SU1395148A3 - Deflecting system with self-convergence for colour picture tube - Google Patents

Abstract

The invention relates to television technology and can be used in color kinescopes with a coplanar 1 position of electronic projectors. The purpose of the invention — improved raster correction — is achieved by correcting pincushion distortions. For this, magnet 5 creates lines of force 8 having the same direction as power lines 7, deflecting the field. The proposed arrangement of the magnets 5 in the plane of exit from the deflecting system is most effective for creating a corrective effect. Self-reducing effect from Lawn floor to guide the electron beams are neutralized by action of the magnet 6, which restores the self-converging effect conductive. The lines of force 9 created by the magnet 6 are directed opposite to the lines of force 7 of the deflecting field. This enhances the barrel shape of a vertically deflecting floor and increases self-contractive action, 3 times, 5 § СО

Description

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The invention relates to television technology and can be used in color kinescopes with komplat, the disposition of electronic projectors.

The aim of the invention is to improve the correction of the raster due to the correction of pincushion distortion.

The figure shows the deflection system, a longitudinal section; Fig 2 is the same, with cTopoHbi entering the electron beam system; fig with 3 - picture of magnetic field lines

The plastic case 1 of the deflecting system (OS) serves for fastening a pair of saddle-shaped horizontal deflecting coils 2, which are appropriately oriented with respect to the extension to the magnetic conductor 3, around which the windings of the vertical deflecting coils 4 OS are equipped with two correctors deflecting magnetic field. The first corrector is made in the form of two rod horizontally oriented permanent 5 ° magnets. These magnets are fixed on the case 1 of the OS in the upper and lower half-planes of its output. The second end plane is symmetrically relative to the horizontal plane of symmetry and magnetized in opposite directions. The second corrector can be made in the form of two laminar permanent magnets. These magnets are fixed on the housing 1 OS in the upper and lower half-planes of the central plane of its cross section from the inside the surface of the magnetic circuit 3 is symmetrical about the horizontal mioc-f of the bone of symmetry and are magnetized in the horizontal direction opposite to the direction of magnetization permanent magnets 5 of the first corrector The second corrector can also be made in the form of two plates of a magnetically permeable material. Barium ferrite is preferable as the material of permanent magnets 5 and 6

The correction of the deflecting magnetic field is carried out in the following way. Fig. 3 shows a portion of the magnetic field lines 7 of the barrel-shaped vertical deflecting field on the exit side of the OC to deflect the beams upward from the center of the screen of the kinescope. For correcting the pillow image

with

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Raster distortion magnet 5 creates power lines 8 having the same direction as the power lines 7 of the deflecting field. At the same time, the location of the magnets 5 precisely in the plane of the OS exit is most effective from the point of view of creating a corrective action. most significant in the center of the raster and less significant on the left and right sides, Therefore, the rays in the center deviate vertically for a greater distance than along the edge. This deflecting force has a direction opposite to the top of the pillow. However, under this action of the magnets 5, the self-reducing effect of the deflecting field on the electron beam is reduced. The action of the permanent magnets 6 restores the self-reducing effect of the force lines 9 of the magnetic field created by the magnet 6, directed oppositely with respect to the power lines 7 of the deflecting field. This enhances the barrel shape of the vertically deflecting field and increases the self-contractile effect. Instead of magnets 6, magnetoconductive plates can be installed. Such plates change the magnetic flux lines in the same way as permanent magnets.

Claims (1)

Formula of gain A self-deflecting deflecting system for a color kinescope with a complanar arrangement of electronic projectors, comprising a housing, an expanding magnetic circuit along the electron beams, a vertical deflection coil with a barrel-shaped heterogeneity of the field, and a horizontal deflection coil with a pillow-shaped heterogeneity of the field, about T and L and h and so that, with the aim of improving. The NIN raster correction due to the correction of pincushion distortions, the deflecting system is equipped with the first and second correctors of the deflecting magnetic field, while the first corrector is made in the form of two rods of horizontally oriented permanent magnets mounted on the case of the deflecting system in the upper and lower half planes of it. the output face plane is symmetrical with respect to the horizontal plane of symmetry and magnetized with respect to each other in opposite directions, and the second correction. The torus is made in the form of two plates of a magnetically permeable material fixed on the case of a deflecting system in the upper and lower half-planes of the central plane of its cross section from the inside. one the early surface of the magnetic circuit is symmetrical with respect to the horizontal plane of symmetry or in the form of two lamellar permanent magnets magnetized in the horizontal direction opposite to the direction of magnetization of the permanent magnets of the first corrector in the corresponding half-planes 5 1 // 1 NI / PC 9ig.2