Cathode ray tube which is small and uses a small amount of power
AssigneeSony Corporation
InventorsTakehiro Kakizaki, Shoji Araki
Life of this patent
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Abstract
A cathode ray tube comprises an envelope; an electron beam source positioned at one end of the envelope; a target positioned at another end of the envelope opposite to the electron beam source; a mesh electrode positioned opposite to the target; and an electrostatic lens means positioned between the electron beam source and the mesh electrode, the lens means having a first electrode, a second electrode and a third electrode respectively positioned along the electron beam path to focus the electron beam, the second electrode being divided into four arrow or zig-zag patterns to deflect the electron beam.
Claims1
A cathode ray tube comprising:
- (a) an envelope;
- (b) an electron beam source positioned at one end of said envelope;
- (c) a target positioned at another end of said envelope opposite to said electron beam source;
- (d) a mesh electrode positioned opposite to said target;
- and
- (e) an electrode lens means positioned between said electron beam source and said mesh electrode, said lens means having a first electrode, a second electrode and a third electrode respectively positioned along said electron beam path to focus said electron beam, said second electrode being divided into four arrow or zig-zag patterns to deflect said electron beam, and wherein the length between said electron beam source and said mesh electrode is in the range 2.phi. to 4.phi. where .phi. is the inner diameter of said first, second and third electrodes.
Dependencies are inferred from the claim text.