JPS62249340A - Cathode-ray tube - Google Patents
Cathode-ray tubeInfo
- Publication number
- JPS62249340A JPS62249340A JP9406386A JP9406386A JPS62249340A JP S62249340 A JPS62249340 A JP S62249340A JP 9406386 A JP9406386 A JP 9406386A JP 9406386 A JP9406386 A JP 9406386A JP S62249340 A JPS62249340 A JP S62249340A
- Authority
- JP
- Japan
- Prior art keywords
- grid electrode
- cathode
- electron
- curvature
- voltage side
- 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.)
- Pending
Links
- 238000010894 electron beam technology Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000005855 radiation Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 5
- 229910052788 barium Inorganic materials 0.000 description 3
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明はＴＶ用あるいはディスプレイ用陰極線管に関
し、詳しくは不要電子放射の減少を図った陰極線管に関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cathode ray tube for TV or display use, and more particularly to a cathode ray tube designed to reduce unnecessary electron radiation.
［従来の技術］
一般に陰極線管は、第３図に示すように、パネル部（１
）とファンネル部（２）とネック部（３）とから成るガ
ラスバルブ（４）を有し、このガラスバルブ（４）の内
外面には、内部導電膜（５）と外部導電膜（８）が設け
られており、内部導電膜（５）はネック部（３）の内面
まで延在して、ネック部（３）内に収容されている電子
銃構体（７）に接続されている。[Prior Art] Generally, a cathode ray tube has a panel section (1
), a funnel part (2), and a neck part (3).The glass bulb (4) has an inner conductive film (5) and an outer conductive film (8) on its inner and outer surfaces. An internal conductive film (5) extends to the inner surface of the neck (3) and is connected to an electron gun assembly (7) housed within the neck (3).
上記電子銃構体（７）の−例として、マルチステップフ
ォーカス形電子銃の構成を第４図に示す。As an example of the electron gun assembly (7), the configuration of a multi-step focus type electron gun is shown in FIG.
この図に示すように、電子銃構体（７）は、第６格子電
極（８）、第５格子電極（９）、第４格子電極（１０）
、第３格子電極（１１）、第２格子電極（１２）、第１
格子電極（１３）、カソード（１４）の各電極と、これ
らの電極を一体に保持するビードガラス（１５）と、シ
ールドカップ（１６）と、導通バネ（１７）とから構成
されている。As shown in this figure, the electron gun structure (7) includes a sixth grid electrode (8), a fifth grid electrode (9), and a fourth grid electrode (10).
, third grid electrode (11), second grid electrode (12), first
It is composed of a grid electrode (13) and a cathode (14), a bead glass (15) that holds these electrodes together, a shield cup (16), and a conduction spring (17).
第６格子′這極（８）と第４格子電極（ｌＯ）とはコネ
クタ（１９ａ）で接続され、第３図に示す陽極端子（１
８）、内部導電１！ｉ （５）および導通バネ（１７）
を通じて、外部より高電圧が印加される。第５格子電極
（９）と第３格子電極（１１）とは、コネクタ（１９ｂ
）で接続され、ステム（２０）に植立てたリード線（２
１）を通じて外部より副高電圧が印加される。同様に、
第２格子電極（１２）、第１格子電極（１３）およびカ
ソード（１４）は、それぞれ図示しないがリード線（２
１）に接続されており、外部からそれぞれ所定の電圧が
印加される。The sixth grid electrode (8) and the fourth grid electrode (lO) are connected by a connector (19a), and the anode terminal (1) shown in FIG.
8), Internal conductivity 1! i (5) and conduction spring (17)
A high voltage is applied from the outside through. The fifth grid electrode (9) and the third grid electrode (11) are connected to the connector (19b
) and planted on the stem (20).
A sub-high voltage is applied from the outside through 1). Similarly,
The second grid electrode (12), the first grid electrode (13), and the cathode (14) each have a lead wire (2
1), and a predetermined voltage is applied from the outside.
第４図に示したマルチステップフォーカス形電子銃（７
）の場合、動作電圧として第３格子電極（１１）に９Ｋ
Ｖ、第２格子電極（１２）１．：数１００Ｖ（７）電圧
が印加され、両格子電極間の電位差は８ＫＶ以上もあり
、パイポテンシャル形電子銃に比較して約２倍の電位差
がある。The multi-step focus type electron gun (7
), 9K is applied to the third grid electrode (11) as the operating voltage.
V, second grid electrode (12)1. : A voltage of several 100 V (7) is applied, and the potential difference between both grid electrodes is more than 8 KV, which is about twice that of a pi-potential type electron gun.
第５図は第３格子電極（１１）、第２格子電極（１２）
、第１格子電極（１３）およびカソード（１４）を示す
一部拡大断面図で、第１格子電極（１３）の３つの孔（
２４）に対向する位置に、Ｒ，Ｇ、Ｂのカソード（１４
）が配置され、カソード（１４）の先端面には電子放出
物￥ｔ （２２）が塗布されている。また、カソード（
１４）の内側にはヒータ（２３）が挿入されている。Figure 5 shows the third grid electrode (11) and the second grid electrode (12).
, is a partially enlarged cross-sectional view showing the first grid electrode (13) and the cathode (14), and shows the three holes (
R, G, and B cathodes (14) are placed opposite the R, G, and B cathodes (14).
) is arranged, and an electron-emitting substance (22) is applied to the tip surface of the cathode (14). In addition, the cathode (
14), a heater (23) is inserted inside.
このような構成において、ヒータ（２３）に電流を流し
てカソード（１４）を加熱すると、電子放出物質（２２
）から熱゛電子が放出され、この熱電子は、第１格子電
極（１３）、第２格子電極（１２）および第３格子電極
（１１）のそれぞれの孔（２４） 、 （２５） 、
（２Ｂ）を通過して、パネル部（１）の内面に形成され
ている蛍光面（図示しない）に衝突して蛍光体を発光さ
せる。In such a configuration, when a current is passed through the heater (23) to heat the cathode (14), the electron emitting material (22) is heated.
), and the thermoelectrons are emitted from the holes (24), (25), and the holes (24), (25), and
(2B) and collides with a phosphor screen (not shown) formed on the inner surface of the panel portion (1), causing the phosphor to emit light.
［発明が解決しようとする問題点］
上述した従来の陰極線管（３０）にあっては、製造工程
中のエージング工程において、カソード（１４）の活性
化を行なうため、ヒータ（２３）には定格の２倍近くの
電圧が印加される。このためカソード（１４）の温度は
１１００℃近くまで高くなり、電子放出物質（２２）の
一部であるバリウムが蒸発し、第６図に示すように、第
１格子電極（１３）の孔（２４）や第２格子電極（１２
）の孔（２５）付近に蒸着する。この蒸着物（２７）は
ほとんどがバリウムであり、全屈の仕事関数を低くして
熱電子が出やすくなる効果を持っている。[Problems to be Solved by the Invention] In the conventional cathode ray tube (30) described above, in order to activate the cathode (14) during the aging process in the manufacturing process, the heater (23) has a rated A voltage nearly twice that is applied. As a result, the temperature of the cathode (14) increases to nearly 1100°C, barium, which is part of the electron emitting material (22), evaporates, and as shown in FIG. 24) and the second grid electrode (12
) near the hole (25). This vapor deposit (27) is mostly barium, and has the effect of lowering the total bending work function and making it easier to generate thermal electrons.
ところで、前に述べたように、第２格子電極（１２）と
第３格子電極（１１）との間には、８ＫＶ以上の電位差
があり、また、第２格子電極（１２）には、バリウムが
主成分である蒸発物（２７）が付着しており、さらにカ
ソード（１４）からの輻射熱による昇温かあるために、
第２格子電極（１２）からは熱電子が非常に出易くなっ
ている。By the way, as mentioned earlier, there is a potential difference of 8KV or more between the second grid electrode (12) and the third grid electrode (11), and the second grid electrode (12) is made of barium. Because the evaporated matter (27), which is the main component, is attached, and there is also a rise in temperature due to radiant heat from the cathode (14),
Thermionic electrons are very easily emitted from the second grid electrode (12).
しかしながら、この第２格子電極（１２）から出る電子
は、陰極線管（３Ｇ）にとっては全く不要の電子で、こ
れが原因となってテレビ画面、ディスプレイ画面の画質
が損われるという問題点があった。However, the electrons emitted from the second grid electrode (12) are completely unnecessary for the cathode ray tube (3G), and this causes a problem in that the image quality of the television screen or display screen is impaired.
この発明は、上述した従来の問題点を解決するものであ
って、不要電子放射を少なくして、良好な画質を維持で
きる陰極線管を得ることを目的としている。The present invention is intended to solve the above-mentioned conventional problems, and aims to provide a cathode ray tube that can reduce unnecessary electron emission and maintain good image quality.
［問題点を解決するための手段］
この発明に係る陰極線管は、カソードの電子放出物質が
蒸着して不要電子放射源となる格子電極に形成された電
子ビーム通過孔を、高圧側格子電極と対向する側の入口
部の曲率が低圧側格子電極と対向する側の入口部の曲率
よりも大きくなるような形状としたことを特徴としてい
る。[Means for Solving the Problems] The cathode ray tube according to the present invention replaces the electron beam passing hole formed in the grid electrode, which becomes a source of unnecessary electron radiation when the electron emitting material of the cathode is deposited, with the high voltage side grid electrode. It is characterized by a shape in which the curvature of the inlet portion on the opposing side is larger than the curvature of the inlet portion on the side opposing the low-voltage side grid electrode.
［作用］
この発明においては、電子ビーム通過孔の曲率が高圧側
で大きくなっているために、孔部における等電位線の集
中が緩和され、電界強度が弱められる。その結果、カソ
ードからの蒸発物が電子ビーム通過孔付近に付着しても
、電界強度が弱いために、格子電極からの不要電子の発
生が抑制される。[Function] In the present invention, since the curvature of the electron beam passage hole is larger on the high voltage side, the concentration of equipotential lines in the hole is relaxed, and the electric field strength is weakened. As a result, even if evaporated matter from the cathode adheres to the vicinity of the electron beam passage hole, the electric field strength is weak, so generation of unnecessary electrons from the grid electrode is suppressed.
［発明の実施例］
以下、この発明の一実施例を第１図および第２図により
説明する。[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIGS. 1 and 2.
第１図において、Ｈ）、（１２）、 （１３）は、それ
ぞれ第３格子電極、第２格子電極、第１格子電極。In FIG. 1, H), (12), and (13) are the third grid electrode, the second grid electrode, and the first grid electrode, respectively.
（ロ）はカソード、 （２２）は電子放出物質であって
、これらの配列は従来のものと変わりはないが、ここで
は第２格子電極（１２）に形成されている電子ビーム通
過孔（２８）の形状に特徴がある。(B) is a cathode, (22) is an electron-emitting material, and the arrangement of these is the same as in the conventional one, but here the electron beam passing hole (28) formed in the second grid electrode (12) is used. ) is characterized by its shape.
すなわち、第２図の拡大図に示したように、電子ビーム
通過孔（２８）は、高圧側の第３格子電極（１１）と対
向する側の入口部の曲率Ｒ１が、低圧側の第１格子電極
（１３）と対向する側の入口部の曲率Ｒ２よりも大きく
なるような形状に形成されている。That is, as shown in the enlarged view of FIG. 2, the curvature R1 of the entrance portion of the electron beam passage hole (28) on the side facing the third grid electrode (11) on the high voltage side is the same as that of the first lattice electrode (11) on the low voltage side. It is formed in a shape that is larger than the curvature R2 of the entrance portion on the side facing the grid electrode (13).
第２図において１点線（２Ｂ）は等電位線分布を表わし
ている・この図からもわかるように、第３格子電極（１
１）側から侵入する高圧の等電位線（２９）は、電子ビ
ーム通過孔（２８）の入口付近でゆるやかな分布となる
。すなわち、電子ビーム通過孔（２Ｂ）の曲率Ｒ１が高
圧側で大きくなっているために、等電位１ａ （２９）
の集中が緩和され、電界強度が弱められることとなる。In Figure 2, the one-dot line (2B) represents the equipotential line distribution.As can be seen from this figure, the third grid electrode (1
The high-voltage equipotential line (29) entering from the side 1) has a gentle distribution near the entrance of the electron beam passage hole (28). That is, since the curvature R1 of the electron beam passage hole (2B) is larger on the high voltage side, the equipotential 1a (29)
concentration is relaxed, and the electric field strength is weakened.
その結果、カソード（１０からの蒸発物が第２格子電極
（１２）の電子ビーム通過孔（２日）付近に付着しても
、電界強度が弱いために、第２格子電極（１２）からの
不要電子の発生が抑制される。As a result, even if the evaporated matter from the cathode (10) adheres to the vicinity of the electron beam passage hole (2 days) of the second grid electrode (12), the electric field strength is weak, so that the evaporated matter from the second grid electrode (12) is Generation of unnecessary electrons is suppressed.
なお、上記実施例では、マルチステップフォーカス形の
電子銃について説明したが、バイボテンシャル形、ユニ
ポテンシャル形の電子銃についてもこの発明は同様に適
用が可能であり、同様の効果が得られる。In the above embodiment, a multi-step focus type electron gun has been described, but the present invention can be similarly applied to a bipotential type or unipotential type electron gun, and similar effects can be obtained.
［発明の効果］
以上のように、この発明によれば、電子ビーム通過孔の
曲率を高圧側で大きくしたことにより、孔部の電界強度
が弱くなり、このため、カソードからの蒸発物が孔付近
に蒸着しても不要電子放射が少なく、画質の低下のない
陰極線管を得ることができる。[Effects of the Invention] As described above, according to the present invention, by increasing the curvature of the electron beam passage hole on the high pressure side, the electric field strength in the hole becomes weaker, and therefore, evaporated matter from the cathode is absorbed into the hole. It is possible to obtain a cathode ray tube with less unnecessary electron emission and no deterioration in image quality even if it is deposited nearby.
第１図はこの発明の一実施例の要部である第２格子電極
まわりの一部拡大断面図、第２図は第１図における等電
位線分布を示す拡大断面図、第３図は陰極線管の側面図
、第４図は陰極線管の電子銃構体の構成を示すネック部
の拡大断面図、第５図は電子銃構体の第２格子電極付近
の一部拡大断面図、第６図はさらにその一部拡大断面図
である。
（７）・・・電子銃構体、 （１１）・・・第３格子電
極（高圧側電極） 、 （＋２）・・・第２格子電極、
（１３）・・・第１格子電極（低圧側電極） 、 （２
８）・・・電子ビーム通過孔。
（３０）・・・陰極線管、Ｒ１，Ｒ２・・・曲率。
なお１図中、同一符号は同一または相当部分を示す。FIG. 1 is a partially enlarged sectional view of the area around the second grid electrode, which is the main part of an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing the equipotential line distribution in FIG. 1, and FIG. 3 is a cathode ray A side view of the tube, FIG. 4 is an enlarged sectional view of the neck showing the structure of the electron gun assembly of the cathode ray tube, FIG. 5 is a partially enlarged sectional view of the electron gun assembly near the second grid electrode, and FIG. Furthermore, it is a partially enlarged sectional view. (7)...Electron gun structure, (11)...Third grid electrode (high voltage side electrode), (+2)...Second grid electrode,
(13)...First grid electrode (low voltage side electrode), (2
8)...Electron beam passage hole. (30)...Cathode ray tube, R1, R2...Curvature. In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts.
Claims (2)
源となる格子電極に形成された電子ビーム通過孔を、高
圧側格子電極と対向する側の入口部の曲率が低圧側格子
電極と対向する側の入口部の曲率よりも大きくなるよう
な形状としたことを特徴とする陰極線管。(1) The electron beam passing hole formed in the grid electrode, which becomes a source of unnecessary electron radiation when the electron-emitting material of the cathode is vapor-deposited, is arranged so that the curvature of the entrance part on the side opposite to the high-voltage grid electrode faces the low-voltage grid electrode. A cathode ray tube characterized by having a shape that is larger than the curvature of the entrance portion on the side where the cathode ray tube is exposed.
格子電極である特許請求の範囲第１項記載の陰極線管。(2) The grid electrode in which the electron beam passing hole is formed is the second
The cathode ray tube according to claim 1, which is a grid electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9406386A JPS62249340A (en) | 1986-04-21 | 1986-04-21 | Cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9406386A JPS62249340A (en) | 1986-04-21 | 1986-04-21 | Cathode-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62249340A true JPS62249340A (en) | 1987-10-30 |
Family
ID=14100065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9406386A Pending JPS62249340A (en) | 1986-04-21 | 1986-04-21 | Cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62249340A (en) |
-
1986
- 1986-04-21 JP JP9406386A patent/JPS62249340A/en active Pending
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