Electron gun having a two piece screen grid electrode means

Details Electron gun having a two piece screen grid electrode means Electron gun having a two piece screen grid electrode means

H - Electricity

01

J

313/35.14

H01J 29/50 (2006.01)

Patent

CA 1237464

RCA 79,987 Abstract of the Disclosure An inline electron gun for a cathode-ray tube includes an improved beam forming region comprising three cathodes, a control grid and a novel screen grid electrode means, the latter comprising two spaced apart metal members. In one embodiment, the first member closest to the control grid is relatively thick and has three slots formed in one surface thereof facing away from the control grid. Circular apertures are formed within the slots and extend through the body of the first member. The second member has three circular apertures therethrough aligned with the circular apertures in the first member. When a dynamic signal is superimposed on the DC bias voltage and applied to the second member, the first member shields the control grid from the dynamic signal so that little or no brightness modulation occurs. In a second embodiment, the first and second members of the screen grid are structurally interchanged. In a third embodiment, the first and the second members have orthogonally disposed rectangular slots formed in facing surfaces.

491668

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