Electrostatic and dynamic magnetic control of cathode ray for distortion compensation
AssigneeSony Corporation
InventorsTsunenari Saito, Yoshio Aoki
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Abstract
A cathode ray tube is disclosed in which an electron beam is deflected to scan a phosphor screen for producing a picture thereon, and which has an electrostatic beam control device for deforming the cross section of the beam so as to compensate for the distortion in shape of the beam landing spot on the screen at its peripheral portion caused by the beam deflection and a magnetic beam control device for deforming the cross-section of the beam dynamically in response to the beam deflection so as to compensate for the distortion in shape of the beam landing spot on the screen at its central portion caused by the electrostatic beam control device.
Claims9
A cathode ray tube having an envelope provided with a phosphor screen thereon, comprising:
- a. beam generating means for emitting at least one electron beam toward said screen to be deflected at a region between said beam generating means and said screen to scan said screen;
- b. electrostatic beam control means located to affect said beam between said beam generating means and said region and operable on said electron beam for deforming the crosssectional shape of said electron beam to compensate for the distortion in shape of the beam landing spot on said screen at its peripheral portion casued by beam deflection;
- and
- c. magnetic beam control means located to affect said beam between said beam generating means and said region and operable on said electron beam for further deforming the cross-sectional shape of said electron beam dynamically in synchronism with the beam deflection to compensate for the distortion in shape of the beam landing spot on said screen at its central portion caused by said electrostatic beam control means.
Dependencies are inferred from the claim text.