H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.323
H01J 29/48 (2006.01) H01J 29/02 (2006.01) H01J 29/50 (2006.01) H01J 29/62 (2006.01)
Patent
CA 1138519
RCA 72,353 HIGH POTENTIAL, LOW MAGNIFICATION ELECTRON GUN Abstract The electron gun, which is especially adapted for use in color picture tubes, comprises in the order named: a cathode, an apertured-plate control grid, an apertured- plate screen grid, and at least two tubular focusing electrodes. The quality of the gun's beam spot is improved by: 1. Establishing an operating electric field between the screen grid and first focusing electrode which is between about 100 and 400 volts/mil (3937-15748 volts/mm), thereby reducing aberration effects in the beam-forming region of the gun; 2. Making the screen grid thick so as to prevent the high first focusing electrode voltage from penetrating the region between the control grid and screen grid, thereby allowing the control grid-screen grid field to provide a divergent effect on the electron beam prior to beam crossover and thus give a reduced crossover angle; 3. Elongating the first focusing electrode to provide an optimum filling of the main focus lens with the beam to maximize the object distance of the focusing system; and 4. Structuring the screen grid and first focusing grid to provide a flat electrostatic field therebetween to avoid prefocusing action in that region, so as not to cause an effective reduction of the object distance of the focusing system.
324578
Chen Hsing-Yao
Hughes Richard H.
Morneau Roland L.
Rca Corporation
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