| 摘要 |
PURPOSE: A lighting device is provided to vary an illuminated area by easily diversifying the lighting angle of a lighting part. CONSTITUTION: A lighting device comprises a heat pipe(100), a lighting part, and a power supply part. The heat pipe comprises a pipe main body(110), an inner pipe(120), a wick, and a working fluid. The pipe main body forms the outer pipe of the heat pipe. The pipe main body has a sufficient compressive strength. The wick is formed in the inner circumference of the pipe main body. The wick returns a liquid working fluid which is condensed in a condensing area to a vaporizing area by a capillary phenomenon. |
