Projection television display tube having coolant circulated...

Details Projection television display tube having coolant circulated... Projection television display tube having coolant circulated...

H - Electricity

01

J

313/9

H01J 29/86 (2006.01) H01J 29/00 (2006.01)

Patent

CA 1243069

13 ABSTRACT: Projection television display tubes having an evacuated envelope (1) with a display window (4) which on its inside comprises a display screen (5) and in front of which a light permeable second window (6) is provided on its outside, a cooling liquid (16) flowing through the space (7) between the display window (4) and the second window (6) from at least one inlet aperture to at least one outlet aperture (17) namely by temperature differ- ences in the cooling liquid. When in such a projection television display tube at the area of the windows (4, 6) and around the space (7) a cooling jacket (8) is provided which comprises at least one duct (9) which transports the cooling liquid (6) from the outlet aperture(s) to the inlet aperture(s) of the space, an effective cooling is obtained at a power betwen 12 and 25-30 W without exter- nal pipes or a heat exchanger. As a result of the circu- lation of the cooling liquid around the tube end at the area of the windows there is a good temperature compensa- tion so that fewer stresses occur in the glass of the dis- play tube.

482869

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