Electric lamp and discharge devices – With temperature modifier – Electric heater
Patent
1976-12-27
1978-03-21
Demeo, Palmer C.
Electric lamp and discharge devices
With temperature modifier
Electric heater
313111, 313113, 313220, 313227, H01J 6135, H01J 6122, H01J 6152, H01J 6140
Patent
active
040805450
ABSTRACT:
Various sodium vapor lamp configurations are disclosed. In one, a sodium vapor discharge tube contains an excess of sodium which is condensed in predetermined locations, as for example dimples. To prevent condensation in the aperture through which light emission is desired, the discharge tube is heated at the aperture by ohmic heating of a conductive film such as tin oxide or by fine wires. In a second configuration, the discharge tube is coated on the inside with metallic sodium, the coating being internally reflective and defining an aperture, such as a slit, through which light output is directed. The aperture area is coated with a conductive coating such as tin oxide to provide ohmic heating of the aperture area so that metallic sodium condenses on the tube in areas other than the aperture. Thus, an excess of sodium is provided to control the lamp vapor pressure and also to form a light reflective coating to direct emission through the aperture.
REFERENCES:
patent: 3221198 (1965-11-01), Van der Wal et al.
patent: 3283202 (1966-11-01), Pennington
patent: 3646378 (1972-02-01), Goossens
patent: 3779640 (1973-12-01), Kidd
patent: 3995182 (1976-11-01), Balder et al.
DeMeo Palmer C.
Xerox Corporation
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