Device for adjusting the electron beams of a color-picture tube
AssigneeInternational Standard Electric Corporation
InventorWalter Kornaker
Life of this patent
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Abstract
To adjust the convergence, raster and purity of an in-line color-picture tube, an oval magnetizable wire ring is mounted on the electron-gun system in such a way that its long axis lies in the plane of the electron beams. This arrangement permits both the conventional joint movement of the electron beams and movement of the beams independently of each other.
Claims9
A device for adjusting the convergence, purity and raster of a color-picture tube having an electron-gun system disposed in its neck and producing three coplanar electron beams which device comprises elongated means attached to the electron-gun system which is magnetizable from outside, wherein said means is closed except for at least one air gap, said means encloses a non-circular area perpendicular to the electron-beam plane and symmetrical about the point where the central electron beam passes through said area, and said area has a long axis lying in the electron-beam plane and a short axis perpendicular thereto.
Dependencies are inferred from the claim text.