H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 61/10 (2006.01) A61L 2/10 (2006.01) C02F 1/32 (2006.01) H01J 61/04 (2006.01) H01J 61/36 (2006.01) H01J 61/72 (2006.01)
Patent
CA 2452489
A cathode shield for a gas discharge lamp having a predetermined size hole (32) proportional to the diameter of a cup (26) and the diameter of the glass envelope (14) of the gas discharge lamp (10). A conductive cup (26) is placed around an electrode or a filament (22). The cup (26) is covered with an insulator material (30) having a hole (32) therein. The diameter of the hole (32) in the cover has a proportional relationship to the diameter of the envelope (14) of the lamp (10) and the diameter of the cup (26). The ratio of the diameter of the envelope (14) and the hole (32) in the cover ranges between 3.5 and 4.5. The ratio of the diameter of the cup (36) and the hole (32) in the cover ranges between 2.0 and 3Ø It has been determined that these ratios improve current loads without changing discharge characteristics. Additionally, lower temperature operation and starting is facilitated with increased service life. The cathode shield is particularly applicable to germicidal lamps used in water treatment due to the cooler starting and operating temperatures required.
Light Sources Inc.
Osler Hoskin & Harcourt Llp
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