CN1121055C - Method for mfg. shadow mask of colour CRT and its structure - Google Patents
Method for mfg. shadow mask of colour CRT and its structure Download PDFInfo
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- CN1121055C CN1121055C CN 99123739 CN99123739A CN1121055C CN 1121055 C CN1121055 C CN 1121055C CN 99123739 CN99123739 CN 99123739 CN 99123739 A CN99123739 A CN 99123739A CN 1121055 C CN1121055 C CN 1121055C
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- shadow mask
- focal
- aperture
- center
- apertures
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Abstract
The present invention relates to a method for manufacturing a shadow mask of a color cathode-ray tube and a structure thereof. In the method, a plurality of focusing holes in an equidistant or an approximate equidistant arrangement are arranged on a flat plate of the shadow mask of the color cathode-ray tube, wherein the focusing holes in the center of the flat plate of the shadow mask present a circular shape and the rest focusing holes are designed one by one into an ellipse along a radiating direction from the center. The long axis of the elliptical focusing holes are just vertical to the shadow mask in a stress extending direction when the shadow mask is mechanically shaped so as to compensate for a telescopic effect due to the shaping of the focusing holes of the shadow mask through a mechanical spherical surface. Therefore, the elliptical focusing holes are changed to circular focusing holes when the shadow mask is shaped by the spherical surface so that fluorescent spots at the inner side of a display screen are accurately spread to corresponding positions.
Description
The present invention is about a kind of mask design of color cathode ray tube, especially finger is a kind of can be in color cathode ray tube manufacturing process, as a good exposure light shield, the fluorescent screen coating is carried out in the display screen inboard, phosphor dot is applied on the tram exactly, effectively improves the shadow mask manufacture method and the structure thereof of fluorescent screen coating quality.
In general conventional color cathode ray tube 10, consult shown in Figure 1, be positioned on the preset distance position of its display screen 14 inboards, be equipped with a shadow mask 26, this shadow mask 26 is to be made through mechanical sphere moulding by a high-tension metal plate, which is provided with a plurality of focal aperture 26a that are equidistant arrangement, the three-color electron beam 22 that these focal apertures 26a can make the electron gun 20 of color cathode ray tube 10 be produced just runs through wherein, be projected on the corresponding phosphor dot of laying these display screen 14 inboards 24, this shadow mask is equivalent to the negative electrode (color selection cathode) that selects of the same colour, mainly be to utilize these focal apertures 26a, the three-color electron beam 22 that the electron gun 20 of this color cathode ray tube 10 is produced can pass each this focal aperture 26a and be projected to exactly on the corresponding phosphor dot 24 of these display screen 14 inboards.
Consult shown in Figure 2, generally speaking, these shadow mask 26 peripheries in the conventional color cathode ray tube 10 are formed with a skirt section 44 (skirt), this skirt section 44 is fixed on the framework that is rectangle 52 by welding manner, the periphery of this framework 52 is more respectively by a metal setting element 48a, 48b, 48c and 48d, be fixed in glass encapsulating body 46 inboards of this color cathode ray tube, these setting elements 48a, 48b, the locate mode of 48c and 48d is by welding the one end to be fixed on the framework 52 of this shadow mask, its other end then respectively with the inboard correspondence position of this glass encapsulating body 46 on a set projection 50a, 50b, 50c or 50d connect and fix mutually, make this shadow mask 26 firmly be positioned the inboard correspondence position of this glass encapsulating body 46, and and 14 of the display screens of this color cathode ray tube 10 keep a fixing designed distance.
In aforementioned color cathode ray tube, utilize the chemical etching mode to etch the focal aperture of huge quantity earlier on this shadow mask flat board, the shape of each this focal aperture can be the long ditch shape (elongated and vertically aligned slots) or the circle of vertically arranging.In the present invention, be primarily aimed at shadow mask manufacture method and structure thereof, carry out design improved with circular focal aperture.
On the shadow mask of conventional color cathode ray tube, the focal aperture of this kind circular design is all in the mode of the center heart, be staggered arrangement, its aperture and spacing are general all less than 1mm, its effect is when color cathode ray tube carries out video picture scanning, the three-color electron beam that electron gun is produced passes wherein, be projected to exactly on the phosphor dot that each this focal aperture laid corresponding to this display screen inboard, so this shadow mask also can be used as the usefulness that the fluorescent screen coating is carried out in this display screen inboard.
In the manufacturing process of conventional color cathode ray tube, the fluorescent screen coating of this display screen inboard, it mainly is the mode of utilizing mechanical sphere moulding earlier, one shadow mask flat board 60 is made a curved surface shadow mask 63, consult Fig. 3 and shown in Figure 4, again with this curved surface shadow mask 63 as light shield, make a ultraviolet light (ultraviolet) light source, by each focal aperture on it, according to light chamber (lighthouse) principle, emulsion (photosensitive binder) contained in the fluorescence coating (phosphorescent) that is coated with on this display screen is carried out sensitization and induration, so that on inboard each correspondence position of this display screen, form phosphor dot.For the color cathode ray tube of dot type, when carrying out this kind exposure coating, it is circular whether each focal aperture on this shadow mask can keep, and will have a strong impact on the image display quality of color cathode ray tube, so when making its shadow mask, all each focal aperture 61 on this shadow mask flat board 60 is designed to circle.Consult shown in Figure 3.But, this shadow mask flat board 60 is in mechanical sphere forming process, consult shown in Figure 4 again, will be because of the effect of mechanical stress, make the shape stretcher strain ovalisation shape 64 of these circular focal apertures 61, its draw direction and this shadow mask center 62 become vertical angle along the direction of radial extension, if with the exposure light shield of the curved surface shadow mask 63 after this kind distortion as fluorescent screen, the inboard fluorescent screen of this display screen is carried out the exposure coating, and the inboard formed phosphor dot of this display screen will present elliptical shape equally.This kind elliptical shape is not only bad for fluorescent screen brightness and electron beam contraposition quality, and it is to the influence of large scale color cathode ray tube image quality, with even more serious.
The shadow mask manufacture method and the structure thereof that the purpose of this invention is to provide a kind of color cathode ray tube, when carrying out the exposure coating in its display screen inboard to overcome conventional color cathode ray tube, easily because of shadow mask in mechanical sphere forming process, the shape of its circular focal aperture is drawn into ellipse, has a strong impact on the defective of fluorescent screen coating quality.
The shadow mask manufacture method of color cathode ray tube of the present invention may further comprise the steps:
A), design a circular focal aperture at the center position of a shadow mask flat board;
B) in this center along on the radial outward extending direction design oval focal aperture, and make the major axis of these oval focal apertures identical with described radiation direction just, its minor axis is then vertical with described radiation direction, after this shadow mask was by the sphere moulding, these oval focal apertures all became the focal aperture that is close to circle.
Wherein the pore size of these oval focal apertures is to design according to level and vertical range between its position and this center.
The major axis of described oval focal aperture directly is the aperture based on the circular focal aperture that is positioned at this center, along described radiation direction, lengthening according to the level between its position and this center and vertical range and gradually, its short shaft diameter is then based on the aperture of this circle focal aperture, along perpendicular to described radiation direction, according to the level between its position and this center and vertical range and shortening gradually.
Wherein the pore size of these oval focal apertures can utilize following formula, is designed:
D
L＝D
0+A×X
2+B×Y
2+C×X
2×Y
2……… (1)
Ds=D
0-a * X
2-b * Y
2-c * X
2* Y
2(2) D wherein
LRepresent the major axis footpath of this focal aperture, Ds represents the short shaft diameter of this focal aperture, D
0Representative is positioned at the aperture of this shadow mask central circular focal aperture, and A, a, B, b, C and c represent constant, and X, Y represent the level and the vertical range at its position and the dull and stereotyped center of this shadow mask.
Wherein the direction that outwards is radial extension with the dull and stereotyped center of this shadow mask approximates the direction of vertical this shadow mask stressed elongation when mechanical molding.
The shade mask structure of color cathode ray tube of the present invention comprises: a metal plate, which is provided with a plurality of focal apertures that are equidistant arrangement, the focal aperture that wherein is positioned at this flat board center is rounded, all the other focal apertures then with this center along radial direction, be designed to ellipse one by one, the major axis of these oval focal apertures is just with identical along radial outward extending direction; This shadow mask flat board is after finishing the sphere moulding, and the minor axis of those oval focal apertures will be along direction be stressed be elongated perpendicular to radiation, and its major axis is then because of the effect of material stress, and shortens the length that becomes identical with this minor axis, forms and is close to circular focal aperture.
Wherein the major axis of these oval focal apertures directly is the aperture based on the circular focal aperture of this center, radiation direction along this center, lengthening according to the level between its position and this center and vertical range and gradually, its short shaft diameter is then based on the aperture of this circle focal aperture, along the radiation direction of this center, shorten gradually according to the level between its position and this center and vertical range.
Wherein the pore size of these oval focal apertures can utilize following formula, is designed:
D
L＝D
0+A×X
2+B×Y
2+C×X
2×Y
2……… (1)
Ds=D
0-a * X
2-b * Y
2-c * X
2* Y
2(2) D wherein
LRepresent the major axis footpath of this focal aperture, Ds represents the short shaft diameter of this focal aperture, D
0Representative is positioned at the aperture of this shadow mask central circular focal aperture, and A, a, B, b, C and c represent constant, and X, Y represent the level and the vertical range at its position and the dull and stereotyped center of this shadow mask.
The present invention is positioned at wherein on the shadow mask flat board with a dot type color cathode ray tube that the focal aperture of heart position is designed to circle, all the other focal apertures then with this center along the radial ellipse that outwards is designed to one by one, and the major axis of these oval focal apertures is just vertical with this shadow mask direction of stressed elongation when the mechanical molding, the flex effect that after mechanical sphere is shaped, is caused with the focal aperture that compensates this shadow mask, make these oval focal apertures after this shadow mask is by the sphere moulding, all become circular focal aperture, in the manufacturing process of color cathode ray tube, the shape of these focal apertures can make shadow mask of the present invention become good exposure light shield, the fluorescent screen coating is carried out in the display screen inboard, with the focal aperture of guaranteeing this shadow mask the phosphor dot of display screen inboard can be applied on the correspondence position exactly, effectively improve the coating quality, and specifically improve the brightness of fluorescent screen and the contraposition quality of electron beam.
Fig. 1 is the vertical section schematic diagram of conventional color cathode ray tube;
Fig. 2 is the front view that shadow mask is connected to the glass encapsulating body among Fig. 1;
Fig. 3 is the view of each focal aperture on the shadow mask flat board;
Fig. 4 is a shadow mask after mechanical sphere is shaped, the view of each focal aperture on it;
Fig. 5 is the view of each focal aperture on the shadow mask flat board of the present invention;
Fig. 6 is a shadow mask of the present invention after mechanical sphere is shaped, the view of each focal aperture on it.
In the present invention, consult shown in Figure 5, be positioned at that a set shadow mask is to be made by a high-tension metal plate 70 on the preset distance position of display screen inboard of color cathode ray tube, etching has a plurality of equidistant staggered oval focal apertures 71 that are on it.Because, this shadow mask flat board 70 in follow-up mechanical sphere forming process, will because of forming machine to the stress that it produced, the shape that makes these focal apertures 71 along perpendicular to this shadow mask center 72 outwards directions of radiation stretch, these focal apertures 71 are deformed.
At this kind situation, the focal aperture 71 that spy of the present invention will be positioned at 72 positions, dull and stereotyped 70 centers of this shadow mask is designed to circle, 71 of all the other focal apertures with this center 72 along the radial ellipse that outwards is designed to one by one, the major axis of these oval focal apertures is just vertical mutually with this shadow mask direction of stressed elongation when the mechanical molding, treat that this shadow mask flat board 70 is after finishing the sphere moulding, the minor axis of these oval focal apertures 71 will be elongated along the direction of its stressed stretching, its major axis then shortens the length that becomes identical with this minor axis because of the effect of material stress, the flex effect that after mechanical sphere is shaped, is caused with the focal aperture of effective this shadow mask of compensation, make these oval focal apertures 71 after this shadow mask is by the sphere moulding, all become the focal aperture 74 that is close to circle.
In a preferred embodiment of the present invention, be designed to the circle except that the focal aperture 71 that is positioned at 72 positions, dull and stereotyped 70 centers of this shadow mask on this shadow mask flat board 70, all the other each focal apertures 71 are along radial direction with this center 72, be designed to ellipse one by one, the pore size of these oval focal apertures 71, can utilize following formula (1) and (2) respectively according to the horizontal range X and the vertical range Y at its position and dull and stereotyped 70 centers 72 of this shadow mask, be designed:
D
L＝D
0+A×X
2+B×Y
2+C×X
2×Y
2……… (1)
Ds=D
0-a * X
2-b * Y
2-c * X
2* Y
2(2) D wherein
LRepresent the major axis footpath of this focal aperture 71, Ds represents the short shaft diameter of this focal aperture 71, D
0Representative is positioned at the aperture of the figure focal aperture 71 at this shadow mask center 72, and A, a, B, b, C and c represent constant.
Reach (2) as can be known by formula (1), the major axis of these focal apertures 71 footpath D
LBased on the aperture of the circular focal aperture 71 that is positioned at these 72 positions, center, the outside directions of radiation along this center 72 according to level and vertical range X, the Y at its position and this center 72, and extend gradually; The short shaft diameter Ds of these focal apertures 71 is then based on the aperture of the circular focal aperture 71 that is positioned at these 72 positions, center, the outside directions of radiation along this center 72, and according to level and vertical range X, the Y at its position and this center 72, and shortening gradually.In addition, because the major axis of these oval focal apertures is just perpendicular to the direction of this shadow mask stressed elongation when the mechanical molding, its minor axis is then identical with this shadow mask direction of stressed elongation when the mechanical molding, so at this shadow mask after mechanical sphere is shaped, the minor axis of these oval focal apertures 71 will be elongated along the direction of its stressed stretching, the then stress effect and shortening of its major axis, these oval focal apertures 71 are become be close to circular focal aperture, the flex effect that after mechanical sphere is shaped, is caused with the focal aperture of effective this shadow mask of compensation.
So, this shadow mask of the present invention promptly can be used as a good exposure light shield, the fluorescent screen coating is carried out in the display screen inboard, with the focal aperture of guaranteeing this shadow mask the inboard phosphor dot of display screen can be applied on the correspondence position exactly, effectively improve coating quality, brightness and the electron beam contraposition quality of fluorescent screen.
Claims (8)
1, a kind of shadow mask manufacture method of color cathode ray tube may further comprise the steps:
A), design a circular focal aperture at the center position of a shadow mask flat board;
B) in this center along on the radial outward extending direction design oval focal aperture, and make the major axis of these oval focal apertures identical with described radiation direction just, its minor axis is then vertical with described radiation direction, after this shadow mask was by the sphere moulding, these oval focal apertures all became the focal aperture that is close to circle.
2, the shadow mask manufacture method of a kind of color cathode ray tube as claimed in claim 1 is characterized in that: wherein the pore size of these oval focal apertures is to design according to level and vertical range between its position and this center.
3, the shadow mask manufacture method of a kind of color cathode ray tube as claimed in claim 1, it is characterized in that: the major axis of described oval focal aperture directly is the aperture based on the circular focal aperture that is positioned at this center, along described radiation direction, lengthening according to the level between its position and this center and vertical range and gradually, its short shaft diameter is then based on the aperture of this circle focal aperture, along perpendicular to described radiation direction, according to the level between its position and this center and vertical range and shortening gradually.
4, the shadow mask manufacture method of a kind of color cathode ray tube as claimed in claim 1 is characterized in that: the pore size of these oval focal apertures wherein, can utilize following formula, and designed:
D
L＝D
0+A×X
2+B×Y
2+C×X
2×Y
2……… (1)
Ds=D
0-a * X
2-b * Y
2-c * X
2* Y
2(2) D wherein
LRepresent the major axis footpath of this focal aperture, Ds represents the short shaft diameter of this focal aperture, D
0Representative is positioned at the aperture of this shadow mask central circular focal aperture, and A, a, B, b, C and c represent constant, and X, Y represent the level and the vertical range at its position and the dull and stereotyped center of this shadow mask.
5, as the shadow mask manufacture method of claim 1 or 2 or 3 or 4 described a kind of color cathode ray tubes, it is characterized in that: wherein the direction that outwards is radial extension with the dull and stereotyped center of this shadow mask approximates the direction of vertical this shadow mask stressed elongation when mechanical molding.
6, a kind of shade mask structure of color cathode ray tube, it is characterized in that: this shade mask structure comprises: a metal plate, which is provided with a plurality of focal apertures that are equidistant arrangement, the focal aperture that wherein is positioned at this flat board center is rounded, all the other focal apertures then with this center along radial direction, be designed to ellipse one by one, the major axis of these oval focal apertures is just with identical along radial outward extending direction; This shadow mask flat board is after finishing the sphere moulding, and the minor axis of those oval focal apertures will be along direction be stressed be elongated perpendicular to radiation, and its major axis is then because of the effect of material stress, and shortens the length that becomes identical with this minor axis, forms and is close to circular focal aperture.
7, the shade mask structure of a kind of color cathode ray tube as claimed in claim 6, it is characterized in that: wherein the major axis of these oval focal apertures directly is the aperture based on the circular focal aperture of this center, radiation direction along this center, lengthening according to the level between its position and this center and vertical range and gradually, its short shaft diameter is then based on the aperture of this circle focal aperture, along the radiation direction of this center, shorten gradually according to the level between its position and this center and vertical range.
8, the shade mask structure of a kind of color cathode ray tube as claimed in claim 6 is characterized in that: the pore size of these oval focal apertures wherein, can utilize following formula, and designed:
D
L＝D
0+A×X
2+B×Y
2+C×X
2×Y
2……… (1)
Ds=D
0-a * X
2-b * Y
2-c * X
2* Y
2(2) D wherein
LRepresent the major axis footpath of this focal aperture, Ds represents the short shaft diameter of this focal aperture, D
0Representative is positioned at the aperture of this shadow mask central circular focal aperture, and A, a, B, b, C and c represent constant, and X, Y represent the level and the vertical range at its position and the dull and stereotyped center of this shadow mask.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123739 CN1121055C (en) | 1999-11-18 | 1999-11-18 | Method for mfg. shadow mask of colour CRT and its structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123739 CN1121055C (en) | 1999-11-18 | 1999-11-18 | Method for mfg. shadow mask of colour CRT and its structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1297240A CN1297240A (en) | 2001-05-30 |
| CN1121055C true CN1121055C (en) | 2003-09-10 |
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ID=5282951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99123739 Expired - Fee Related CN1121055C (en) | 1999-11-18 | 1999-11-18 | Method for mfg. shadow mask of colour CRT and its structure |
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|---|---|
| CN (1) | CN1121055C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424806C (en) * | 2006-06-06 | 2008-10-08 | 烟台正海电子网板股份有限公司 | Original edition for color display tube shadow mask printing |
| US20190105698A1 (en) * | 2017-10-11 | 2019-04-11 | Biosense Webster (Israel) Ltd. | Method of producing a densely perforated tipshell from flat geometry |
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1999
- 1999-11-18 CN CN 99123739 patent/CN1121055C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1297240A (en) | 2001-05-30 |
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