CN1202721A - Thin shadow mask for colour display tube - Google Patents
Thin shadow mask for colour display tube Download PDFInfo
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- CN1202721A CN1202721A CN 97105331 CN97105331A CN1202721A CN 1202721 A CN1202721 A CN 1202721A CN 97105331 CN97105331 CN 97105331 CN 97105331 A CN97105331 A CN 97105331A CN 1202721 A CN1202721 A CN 1202721A
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- shadow mask
- millimeter
- slotted eye
- width
- display tube
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Abstract
The shadow mask fixed onto the support frame inside the screen has a thickness of 0.18minus or plus0.02 mm and prolate slots. The slots have smaller size on the inner surface of the shadow mask and larger on the outer surface. The longitudinal slot pitch Br, the slot width S on the inner surface and the slot width S' on the outer surface change with the position x and yin certain regulation. Compared with available 0.22 mm thick shadow mask, the said one has cost 10% lower and 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, intersect at the center of described planar mask slotted eye 44 after its three electron beam line focuses simultaneously.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 practical working situation, 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) chromoscopes 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 chromoscope and 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 chromoscope 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 chromoscope, make it and use the chromoscope 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 thin shadow mask for colour display tube, be one be roughly rectangle and oriented all around in flanging, be covered with on the whole simultaneously eyelet sheet metal it be fixed on the support frame of fluorescent screen inside.The thickness δ of described shadow mask is 0.18 ± 0.02 millimeter, and each eyelet is a slit-like opening on it, rectangle, and it has reduced size on the inner surface of shadow mask (towards electron gun), on (towards fluoroscopic) outer surface large-size is arranged then.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.Each slotted eye in the width S on the aperture face and it width S on the macropore face '=S+Ti+To, and the wide Br of bridge changes by given rule with coordinate figure x, y and changes.
The drawing of accompanying drawing is described as follows:
Fig. 1 is the vertical cross-sectional schematic of chromoscope;
Fig. 2 is the reference coordinate system X-Y of interior phosphor screen 2 of chromoscope 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 be described slotted eye 44 width S on the aperture face 41 on macropore face 42 increment Ti and the graphic representation of To.
Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing: thin shadow mask for colour display tube 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 on the inner surface 41 of shadow mask 4 (towards electron gun 1), on (towards phosphor screen 2) outer surface 42 large-size is arranged then.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.Each slotted eye 44 in the width S on the aperture face 41 and it width S on macropore face 42 '=S+Ti+To, and the wide Br of bridge changes by given rule with coordinate figure x, y and changes.
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), value such as the following table of each constant A, B, C, D in the formula: table 1
| ?????A | ????B | ?????C | ??????D |
| 0.17 millimeter | 3.61×10 -9 | -1.58×10 -7 | ?2.49×10 -14 |
Described each slotted eye 44 is in its width S on aperture face 41 of the width S on the macropore face 42 ' compare, rule such as following table that the value of corresponding increment T=Ti+To changes apart from the length L of minor axis Y with described slotted eye 44 central points:
Table 2
| ?L | ????0 | ????100 | ????180 | ||
| T size millimeter | ??Ti | Maximum | ????0.15 | ????0.12 | ????0.11 |
| Minimum | ????0 | ????0 | ????0 | ||
| ??To | Maximum | ????0.14 | ????0.18 | ????0.21 | |
| Minimum | ????0.09 | ????0.11 | ????0.15 | ||
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 chromoscope 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 chromoscope 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 Tr of described thin shadow mask 4 satisfies following table and requires: table 3
| Central authorities | Diagonal axis (36.87 °) | X-axis | Y-axis | ||
| ????R100 | ????R220 | ????R180 | ????R180 | ||
| Transmitance Tr (%) | ??20.0 | ????19.4 | ????17.4 | ????17.4 | ????19.6 |
| A (central Tr-periphery Tr) (%) | ??- | ????0.6 | ????2.7 | ????2.7 | ????0.4 |
| B (Max-Min on the same circumference) | ??- | Below 1.5% | |||
So design the distribution of shadow mask passthrough rating Tr like this, be for guaranteeing that color picture tube can have suitable Luminance Distribution after using thin shadow mask 4 of the present invention.
The following geometric parameter of a most preferred embodiment of narration 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 aforementioned each relational expression (α), (β) and table 1, table 2.Horizontal pitch P
H, between 0.65～0.96 millimeter, be and increase progressively rule and change at the numerical value of other each point.
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 planar graph that exposes 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 groove 44.Then described phosphor screen 2 is bonded together with chromoscope 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 chromoscope 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, and to the wide Br of width S, bridge, increment Ti and the To of width S on macropore face 42 of each slotted eye 44 on the shadow mask eyelet face, and parameter such as shadow mask passthrough rating Tr has all been done redesign.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 chromoscope 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 thin shadow mask for colour display tube 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 on the inner surface (41) of shadow mask 4 (towards electron gun (1)), on (42) large-size is arranged then at (towards phosphor screen (2)) outer surface; 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; Each slotted eye (44) in the width S on the aperture face (41) and it width S on macropore face (42) '=S+Ti+To, and the wide Br of bridge changes by given rule with coordinate figure x, y and changes.
2. according to the described thin shadow mask for colour display tube 4 of claim 1, 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), value such as the following table of each constant A, B, C, D in the formula:
?????A ????B ?????C ???????D
0.17 millimeter 3.61×10
-9 -1.58×10
-7 ??2.49×10
-14
3. according to the described thin shadow mask for colour display tube 4 of claim 1, it is characterized in that: described each slotted eye (44) is in its width S on aperture face (41) of the width S on the macropore face (42) ' compare, rule such as following table that the value of corresponding increment T=Ti+To changes apart from the length L of minor axis Y with described slotted eye (44) central point:
???L ????0 ????100 ????180
T size millimeter ??Ti Maximum ????0.15 ????0.12 ????0.11
Minimum ????0 ????0 ????0
??To Maximum ????0.14 ????0.18 ????0.21
Minimum ????0.09 ????0.11 ????0.15
4. according to the described thin shadow mask for colour display tube 4 of claim 1, it is characterized in that: 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).
5. according to the described thin shadow mask for colour display tube 4 of claim 1, it is characterized in that: the transmitance Tr of described thin shadow mask satisfies following table and requires:
Central authorities Diagonal axis (36.87 °) X-axis Y-axis
????R100 ????R220 ????R180 ????R180
Transmitance Tr (%) ??20.0 ????19.4 ????17.4 ????17.4 ????19.6
A (central Tr-periphery Tr) (%) ????- ????0.6 ????2.7 ????2.7 ????0.4
B (Max-Min on the same circumference) ????- 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 true CN1202721A (en) | 1998-12-23 |
| CN1086506C 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418179C (en) * | 2004-03-12 | 2008-09-10 | Lg.飞利浦显示器（韩国）株式会社 | Colour 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 |
Families Citing this family (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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0275132A (en) * | 1988-09-09 | 1990-03-14 | Hitachi Ltd | Shadow mask type color cathode-ray tube |
| JPH06275206A (en) * | 1993-03-19 | 1994-09-30 | Hitachi Ltd | Color cathode-ray tube with shadow mask of variable hole pitch |
-
1997
- 1997-06-18 CN CN97105331A patent/CN1086506C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418179C (en) * | 2004-03-12 | 2008-09-10 | Lg.飞利浦显示器（韩国）株式会社 | Colour 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1086506C (en) | 2002-06-19 |
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| SE01 | Entry into force of request for substantive examination | ||
| AR01 | Abandonment of patent right to avoid double patenting |
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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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |