Gaseous discharge device

Details Gaseous discharge device Gaseous discharge device

1985-09-12

1987-09-08

Dixon, Harold

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Discharge device load

315 61, 315335, 315337, 372 81, 372 86, H01J 744

Patent

active

046926640

ABSTRACT:
In order to facilitate the initiation of plasma discharge inside a gaseous discharge tube, some form of pre-ionizing the gas is required. This invention describes a technique whereby a small but intense discharge region is created near the cathode of a d.c. discharge in order to generate the necessary electrons to initiate the formation of the main electrical discharge. It makes use of the high negative voltage that is applied on the discharge cathode with respect to the discharge anode. A third auxiliary pin electrode near the cathode is introduced into the discharge tube. It is connected on the outside to the anode through a resistor of a suitable value. In the presence of a high voltage across the main electrodes, corona discharge occurs near the auxiliary electrode. This leads to the formation of a small region of intense discharge between it and the cathode. The electron generated in this small discharge region would drift towards the anode under the high electric field between the main electrodes. The whole discharge volume would therefore be filled with energetic electrons and hence leads to the easy initiation of the main plasma discharge.

REFERENCES:
patent: 2351254 (1944-06-01), Elmendorf
patent: 2508114 (1950-05-01), Jenne
patent: 2544513 (1951-03-01), Stutsman
patent: 3775641 (1973-11-01), Goldberg
patent: 3792372 (1974-02-01), Mark
patent: 4064416 (1977-12-01), Krense et al.

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