Discharge lamp for an automotive vehicle

Details Discharge lamp for an automotive vehicle Discharge lamp for an automotive vehicle

1998-01-16

2000-07-25

Patel, Ashok

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313 25, 313573, H01J 6135

Patent

active

060940085

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.

REFERENCES:
patent: 3867661 (1975-02-01), Waltz et al.
patent: 4594529 (1986-06-01), De Vrijer
patent: 5646471 (1997-07-01), Scholler et al.
patent: 5736811 (1998-04-01), Westmeyer et al.

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