Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent
1990-02-23
1992-09-01
Yusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
Envelope with particular structure
313620, 313623, H01J 1716
Patent
active
051442019
ABSTRACT:
A metal halide arc discharge lamp is disclosed having a power input rating of not more than 35 watts. The lamp includes an envelope of light transmissive material, such as fused quartz, including a bulb portion, a pair of transitional neck portions extending from the bulb portion, and a pair of stem portions extending from the transitional neck portions respectively. The bulb portion of the envelope defines an arc chamber therein and has an external surface area of such value as to produce a wall loading not exceeding 35 watts/cm.sup.2. The arc chamber contains a fill of mercury, inert gas and metal halide. The mercury and the metal halide are adapted to substantially vaporize during operation of the lamp. A pair of electrodes extend into the arc chamber from the pair of neck portions respectively. Each electrode has an electrode tip spaced apart from one another by a distance A within the arc chamber. The neck portions of the envelope each have a wall surrounding a segment of one of the electrodes. The walls of the neck portions each have a stretched section with a minimum wall thickness not exceeding about 1.5 mm. A pair of inlead assemblies are electrically coupled to the pair of electrodes respectively. The inlead assemblies pass from the electrodes through a hermetically sealed section in the stem portions of the envelope to the exterior of the lamp.
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Briggs Daniel C.
Graham Timothy W.
Horabik Michael
Welch Allyn Inc.
Yusko Donald J.
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