Cathode ray tube

Details Cathode ray tube Cathode ray tube

H - Electricity

01

J

313/35.32

H01J 29/58 (2006.01) H01J 29/50 (2006.01) H01J 29/56 (2006.01) H01J 29/62 (2006.01)

Patent

CA 1194081

16 ABSTRACT: "Cathode ray tube". The spherical aberration can be drastically reduced by providing a curved electrically conductive foil or gauze in the second electrode, viewed in the direction of propagation of the electron beam, of an accelerating lens of an electron gun. The curvature of the foil or gauze according to the invention must initially decrease with an increasing distance from the optical axis of the electron lens. The curvature preferably varies according to a zero order Bessel function. The spherical aberration can even be made negative by providing a cylindrical collar which extends from the foil or gauze in the direction of the first electrode of the lens.

421850

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