H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 61/073 (2006.01)
Patent
CA 2076629
A low-wattage metal-halide discharge lamp (10) has a quartz tube (12) of the double ended type hat forms a bulb (14) or envelope, a pair of electrodes, e.g., an anode (30) and a cathode (32), which penetrate in- to an arc chamber (16) inside the envelope(14), and a suitable amount of mercury (98) pies one or more metal halide salts. The electrodes (30, 32) are each formed of a refractory metal, i.e., tungsten wire, extending through the respective necks (22, 24) info the arc chamber (16). The elec- trodes (30, 32) are of a composite design i.e., in the form of a club, with a lead-in wire (34;44) of mall diameter supported in the quartz (12) in the associated neck (22; 24), and a post member (36; 46) of greater di- ameter supported on the lead-in wire (34, 40). The post members (36; 46) are supported out of contact with the quartz of the necks (22, 24) and also out of contact with the bulb wall. The larger size of the post member (36, 46) allows heat at the tip (38, 48) to diffuse back into the post member (36, 46) so that the metal tip (38, 48) will not evaporate. The narrow lead-in wire (34, 44) keeps most of the heat in the bulb (14) so that flow of heat out of the neck portions (22, 24) is limited. Lamps of this design achieve high efficacy at relative low power (below 40 watts).
Graham Timothy W.
Scoins John
Borden Ladner Gervais Llp
Welch Allyn Inc.
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