Accession Number : ADD016334

Title :   Cold Field Emitters with Thick Focusing Grids.

Descriptive Note : Patent Application, filed 25 Feb 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Tang, Cha-Mei ; Ting, Antonio C ; Swyden, Thomas A

Report Date : 25 Feb 1994

Pagination or Media Count : 50

Abstract : A field emitter for producing an electron beam includes at least one cold cathode unit. Each of the cold cathode units Includes an emitter cone having an emitter tip and a gate spaced apart from the emitter tip for extracting electrons f rom the emitter tip in a propagation direction upon application of a positive dc voltage on the gate with respect to the emitter tip. The gate forms a gate cavity for propagation of the extracted electrons therethrough. Each of the cold cathode units further includes at least one lens electrode disposed further in the propagation direction from the emitter tip than the gate, the at least one lens electrode forming at least one lens cavity for propagation of the extracted electrons therethrough. The at least one lens electrode is for focusing the extracted electrons in part of the gate cavity, part of the at least one lens cavity, and part of the region therebetween.

Descriptors :   *EMITTERS, *PATENT APPLICATIONS, *COLD CATHODE TUBES, CATHODES, CAVITIES, ELECTRODES, ELECTRON BEAMS, FOCUSING, VOLTAGE, GATES(CIRCUITS), LITHOGRAPHY, X RAYS, DEFLECTION, AMPLIFIERS, DISPLAY SYSTEMS

Subject Categories : Electrical and Electronic Equipment
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE