CN2343674Y - High-fine plane shadow mask for multimedia colour-television tube - Google Patents

Abstract

The utility model discloses a plane shadow mask capable of improving resolution rate for a multimedia color-television tube, which comprises a plane shadow mask used for a cathode ray tube, wherein, the plane shadow mask is distributed with through holes of which the horizontal spacing and the vertical spacing are changed according to a certain rule (the rule can be represented as a multinomial of the distance to a Y axis or an X axis, and the multinomial in both directions can be different), and the shape of each of the holes can form a linear shape, a circular shape or other shapes. A television made by the utility model can be used under multi-system, and the moire fringe can not be fundamentally seen. The utility model is suitable for multimedia televisions, can display television images, and can also display VGA signals. When the shadow mask is formed, a new mould does not need making.

Description

The high meticulous planar mask that the multimedia television colored picture tube is used

The utility model belongs to the operation technique field, further relates to a kind of high meticulous planar mask, and it is used for chromoscope or colour display tube through after the punch forming, plays a part to improve significantly image definition.

Shadow mask is important composition parts of chromoscope or colour display tube.Common step is the needs according to different purposes, the design planar mask, hundreds of thousands and even regularly arranged strip up to a million or point-like through hole are arranged on it, it generally is the making of finishing these through holes with the method for chemical etching, be certain curve form with diel with the planar mask punch forming then, be welded on the shadow mask frame, again to its anneal, melanism handles, be installed on the screen then.On display screen, utilize shadow mask to be coated with the fluorescent material of three kinds of colors of red, green, blue successively.Its method is through seeing through steps such as shadow mask exposure, development, oven dry, form the phosphor strip or the fluorescent material point of three kinds of colors of red, green, blue according to certain position, arrangement and spacing on the phosphor screen inner surface.When chromoscope or colour display tube work, three electron guns (respectively in different positions) are launched electron beam, with the through hole of different angles by shadow mask, get on the corresponding fluorescent material, make light-emitting phosphor, just can displayed image or character, the amount of information of shown image or character, the pitch and the size of through hole, the focusing quality of electron gun and the factors such as convergence quality of deflecting coil that depend on shadow mask, wherein shadow mask plays an important role, whether in addition, have Moire fringe to occur in the displayed image, all the design with shadow mask has direct relation.The common practice is pitch, hole size and the regularity of distribution thereof according to the requirement design shadow mask of pipe, obtains the curve form of shadow mask, makes diel again; Direction of general employing is to switch political loyalty apart from (horizontal direction), in pitches such as vertical direction are.

The purpose of this utility model is to provide a kind of planar mask, utilize original diel to come moulding, not only be applicable to the PAL television system but also be applicable to the ntsc television standard, the meticulous planar mask of this height is applicable to multimedia television---both TV image can be shown, the VGA signal of computer output can be more clearly shown again.

The utility model is a planar mask that is used for cathode ray tube (chromoscope or colour display tube), level distribution spacing, vertical interval (can be expressed as the multinomial of Y-axis or X-axis distance according to certain rules on it, the multinomial of both direction can be different) through hole that changes, the shape in hole can be bar shaped, circular or other shape.The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1 is overall structure figure of the present utility model.

Fig. 2 is 6 a local enlarged diagram among the embodiment 1

Fig. 3 is the central cross-section figure of 1 one shadow mask hole along continuous straight runs of embodiment.

Fig. 4 is 6 a local enlarged diagram among the embodiment 2

Fig. 5 is that shadow mask slotted eye row center line X coordinate and pitch concern schematic diagram

Referring to Fig. 1,3, the utility model adopts a kind of two switching political loyalty apart from shadow mask, the top of shadow mask is plane 1 (Fig. 3), and the following of shadow mask is plane 2 (Fig. 3), and the surface of shadow mask is made up of two parts: the part 3 (Fig. 1) of internal corrosion through hole, peripheral corrosion half deep hole partly reach and do not corrode part.On two sides on 31,2, corrode macropore 4, aperture 5 (Fig. 3) respectively, and from the center to both sides, the off(-)center in large and small hole 4,5 increases gradually, the hole be distributed in up and down symmetry, left-right symmetric.From the electron beam rule that deflection is assembled the electromagnetic field of chromoscope, if keep under the constant situation of deflection plane, electron beam spacing and screen curved surface and aperture mask curved surface, it is as follows that research can be obtained the conversion relation that improves between the shadow mask resolution back shadow mask pitch by analysis:

P _HO'=P _HOq ₀'/q ₀(1) wherein

P _HO' for improving the centromere distance of resolution back shadow mask

q ₀' for improving the distance of resolution back shadow mask center from the screen center

P _HOThe centromere distance of former shadow mask

q ₀Former shadow mask center from the pitch of distance any point on X-axis at screen center is

P _H'=P _H-3S (q ₀-q ₀')/(L ₀-Z _S) (2) wherein

P _H' for improving the pitch of resolution back shadow mask any point on X-axis

P _HThe pitch of former shadow mask any point on X-axis

L ₀Deflection plane is from the distance at screen center

The distance of S deflection plane top Shu Yuzhong bundle

Z _SArbitrary horizontal pitch P that waits to ask on the arbitrary line Y=y that the pitch place can extrapolate to be parallel to X-axis by above-mentioned (1), (2) two fundamental relation formulas to the vertical height of shadow mask central point on the X-axis _H(x), this pitch increases from the Y-axis to the right and left gradually, an available polynomial repressentation, this multinomial is increasing function, independent variable be to Y-axis apart from x:P _H(x)=A ₀(y)+A ₂(y) x ²+ A ₄(y) x ⁴+ A ₆(y) X ⁶+ ... A wherein ₀(y), A ₂(y), A ₄(y), A ₆(y) ... be the function of y, for example in the horizontal direction, pitch P _H(x) from 0.48～0.65 millimeter 0.63～0.81 millimeter of increasing to the right and left gradually at center.Be parallel on the arbitrary line X=x of Y-axis the normal pitch P in hole _v(y) increase gradually to both sides up and down from X-axis, an available polynomial repressentation, this multinomial is an increasing function, independent variable is the distance y to X-axis: P _v(y)=B ₀(x)+B ₂(x) y ²+ B ₄(x) y ⁴+ B ₆(x) y ⁶+ ... B wherein ₀(x), B ₂(X), B ₄(x), B ₆(x) ... be the function of x, for example, pitch P _v(y) increase to 0.75 millimeter of both sides up and down gradually from 0.47 millimeter of X-axis.

As shown in Figure 2, through hole can be bar shaped, P among the figure _HBe horizontal pitch, P _vIt is normal pitch.

As shown in Figure 4, through hole also can be circular.

For strip screen shadow mask, the relation of N row slotted eye and X coordinate as shown in Figure 5, N represents that strip shields the columns of shadow mask slotted eye, X _NBe the X coordinate of N row slotted eye, for example X ₁=P _1,0, X ₂=P _1,0+ P _2,0, X ₃=P _1,0+ P _2,0+ P _3,0, X _N=P _1,0+ P _2,0+ P _3,0+ ... + P _{N, 0}, $P_{H,N,y}=A_0\left(y\right)+A_2\left(y\right){\left(\underset{k=1}{\overset{N}{\mathrm{\Σ}}}{P}_{k-1,y}\right)}^2$ Therefore the also available following formulate of shadow mask pitch formula: perhaps P _H(N, y)=A ₀(y) [1+A ₂(y) (N-1) ²+ A ₄(y) (N-1) ⁴+ A ₆(y) (N-1) ⁶+ ... ]

In addition, among Fig. 1, X, Y are respectively level, vertical coordinate axle.Among Fig. 3, D is the width of aperture 5, and D ' is the width of macropore 4.

Example 1 is an example with 25 inches colored picture tubes, and on X-axis, flat pitch P can fetch water _H(x)=0.60+2.8016736 * 10 ^-6x ²On Y=168.62, flat pitch P can fetch water _H(x)=0.583+4.1685665 * 10 ^-6x ²Normal pitch P _v(y)=0.57+3.31055 * 10 ^-7y ², at this moment horizontal resolution can reach 700 lines.

Example 2, to 25 inches colored picture tubes, when adopting invar sheet material, pitch can be littler, and is as follows: on X-axis, horizontal pitch P _H(x)=0.50+1.103019 * 10 ^-6x ²+ 2.170557 * 10 ^-11x ⁴On Y=168.62, horizontal pitch P _H(x)=0.485+3.446825 * 10 ^-6x ²Normal pitch P _v(x)=0.57+3.31055 * 10 ^-7y ², at this moment, then horizontal resolution can reach more than 800 lines.

Example 3 is an example with 21 inches colored picture tubes, is taken on the X-axis horizontal pitch P _H(x)=0.49+3.5484 * 10 ^-6x ²On Y=145.0, horizontal pitch P _H(x)=0.47+5.758 * 10 ^-6x ²Normal pitch P _v(y)=0.477+1.9025 * 10 ^-7y ², at this moment, horizontal resolution can reach more than 700 lines.

By the foregoing description as can be known, the utility model most preferred embodiment in the horizontal direction, pitch P _H(x) from 0.47～0.65 millimeter 0.63～0.81 millimeter of increasing to the right and left gradually at center, in vertical direction, pitch P _v(y) increase to 0.75 millimeter of both sides up and down gradually from 0.47 millimeter of X-axis.

Television receiver with the utility model makes both can use under pal mode, also can use under the TSC-system formula, and Moire fringe be can't see substantially; And be applicable to multimedia television, both can show TV image, also can show the VGA signal of computer output.Simultaneously, design of the present utility model has not only improved resolution, when producing in batches, can maximally utilise original mould and other production equipment, has shortened the development time, has reduced production cost.

Claims (5)

1. the planar mask used of multimedia television colored picture tube, comprise a planar mask that is used for cathode ray tube, the top of shadow mask is plane 1, and the following of shadow mask is plane 2, it is characterized in that the through hole that level distribution spacing and vertical spacing change by the multinomial that is expressed as Y-axis or X-axis distance on it.

2. planar mask according to claim 1, it is characterized in that, the surface of shadow mask is partly reached by the part 3 of internal corrosion through hole, peripheral corrosion half deep hole does not corrode part and forms, the two sides is corroded macropore 4, aperture 5 respectively on 3, and from the center to both sides, the off(-)center in large and small hole increases gradually, being distributed in of hole is symmetrical up and down, left-right symmetric is being parallel on the arbitrary line Y=y of X-axis the horizontal pitch P in hole _H(x) from the Y-axis to the right and left, increase gradually, an available polynomial repressentation, this multinomial is increasing function, independent variable be to Y-axis apart from x:P _H(x)=A ₀(y)+A ₂(y) x ²+ A ₄(y) x ⁴+ A ₆(y) x ⁶+ ... A wherein ₀(y), A ₂(y), A ₄(y), A ₆(y) ... be the function of y, be parallel on the arbitrary line X=x of Y-axis the normal pitch P in hole _v(y) increase gradually to both sides up and down from X-axis, an available polynomial repressentation, this multinomial is an increasing function, independent variable is the distance y to X-axis: P _v(y)=B ₀(x)+B ₂(x) y ²+ B ₄(x) y ⁴+ B ₆(x) y ⁶+ ... B wherein ₀(x), B ₂(x), B ₄(x), B ₆(x) ... function for x.

3. planar mask according to claim 1 and 2 is characterized in that, for strip screen shadow mask, is being parallel on the arbitrary line Y=y of X-axis, and horizontal pitch can be used following formulate:

P _{H, N, y}=A ₀(y)+A ₂(y) (X _N-1) ²Wherein N is the columns of slotted eye, X _N-1It is the X coordinate of N-1 row slotted eye.

4. according to claim 1 or 3 described planar masks, it is characterized in that, for strip screen shadow mask, in the horizontal direction, pitch P _H(x) from 0.47～0.65 millimeter 0.63～0.81 millimeter of increasing to the right and left gradually at center, in vertical direction, pitch P _v(y) increase to 0.75 millimeter of both sides up and down gradually from 0.47 millimeter of X-axis.

5. planar mask according to claim 1 and 2 is characterized in that, for strip screen shadow mask, horizontal pitch can be used following formulate: P _H(N, y)=A ₀(y) [1+A ₂(y) (N-1) ²+ A ₄(y) (N-1) ⁴+ A ₆(y) (N-1) ⁶+ ... ] wherein N be the columns of slotted eye.

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