JP3060643B2 - Color picture tube - Google Patents
Color picture tubeInfo
- Publication number
- JP3060643B2 JP3060643B2 JP3240675A JP24067591A JP3060643B2 JP 3060643 B2 JP3060643 B2 JP 3060643B2 JP 3240675 A JP3240675 A JP 3240675A JP 24067591 A JP24067591 A JP 24067591A JP 3060643 B2 JP3060643 B2 JP 3060643B2
- Authority
- JP
- Japan
- Prior art keywords
- shaped
- thermal expansion
- strip
- support portion
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、カラー受像管に関し、
特にその色選別電極が多数の帯状グリッド素体を架張し
て形成されるマスク構体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube,
In particular, the present invention relates to a mask structure in which the color selection electrodes are formed by stretching a number of strip-shaped grid elements.
【0002】[0002]
【従来の技術】カラー受像管の色選別電極として、例え
ば図2に示すような多数の帯状グリッド素体20を用い
た構造のものがある。これは、低炭素鋼薄板に一方向す
なわち一般には垂直方向に延びる多数の電子ビーム通過
孔となるスリットがエッチングにより形成され(各スリ
ット間に帯状グリッド素体20が形成されている)、色
選別電極となっている。この帯状グリッド素体20を1
対の相対向する略L字形の棒状支持部21とそのベッセ
ル点もしくはその近傍にて支持する略コ字形の弾性支持
部22からなるフレーム構体23上に架張してマスク構
体を成している。2. Description of the Related Art As a color selection electrode of a color picture tube, there is one having a structure using a large number of strip-shaped grid elements 20, for example, as shown in FIG. This is because a large number of electron beam passing slits extending in one direction, that is, generally in a vertical direction, are formed in a low carbon steel thin plate by etching (a strip-shaped grid body 20 is formed between each slit), and color selection is performed. It is an electrode. This strip-shaped grid body 20 is
The mask structure is formed on a frame structure 23 including a pair of substantially L-shaped bar-shaped support portions 21 opposed to each other and a substantially U-shaped elastic support portion 22 supported at or near the vessel point. .
【0003】この場合、帯状グリッド素体20が所要の
張力をもって架張されるように、フレーム構体23への
取付けに当っては、棒状支持部21を互いに引き寄せる
向きに外力を与え(加圧し)所定量たわませ、この状態
で帯状グリッド素体20を抵抗溶接もしくはレーザ溶接
にて固着する。その後、加圧を解放することでフレーム
構体23の復元力により帯状グリッド素体20に張力を
与える、いわゆるターンバックル方式がとられている。
このターンバックル方式における加圧点としては、一般
に棒状支持部21の比較的外寄りの左右1点ずつである
が、大型管のようにフレーム構体23の大きなもので
は、複数個の加圧点とすることで、局所的な応力集中を
避けていた。In this case, when attaching to the frame structure 23, an external force is applied (pressurized) in a direction to draw the rod-shaped support portions 21 together so that the strip-shaped grid body 20 is stretched with a required tension. The belt-shaped grid body 20 is fixed by resistance welding or laser welding in this state. Thereafter, a so-called turnbuckle system is employed in which the tension is applied to the strip-shaped grid body 20 by the restoring force of the frame structure 23 by releasing the pressurization.
In general, the pressure points in the turnbuckle system are relatively left and right, one at each of the left and right sides of the rod-shaped support portion 21. However, in a large frame structure 23 such as a large pipe, a plurality of pressure points are required. By doing so, local stress concentration was avoided.
【0004】[0004]
【発明が解決しようとする課題】従来のマスク構体で
は、加圧を解放した状態で帯状グリッド素体の延長方向
と直交する方向、すなわち水平方向の左右両端側におい
て、中央部に比べて帯状グリッド素体のたるみが生じが
ちであるため、左右両端側の張力が中央部の張力より大
きくなるような張力分布を持つように棒状支持部の加圧
量や加圧点を決めている。大型管のようにフレーム構体
の大きいものでは左右両端部の張力は、帯状グリッド素
体の弾性領域限界付近にまで達している。In the conventional mask structure, in the direction perpendicular to the extending direction of the strip-shaped grid body in a state where the pressure is released, that is, in the left and right end portions in the horizontal direction, the strip-shaped grid is compared with the center portion. Since the element body tends to sag, the amount of pressurization and the point of pressurization of the rod-shaped support portion are determined so that the tension at both left and right sides is greater than the tension at the center. In the case of a large frame structure such as a large tube, the tension at the left and right ends reaches near the elastic region limit of the strip-shaped grid body.
【0005】このマスク構体は、黒化処理をはじめとし
てパネルとファンネルとの封着工程、排気工程などの熱
工程を通過するが、その際のフレーム構体の熱膨張によ
り、帯状グリッド素体の延長方向への寸法拡大量が帯状
グリッド素体自身の寸法拡大量より大きいと、結果とし
てその工程中において帯状グリッド素体の張力が増加す
る。そのため、左右両端部のようにもともと張力の高い
領域では帯状グリッド素体の弾性限界を越えて塑性変形
をおこしてしまい、熱工程終了後に、所定の張力分布が
得られない問題があった。さらに、局所的な張力の不規
則によるシワ(一定曲面が出ない現象)やピッチムラが
発生するという問題があった。[0005] This mask structure passes through a heating process such as a blackening process, a sealing process between the panel and the funnel, and an exhausting process. At this time, the thermal expansion of the frame structure causes the extension of the strip-shaped grid body. If the amount of dimensional enlargement in the direction is larger than the amount of dimensional enlargement of the strip-shaped grid body itself, the tension of the strip-shaped grid body will increase during the process as a result. Therefore, in regions where the tension is originally high, such as the left and right end portions, the elastic deformation of the strip-shaped grid body is exceeded and plastic deformation occurs, and there has been a problem that a predetermined tension distribution cannot be obtained after the completion of the heating step. Further, there is a problem that wrinkles (phenomenon that a fixed curved surface does not appear) and pitch unevenness occur due to local irregularities in tension.
【0006】[0006]
【課題を解決するための手段】本発明のカラー受像管
は、略L字形の棒状支持部の底面部が、熱膨張係数の異
なる金属材にて構成されているフレーム構体を備えてお
り、高温の雰囲気の中で、帯状グリッド素体にかかる張
力の変化が少なく、架張された帯状グリッド素体面にシ
ワやピッチムラ発生を防止するものである。The color picture tube according to the present invention comprises a frame structure in which the bottom surface of a substantially L-shaped rod-shaped support portion is made of a metal material having a different coefficient of thermal expansion. In this atmosphere, the tension applied to the strip-shaped grid body is small, and wrinkles and pitch unevenness are prevented from being generated on the stretched strip-shaped grid body surface.
【0007】なお、略L字形の棒状支持部の底面部にお
いて、内側開口端側の熱膨張係数が折曲げ部側の熱膨張
係数より小さくされている。In the bottom surface of the substantially L-shaped support, the coefficient of thermal expansion at the inner opening end is smaller than the coefficient of thermal expansion at the bent portion.
【0008】[0008]
【実施例】次に本発明について図面を参照して説明す
る。図1は本発明の一実施例のマスク構体の斜視図であ
る。略L字形の棒状支持部11の底面部12において、
内側開口端13側の熱膨張係数が折曲げ部14側の熱膨
張係数より小さい金属材からなっており、その棒状支持
部のベッセル点もしくはその近傍にて支持する弾性支持
部15によりフレーム構体16は構成されている。ター
ンバックル方式により中央部より左右両端側の張力を高
くした張力分布を持つ帯状グリッド素体17からなる色
選別電極を架張してなるマスク構体を熱工程に投入する
と、フレーム構体16ならびに帯状グリッド素体17は
熱膨張するが、フレーム構体を構成している棒状支持部
11は、その底面部の折曲げ部14側より内側開口端1
3側の方が膨張係数が小さいため、相対する棒状支持部
11の中央部が遠ざかり、左右両端部が近づく、すなわ
ち棒状支持部11の曲率半径が小さくなるように変位す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a mask structure according to one embodiment of the present invention. On the bottom portion 12 of the substantially L-shaped rod-shaped support portion 11,
The frame member 16 is made of a metal material having a lower thermal expansion coefficient on the inner opening end 13 side than the thermal expansion coefficient on the bent portion 14 side, and is supported by an elastic supporting portion 15 supported at or near the Bessel point of the rod-shaped supporting portion. Is composed. When a mask structure formed by stretching a color selection electrode composed of a strip-shaped grid element 17 having a tension distribution in which the tension on the left and right ends is higher than the center by a turnbuckle method is put into a heating process, the frame assembly 16 and the strip-shaped grid Although the element body 17 thermally expands, the rod-shaped support portion 11 constituting the frame structure has an open end 1 at an inner side from the bent portion 14 side of the bottom surface.
Since the expansion coefficient is smaller on the third side, the center portion of the opposing rod-shaped support portion 11 moves away, and the left and right end portions approach each other, that is, the rod-shaped support portion 11 is displaced so as to have a smaller radius of curvature.
【0009】この棒状支持部11の変位は、左右両端側
におけるフレーム構体16の熱膨張による帯状グリッド
素体17の延長方向への寸法拡大を抑える方向に働く。
たとえば20型クラスのカラー受像管の場合、帯状グリ
ッド素体17の線熱膨張係数α=12×10-6/℃、グ
リッド寸法l=280mm,温度上昇ΔT=450℃と
すると、帯状グリッド素体17の熱膨張量Δlは、Δl
=α・ΔT・l=1.512mmとなる。一方、フレー
ム構体16の熱膨張量はその構造により異なるため定式
化できないが、通常帯状グリッド素体17より大きい値
である。ここでは帯状グリッド素体17の熱膨張量の2
倍である場合を例にとって説明する。熱膨張量の差に伴
う張力変化をなくすには、その差に応じた量だけフレー
ム構体16が逆方向に湾曲すればよい。The displacement of the rod-shaped support portion 11 acts in a direction to suppress the dimensional expansion of the strip-shaped grid body 17 in the extending direction due to the thermal expansion of the frame structure 16 at both left and right ends.
For example, in the case of a 20-inch class color picture tube, assuming that the linear thermal expansion coefficient α of the strip-shaped grid element 17 is α × 12 × 10 −6 / ° C., the grid dimension l is 280 mm, and the temperature rise ΔT is 450 ° C., The thermal expansion amount Δl of No. 17 is Δl
= Α · ΔT · l = 1.512 mm. On the other hand, the amount of thermal expansion of the frame structure 16 cannot be formulated because it differs depending on the structure thereof, but is usually a value larger than the band-shaped grid body 17. Here, the thermal expansion amount of the strip-shaped grid body 17 is 2
The case where the number is double will be described as an example. In order to eliminate the change in tension due to the difference in the amount of thermal expansion, the frame structure 16 may be curved in the opposite direction by an amount corresponding to the difference.
【0010】帯状グリッド素体17とフレーム構体16
の帯状グリッド素体17の延長方向への熱膨張量の差
は、1.512mmである。棒状支持部11は弾性支持
部15と固着されているから、その熱変位は両端支持の
ハリと等価とみなせる。両端支持型バイメタルの変位量
は次式で表わされる。The strip-shaped grid body 17 and the frame structure 16
The difference in the amount of thermal expansion in the extension direction of the strip-shaped grid body 17 is 1.512 mm. Since the rod-shaped support portion 11 is fixed to the elastic support portion 15, its thermal displacement can be regarded as being equivalent to the tension at both ends. The amount of displacement of the bimetal supported at both ends is expressed by the following equation.
【0011】 D=K・ΔT・L2 /4t … (1) ここでDは変位量、Kは湾曲係数、ΔTは温度変化、L
は作動長(支持点の長さ)、tはバイメタルの板厚であ
る。(1)式を変形すると湾曲定数Kは K=4t・D/ΔT・L2 … (2) で表わせる。いまD=1.512mm,ΔT=450
℃,L=215mmとし、バイメタルの板厚すなわち略
L字形の棒状支持部11の底面の長さt=20mmの
時、(2)式より必要な湾曲定数はK=5.815×1
0-6/℃と求まる。D = K · ΔT · L 2 / 4t (1) where D is a displacement amount, K is a curvature coefficient, ΔT is a temperature change, L
Is the operating length (length of the support point), and t is the thickness of the bimetal. By transforming equation (1), the curvature constant K can be expressed as K = 4t · D / ΔT · L 2 (2) Now D = 1.512 mm, ΔT = 450
C, L = 215 mm, and when the plate thickness of the bimetal, that is, the length t of the bottom surface of the substantially L-shaped bar-shaped support portion 11 is 20 mm, the required bending constant is K = 5.815 × 1 according to the equation (2).
0 -6 / ° C.
【0012】2つの異なる金属を接合した時の湾曲定数
は、一般に次式で表わされる。The bending constant when two different metals are joined is generally expressed by the following equation.
【0013】 [0013]
【0014】ここでΔaは熱膨張係数の差、mは各材料
の板厚もしくは板幅の比,nは各材料の弾性係数の比で
ある。いま、略L字状棒状支持部を形成するに当り、そ
の底面部の内側開口端側に低熱膨張材としてフェルニコ
材(熱膨張係数:5.5×10-6/℃,弾性係数:14
100kg/mm2 )を用い、折曲げ部側を鉄材(熱膨
張係数:14×10-6/℃,弾性係数:20000kg
/mm2 )とした場合、(3)式をmについて解くと、
m=0.6545となる。すなわち、鉄材の領域:フェ
ルニコの領域=1:0.6545とすれば所定の湾曲定
数を得ることができる。低熱膨張側に他の材料、例えば
42合金(熱膨張係数6.7×10-6/℃,弾性係数:
14800kg/mm2 )を用いた場合、得られる湾曲
定数の最大値はK=5.475×10-6/℃,(m=
1.17のとき)であり、所定の値にわずかに足りない
が、実用上特に問題なく使える。Here, Δa is the difference between the coefficients of thermal expansion, m is the ratio of the thickness or width of each material, and n is the ratio of the elastic coefficients of each material. Now, in forming the substantially L-shaped rod-shaped support portion, a fernico material (thermal expansion coefficient: 5.5 × 10 −6 / ° C., elastic coefficient: 14) is formed as a low thermal expansion material on the inner opening end side of the bottom portion.
100 kg / mm 2 ) and the bent portion side is made of an iron material (thermal expansion coefficient: 14 × 10 −6 / ° C., elastic modulus: 20000 kg)
/ Mm 2 ), solving equation (3) for m gives
m = 0.6545. That is, a predetermined curvature constant can be obtained by setting the region of the iron material to the region of the fernico = 1: 0.6545. On the low thermal expansion side, another material, for example, 42 alloy (thermal expansion coefficient: 6.7 × 10 −6 / ° C., elastic modulus:
When using 14800 kg / mm 2 ), the maximum value of the obtained bending constant is K = 5.475 × 10 −6 / ° C., (m =
1.17), which is slightly less than the predetermined value, but can be used practically without any problem.
【0015】[0015]
【発明の効果】以上説明したように本発明は、略L字状
の棒状支持部においてその底面部の内側開口端側の熱膨
張係数が折り曲げ部側の熱膨張係数より小さい金属材と
したので、ターンバックル方式により中央部より左右両
端側の張力を高くした張力分布を持つ帯状グリッド素体
からなる色選別電極を架張したマスク構体を熱工程に投
入した際、棒状支持部がその曲率半径が小さくなるよう
に変位が起こるため、熱膨張による帯状グリッド素体の
延長方向へのフレーム構体と帯状グリッド素体の膨張量
の差は、棒状支持部の左右両端側で縮小する。従って、
もとの張力が高い棒状支持部の左右両端側の張力を変え
ることなくもしくは、あまり増加させることなく熱工程
を通過するので、その結果として帯状グリッド素体の塑
性変形を防ぐことができ、所定の張力分布を保てる。ま
た、シワやピッチムラの発生を抑える効果がある。As described above, according to the present invention, in the substantially L-shaped rod-shaped support portion, the metal material whose thermal expansion coefficient on the inner opening end side of the bottom surface is smaller than the thermal expansion coefficient on the bent portion side is used. When a mask structure in which a color selection electrode composed of a strip-shaped grid element having a tension distribution in which the tension on both the left and right ends is higher than that of the center part by a turnbuckle method is put into a heating process, the rod-shaped support part has a radius of curvature. Therefore, the difference in the amount of expansion between the frame structure and the strip-shaped grid body in the extension direction of the strip-shaped grid body due to thermal expansion is reduced at both left and right sides of the rod-shaped support portion. Therefore,
Since the heat process passes through the heating process without changing or increasing the tension at the left and right ends of the rod-shaped support portion having a high original tension, plastic deformation of the strip-shaped grid body can be prevented as a result. Tension distribution can be maintained. In addition, there is an effect of suppressing generation of wrinkles and pitch unevenness.
【図1】本発明の一実施例のマスク構体の斜視図であ
る。FIG. 1 is a perspective view of a mask structure according to an embodiment of the present invention.
【図2】従来のマスク構体の斜視図である。FIG. 2 is a perspective view of a conventional mask structure.
11,21 棒状支持部 15,22 弾性支持部 17,20 帯状グリッド素体 12 底面部 13 内側開口端 14 折曲げ部 16,23 フレーム構体 11, 21 rod-shaped support portion 15, 22 elastic support portion 17, 20 strip-shaped grid body 12 bottom portion 13 inner open end 14 bent portion 16, 23 frame structure
Claims (2)
字形の弾性支持部からなるフレーム構体に一方向に沿っ
て架張された多数の帯状グリッド素体を溶接により固着
したマスク構体を有するカラー受像管において、前記略
L字形の棒状支持部の底面部が内側開口端側と折曲げ部
側とで熱膨張係数が異なる材料でできていることを特徴
とするカラー受像管。1. A mask structure in which a large number of strip-shaped grid bodies stretched along one direction are fixed to a frame structure composed of opposing substantially L-shaped rod-shaped support portions and substantially U-shaped elastic support portions by welding. Wherein the bottom surface of the substantially L-shaped rod-shaped support portion is made of a material having a different coefficient of thermal expansion between the inner opening end side and the bent portion side.
いて、内側開口端側の熱膨張係数が折曲げ部側の熱膨張
係数よりも小さい請求項1記載のカラー受像管。2. The color picture tube according to claim 1, wherein a thermal expansion coefficient at an inner opening end side is smaller than a thermal expansion coefficient at a bent portion side at a bottom surface of the substantially L-shaped rod-shaped support portion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3240675A JP3060643B2 (en) | 1991-09-20 | 1991-09-20 | Color picture tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3240675A JP3060643B2 (en) | 1991-09-20 | 1991-09-20 | Color picture tube |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0582042A JPH0582042A (en) | 1993-04-02 |
JP3060643B2 true JP3060643B2 (en) | 2000-07-10 |
Family
ID=17063036
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3240675A Expired - Lifetime JP3060643B2 (en) | 1991-09-20 | 1991-09-20 | Color picture tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3060643B2 (en) |
-
1991
- 1991-09-20 JP JP3240675A patent/JP3060643B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0582042A (en) | 1993-04-02 |
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A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20000328 |