Electrostatic shutter tube having substantially orthogonal pairs of

Abstract

An electrostatic shutter tube comprises a photocathode adapted to emit electrons along a path as an electron image in response to a radiant image incident upon the photocathode. A phosphor screen is spaced from the photocathode and is adapted to emit a light image in response to the impingement of the electron image thereon. A shuttering grid is disposed in the electron path between the photocathode and the phosphor screen to control the emission of the electron image. An anode member adjacent to the screen has therein a pair of primary deflection plates disposed along the electron path for deflecting the electron image in a first direction across the screen. A pair of secondary deflection plates are disposed within the anode member, along the electron path, in a cross-over region of the electron image. The pair of secondary deflection plates are substantially orthogonal to the pair of primary deflection plates and provide deflection of the electron image in a second direction across the screen, which is different from the first direction.