CN1266729C - Glass cone for projection tube - Google Patents
Glass cone for projection tube Download PDFInfo
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- CN1266729C CN1266729C CN 200410062724 CN200410062724A CN1266729C CN 1266729 C CN1266729 C CN 1266729C CN 200410062724 CN200410062724 CN 200410062724 CN 200410062724 A CN200410062724 A CN 200410062724A CN 1266729 C CN1266729 C CN 1266729C
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- side wall
- face
- wall portion
- glass
- projection tube
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Abstract
The present invention relates to a glass cone for a projection CRT, which belongs to the field of a display device. A fixed seat of the present invention, which is used for fixing a cooling device, is integrally and convexly arranged on the outer side wall face of a side wall part of approximately funnel-shaped glass cone for the projection CRT. Thus, a convex ridge line forming the datum end face of the fixed seat comprises a first curve part, a second curve part and a straight line part, wherein the first curve part and the second curve part are connected smoothly by the straight line part, and the straight line part is smoothly connected to the outer wall face of the side wall part of the approximately funnel-shaped glass cone through the second curve part. The side wall part of the fixed seat is formed by the stretch of the convex ridge line which forms the datum end face along the direction of a central axis of the approximately funnel-shaped glass cone with an angle. Meanwhile, the datum end face and the side wall part of the fixed seat are respectively and smoothly connected with the outer side wall face of the glass cone for the projection CRT. The structural shape of the fixed seat for positioning the cooling device is effectively improved, and the molding characteristic and the pattern withdrawing characteristic are improved. Thus, the defects of generating insufficient filling of glass, the scratching of the side wall part of the fixed seat, small cracks, etc. can be prevented from generating.
Description
Technical field
The present invention relates to a kind of projection tube and bore with the funnel-form glass, its holder that is used for fixing cooling device is to be arranged on projectedly integratedly on the outer side surface of about funnel-form projection tube with the side wall portion of glass awl.
Background technology
Cathode ray tube as the critical piece that constitutes picture reproducer such as television set generally has direct viewing type cathode ray tube and projection cathode ray tube.All include in the building block of these two kinds of cathode ray tubes and have funnelform glass awl, this glass awl is used for installing electron gun.
In display frame, arrange RGB ternary coloured light with respect to the utilization of direct viewing type cathode ray tube and come displayed image, projection then is to utilize three cathode ray tubes to irradiate RGB coloured light respectively with cathode ray tube, and then RGB coloured light is enlarged be projected to displayed image on the fluorescent screen respectively., project on the fluorescent screen with in the cathode ray tube in this projection, so requirement has display characteristics such as higher brightness and fineness than direct viewing type cathode ray tube because the light of the image frame that must will show enlarges.Therefore, projection presents the very high temperature state with the fluorescent display screen portion of cathode ray tube, so generally will cooling device be installed at its surperficial sidepiece.This cooling device must correctly be configured to fluorescent screen position separated by a distance on, so on the side wall portion of funnelform projection tube, the holder that is used for fixing cooling device must be set with the glass awl, this holder is to be arranged on integratedly on the outside wall surface of side wall portion of funnel-form glass awl, is formed by mould molding together with funnel-form glass awl.Holder has the end face with funnel-form glass awl central axis approximate vertical, and this end face is to be used for the datum end face of positioning and cooling device.In addition, holder has side wall surface, and this side wall surface extends to from datum end face along the big open side of funnel-form glass awl on the outside wall surface of side wall portion of funnel-form glass awl.
The number of patent application declared in China of Japan NEG is 02158157.6 projection tube with the feature of glass awl is second bend that the protrusion crest line that forms the datum end face of holder comprises first bend that constitutes the top and formation riser portions, first bend can not be connected by deflection division smoothly with second bend, and second bend can not be connected to by deflection division on the outside wall surface of projection tube with the side wall portion of glass awl smoothly.
In with the technology that has, because the desired condition of said fixing seat only is that requirement can come location and installation cooling device correctly from datum end face, so have only the flatness of datum end face to be limited, and the joint face shapes of the side wall surface of the shape of datum end face, holder and holder and funnel-form glass awl side wall portion outside wall surface etc. are not concerned about especially.Because the molding mode of this projection tube usefulness funnel-form glass awl and characteristics are as can be known, if the radius of curvature that is connected curved surface between the side wall portion outside wall surface of the side wall surface of holder and funnel-form glass awl is too little, then the draft angle of the side wall portion of holder is also just little, therefore funnel-form glass awl is when compression moulding, the glass gob of fusion just is difficult to be filled into fully equably the die cavity corresponding to the holder of mould, certainly will cause defectives such as lack of fill or fold.In addition, funnel-form glass awl is extracted the difficulty that also can become from mould, can produce defectives such as scratch or fine cracks on the side wall surface of holder.To address the above problem from condition of molding, must or reduce mold temperature and improve withdrawing pattern at the holder position of corresponding mould overbrushing lubricating oil, but, if it is too many to be coated with lubricating oil, will produce defectives such as greasy dirt or wrinkle,, keep the best forming temperature of mould very difficult again because the temperature of mould is extremely important, even the temperature of mould is reduced a little, cause the generation of moulding crack defect possibly.So improve the processing range of forming defect from the direction of condition of molding very narrow, and need a large amount of time and efforts, also need the moulding personnel that good experience and skilled operation degree are arranged simultaneously.
For this reason, by design with make and a kind ofly can improve shaping characteristic, there is the projection tube that can satisfy functional requirement just to become the key of dealing with problems with the holder that is used for positioning and cooling device of glass awl.
Summary of the invention
The purpose of this invention is to provide a kind of projection bores with glass, except improveing effectively the planform of the holder that is used for positioning and cooling device, shaping characteristic and withdrawing pattern have also been improved, with defectives such as the scratch of avoiding producing glass lack of fill, holder sidewall portion and fine cracks.
To achieve these goals, the invention provides a kind of projection tube bores with glass, it has a plurality of holders that are used for fixing a cooling device, each holder protrudes integratedly respectively and is arranged on one one end and is roughly the big opening of rectangle, the other end is on the outside wall surface of funnel projection tube with the side wall portion of glass awl of circular little opening, it is characterized in that: the close described funnel projection tube of described holder is a datum end face with the end face of the circular little openend of glass awl, the protrusion crest line of this datum end face is by first curve part, second curve part and line part constitute, wherein first curve part and second curve part are by a line part smooth connection, and line part is connected on the outer side surface of funnel-form projection tube with the side wall portion of glass awl smoothly by second curve part; The central axial direction that the side wall portion of described holder is bored along the funnel-form glass by the protrusion crest line that forms datum end face stretches at angle and forms, the outer side surface smooth connection that the datum end face of described holder of while and side wall portion are bored with glass by curved surface and described projection tube respectively.
The protrusion crest line that the invention is characterized in the datum end face 10 of described holder is made of a plurality of curve parts and a plurality of line part.Constitute line part 2,2 ' and second curve part 3 smooth connections of first curve part 1 by tilting of the protrusion crest line of described holder datum end face 10, line part 2,2 ' gets up by second curve part 3 and the side wall surface smooth connection of glass awl again, shortened the mobile distance of glass feed liquid like this at this place, improved the flow direction of glass feed liquid, make the mobile of glass feed liquid further improve, avoided defectives such as glass feed liquid lack of fill to greatest extent.In addition because the line part that tilts 2,2 ' existence, the side wall portion of having avoided described holder when the demoulding because rocking in the horizontal direction causes abrading or generation of defects such as fine crack.
Description of drawings
Fig. 1 is the stereogram of projection tube with the glass awl.
Fig. 2 bores holder schematic diagram with the projection tube of glass awl central axial direction with glass along about funnel-form projection tube.
Fig. 3 be along by about funnel-form projection tube with glass awl central axis with form the normal direction of imaginary plane on the summit of first curve part of holder datum end face, also promptly in Fig. 2 the A direction see that projection tube in the past bores the schematic diagram of holder with glass.
Fig. 4 is the first side wall portion vertical direction that is made of first curve part against holder, also promptly in Fig. 2 the B direction see the schematic diagram of projection tube in the past with the holder of glass awl.
Fig. 5 is the vertical section front schematic view of the projection of the embodiment of the invention with glass awl and this glass cone mould.
Embodiment
Describe the present invention with reference to the accompanying drawings.
Fig. 1 is the stereogram of projection tube with the glass awl.Fig. 2 bores holder schematic diagram with the projection tube of glass awl central axial direction with glass along about funnel-form projection tube.Referring to Fig. 1 and Fig. 2, it has a plurality of holders that are used for fixing a cooling device, each holder protrudes integratedly respectively and is arranged on one one end and is roughly the big opening of rectangle, the other end is on the outside wall surface of roughly funnel projection tube with the side wall portion of glass awl of circular little opening, the close described roughly funnel projection tube of described holder is a datum end face 10 with the end face of the circular little openend of glass awl, the protrusion crest line of this datum end face 10 is by first curve part 1, second curve part 3 and line part 2,2 ' constitutes, wherein first curve part 1 and second curve part 3 are by a line part 2 or 2 ' smooth connection, and line part 2 or 2 ' is connected on the outer side surface of about funnel-form projection tube with the side wall portion of glass awl smoothly by second curve part 3; The first side wall portion 4, second side wall portion 5 and the 3rd side wall portion 6 of described holder stretched at angle along the central axial direction of about funnel-form glass awl by first curve part 1 of the protrusion crest line that forms datum end face 10, line part 2,2 ' and second curve part 3 respectively and forms, simultaneously the datum end face of described holder and each side wall portion respectively with the outer side surface smooth connection of described projection tube with the glass awl.At this, so-called " the protrusion crest line of datum end face " expression forms the outline line part of outline line protrusion outside about funnel-form glass awl outside wall surface of datum end face with respect to about funnel-form glass awl outside wall surface.To be 02158157.6 projection tube be with the difference of glass awl the number of patent application that the present invention and Japanese NEG declare in China, the protrusion crest line of the datum end face of holder of the present invention is by first curve part 1, second curve part 3 and line part 2,2 ' constitutes, wherein first curve part 1 and second curve part 3 are by a line part 2 or 2 ' smooth connection, line part 2 or 2 ' is connected on the outer side surface of about funnel-form projection tube with the side wall portion of glass awl smoothly by second curve part 3, the side wall portion of described holder is stretched at angle along the central axial direction of about funnel-form glass awl by the protrusion crest line that forms datum end face and forms, the datum end face of described holder part and the sidewall sections outer side surface smooth connection of boring with glass with described projection tube respectively simultaneously; And the number of patent application that Japanese NEG declares in China be 02158157.6 projection tube with the feature of glass awl is second bend that the protrusion crest line that forms the datum end face of holder comprises first bend that constitutes the top and formation riser portions, first bend can not be connected by deflection division smoothly with second bend, and second bend can not be connected to by deflection division on the outside wall surface of projection tube with the side wall portion of glass awl smoothly.Improvement by fixed seat structure described in the present invention, under the condition of identical function size, reduce the volume of holder, improved ess-strain distribution and the shaping characteristic and the withdrawing pattern at described position, avoided generation of defects such as the filling in described holder zone is incomplete.
In most preferred embodiment of the present invention, the protrusion crest line of the datum end face 10 of described holder is made of a plurality of curve parts and a plurality of line part.Constitute line part 2,2 ' and second curve part 3 smooth connections of first curve part 1 by tilting of the protrusion crest line of described holder datum end face 10, line part 2,2 ' gets up by second curve part 3 and the side wall surface smooth connection of glass awl again, shortened the mobile distance of glass feed liquid like this at this place, improved the flow direction of glass feed liquid, make the mobile of glass feed liquid further improve, avoided defectives such as glass feed liquid lack of fill to greatest extent.In addition because the line part that tilts 2,2 ' existence, the side wall portion of having avoided described holder when the demoulding because rocking in the horizontal direction causes abrading or generation of defects such as fine crack.
According to the present invention, first curve part 1 of the protrusion crest line of described holder datum end face 10 is a circular arc, and the radius of curvature value of this circular arc is (comprising 2mm) more than the 2mm and (comprise 20mm) below 20mm, with reference to figure 2.Be circular arc because constitute first curve part 1 at the top of the protrusion crest line of described holder datum end face 10, for other curved shape, the existence of circular arc for mold design and later maintenance etc. all than being easier to.If the radius of curvature of this circular arc during less than 2mm, can't be avoided when extrusion forming, the glass feed liquid is to the lack of fill at described holder top, and since the bending at described top exist and can't avoid the mobile generation of glass is hindered.On the contrary, if the radius of curvature of this circular arc greater than 20mm, it is bigger that the volume potential of described holder must become, the expanded range that sidewall is thicker, this makes that after extrusion forming the cooling meeting of described holder is more insufficient than other parts, is easy to produce distortion and scratch.Can to make that this regional ess-strain distributes and becomes inhomogeneous owing to the reason of this regional wall thickness and temperature in addition, the danger that is easy to break.Therefore, if the radius of curvature of this circular arc is set in the above-mentioned scope, can avoid above-mentioned generation of defects effectively.
According to the present invention, form the straightway of line part 2 and 2 ' for tilting of the protrusion crest line of described holder datum end face 10, with reference to figure 2, the protrusion crest line cathetus portion that constitutes described holder datum end face 10 by about the rectilinear(-al) of two sections inclinations, the tilt angle theta 1 of the long axis direction that they are bored with respect to described about funnel-form glass respectively and the span of θ 2 are respectively: 2≤87.8 ° of 1≤60 ° of 0 °≤θ and 60 °≤θ.If the angle of inclination of line part 2 and 2 ' not in this scope, can cause described holder amesiality, be distorted with crooked, be unfavorable for compression moulding, be easy to produce defectives such as scratch simultaneously.
According to the present invention, second curve part 3 that forms the protrusion crest line of described holder datum end face 10 is a circular arc, and the radius of curvature value of this circular arc is (comprising 5mm) more than the 5mm and (comprise 500mm) below 500mm, with reference to figure 2.If the radius of curvature of this circular arc is less than 5mm, described holder can be in sharply precipitous mode excessively to the side wall surface of about funnel-form glass awl, causes the glass feed liquid to flow freely and defective such as lack of fill.On the contrary, if the radius of curvature of this circular arc is greater than 500mm, described holder can be in very mild mode excessively to the side wall surface of about funnel-form glass awl, spread apart along the side wall portion outside wall surface, make holder and about funnel-form glass awl side wall portion there is no much difference in appearance, and forming too much useless part on described holder, strengthened the volume of described holder, is disadvantageous for economical with materials.Therefore, the radius of curvature of second curve part is set in the above-mentioned scope, can avoids the generation of above-mentioned defective effectively.
According to the present invention, (comprising 2 °) more than 2 ° and (comprising 45 °) below 45 ° along stretch the at angle tilt angle alpha of the first side wall portion 4 of the described holder that forms of the central axial direction of about funnel-form glass awl by first curve part 1 of the protrusion crest line of the described datum end face 10 that constitutes holder; (comprising 2 °) more than 2 ° and below 90 ° by the line part 2 of the protrusion crest line of the described datum end face 10 that constitutes holder, 2 ' and second curve part 3 along stretch the at angle span of inclination angle beta of second side wall portion 5 of the described holder that forms and the 3rd side wall portion 6 of the central axial direction of about funnel-form glass awl, with reference to figure 2, Fig. 3, Fig. 4.If the angle of inclination of the first side wall portion 4 of described holder, that is the drafting angle of this side wall portion is less than 2 ° words, after extrusion forming, withdrawing pattern when about funnel-form glass awl is taken out from mould can worsen, on the side wall surface of holder, also can produce scratch or fine cracks etc., will reduce the quality of product inevitably.If this angle of inclination is greater than 45 °, holder and glass awl lateral wall portion there is no bigger difference in appearance, increase a lot of useless parts undoubtedly, strengthened the volume of holder, wasted material, simultaneously, the thickening of the wall thickness of this part makes structure and the temperature distributing disproportionation that this is regional, certainly will cause the skewness of ess-strain, take place broken danger, the useful life of reducing it easily.Therefore, the tilt angle alpha of the first side wall portion 4 of holder is controlled at (comprises 2 °) more than 2 ° and in the scope that (comprises 45 °) below 45 °, just can improve and avoid above-mentioned defective effectively.In like manner, second side wall portion 5 of described holder and the inclination angle beta of the 3rd side wall portion 6 also should control in its corresponding scope, also promptly (are comprising 2 °) more than 2 ° and below 90 °.
The first side wall portion 4, second side wall portion 5 and the 3rd side wall portion 6 according to holder of the present invention pass through a circular arc camber 7 smooth connections with described about funnel-form glass awl outer side surface, the value of the radius of curvature of this circular arc camber is (comprising 5mm) more than the 5mm and (comprise 500mm) below 500mm, with reference to figure 3.If the radius of curvature of this circular arc camber is less than 5mm, from the lateral wall portion of about funnel-form glass awl to the transitional processes of the side wall portion of described holder, the variation that the shape meeting is violent, thus when compression moulding, can't avoid the defective of glass feed liquid mobile obstacle or lack of fill to take place.On the contrary, if the radius of curvature of this circular arc camber is greater than 500mm, the side wall portion of described funnel-form glass awl can make the expanded range of the sidewall wall thickness thickening that this is regional because of the existence of holder, thereby make after compression moulding, the holder part can produce cooling not exclusively, certainly will cause this regional ess-strain skewness, broken danger very easily takes place.Therefore, if in the scope that the radius of curvature of this circular arc camber 7 is set in 5mm above (comprising 5mm) and (comprises 500mm) below 500mm, so not only guarantee structural smooth connection, and avoided stress to concentrate again, improved the shaping characteristic of described holder part.
The invention is characterized in described holder the first side wall portion 4 of datum end face 10 and described holder, second side wall portion 5 and the 3rd side wall portion 6 are by a circular arc camber 8 smooth connections, the value of the radius of curvature of this circular arc camber is (to comprise 2mm) more than the 2mm and (comprise 20mm) below 20mm, described holder datum end face 10 and described projection tube with the outer side surface of glass awl by a circular arc camber 9 smooth connections, the value of the radius of curvature of this circular arc camber is (comprising 2mm) more than the 2mm and (comprise 25mm) below 25mm, with reference to figure 3.Guarantee to have avoided the stress of corner to concentrate like this, guaranteed the dimensional requirement of described holder datum end face again.
The invention is characterized in described projection tube with cooling device must correctly be configured to fluorescent screen position separated by a distance on, reduce the temperature of this part, guarantee to have display characteristics such as higher brightness and fineness.Therefore height H (mm) and described projection tube that the described datum end face that is used for fixing the holder of cooling device is bored reference line to described projection tube with glass will satisfy 0.4R/L≤H＜R/L with the relation between the reference line height R/L (mm) of glass awl, with reference to figure 3.With the glass awl, described height H equals 30.2 ± 3.2 for best, i.e. H=30.2 ± 3.2 concerning 7 inches projection tubes.
The aforesaid projection tube that has the cooling device holder of the present invention is formed by mould molding with the glass awl, and with reference to Fig. 5, die set is made up of punch 1, die 2 and mould circle 3 three parts.Punch is used for the negative camber of the described glass awl of moulding, and die is used for the positive camber of the described glass awl of moulding, comprises the holder that is used for fixing cooling device, and the mould circle is used for the big opening portion that is roughly rectangle of the described glass awl of moulding.The molding mode of glass awl is: the glass solution of fusion splashes into by die with the form of gob, in the open containers that the mould circle constitutes, punch descends with certain speed then, remove the glass gob in the Extruding die, along with punch constantly descends, glass gob constantly flows to the direction of mould circle along 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, during pressurize, the cooling system of punch inside, the cooling duct of die outside and low ambient temperature cool off described glass awl together, be frozen into described glass awl up to glass gob, so complete described glass awl finishes with regard to moulding.In addition owing to glass is bored in forming process, very big distortion has taken place and has crossed over the huge temperature difference in the glass gob that constitutes described glass awl, exist bigger thermal stress and distortional stress in the described glass awl, so after moulding is finished, still need described glass awl is carried out the stress relief annealing operation.
Claims (10)
1. a projection tube is bored with glass, it has a plurality of holders that are used for fixing a cooling device, each holder protrudes integratedly respectively and is arranged on one one end and is roughly the big opening of rectangle, the other end is on the outside wall surface of funnel projection tube with the side wall portion of glass awl of circular little opening, it is characterized in that: the close described funnel projection tube of described holder is a datum end face with the end face of the circular little openend of glass awl, the protrusion crest line of this datum end face is by first curve part, second curve part and line part constitute, wherein first curve part and second curve part are by described line part smooth connection, and described line part is connected on the outer side surface of funnel-form projection tube with the side wall portion of glass awl smoothly by second curve part; The central axial direction that the side wall portion of described holder is bored along the funnel-form glass by the protrusion crest line that forms datum end face stretches at angle and forms, the described outer side surface smooth connection that the datum end face of described holder of while and side wall portion are bored with glass by curved surface and described projection tube respectively.
2. bore with glass according to the described projection tube of claim 1, it is characterized in that: the protrusion crest line of the datum end face of described holder is made of a plurality of curve parts and a plurality of line part.
3. bore with glass according to the described projection tube of claim 1, it is characterized in that: forming described first curve part that described holder datum end face protrudes crest line is a circular arc, and the radius of curvature value of this circular arc is more than or equal to 2mm and be less than or equal between the 20mm.
4. bore with glass according to the described projection tube of claim 1, it is characterized in that: forming described second curve part that described holder datum end face protrudes crest line is a circular arc, and the radius of curvature value of this circular arc is more than or equal to 5mm and be less than or equal between the 500mm.
5. bore with glass according to the described projection tube of claim 1, it is characterized in that: the first side wall portion of described holder is stretched by the central axial direction that described first curve part of the protrusion crest line that constitutes described holder datum end face is bored along the funnel-form glass to form at angle, the angle that this draw direction had is exactly the angle of inclination (α) of the first side wall portion of described holder, and this angle (α) is more than or equal to 2 ° and be less than or equal to 45 ° of scope values; Second side wall portion of described holder and the 3rd side wall portion are to be stretched at angle by the central axial direction that the line part of the protrusion crest line that constitutes described holder datum end face and second curve part are bored along the funnel-form glass respectively to form, the angle that this draw direction had is exactly the angle of inclination (β) of second side wall portion and the 3rd side wall portion of described holder, and this angle (β) is more than or equal to 2 ° and be less than or equal to 90 ° of scope values.
6. bore with glass according to the described projection tube of claim 1, it is characterized in that: the line part that constitutes the protrusion crest line of described holder datum end face with respect to the tilt angle theta 1 of the long axis direction of described funnel-form glass awl and the span of θ 2 is respectively: 2≤87.8 ° of 1≤60 ° of 0 °≤θ and 60 °≤θ, and θ 1＜θ 2.
7. bore with glass according to the described projection tube of claim 1, it is characterized in that: the first side wall portion of described holder, second side wall portion and the 3rd side wall portion and described funnel-form glass awl outer side surface is by a circular arc camber smooth connection, and the value of the radius of curvature of this circular arc camber is more than or equal to 5mm and be less than or equal between the 500mm.
8. bore with glass according to the described projection tube of claim 1, it is characterized in that: the first side wall portion, second side wall portion and the 3rd side wall portion of the datum end face of described holder part and described holder be by a circular arc camber smooth connection, and the value of the radius of curvature of this circular arc camber is more than or equal to 2mm and be less than or equal between the 20mm.
9. bore with glass according to the described projection tube of claim 1, it is characterized in that: by a circular arc camber smooth connection, the value of the radius of curvature of this circular arc camber is more than or equal to 2mm and be less than or equal between the 25mm with the outer side surface of glass awl for the datum end face of described holder part and described projection tube.
10. bore with glass according to the described projection tube of claim 1, it is characterized in that: height H and described projection tube that the described datum end face that is used for fixing the holder of cooling device is bored reference line to described projection tube with glass will satisfy 0.4R/L≤H＜R/L with the relation between the reference line height R/L of glass awl.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410062724 CN1266729C (en) | 2004-07-07 | 2004-07-07 | Glass cone for projection tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410062724 CN1266729C (en) | 2004-07-07 | 2004-07-07 | Glass cone for projection tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588610A CN1588610A (en) | 2005-03-02 |
| CN1266729C true CN1266729C (en) | 2006-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410062724 Expired - Fee Related CN1266729C (en) | 2004-07-07 | 2004-07-07 | Glass cone for projection tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1266729C (en) |
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2004
- 2004-07-07 CN CN 200410062724 patent/CN1266729C/en not_active Expired - Fee Related
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| CN1588610A (en) | 2005-03-02 |
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