CN101202188B

CN101202188B - Edge treatment process for color kinescope used flat-plate shadow mask

Info

Publication number: CN101202188B
Application number: CN2007101141399A
Authority: CN
Inventors: 杨胜利; 唐毅晟; 王海兰; 杨松义; 位国龙; 马元骏
Original assignee: ZHENGHAI ELECTRONIC NET PLATE CO Ltd YANTAI
Current assignee: ZHENGHAI ELECTRONIC NET PLATE CO Ltd YANTAI
Priority date: 2007-11-06
Filing date: 2007-11-06
Publication date: 2010-06-23
Anticipated expiration: 2027-11-06
Also published as: CN101202188A

Abstract

The invention provides an edge treatment process of a flat shadow mask used for a color kinescope. The process is that all the light-transmitted slotted holes which neighbors the farthest line of the edge of a long line on the effective face of the shadow mask and are cut by the border lines of the long line are justified according to the ratio relationship between a transmissivity before cutting and a transmissivity after cutting, and then the slotted holes and the slotted hole positions, lengths and bridge widths of the neighboring second, third and fourth lines are rearranged on condition that the border line of the long line is not changed till each hole meets the requirement of the transmissivity ratio. An application of the flat shadow mask designed by the process of the invention to the color kinescope can preserve the smoothness of the edges of both upper and lower long sides of the color kinescope and avoid 'worm-eaten' phenomenon and 'dapple' phenomenon, simultaneously enough brightness can be preserved for the edges of both upper side and lower side of a fluorescent screen.

Description

The edge treated technology of tricolour picture tube planar mask

Technical field

The present invention relates to the colorful visualization tube apparatus, especially relate to the edge treated technology of planar mask in a kind of color picture tube.

Background technology

In general, the electron gun divergent bundle of color picture tube is got to fluoroscopic relevant position by the loophole of planar mask then and is sent light; And shadow mask can play the effect of selecting look at this moment.The significant surface of shadow mask just is meant the regional extent that its all loopholes are formed, and the angle of the electron beam when its outermost boundary line and exposure has determined the border of light-emitting zone on the phosphor screen jointly.The shadow mask that goes out according to common treatment process design after producing colored picture tube, can rough phenomenon occur on fluoroscopic long limit, and the sawtooth like shape has influenced the quality of image.

Current, the following method of general use solves the edge crenellated phenomena, promptly adopt the scheme that becomes vertical pitch, the slotted eye quantity of each row is the same, the vertical pitch of every row is drawn by the quantity of border, long limit divided by the shadow mask sky, the result who causes like this is exactly alternately to occur whole hole and half hole on the border of odd column and even column; Average treatment is done in the whole hole of the same column that all half holes are adjacent then, allows both flute length equate.By this treatment process, so that the long limit edge preserving smoothing of significant surface.But should side's technology have certain defective, it can reduce because of the vertical pitch on long limit, both sides, and reduces the brightness on phosphor screen both sides, even can cause bright, the dark difference of maying be seen indistinctly near the bight, promptly so-called " speckle " phenomenon; The shadow mask of this traitorous distance is after on the colored picture tube that uses in addition, can because of electron beam scanning at interval and the interference phenomenon between the vertical pitch of slotted eye, on phosphor screen, form the vertical fluctuation pattern.

Just in order to solve these above problems, and treatment process of the present invention is proposed.

Summary of the invention

The objective of the invention is by the long limit of a kind of shadow mask edge treated technology is provided, can be so that the effective face length limit edge preserving smoothing on the luminescent screen for colour display tube have also guaranteed enough transmitances simultaneously.In order to achieve the above object, the present invention adopts following technical scheme.

The planar mask of color CRT, its central area is the significant surface zone, comprise hole part and imporous land part in this zone, hole partly is to have a series of loopholes that are provided at predetermined intervals, the hole is along the linear array that is parallel to significant surface zone minor face, crane span structure connects the hole that links to each other, the land part of atresia is the strip part that is parallel to the long limit of part with holes, between described two row part with holes, wherein, for each row in the part with holes, following processing is carried out in several row hole of the boundary member on long limit, significant surface zone.

The flute length of a described slotted eye of definition is that L, groove width are W, and the crane span structure width of a described slotted eye is B, and the horizontal pitch of this slotted eye is PH, normal pitch PV=L+B, transmitance

The distance of the inboard minor face in definition first hole of border to these row from the border is Lv, imaginary transmitance

If Tr '＜0.75Tr, then this hole of row outermost row and adjacent hole merging, dividing equally is two slotted eyes, if fruit is adjusted the Tr '＜0.75Tr of back slotted eye this moment, then with this hole of row outermost row and two adjacent slotted eyes merging, dividing equally is three slotted eyes, by that analogy, reaches till Tr ' 〉=0.75Tr;

If 0.75Tr≤Tr '≤Tr, then slotted eye of this row outermost does not change;

If Tr＜Tr '≤1.05Tr then merges two slotted eyes of this row outermost, dividing equally is two slotted eyes;

If Tr '＞1.05Tr then by adjusting the length of two adjacent flute length of these row outermost row and crane span structure, makes Tr '=1.05Tr.

Description of drawings

Fig. 1 is the local enlarged diagram of planar mask significant surface edge treated;

Fig. 2 is the local transmitance estimation of a planar mask schematic diagram;

Fig. 3 is that prior art is handled the long limit of planar mask BORDER PROCESSING process schematic representation;

Fig. 4 has provided the schematic diagram of the long limit of planar mask of the present invention BORDER PROCESSING technology.

Embodiment

Further specify technical scheme of the present invention below in conjunction with embodiment and accompanying drawing.

Main improvement of the present invention is handled the border on the effective face length of this planar mask limit with regard to being, as shown in Figure 2, the hole length of a slotted eye of definition is L, the width of a crane span structure is B, normal pitch PV=L+B, horizontal pitch is PH, and effectively border, face length limit is Lv to the distance of the inboard minor face of a slotted eye of this row outermost.

Actual conditions definition according to actual shadow mask production technology is Tr from the transmitance of growing second slotted eye in border, limit, and Tr is approximate to adopt following formula to estimate

Definition is Tr ' from the transmitance of first slotted eye inboard, border, long limit, and Tr ' is approximate to adopt following formula to estimate

Handle respectively with the different of proportionate relationship between the Tr ' according to Tr:

If Tr '＜0.75Tr, then hole S4-1 of these row outermost row and adjacent hole S4-2 merging, divide equally is two slotted eye S ' 4-1 and S ' 4-2, if fruit is adjusted the Tr '＜0.75Tr of back slotted eye this moment, then with hole S2-1 of these row outermost row and two adjacent slotted eye S2-2, S2-3 merges, and dividing equally is three slotted eye S ' 2-1, S ' 2-2 and S ' 2-3, by that analogy, reach till Tr ' 〉=0.75Tr;

If 0.75Tr≤Tr '≤Tr, then slotted eye S1-1 of this row outermost does not change, and promptly S ' 1-1 is identical with S1-1;

If Tr＜Tr '≤1.05Tr then merges two slotted eye S3-1 of this row outermost and S3-2, dividing equally is two slotted eye S ' 3-1 and S ' 3-2;

If Tr '＞1.05Tr, then by adjust S5-1, S5-2, B5-1, B5-2 are adjusted to S ' 5-1, S ' 5-2, B ' 5-1, B ' 5-2, make Tr '=1.05Tr.

Above example adopts above-mentioned treatment process design under L=500, B=150, W=180, PH=900, PV=650 condition, can make shadow mask significant surface edge preserving smoothing.

The color picture tube planar mask of employing technical solution of the present invention can be so that the long limit of significant surface edge preserving smoothing, guarantee that simultaneously transmitance between adjacent two row of slotted eye in special processing is between 75%～105%, kept higher transmittance, avoided in shadow mask edge appearance " speckle " phenomenon.

Claims

1. the edge treated technology of tricolour picture tube planar mask, the planar mask central area is the significant surface zone, comprise hole part and imporous land part in this zone, wherein, for each row in the part with holes, the method that the several rows of the boundary member on long limit, significant surface zone are judged in following transmitance ratio is handled:

The flute length that this method at first defines a described slotted eye is that L, groove width are W, and the crane span structure width of a described slotted eye is B, and the horizontal pitch of this slotted eye is PH, normal pitch PV=L+B, transmitance

If Tr＜0.75Tr, then outermost two adjacent slotted eyes on the same end of same row are merged, dividing equally is two slotted eyes, if adjust the Tr＜0.75Tr of back slotted eye this moment, then outermost three adjacent slotted eyes on the same end of same row are merged, dividing equally is three slotted eyes, by that analogy, reaches till Tr 〉=0.75Tr;

If 0.75Tr≤Tr '≤Tr does not then change outermost slotted eye on the same end of same row;

If Tr＜Tr '≤1.05Tr then merges outermost two adjacent slotted eyes on the same end of same row, dividing equally is two slotted eyes;

If Tr＞1.05Tr, then length by adjusting outermost two adjacent slotted eyes on the same end of same row and adjacent crane span structure width thereof make Tr '=1.05Tr.

2. shadow mask significant surface edge treated technology according to claim 1 is characterized in that, handles effective face length limit according to the transmitance ratio, no more than 4 of the slotted eye that each row is handled.

3. shadow mask significant surface edge treated technology according to claim 1 is characterized in that described crane span structure width B is 0.08～0.3mm, and described groove width W is 0.10～0.25mm; Described normal pitch PV is 0.50～0.85mm.