Electron beam indicator tube

Details Electron beam indicator tube Electron beam indicator tube

H - Electricity

01

J

313/80, 313/1.1

H01J 31/15 (2006.01) H01J 19/38 (2006.01)

Patent

CA 1304441

ABSTRACT OF THE DISCLOSURE An electron beam indicator, for example, for a large- screen display which has a two-dimensional arrangement of a plurality of electron beam indicators. The electron beam indicator tube comprises fluorescent trios each of which have a plurality of fluorescent layers which function as picture elements, and a plurality of linear cathodes which are disposed respectively opposite to the fluorescent layers of the fluorescent trios. A common accelerating electrode is disposed between the fluorescent trios and control electrodes, and a separator structure is disposed so as to shield the fluorescent layers of each fluorescent trio. The common accelerating electrode is curved in the direction which the linear cathodes extend in a convex shape which bulged outwardly toward the fluorescent layers, and is formed so that the width of the electron beam transmission apertures decreases from the central portion toward the opposite ends. The electron beams which impinge on the separators of the separator structure are cut off by the accelerating electrode to which a low voltage is applied and hence the reactive current is reduced and luminous efficiency of the fluorescent layers is improved and the power consumption is reduced.

568114

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