CN1638011A - Glass screen for cathode-ray tube - Google Patents

Abstract

The present invention provides a glass screen for cathode radial tube. By optimizing the face condition of a chamfer formed at an intersecting member with the inside and outside surfaces of the skirt part of a panel and a sealing end face to prevent the undesired sagging of a frit glass and avoid the damage resulted from a residual deposition such as dirt, while previously preventing the occurrence of so-called triangular cracking during sealing heat treatment with the panel and a funnel. So a first rough face 11 that the average depth Rz of unevenness is 5[mu]m<=Rz<=30[mu]m and the average period Sm is 100[mu]m<=Sm<=400[mu]m, when the average depth of the unevenness is Rz and the average period is Sm, is formed on the surface of an outside chamfering part 8, while forming an outside chamfering part 8 at the intersecting member with the outer surface 10 of the skirt part 5 of the panel 1 and the sealing end face 6. The first rough face 11 is formed on a region over all of the sealing end face 6, or a predetermined region including a diagonal axis DA on the outside chamfering part 8, or a center section in the longitudinal direction of the side portion 4 on the outside chamfering part 8.

Description

Glass screen for cathode-ray tube

Technical field

The present invention relates to glass screen for cathode-ray tube, in more detail, relate to the chamfered section of cross part of the interior lateral surface of the marginal portion that is formed at this screen board and seal face and the improving technology of surface state on every side thereof.

Background technology

As everyone knows, used cathode ray tube in the display unit of colour TV receiver etc., have mirror image picture tube cathode-ray tube with glass screen (being designated hereinafter simply as screen board) and roughly be funnelform glass funnel for CRT (being designated hereinafter simply as funnel) as main glass component.As shown in Figure 4, screen board 1 has the fluorescent screen part 2 of essentially rectangular of active area of band presentation video and four limit portions 4 that are connected in this fluorescent screen part 2 via the compound R part 3 of fluorescent screen periphery, constitute marginal portion 5 by these limit portions 4, and on the openend of this marginal portion 5, be formed for carrying out the sealing-in end face 6 of sealing-in with above-mentioned funnel.

This screen board 1 be in the press molding operation by fused glass block (hereinafter referred to as filler) being supplied to holding in the mould (former) that bed die (substrate mould) and side form (shell metal pattern) constitute, be shaped by extrusion die (plunger metal pattern) pressurization.Then, after this press molding operation finishes, carry out the grinding step that the required part of screen board is ground as required.

In above-mentioned press molding operation, this screen board is easy to separate (release property is good) from substrate mould and even shell metal pattern when preferably taking out screen board from the substrate mould, and then, the wrinkle flaw of glass preferably can not take place.From such viewpoint, in with following patent documentation 1～4, following structure is disclosed according to such needs, from the outer surface of screen board 1 on the curve part of marginal portion 5 and even the lateral surface of marginal portion 5 (being lateral surface and medial surface the patent documentation 4), form the small concavo-convex matsurface of forming by regulation.

In addition, the sealing-in end face 6 of the marginal portion 5 of this screen board 1 is preferably removed dirt easily, preferably forms in the mode of raising with the sealing strength of funnel in addition, and then the mode that preferably is difficult to bring penetrating wound (broad ways runs through the scar of sealing-in end face) forms.From such viewpoint, in following patent documentation 5,6, according to such needs following structure is disclosed, on the sealing-in end face 6 of screen board 1, form the small concavo-convex matsurface of forming by regulation.

[patent documentation 1] TOHKEMY 2000-302464 communique

[patent documentation 2] Japanese Patent Publication 38-4383 communique

[patent documentation 3] Japan opens clear 55-137450 communique in fact

[patent documentation 4] Japan opens clear 54-26354 communique in fact

[patent documentation 5] TOHKEMY 2002-324497 communique

[patent documentation 6] Japanese kokai publication hei 11-40081 communique

Summary of the invention

In above-mentioned patent documentation 1～4, only discuss at the interior lateral surface of the marginal portion 5 of screen board 1, in addition in above-mentioned patent documentation 5,6, only discuss at the interior lateral surface of the sealing-in end face 6 of screen board 1.But, in this screen board 1, on the cross part of the lateral surface of marginal portion 5 and sealing-in end face 6, form chamfered section sometimes.However, not only in patent documentation 1～6 even in other patent documentations and non-patent literature, also without any record at the surface state of this chamfered section.

So, under present situation, owing to for example extensively adopt the method that sandblasts as on the forming face of metal pattern, forming concavo-convex method, after the shaping of screen board 1, carry out reasons such as the formation of chamfered section or its final processing in addition sometimes by grinding, chamfered section becomes minute surface or minute surface roughly usually.In addition, the easiness that dirt is removed obtains paying attention to also becoming main cause, and makes chamfered section generally become minute surface or minute surface roughly.

But, if like this chamfered section becomes minute surface or minute surface roughly, the scar (penetrating wound) that especially occurs easily abrading etc. then in its across corner, in addition, in the temperature-rise period when the sealing-in of screen board 1 and funnel, especially on the across corner of the chamfered section in the outside, produce thermal stress and concentrate.Accompany therewith, generation is the crackle of starting point with this wound, this crackle makes progress in temperature-rise period simultaneously, from beginning to produce to the scope of each limit portion 4 breakage of triangle taper around the across corner of chamfered section, the so-called critical defect that is called as the triangle breakage takes place promptly thus.Such fault is not flattened along with the fluorescent screen part outer surface of screen board 1 and becomes remarkable.

And, if chamfered section is minute surface or minute surface roughly as described above, then can cause such as shown below problem.That is, as shown in Figure 5, to the sealing-in of screen board 1 and funnel 20 time, in its initial stage, on the sealing surface 26 of funnel 20, have between wherein state mounting with melten glass 30 to make sealing-in end face 6 screen board 1 down, the 6 pairs of melten glass 30 of sealing-in end face by this screen board 1 push.Thus, melten glass 30 is being extruded to inside and outside both sides, gush out upward simultaneously, once shown in chain-dotted line among this figure, becoming the state or the approaching therewith state of the chamfered section 27,28 of the chamfered section 7,8 that roughly covers screen board 1 equably and funnel 20 like that along the inboard of screen board 1 and the chamfered section 7,8 in the outside.But, if the chamfered section 7,8 of screen board 1 is minute surface or minute surface roughly, then once swarmed next melten glass 30 along chamfered section 7,8, along with the process of time is sagging, mobile along chamfered section 7,8 easily, this melten glass 30 become low temperature and till solidifying during in, like that, melten glass 30 just becomes the state that hangs down unusually shown in solid line among this figure.Then, behind state that the chamfered section 7,8 that becomes screen board 1 is exposed or close therewith state, damaged and can not obtain durability on the glass-vacuum tube 40 that obtains at sealing-in screen board 1 and funnel 20 with regard to easy generation, so just bring problems such as for example in checking operation, having to scrap processing as defective item.

In addition, for fear of such problem chamfered section 7,8 is got final product for matsurface, the dirt that is attached to chamfered section 7,8 in the screen board production process etc. is become be difficult to come off but only make matsurface simply, just raise so under the residual state that dirt etc. arranged still, make the probability of glass-vacuum tube.Then, with such glass-vacuum tube as under the situation of cathode ray tube, just might cause that at dirt etc. residual takes place that electric field is concentrated and the new problem of bringing out the breakage etc. and so on of cathode ray tube.

The present invention In view of the foregoing finishes, the technical problem that it solved is, the surface state optimization of the chamfered section on the lateral surface by making the marginal portion that is formed at screen board and the cross part of sealing-in end face, so-called triangle breakage takes place when possibly preventing the sealing-in heat treatment of screen board and funnel, prevent the sagging unusually of melten glass simultaneously, and avoid adhering to the unusual of the residual electrical action that causes because of dirt etc.

For solving the problems of the technologies described above, technical scheme of the present invention provides a kind of glass screen for cathode-ray tube, adopt following structure, promptly has roughly rectangular fluorescent screen part and by compound R part of the fluorescent screen periphery that constitutes arc-shaped surface by some different curvature radius and the marginal portion that is connected with fluorescent screen part approximate vertical, wherein, it is each limit portion of boundary that above-mentioned marginal portion has with the diagonal axis, and has the sealing-in end face at its openend, it is characterized in that: form outside chamfered section at the lateral surface of above-mentioned marginal portion and the cross part of sealing-in end face, and the surface of above-mentioned outside chamfered section is roughness, the mean depth Rz that it is concavo-convex and the satisfied respectively 5 μ m≤Rz of Sm average period≤30 μ m, 100 μ m≤Sm≤400 μ m, chamfered section surface, the above-mentioned outside is called first matsurface.In addition, outside chamfered section preferably is formed at inclined plane (C face) or the inclined plane roughly on 1/50～1/5 the zone of face width of sealing-in end face, but also can be for being formed on arc surface (R face) or the arc surface roughly on the same area.In addition, the mensuration of above-mentioned Rz and Sm is abideed by JIS B0601:1982 standard.

According to such structure, the surface that is formed at the chamfered section on the cross part of the lateral surface of marginal portion of screen board and sealing-in end face has and is not minute surface or first matsurface of minute surface roughly, on this basis, the Rz of this first matsurface and Sm are in the above-mentioned number range, so be difficult on the chamfered section of the outside, produce penetrating wound (broad ways connects the scar of chamfered section), the probability of happening of the so-called triangle breakage during the sealing-in heat treatment of screen board and funnel is just reduced, and the unusual sagging of melten glass just suppressed, and then because of adhering to unusually just being avoided of caused electrical action such as residual soil.

That is to say, if hypothesis Rz＜5 μ m, then because the concavo-convex degree of depth is too small, so the time via melten glass sealing-in screen board and funnel, once swarm sagging just the flowing down of melten glass of coming and to be able to abundant inhibition along outside chamfered section, melten glass after the curing just becomes unusual hang, just is difficult to obtain good sealing-in shape.On the contrary, if hypothesis Rz＞30 μ m, then because the concavo-convex degree of depth is excessive, during intensification in sealing-in screen board and funnel process, just on the mutual Temperature Distribution of recess and protuberance, produce uneven, the softening flowing velocity that is contacted with the melten glass of outside chamfered section differs greatly on recess and protuberance, so be difficult to uniform condition melten glass be soaked on the chamfered section of the outside and react, also is difficult to obtain good sealing-in shape in this case.Thereby, avoiding on these problem this point, Rz is in the above-mentioned number range for well.

In addition, if hypothesis Sm＜100 μ m, then because recess narrow, because of melten glass is that the pulpous state with viscosity makes melten glass be difficult to be filled in the recess, residual in recess for this reason have air, thereby cause the sealing strength between the outside chamfered section and the melten glass and the decline of thing followed heat seal strength.And if like this recess is narrow, the dirt etc. that then is attached to outside chamfered section in the manufacturing process of screen board is difficult to come off, so cause in recess the state of affairs of manufacturing glass-vacuum tube and so under still remaining the situation of dirt.And, with such glass-vacuum tube as under the situation of cathode ray tube, will charge concentration etc. take place remaining of dirt etc., and might bring out unusual (for example, the insulation breakdown) of electrical action.On the contrary, if hypothesis Sm＞400 μ m, then because recess is wide, become smooth surface on the whole, can not suppress to produce the situation of penetrating wound reliably, and when sealing-in screen board and funnel, once swarm the melten glass situation sagging and that flow down of coming and just can't be able to abundant inhibition, and be difficult to obtain good sealing-in shape along outside chamfered section.And if be smooth surface on the whole like this, then the contact area of outside chamfered section and melten glass diminishes, and just might cause the decline of sealing strength.Thereby for fear of these problems, Sm is in the above-mentioned number range for well.

And, satisfy respectively at first matsurface of outside chamfered section under the situation of 5 μ m≤Rz≤30 μ m, 100 μ m≤Sm≤400 μ m and just can enjoy above-mentioned cited advantage, and Rz only be in the above-mentioned number range or only Sm be under the situation in the above-mentioned number range and just can not enjoy such advantage.That is to say, not be in the appropriate number range if the value of Rz and Sm is not the both, just can not obtain with aspects such as the contact conditions of melten glass or soil release on have the result of good surface characteristic.Analyze and consider above item, the Rz of first matsurface of outside chamfered section and Sm preferably satisfy the condition of 10 μ m≤Rz≤20 μ m, 160 μ m≤Sm≤350 μ m respectively.

In this case, if main, then be preferably in and form first matsurface on the regulation zone that comprises diagonal axis in the chamfered section of the above-mentioned outside to prevent the purpose that occurs as of so-called triangle breakage.Specifically, the zone that forms above-mentioned first matsurface is preferably from the zone of diagonal axis below the above 100mm of the 5mm of vertical central portion side of each limit portion.

So, owing to around the across corner of outside chamfered section, be difficult to occur connecting scar, so be that the generation of crackle of starting point and the probability of happening of the so-called triangle breakage that causes because of the stretching, extension of this crackle just reduce sharply with such scar.

With respect to this,, then be preferably on vertical central portion of the limit portion in the chamfered section of the above-mentioned outside and form first matsurface if be purpose mainly with the heat seal strength that improves with melten glass.Specifically, the zone that forms first matsurface is preferably from except the 5mm zone of the vertical central portion of limit portion zone above 100mm below of diagonal axis towards vertical central portion side of each limit portion.In addition, especially first matsurface is preferably formed as in long leg, or be preferably formed as in come compared with short leg long leg one side for zone in longer size longitudinally on.

So, melten glass just well is filled in the recess on the surface of the vertical central portion of the limit of outside chamfered section portion, and, it is big that the contact area of its male and fomale(M﹠F) and melten glass becomes, thus, just be able to abundant raising with heat seal strength melten glass in that limit portion is vertical central portion, thereby improve the sealing strength with funnel efficiently.

In said structure, be preferably in continuously on this continuous part at least of the marginal portion lateral surface on the surface of the outside chamfered section that is used as above-mentioned first matsurface, form second matsurface, the concavo-convex mean depth Rz of this second matsurface with average period Sm be in the identical number range with above-mentioned first matsurface respectively.

So, when screen board and funnel sealing-in, once swarming to the melten glass of this continuous part of the consecutive lateral surface of outside chamfered section of marginal portion, on this continuous part, also make sagging, flow down and suppressed, so further be difficult to produce the unusual sagging of melten glass and the breakage of the glass-vacuum tube that causes thus etc.And, the continuous part that starts from outside chamfered section for the marginal portion lateral surface, even begin on the narrow and small zone till the position that separates about 3～10mm from outside chamfered section also passable, if but for example be made as the big zone till dotted line or spue line then release property is better.

In addition, for the surperficial consecutive sealing-in end face of the outside chamfered section that is used as above-mentioned first matsurface, preferably its concavo-convex mean depth Rz with average period Sm also be in respectively in the number range identical with above-mentioned first matsurface.

So, also carry out removing of dirt easily for the sealing-in end face, and, be difficult to produce penetrating wound, and can utilize melten glass and obtain desirable sealing strength.

In addition, for solving the problems of the technologies described above, technical scheme of the present invention provides a kind of glass screen for cathode-ray tube, adopt following structure, promptly has roughly rectangular fluorescent screen part and by compound R part of the fluorescent screen periphery that constitutes arc-shaped surface by some different curvature radius and the marginal portion that is connected with fluorescent screen part approximate vertical, wherein, it is each limit portion of boundary that above-mentioned marginal portion has with the diagonal axis, and has the sealing-in end face at its openend, it is characterized in that: form inboard chamfered section at the medial surface of above-mentioned marginal portion and the cross part of sealing-in end face, and the surface of above-mentioned inboard chamfered section is roughness, its concavo-convex mean depth Rz and the satisfied respectively 5 μ m≤Rz of Sm average period≤30 μ m, 100 μ m≤Sm≤400 μ m, above-mentioned inboard chamfered section surface is called the 3rd matsurface.In addition, the inboard chamfered section of this mode also can substitute the outside chamfered section of having said and form, or forms with above-mentioned outside chamfered section.In addition, inboard chamfered section is preferably inclined plane (C face) or the inclined plane roughly on 1/50～1/5 the zone of the face width that is formed at the sealing-in end face, but also can be the arc surface (R face) that forms or arc surface roughly on same area.

According to such structure, the surface of inboard chamfered section has the 3rd matsurface, thus such as argumentation just obtain the identical in fact action effect of situation that has first matsurface with the surface of outside chamfered section crossing.

In this case, above-mentioned the 3rd matsurface both can comprise in above-mentioned inboard chamfered section on the regulation zone of diagonal axis and having formed, in addition also can be different with it, but form on vertical central portion of the limit portion in inboard chamfered section.

So, such as argumentation cross just obtain like that with the regulation zone that in the chamfered section of the outside, comprises diagonal axis on formation first matsurface situation and with vertical central portion of limit portion in the chamfered section of the outside on the identical in fact action effect of situation that forms.

In above structure, be preferably in and be used as on this continuous part at least of medial surface of surperficial consecutive marginal portion of inboard chamfered section of above-mentioned the 3rd matsurface, form the 4th matsurface, the concavo-convex mean depth Rz of the 4th matsurface with average period Sm be in respectively in the number range identical with above-mentioned the 3rd matsurface.

So, such as argumentation cross just to obtain like that and can obtain identical action effect in fact with the situation of formation second matsurface on this continuous part at least of the surperficial consecutive marginal portion of the outside chamfered section that is used as first matsurface lateral surface.

As mentioned above, according to glass screen for cathode-ray tube of the present invention, the surface of formed outside chamfered section on the cross part of the lateral surface of marginal portion and sealing-in end face, it has first matsurface, the concavo-convex mean depth Rz of this first matsurface and average period Sm satisfy respectively: 5 μ m≤Rz≤30 μ m, the condition of 100 μ m≤Sm≤400 μ m, therefore be difficult on the chamfered section of the outside, produce penetrating wound, the probability of happening of the so-called triangle breakage of (during heat treatment etc.) in the time of reducing the sealing-in with funnel, and can suppress the unusual sagging of melten glass and obtain good sealing-in shape.In addition, can on the surface of outside chamfered section, melten glass be soaked into and react with uniform condition, and the heat seal strength of raising and melten glass, good sealing-in shape can also be obtained thus simultaneously.And, owing to can in the manufacturing process of screen board, easily remove the dirt etc. that is attached to outside chamfered section, so the insulation breakdown can avoid glass-vacuum tube with made under the state of still residual dirt in recess etc. to be used as cathode ray tube time the etc.In addition, the surface of formed inboard chamfered section on the cross part of the lateral surface of marginal portion and sealing-in end face has with above-mentioned first matsurface and is under the situation of the matsurface in the identical number range, also can enjoy advantage same as described above.

Description of drawings

Fig. 1 is the perspective view of glass screen of the cathode ray tube of expression embodiments of the present invention.

Fig. 2 is the perspective view of wanting portion of glass screen of the cathode ray tube of expression embodiments of the present invention.

Fig. 3 be expression use cathode-ray tube vacuum tube that the glass screen of the cathode ray tube of embodiments of the present invention makes want portion's amplification vertical profile front view.

Fig. 4 is the perspective view of the existing glass screen for cathode-ray tube of expression.

Fig. 5 be the expression shortcoming of using the cathode-ray tube vacuum tube that the glass screen of the cathode ray tube of embodiments of the present invention makes want portion's amplification vertical profile front view.

Embodiment

Following with reference to the description of drawings embodiments of the present invention.Fig. 1 is the perspective view of the glass screen for cathode-ray tube of expression embodiments of the present invention.Fig. 2 is the enlarged perspective of wanting portion of this screen board of expression, for via melten glass (frit glass) sealing-in this screen board and funnel glass-vacuum tube want portion's vertical profile front view.Wherein, the basic constituent element of screen board shown in Figure 1 is identical with the existing vacuum tube shown in Fig. 4, for both common identical symbols of essential structure mark, and omits its detailed description.

As shown in Figure 1, the cross part of the screen board 1 of embodiments of the present invention 5 lateral surface 10 and sealing-in end face 6 in the marginal portion has outside chamfered section (conical surface) 8, and in this embodiment, outside chamfered section 8 spreads all over the full week of sealing-in end face 6 and forms.Then, the surface of this outside chamfered section 8 is used as first matsurface 11, and its concavo-convex mean depth Rz is 5 μ m≤Rz≤30 μ m, and its concavo-convex Sm average period is 100 μ m≤Sm≤400 μ m.In addition, for this first matsurface 11, preferably its concavo-convex mean depth Rz is 10 μ m≤Rz≤20 μ m, and its concavo-convex Sm average period is 160 μ m≤Sm≤350 μ m.

As shown in Figure 2, in this embodiment, outside chamfered section 8 be connected to as a lateral margin 6a from sealing-in end face 6 marginal portion 5 lateral surface 10 a lateral margin 10a inclined plane (C face) and form, be formed at simultaneously on 1/50～1/5 the zone of face width S of sealing-in end face 6.

And then, with the lateral surface 10 of outside chamfered section 8 consecutive marginal portions 5 on, be formed with its continuous part at least lip-deep concavo-convex mean depth Rz and average period Sm and above-mentioned first matsurface 11 be in second matsurface 12 in the same number range.This second matsurface 12 also can be formed up to from the marginal portion outside chamfered section 8 (a lateral margin 10a) of 5 lateral surface 10 and leave the position about 3～10mm, but is preferably formed as in until till dotted line (break line) B or till spue line (the mold match line) M or on the scope till the centre position between the B, M two lines.

In addition, first matsurface 11 is formed at the regulation zone that comprises diagonal axis DA of outside chamfered section 8, for example be formed at from diagonal axis DA on the zone below the above 100mm of 5mm of vertical (length direction) central portion side of each limit portion 4, best second matsurface 12 also is formed on the identical therewith zone.In addition, first matsurface 11 also can be formed at vertical central portion of the limit portion 4 of the outside in the chamfered section 8, for example except from diagonal axis DA on the zone of vertical central portion of the limit portion 4 the zone below the above 100mm of the 5mm of vertical central portion side of each limit portion 4.But, in this case, preferably only form first matsurface 11 on the long leg 4 in each limit portion 4, or so that long leg 4 forms first matsurface 11 than the mode that short leg 4 has longer size.And then, for the surface of sealing-in end face 6, also can be used as its concavo-convex mean depth Rz and average period Sm and first matsurface 11 be in matsurface in the same number range.

On the other hand, this screen board 1 also forms inboard chamfered section (edge portion) 7 on the cross part of the medial surface 9 of marginal portion 5 and sealing-in end face 6, and this inboard chamfered section 7 also spreads all over the full week of sealing-in end face 6 and forms.Then, the surface of this inboard chamfered section 7 is used as the 3rd matsurface 13, the mean depth Rz that it is concavo-convex and average period Sm and first matsurface 11 be in the same number range.In addition, with the medial surface 9 of these inboard chamfered section 7 consecutive marginal portions 5 on be formed with the 4th matsurface 14, at least the lip-deep concavo-convex mean depth Rz of its consecutive part and average period Sm and first matsurface 11 be in the same scope.

As shown in Figure 3, according to screen board 1 with above formation, the outside chamfered section 8 of the both sides of the sealing-in end face 6 of screen board 1 and the surface of inboard chamfered section 7 are used as first matsurface 11 and the 3rd matsurface 13 respectively, thus, when carrying out sealing-in via 30 pairs of screen boards 1 of melten glass and funnel 20, once just can fully suppress to swarm melten glass 30 sagging the flowing of coming, make the melten glass 30 after the curing can not become the state that hangs down unusually, thereby obtain good sealing-in shape along two chamfered section 7,8.Make with the lateral surface 10 of two chamfered section, 7,8 consecutive marginal portions 5 and the surface of medial surface 9 and be used as second matsurface 12 and the 4th matsurface 14 respectively, this advantage just can obtain more significantly thus.

In addition, particularly because the surface of outside chamfered section 8 is used as first matsurface 11, on outside chamfered section 8, be difficult to produce through and through wound (broad ways runs through the scar of chamfered section), the probability of happening of the so-called triangle breakage in the time of just being reduced in the heat treatment in the sealing-in operation with funnel 20 thus etc.The condition that obtains such advantage is, is formed with first matsurface 11 on the regulation zone that comprises diagonal axis DA of outside chamfered section 8.

And then, because being formed at first matsurface 11 and second matsurface 12 of two chamfered section 7,8 is in the above-mentioned number range, so the dirt that is attached to two chamfered section 7,8 in the manufacturing process of screen board 1 is come off, thereby can avoid making under the state of in the recess of two matsurfaces 11,12 still residual dirt etc. the situation of glass-vacuum tube 40.Thus, this glass-vacuum tube 40 is being applied under the situation of cathode ray tube, just can preventing to concentrate the situation of the breakage of attracting cathode ray tube because of generation electric fields such as dirts.

Embodiment

Shown in the table 1 described as follows like that, as embodiments of the invention 1, for these two surface of first matsurface 11 of the outside chamfered section 8 of screen board 1 and inboard chamfered section 7 and the 3rd matsurface 13, being made into its concavo-convex case depth Rz is that 5 μ m and surface period Sm are 100 μ m, as embodiment 2, similarly producing Rz is that 10 μ m and Sm are the screen board 1 of 160 μ m, as embodiment 3, similarly producing Rz is that 15 μ m and Sm are the screen board 1 of 250 μ m, as embodiment 4, similarly producing Rz is that 20 μ m and Sm are the screen board 1 of 350 μ m, and as embodiment 5, similarly producing Rz is that 30 μ m and Sm are the screen board 1 of 400 μ m.

On the other hand, shown in the table 2 described as follows like that, as a comparative example 1, similarly making Rz with above-mentioned occasion is that 3 μ m and Sm are the screen board 1 of 90 μ m, as a comparative example 2, similarly producing Rz is that 3 μ m and Sm are the screen board 1 of 160 μ m, as a comparative example 3, similarly producing Rz is that 15 μ m and Sm are the screen board 1 of 90 μ m, as a comparative example 4, similarly producing Rz is that 40 μ m and Sm are the screen board 1 of 250 μ m, as a comparative example 5, and similarly producing Rz is that 40 μ m and Sm are the screen board 1 of 450 μ m.

Here, in any example in the foregoing description 1～5 and comparative example 1～5, the two all spreads all over outside chamfered section 8 and inboard chamfered section 7 full week and is formed on 1/8 the zone of face width S of sealing-in end face 6.In addition, these screen board 1 following making: its aspect ratio is 4: 3, the external diameter of diagonal axis directions X is 724.8mm, the radius of curvature of the outer surface of the fluorescent screen part 2 on the diagonal axis is 100000mm, screen board whole height (size of the tubular axis parallel direction from fluorescent screen part outer surface to the sealing-in end face) is 100.0mm, and the face width S of sealing-in end face 6 is 11.4mm.

Next, make and these screen board 1 corresponding funnels 20, simultaneously these funnels 20 are arranged on the anchor clamps of regulation, coating is by making melten glass 30 (Asahi Corp. KK's whistle system of sneaking on the sealing-in end face 26 of this funnel 20, ASF-1307B) be scattered in the slip (slurry) that organic media (vehicle) forms, and after making it drying, the screen board 1 of difference mounting embodiment 1～5 and comparative example 1～5 on its end face.After this, they are sent into heat-treatment furnace, this heat-treatment furnace has the set point of temperature gradients that kept with 450 ℃ of maximum temperatures 20 minutes, reacts by making the melten glass 30 and the sealing-in end face 6,26 of screen board 1 and funnel 20, and obtains the vacuum tube 40 that formed by each screen board 1 and each funnel 20 sealing-in.

In this case, execution will make screen board 1 mounting each glass-vacuum tube 40 on each funnel 20 of embodiment 1～5 and comparative example 1～5 via melten glass 30, respectively with 20 be unit by the operation of heat-treatment furnace with the involution melten glass, and with estimate observe thus the triangle that takes place damaged or with the degree size of its approximate breakage.Its result is shown in respectively in the fourth line of following table 1 and table 2 as three grades of evaluations.Zero mark in these three grades of evaluations means does not only have the situation that triangle is damaged even small defective did not also once all take place; Though it is damaged but the situation of small defective took place once at least that the △ mark represents not take place triangle, * mark represent to take place at least triangle damaged or with the situation of its approximate breakage.

In addition, each glass-vacuum tube that has carried out sealing-in about screen board 1 and each funnel 20 that makes embodiment 1～5 and comparative example 1～5 via melten glass 30 is observed the quality of the sealing-in shape (shape around the melten glass) after the heat treatment with range estimation.Its result is shown in respectively in the fifth line of following table 1 and table 2 as three grades of evaluations.Zero mark in these three grades of evaluations means the situation of sealing-in shape near ideal form; , the △ mark do not have dangerous situations such as breakage though representing between sealing-in shape and the ideal form certain difference to be arranged; To such an extent as to * mark is represented the very big situation that has danger such as breakage of difference between sealing-in shape and the ideal form.

And then, be used as under the situation of cathode ray tube at each glass-vacuum tube that will resultingly as described above have the screen board 1 of embodiment 1～5 and comparative example 1～5, to whether stably obtaining electric insulating quality, promptly whether the dirt around the sealing-in end face 6 of screen board 1 is eliminated and checks.Its result is shown in respectively in the 6th row of following table 1 and table 2 as three grades of evaluations.Zero mark in these three grades of evaluations means that thereby not producing electric field in dirt portion concentrates the situation that primary insulation destruction was not taken place; The situation of the crackle that causes took place once to concentrate because of the electric field in the dirt portion at least though the △ mark is represented insulation breakdown did not take place, and * mark represents that concentrating the crackle that causes because of the electric field in the dirt portion was once once extending to the situation that the insulation breakdown degree takes place.

Table 1

	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Embodiment 5
						?Rz(μm)	????5	????10	????15	????20	????30
?Sm(μm)	????100	????160	????250	????350	????400
						The triangle breakage	????○	????○	????○	????○	????○
The sealing-in shape	????△	????○	????○	????○	????△
						Electric insulating quality	????○	????○	????○	????○	????○

Table 2

	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4	Comparative example 5
						?Rz(μm)	????3	????3	????15	????40	????40
?Sm(μm)	????90	????160	????90	????250	????450
						The triangle breakage	????×	????×	????○	????○	????△
The sealing-in shape	????△	????×	????○	????○	????△
						Electric insulating quality	????△	????○	????×	????×	????×

According to table 1, use the screen board 1 of embodiment 1～5, just form first matsurface 11 on surface of outside chamfered section 8 and inboard chamfered section 7 and the screen board 1 in the number range that the 3rd matsurface 13 is in 5 μ m≤Rz≤30 μ m and 100 μ m≤Sm≤400 μ m and the glass-vacuum tube 40 produced, exist on the damaged and electric insulating quality of triangle well and the sealing-in situation of a bit deficient in shape, but no show still produces the degree of faults such as breakage, all is confirmed as the good glass-vacuum tube of quality 40 thus.

In addition, use the screen board 1 of embodiment 2～4, just form first matsurface 11 on surface of outside chamfered section 8 and inboard chamfered section 7 and the screen board 1 in the number range that the 3rd matsurface 13 is in 10 μ m≤Rz≤20 μ m and 160 μ m≤Sm≤350 μ m and the glass-vacuum tube 40 produced, all good on triangle breakage, electric insulating quality and these three elements of sealing-in shape, all be confirmed as the very good glass-vacuum tube of quality 40 thus.

On the other hand, according to above-mentioned table 2, use the screen board 1 of comparative example 1～5, just form first matsurface 11 on surface of outside chamfered section 8 and inboard chamfered section 7 and the screen board 1 in the number range that the 3rd matsurface 13 is in 5 μ m≤Rz≤30 μ m and 100 μ m≤Sm≤400 μ m and the glass-vacuum tube 40 produced, inferior for a certain key element in its triangle breakage of whole comparative examples, sealing-in shape and the electric insulating quality to out of use degree, all be confirmed as doing the discarded glass-vacuum tube of handling 40 thus.

Claims (8)

1. glass screen for cathode-ray tube, adopt following structure, promptly has roughly rectangular fluorescent screen part and by compound R part of the fluorescent screen periphery that constitutes arc-shaped surface by some different curvature radius and the marginal portion that is connected with fluorescent screen part approximate vertical, wherein, it is each limit portion of boundary that above-mentioned marginal portion has with the diagonal axis, and have the sealing-in end face at its openend, it is characterized in that:

Form outside chamfered section at the lateral surface of above-mentioned marginal portion and the cross part of sealing-in end face, and the surface of above-mentioned outside chamfered section is roughness, the mean depth Rz that it is concavo-convex and the satisfied respectively 5 μ m≤Rz of Sm average period≤30 μ m, 100 μ m≤Sm≤400 μ m, chamfered section surface, the above-mentioned outside is called first matsurface.

2. glass screen for cathode-ray tube as claimed in claim 1 is characterized in that: comprise forming above-mentioned first matsurface in the regulation zone of diagonal axis in the chamfered section of the above-mentioned outside.

3. glass screen for cathode-ray tube as claimed in claim 1 is characterized in that: the above-mentioned outside chamfered section that is positioned at the central part on long limit forms first matsurface.

4. as any described glass screen for cathode-ray tube in the claim 1～3, it is characterized in that: the marginal portion lateral surface that is connected on surface with the above-mentioned outside chamfered section that is defined as first matsurface, at least form on its continuous part concavo-convex mean depth Rz and average period Sm and above-mentioned first matsurface be that chamfered section in the identical number range forms second matsurface.

5. glass screen for cathode-ray tube, adopt following structure, promptly has roughly rectangular fluorescent screen part and by compound R part of the fluorescent screen periphery that constitutes arc-shaped surface by some different curvature radius and the marginal portion that is connected with fluorescent screen part approximate vertical, wherein, it is each limit portion of boundary that above-mentioned marginal portion has with the diagonal axis, and have the sealing-in end face at its openend, it is characterized in that:

Form inboard chamfered section at the medial surface of above-mentioned marginal portion and the cross part of sealing-in end face, and the surface of above-mentioned inboard chamfered section is roughness, its concavo-convex mean depth Rz and the satisfied respectively 5 μ m≤Rz of Sm average period≤30 μ m, 100 μ m≤Sm≤400 μ m, above-mentioned inboard chamfered section surface is called the 3rd matsurface.

6. glass screen for cathode-ray tube as claimed in claim 5 is characterized in that: comprise forming above-mentioned the 3rd matsurface in the regulation zone of diagonal axis in above-mentioned inboard chamfered section.

7. glass screen for cathode-ray tube as claimed in claim 5 is characterized in that: the above-mentioned inboard chamfered section that is positioned at the central part on long limit forms the 3rd matsurface.

8. as any described glass screen for cathode-ray tube in the claim 5～7, it is characterized in that: the marginal portion medial surface that is connected on surface with the above-mentioned inboard chamfered section that is defined as the 3rd matsurface, at least form on its continuous part concavo-convex mean depth Rz and average period Sm and above-mentioned the 3rd matsurface be that chamfered section in the identical number range forms the 4th matsurface.

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