Convergence correcting device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTakayuki Nakane
Life of this patent
Estimating the term…
Abstract
A convergence correcting device movable in the direction of horizontal deflection axis comprising a first pair of magnetic pieces disposed at a specific interval on both sides of electron beams on the horizontal deflection axis, and a second pair of magnetic pieces disposed at a specific interval on both sides of the electron beams on a vertical deflection axis. These magnetic pieces are disposed between a deflection yoke and a subsidiary yoke. In this simple structure, the YV axis deviation due to correction of XH axis deviation can be canceled, and by setting the intervals of the first and second pair of magnetic pieces at proper values, the XH axis deviation can be easily corrected to a practically ignorable level without causing YV axis deviation.
Claims15
A convergence correcting device for correcting convergence of a color image display device comprising:
- a color picture tube, having an inline type electron gun for generating three electron beams along a horizontal deflection axis:
- a deflection yoke for deflecting said three electron beams along said horizontal deflection axis and a vertical deflection axis;
- a subsidiary yoke, composed of a multipolar core, disposed at said electron gun side of said deflection yoke;
- a first pair of magnetic pieces, movable along said horizontal deflection axis, while mutually keeping a first interval, aligned with said electron gun on said horizontal deflection axis;
- a second pair of magnetic pieces, movable along said horizontal deflection axis, while mutually keeping a second interval, aligned on said vertical deflection axis;
- and
- a base body on which said first pair of magnetic pieces are mounted at said first interval, and said second pair of magnetic pieces are mounted at said second interval, said base body being movable along said horizontal deflection axis;
- wherein two distances from one and the other of said second pair of magnetic pieces to said electron gun are equal, if moving along said horizontal deflection axis, so that a relative configuration of said first and second pairs of magnetic pieces may be maintained.
A convergence correcting device for correcting convergence of a color image display device, comprising:
- a color picture tube, having inline type electron gun for generating three electron beams along a horizontal deflection axis;
- a deflection yoke for deflecting said three electron beams along said horizontal deflection axis and a vertical deflection axis;
- a subsidiary yoke, disposed of a multipolar core, disposed at said electron gun side of said deflection yoke, wherein a vertical coma correcting coil is wound on said subsidiary yoke;
- a pair of magnetic pieces, movable along said horizontal deflection axis while mutually keeping a specific interval, aligned with said electron gun on said horizontal deflection axis;
- a set of four magnetic pieces, moveable along said horizontal deflection axis, being disposed on each apex of a rectangle having a first pair of sides parallel to said vertical deflection axis, and a second pair of sides parallel to said horizontal deflection axis;
- and
- a base body on which said pair of magnetic pieces are mounted at said specific interval, wherein said base body is movable along said horizontal deflection axis and said set of magnetic pieces are mounted at a position of each peak of said rectangle;
- wherein two distances from one and the other of said set of magnetic pieces disposed at both ends of each of said first sides to said electron gun are mutually equal, if moving along said horizontal deflection axis, so that a relative configuration of said pair of magnetic pieces and said set of magnetic pieces may be maintained.
Dependencies are inferred from the claim text.