US Patent 7946737 LED illumination device and light engine thereof

An LED illumination device includes an optical section, an electrical section, and a heat dissipation section provided with a heat dissipation device. The heat dissipation device includes a hollow metal tube, a plurality of metal fins extending from the metal tube, a bottom cover plate and a top cover plate respectively sealing a bottom and a top of the metal tube, and a tubular member received in the metal tube and axially defining a vapor passage channel therethrough. A condensing chamber is defined between the metal tube and the tubular member. An evaporating chamber is defined between the bottom of the tubular member and the bottom cover plate. A vapor chamber is defined between the top of the tubular member and the top cover plate. A porous wick is received in the evaporating chamber and attached to the bottom cover plate. A working fluid is saturated in the porous wick.