| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus having a sufficient heat radiation effect and capable of preventing deterioration of a light-emitting element due to overheat. <P>SOLUTION: The lighting apparatus is provided with a bulb 1, a heat sink unit 2, a light-emitting means 3, an annular cover 5, and a power source connecting means 6. The heat sink unit 2 has an end wall 212 which has a first end face 214 to face the closing end 12 of a bulb 1 and a second end face 215 to face the opening end 11 of the bulb 1 and a surrounding wall 221 which is arranged so that one end may be at one side of the end wall 212 and the other end may be at the opening end 11 side of the bulb 1. The light-emitting means has a first circuit board 31 which is installed at the first end face 214, a second circuit board 32 which is installed at an outer circumferential face 222, and a plurality of light-emitting elements 33. A heat insulation means 4 is interposed at least at either of the spacing between the first end face 214 and the first circuit board 31 or the spacing between the surrounding wall 221 and the second circuit board 32. <P>COPYRIGHT: (C)2013,JPO&INPIT |
