Cathode ray tube

Details Cathode ray tube Cathode ray tube

H - Electricity

01

J

313/35.323

H01J 31/08 (2006.01) H01J 29/46 (2006.01) H01J 29/62 (2006.01) H01J 29/72 (2006.01) H01J 31/26 (2006.01)

Patent

CA 1228112

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 ? 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.

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