Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1988-09-20
1990-06-19
Yusko, Donald J.
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313491, 313573, 313574, 313610, 313634, H01J 6302
Patent
active
049356640
ABSTRACT:
A low pressure mercury vapor discharge lamp having a double-tube type discharge vessel consisting of a closed outer glass bulb and an inner glass tube coaxially disposed within the outer bulb. An electrode is disposed in the inner glass tube, while a ring-shaped electrode structure is disposed in the outer envelope outside the inner glass tube. The electrode structure completely surrounds the inner glass tube and includes a pair of lead-in wires and a pair of semicircular electrode sections. Preferably, an inert gas having a pressure within the range of from about 4.0 to 6.0 torr and a quantity of mercury are contained within the lamp. The lamp of the present invention provides a fully diffused discharge without requiring an expensive transistor switching circuit or a permanent magnet to rotate the discharge about the inner tube.
REFERENCES:
patent: 2473642 (1949-06-01), Found et al.
patent: 3551736 (1970-12-01), Doehner
patent: 3609436 (1971-09-01), Campbell
patent: 4177401 (1979-12-01), Yamane et al.
patent: 4438373 (1984-03-01), Watanabe et al.
patent: 4461981 (1984-07-01), Saikatsu et al.
patent: 4582523 (1986-04-01), Marcucci et al.
Maya Jakob
Thibault Paul A.
Whitney Fred
Bessone Carlo S.
GTE Products Corporation
Horabik Michael
Yusko Donald J.
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