CN201204189Y - Shadow mask of thin type CRT - Google Patents

Abstract

The utility model discloses a shadow mask of thin type cathode ray tube. Series of grilles are distributed on the shadow mask, the horizontal space between the center of the shadow mask to the edge grille are different, the horizontal pitch from the grille center line to the adjacent line is 0.70-0.75mm, the horizontal pitch from the edge line to the adjacent line is 1.05-1.30mm, the horizontal pitch between each line gradually increases from center to both edges; the aperture of the center grille is 0.175mm-0.195mm, the aperture of the grille gradually increases from center to the four corners. The curved surface distribution of the shadow mask is a multiple power distribution, the curved surface height from the center to the edge is in nonlinear variation, the curved surface height of the rim angle is15mm-35mm by taking the center of the shadow mask curved surface as a reference point. The shadow mask in this structure and curved surface distribution guarantees the assortment requirement and color selection requirements of the electron beam on the fluorescent screen, has enough mechanical intensity, and satisfies the colour purity requirement, brightness uniformity requirements, white field uniformity requirements and the like.

Description

A kind of shadow mask that is used for thin cathode ray tube

Technical field

The utility model relates to a kind of pure flat ultrathin cathode-ray formula color picture tube of 74cm that color television picture shows, particularly a kind of shadow mask that is used for thin cathode ray tube of being applied to.

Background technology

Shadow mask is one of critical component of color picture tube, plays the exposure template in the manufacture process of color picture tube, works to select look in the color picture tube course of work.In super slight type color picture tube, deflection angle adopts traditional mask design technology much larger than traditional situation, and its pitch distributes and curved-surface structure can not satisfy requirements such as colorimetric purity requirement, brightness uniformity requirement and unit white field homogeneity; Traditional in addition mask design technology is difficult to satisfy the requirement of mechanical strength; Particularly adopt traditional mask design technology can't make picture tube under the constant situation of display area, thickness is thinner, volume is littler, display quality is higher, thereby can't reduce the occupied space of picture tube.Above reason is not only bad for the advantage of performance cathode ray tube, and is unfavorable for and Display Techniques such as liquid crystal, plasma are at war with.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned prior art deficiency, a kind of shadow mask that is used for thin cathode ray tube is provided, adopt this shadow mask can reduce the electron beam drift value of picture tube, improve the mechanical strength of shadow mask, and guarantee display effects such as better colorimetric purity, brightness uniformity and unit white field homogeneity, guarantee glass bulb intensity, improve the picture quality of color picture tube, realize slimming.

The technical solution of the utility model is achieved in that

The utility model comprises significant surface pars convoluta, shirt rim portion and fillet surface portion three parts, the significant surface pars convoluta is crossed and is received fillet surface portion and link to each other with shirt rim portion, the thickness of three parts is 0.18mm～0.25mm, curved surface is distributed as repeatedly the power item and distributes, the height nonlinear change of its curved surface from the center to the edge, center with significant surface pars convoluta curved surface is a reference point, and the curved surface height of significant surface pars convoluta corner is 15mm～35mm.

Effectively the grate opening on the curved face part is by size distribution, and the aperture of grate opening is 0.175mm～0.195mm, the aperture of grate opening by the center to four jiaos of increases.

Adjacent grate opening spacing is horizontal pitch PH, the scope of pars intermedia horizontal pitch PH is 0.70mm～0.75mm, the scope of significant surface pars convoluta four bight horizontal pitch PH is 1.05mm～1.30mm, and horizontal pitch PH is by center linear increase to both sides of significant surface pars convoluta.

Characteristics of the present utility model are to have adopted novel shadow mask grid to distribute and curvature distribution.Shadow mask makes grid redistribute by pitch size by the horizontal pitch that changes between each row of shadow mask grid; By the pore size that changes grid grid is redistributed by pore size; Make the difference redistribution of curved surface by changing shadow mask curvature by height.Adopt the above technology to reduce the electron beam drift value of slimming color picture tube greatly, guaranteed colour purity performance, brightness uniformity and the unit white field homogeneity of slimming color picture tube.

Use the shadow mask of described slimming color picture tube, solved the pure flat super slight type color picture tube of 74cm when wide-angle deflection owing to screen angle on R (red), G (green), B (indigo plant) electron beam reduce to cause the problem of aspects such as screen, brightness and white field.When this shadow mask was applied to the super slight type color picture tube of 74cm113 ° of deflection angle, its electron beam drift value can guarantee unit white field homogeneity and brightness uniformity.

Adopt the shadow mask of the utility model design, make picture tube under the constant situation of display area, length shortens greatly, and thickness is thinner, volume is littler, display quality is higher, thereby has reduced the occupied space of picture tube.

Description of drawings

Fig. 1 adopts the super slight type color picture tube structural representation;

Fig. 2 is a structural representation of the present utility model;

Fig. 3 is the utility model grizzly level pitch schematic diagram.

Below in conjunction with accompanying drawing content of the present utility model is described in further detail.

Embodiment

With reference to shown in Figure 1, the pure flat super slight type color picture tube of 74cm of the present utility model comprises phosphor screen 1, glass awl 2, molded aperture mask 3, framework 4, inner magnetic screen 5, electron gun 6, deflecting coil 7.Phosphor screen 1 and glass awl 2 is an one by frit seal, molded aperture mask 3 welds together with framework 4 becomes shadow mask-frame assembly, shadow mask-frame assembly is connected with phosphor screen 1 by spring leaf, inner magnetic screen 5 and framework 4 are connected by jump ring, electron gun 6 sealing-ins are at the afterbody of glass awl 2, phosphor screen 1, glass awl 2, molded aperture mask 3, framework 4, inner magnetic screen 5 and electron gun 6 are formed an obturator like this, and its inside is vacuum, and deflecting coil 7 is installed in the outside of the glass awl 2 of this obturator.Its operation principle is that R (red), G (green), B (indigo plant) electron beam that electron gun 6 emits bored the deflection of the magnetic deflection field of deflecting coil 7 generations on 2 by being installed in glass, the molded aperture mask 3 that supports via framework 4 select look after beat on the phosphor screen 1 that is coated with R (red), G (green), B (indigo plant) three-color phosphor, demonstrate good, white field of colour purity and even brightness image then.

The thickness of described shadow mask 3 is 0.18mm～0.25mm.Ordered series of numbers grid 11 is distributing on the shadow mask 3, level interval difference from the pars intermedia of shadow mask 3 to four bight grids 11, the horizontal pitch of shadow mask 3 pars intermedia grids, 11 each row center and adjacent column is 0.70mm～0.75mm, and the horizontal pitch of shadow mask 3 four bight grids, 11 each row center and adjacent column is 1.05mm～1.30mm.

The curved face part of described shadow mask 3 be ten coefficients or the more repeatedly power item of multiple index distribute, the height nonlinear change of its curved surface from the center to the edge is a reference point with the center of shadow mask 3 curved surfaces, the curved surface height of corner is 15mm～35mm.The curved surface of described shadow mask 3 distributes and has guaranteed that the assortment on phosphor screen 1 of R (red), G (green), B (indigo plant) electron beam requires and select the look requirement, and guarantees that shadow mask 3 has enough mechanical strengths.

With reference to shown in Figure 2, the pure flat ultra-thin color kinescope shadow mask 3 of 74cm of the present utility model comprises fillet surface portion 10 three parts between effective curved face part 8, shirt rim portion 9 and effective curved face part 8 and the shirt rim portion 9.Effectively curved face part 8 and fillet surface portion 10 are unified whole curved surface, adopt unified surface equation to describe, and surface equation is that the repeatedly power item of eight coefficients or higher coefficient distributes the height nonlinear change of its curved surface from the center to the edge.Grid 11 is distributed on effective curved face part 8 of shadow mask 3.The grid 11 of the effective curved face part 8 of the utility model is by size distribution, the aperture of grid 11 by the center to four jiaos of increases.

With reference to shown in Figure 3, local detail for grid 11, the central horizontal distance of wherein adjacent two grate openings 12 and grate opening 13 is horizontal pitch PH, effective curved face part 8 pars intermedia horizontal pitch PH of shadow mask 3 are 0.70mm～0.75mm, effective curved face part 8 four bight horizontal pitch PH of shadow mask 3 are 1.05mm～1.30mm, and horizontal pitch PH is by effective curved face part 8 centers non-linear increase to both sides of shadow mask 3.

The curved surface of the pure flat ultra-thin color kinescope shadow mask of 74cm of present embodiment is that repeatedly the power item distributes, and the height nonlinear change of its curved surface from the center to the edge is a reference point with the center of aperture mask curved surface, and the curved surface height of corner is 33.7mm.The shadow mask that this curved surface distributes has guaranteed that the assortment of electron beam on phosphor screen requires and select the look requirement, and has enough mechanical strengths, and its surface description is as follows:

H＝A ₁X ²+A ₂X ⁴+A ₃X ⁶+A ₄Y ²+A ₅X ²Y ²+A ₆X ⁴Y ²+A ₇Y ⁴+A ₈X ²Y ⁴+A ₉X ⁴Y ⁴+A ₁₀Y ⁶

Wherein:

A1：4.55734466024042E-05～3.03822977349362E-05

A2：8.89258983291841E-09～5.92839322194561E-09

A3：-3.34036906739281E-14～-2.22691271159521E-14

A4：5.00190722588039E-04～3.33460481725359E-04

A5：-4.18439868859841E-10～-2.78959912573227E-10

A6：2.47049549439701E-14～1.64699699626467E-14

A7：-3.80128528635364E-09～-2.53419019090242E-09

A8：6.31884140338837E-14～4.21256093559225E-14

A9：-2.53100195309366E-18～-1.68733463539578E-18

A10：9.36160781526443E-14～6.24107187684295E-14

Claims (3)

1, a kind of shadow mask that is used for thin cathode ray tube, comprise significant surface pars convoluta (8), shirt rim portion (9) and fillet surface portion (10) three parts, the significant surface pars convoluta is crossed and is received fillet surface portion and link to each other with shirt rim portion, it is characterized in that, the thickness of three parts is 0.18mm～0.25mm, curved surface is distributed as repeatedly the power item and distributes, the height nonlinear change of its curved surface from the center to the edge, center with significant surface pars convoluta (8) curved surface is a reference point, and the curved surface height of significant surface pars convoluta corner is 15mm～35mm.

2, the shadow mask that is used for thin cathode ray tube according to claim 1, it is characterized in that, effectively the grate opening (12) on the curved face part (8) is by size distribution, and the aperture of grate opening (12) is 0.175mm～0.195mm, the aperture of grate opening (12) by the center to four jiaos of increases.

3, the shadow mask that is used for thin cathode ray tube according to claim 1, it is characterized in that, adjacent grate opening (12) spacing is horizontal pitch PH, the scope of pars intermedia horizontal pitch PH is 0.70mm～0.75mm, the scope of significant surface pars convoluta (8) four bight horizontal pitch PH is 1.05mm～1.30mm, and horizontal pitch PH is by center linear increase to both sides of significant surface pars convoluta (8).

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