Color cathode-ray tube apparatus

Abstract

In a deflection device 30, a first magnetic field generating body TG that generates a magnetic field having the same polarity with a vertical deflection magnetic field at the time of upward deflection is installed on the upper side than XZ plane, a second magnetic field generating body BG that generates a magnetic field having the same polarity with a vertical deflection magnetic field at the time of downward deflection is installed on the lower side than the XZ plane, a third magnetic field generating body TIMg that generates a magnetic field having opposite polarity to the vertical deflection magnetic field at the time of upward deflection is equipped on the upper side than the XZ plane, and a fourth magnetic field generating body BIMg that generates a magnetic field having opposite polarity to the vertical magnetic field at the time of downward deflection is equipped on the lower side than the XZ plane. The first and the second magnetic field generating bodies are arranged on the opposite side with respect to a tube axis in relation to the outermost peripheral edge of a phosphor screen 14 side of a core 36 separated from the core. The third and the fourth magnetic field generating bodies are arranged between the core and a separator 38, nearer to the phosphor screen side than the center position in the tube axis direction. Thus, it reduces variations of raster distortion characteristics related to temperature variations simply and inexpensively.

Description

technical field [0001] The present invention relates to color cathode ray tube devices used in TVs, monitors and the like. Background technique [0002] At present, a so-called self-converging linear type color cathode ray tube device is widely used. The color cathode ray tube device includes: a linear (in-line arrangement) electron gun, which emits three electron beams arranged in a row formed by a central electron beam passing through the same horizontal plane and a pair of side electron beams on both sides thereof; A device that produces a pillow-shaped horizontal deflection magnetic field and a barrel-shaped vertical deflection magnetic field; and a pair of up and down or a pair of up and down and a pair of left and right permanent magnets, in order to assist the horizontal and vertical deflection magnetic fields, set in the deflection device Screen side opening ends. In this color cathode ray tube device, these electron guns and deflectors are combined so that three e...

AI Technical Summary

Problems solved by technology

Furthermore, there is a problem that the deflection device becomes complicated and expensive

[0017] According to the magnetic temperature compensation device disclosed in Patent Document 3, although changes in grating distortion characteristics due to temperature changes can be reduced, there is a problem that special components with a positive temperature coefficient used together with a general-purpose magnet with a negative temperature coefficient are expensive

[0018] According to the two pairs of magnets disclosed in Patent Document 4 and Patent Document 5, although the upper and lower grating distortions are improved, the changes in the grating distortion characteristics caused by temperature changes cannot be sufficiently reduced

In addition, the linearity and convergence of the left and right gratings cannot be realized at the same time only by adjusting the magnetic field distribution of the deflection device

Therefore, in order to correct the raster distortion on the left and right, for example, a correction circuit needs to be added to a TV set, and there is a problem that the device becomes complicated and expensive.

[0019] According to the two pairs of magnets disclosed in Patent Document 6 and Patent Document 7, although the upper and lower grating distortions are improved, the changes in the grating distortion characteristics caused by temperature changes cannot be sufficiently reduced

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