Fluorescent lamp unit and lighting apparatus having the fluoresc

Details Fluorescent lamp unit and lighting apparatus having the fluoresc Fluorescent lamp unit and lighting apparatus having the fluoresc

1996-09-20

1998-10-27

Patel, Ashok

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313493, 313317, 362362, H01J 6132

Patent

active

058281703

ABSTRACT:
A fluorescent lamp unit includes a fluorescent lamp having a bulb constituting one discharge path, said bulb including three U-shaped tube portions, a lighting circuit operatively connected to the fluorescent lamp for lighting the fluorescent lamp, and a cover part having a cap at one end thereof and having a globe at other end thereof for containing the lighting circuit and the fluorescent lamp. Each of the three U-shaped tube portions has a pair of straight tube portions provided straight in a direction along to a basic center axis of the fluorescent lamp unit and has a bent portion being bent so as to be convexly curved toward the globe side opposite to the cap side thereby to form substantially U-shape and linking the glove side ends of the pair of straight tube portions. The straight tube portions are arranged equidistantly on a circumference of a certain radius from the basic center axis. The three U-shaped tube portions are formed so that minimum gaps c1, c2a, and c2b between the inner surface of the globe and each of the outer surfaces of the globe side ends of the three U-shaped tubes have substantially a same length.

REFERENCES:
patent: 4871944 (1989-10-01), Skwirut et al.
patent: 5243256 (1993-09-01), Holzer
patent: 5610476 (1997-03-01), Oga et al.

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