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US 4,361,781 AGranted
Multiple electron beam cathode ray tube
AssigneeInternational Business Machines Corporation
InventorsSteven W. Depp, Bruce P. Piggin
Life of this patent
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Abstract
A multiple electron beam cathode ray tube has a plurality of cathodes in a plane to form an array. Grids on the same substrate are positioned in spaced relation about the cathodes so that a plurality of individually controlled electron beams are formed when appropriate potentials are applied to the cathodes and grids.
Claims7
An integral structure for use in a cathode ray tube having a fluorescent screen device comprising:
- an electrically insulating substrate,
- a plurality of cathodes on said substrate to form an array,
- a heater associated with said substrate for heating said cathodes and
- a plurality of grids on said substrate positioned in spaced relation around and individually surrounding said cathoder said cathodes so as to be substantially coplanar therewith wherein a plurality of individually controllable electron beams are formed which would subsequently strike the screen when appropriate potentials are applied to said cathodes and grids.
1 more element
Dependencies are inferred from the claim text.