Electric lamp and discharge devices – With temperature modifier – Hollow electrode or lead
Patent
1991-03-07
1992-10-27
DeMeo, Palmer C.
Electric lamp and discharge devices
With temperature modifier
Hollow electrode or lead
313 36, 313 35, 313478, 358217, 358237, H01J 6152, H04N 574
Patent
active
051592304
ABSTRACT:
A target assembly for a projection cathode ray tube is provided wherein the target member is cooled by convective fluid heat transfer occurring within and around a partially hollow support shaft screw. The target member is a solid block of relatively high, thermally conductive material, such as aluminum, coated with an electron beam sensitive material. The shaft screw also comprises relatively high thermally conductive material, such as copper, and has an internal passage leading from a source of cooling fluid, such as dry air, to a annular array of ports located in a distal portion of the supporting shaft screw. The distal portion of the shaft screw has a flaring cross section for increased heat transfer. A bellows encloses the distal portion forming a passageway so as to cause the cooling fluid to also flow along the external surface of the shaft screw. This arrangement adds to the effective convective heat transfer from the shaft screw to the cooling fluid. A rubber boot surrounds the proximate end of the shaft screw including an adjustable mounting pad to form a portion of the passageway and isolate high voltage potentials. A temperature sensitive detecting element is attached to the target member to sense changes in the temperature during operation. A controller responds to the sensed changes in the temperature and changes the flow rate of the cooling fluid to maintain the temperature relatively constant.
REFERENCES:
patent: 1253156 (1918-01-01), Coolidge
patent: 2091978 (1937-09-01), Gross
patent: 2352992 (1944-07-01), Von Henke
patent: 2453003 (1948-11-01), Edwards
patent: 2466329 (1949-04-01), Samson
patent: 3306975 (1967-02-01), Donnay
patent: 3524197 (1970-08-01), Soule
patent: 3536952 (1970-10-01), Findley
patent: 4064411 (1977-12-01), Iwasaki
patent: 4177400 (1979-12-01), Hergenrother et al.
DeMeo Palmer C.
Hamadi Diab
Hughes Display Products Corp. of Ky.
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