Projection television display tube with cooling means and displa

Details Projection television display tube with cooling means and displa Projection television display tube with cooling means and displa

1989-01-18

1990-02-06

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Envelope

313 22, 313 35, 313 44, 313 45, 358245, H01J 2986, H01J 520

Patent

active

048990809

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 differences in said cooling liquid. When in such a projection television display tube at the area of the windows (4, 6) and around the said 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 said space, an effective cooling is obtained at a power between 12 and 25-30 W without external pipes or a heat exchanger. As a result of the circulation of the cooling liquid around the tube end at the area of the windows there is a good temperature compensation so that fewer stresses occur in the glass of the display tube.

REFERENCES:
patent: 4529905 (1985-07-01), Ohkoshi et al.
patent: 4651047 (1987-03-01), Comberg et al.

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