Metal halide arc lamp having pinch seal with elongated space

Details Metal halide arc lamp having pinch seal with elongated space Metal halide arc lamp having pinch seal with elongated space

1986-06-02

1988-01-26

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

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

313573, 313634, H01J 6130, H01J 6136

Patent

active

047218878

ABSTRACT:
A metal halide arc lamp includes a quartz arc tube having a pair of electrode shaft therein. The quartz arc tube which encloses a fill including mercury and metal halide materials is composed of a hollow illuminating portion and a pair of squeezed portions which have an individual elongated space, extending along the electrode shaft, the minimum value of the width, in the direction perpendicular to the electrode shaft, of which is controlled within specific values in connection with a diameter of the electrode shaft to reduce a probability of crack occurrence in the squeezed portion by a pressure produced when the fill is vapored rapidly in the elongated space of the squeezed portion.

REFERENCES:
patent: 4171500 (1979-10-01), Van Lieshout
patent: 4282395 (1981-08-01), Hagemann

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