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

1974-08-02

1976-11-30

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

315382, 315 31TV, 313449, H01J 2946, H01J 2956

Patent

active

039951944

ABSTRACT:
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 said relatively low potential to a relatively high potential.

REFERENCES:
patent: 2227034 (1940-12-01), Schlesinger
patent: 2931937 (1960-04-01), Dufour
patent: 2971118 (1961-02-01), Burdick
patent: 3090882 (1963-05-01), Benway
patent: 3411029 (1968-11-01), Karr
patent: 3732457 (1973-05-01), Ueno et al.

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