Electric lamp and discharge devices – With gas or vapor – Having electrode lead-in or electrode support sealed to...
Patent
1989-03-15
1990-11-20
DeMeo, Palmer C.
Electric lamp and discharge devices
With gas or vapor
Having electrode lead-in or electrode support sealed to...
313625, 313634, 445 22, 445 26, H01J 926, H01J 6136, H01J 6130
Patent
active
049721194
ABSTRACT:
A ceramic envelope device for an HID lamp, wherein a translucent ceramic arc tube is closed at opposite end sections thereof by respective end caps which support respective discharge electrodes on their inner surfaces. At least one of the opposite end sections of the arc tube is sealed with a sealing layer, and each of the sealed end section of the tube includes a first axial portion having a first inside diameter, and a second axial portion having a second inside diameter smaller than the first inside diameter and disposed axially inwardly of the first axial portion. The first and second axial portions define an annular shoulder surface radially inwardly extending between the first and second inside diameters. The first axial portion preferably has a cylindrical wall thickness of 1.0-1.5 mm, and the annular shoulder surface preferably has a radial width of 0.2-0.8 mm. The sealing layer is interposed between the first axial portion of the arc tube and the corresponding end cap. The inner surface of the corresponding end cap includes a peripheral portion held in abutting contact with the annular shoulder surface. The first and second inside diameters are preferably formed by a stepped-diameter drill.
REFERENCES:
patent: 4155757 (1979-05-01), Hing
patent: 4155758 (1979-05-01), Evans et al.
patent: 4665344 (1987-05-01), Kajihara et al.
patent: 4687969 (1987-08-01), Kajihara et al.
patent: 4694219 (1987-09-01), Hing
patent: 4808881 (1989-02-01), Kariya et al.
Izumiya Hirotsugu
Kariya Mikio
DeMeo Palmer C.
NGK Insulators Ltd.
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