Metal vapor discharge lamp having configured envelope for...

Details Metal vapor discharge lamp having configured envelope for... Metal vapor discharge lamp having configured envelope for...

2006-07-18

2006-07-18

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S631000, C313S639000, C313S573000

Reexamination Certificate

active

07078860

ABSTRACT:
A metal vapor discharge lamp, comprises: a translucent ceramic envelope, the envelope comprising a center bulb for defining a discharge space and side tubes, the center bulb and the side tubes being integrally molded; a pair of current suppliers extending through hollows of the side tubes respectively, each of the current suppliers comprising an electrode and a lead-in wire, a first end of the electrode being disposed in the discharge space, a second end of the electrode being connected with the lead-in wire; a sealant for hermetically sealing open ends of the side tubes; and a light-emitting metal contained in the discharge space. An inner wall and an external wall of a seamless boundary portion between the center bulb and each of the side tubes have the smallest curvature radius of Rimm and Romm, respectively. The center bulb has an inner diameter of D mm. The lamp has an electric power of P watts. The radius Ri, radius Ro, diameter D and electric power P satisfy,in-line-formulae description="In-line Formulae" end="lead"?−0.00076P+0.304≦Ri/D≦−0.00076P+0.490,   Formula (1)in-line-formulae description="In-line Formulae" end="tail"?where P≦350 watts; andin-line-formulae description="In-line Formulae" end="lead"?1.28Ro≦Ri≦1.39Ro.   Formula (2)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6707252 (2004-03-01), Kakisaka et al.
patent: 6747411 (2004-06-01), Miyazawa
patent: 2004/0263080 (2004-12-01), Brates et al.
patent: 2000-100386 (2000-04-01), None
patent: 2000-340171 (2000-12-01), None
patent: 2002-164019 (2002-06-01), None

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