End base construction for a discharge lamp

Details End base construction for a discharge lamp End base construction for a discharge lamp

1989-07-06

1991-06-18

Wieder, Kenneth

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313624, 313318, H01J 6136

Patent

active

050251929

ABSTRACT:
Disclosed herein is a discharge lamp comprising a light-emitting tubing equipped with an envelope having side tube portions of a graded seal structure; and cylindrical bases fitted on the side tube portions to cover the outer end portions of the side tube portions and fixed with a cement on the side tube portions so as to define radiating spaces. In this discharge lamp, cement-controlling members for avoiding the outflow of the cement filled in a gap between the outer peripheral surface of each side tube portion and the base into the radiating space are respectively provided in the bases. The cement-controlling member is composed of a first ring portion which stops up the gap, a second ring portion held in contact with the inner bottom surface of the base and a connecting portion. The outflow of the cement into the radiating space is prevented so that the base can be fixed strongly on the side tube portion.

REFERENCES:
patent: 4038578 (1977-07-01), Mathijssen

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