CN2849952Y - Weight-reduced high-brightness plane glass screen for colour CRT and forming die - Google Patents

Abstract

The utility model relates to a plane glass screen used for color cathode ray tubes, which is provided with a panel which is basically a rectangle, and the outer surface of the panel is basically a plane, wherein on the basis of the prior art of glass screen panel outer surfaces, a Z point on the outer surface of the panel reduces delta H along the direction pointing a seal connection edge and the delta H satisfies the relationship of 0.05<=delta H/H<= 0.15. The height difference of the Z point and the points outside an effective surface region of the glass screen panel maintains constant in the Z direction, the Z direction height of the central point (F/C) of the panel outer surface maintains constant, and other parts smoothly transmit. The utility model is used for increasing delta H of a concave mould in set moulds of the plane glass screens according to the Z point of the plane glass screen compared with the existing concave mould surfaces along guiding forming perpendicular line direction. The outer surface of the utility model attains reasonable and optimized design, and the utility model reduces weight and increases the brightness of the periphery part of the plane glass screen panels and the brightness homogeneity of images on the entire panel.

Description

The weight reduced type planar glass screen in high brightness of colorful cathode ray tube and molding concave die

Technical field

The utility model relates to a kind of planar glass screen that is used for color cathode ray tube, more specifically to a kind of planar glass screen that is used for the color picture tube of television set or display.

Background technology

Planar glass screen is extensive use of in color cathode ray tubes such as television set and computer display (CRT) now, with sphere common before replacing, cylindrical or parabola shaped glass screen, so that the dazzle that improves visuality and reduce to cause owing to external light reflection.

With reference to figure 1, figure has represented to be used in the prior art planar glass screen schematic sectional view of CRT.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, the radius of curvature of the outer surface 12a of panel 12 is generally all greater than 10000mm in the prior art, 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, make the planar glass screen panel that very high shim values be arranged, so the light transmittance that causes the panel outer peripheral portion is less than the light transmittance at face plate center place, thereby the image that shows is less than brightness at the face plate center place in the brightness of panel outer peripheral portion, causes image brightness irregularities on whole planar glass screen panel.Because the planar glass screen panel has very high shim values, also increased the weight of glass screen to a certain extent in addition.

Summary of the invention

The purpose of this utility model is to provide a kind of planar glass screen that is used for color cathode ray tube, pass through the outer surface of reasonably optimizing design plane glass panel plate on the basis of existing technology, thereby improve the brightness of planar glass screen panel outer peripheral portion, overcome the defective of image brightness irregularities on whole planar glass screen panel, alleviate the weight of glass screen simultaneously.

The purpose of this utility model also is to provide a kind of die that is used for the die set of planar glass screen moulding.

For achieving the above object, the technical solution adopted in the utility model is: a kind of weight reduced type planar glass screen in high brightness of colorful cathode ray tube, it has rectangular substantially and outer surface is the panel on plane substantially, the existing glass panel plate outer surface of the Z point of panel outer surface reduces Δ H along the direction of pointing to the sealing-in limit, point and Z point outside the glass panel plate significant surface zone remain unchanged in the difference in height of Z direction, the Z direction height at the center of panel outer surface remains unchanged, other parts seamlessly transit, wherein the Z point is the curvature measurement point of the outer surface outside the glass panel plate significant surface zone, and the Z direction is the normal orientation of sensing glass panel plate outer surface central point on the plane, place, sealing-in limit of glass screen.

Δ H satisfies relational expression $0.05\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.15,$ Wherein H is the thickness of glass at existing glass panel plate Z point place.Wherein,

Preferable range be $0.06\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.10.$

The utility model also provides a kind of die that is used for the die set of described planar glass screen moulding, and this die is used for the outer surface of moulding glass screen, and die increases Δ H corresponding to existing die surface, planar glass screen Z point place along the vertical line direction of pointing to moulding.

Δ H satisfies relational expression $0.05\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.15,$ H is the thickness of glass at existing glass panel plate Z point place.Wherein,

Preferable range be $0.06\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.10.$

The planar glass screen of the color cathode ray tube that the utility model provides passes through on the basis of the glass panel plate outer surface of prior art, reduce the Z point of glass panel plate outer surface along the direction of pointing to the sealing-in limit, point and Z point outside the glass panel plate significant surface zone remain unchanged in the difference in height of Z direction, the Z at the center of panel outer surface (F/C) is to highly remaining unchanged, other parts seamlessly transit, attenuate the thickness of glass of planar glass screen panel outer peripheral portion, reduced planar glass screen panel shim values, thereby improved the light transmittance of planar glass screen panel outer peripheral portion, dwindled the gap between the light transmittance that planar glass screen panel outer peripheral portion and center (F/C) locate, make image brightness on whole planar glass screen panel obtain homogenizing, improved the brightness of panel outer peripheral portion, alleviate the weight of glass screen simultaneously, satisfied the lightweight of planar glass screen and the requirement of high brightness.

Description of drawings

Fig. 1 is for being used for the planar glass screen schematic sectional view of CRT in the prior art;

Fig. 2 is the comparison schematic sectional view of the planar glass screen panel outer surface of planar glass screen panel outer surface of the present utility model and prior art;

Fig. 3 is the mould generalized section that is used for moulding the utility model planar glass screen;

Embodiment

Colorful cathode ray tube planar glass screen with prior art is the same, with reference to figure 1, 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, and panel 12 has flat outer surface 12a basically and the inner surface 12b of certain curvature radius is arranged.

According to planar glass screen of the present utility model, with reference to figure 2, it has rectangular substantially and outer surface is the panel on plane substantially, wherein the Z of panel outer surface point is on the basis of the glass panel plate outer surface of prior art, reduce Δ H along the direction of pointing to the sealing-in limit, wherein, 12a is the outer surface of prior art midplane glass screen, 12a ' is the outer surface of the utility model planar glass screen, and Δ H satisfies relational expression $0.05\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.15,$ Point and Z point outside the glass panel plate significant surface zone remain unchanged in the difference in height of Z direction, the Z at the center of panel outer surface (F/C) is to highly remaining unchanged, other parts seamlessly transit, wherein H is the thickness of glass at the glass panel plate Z point place of prior art, the Z point is the curvature measurement point (also claiming the curvature control point) of the outer surface outside the glass panel plate significant surface zone, and the Z direction is the normal orientation of sensing glass panel plate outer surface central point on the plane, place, sealing-in limit of glass screen.Described Z point has a plurality of, the former glass screen thickness difference at each Z point place, but the Δ H value that is reduced is identical.

If the size Δ H that the Z of panel outer surface point reduces satisfies $\frac{\mathrm{\&Delta;H}}{H}<0.05,$ Then the thickness of glass of planar glass screen panel outer peripheral portion is still thicker, and the light transmittance at this place is not well improved basically, and still there is bigger inhomogeneities in the brightness of image on whole front panel; If the size Δ H that the Z of panel outer surface point reduces satisfies $\frac{\mathrm{\&Delta;H}}{H}>0.15,$ Then there is bigger degree of curvature in the outer surface of planar glass screen panel at outer peripheral portion, certainly will cause the flatness of outer surface of face glass panel plate very poor, does not satisfy the requirement of planar glass screen. $0.05\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.15$ In the scope, according to designing requirements such as glass screen perimeter thicknesses, weight, flatnesses, Δ H all can suitably choose and realize the purpose of this utility model, and is preferred

For $0.06\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.10.$

The planar glass screen of a kind of color cathode ray tube that provides according to the utility model, by on the basis of the glass panel plate outer surface of prior art, reduce the Z point of glass panel plate outer surface along the direction of pointing to the sealing-in limit, point and Z point outside the glass panel plate significant surface zone remain unchanged in the difference in height of Z direction, the Z at the center of panel outer surface (F/C) is to highly remaining unchanged, other parts seamlessly transit, attenuate the thickness of glass of planar glass screen panel outer peripheral portion, reduced planar glass screen panel shim values, thereby improved the light transmittance of planar glass screen panel outer peripheral portion, dwindled the gap between the light transmittance that planar glass screen panel outer peripheral portion and center (F/C) locate, make image brightness on whole planar glass screen panel obtain homogenizing, improved the brightness of panel outer peripheral portion, alleviate the weight of glass screen simultaneously, satisfied the lightweight of planar glass screen and the requirement of high brightness.

Below table 1 show the comparison of comparative example under the same size situation of same type of the planar glass screen of the preferred embodiment of planar glass screen described in the utility model and prior art.Can find, the glass light transmittance of the panel periphery by adopting planar glass screen of the present utility model improves than the glass light transmittance of planar glass screen panel periphery of the prior art, the uniformity coefficient of image brightness on whole front panel also will be higher than planar glass screen of the prior art, and the weight of whole planar glass screen also obtains alleviating to a great extent in addition.

Example	Z point thickness of glass (mm)	The light transmittance that Z is ordered (%)	The uniformity coefficient of brightness (%)	Glass screen weight (kg)
					Embodiment	22.42	36.25	63.60	9.76
Comparative example	24.74	32.95	57.80	10.48

Planar glass screen according to the utility model structure is formed by mould molding.With reference to Fig. 3, die set is made up of punch 1, die 2 and mould circle 3 three parts, and punch is used for the inner surface of moulding glass screen, and die is used for the outer surface of moulding glass screen, and the mould circle is used to seal the die cavity that is made of punch and die.Wherein die increases Δ H corresponding to existing die surface, planar glass screen Z point place along the vertical line direction of pointing to moulding, and Δ H satisfies relational expression $0.05\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.15,$ Wherein H is the thickness of glass at existing glass panel plate Z point place.

Preferable range is $0.06\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.10.$ The molding mode of glass screen is: the glass of fusion is splashed in the opening cavity that die, mould circle constitute with the form of gob, and punch descends with certain speed then, the glass gob in the Extruding die.Along with punch constantly descends, glass gob constantly punch and die surface flows to the direction of mould circle, and after to a certain degree, punch stops to descend, and this is the full die cavity that is formed by punch, die and mould circle of glass gob complete filling.Carry out pressurize subsequently, during pressurize, the cooling duct of the cooling system of punch inside, die outside and low ambient temperature cool off the glass screen together, become glass screen 4 up to the glass solidification of fusion, and so complete glass screen finishes with regard to moulding.In addition, 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, can have bigger thermal stress and distortional stress in the glass screen, so after moulding is finished, still need the glass screen is carried out the stress relief annealing operation.

Claims (6)

1. the weight reduced type planar glass screen in high brightness of a colorful cathode ray tube, it has rectangular substantially and outer surface is the panel on plane substantially, it is characterized in that, the existing glass panel plate outer surface of the Z point of panel outer surface reduces Δ H along the direction of pointing to the sealing-in limit, point and Z point outside the glass panel plate significant surface zone remain unchanged in the difference in height of Z direction, the Z direction height at the center of panel outer surface remains unchanged, other parts seamlessly transit, wherein the Z point is the curvature measurement point of the outer surface outside the glass panel plate significant surface zone, and the Z direction is the normal orientation of sensing glass panel plate outer surface central point on the plane, place, sealing-in limit of glass screen.

2, planar glass screen as claimed in claim 1 is characterized in that, Δ H satisfies relational expression $0.05\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.15,$ Wherein H is the thickness of glass at existing glass panel plate Z point place.

3, planar glass screen as claimed in claim 2 is characterized in that, Preferable range be $0.06\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.10.$

4, a kind of die that is used for the die set of the described planar glass screen moulding of claim 1～3, this die is used for the outer surface of moulding glass screen, it is characterized in that, die increases Δ H corresponding to existing die surface, planar glass screen Z point place along the vertical line direction of pointing to moulding, and wherein the Z point is the curvature measurement point of the outer surface outside the glass panel plate significant surface zone.

5, die as claimed in claim 5 is characterized in that, Δ H satisfies relational expression $0.05\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.15,$ Wherein H is the thickness of glass at existing glass panel plate Z point place.

6, die as claimed in claim 6 is characterized in that,

Preferable range be $0.06\&le;\frac{\mathrm{\&Delta;H}}{H}\&le;0.10.$

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