| 摘要 |
PROBLEM TO BE SOLVED: To provide an LED bulb which does not damage uniformity of luminance of a globe surface while brightness in a top part direction and brightness in a base direction of a globe can be set substantially independently.SOLUTION: In an LED bulb 10, an annular reflection member 16 for a back surface and a cone-shaped reflection member 17 for a lateral surface are laminated with a certain space at an upper part of an LED light source 15. A beam L1 emitted from a peripheral part of the LED light source 15 obliquely upward and reflected at the reflection member 16 for a back surface heads toward a base direction. On the other hand, in a beam emitted from the LED light source 15 and trying to escape from a lower side of the reflection member 17 for a lateral surface, one part (beams L4, L5) heads obliquely upward and the other part (beam L2) is reflected at the reflection member 17 for a lateral surface and heads toward the lateral side. Furthermore, a beam L3 emitted upward from a central part of the LED light source 15 passes through a through-hole of the reflection member 17 for a lateral surface and heads upward. |
