Electron gun having an extended field electrostatic focus lens

Details Electron gun having an extended field electrostatic focus lens Electron gun having an extended field electrostatic focus lens

H - Electricity

01

J

313/35.323

H01J 29/48 (2006.01) H01J 29/62 (2006.01)

Patent

CA 1051500

ABSTRACT OF THE DISCLOSURE A television cathode ray tube has associated therewith a power supply for developing discrete supply voltages. A general purpose electron gun is depicted for receiving supply voltages from the power supply to produce a sharply focused beam of electrons at the cathode ray tube screen. The gun comprises associated cathode means and grid means for producing a beam of electrons, and novel focus lens means. The focus lens means receives electrons from the cathode means and a predetermined pattern of voltages from the power supply and comprises at least three electrodes for establishing a single continuous electrostatic focusing field characterized by having an axial potential distribution which at all times during tube operation, decreases smoothly and monotonically from a relatively intermediate potential to a relatively low potential spatially located at a lens intermediate position, and then increases smoothly, directly and monotonically from salt relatively low potential to a relatively high potential.

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