Method of manufacturing lamp and quartz bulb
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United States of America Patent
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Jan 1, 2013
Grant Date -
Dec 8, 2011
app pub date -
Dec 3, 2008
filing date -
Dec 3, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
It is intended to enable accurate positioning of an electrode top end such that the arc length is constant and prevent leakage from sealing portions due to bending or twisting of a molybdenum foil upon sealing an electrode mount by heating the sealing portion. For attaining the object described above, a quartz bulb in which extension tubes each having an inner diameter larger than the inner diameter of the opening of a body tube is welded the openings of both ends of a body tube formed with light emitting portion and a sealing portion thereby forming to a positioning step is used, and electrode mounts each formed with a positioning engagement portion at a position spaced apart by a predetermined length from the electrode top end are inserted to engage the positioning engagement portion of the electrode mounts to the positioning step and, in this state, the sealing portions are sealed.
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