US 4,707,634 A · Cathode ray tube

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, 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 has a high-tension electrode and a low-tension electrode positioned along the electron beam path to focus the electron beam. The low-tension electrode is divided into four arrow or zig-zag patterns to deflect the electron beam. The length l between the electron beam source and the mesh electrode and the length x of the high-tension electrode are selected to optimize the magnification, aberration and landing error of the electrostatic lens means.

Claims2

Dependent claims

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 electrostatic lens means positioned between said electron beam source and said mesh electrode and including a cylindrical focussing electrode G'.sub.5, said means having a high-voltage electrode and a neighboring low-voltage electrode respectively positioned along said electron beam path to focus said electron beam, said low-voltage electrode being divided into four arrow or zig-zag patterns to deflect said electron beam and wherein one of the cylindrical focussing electrodes G'.sub.5 has been substantially shortened.

3 more elements

Dependencies are inferred from the claim text.

Cathode ray tube

Life of this patent

Cathode ray tube

Life of this patent

Abstract

Claims2