Patent ID: 7249876
Filing Date: 2007-07-31
Classification: H01J

Abstract:
1. An improved lamp holder for a high intensity discharge (HID) lamp, comprising: a base having a recess, a circular ring received in a center of the recess and receiving an end of a lamp tube, three insertion slots arranged on a periphery of the recess, and an insertion hole located at the periphery of the recess for receiving a sleeve; and a metallic positioning member comprising a vibration-damping clamping ring having three extension feet extending outwards and downwards from a bottom rim of the clamping ring, the extension feet being mounted to the corresponding insertion slots of the base whereby the positioning member is coupled with the base; wherein the clamping ring of the positioning member has a plurality of protrusions protruding inwards from a top rim of the clamping ring whereby after the lamp tube goes through the clamping ring, the protrusions clip the lamp tube and form a buffer holder between the lamp tube and the clamping ring, thereby preventing the lamp tube from directly colliding with the clamping ring due to vibration.