Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1993-09-24
1996-07-02
O'Shea, Sandra L.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313324, 313313, 313571, 313634, 313642, H01J 1728
Patent
active
055325432
ABSTRACT:
An electric discharge lamp has a discharge vessel including pair of opposing planar seals each having a pair of major faces and a pair of minor, side faces. A containment shield surrounds the discharge vessel and includes a glass sleeve and a helically coiled wire secured on the glass sleeve. The glass sleeve is pinched to bevelled ends of the minor, side faces of the seals only and substantially does not engage the major faces of the seal. The wire is fixed around the sleeve in an electrically floating manner, e.g. by clamping fit. With the sleeve secured to the discharge vessel, MH quality photometrics are obtained with a tubular body arc tube without an end coat. The construction of the lamp is simple and effective to protect the outer bulb from being damaged by an explosion of the discharge vessel, and to prevent sodium from disappearing from the discharge vessel as a result of photoemission.
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Electric discharge lamps, Dr. John Waymouth, 1988.
Venture lighting Co, Cleveland, OH, 1991, pp. 16-17.
Canale Joseph E.
Kowal Albert E.
Pragt Henrikus J. H.
van der Leeuw Bart
O'Shea Sandra L.
Patel Ashok
Philips Electronics North America Corporation
Wieghaus Brian J.
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