Arc tube and low-pressure mercury lamp

Details Arc tube and low-pressure mercury lamp Arc tube and low-pressure mercury lamp

2007-11-20

2007-11-20

Roy, Sikha (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S637000, C313S639000, C313S573000, C315S291000, C315S056000, C315S063000

Reexamination Certificate

active

10508786

ABSTRACT:
This invention aims at providing a low-pressure mercury lamp having an improved luminous efficiency while maintaining the compactness and long life of the arc tube. This lamp comprises an arc tube formed by bending a glass tube. This arc tube is formed into a double-spiral structure comprising: a turning part located in substantially the midsection from both ends of the glass tube; a first spiral part starting from one of the ends and spiraling around the pivotal axis to reach the turning part; and a second spiral part starting from the turning part and spiraling around the pivotal axis to the other end. The glass tube has a circular shape in cross section with 7.4 mm inner diameter. This low-pressure mercury lamp is a 12 W lamp alternative to a 60 W incandescent lamp, and the bulb wall loading under steady state illumination is set at 0.103 W/cm2.

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