Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1987-12-02
1988-11-08
DeMeo, Palmer C.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313628, 313631, H01J 61073, H01J 6130
Patent
active
047836113
ABSTRACT:
The high-pressure gas discharge lamp according to the invention has at least one electrode comprising an electrode rod and a helical winding near its tip projecting into the lamp vessel, both mainly of tungsten. The winding has a first layer of turns directly around the rod with locally a turn of high pitch P. The winding has around the first layer another layer of turns which is wound in opposite direction and has a turn of high pitch gripping around the turn of high pitch of the first layer forming therewith contact areas located diametrically opposite to each other. Between the contact areas high pitched turn of the outer layer engages the rod with a clamping fit. An additional turn of the second layer wound in the same direction as the first layer is disposed over the high pitched turns of the second layer in the region where the high pitched turn of the second layer engages the electrode rod. The winding has the same diameter over its entire length and is fixed firmly to the electrode rod.
REFERENCES:
patent: 3170081 (1965-02-01), Rokosz
Marks Peter L. F. J.
Vogels Anthonius B. P.
DeMeo Palmer C.
U.S. Philips Corp.
Wieghaus Brian J.
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