CN1147686A

CN1147686A - Shadow mask frame structure

Info

Publication number: CN1147686A
Application number: CN96111797A
Authority: CN
Inventors: 郑俸权
Original assignee: Samsung Electron Devices Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 1995-07-24
Filing date: 1996-07-24
Publication date: 1997-04-16
Also published as: GB2303735A; KR970007204U; DE19629927A1; KR200147271Y1; GB9615554D0; JPH0935654A

Abstract

The invention discloses a shadow mask framework structure used in a color kinescope, which comprises a plurality of eyelets, a lateral margin shadow mask, and a plurality of corner springs for the attachment of the shadow mask on the inner side of a panel of the color kinescope. The framework has a flanging with an expansion part, wherein the points of the both sides of a centerline on a short side are disposed on the opening of the sort sides of the flanging, thus the expansion part is formed. The cutting line of the opening is parallel to the axis of the color kinescope. The thermal expansion part is provided with a low thermal expansion metal in which the coefficient of heat expansion is less than that of the framework.

Description

The frame structure of shadow mask

The present invention relates to the frame structure of shadow mask used in the color picture tube.

In general, color picture tube comprises a bulb that panel, pars infundibularis and neck are combined, an electron gun system that is installed in the neck the inside, and phosphor screen with three kinds of different fluorophor, described fluorophor is arranged in the panel inboard, in order to produce three primary colors-red (R), green (G), blue (B).In the cross facet of the electron beam that electron gun system penetrates, a metal shadow mask directly is placed in the phosphor screen back, all beat on correct fluorophor to guarantee each bundle.The effect of described shadow mask be when electron beam from a position during to the next position, as physical barriers layer, and make by the generation that excites the look that looks genuine due to the incorrect fluorophor and reduce to minimum degree each electron beam.Described shadow mask is associated in a framework, forms mask assembly, is loaded on the panel inboard.

With reference to Fig. 3, common mask assembly comprises that has a shadow mask 4 of imitating part 1, and described shadow mask 4 has the reinforcing crimping 2 of a flange of making described live part 1 and one almost perpendicular to the formed lateral margin 3 of this live part.Described mask assembly also comprises framework 6, and it has the vertical coupling part 5 and the dress that have sweep to invest each sweep in order to mask assembly is hung over the turning spring on each comer pins of being located at the panel inboard.

In this common shadow mask, have only the electron beam of 15-25% to drop on the fluoroscopic fluorophor by shadow mask 4 apertures, all the other electron beams impinge upon on the solid portion of shadow mask 4, thereby make the about 30-80 of its increase in temperature ℃.As a result, produce a kind of dome phenomenon, described shadow mask is expanded towards phosphor screen, so that electron beam is straggly on incorrect fluorophor, thereby produce so-called purity skew, the expression colorimetric purity descends.

For preventing the dome phenomenon, the Korean Patent No.92-6232 that authorized RCA Licensing Corp. on August 1st, 1992 has shown a kind of frame structure of shadow mask, and it comprises four angle parts of shadow mask and at the frame openings of end.The part of four jiaos of places of this shadow mask lateral margin and the flanging at four jiaos of places of framework are levels, and acutangulate with main shaft and auxilliary axle.Such structure does not fully solve the dome problem, can not reduce the difference of thermal expansion between shadow mask and framework, and this has just increased to reaching the required equilibration time of heat balance.

The objective of the invention is to propose a kind of device,, thereby can reach thermal compensation at short notice, improve fluoroscopic colorimetric purity in order to the response of improvement to the initial dome phenomenon due to thermal dilation difference between shadow mask in the color picture tube and framework.

According to the present invention, the shadow mask frame structure of using in a kind of color picture tube comprises the shadow mask with a plurality of eyelets and a lateral margin, also comprises a plurality of turnings spring that is used for the shadow mask dress is attached to the inboard of colorful visualization tube face plate.Described framework has the flanging of band dilation, and dilation wherein is to form by the minor face upper shed that is in this flanging at the point along the center line both sides of flanging minor face.The opening line of cut is parallel with the axis of color picture tube.The metal that thermal expansion is less installs to the thermal expansion part, and the thermal coefficient of expansion of this metal is littler than the framework.

Below only by way of example, the present invention is more specifically described with reference to accompanying drawing, wherein:

Fig. 1 is the perspective view of a kind of mask assembly of expression the present invention;

Fig. 2 is the cross section circle along A-A line among Fig. 1 is got;

Fig. 3 is the perspective view of the common mask assembly of expression;

Fig. 4 is the sectional view of being got along by the short-and-medium paracentral line of Fig. 3.

Below will describe the preferred embodiments of the present invention in detail as reference, accompanying drawing illustrates one of them example.Identical or similar part among each figure is all adopted identical reference number as far as possible.

Fig. 1 represents a shadow mask that separates with framework.Shadow mask 14 comprises a plurality of in order to the eyelet by electron beam, and they are arranged on the live part 11, and shadow mask 14 also comprises lateral margin 13, and it almost vertically is bent along the edge of live part 11.

Lateral margin 13 is adorned the inboard or the outside of the flanging 15 that is attached to framework 16, and it is welded in several suitable some places.Maximum solder joint numbers is along flanging 15 long limits three solder joints to be arranged, and at minor face place mid portion a solder joint is arranged.The lateral margin 13 of shadow mask 14 and the flanging 15 of framework 16 are parallel to the axis of color picture tube.

According to the present invention, framework 16 has thermal expansion part 18, and it is to be in the minor face upper shed by the point in the minor face center line both sides of its flanging 15 to form.The opening line of cut is parallel to described axis.The maximum length of thermal expansion part 18 is defined as 9/10ths of flanging 15 height, because the long reduction that may cause support force of length causes undue thermal expansion simultaneously.

In addition, thermal expansion part 18 is equipped with low thermal expansion metal base 19, and its thermal coefficient of expansion is littler than framework 16.As shown in Figure 2, when the lateral margin 13 of shadow mask dress being invested flanging 15 inboard, this low thermal expansion metal base 19 just is attached to the outside of thermal expansion part 18, perhaps under opposite situation, invests the inboard of thermal expansion part 18.Low thermal expansion metal base 19 can be by iron-nickel alloy, make as invar, and framework 16 is made with stainless steel.Four turnings are made the shape with plane, in order to adorn attached turning spring 17.

With reference to Fig. 2, the work effect of structure of the present invention is described below.

In the present embodiment, lateral margin 13 dresses of shadow mask 14 are attached to the inboard of the thermal expansion part 18 of framework 16.When electron beam impinges upon the solid portion of shadow mask 14, when making its thermal expansion, because the dome phenomenon, the middle body of shadow mask 14 is protruding in phosphor screen.When thermal expansion part 18 was heated, it worked to have the bimetal leaf outwardly-bent (to the right side of figure) of low thermal expansion metal base 19.Thermal expansion part 18 is isolated with the remainder of flanging 15 to a great extent, thereby shows the flexibility of more improving than prior art.

Therefore, like that, shadow mask 14 is by the compensate for heat expansion apace of the thermal expansion part 18 with low thermal expansion metal base 19 shown in Fig. 2 and 4.

Though it is above by having described the present invention in conjunction with being considered to the most practical and most preferred embodiment at present, but be appreciated that, the present invention is not limited to the disclosed embodiments, and on the contrary, the present invention should comprise various remodeling and the equivalent construction that is included within the present invention's spirit and the category.

Claims

1, the shadow mask frame structure of using in a kind of color picture tube comprises

Shadow mask with a plurality of eyelets and a lateral margin;

Support the framework of described shadow mask;

A plurality of turnings spring is used for the assembly of shadow mask and framework is adorned the inboard that is attached to the colorful visualization tube face plate;

Described framework has the flanging of band dilation, dilation wherein is to form by the minor face upper shed that the point in the center line both sides of minor face is in this flanging, the opening line of cut is parallel with the axis of color picture tube, on the described thermal expansion part low thermal expansion metal base is set, the thermal coefficient of expansion of this metal is littler than described framework.

2, a kind of shadow mask frame structure as claimed in claim 1 is characterized in that, the length of described thermal expansion part is 9/10ths of described flanging height to the maximum.

3, a kind of shadow mask frame structure as claimed in claim 1 is characterized in that, when the lateral margin of described shadow mask dress being invested described flanging inboard, described low thermal expansion metal base just dress is attached to the outside of described thermal expansion part.

4, a kind of shadow mask frame structure as claimed in claim 1 is characterized in that, when the lateral margin of described shadow mask dress was invested the outside of described flanging, described low thermal expansion metal base just dress was attached to described thermal expansion inboard partly.

5, a kind of shadow mask frame structure as claimed in claim 1 is characterized in that described low thermal expansion metal base is made by invar.