H - Electricity – 01 – J
Patent
H - Electricity
01
J
316/19, 315/48
H01J 61/10 (2006.01) C03B 23/06 (2006.01) C03B 23/09 (2006.01) H01J 9/24 (2006.01) H01J 61/30 (2006.01) H01J 61/32 (2006.01)
Patent
CA 1319393
ABSTRACT A compact low-pressure mercury vapour discharge lamp com- prises two or more straight tubes (2,3) which are inter- connected by means of couplings (4), to form a discharge chamber between two electrodes (15). The electrodes are located in the outermost ends (7,8) of the discharge chamber of the lamp, these ends being connected in a gas- tight manner to a lamp base (9) incorporating the requi- site contact pins (11,12) and conductors (16). Located downstream of the electrodes (15) in the direction of the discharge current are tube constrictions (13,14) which define around the electrodes (15) the spaces in which released ions from the electrode emission material are held concentrated, so as to fall back onto the elec- trode surface upon a change in current phase. The method for manufacturing the lamp commences with a straight glass tube which is coated internally with luminescent powder. The tube is then heated around annular areas adjacent the tube ends. The constrictions (13,14) are formed in the tube wall as the tube rotates, where- after the lamp is manufactured in a manner known per se.
509699
Bjorkman Ake
Fetherstonhaugh & Co.
Lumalampan Aktiebolag
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