JPS58175237A - Color picture tube - Google Patents

Abstract

PURPOSE:To better plasticity of a mask and improve mechanical strength while dispersing tensile load due to draw processing when molding the mask on bridge parts and groove-like parts by forming the groove-like parts on bank parts on the screen side of the shadow mask or crossing the bank parts. CONSTITUTION:Groove-like parts 13 are scattered or arranged in rows on the screen side of bank parts 12 while said groove-like parts 13 are formed so as to be lying on said bank parts or crossing the bank parts 12 to unite rows of said strip-like hole parts partitioned by the bank parts each other. In a shadow mask 11 of such constitution, the tensile load due to draw processing when molding the mask, which has been hitherto concentrated on bridge parts 4, is dispersed on the bridge parts 4 and the groove-like parts 13 by said groove-like parts thus to reduce a difference between the tensile loads in the X-axis direction and the Y-axis direction, while simplifying processing of mask molding and reducing the elongation of the stripe-like hole parts 3 when molding and further eliminating any bridge break even in the case of small width of the bridge.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a shadow mask type color picture tube, and more particularly to a shadow mask having striped aperture groups.

TECHNICAL IR CHAPTER OF THE INVENTION In general, each shadow mask type color picture tube has a rim, a screw gun means for generating a blue-emitting phosphor screen, and each electron beam is directed only onto the corresponding phosphor. It has a 7-point phosphor screen placed close to the screen between the electron guns.The slit mask is often used as a slit mask, which has striped holes as a large number of fine holes through which the electron beam passes. ing.

Various proposals have been made regarding slit-shaped osks, but generally a color-selecting board is made of striped holes divided into a plurality of holes by bridges provided at appropriate intervals in the stripe direction. In this case, the striped holes are partitioned by the bridges, and the direction perpendicular to the stripes is partitioned by punctures. Namely the 11th! glK: The IIK shadow mask (1) shown is generally made of a steel plate with a thickness of 0.15 to 11 degrees, with a horizontal pitch of 0.6 m1 perpendicular to the stripes, KO on the screen side, and striped holes with 3 mm wide openings ( 3
), when the puncture part (2) is formed with a width of 0.3 mm, the width of the striped opening on the electron gun side is 0.14 mm, and if the pitch in the stripe direction is approximately 1 ml1, then the width of the striped hole on the electron gun side is 0.14 mm. Bridge portion (4) 0@ becomes 0.05■.

However, in reality, when such a shadow mask is molded into the shape of a sphere, the tension of the bridge part m
Since the ll is very weak compared to the bank part, there is a drawback that the bridge is broken during molding. Also, to prevent the bridge from breaking (it is necessary to increase the bridge width to 0.2 to 0.3 m or thicken the plate thickness.However, if the bridge width is increased, striped fluorescent material t
- When forming, it may cause shadows during exposure, moiré during operation, decrease in electron beam transmission rate, etc. #I or increasing the plate thickness has the disadvantage that the tri-electron beam's Halesh II7 deteriorates, and in any case, it is difficult to implement it.

Purpose of the Invention The present invention has been devised to address the current situation by creating a mask molding I: a strong shadow i-sk 1! - To provide a shadow mask with low screen formation and beam halation.

Summary of the Invention The present invention improves mask formability by forming a groove-like part that crosses the puncture E or bank part on the screen side of a shadow mask, and distributing the tensile load caused by the drawing process during mask molding to the pulled part and the groove-like part. The purpose is to improve mechanical strength.

Embodiment of the Invention FIG. 2 shows a giIR perspective view of a shadow mask applied to a 1m color receiver according to the present invention. A striped group row having a large number of striped holes 5 (3) is formed between the bank portions a having the same plate thickness t as that of the mask aυ. A large number of striped holes (3) # are arranged at appropriate intervals in the direction of the stripe to form the leather bridge II (
41.

It goes without saying that the bridges 5 (4) may be arranged in a staggered manner for each of the nine stripe rows shown in Figure s2, or may be arranged in a different arrangement. In this puncture, the screen @ of gQ3 is dotted with grooves 1@103 or arranged in an array, and this groove-shaped SaW has the bank portion hK or the grooves 1@103 are aligned.
The rows of striped holes, which are partitioned by the bank portions, are formed so as to traverse the bank portion a2 and lag behind each other. Here, it is preferable that the arrangement position of the puncture ma'a side of the groove-like part a field is at the same position as the bridge in the Y-axis direction, that is, so as to sandwich the bridge, but it may not necessarily be the same depending on the purpose of use. Must have! There isn't.

Effects of the Invention In a shadow mask having such a structure, the mask strength is increased. Or, even if the thickness and width of the bank part are large when the pitch in the X-axis direction is increased, even if the thickness and width of the bridge part are changed, the shape or arrangement position of the front groove part Go around! ! By placing it in &, the tensile load caused by the drawing process during mask molding can be bridged conventionally! The IlK concentration is dispersed in the bridge part and sieve-like srC by the groove-like part, and the difference in tensile load in the X-axis direction and the Y-axis direction becomes smaller, making mask molding easier, and when forming striped holes. It is possible to reduce the elongation and eliminate bridge breakage even when the bridge width is small.

At the casting position of the 9th J-shaped part, a puncture St is placed at the 1111 part in the Y-axis direction of the Nariko beam shape corresponding to the shape of the striped hole in each part of the screen or at the position in the Y-axis direction of the bank part with respect to the corner part. - By arranging the electron beams horizontally, the shape of the electron beam is not vignetted, and the shape of the electron beam can also be suppressed.

[Brief explanation of the drawing]

111111G is a schematic perspective view of the shadow mask used in the conventional color receiver 1#, and the younger 2nd figure is a partial schematic perspective view 4 showing the Kuyadu mask applied to the color receiver tube κ of the present invention. (3)...Striped hole (4)...Bridge part αF...Shadow mask Function...Bank part a-Ken...
bound part

Claims (1)

[Scope of Claims] (11) In a 7-ray mask type picture tube having a shadow mask consisting of a large number of striped aperture groups disposed close to a phosphor screen, the shadow mask includes a large number of striped holes. The striped holes are arranged in a row, and the striped holes are divided by a bridge part in the stripe direction, and divided by a bar part in a direction at an angle to the stripe direction, A color picture tube in which the side 9 of the screen 1 of the paring section is formed by attaching and forming a bow-shaped part that crosses the bar/rib or the bank part. Vh is formed only in the effective direction where the striped holes are formed, and M is formed in the effective direction or in a part of the non-effective part other than the effective surface, or in a certain section. The color picture tube according to claim 1, paragraph 6, is defined as tP!IIF, which is the t-W value. 3. A color picture tube according to claim 1 or 2, characterized in that IIK is formed which gradually changes in the circumferential direction of the mask.