Metal halide lamp with pleated luminous tube envelope

Details Metal halide lamp with pleated luminous tube envelope Metal halide lamp with pleated luminous tube envelope

1994-04-13

1996-06-18

Pascal, Robert

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

313634, 220 21R, 315 50, H01J 6133

Patent

active

055281044

ABSTRACT:
A metal halide lamp includes a luminous tube which is sealed and filled with predetermined rare gases and metal halide, a pair of electrodes provided in the inner portion near both ends of the luminous tube, an outer tube which encloses the luminous tube, and a pair of socket connectors electrically connected with the electrodes, wherein the luminous tube cross-section forms an uneven pattern and is pleated along outer and inner surfaces of the luminous tube. The atmospheric pressure in the luminous tube is stabilized to prevent the bending of the arc. Accordingly, the lifetime of the luminous tube is prolonged and high vapor density is obtained, thereby improving luminous efficiency and color rendering by far.

REFERENCES:
patent: 3885181 (1975-05-01), Nelson et al.
patent: 4260931 (1981-04-01), Wesselink et al.
patent: 4438373 (1984-03-01), Watanabe et al.
patent: 5055740 (1991-10-01), Sules
patent: 5252886 (1993-10-01), Renardus et al.

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