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US 4,398,166 AGranted
Compensator for CRT deflection yokes and the like
AssigneeNorthern Telecom Limited
InventorDonald L. Bumgardner
Life of this patent
Estimating the term…
Abstract
A compensator for CRT deflection yokes and the like comprises a housing shaped for connection with the deflection yoke, and at least one magnet rotatably mounted therein. Selective rotation of the magnet alters the electromagnetic field produced by the deflection yoke to alleviate distortion in the CRT display. A detented spring arrangement positively and releasably retains the magnet in a set, adjusted angular position in the housing.
Claims14
A compensator for CRT deflection yokes and the like, comprising:
- a housing adapted for fixed mounting adjacent a CRT deflection yoke;
- at least one magnet;
- a wheel comprising a manually rotatable carrier for said magnet, said wheel including means for carrying said magnet adjacent to and generally in the same plane with said wheel;
- means for rotatably mounting said wheel and the said magnet carried therewith upon said housing;
- and
- means for positively and releasably engaging said wheel to thereby retain said magnet in a selected position of wheel rotation with respect to said housing, to thereby enhance selective positioning of said magnet altering the effective electromagnetic field produced by the deflection yoke to alleviate distortion in the CRT display, and to maintain such selected magnet position;
- said housing being adapted for mounting in a position in which it at least partially encircles the longitudinal axis of the CRT with the housing disposed in a plane generally perpendicular to said CRT axis, and said magnet having oppositely-disposed poles and being carried by said wheel for rotation about an axis disposed generally perpendicular to said plane of said housing and generally parallel to the said CRT axis.
4 more elements
A compensator for CRT deflection yokes and the like, comprising:
- a housing adapted for fixed mounting adjacent a CRT deflection yoke;
- at least one magnet;
- a wheel comprising a manually rotatable carrier for said magnet, said wheel including means for carrying said magnet adjacent to and generally in the same plane with said wheel and for mounting said magnet in said wheel generally coaxially therewith;
- means for rotatably mounting said wheel and the said magnet carried therewith upon said housing;
- and
- means for positively and releasably engaging said wheel to thereby retain said magnet in a selected position of wheel rotation with respect to said housing, to thereby enhance selective positioning of said magnet altering the effective electromagnetic field produced by the deflection yoke to alleviate distortion in the CRT display, and to maintain such selected magnet position;
- said means for releasably engaging said wheel means comprising a spring-biased member contacting the circumferential periphery of said wheel.
4 more elements
A compensator as set forth in claim 5, including:
- a second magnet rotatably carried by a second wheel mounted in said housing adjacent said first-named wheel and magnet, for rotation in a substantially parallel plane therewith.
A compensator for CRT deflection yokes and the like, comprising:
- a housing adapted for fixed mounting adjacent a CRT deflection yoke;
- at least one magnet;
- a wheel comprising a manually rotatable carrier for said magnet, said wheel including means for carrying said magnet adjacent to and generally in the same plane with said wheel;
- means for rotatably mounting said wheel and the said magnet carried therewith upon said housing;
- and
- means for positively and releasably engaging said wheel to thereby retain said magnet in a selected position of wheel rotation with respect to said housing, to thereby enhance selective positioning of said magnet altering the effective electromagnetic field produced by the deflection yoke to alleviate distortion in the CRT display, and to maintain such selected magnet position;
- said magnet being mounted upon said wheel to rotate therewith;
- said wheel including a partially-exposed peripheral edge which is serrated;
- and
- said wheel-engaging means comprising a spring member engaging said serrated wheel edge to provide ratcheting detented wheel position retention.
7 more elements
A compensator for CRT deflection yokes and the like, comprising:
- a housing adapted for fixed mounting adjacent a CRT deflection yoke;
- at least one magnet;
- a wheel comprising a manually rotatable carrier for said magnet, said wheel including means for carrying said magnet adjacent to and generally in the same plane with said wheel;
- means for rotatably mounting said wheel and the said magnet carried therewith upon said housing;
- and
- means for positively and releasably engaging said wheel to thereby retain said magnet in a selected position of wheel rotation with respect to said housing, to thereby enhance selective positioning of said magnet altering the effective electromagnetic field produced by the deflection yoke to alleviate distortion in the CRT display, and to maintain such selected magnet position;
- said housing being split in a plane generally perpendicular to the axis of said CRT and including two portions between which said wheel is disposed.
4 more elements
A compensator for CRT deflection yokes and the like, comprising:
- a housing adapted for fixed mounting adjacent a CRT deflection yoke;
- at least one magnet;
- a wheel comprising a manually rotatable carrier for said magnet, said wheel including means for carrying said magnet adjacent to and generally in the same plane with said wheel;
- means for rotatably mounting said wheel and the said magnet carried therewith upon said housing;
- and
- means for positively and releasably engaging said wheel to thereby retain said magnet in a selected position of wheel rotation with respect to said housing, to thereby enhance selective positioning of said magnet altering the effective electromagnetic field produced by the deflection yoke to alleviate distortion in the CRT display, and to maintain such selected magnet position;
- said housing including mounting means comprising a pair of barbed prongs extending from opposite sides of said housing and molded integrally therewith, said prongs having a shape adapting them to engage portions of said CRT deflection yoke, to thereby retain said housing thereupon.
4 more elements
Dependencies are inferred from the claim text.