Discharge lamp for an automotive vehicle
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 25, 2000
Grant Date -
N/A
app pub date -
Jan 16, 1998
filing date -
Jun 6, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A discharge lamp for an automotive vehicle including a discharge bulb and an outer cover tube for covering the discharge bulb. The discharge bulb is composed of a discharge chamber portion, a pair of seal portions for sealing both ends of the discharge chamber portion, and a pair of discharge electrodes held in respective ones of the seal portions. At the end of each seal portion adjacent to the discharge chamber portion, a taper portion is provided, which is narrowest near the discharge chamber portion, and which defines an angle with respect to a tube axis of the discharge bulb of 45 degrees or less. A curvature of a tube wall of the discharge chamber portion, is substantially constant. A ratio of the minimum thickness to the maximum thickness of the tube wall measured within that angle is between 1 and 0.8. The discharge bulb and the outer cover tube are in contact, with the portion of said discharge chamber portion having the maximum outer diameter being in contact with the outer cover tube.
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