JPS62229642A - Cathode-ray tube - Google Patents
Cathode-ray tubeInfo
- Publication number
- JPS62229642A JPS62229642A JP7164386A JP7164386A JPS62229642A JP S62229642 A JPS62229642 A JP S62229642A JP 7164386 A JP7164386 A JP 7164386A JP 7164386 A JP7164386 A JP 7164386A JP S62229642 A JPS62229642 A JP S62229642A
- Authority
- JP
- Japan
- Prior art keywords
- grid electrode
- cathode
- ray tube
- electron gun
- cathode ray
- 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
- 230000005855 radiation Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 2
- 239000001257 hydrogen Substances 0.000 abstract description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052788 barium Inorganic materials 0.000 description 5
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
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２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（６）が設け
られており、この内部導電膜（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。この電子銃構体（
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３図に示す。この図に示すように電子銃構体（
７）は。[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 (6) on its inner and outer surfaces. The internal conductive film (5) extends to the inner surface of the neck (3) and is connected to the electron gun assembly (7) housed within the neck (3). This electron gun structure (
As an example of 7), the configuration of a multi-step focus type electron gun is shown in FIG. As shown in this figure, the electron gun structure (
7) Ha.
第６格子電極（８）、第５格子電極（８）、第４格子電
極（１０）、第３格子電極（１１）、第２格子電極（１
２）、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（１
５）と、シールドカップ（１Ｂ）と、導通バネ（１７）
とから構成されている。第６格子電極（８）と第４格子
電極（１０）とはコネクタ（１９ａ）で接続され、第１
図に示す陽極端子（１８）、内部導電膜（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（８）と第３格子電極（１１）とは、コ
ネクタ（１９ａ）で接続され、ステム（２０）に植立て
たリード線（２１）を通じて外部より調高電圧が印加さ
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（１７）は、それぞれ図示しない
がリード線（２１）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。第３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９ＫＶ、第２格子電極（１２）
に数１ｏｏｖの電圧が印加され、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。第４図は第３格子電極（１
１）、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。Sixth grid electrode (8), fifth grid electrode (8), fourth grid electrode (10), third grid electrode (11), second grid electrode (1
2), the first grid electrode (13), the cathode (14), and the bead glass (1) that holds these electrodes together.
5), shield cup (1B), and conduction spring (17)
It is composed of. The sixth grid electrode (8) and the fourth grid electrode (10) are connected by a connector (19a), and the first
A high voltage is applied from the outside through the anode terminal (18), internal conductive film (5), and conduction spring (17) shown in the figure. The fifth grid electrode (8) and the third grid electrode (11) are connected by a connector (19a), and a high voltage is applied from the outside through a lead wire (21) planted in the stem (20). Similarly, the second grid electrode (12), the first grid electrode (
13) and the cathode (17) are each connected to a lead wire (21) (not shown), and a predetermined voltage is applied to each from the outside. In the case of the multi-step focus type electron gun (7) shown in Fig. 3, the operating voltage is 9 KV at the third grid electrode (11), and 9 KV at the second grid electrode (12).
A voltage of several 100 volts is applied to the lattice electrode, and the potential difference between both grid electrodes is more than 8 KV, which is about twice as large as that of a pi-potential type electron gun. Figure 4 shows the third grid electrode (1
1), a partially enlarged sectional view showing the second grid electrode (12), the first grid electrode (13), and the cathode (14), showing the position facing the three holes (24) of the first grid electrode (13) To,
R,G.
Ｂのカソード頁１４）が配置され、カソード（１４）の
先端面には電子放出物質（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。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、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）に衝突して発光する。A cathode (page 14) of B is arranged, and an electron-emitting substance (22) is coated on the front end surface of the cathode (14). Furthermore, a heater (23) is inserted inside the cathode (14). In such a configuration, the heater (23)
When a current is applied to heat the cathode (14), thermoelectrons are emitted from the electron-emitting material (22), and the first grid electrode (13), second grid electrode (12), and third grid electrode (
11), the respective holes (24), (25), (
2B) and collides with a phosphor screen (not shown) formed on the inner surface of the panel portion (1) to emit light.
［発明が解決しようとする問題点］
陰極ｍ管（３０）の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５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
、金属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。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に
より熱電子が非常に出易くなっている。この第２格子電
極（１２）から出る電子は、陰極線管（３０）にとって
は全く不要の電子で、テレビ画面、ディスプレイ画面の
画質を損うという問題点があった。[Problems to be Solved by the Invention] In the aging process in the manufacturing process of the cathode m-tube (30), in order to activate the cathode (14), the heater (
23), a voltage nearly twice the rated voltage is applied. As a result, the temperature of the cathode (14) increases to nearly 1100°C, and barium, which is a part of the electron-emitting material (22), evaporates, and as shown in FIG.
24) and near the holes (25) of the second grid electrode (12). This vapor deposit (27) is mostly barium, and has the effect of lowering the work function of the metal and making it easier to generate thermal electrons. By the way, as mentioned earlier, there is a voltage of 8KV between the second grid electrode (12) and the third grid electrode (11).
In addition, the second grid electrode (12) has an evaporated substance (27) mainly composed of barium attached to it, and thermionic electrons are generated due to temperature rise due to radiant heat from the cathode (14). It comes out very easily. The electrons emitted from the second grid electrode (12) are completely unnecessary for the cathode ray tube (30), and there is a problem in that they impair the image quality of the television screen or display screen.
この発明は、以上述べた問題点の解決を目的としてなさ
れたもので、不要電子放射の少ない陰極線管を得ること
を目的とする。This invention has been made to solve the above-mentioned problems, and aims to provide a cathode ray tube that emits less unnecessary electrons.
Ｃ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、電子銃の不要電子放射源と
なる格子電極の表面に黒色層を形成したものである。Means for Solving Problem C] The cathode ray tube according to the present invention has a black layer formed on the surface of a grid electrode that serves as a source of unnecessary electron radiation of an electron gun.
［作用］
格子電極の表面に形成した黒色層は、その格子電極金属
の仕事関数を高め、カソードから蒸発しバリウムが付着
していても、その付着物からの電子放出が抑制される。[Function] The black layer formed on the surface of the grid electrode increases the work function of the grid electrode metal, and even if barium evaporates from the cathode and is deposited, electron emission from the deposit is suppressed.
［発明の実施例］
以下、この発明の一実施例を第１図により説明する。非
磁性ステンレス鋼からなる第２格子電極（１２）を、湿
潤水素雰囲気中において、１０００ ’０．６分間の熱
処理を施す。この熱処理により非磁性ステンレス鋼の成
分であるＮｌ 、Ｆ＠ 、Ｃ，の内Ｃｒが選択耐化
され、黒色の５−３酸化クロム（ＣｒｚＯ３）の黒色層
（２８）が表面に形成される。[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIG. The second grid electrode (12) made of non-magnetic stainless steel is heat treated at 1000' for 0.6 minutes in a humid hydrogen atmosphere. Through this heat treatment, Cr among Nl, F@, and C, which are components of the nonmagnetic stainless steel, is selectively made resistant, and a black layer (28) of black 5-3 chromium oxide (CrzO3) is formed on the surface.
このように黒化処理された第２格子電極（１２）を用い
て電子銃（７）を組立て、陰極線管に装着した。An electron gun (7) was assembled using the second grid electrode (12) which had been blackened in this way, and was attached to a cathode ray tube.
このようにして製作した陰極線管（３０）を試験したと
ころ、第２格子（１２）からの電子放出が発生し始める
ときの第３格子（１１）の電圧は、従来の黒化層を有し
ていない第２格子電極（１２）を有する電子銃を用いた
陰極線管の電圧が、平均１１ＫＶであるのに対して、平
均１３ＫＶと高くなり、通常の印加電圧においては、不
要電子放射の少ない陰極線管が得られた。When the cathode ray tube (30) manufactured in this way was tested, it was found that the voltage of the third grating (11) when electron emission from the second grating (12) begins to occur is lower than that of the conventional blackening layer. While the voltage of a cathode ray tube using an electron gun with a second grid electrode (12) that does not have a second grid electrode (12) is 11KV on average, the voltage is higher on average at 13KV. A tube was obtained.
このような良好な結果が得られたのは、■第２格子電極
（１３）の金属表面の仕事関数が、黒化処理によって形
成された黒色ＪＷ （２８）の影響によって高くなり、
たとえ、カソードからバリウムが蒸着しても仕事関数は
下がらない。■第２格子電極（１２）はカソード（１４
）の近傍にあり、第２格子電極（１２）（１）孔（２８
）（７）周辺は３００℃〜４ｏｏ℃になっているが、第
２格子電極（１２）の表面を黒化することにより、輻射
ロスが増大して温度が低下し、その結果、不要電子の放
出が低減するなどの理由によるものと考えられる。Such good results were obtained because: (1) the work function of the metal surface of the second grid electrode (13) was increased by the influence of the black JW (28) formed by the blackening process;
Even if barium is deposited from the cathode, the work function will not decrease. ■The second grid electrode (12) is the cathode (14
), and the second grid electrode (12) (1) hole (28
) (7) The temperature in the surrounding area is 300°C to 40°C, but by blackening the surface of the second grid electrode (12), radiation loss increases and the temperature decreases, resulting in the elimination of unnecessary electrons. This is thought to be due to reasons such as reduced emissions.
なお、上記実施例では、マルチステップフォーカス形電
子銃の第２格子電８ｉ（１２）の表面に黒化層（２８）
を形成した例について説明したが、パイポテンシャル形
、ユニポテンシャル形の電子銃のカソードからの電子放
出物質が蒸着して不要電子放射源となる格子電極につい
ても同様に適用して同様の効果が得られる。In the above embodiment, a blackening layer (28) is provided on the surface of the second grid electrode 8i (12) of the multi-step focus type electron gun.
Although we have explained an example in which the electron emission material from the cathode of a pi-potential type or unipotential type electron gun is deposited on the lattice electrode, which becomes a source of unnecessary electron emission, the same effect can be obtained by applying the same method. It will be done.
［発明の効果］
以上のようにこの発明は、電子銃の不要電子放射源とな
る格子電極の表面に、黒色層を形成して当該電極表面の
仕事関数を高めたので、カソードからの蒸発物が当該格
子電極の孔付近に蒸着しても、仕事関数の低下を防ぐこ
とが可能となり従来のものに比へて不要電子放射の少な
い陰極線管が得られる。[Effects of the Invention] As described above, in this invention, a black layer is formed on the surface of the grid electrode, which serves as a source of unnecessary electron radiation in the electron gun, and the work function of the electrode surface is increased. Even if it is deposited near the holes of the grid electrode, it is possible to prevent the work function from decreasing, resulting in a cathode ray tube that emits less unnecessary electrons than conventional ones.
第１図はこの発明の一実施例の要部である電子銃の第２
格子電極まわりの一部拡大断面図、第２図は陰極線管の
側面図、第３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４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５図はさらにその一部拡大
断面図である。
（７）・・・電子銃構体、（１２）・・・第２格子電極
（低圧電極） 、 （１４）・・・カソード、（２８）
・・・黒色層、（３０）・・・陰極線管。
なお、各図中、同一符号は同一または相当部分を示す。FIG. 1 shows the second part of the electron gun, which is the main part of an embodiment of the present invention.
FIG. 2 is a side view of the cathode ray tube; FIG. 3 is an enlarged sectional view of the neck showing the configuration of the electron gun assembly of the cathode ray tube; FIG. 4 is a partial enlarged sectional view of the electron gun assembly. FIG. 5 is a partially enlarged cross-sectional view of the vicinity of the two grid electrodes, and FIG. 5 is a further partially enlarged cross-sectional view. (7)...Electron gun structure, (12)...Second grid electrode (low voltage electrode), (14)...Cathode, (28)
...Black layer, (30)...Cathode ray tube. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (2)
出物質が蒸着して不要電子放射源となる格子電極の表面
に黒色層を形成してなる陰極線管。(1) A cathode ray tube in which, in the manufacturing process of the cathode ray tube, an electron-emitting material of the cathode is deposited to form a black layer on the surface of a grid electrode that serves as a source of unnecessary electron radiation.
である特許請求の範囲第１項記載の陰極線管。(2) The cathode ray tube according to claim 1, wherein the grid electrode having a black layer formed on its surface is a second grid electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7164386A JPS62229642A (en) | 1986-03-28 | 1986-03-28 | Cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7164386A JPS62229642A (en) | 1986-03-28 | 1986-03-28 | Cathode-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62229642A true JPS62229642A (en) | 1987-10-08 |
Family
ID=13466517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7164386A Pending JPS62229642A (en) | 1986-03-28 | 1986-03-28 | Cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62229642A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4900978A (en) * | 1987-03-23 | 1990-02-13 | Kabushiki Kaisha Toshiba | Electron gun having blackened grids used in-line type color CRT, and color CRT using the same |
-
1986
- 1986-03-28 JP JP7164386A patent/JPS62229642A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4900978A (en) * | 1987-03-23 | 1990-02-13 | Kabushiki Kaisha Toshiba | Electron gun having blackened grids used in-line type color CRT, and color CRT using the same |
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