Cathode ray tube

Details Cathode ray tube Cathode ray tube

H - Electricity

01

J

313/35.13

H01J 29/56 (2006.01) H01J 29/48 (2006.01) H01J 29/50 (2006.01) H01J 29/62 (2006.01)

Patent

CA 1221724

14 ABSTRACT: Cathode ray tube. A cathode ray tube comprising in an evacuated envelope (1) an electron gun system (5, 104) for generating at least one electron beam (6, 7, 8, 105) which is focused on a target (10, 108) by means of at least one accelerating electron lens (22, 23, 50, 51) which, viewed in the direction of propagation of the electron beam, comprises a first (22, 50) and a second (23, 51) electrode separated by a lens gap (30, 53) in which second electrode an electrically conductive foil or gauze (31, 52) which intersects the beam is provided at a distance from the lens gap. When in such a tube the foil or gauze is flat and is provided at such a location that it holds that 0.25<1/R<2.0 wherein 1 is the distance from the foil or gauze to the lens gap and R is the radius of the part of the second electrode in which or against which the foil or gauze is provided the spherical aberration in the electron beam is drastically reduced. Such a flat gauze moreover is easy to manufacture and assemble in an electron gun.

476559

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