H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/48
H05B 41/14 (2006.01) H01J 61/54 (2006.01) H01J 61/56 (2006.01)
Patent
CA 1089001
ABSTRACT A metal vapour discharge lamp having a discharge tube provided with two internal main electrodes and an external starting-auxiliary electrode which is situated opposite an inter- nal portion of the discharge tube disposed between the main electrodes. The dimension of the auxiliary electrode measured in a direction parallel to the longitudinal axis of the discharge tube is not more than 10% of the spacing of the main electrodes. The auxiliary electrodes is connected to a tapping point of a voltage divider containing a temperature-dependent resistor and this voltage divider shunts the discharge path between the main electrodes. The voltage division in the operating condition of the lamp has such a value that the difference in potential between the auxiliary electrode and the internal portion of the discharge tube is not more than 20% of the arc voltage of the lamp.
269544
Broerse Pieter H.
Van Vliet Johannes A. J. M.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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