High-pressure gas discharge lamp having electrodes with coil lay

Details High-pressure gas discharge lamp having electrodes with coil lay High-pressure gas discharge lamp having electrodes with coil lay

1986-07-11

1991-03-19

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Having electrode heated by space discharge current

313631, 313344, 313575, 445 46, 445 51, H01J 6106

Patent

active

050013971

ABSTRACT:
The high-pressure gas discharge lamp according to the invention has electrodes which comprise an electrode rod 24 and a helical winding 26 near its tip 25 projecting into the lamp vessel, both of mainly tungsten. The winding 26 has a first layer of turns 27 helically wound around the rod 24 and locally having a turn of high pitch 29. The winding 26 has around the first layer 27 an outer layer of turns 28, at least two of the outer layer turns interlock with the turn of the high pitch 29 of the first layer 27 at contact areas 30. The turns engage with clamping fit the rod 24 diametrically opposite thereto. As a result, the winding 26 is fixed on the rod 24. If the first layer 27 is integral with the outer layer 28, the winding 26 can be sufficiently fixed with one turn of outer layer 28 interlocking with the high pitched turn 29.

REFERENCES:
patent: 2687489 (1954-08-01), Anderson, Jr. et al.
patent: 3132409 (1964-05-01), Freeman
patent: 3170031 (1965-02-01), Rokosz
patent: 3510190 (1970-05-01), Taxil
patent: 4044276 (1977-08-01), Keeffe et al.
patent: 4150317 (1979-04-01), Laska et al.
patent: 4559473 (1985-12-01), McVey

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