Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1982-08-18
1985-02-12
Demeo, Palmer
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313634, 313638, H01J 6134, H01J 6118
Patent
active
044993960
ABSTRACT:
A metal halide arc discharge lamp having a gaseous fill within the outer envelope and means for suppressing convection currents within such fill; and methods of operating and constructing such lamps. A light-transmissive sleeve or enclosure surrounding the arc tube laterally and about at least one end thereof is so shaped and mounted with respect to the arc tube as to insure that the Rayleigh Number, a quantitative measure of convection flow, in the atmosphere laterally surrounding the arc tube will be less than 5.times.10.sup.4 during operation of the lamp whereby excessive convective heat loss in such lamp will be effectively suppressed.
REFERENCES:
patent: 2177755 (1939-10-01), Uyterhoeven
patent: 2270276 (1942-01-01), Doering
patent: 3250934 (1966-05-01), Peterson
patent: 3379916 (1968-04-01), Delrieu et al.
patent: 4199701 (1980-04-01), Bhattacharya
patent: 4281274 (1981-06-01), Bechard et al.
patent: 4302699 (1981-11-01), Keeffe et al.
patent: 4338540 (1982-07-01), Sovilla
patent: 4401913 (1983-08-01), Koza et al.
Fohl Timothy
Keeffe William M.
Rothwell Harold L.
Demeo Palmer
GTE Products Corporation
Romanow Joseph S.
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