CN1086506C - Thin shadow mask for colour display tube - Google Patents
Thin shadow mask for colour display tube Download PDFInfo
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- CN1086506C CN1086506C CN97105331A CN97105331A CN1086506C CN 1086506 C CN1086506 C CN 1086506C CN 97105331 A CN97105331 A CN 97105331A CN 97105331 A CN97105331 A CN 97105331A CN 1086506 C CN1086506 C CN 1086506C
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Abstract
The present invention relates to a thin shadow mask for a color display tube, which is fixed to a supporting frame on the inner side of a fluorescent screen. The width delta of the shadow mask is 0.18+-0.02 millimeters and eyelets 44 on the shadow mask are rectangular slot-shaped holes, wherein each slot-shaped hole 44 has a smaller size on the inner surface 41 of the shadow mask and a larger size on the outer surface 42 of the shadow mask. Bridge width Br, namely the length of two adjacent slot-shaped holes 44 on the vertical connecting segment 46 of the small hole surface 41, the width S of each slot-shaped hole 44 on the 41 and the width S' of each slot-shaped hole 44 on the large hole surface 42 are changed along coordinate values x, y according to a given rule. Compared with a shadow mask with the width delta of 0.22 millimeters, the shadow mask reduces 18% of material cost and about 10% of price and has the same display quality.
Description
The present invention relates to electron tube, particularly relate to the parts of cathode ray tube (CRT).
Use the cathode-ray tube display image in the TV tech, normally use picture tube.For color display, use the picture tube of three electron-beam, referring to Fig. 1, alternate 1,100 the vertical stripeds of fluorescent material that can manifest three kinds of colors of red, green, blue respectively that applying on its phosphor screen 2, adjacent three primary colors vermicelli constitute one group of three primary colors vermicelli group, and be provided with a metal shadow mask plate 4 in these phosphor screen 2 inboards, the slotted eye 44 that adapts with described three primary colors vermicelli group number is arranged on the plate.Most color picture tubes are three rifle three-beam tubes, and its three electron beams intersect at the center of described planar mask slotted eye 44 simultaneously after assembling.The effect of planar mask 4 is to guarantee that every electron beam can only beat in whole scanning process on corresponding color vermicelli separately.Three electron-beam is beaten in the central authorities of corresponding color vermicelli separately, is called best screen, and this moment, colorimetric purity was best.But under actual working state, causing the screen state deteriorating because various factors changes, influencing the colorimetric purity of color picture tube, this type of phenomenon is called colour purity drift.For sake of convenience, all abbreviate shadow mask below the described planar mask as.
The low carbon steel plate manufacturing that shadow mask 4 most use AK materials (aluminum killed steel) of 54 centimetres of (21 inches) color picture tubes of prior art, thickness are 0.15 or 0.22 millimeter.Adopt 0.15 millimeter thin steel plate manufacturing, must apply strengthened coat on shadow mask 4, for example pottery improves shadow mask intensity, to alleviate since during work hot arching cause the picture tube colour purity drift.This manufacturing process reduces the yields of color picture tube, makes its production cost increase.Adopt 0.22 millimeter thicker steel plate, although applying coating on shadow mask again, its material price is more expensive, and the color picture tube production cost is increased.
The objective of the invention is to avoid above-mentioned the deficiencies in the prior art part and provide a kind of thickness δ between two kinds of Commonly Used Sizes and don't must change the thin shadow mask of existing manufacturing process, thereby significantly reduce the material cost of shadow mask, and need not transform original production equipment, fully can be in process of production with thick type shadow mask compatibility, but needn't be on shadow mask spray intensified coating reduce the colour purity drift of color picture tube, make it and use the color picture tube of prior art shadow mask to have performance about the same and quality.
Purpose of the present invention can be by realizing by the following technical solutions: manufacture and design a kind of color picture tube thin shadow mask, be one and be roughly rectangle and oriented interior flanging all around, be covered with simultaneously the sheet metal of eyelet on the whole, it is fixed on the support frame of fluorescent screen inside.The thickness δ of described thin shadow mask is 0.18 ± 0.02 millimeter, and each eyelet is a slit-like opening on it, rectangle, and it has reduced size at shadow mask on the inner surface of electron gun, large-size is then being arranged on fluoroscopic outer surface.Getting Descartes's rectangular coordinate system X-Y is reference system, and the initial point of coordinate system X-Y is located on the intersection point of phosphor screen two diagonal axis; The length direction of each slotted eye is vertical, is parallel to fluoroscopic minor axis Y, and adjacent two slotted eyes are at the vertical connected section of aperture face, and its length is the wide Br of bridge.The wide Br of described bridge, each slotted eye in the width S on the aperture face and it width S on the macropore face '=S+T
i+ r
o, T wherein
iThe width S ' with respect to width S that is described slotted eye is near the inboard increment of Y direction, T
oBe the outside increment that deviates from Y direction, they all change by given rule with coordinate figure x, y and change.
The drawing of accompanying drawing is described as follows:
Fig. 1 is the vertical cross-sectional schematic of color picture tube;
Fig. 2 is the reference coordinate system X-Y of interior phosphor screen 2 of color picture tube and shadow mask 4
Fig. 3 is the enlarged drawing of thin shadow mask 4 of the present invention rectangle slotted eye 44 on macropore face 42:
Fig. 4 is that described slotted eye 44 is in the width S on the macropore face 42 ' with respect to the increment T of width S on aperture face 41
iAnd T
oGraphic representation.
Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing: color picture tube thin shadow mask 4 of the present invention, as shown in Figure 1 and Figure 2, be one and be roughly rectangle and oriented interior flanging 43 all around, be covered with simultaneously the sheet metal of eyelet 44 on the whole, it is fixed on the support frame 3 of phosphor screen 2 inboards.Described thin shadow mask 4 adopts the low carbon steel plate manufacturing of AK material, thickness δ is 0.18 ± 0.02 millimeter, each eyelet 44 is a slit-like opening on it, rectangle, referring to Fig. 3 and Fig. 4, it has reduced size at shadow mask 4 on the inner surface 41 of electron gun 1, on the outer surface 42 of phosphor screen 2 large-size is being arranged then; Getting Descartes's rectangular coordinate system X-Y is reference system, and the initial point of coordinate system X-Y is located on the intersection point of 2 liang of diagonal axis of phosphor screen; The length direction of each slotted eye 44 is vertical, is parallel to the minor axis Y of phosphor screen 2, and adjacent two slotted eyes 44 are at the vertical connected section 46 of aperture face 41, and its length is the wide Br of bridge.The wide Br of described bridge, each slotted eye 44 in the width S on the aperture face 41 and it width S on macropore face 42 '=S+T
i+ T
o, T wherein
iThe width S ' with respect to width S that is described slotted eye 44 is near the inboard increment of Y direction, T
oBe the outside increment that deviates from Y direction, they all change by given rule with coordinate figure x, y and change.
On thin shadow mask 4 of the present invention, the width S of described each slotted eye 44 on aperture face 41 comply with coordinate figure x, y variation and satisfied relational expression
S=A+B|x|
3+ Cy
2+ D|x|
3Y
2(millimeter) (α), the value of each constant A, B, C, D is in the formula
The A=0.17 millimeter, B=3.61 * 10
-9Millimeter, C=-1.58 * 10
-7Millimeter,
D=2.49 * 10
-14Millimeter.Described each slotted eye 44 is in the width S on the macropore face 42 ' compare its width S on aperture face 41, corresponding increment T=T
i+ T
oValue as follows with described slotted eye 44 central points apart from the rule that the length L of minor axis Y changes
During L=0, T
i=0.00～0.15 millimeter, T
o=0.09～0.14 millimeter;
The L=100 millimeter, T
i=0.00～0.12 millimeter, T
o=0.11～0.18 millimeter;
The L=180 millimeter, T
i=0.00～0.11 millimeter, T
o=0.15～0.21 millimeter.
Described each slotted eye 44 assortment on shadow mask changes by given rule respectively along major axis X and minor axis Y direction, its objective is identical into the performance of the color picture tube that guarantees to adopt thin shadow mask 4 of the present invention and the thick type shadow mask of employing.It then is manufacturing process and original the just the same of thick type shadow mask that adopt for the color picture tube that guarantees to adopt thin shadow mask 4 of the present invention that the distribution of each slotted eye 44 width S changes by another given rule along major axis X and minor axis Y direction.Adjacent two slotted eyes 44 are at the vertical linkage section 46 of aperture face 41, and its length Br is linear change along the major axis directions X with coordinate figure x, satisfies following relational expression:
Br=0.11+5.2 * 10
-5| x| (millimeter) is (β).The transmitance T of described thin shadow mask 4
r(%) satisfy following requirement;
1. at the central part of phosphor screen 2, the x=y=0 place is 20.0;
2. on the diagonal axis (with 36.87 ° of X-axis angles) of phosphor screen 2
R100 place (mid point of described diagonal axis is the center of circle, and 100 millimeters are radius) is 19.4,
R220 place (mid point of described diagonal axis is the center of circle, and 220 millimeters are radius) is 17.4,
3. on the X-axis of phosphor screen 2
R180 place (initial point of described X-axis is the center of circle, and 180 millimeters are radius) is 17.4,
4. on the Y-axis of phosphor screen 2
R120 place (initial point of described Y-axis is the center of circle, and 120 millimeters are radius) is 19.6,
5. the deviate Δ T of transmitance
r(central T
r-peripheral T
r) (%)
On described diagonal axis (36.87 °), the R100 place is 0.6, and the R220 place is 2.7,
On X-axis, the R180 place is 2.7,
On Y-axis, the R120 place is 0.4,
6. the deviate Δ T of transmitance
r' (Max-Min on the same circumference) (%)
At described diagonal axis (36.87 °) and on X-axis and Y-axis, be below 1.5.So design shadow mask passthrough rating T like this
rDistribution, be for guaranteeing that color picture tube can have suitable Luminance Distribution after using thin shadow mask 4 of the present invention.
Below narrate the geometric parameter of a most preferred embodiment of thin shadow mask 4 of the present invention; On the sheet metal of AK material δ=0.18 millimeter, make each slotted eye 44.Slotted eye 44 degree of depth equal shadow mask thickness, promptly described sheet metal thickness δ, and its width S satisfies aforementioned relational expression (α); The length of slotted eye 44 is 0.46～0.69 millimeter, the length of linkage section 46, and promptly the wide Br of bridge satisfies relational expression (β).One group of parameter is for example arranged: on aperture face 41, the width S of center slotted eye 44=0.17 millimeter, the width S of same slotted eye '=0.41 millimeter on the macropore face; Y direction is indulged pitch, and promptly the adjacent two slotted eye centers of shadow mask are at vertical distance, P
V=0.60 millimeter is a constant; The horizontal pitch of X-direction is exactly that the adjacent two slotted eye centers of shadow mask are in horizontal distance, at the center of shadow mask 4, P
H=0.65 millimeter, the wide Br=0.11 millimeter of bridge, they satisfy each relational expression (α), (β) and transmitance T on this Instructions Page 3
rThe regulation of relevant value.Horizontal pitch P
H, between 0.65～0.96 millimeter, be and increase progressively rule and change at the numerical value of other each points.
According to the result of calculation figure of each slotted eye 44 on aperture face 41 and macropore face 42 that draw, they are printed on the plate glass motherboard as described thin shadow mask 4.With a volume thickness δ=0.18 millimeter, width is 460 millimeters, and the AK material low carbon steel plate that surfaces externally and internally all is coated with photoresists is put together with described motherboard, see through motherboard with ultraviolet source and shine photosensitive layer on the described low carbon steel plate, make it the sex change sclerosis, use the unmodified photoresists of developer solution flush away again, make the parallel pattern of exposing each slotted eye 44 on the described steel plate.Then described steel plate is immersed the liquor ferri trichloridi corrosion, so the just etching sheet metal that be covered with slotted eye 44 the same that come out with the motherboard figure.Washing the photoresists that shield on it, cut into the breadth size of appropriate size, promptly is the finished product planar mask.When assembling is used, with forcing press and mould described planar mask is inwardly extruded flanging 43, and it is weldingly fixed on the support frame 3, together with the inboard of support frame 3 integral installations at phosphor screen 2, then, with this shadow mask 4 is template, is coated with in the inboard of phosphor screen 2 to apply the red, green, blue three-color phosphor group corresponding with each slotted eye 44.Then described phosphor screen 2 is bonded together with color picture tube cone 6 with glass powder with low melting point, encapsulate upper gun again, through vacuum exhaust process and explosion-proof processing, put deflecting coil at the position of cone 6 then, it is appropriate to adjust, and one is used the color picture tube of thin shadow mask 4 of the present invention just to make.
The present invention is after with material for shadow mask thickness δ attenuate, to the wide Br of width S, bridge, the increment T of width S on macropore face 42 of each slotted eye 44 on the shadow mask eyelet face
iAnd T
o, and shadow mask passthrough rating T
rAll done redesign etc. parameter.Suitable groove width, bridge is wide and the comprehensive Design of shadow mask passthrough rating provide sufficiently high shadow mask intensity and with the colour purity of the akin color picture tube of thick type shadow mask through the time variable quantity, and reach better electron beam and the screen effect, guaranteed the video picture quality of color picture tube.Because be to adopt and the identical production technology of prior art, exempted the improvement expenses of production equipment, compatible fully with the color picture tube that adopts thick type shadow mask in process of production.Shadow mask with prior art δ=0.22 millimeter is compared, and the present invention can reduce material cost 18% owing to adopt δ=0.18 millimeter steel plate to make shadow mask, and it is about 10% to make the shadow mask price reduce, and the video picture quality is then just the same.
Claims (5)
1. a color picture tube book type shadow mask (4) is one and is roughly rectangle and oriented interior flanging (43) all around, and be covered with the sheet metal of eyelet (44) simultaneously on the whole, it is fixed on the inboard support frame (3) of phosphor screen (2), it is characterized in that:
The thickness δ of described thin shadow mask (4) is 0.18 ± 0.02 millimeter, each eyelet (44) is a slit-like opening on it, rectangle, it has reduced size at shadow mask (4) on the inner surface (41) of electron gun (1), on the outer surface (42) of phosphor screen (2) large-size is being arranged then; Getting Descartes's rectangular coordinate system X-Y is reference system, and the initial point of coordinate system X-Y is located on the intersection point of phosphor screen (2) two diagonal axis; The length direction of each slotted eye (44) is vertical, is parallel to the minor axis Y of phosphor screen (2), and adjacent two slotted eyes (44) are at the vertical connected section (46) of aperture face (41), and its length is the wide Br of bridge; The wide Br of described bridge, the width S of each slotted eye (44) on aperture face (41) and it are at the macropore face
(42) width S on '=S+T
i+ T
o, T wherein
iThe width S ' with respect to width S that is described slotted eye (44) is near the inboard increment of Y direction, T
oBe the outside increment that deviates from Y direction, they all change by given rule with coordinate figure x, y and change.
2. according to the described color picture tube thin shadow mask of claim 1 (4), it is characterized in that: the width S of described each slotted eye (44) on aperture face (41) comply with coordinate figure x, y variation and satisfied relational expression
S=A+B|x|
3+ Cy
2+ D|x|
3Y
2(millimeter)
The value of each constant A, B, C, D is in the formula
The A=0.17 millimeter, B=3.61 * 10
-9Millimeter, C=-1.58 * 10
-7Millimeter,
D=2.49 * 10
-14Millimeter.
3. according to the described color picture tube thin shadow mask of claim 1 (4), it is characterized in that; Described each slotted eye (44) is at the width S on the macropore face (42) ' compare its width S on aperture face (41), corresponding increment T=T
i+ T
oValue as follows with described slotted eye (44) central point apart from the rule that the length L of minor axis Y changes
During L=0, T
i=0.00～0.15 millimeter, T
o=0.09～0.14 millimeter;
The L=100 millimeter, T
i=0.00～0.12 millimeter, T
o=0.11～0.18 millimeter;
The L=180 millimeter, T
i=0.00～0.11 millimeter, T
o=0.15～0.21 millimeter.
4. connect according to the described color picture tube thin shadow mask of claim 1 (4), it is characterized in that: adjacent two slotted eyes
(44) at the vertical linkage section (46) of aperture face (41), its length Br is linear change along the major axis directions X with coordinate figure x, satisfies following relational expression:
Br=0.11+5.2 * 10
-5| x| (millimeter).
5. according to the described color picture tube thin shadow mask of claim 1 (4), it is characterized in that: the transmitance T of described thin shadow mask (4)
r(%) satisfy following requirement:
1. at the central part of phosphor screen (2), the x=y=0 place is 20.0;
2. on the diagonal axis (with 36.87 ° of X-axis angles) of phosphor screen (2)
R100 place (mid point of described diagonal axis is the center of circle, and 100 millimeters are radius) is 19.4,
R220 place (mid point of described diagonal axis is the center of circle, and 220 millimeters are radius) is 17.4,
3. on the X-axis of phosphor screen (2)
R180 place (initial point of described X-axis is the center of circle, and 180 millimeters are radius) is 17.4,
4. on the Y-axis of phosphor screen (2)
R120 place (initial point of described Y-axis is the center of circle, and 120 millimeters are radius) is 19.6,
5. the deviate Δ T of transmitance
r(central T
r-peripheral T
r) (%)
On described diagonal axis (36.87 °), the R100 place is 0.6, and the R220 place is 2.7,
On X-axis, the R180 place is 2.7,
On Y-axis, the R120 place is 0.4,
6. the deviate Δ T of transmitance
r' (Max-Min on the same circumference) (%)
At described diagonal axis (36.87 °) and on X-axis and Y-axis, be below 1.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97105331A CN1086506C (en) | 1997-06-18 | 1997-06-18 | Thin shadow mask for colour display tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97105331A CN1086506C (en) | 1997-06-18 | 1997-06-18 | Thin shadow mask for colour display tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1202721A CN1202721A (en) | 1998-12-23 |
| CN1086506C true CN1086506C (en) | 2002-06-19 |
Family
ID=5167843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97105331A Expired - Fee Related CN1086506C (en) | 1997-06-18 | 1997-06-18 | Thin shadow mask for colour display tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1086506C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361259C (en) * | 2003-05-19 | 2008-01-09 | 彩虹集团电子股份有限公司 | Calculation of plate shadow for eliminating central bright spot in color picture tube |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050091399A (en) * | 2004-03-12 | 2005-09-15 | 엘지.필립스 디스플레이 주식회사 | Cathode ray tube |
| CN101202188B (en) * | 2007-11-06 | 2010-06-23 | 烟台正海电子网板股份有限公司 | Edge treatment process for color kinescope used flat-plate shadow mask |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1017481B (en) * | 1988-09-09 | 1992-07-15 | 株式会社日立制作所 | Color cathode ray tube of shadow mask type |
| CN1095522A (en) * | 1993-03-19 | 1994-11-23 | 株式会社日立制作所 | The color cathode ray tube that contains the shadow mask in the hole that band is dull, non-decreasing is arranged pitch |
-
1997
- 1997-06-18 CN CN97105331A patent/CN1086506C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1017481B (en) * | 1988-09-09 | 1992-07-15 | 株式会社日立制作所 | Color cathode ray tube of shadow mask type |
| CN1095522A (en) * | 1993-03-19 | 1994-11-23 | 株式会社日立制作所 | The color cathode ray tube that contains the shadow mask in the hole that band is dull, non-decreasing is arranged pitch |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361259C (en) * | 2003-05-19 | 2008-01-09 | 彩虹集团电子股份有限公司 | Calculation of plate shadow for eliminating central bright spot in color picture tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1202721A (en) | 1998-12-23 |
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According to article 9 of the patent law and article 13 of the detailed rules for the implementation of the patent law: 97105331.6 of the invention patents in the current issue of authorization announcement, and at the same time corresponding to the 97204051.X utility model patent to be given up, and in the 25 issue of the utility model of the communique on the patent right to abandon the announcement. |
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