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US 4,734,613 AGranted
Liquid cooled display tube
AssigneeU.S. Philips Corporation
InventorsGerritt B. Gerritsen, Willem M. Van Alphen
Life of this patent
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Abstract
An efficiently cooled display tube is obtained by pumping a low viscosity liquid having a high heat capacity through a cooling space less than 1 mm. thick on the outside of the display window. A chamber is smoothly connected to the inlet aperture of the cooling space to assure a laminar flow, eliminating swirls which could give rise to refractive patterns in the display picture.
Claims5
A display tube comprising
- an evacuated envelope in which an electron beam is generated
- a substantially rectangular display window having an inside surface in said envelope and an opposed outside surface, said inside surface having a display screen thereon,
- a light transmitting second window outside of said envelope substantially parallel to said outside surface of said display window,
- a light transmitting cooling liquid flowing between said display window and said second window
- a substantially rectangular space through which said cooling liquid flows between said windows, said space having a depth defined by the spacing between said windows, said spacing being less than 1 mm, said space having opposed inlet and outlet apertures, said apertures having substantially the same dimensions as a cross section of said space at right angles to the direction of flow,
- a chamber having dimensions exceeding the spacing between said windows, said inlet aperture opening smoothly into said chamber, whereby,
- the influence of different refractive indices between the cooling liquid and said windows is small.
4 more elements
Dependencies are inferred from the claim text.