Patent ID: 8827509

Claim:
An LED lamp bulb, comprising a heat sink, a radiation fin set, an insulative lamp bulb base, a light-transmission bulb shell and a retainer rim, said heat sink having a light-emitting substrate bonded to a top side thereof, said light-emitting substrate carrying a plurality of light-emitting diodes, said radiation fin set comprising a plurality of radiation fins radially arranged around said heat sink at predetermined intervals, said insulative lamp bulb base being affixed to a bottom side of said radiation fin set, said retainer rim being set between said radiation fin set and said light-transmission bulb shell, wherein: said light-transmission bulb shell comprises a plurality of retaining lugs equiangularly spaced around a bottom open side thereof; said retainer rim is an annular frame comprising opposing front wall and back wall, a plurality of protruding strips equiangularly spaced around an inner perimeter of said front wall and respectively plugged into gaps between each two adjacent ones of said radiation fins of said radiation fin set, and a plurality of retaining notches equiangularly spaced around an outer perimeter of a back wall thereof and respectively forced into engagement with the respective retaining lugs of said light transmission bulb shell.