Color cathode-ray tube apparatus

Abstract

A pair of upper and lower magnetic field generators TG, BG are disposed in the vicinity of the end of a deflection device 30 on a phosphor screen 14 side so as to sandwich a horizontal plane. A pair of upper and lower coma aberration correction coil systems 60 in each of which a coil is wound around a substantially U-shaped core are disposed on an electron gun 16 side from a vertical deflection coil 34 so as to sandwich the horizontal plane. A pair of upper and lower magnetic members 70 are disposed between the vertical deflection coil 34 and a separator 38 so as to sandwich the horizontal plane. The angle thetac defined by inner tips of two legs of the substantially U-shaped core and a tube axis viewed along the tube axis satisfies 10 DEG <=thetac<=42 DEG . This makes it possible with a simple configuration and at low cost to correct coma aberration, misconvergence, and pincushion raster distortion in upper, lower, left and right portions of a screen, and to prevent cropping or clipping of images on the screen due to occurrence of BSN.

Description

technical field [0001] The present invention relates to color cathode ray tube devices for TVs, monitors, and the like. Background technique [0002] Currently, so-called self convergence-inline color cathode ray tube devices are widely used. This color cathode ray tube device includes: an inline electron gun emitting three electron beams arranged in a row consisting of a central electron beam passing through the same horizontal plane and a pair of side electron beams on both sides thereof; A horizontal deflection coil for forming a horizontal deflection magnetic field and a vertical deflection coil for producing a barrel-shaped vertical deflection magnetic field; at least a pair of upper and lower permanent magnets, in order to assist the horizontal and vertical deflection magnetic fields, are arranged on the edge of the screen side opening of the deflection device; and a For the auxiliary coil unit, it is used to correct the coma aberration provided on the electron gun si...

AI Technical Summary

Problems solved by technology

[0020] The present invention is made to solve the above-mentioned problems of conventional color cathode ray tube devices, and its object is to provide a color cathode ray tube device that does not use complicated and expensive auxiliary coil devices including E-shaped magnetic cores. The auxiliary magnetic field generating device can correct coma aberration and misconvergence simply and cheaply, and can correct the pincushion distortion of the raster on the top, bottom, left, and right of the screen, and can also realize at low cost that there is no display defect in the screen caused by the generation of BSN good image quality

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