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OwnerHirofumi Nakamura, Hideki Miyazaki +3inventors
InventorsHirofumi Nakamura, Hideki Miyazaki, Masatoki Morimoto, Kouji Shibusa, Toshinori Suzuki
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The present invention achieves a screen of high luminance with an excellent focus characteristic. The tip of a cathode is formed, for example, in a plane shape or a curved surface shape. The tip formed in the plane shape or curved surface shape is used as an electron emission face and is allowed to either enter a hole in a first grid or enter the hole to project from the first grid. An electron beam emitted from the electron emission face can be made almost a parallel beam. Even when the beam current amount is increased, an almost parallel beam can be obtained. Thus, a screen of high luminance can be obtained with an excellent focus characteristic.
(amended) An electron gun comprising a cathode having a tip thereof, said tip being formed in a plane shape, said tip being used as electron emission face and entering a hole in a first grid to project from said first grid.
(Amended) An electron gun comprising a cathode having a tip thereof, said tip being formed in a convex-shaped curved surface, said convex-shaped curved surface being used as electron emission face and entering a hole in a first grid to project from said first grid.
(Amended) A cathode ray tube comprising an electron gun including a cathode having a tip thereof, said tip being formed in a plane shape, said tip being used electron emission face and entering a hole in a first grid to project from said first grid.
(Amended) A cathode ray tube comprising an electron gun including a cathode having a tip thereof, said tip being formed in a convex-shaped curved surface, said convex-shaped curved surface being used as electron emission face and entering a hole in a first grid to project from said first grid.
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(Amended) An image display device comprising:
(Amended) An image display device comprising:
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Dependencies are inferred from the claim text.