High pressure discharge lamp

H - Electricity – 01 – J

Patent

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Details

H01J 61/073 (2006.01) H01J 61/20 (2006.01) H01J 61/86 (2006.01) H01J 61/88 (2006.01)

Patent

CA 2496560

A high pressure discharge lamp according-to the present invention is a high pressure discharge lamp in which the top ends of a pair of electrodes opposed in a discharge vessel 2 of an arc tube 1 are formed each into a substantially semispherical shape and a protrusion 10 to form an arc spot is formed at each top end, wherein all of the relation: 0.3 L/I 1.0 for an inter-electrode distance L(mm) between the electrodes and a lamp current I(A) during stable lighting, the relation: 1.2 x 10-7 X/Y 1.1 x 10-5 for a molar amount X(mol) of bromine in the bromide sealed in the discharge vessel 2 and an inner volume Y(ml) of the discharge vessel 2, and the relation: 9. W3/2/I 65, for a weight W(mg) of tungsten at the top end of each electrode 3 formed into a substantially semispherical shape are satisfied, and the lighting frequency of a rectangular wave during stable lighting is 45 Hz or higher.

L'invention concerne une lampe à décharge haute pression comprenant des électrodes (3, 3) opposées l'une par rapport à l'autre dans une enveloppe de décharge (2) d'un tube d'arc (1) et présentant normalement des extrémités semi-sphériques sur chacune desquelles une protubérance (10) sert d'arc à points, de manière que le phénomène de saut d'arc soit évité. Le rapport entre la distance L (mm) entre les électrodes (3, 3) et le courant de lampe I (A) pendant le fonctionnement de la lampe stable 0,3 </= L/I </= 1,0, le rapport entre le mole X (mol) du brome d'un bromure dans l'enveloppe de décharge (2) est hermétique et le volume interne Y (ml) de l'enveloppe de décharge (2) 1,2 x 10<-7> < X/Y < 1,1 X 10<-5>, et le rapport entre le poids W (mg) du tungstène à l'extrémité normalement sphérique de l'électrode (3) et le courant de lampe I (A) 9 </= W<3/2>/I </= 65 sont des conditions remplies, et la fréquence opérationnelle d'onde rectangulaire pendant un fonctionnement stable est supérieure à 45 Hz.

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