Patent ID: 6967444
Filing Date: 2005-11-22
Classification: H01J

Abstract:
1. A miniature HID lamp comprising: a light transmissive inner envelope having a wall defining an axially extended enclosed volume, a first seal and a second seal; the enclosed volume having a volume of less than 22 cubic millimeters; a first electrode assembly having an exterior end and a first electrode tip, the first electrode assembly being sealed in the first seal and extending between the exterior and the enclosed volume; a second electrode assembly having an exterior end and a second electrode tip, the second electrode assembly being sealed in the second seal and extending between the exterior and the enclosed volume, with the first tip nominally offset from the second tip by a predefined gap distance; a lamp fill enclosed in the defined volume including mercury at a concentration of less than 0.02 milligrams per cubic millimeter, metal halide salts at a concentration of less than 0.02 milligrams per cubic millimeter and xenon at a cold pressure of from 4×10 5 to 16×10 5 Pascals; the fill being excitable to light emission on the application of sufficient electric power between the first electrode and second electrode; and a light transmissive jacket surrounding the inner envelope and sealed to the inner envelope along the first seal and the second seal, the jacket being formed from a material with a light absorbing component to thereby be heated by a portion of light emission from fill material, and sufficiently thermally conductive to conduct a portion of such heat to the envelope seals; wherein the lamp fill includes from 0.20 milligrams to 0.40 milligrams of mercury.