Fluorescent lamp having double-bore inner capillary tube

Details Fluorescent lamp having double-bore inner capillary tube Fluorescent lamp having double-bore inner capillary tube

1991-05-13

1992-07-28

Yusko, Donald J.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313488, 313493, 313573, 313609, 313610, 313634, 313635, 313642, H01J 6142, H01J 6134, H01J 6135

Patent

active

051343363

ABSTRACT:
A miniature, low-wattage fluorescent lamp includes a double-bore inner capillary tube having a pair of ends and a convoluted shape. The inner capillary tube is comprised of a vitreous material (e.g., quartz) which is capable of transmitting ultraviolet radiation. A pair of electrodes (e.g., mercury pool) is located at one end of the inner capillary tube and disposed within respective bores. An ionizable medium is enclosed within the inner capillary tube and includes an inert starting gas and a quantity of mercury. When energized, the ionizable medium generates an arc discharge between the electrodes consisting of ultraviolet radiation. A phosphor coating responsive to the ultraviolet radiation is disposed on an outer surface of the inner capillary tube and remote from the arc discharge. An outer jacket of vitreous material surrounds the inner capillary tube and contains an inert gas at a predetermined pressure.

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