CN2422724Y

CN2422724Y - Improved shadow mask for colour kinescope

Info

Publication number: CN2422724Y
Application number: CN 00216685
Authority: CN
Inventors: 王群; 王达兴; 蔡全兴
Original assignee: SHANGHAI YONGXIN COLOR KINESCOPE CO Ltd
Current assignee: SHANGHAI YONGXIN COLOR KINESCOPE CO Ltd
Priority date: 2000-03-02
Filing date: 2000-03-02
Publication date: 2001-03-07
Anticipated expiration: 2010-03-02

Abstract

The utility model discloses an improved shadow mask structure for a colour kinescope. The shadow mask structure comprises a plurality of columns of grids; each column of grid is provided with a plurality of grids; the central horizontal pitch of the shadow mask is converted between 0.63 mm and 0.67 mm; the horizontal pitch of four angles is converted between 0.78 mm and 0.82 mm. Therefore, the central horizontal pitch of the grids of the shadow mask structure and the horizontal pitch of the four angles of the utility model are smaller than the original pitches, and the density of electron beams arriving at a fluorescent screen after passing through the shadow mask is increased. When the kinescope adopts the shadow mask of the utility model, the pixel points formed on the fluorescent screen is also increased favorable to enhance resolution.

Description

Improved shadow mask structure

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

Shadow mask is one of five big parts of color picture tube, and it selects look as mask structure with the three electron-beam that keeps certain minute angle.The resolution of color picture tube is decided by the luminous point performance of electron gun on the one hand, determine shade mask structure on the other hand, as, the shade mask structure of 73 centimetres of traditional color picture tubes 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, and the distance between the grid center of adjacent column is a horizontal pitch.Conventional picture tube is owing to horizontal pitch between the grid of adjacent column is too big, thereby the pixel (each pixel is made up of the red, green, blue three-color phosphor) that forms is also just few, and resolution is also just low.For a color 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 73 centimetres of for example traditional picture tubes is 0.75mm, and four jiaos horizontal pitch value is 0.90mm, can not satisfy player and the SVGA requirement to color picture tube corresponding to the such resolution of the picture tube of value.

For this reason, the purpose of this utility model is the shortcoming that exists at traditional shadow mask, proposes a kind of improved shadow mask structure.

To achieve these goals, the utility model adopts following technical scheme: the same with traditional shadow mask, 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, distance 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 0.75mm and value between 0.63mm-0.67mm; Described four angle horizontal pitchs less than 0.90mm and value between 0.78mm-0.82mm.

Because the utility model is changed into the central horizontal pitch of shadow mask between the 0.63mm-0.67mm, the horizontal pitch at four angles is changed between the 0.78mm-0.82mm, make the central horizontal pitch of grid of shade mask structure of the present utility model and four angle horizontal pitchs all less than original pitch, thereby the pixel that forms on the phosphor screen of color picture tube also increases thereupon, after picture tube uses shadow mask of the present utility model, help improving its resolution.

Below in conjunction with drawings and Examples, shade mask structure of the present utility model is done one explains:

Fig. 1 is the shadow mask structural representation.

Fig. 2 is the horizontal pitch schematic diagram of two adjacent grids of shade mask structure of the present utility model.

Fig. 3 is Fig. 1's " L-L " sectional structure schematic diagram.

Please consult Fig. 1, shown in Figure 3 earlier, 73 centimetres of traditional shadow mask structures comprise 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, distance between the grid aperture center of adjacent column is horizontal pitch PH, horizontal pitch to each grid in the adjacent column equates, that is to say that 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 PH _O, the horizontal pitch between the two adjacent column grid apertures at four angles is four jiaos of horizontal pitch PH _J, central horizontal pitch PH _OValue be 0.75mm, four jiaos of horizontal pitch PH _JBe 0.90mm (PH _O, PH _JDo not express among the figure).

Please again in conjunction with shown in Figure 2, the utility model and traditional 73 centimetres of shadow mask structures are basic identical, and difference is: described central horizontal pitch PH _OLess than 0.75mm, and value is between 0.63mm-0.67mm; Described four angle horizontal pitch PH _JLess than 0.90mm, and value is between 0.78mm-0.82mm.

Described central horizontal pitch PH _OBest value is 0.65mm.Described four angle horizontal pitch PHJ are best, and value is 0.80mm.Used shade mask structure of the present utility model in color picture tube after, according to such value, in identical significant surface, after experiment, the pixel total amount increases by 15% on the phosphor screen of picture tube, obviously helps improving the resolution of color picture tube.And then can satisfy the requirement of SVGA to high-quality screen.

Claims

1, a kind of improved shadow mask 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, distance 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 0.75mm and value between 0.63mm-0.67mm; Described four angle horizontal pitchs less than 0.90mm and value between 0.78mm-0.82mm.

2, improved shadow mask structure as claimed in claim 1, it is characterized in that: described central horizontal pitch is 0.65mm.

3, improved shadow mask structure as claimed in claim 1 is characterized in that: described four angle horizontal pitchs are 0.80mm.