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Shadow mask board

A shadow mask, ridge technology, applied in the field of anti-vibration or impact-resistant shadow mask, can solve problems such as changes

Inactive Publication Date: 2002-07-17
DAI NIPPON PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the variation of the metal material itself plays an important role in the correlation between the material quality and spring characteristics of related parts, such as the frame for supporting the shadow mask, it is troublesome that the related parts Materials vary considerably

Method used

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Examples

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example 1

[0042] Invar material (iron-nickel alloy) with a thickness of 0.13mm is used. After removing the oil stains on both sides of the sheet with a 1% sodium hydroxide aqueous solution, a photoresist material containing an ammonium dichromate casein aqueous solution was coated on both surfaces to a thickness of 7 μm, and dried. A glass pattern for exposure including a front-side aperture of 107 μm, a rear-side aperture of 72.5 μm, and a through-hole pitch of 0.23 mm was brought into close contact therewith, and exposed under ultraviolet rays. This was developed with water at 30°C and then heated to 200°C.

[0043] Pierce the through hole with a two-stage etching process. The first etching step is performed to half-etch both surfaces of the sheet. The first etching step is completed by spraying a 47 Baume ferric chloride solution at 74° C. under a prescribed spray pressure (0.54 MPa for the front side hole portion and 0.25 MPa for the rear side hole portion). Then, the half-etched hole o...

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PUM

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Abstract

A shadow mask is provided to have a strength enhanced relative to an impact, such as vibration and fall, so that the quality of a color cathode-ray tube can be kept constantly. The shadow mask is made by arranging through holes(2a), comprising rear-side holes(4a), respectively, on the electron-beam incoming side, and front-side holes(3a), respectively, on the electron-beam outgoing side, and used to form beam spots of a prescribed shape on an irradiated surface. The through hole(2a) has ridgeline parts(8) formed where tapered surfaces(10) of the hole(4a) intersect tapered surfaces(6) of the hole(3a). The dimension of the taper, expressed by a half value of the difference between the hole width(S) at ends(7) of the hole(3a) and the hole width(Q) at the ridgeline parts(8), is caused to be 30% to 40% of the plate thickness of the shadow mask. The ridgeline parts are each formed so as to have a cross-section height(k) of 35 [mu]m or less from end parts(9) of the hole(4a).

Description

Technical field [0001] The present invention relates to a shadow mask used in a cathode ray tube and the like, and more particularly to a shadow mask having improved vibration resistance or impact resistance. Background technique [0002] An example of a shadow mask 51 having a general structure is shown in a cross-sectional view Figure 5 in. See Figure 5 The shadow mask 51 is mounted on a cathode ray tube and is used to form a circular beam spot on the phosphor surface of the cathode ray tube, that is, the screen. Such a shadow mask 51 is formed with through holes 52a and 52b distributed in a predetermined pattern, and each through hole has a predetermined shape. The through holes 52a and 52b are formed by etching a thin metal sheet. Figure 5 Among them, the through hole 52a represents the cross-sectional shape at the central portion of the shadow mask, and the through hole 52b represents the cross-sectional shape at the peripheral portion of the sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J29/07
CPCH01J29/07H01J2229/0755
Inventor 小松隆泰秀岛启文牧田明松元丰荻尾卓也
Owner DAI NIPPON PRINTING CO LTD