CN2545699Y - Improved shadow mask structure of color kinescope - Google Patents

Abstract

The utility model discloses an improved color kinescope shadow mask structure. The shadow mask structure comprises a plurality of grid rows. Each grid row is provided with a plurality of grids. Each grid is provided with a big hole on the top end and a small hole at the lower end. The horizontal distance between the hole-centers of adjacent grids is horizontal pitch. The horizontal pitch between the two adjacent rows of grid-holes in the center of the shadow mask is center horizontal pitch. The horizontal pitch between the two adjacent rows of grid-holes at four corners is four-corner horizontal pitch. The difference is that the center horizontal pitch is less than 0.699mm and is valued between 0.550mm and 0.590mm while the four-corner horizontal pitch is less than 0.84mm and is valued between 0.770mm and 0.810mm. So pixel points formed on a color kinescope screen is correspondingly increased. When the kinescope uses the structure of the shadow mask, the resolution is easy to be improved.

Description

Improved shadow mask in colour picture tube structure

Technical field

The utility model includes the cathode ray tube that image shows, more specifically is meant a kind of structure of improved shadow mask in colour picture tube.

Background technology

Shadow mask is one of five big parts of chromoscope, and it selects look as mask structure to the three electron-beam that keeps certain minute angle.The resolution of chromoscope depends on the luminous point performance of electron gun on the one hand, depend on shade mask structure on the other hand, the shade mask structure of traditional chromoscope independently can be made of by the grid of electron beam a plurality of, whole shadow mask grid can be divided into some row grids, each row grid all has the grid of several same structures, distance between the grid center of adjacent column is a horizontal pitch, the tradition picture tube is owing to horizontal pitch between the adjacent grid is too big, electron beam is just little by arriving fluoroscopic density behind the grid, thereby the pixel that forms is also just few, resolution is also just low, for a shadow mask in colour picture tube, horizontal pitch from the center to four jiaos is to become big according to certain rules gradually, the value of the horizontal pitch of the horizontal pitch at center and four jiaos has determined the value of other horizontal pitch of picture tube, has also determined the resolution of picture tube simultaneously.The central horizontal pitch value of 32 inches for example traditional (812.8mm) chromoscopes is 0.699mm, and four jiaos horizontal pitch value is 0.84mm, can not satisfy the requirement of high definition TV corresponding to the such resolution of the picture tube of value.

Summary of the invention

Problem at above-mentioned traditional picture tube shadow mask exists proposes a kind of improved shadow mask in colour picture tube structure.

In order to address the above problem, the utility model adopts following technical scheme: the same with traditional shadow mask in colour picture tube, this shade mask structure comprises the ordered series of numbers grid, each row grid all has several grids, the upper end of each grid is a macropore, the lower end is an aperture, horizontal range between the grid aperture center of adjacent column is a horizontal pitch, horizontal pitch between the two adjacent column grid apertures of shadow mask center is the central horizontal pitch, horizontal pitch between the two adjacent column grid apertures at four angles is four jiaos of horizontal pitchs, it is characterized in that: described central horizontal pitch less than 0.699mm and value between 0.550mm-0.590mm, described four jiaos of horizontal pitchs less than 0.84mm and value between 0.770mm-0.810mm.

Because the utility model has been done improvement to the shade mask structure of color picture tube, the central horizontal pitch of shadow mask in colour picture tube is changed into value between 0.550mm-0.590mm, and the horizontal pitch at four angles changed into value between 0.770mm-0.810mm, make the horizontal pitch at the central horizontal pitch of shadow mask of the utility model picture tube and four angles all less than original pitch, thereby the pixel that forms on the phosphor screen of chromoscope also increases thereupon, use the shadow mask of this structure when picture tube after, help improving its resolution.

Description of drawings

Fig. 1 is chromoscope and shade mask structure schematic diagram.

Fig. 2 is the horizontal pitch enlarged diagram of two adjacent grids of shade mask structure of the present invention.

Fig. 3 for " L-L " of Fig. 2 to analysing and observe enlarged diagram.

Embodiment

Consult Fig. 1-shown in Figure 3 earlier, traditional shadow mask in colour picture tube structure comprises ordered series of numbers grid n1, n2 ... each row grid all has several grids, the upper end of each grid is macropore D, the lower end is aperture d, horizontal range between the grid aperture center of adjacent column is horizontal pitch PH, the horizontal pitch of each grid in the corresponding adjacent column equates, that is to say, for row, the aperture centerline of each grid is on same straight line, horizontal pitch between the two adjacent column grid apertures of shadow mask center is central horizontal pitch PH0, and the horizontal pitch between the two adjacent column grid apertures at four angles is four jiaos of horizontal pitch PH1 (horizontal pitch PH0 and four jiaos of horizontal pitch PH1 do not show in the drawings).In 32 inches traditional shadow mask in colour picture tube structures, the value of central horizontal pitch PH0 is 0.699mm, and four jiaos of horizontal pitch PH1 values are 0.84mm.

Again in conjunction with shown in Figure 2, the utility model and traditional 32 inches shadow mask in colour picture tube structures are basic identical, difference is, the central horizontal pitch PH0 of 32 inches shadow mask in colour picture tube is designed to less than 0.699mm and value between 0.550mm-0.590mm, and best value is 0.57mm.Four jiaos of horizontal pitch PH1 are designed to less than 0.84mm and between 0.770mm-0.810mm, and best value is 0.79mm.After in 32 inches chromoscopes, having used shade mask structure of the present invention, according to such value, in identical significant surface, after experiment, the pixel total amount increases by 20% on the phosphor screen of picture tube, obviously help improving the resolution of chromoscope, and then can satisfy high definition TV and SVGA requirement high-quality screen.

Claims (3)

1, a kind of improved shadow mask in colour picture tube structure, this shade mask structure comprises the ordered series of numbers grid, each row grid all has several grids, the upper end of each grid is a macropore, the lower end is an aperture, horizontal range between the grid aperture center of adjacent column is a horizontal pitch, horizontal pitch between the two adjacent column grid apertures of shadow mask center is the central horizontal pitch, horizontal pitch between the two adjacent column grid apertures at four angles is four jiaos of horizontal pitchs, it is characterized in that: described central horizontal pitch less than 0.699mm and value between 0.550mm-0.590mm, described four jiaos of horizontal pitchs less than 0.84mm and value between 0.770mm-0.810mm.

2, improved shadow mask in colour picture tube structure as claimed in claim 1, it is characterized in that: described central horizontal pitch is 0.57mm.

3, improved shadow mask in colour picture tube structure as claimed in claim 1 is characterized in that: described four angle horizontal pitchs are 0.79mm.

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