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公开(公告)号：RO78240A
公开(公告)日：1982-04-12
申请号：RO7349573
申请日：1973-01-15
Applicant: RCA CORP
Inventor： HUGHES RICHARD H
Abstract: The three co-planar beams of an in-line gun are converged near the screen of a cathode ray tube by means of two plate-like grids transverse to the beam paths and having corresponding apertures for the three beams. The three beam apertures of the first grid are aligned with the three beam paths. The two outer beam apertures of the second grid are offset outwardly relative to the beam paths to produce the desired convergence. The three sets of apertures also provide separate focusing fields for the three beams. The second plate-like grid is formed with a barrel shape, concave toward the first grid, to minimize elliptical distortion of beam spots on the screen due to crowding of the adjacent focusing fields. Each of the two outer beams is partially shielded from the magnetic flux of the deflecting yoke by means of a magnetic ring surrounding the beam path in the deflection zone, to equalize the size of the rasters scanned on the screen by the middle and outer beams. Other magnetic pieces are positioned on opposite sides of the path of the middle beam, to enhance one deflection field while reducing the transverse deflection field for that beam.
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公开(公告)号：PL214828A1
公开(公告)日：1980-05-05
申请号：PL21482879
申请日：1979-04-11
Applicant: RCA CORP
Inventor： HUGHES RICHARD H , CHEN HSING-YAO
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公开(公告)号：CA1189561A
公开(公告)日：1985-06-25
申请号：CA419628
申请日：1983-01-17
Applicant: RCA CORP
Inventor： ASSIL NAIM Z , HUGHES RICHARD H
Abstract: An inline electron gun in a color picture tube is improved by the addition of two slot apertures that are spaced sufficiently close to and outward from the two outer apertures in a portion of a focusing electrode facing a screen grid electrode to cause a distortion of the electrostatic field formed between the two electrodes at the two outer apertures. The electrostatic field distortion causes two outer electron beams to converge toward a center electron beam.
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公开(公告)号：CA1177514A
公开(公告)日：1984-11-06
申请号：CA388303
申请日：1981-10-20
Applicant: RCA CORP
Inventor： HUGHES RICHARD H , MARKS BRUCE G
Abstract: RCA 76,103 The present invention relates to an improvement in a color picture tube having an inline electron gun for generating and directing a plurality of electron beams along coplanar paths toward a screen of the tube. The gun includes a main focus lens for focusing the electron beams. The improvement comprises a change in the two spaced gun electrodes that form the main focus lens. Each electrode includes a plurality of apertures therein equal to the number of electron beams. Each electrode also includes a peripheral rim, with the peripheral rims of the two electrodes facing each other. The apertured portion of each electrode is located within a recess set back from the rim. The recess has substantially straight wall sections parallel to the paths of the electron beams. A slot, for correcting for astigmatism formed by the main focus lens, is located between the main focus lens and the screen.
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Patent Agency Ranking
公开(公告)号：CA1138519A
公开(公告)日：1982-12-28
申请号：CA324578
申请日：1979-04-02
Applicant: RCA CORP
Inventor： HUGHES RICHARD H , CHEN HSING-YAO
Abstract: RCA 72,353 HIGH POTENTIAL, LOW MAGNIFICATION ELECTRON GUN 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 aperturedplate 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.
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公开(公告)号：DD157642A5
公开(公告)日：1982-11-24
申请号：DD22858281
申请日：1981-03-25
Applicant: RCA CORP
Inventor： HUGHES RICHARD H
Abstract: A 3-beam in-line electron gun comprises a pair of tub-shaped lens electrodes, each of which has three in-line apertures in its floor with tubular lips extending from the periphery of the apertures into the tubs. The lips of the lower voltage electrode are longer than the corresponding lips of the higher voltage electrode by an amount designed to either balance out the astigmatism of the fringe focus fields within the tubs or perferably to completely reverse the polarity of the overall astigmatism to at least partially compensate for the astigmatism of a self-converging yoke used with the gun.
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公开(公告)号：CA1131286A
公开(公告)日：1982-09-07
申请号：CA326103
申请日：1979-04-23
Applicant: RCA CORP
Inventor： HUGHES RICHARD H
Abstract: RCA 72,893 COLOR PICTURE TUBE HAVING IMPROVED ELECTRON GUN A color picture tube has an inline electron gun for generating and directing three electron beams, comprising a center beam and two outer beams, along coplanar paths toward a screen of the tube. The three beams pass through a deflection zone adapted to have vertical and horizontal magnetic deflection fields established therein. The improvement comprises the inclusion of first means for weakening the effect of a portion of the horizontal magnetic deflection field on the center electron beam. Such means include elongated magnetic members located between the outer beams and the center beam,with the direction of elongation being perpendicular to the plane of the electron beam paths. Also included are second means for weakening the effect of portions of both deflection fields on the two outer beams. The second means includes magnetic shield members completely surrounding each of the outer beam paths.
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公开(公告)号：PL215275A1
公开(公告)日：1980-03-24
申请号：PL21527579
申请日：1979-04-30
Applicant: RCA CORP
Inventor： HUGHES RICHARD H
Abstract: A color picture tube has an inline electron gun for generating and directing three electron beams, comprising a center beam and two outer beams, along coplanar paths toward a screen of said tube. The three beams pass through a deflection zone adapted to have vertical and horizontal magnetic deflection fields established therein. The improvement comprises the inclusion of first means for weakening the effect of a portion of the horizontal magnetic deflection field on the center electron beam. Such means include elongated magnetic members located between the outer beams and the center beam with the direction of elongation being perpendicular to the plane of the electron beam paths. Also included are second means for weakening the effect of portions of both deflection fields on the two outer beams. The second means includes magnetic shield members completely surrounding each of the outer beam paths.
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