent lamp lighting device, sufficient heat radiation performance is secured. Thereby, temperature rise of the LED lighting device can be suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT |
