Electric lamp and discharge devices – With temperature modifier – For electrode within an envelope
Patent
1975-04-07
1976-07-20
Rolinec, R. V.
Electric lamp and discharge devices
With temperature modifier
For electrode within an envelope
313 40, 313 42, 313 46, 313146, 313152, H01J 6152
Patent
active
039708837
ABSTRACT:
The heat-transfer capability of a movable-electrode gas-filled arc lamp is optimized. In the preferred embodiment, the movable electrode is the anode which is mounted at the base of the lamp coaxialy with and spaced apart from the cathode. Low-voltage starting of the lamp is provided by solenoid means for moving the anode briefly into contact with the cathode and then withdrawing the anode from contact with the cathode so that a difference of electrical potential develops between the cathode and the anode, which is sufficient to ionize the gas in the gap formed therebetween. The arc thereby generated in the gap follows the withdrawing anode to its fully spaced-apart position with respect to the cathode. A heat sink member is disposed within the gas-filled envelope at the base of the lamp, and a metal collar is affixed to and surrounds the movable anode. The collar provides thermally conductive contact with the heat sink member when the anode is in its fully spaced-apart position with respect to the cathode. The thermal impedance through the collar to the heat sink member is less than the thermal impedance through any other path from the anode.
REFERENCES:
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patent: 3529209 (1970-09-01), Lienhard et al.
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patent: 3626230 (1971-12-01), Stewart
patent: 3644769 (1972-02-01), Kennedy
patent: 3876908 (1975-04-01), Chan
Cole Stanley Z.
Herbert Leon F.
Hostetter Darwin R.
Morrissey John J.
Rolinec R. V.
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