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US 4,288,718 AGranted
Means and method for beam spot distortion compensation in TV picture tubes
AssigneeZenith Radio Corporation
InventorsAllen P. Blacker, Arthur J. Ingle
Life of this patent
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AssigneeZenith Radio Corporation
InventorsAllen P. Blacker, Arthur J. Ingle
Estimating the term…
A television cathode ray picture tube has at least one electron gun for generating at least one electron beam for projecting at least one beam spot on the picture imaging screen of the tube. The gun has a plurality of differently electrically charged electrodes having facing sections comprising juxtaposed walls with coaxially aligned openings therethrough for passage of said beam, said walls defining at least one gap in which is established a beam-focusing electrostatic field. The tube is subject to influences which introduce an undesired distortion of the beam spot to the detriment of the quality of the image projected on the screen. The electron gun is characterized by at least one of the electrode walls being mechanically deformed in the perimeter of its opening to cause the field to be azimuthally asymmetrical about the opening. The mechanical deformation is effective to act on the beam in a sense tending to at least partially compensate for the undesired distortion of the beam spot.
In a television cathode ray picture tube having at least one electron gun for generating at least one electron beam for projecting at least one beam spot on the picture imaging screen of said tube, said gun having a plurality of differently electrically charged electrodes having facing sections comprising juxtaposed walls with coaxially aligned openings therethrough for passage of said beam, said walls defining at least one gap in which is established a beam-focusing electrostatic field, said cathode ray tube being subject to influences which introduce an undesired distortion of said beam spot to the detriment of the quality of the image projected on said screen, said gun being characterized by at least one of said electrode walls being mechanically deformed in the perimeter of its opening to cause said field to be azimuthally asymmetrical about said opening, and effective to act on said beam in a sense tending to at least partially compensate for said undesired distortion of said beam spot.
For use in a television receiver system, a television color cathode ray picture tube of the small-neck, shadow-mask type having a picture-imaging screen with groups of red-light-emitting, green-light-emitting, and blue-light-emitting phosphor stripes deposited thereon, and having associated therewith a three-beam, unitized electron gun;
In a television cathode ray picture tube having at least one electron gun for generating at least one electron beam for projecting at least one beam spot on the picture imaging screen of said tube, said gun having a plurality of different electrically charged electrodes having facing sections comprising juxtaposed walls with coaxially aligned openings therethrough for passage of said beam, said walls defining at least one gap in which is established a beam-focusing electrostatic field, said cathode ray tube being subject to influences which introduce an undesired distortion of said beam spot to the detriment of the quality of the image projected on said screen, said gun being characterized by at least two of said juxtaposed walls being mechanically deformed in the perimeters of their openings to mutually interact and cause the field therebetween to be azimuthally asymmetrical about said openings and effective to act on said beam in a sense tending at least to partially compensate for said undesired distortion of said beam spot.
A method for at least partially compensating for an undesired distortion of a beam spot projected on the imaging screen of a television cathode ray picture tube by an electron gun, said gun having differently electrically charged electrodes having facing sections comprising juxtaposed walls with coaxially aligned openings therethrough for passage of said beam, said walls defining at least one gap in which is established a substantially azimuthally symmetrical electrostatic field, the method comprising designedly mechanically deforming in the perimeter of the opening at least one of said electrode walls to cause said field to be azimuthally asymmetrical about said opening, and effective to act on said beam in a sense to at least partially compensate for said undesired distortion of said beam spot.
A method for at least partially compensating for the undesired distortion of a beam spot projected on the imaging screen of a television cathode ray tube by at least one electron gun, said gun having a plurality of differently electrically charged electrodes having facing sections comprising juxtaposed walls with coaxially aligned openings therethrough for passage of said beam, said walls defining at least one gap in which is established a substantially azimuthally symmetrical electrostatic field, the method comprising designedly mechanically deforming in the perimeters of the openings of at least two of the electrodes having juxtaposed walls to mutually cause said field to be azimuthally asymmetrical about said openings, and effective to act on said beam in a sense to at least partially compensate for said undesired distortion of said beam spot.
Dependencies are inferred from the claim text.