Magnetism elimination method for CRT kinescope

Abstract

The invention discloses a method for degaussing a CRT kinescope. The method for degaussing includes the following steps: the CRT kinescope is degaussed by means of adopting gradually decaying alternating magnetic field generated by a degaussing coil; ferromagnetic parts with relatively high coercive force such as a shadow mask and an anti-explosion coil etc. are degaussed by the gradually decaying alternating magnetic field which is relatively strong generated by a main degaussing coil; and ferromagnetic parts with relatively low coercive force such as a shielding case etc. are degaussed by the gradually decaying alternating magnetic field which is relatively weak generated by a pair degaussing coil, thus optimizing the distribution of the degaussing magnetic field of the CRT kinescope, promoting the degaussing efficiency, decreasing the demand consumables for manufacturing the degaussing coil and reducing the cost.

Description

technical field [0001] The invention relates to a degaussing method for a CRT picture tube, in particular to a degaussing method for a CRT picture tube used in a CRT television or a computer monitor. The invention also relates to a degaussing device of a CRT picture tube capable of realizing the method. Background technique [0002] At present, although CRT monitors have been severely challenged by LCD monitors. However, CRT displays still have the irreplaceable advantages of LCD displays such as mature technology, low price, large viewing angle, short response time, and vivid colors, and are favored by some users. Such as figure 1 As shown, it is a schematic structural diagram of a picture tube, and a CRT picture tube includes a shadow mask plate 1, an explosion-proof ring 6, a degaussing coil 3, a fluorescent screen 4, a picture tube cone 5, an explosion-proof ring 6, and a shielding cover 7. Wherein the shadow mask plate 1, the explosion-proof ring 6, the shielding cov...

AI Technical Summary

Problems solved by technology

like figure 1 Shown, be the traditional degaussing method of existing CRT picture tube, promptly adopt a degaussing coil 3, in order to produce the high-strength degaussing magnetic field of wide range, this degaussing magnetic field must be able to make the most serious parts of magnetization (as shadow mask Plate 1, explosion-proof ring 6, etc.) can demagnetize enough strength to produce such a large-scale, high-intensity degaussing magnetic field must be realized by a degaussing coil with a large size and a high number of ampere turns, but a part of the ferromagnetic components in the CRT picture tube is composed of relatively The other part is made of high coercivity material (such as shadow mask 1, explosion-proof ring 6, etc.), and the other part is made of lower coercivity material (such as shield cover 7, etc.), and this part of low coercivity material parts does not A high-intensity degaussing magnetic field is required for degaussing, which results in a waste of material resources and an increase in product cost

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