Metal halide lamp of the short arc type

Details Metal halide lamp of the short arc type Metal halide lamp of the short arc type

1995-11-27

1998-03-03

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

313621, 313631, H01J 1704

Patent

active

057239444

ABSTRACT:
To minimize "color hue" and "flickering" on an irradiated surface such as a screen or the like, is achieved by the fact that, in a metal halide lamp of the short arc type which has a cathode and an anode in which at least rare earth halides and mercury are encapsulated and which is operated with an essentially horizontal discharge direction using direct current power, the cathode has a tungsten electrode shaft about which a tungsten coil is wound, and the relationship 0.029<S/I<0.076 is satisfied where S is the cross section of the electrode shaft (mm.sup.2) and I the current in steady-state luminous operation (A). In accordance with another aspect of the invention, the lamp is operable with a current I (amperes) in steady-state luminous operation in a range from 1.6<I<5.0 and the anode has a tip formed of a roughly cylindrical rod with a bevelled edge between a blunt end of the rod and a peripheral surface of the rod, and with the relationship of the current I and the area S of the blunt end (mm.sup.2) 0.045<S/I<0.08 being satisfied.

REFERENCES:
patent: 4906895 (1990-03-01), Pabst et al.
patent: 4937496 (1990-06-01), Neiger et al.

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