Short arc discharge lamp having anode with tungsten coating ther

Details Short arc discharge lamp having anode with tungsten coating ther Short arc discharge lamp having anode with tungsten coating ther

1997-02-24

1999-07-27

Patel, Vip

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313632, 313633, 313643, H01J 1704

Patent

active

059295651

ABSTRACT:
A discharge lamp of the short arc type including an arc tube and an anode and cathode within the arc tube positioned opposite one another. The present invention includes an anode arrangement in which the temperature increase of the anode in luminous operation is suppressed as much as possible, in which blackening of the inside wall of the arc tube as a result of premature vaporization of the anode material is suppressed, and in which the durability of the above described lamp is prolonged. Specifically, the outer surface of the anode includes sintered layers of fine-particle tungsten adjacent the tip of the anode. In this way, the effective surface area of the anode is increased, the heat radiation from the anode is accelerated, and the premature vaporization of the anode material is suppressed.

REFERENCES:
patent: 3248591 (1966-04-01), Arndt
patent: 3723783 (1973-03-01), Beese et al.
patent: 3911309 (1975-10-01), Kummel et al.
Patent Abstracts of Japan, vol. 014, No. 584, (E-1018), Dec. 27, 1990 & JP 02 256150 A (Ushio Inc.), Oct. 16, 1990, *Absract*.
Patent Abstracts of Japn, vol. 015, No. 090, (E-1040), Mar. 5, 1991 & JP 02 304857 A (Ushio Inc), Dec. 18, 1990, *Abstract*.

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