Patent ID: 7800909

Claim:
A lamp base having a heat sink for connecting to a bulb having two electrodes, the lamp base comprising: a heat sink having a heat-dissipating base, the heat-dissipating base being formed with a trough for accommodating the bulb therein and a first opening at a center portion of the heat-dissipating base and a second opening at a peripheral portion of the heat-dissipating base; a first electrically conductive piece fixed in the trough and electrically connected to an electrode of the bulb; a thread-shaped second electrically conductive piece fixed in the trough and electrically connected to the other thread-shaped electrode of the bulb, the thread-shaped second electrically conductive piece being electrically insulated from the first electrically conductive piece and placed between an inner thread on an inner wall of the trough and the thread-shaped electrode of the bulb; and a plurality of leads electrically connected to the first electrically conductive piece through the first opening and the second electrically conductive piece through the second opening respectively, wherein the inner wall of the trough is formed with the inner thread for threadedly connecting to the bulb and the second electrically conductive piece is fixed to the inner wall with a shape corresponding to that of the inner thread.