Fluorescent lamp including a multi-ringed bulb

Details Fluorescent lamp including a multi-ringed bulb Fluorescent lamp including a multi-ringed bulb

2003-11-21

2008-10-28

Guharay, Karabi (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C220S00210R

Reexamination Certificate

active

07443092

ABSTRACT:
There is provided a multi-ringed bulb including a plurality of ring bulbs in which a plurality of straight tube portions having an outside diameter of from 12 to 20 mm are connected to each other through bent portions on a same plane. Electrodes are provided hermetically at respective ends of outermost and innermost bulbs of the plurality of ring bulbs. A connection portion connects other adjacent ends of the outermost and innermost bulbs to each other so that the outermost and innermost bulbs communicate with each other, to form a single discharge path. A phosphor layer is formed on inner surfaces of at least the straight tube portions5aof the inner and outer bulbs. The multi-ringed structure bulb is filled with discharge medium. The above-mentioned structure permits to provide a fluorescent lamp and a lighting apparatus, which have a small strain in the inner and outer bulbs, a high strength and an excellent luminous efficiency.

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