| 摘要 |
FIELD: physics, optics.SUBSTANCE: invention relates to a pear-shaped light-emitting diode (LED) which provides efficient heat dissipation, preserves a compact size and a wider light radiation angle. The LED lighting device has a plurality of LEDs, having a metallic printed-circuit board on which a plurality of LEDs are mounted; a screw base; a heat dissipating device; and a bulb. The heat dissipating device has a main housing and a plurality of heat dissipating fins. The main housing has a cylindrical part, at the centre of which there is a cylindrical part with an open top, an annular flange which vertically protrudes from the bottom of the cylindrical part, and a protrusion whose diameter gradually decreases from the annular flange to the lower surface of the lighting device on which the plurality of LEDs are mounted. The heat dissipating fins have an inner vertical portion and a lower part connected to the cylindrical part and the flange of the main housing, respectively, and arranged radially upwards and downwards.EFFECT: efficient heat dissipation.14 cl, 7 dwg |
