Storage cathode ray tube having auxiliary coils to correct non-symmetrical geometry
AssigneeTektronix, Inc.
InventorsJohnnie Everett Schmauder, James Kipling Richardson
Life of this patent
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Abstract
A storage cathode-ray-tube having a single off-axis flood gun is described including auxiliary coils defining electromagnets placed, one electromagnet on either side of the cathode-ray-tube to correct non-symmetrical geometry in optical representations produced on the fluorescent screen of the cathode-ray tube caused by interaction of the conventional principle electron beam under the control of electrical signals during storage operation.
Claims1
A storage cathode-ray-tube having auxiliary coils to correct non-symmetrical geometry of an image caused by electron-electron interaction of writing and storing electron beams, comprising:
- faceplate means including a storage target for providing an image producing means;
- means for bombarding said faceplate means with high velocity electrons emitted from a single on axis writing electron gun to produce an image on said storage target;
- means for simultaneously bombarding said faceplate means with uniformly distributed flood beam electrons emitted from a single off axis flood electron gun to retain said image;
- and
- an auxiliary set of "Hemholtz" coils disposed between said faceplate means and said flood electron gun and on opposite sides of the cathode-ray-tube, said coils connected to receive said flood beam electrons for producing a correcting field proportional to said flood beam electrons for compensating the electron-electron interaction thereby substantially eliminating non-symmetrical geometry of the image.
Dependencies are inferred from the claim text.