Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Electric switch inside evacuated or gas filled envelope
Patent
1979-03-21
1980-05-27
Smith, Alfred E.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Electric switch inside evacuated or gas filled envelope
315 75, H01J 744
Patent
active
042052580
ABSTRACT:
A high-intensity discharge lamp having an arc tube which is enclosed by and supported within a light-transmitting outer envelope which is spaced from the arc tube. The outer envelope enclosing a hard vacuum. Electrical lead-in means are sealed through the arc tube connected to the electrodes. Electrical adapter means are affixed to the outer surface of the protective envelope to facilitate electrical connection for the lamp to a source of electrical power. A pair of electrical conductors electrically connect the electrical adapter means to the electrical lead-in means. Fuse means is provided. The fuse means has a fusible element extending from one of the electrical conductors and separated from and encircling an insulating sleeve means carried about the other of the electrical conductors, so that the spacing therebetween constitutes the shortest gap within the envelope between opposite current-carrying components. The hard vacuum enclosed by the outer envelope is obtained by flashing barium getter means.
Improved insulating sleeve means is provided having an outer hollow elongated sleeve member having insulating spacing means integral therewith and projecting inwardly from the inner surface thereof and positioned a predetermined distance inwardly from the ends of the sleeve member. The insulating spacing means is provided with a bore to receive and encircle the other electrical conductor in electrically insulative relationship to prevent the outer elongated sleeve member from contacting the other electrical conductor, whereby barium flashed during gettering that may be adhered to the surface of the outer hollow sleeve member is prevented from causing an electrical short of the arc tube.
REFERENCES:
patent: 2950417 (1960-08-01), Breeding et al.
patent: 3767965 (1973-10-01), Collins et al.
patent: 3849691 (1974-11-01), Collins
Lombard R. S.
Roberts Charles F.
Smith Alfred E.
Westinghouse Electric Corp.
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