Single-sealed metal vapor electric discharge lamp

Details Single-sealed metal vapor electric discharge lamp Single-sealed metal vapor electric discharge lamp

1990-09-18

1992-08-11

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Having electrode heated by space discharge current

313631, 313632, H01J 6106

Patent

active

051382296

ABSTRACT:
A single-sealed metal-vapor discharge lamp forms a press sealed portion on one end to seal in a discharge space starting noble gas, light emission metal, and mercury. The discharge lamp has a pair of electrodes with bent portions whose tip ends are bent opposite to each other in the discharge space; a pair of inner metallic foil conductors, to each one end of which the proximal ends of the electrodes are joined; and an arc tube enclosing a pair of internal lead wires, each one end of which is joined to the other end of the inner metallic foil conductors. The electrodes which are arranged approximately parallel in the arc tube. A bend angle .theta. of the bent portions arc is 60.degree..ltoreq..theta..ltoreq.120.degree., and the curvature radius R of the periphery of the bent portions is approximately R.gtoreq.1.2d (where, d is wire diameter of the electrode rod).

REFERENCES:
patent: 4766348 (1988-08-01), English et al.
patent: 4782266 (1988-11-01), Heider et al.
patent: 4864191 (1989-09-01), van de Weijer et al.
patent: 4973880 (1990-11-01), Honda et al.
patent: 4988917 (1991-01-01), Cox

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