JPH0785401B2 - Image tube cathode structure - Google Patents
Image tube cathode structureInfo
- Publication number
- JPH0785401B2 JPH0785401B2 JP58160313A JP16031383A JPH0785401B2 JP H0785401 B2 JPH0785401 B2 JP H0785401B2 JP 58160313 A JP58160313 A JP 58160313A JP 16031383 A JP16031383 A JP 16031383A JP H0785401 B2 JPH0785401 B2 JP H0785401B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- spacer
- grid electrode
- cup
- cathode structure
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は、第２格子電極、第３格子電極と陰極との間の
漏洩電流を抑制し、ビーム電流の減少を防止した撮像管
陰極構体に関する。Description: FIELD OF THE INVENTION The present invention relates to an image pickup tube cathode assembly in which leakage current between the second and third lattice electrodes and the cathode is suppressed and the beam current is prevented from decreasing. .
〔発明の背景〕 撮像管は、比較的小さい管内に多数の電極よりなる電子
銃を備え、陰極や第１格子電極と、其の他の電極との間
の電位差勾配はかなり大きい。BACKGROUND OF THE INVENTION An image pickup tube includes an electron gun including a large number of electrodes in a relatively small tube, and a potential difference gradient between a cathode or a first grid electrode and other electrodes is considerably large.
また、面板近傍はは、排気時にも十分高温に出来ないな
どの制約があるので、排気に際し分解して多量のガスを
発生する酸化物陰極などからのガスが陰極ステムなどに
取りつけた排気管の方へ容易に流れて極力排気が完全に
行われるように、陰極を取り囲んで配置されているＣ−
Ｇスペーサ（第１格子電極と陰極との距離を正確に定め
且つ保持させるもの）やG1カップ（カップのような形状
なのでカップと称するが第１格子電極となる）には、そ
れぞれ、ガス抜き孔が、周囲に例えば120度おきに３個
ずつ設けてある。In addition, the vicinity of the face plate has restrictions such as not being able to reach a sufficiently high temperature even during exhaust, so that gas from an oxide cathode that decomposes during exhaust to generate a large amount of gas, etc. C-which is placed around the cathode so that it can easily flow toward one side and exhaust as completely as possible.
Each of the G spacer (which accurately determines and maintains the distance between the first grid electrode and the cathode) and the G 1 cup (which is called a cup because it has a shape like a cup serves as the first grid electrode) are respectively degassed. For example, three holes are provided around the periphery every 120 degrees.
従来は、此のガス抜き孔を通る流路の排気コンダクタン
スを大きくするためと、更には極めて狭い陰極と第１格
子電極の間隙寸法を目視確認するためもあつて、ガス抜
き孔位置を略一直線上に揃えて、即ちこれらの孔を通し
て陰極が見えるように、組み立てていた。Conventionally, the position of the gas vent hole should be roughly adjusted in order to increase the exhaust conductance of the flow path passing through the gas vent hole, and also to visually check the gap size between the extremely narrow cathode and the first grid electrode. They were assembled in line, with the cathode visible through these holes.
しかし、上記の如く組み立てた撮像管では、陰極と、第
２格子電極や第３格子電極など陰極に対して近距離に位
置して、しかもかなり高い陽電位にある電極との間の漏
洩電流が大きくなり、撮像管として最も大切な、面板を
走査して信号電流を発生させる為のビーム電流を十分採
り難いという問題があつた。However, in the image pickup tube assembled as described above, leakage current between the cathode and electrodes such as the second lattice electrode and the third lattice electrode, which are located at a short distance from the cathode and which are at a considerably high positive potential, are generated. However, there is a problem that it is difficult to obtain a sufficient beam current for generating a signal current by scanning the face plate, which is the most important as an image pickup tube.
本発明の目的は上記第２格子電極や第３格子電極と、陰
極との間の漏洩電流を小さく抑制できる撮像管陰極構体
を提供することにある。It is an object of the present invention to provide an image pickup tube cathode assembly capable of suppressing leakage current between the second grid electrode or the third grid electrode and the cathode to be small.
上記目的を達成するために本発明においては、Ｃ−Ｇス
ペーサ及びG1カツプにそれぞれ設けたガス抜き孔を、こ
れらの孔を通して陰極を見ることが出来ないような位置
に配置した。これは、これらの孔を通して陰極が見え
る、即ち、これらの孔が略一直線上に配置された状態で
は、近くに存在し、陰極に対してかなり高い陽電位のあ
る第2,第３格子電極による電界の陰極に対する影響が大
きくなり、そのために陰極から放出される電子の少なか
らざる部分が漏洩電流になつてしまうものと考えられる
からである。In the present invention in order to achieve the above object, the gas vent holes formed respectively in the C-G spacer and G 1 cup was placed in a position which can not be able to see the cathode through these holes. This is due to the fact that the cathode is visible through these holes, that is, when these holes are arranged in a substantially straight line, they are located close to each other and have a considerably high positive potential with respect to the second and third grid electrodes. It is considered that the influence of the electric field on the cathode becomes large, and as a result, a considerable portion of the electrons emitted from the cathode becomes a leakage current.
第１図は本発明の一実施例の要部側面図である。G1カツ
プ１の内側に、Ｃ−Ｇスペーサ２と陰極３が存在してい
る。G1カツプ１とＣ−Ｇスペーサ２には、それぞれ、ガ
ヌ抜き孔5,6が設けられている。なお、４は陰極のスリ
ーブである。FIG. 1 is a side view of an essential part of an embodiment of the present invention. Inside the G 1 cup 1 are a CG spacer 2 and a cathode 3. The G 1 cup 1 and the C-G spacer 2 are provided with gunholes 5 and 6, respectively. Reference numeral 4 is a cathode sleeve.
図示の如く、ガヌ抜き孔5,6を通して陰極が見えないよ
うに組み立てると、陽電位格子電極の、陰極から放出さ
れる電子に対する電界の影響が小さくなり、漏洩電流が
減少した。これらの孔が120度おきに３個ずつ設けられ
ている場合にはガス抜き孔5,6の位置が互いに60度ずつ
ずれていることが望ましいが、余り神経質になる必要は
無い。As shown in the drawing, when the cathode was assembled so as not to be seen through the holes 5 and 6, the effect of the electric field on the electrons emitted from the cathode of the positive potential grid electrode was reduced, and the leakage current was reduced. When three holes are provided at intervals of 120 degrees, it is desirable that the positions of the gas vent holes 5 and 6 are deviated from each other by 60 degrees, but it is not necessary to be nervous.
以上説明したように本発明によれば、第2,第３格子電極
への漏洩電流が抑制されて、ビーム電流の減少を防止で
きる効果がある。As described above, according to the present invention, there is an effect that the leakage current to the second and third lattice electrodes is suppressed and the reduction of the beam current can be prevented.
第１図は本発明−実施例の要部側面図である。 １……G1カツプ、２……Ｃ−Ｇスペーサ、３……陰極、
４……スリーブ、５……G1カツプのガス抜き孔、６……
Ｃ−Ｇスペーサのガス抜き孔。FIG. 1 is a side view of a main portion of the present invention-embodiment. 1 …… G 1 cup, 2 …… CG spacer, 3 …… cathode,
4 …… Sleeve, 5 …… G 1 cup gas vent, 6 ……
Gas vent hole for CG spacer.
Claims (1)
確に定め且つ保持させるためのＣ−Ｇスペーサと、この
スペーサの周囲を囲み、第２格子電極に対抗する第１格
子電極となるG1カップとよりなる撮像管電子銃の陰極構
体において、Ｃ−Ｇスペーサ及びG1カップのそれぞれの
側壁に設けたガス抜き孔を、これらの孔を通して陰極を
見ることが出来ないような位置に配置したことを特徴と
する撮像管陰極構体。1. A cathode, a CG spacer for accurately determining and maintaining the distance between the cathode and the first grid electrode, and a first grid electrode surrounding the spacer and facing the second grid electrode. in a more composed camera tube electron gun cathode structure of G 1 cup to be, such as a gas vent hole provided in the respective side walls of the C-G spacer and G 1 cup, can not be seen cathode through the holes An image pickup tube cathode structure characterized by being placed in a position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58160313A JPH0785401B2 (en) | 1983-09-02 | 1983-09-02 | Image tube cathode structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58160313A JPH0785401B2 (en) | 1983-09-02 | 1983-09-02 | Image tube cathode structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6054140A JPS6054140A (en) | 1985-03-28 |
| JPH0785401B2 true JPH0785401B2 (en) | 1995-09-13 |
Family
ID=15712253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58160313A Expired - Lifetime JPH0785401B2 (en) | 1983-09-02 | 1983-09-02 | Image tube cathode structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0785401B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48102938U (en) * | 1972-03-09 | 1973-12-03 | ||
| JPS5142755U (en) * | 1974-09-20 | 1976-03-30 |
-
1983
- 1983-09-02 JP JP58160313A patent/JPH0785401B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6054140A (en) | 1985-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ATE53705T1 (en) | CATHODE RAY TUBE AND COLOR INDICATOR. | |
| US6184614B1 (en) | Color cathode ray tube | |
| JPH0785401B2 (en) | Image tube cathode structure | |
| JPS645419B2 (en) | ||
| KR100201762B1 (en) | Color cathode ray tube with enhanced focus | |
| JP3153597B2 (en) | Color picture tube | |
| JPS58192252A (en) | Cathode-ray tube device | |
| JPH0721938A (en) | Color cathode-ray tube | |
| JPS59127346A (en) | color picture tube electron gun | |
| JPH0139187B2 (en) | ||
| KR950003512B1 (en) | Coma correction color TV display tube | |
| KR100224978B1 (en) | Electron gun for cathode ray tube | |
| JPS6023936A (en) | Cathode ray tube | |
| JP2574331Y2 (en) | In-line type color CRT | |
| JPH0612998A (en) | Electron gun for color CRT | |
| JPS5816131Y2 (en) | unitized electron gun | |
| US2771564A (en) | Radiation generation system for electronic radiation valves with ionic trap | |
| KR900001050B1 (en) | Electron gun of crt | |
| JPH01197944A (en) | In-line electron gun | |
| JPS6048858B2 (en) | cathode ray tube electron gun | |
| KR930001183B1 (en) | Electron gun for cathode-ray tube | |
| JPH0221540A (en) | Electron gun for microwave tube | |
| JPH0127252Y2 (en) | ||
| JPH05251011A (en) | Color picture tube | |
| JPH01186540A (en) | Electron gun |