Patent ID: 8450915

Claim:
An LED bulb comprising: an LED module; a plurality of LEDs mounted on a surface of the LED module; a heat dissipating unit having the LED module mounted thereon and configured to dissipate heat generated by the LEDs, the heat dissipating unit comprising a surface; a globe-shaped cover covering the LED module and configured to externally pass through radiant light from the LEDs, the globe-shaped cover comprising an outer surface at a side adjacent to the heat dissipating unit; a cap arranged on a side of the heat dissipating unit opposite to the globe-shaped cover, the cap comprising an inner hollow portion; a lighting circuit disposed in the inner hollow portion of the cap, wherein the lighting circuit is configured to light the LEDs; and a constricted portion provided at a junction between the heat dissipating unit and the globe-shaped cover and formed by the outer surface of the globe-shaped cover and a surface of a portion of the heat dissipating unit disposed outside of and adjacent to the globe-shaped cover such that both the outer surface of the globe-shaped cover and the surface of the portion of the heat dissipating unit have a reduced diameter compared to at least one other portion of the outer surface of the globe-shaped cover and at least one other portion of the surface of the heat dissipating unit, and wherein a diameter of a widest portion of the heat dissipating unit is greater than a diameter of the portion of the heat dissipating unit disposed outside of the globe-shaped cover and forming the junction.