Inner magnetic shield material for cathode ray tube and process for producing the same

A magnetic shielding material and magnetic shielding technology, applied in cathode ray tube/electron beam tube, inorganic material magnetism, metal material coating process, etc., can solve the problems of shortened service life of CRT, easy to fall off, and electron gun rupture.

Inactive Publication Date: 2005-08-31
NITTETABU STEEL SHEET CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, for these thin-layer or needle-like hematite crystals (hereinafter referred to as thin-layer hematite), it is easy to fall off, and if the fallen hematite particles are bonded to the electron gun, there is a possibility that the electron gun will break. Danger
Therefore, the service life of the CRT is reduced if the iron oxide film (rust) formed during the sealing step is in the form of lamellar hematite, and thus the formation of lamellar hematite is unacceptable for internal magnetic shielding materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] A 0.15 mm thick cold-rolled steel bar manufactured by hot-rolling and cold-rolling a low-carbon, aluminum-deoxidized steel having the composition shown in Table 1 (remainder: Fe and unavoidable impurities) was used as a base material. The cold-rolled steel bar passes through the 800°C N in the continuous annealing device 2 Annealed by heat treatment in atmosphere for 5 seconds, and then leveled. In this example, the rolls used in the skin pass and the rolling conditions were changed in order to adjust the surface roughness of the steel bar.

[0113] the element

C

Si

mn

P

S

quality%

0.002

0.01

0.25

0.009

0.003

[0114] In this example, the internal magnetic shielding material was prepared as follows: Cold-rolled steel strips with a surface roughness (Ra) of 0.5 μm were pretreated on a continuous production line using the method shown in Table 2, and then coated by roll coating. The resin coating comp...

Embodiment 2

[0137] On the pretreated cold-rolled steel strip, a urethane-based organic resin coating film was formed in the same manner as described in Example 1. The cold-rolled steel strip, the pretreatment method and the thickness of the resin coating film used are all the same as in Example 1. The results of coating properties and reddishness examined in the same manner as in Example 1 are shown in Table 3.

[0138] In the present embodiment, the pretreatment was carried out by the method shown in Table 3, and formed the following four different types of organic resin coating films:

[0139] - films (indicated by A) consisting only of organic resin A;

[0140] - a film containing coupler B in the resin (indicated by A+B);

[0141] - films containing metal oxide C in resin (denoted by A+C); and

[0142] - A film containing both the coupling agent B and the metal oxide C in the resin (indicated by A+B+C).

[0143] Organic resin A is the resin of the same commercially available water...

Embodiment 3

[0148] Except that waxes with different average particle diameters were further added to the coating film in different amounts, the organic resin coating film was tested under the same conditions as the organic resin coating film A+B+C in Experiment No. 1 of Tables 1 and 2. form.

[0149] Therefore, the cold-rolled steel bar with a surface roughness of 0.5 μm is pretreated sequentially by alkali deoiling→hot water washing→application solution (1) (sulfuric acid solution)→hot water washing. Therefore, on the same production line, a steel bar was coated with the resin coating composition on a roll, and baked in the same manner as in Example 1 to form resin coating films with different thicknesses. The coating composition used was the same commercially available urethane-based aqueous coating composition as used in Example 1, to which was added the same silane in the same amount as in Example 2, in addition to the wax Coupling agent and silica gel.

[0150] Table 4 shows the aver...

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PUM

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Abstract

An inner magnetic shield material for fabricating an inner magnetic shield to be disposed in a color cathode ray tube, which comprises a steel strip having at least one major surface thereof provided with a coating of organic resin composed essentially of C and H, or C, H and O, or C, H, O and N, and wherein the steel strip on its surface exhibits a surface roughness (Ra) of 0.2 to 3 mum and the thickness (T) of the organic resin coating is in the range of 0.1 to 6 mum. The ratio of T / Ra is preferably in the range of 0.2 to 4.0. The organic resin coating contains dispersed wax particles. The ratio (Phi / T) of wax average particle diameter (Phi) to coating thickness (T) is in the range of 0.5 to 5, and the content of wax in the coating is in the range of 2 to 20% in terms of the ratio of area occupied by wax when the coating surface is observed through an electron microscope. The organic resin coating may contain one or both of (a) a total of 2 to 50 mass% of at least one coupling agent and (b) a total of 2 to 80 mass% of at least one metal oxide selected from among SiO2, Fe3O4, Fe2O3, Ni-O, Zr-O, Cr2O3 and Al2O3.

Description

technical field [0001] The present invention relates to a material for an inner magnetic shield, which is a part installed in a cathode ray tube used in a color television, a display unit, etc., and a method of manufacturing the same. Background technique [0002] The basic structure of a cathode ray tube (CRT), also known as a Braun tube, includes an electron gun and a fluorescent screen that converts the electron beam into an image, and these parts are contained in a glass tube formed by joining a panel member and a funnel-shaped member. [0003] The magnetic shielding member (only refers to the magnetic shielding below) is located on one side of the CRT that can display color images (color picture tube), which is to prevent the electron beam from being deflected by the earth's magnetic field. The magnetic shield includes an inner magnetic shield installed inside the CRT and an outer magnetic shield installed outside the CRT. [0004] Materials used for these inner and ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C30/00H01F1/37H01J29/00
CPCH01F1/37H01J29/003C23C30/00H01J29/02C23C26/00
Inventor 山中庆一阪本尚生小林健一郎松尾左千夫
Owner NITTETABU STEEL SHEET CORP
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