CN101246798B - Thinned all-plane glass screen for colorful cathode ray tube - Google Patents

Abstract

The invention relates to a thinned full-flat glass screen for color cathode ray tubes, belonging to the field of cathode ray tubes production. The glass screen has a substantially rectangular panel, the thickness of the central point of the panel is H, the inner surface of the panel thins delta H towards the outer surface, points in different areas of the inner surface thins the same delta H, thevertical distance between the central point of the outer surface of the panel and a sealing surface reduces delta H accordingly. According to the invention, the thickness of the full-flat glass screenis reasonably optimized, the weight of the planar glass screen is reduced with the safety being guaranteed, the brightness of the image on the planar glass screen is increased, and the requirements of lightweight and high brightness are met.

Description

The colorful cathode ray tube thinned all-plane glass screen

Technical field

The invention belongs to the CRT glass screen production field, specially refer to a kind of colorful cathode ray tube thinned all-plane glass screen.

Background technology

Along with the development of new display spares such as liquid crystal, plasma, the shape of the face-plate of a cathode-ray tube also from traditional sphere to plane conversion.Flat panel is compared with the sphere panel can reduce image fault, easing eyes fatigue, guarantee wide viewing angle, this all is the desirable advantage of user, but its shortcoming also is conspicuous, after the panel outer surface flattening, be huge pressure differential inside and outside the opposing pipe, except that improving the panel stress distribution, also to increase the thickness of panel end, promptly increase the shim values of panel.In addition, fieriness along with market competition, colored picture tube manufacturer is in order to reduce cost, the numerous and confused material of making shadow mask that changes, the problem of following the shadow mask changes in material to bring is that the substitution material distortion is serious, changes the panel incurvature for offsetting thermal deformation, and panel end thickness is further increased, be that shim values further increases, this forms very adverse factors with regard to counter plate factory.

Variation on the panel designs, brought difficulty for the production of panel factory, the increase of panel end thickness, a series of problems such as cause panel weight to increase, thermal deformation is serious, data are unstable and production efficiency is low, the problem of bringing to homogeneous tube is problems such as brightness is low, contrast is bad.

With reference to figure 1, represented to be used in the prior art planar glass screen schematic cross sectional view of CRT among the figure.This also is a traditional planform, this planar glass screen 10 is by faceplate part 12, skirt portion 14 and be connected panel 12 and the corner part 13 in skirt section 14 is formed, panel 12 has flat outer surface 12a and the inner surface 12b that the certain curvature radius is arranged basically, and the radius of curvature of inner surface 12b will be far smaller than the radius of curvature of outer surface 12a.Planar glass screen panel outer peripheral portion thickness wants the thickness of glass of ratio panels center big like this, makes the planar glass screen panel that very high shim values be arranged.So-called shim values (WEDGE), with reference to shown in Figure 2, it is meant the difference of average thickness and center (F/C) thickness of four Zhi Zhudian (A, B, C, D) on the panel diagonal axis.Its raising has increased the weight of glass screen to a certain extent, has also influenced the brightness of panel.The expression-form of shim values is

WEDGE＝(A+B+C+D)/4-F/C

Illustrate: A, B, C, D and F/C are respectively the thickness of correspondence position among the figure in the formula.

Summary of the invention

Topic is during technology that the present invention need solve, in prior art, the planar glass screen of colorful cathode ray tube, exist the radius of curvature of the radius of curvature of screen inner surface much smaller than outer surface, make glass panel plate that very high shim values be arranged, not only increased glass screen weight, also influenced the light transmittance of panel plate, in order to overcome existing these many unfavorable factors, will shield the design that innovation is made on the plane to glass, the object of the present invention is to provide a kind of colorful cathode ray tube thinned all-plane face glass screen, on the basis of existing technology by the reasonably optimizing plate thickness, change radius of curvature, thereby reduce the weight of glass screen, simultaneously, can improve panel factory, the production efficiency of homogeneous tube factory, improve the brightness of pipe, performance parameters such as contrast, and then the market competitiveness of raising cathode ray tube.

For achieving the above object, the technical solution used in the present invention is: a kind of colorful cathode ray tube thinned all-plane glass screen, has rectangular substantially panel, face plate center point place glass screen thickness is defined as H, place, glass screen sealing-in limit thickness is T, it is characterized in that, by the reasonably optimizing plate thickness, change glass screen radius of curvature, select H, T satisfies relational expression 0.70≤H/T≤1.00, wherein H is the thickness of glass at glass panel plate F/C point place behind the attenuate, T is the standard thickness in glass screen bight, sealing-in limit (S/E), panel inner surface is along the direction attenuate Δ H that points to outer surface, and the Δ H of the some attenuate in the variant zone of inner surface equates, the corresponding reduction Δ of the vertical range H on the central point of panel outer surface and plane that sealing surface forms.In addition, the preferable range of H/T is 0.75≤H/T≤0.95.In process of the test, comprised the stress after the compression moulding of glass screen has been handled.The invention has the beneficial effects as follows, this attenuate type planar glass screen, the thickness of glass of its panel is tending towards ideal thickness, in the weight that guarantees to have alleviated on the planar glass screen foundation for security glass screen, improve the brightness of planar glass screen panel, satisfied the requirement of planar glass screen lightweight and high brightness.

Description of drawings

Fig. 1 is the used common plane glass screen schematic cross sectional view of cathode ray tube in the prior art;

Fig. 2 is the Zhi Zhudian of glass panel plate and the location drawing of central point;

Fig. 3 is the bight thickness schematic diagram in cross section, glass panel plate sealing-in limit (S/E);

Fig. 4 is that planar glass screen plate thickness of the present invention and original glass panel plate thickness compare schematic cross sectional view.

Embodiment

With reference to Fig. 1, the same with colorful cathode ray tube planar glass screen of the prior art, planar glass screen 10 is made up of faceplate part 12, skirt portion 14 and the corner part 13 that is connected panel and skirt section, and panel has flat outer surface 12a basically and the inner surface 12b of certain curvature radius is arranged.With reference to Fig. 2, Fig. 3, represent the Zhi Zhudian and the sealing-in corner portion thickness schematic diagram of glass panel plate respectively, ABCD is respectively the Zhi Zhudian at four angles among the figure, and F/C is a central point, and the bight standard thickness of sealing-in limit S/E is T.

With reference to Fig. 4, represent planar glass screen of the present invention, it has rectangular substantially panel, wherein panel inner surface is on the basis of prior art glass panel plate inner surface, along the direction attenuate Δ H that points to outer surface, wherein, 12b is the inner surface of primary plane glass screen, 12b ' is the inner surface of planar glass screen of the present invention, H satisfies relational expression 0.70≤H/T≤1.00, the Δ H of the some attenuate of inner surface zones of different equates, the corresponding reduction Δ of the vertical range H on central point of panel outer surface (F/C) and sealing surface (S/E) plane that forms, and wherein H is the thickness of glass at glass panel plate F/C point place behind the attenuate.

The accumulation that a large amount of practices are measured learns that if satisfy H/T＞1.00 behind the panel inner surface attenuate Δ H, then the thickness of glass of planar glass screen panel is still thicker, does not reach the purpose that reduces glass screen thickness and improve the brightness of glass screen; If reducing, panel inner surface satisfies H/T＜below 0.70, certainly will cause the security performance of glass panel plate bad behind the Δ H.Know in the practice that in 0.70≤H/T≤1.00 scopes, according to the designing requirement of glass screen, H all can suitably choose and realize purpose of the present invention, preferred H/T is 0.75≤H/T≤0.95.

According to this colorful cathode ray tube planar glass screen provided by the invention, attenuate the thickness of planar glass screen, the brightness that has improved planar glass screen panel epigraph.

Below table 1 show the preferred embodiment of planar glass screen of the present invention and the comparative example of prior art planar glass screen.Can find that improve by the glass light transmittance that adopts planar glass screen panel of the present invention, the weight of whole planar glass screen has obtained alleviating to a great extent.

Table 1

Example	F/C point thickness of glass (mm)	The light transmittance that F/C is ordered (%)	Glass screen weight (kg)
				Embodiment	10.00	81.27	9.87
Comparative example	11.00	73.88	10.27

The molding mode of glass screen is: the glass of fusion has been splashed into die with the form of gob, in the opening cavity that the mould circle constitutes, punch descends with certain speed then, glass gob in the Extruding die, along with punch constantly descends, glass gob is constantly flowed to the direction of mould circle by punch and die surface, after to a certain degree, punch stops to descend, at this moment the glass gob complete filling is full of punch, the die cavity that die and mould circle form, carry out pressurize subsequently, between hold period, the cooling system of punch inside, the cooling duct of die outside cools off the glass screen together, becomes the glass screen up to the glass solidification of fusion.

Because picture tube is the glass devices that a kind of inside is the high vacuum state, thereby can be subjected to very high atmospheric pressure in the pipe, and the stress difference that is subjected to of different piece, accidentally just be easy to fragmentation.In three parts of screen, awl, neck of picture tube glass bulb, shield and be key position, secondly be awl, neck is the safest, and is therefore particularly important at the annealing of thinned all-plane glass screen residual stress.

Because the glass screen is in forming process, very big distortion has taken place and has crossed over huge temperature difference in the melten glass that constitutes the glass screen, in the temperature changing process from high temperature to low temperature, exists certain temperature gradient between its ectonexine, has just produced temporary transient thermal stress.When glass metal enters mould compression moulding and when leaving shaping mould, because the cooling effect of mould, its shape is fixing, and the envelope surfaces cooling is very fast, and the internal layer cooling is slower, outer cooling rate is greater than the internal layer cooling rate, outer to internal layer, because volume contraction will produce compression, internal layer then produces tensile stress to skin, when tensile stress during greater than compression, the situation of glassy shell crack just might take place.

Annealing is the important process process of glass production, and the annealing of thinned all-plane glass screen is particularly important to its quality aborning.The product of all size is except that thickness and size there are differences, and same specification product thickness separately also there are differences.Make each product and each several part thereof can both reach good annealing purpose, eliminate The stress of glass, just must formulate and to satisfy technological specification, system, the standard that its each several part annealing requires according to different product, the detection of the glass screen residual stress after the compression moulding, there are panel, bight, skirt face and sealing-in limit in the position of its detection, guarantee the residual stress of glass screen after the compression moulding by the stress apparatus measures, show according to long-term testing result, inside and outside stress difference＜the 8MPa in its glass screen center, the inside and outside stress difference＜7MPa in other position.If surpass this scope, might make product glass burst phenomenon and take place.

Claims (3)

1. colorful cathode ray tube thinned all-plane glass screen, has rectangular substantially panel, face plate center point place glass screen thickness is defined as H, place, glass screen sealing-in limit thickness is T, it is characterized in that, by the reasonably optimizing plate thickness, change glass screen radius of curvature, select H, T satisfies relational expression 0.70≤H/T≤1.00, wherein H is the thickness of glass at glass panel plate F/C point place behind the attenuate, and T is the standard thickness in glass screen bight, sealing-in limit (S/E), and panel inner surface is along the direction attenuate Δ H that points to outer surface, the Δ H of the some attenuate in the variant zone of inner surface equates, the corresponding reduction Δ of the vertical range H on the central point of panel outer surface and plane that sealing surface forms.

2. colorful cathode ray tube thinned all-plane glass screen according to claim 1 and 2 is characterized in that, the preferable range of H/T is 0.75≤H/T≤0.95.

3. colorful cathode ray tube thinned all-plane glass screen according to claim 1 and 2 is characterized in that, inside and outside stress difference＜8MPa is surveyed in glass screen place, center, the inside and outside stress difference＜7Mpa in other position.

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