JPH0664354U - Image tube - Google Patents

Image tube

Info

Publication number
JPH0664354U
JPH0664354U JP213993U JP213993U JPH0664354U JP H0664354 U JPH0664354 U JP H0664354U JP 213993 U JP213993 U JP 213993U JP 213993 U JP213993 U JP 213993U JP H0664354 U JPH0664354 U JP H0664354U
Authority
JP
Japan
Prior art keywords
vapor
tube
photocathode
wall
bulb
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
Application number
JP213993U
Other languages
Japanese (ja)
Inventor
栄俊 岸本
和之 増田
博 小山
圭一 平垣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shimadzu Corp filed Critical Shimadzu Corp
Priority to JP213993U priority Critical patent/JPH0664354U/en
Publication of JPH0664354U publication Critical patent/JPH0664354U/en
Pending legal-status Critical Current

Links

Abstract

(57)【要約】 【目的】 管の絶縁耐圧が良好で、動作の安定なイメー
ジ管を得る。 【構成】 集束電極4の表面に金(Au)被膜を蒸着し
た。
(57) [Summary] [Purpose] To obtain an image tube with a good dielectric strength and stable operation. [Structure] A gold (Au) coating was deposited on the surface of the focusing electrode 4.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

この考案は、内部に光電面(光電陰極)を備えたイメージ管、特に、絶縁対圧 を高め、動作の安定なイメージ管に関する。 The present invention relates to an image tube having a photocathode (photocathode) inside, and more particularly to an image tube having a stable operation and a high insulation counter voltage.

【0002】[0002]

【従来の技術】[Prior art]

イメージ管は、図1に示すように光電面2と、それと対向して設けられている 出力蛍光面3と、前記両者間に介在し、光電面(光電陰極)より放射された光電 子を加速集束する集束電極4、ならびに陽極5と、これらを収容する管球1とよ り構成され、光電面2と陽極5の間、ならびに集束電極4には所定の加速、集束 電圧が電源装置6により供給されている。 可視光、X線等の入力放射線像は、光電面2で光電子像に変換され、出力蛍光 面3の方向に放出された光電子は、集束電極4の静電界で集束され、且つ、陽極 5によって加速され、出力蛍光面3に輝度の増強された出力像が映出されるよう に構成されている。 As shown in FIG. 1, the image tube is disposed between the photocathode 2 and the output phosphor screen 3 facing the photocathode, and the both, and accelerates the photoelectrons emitted from the photocathode (photocathode). It is composed of a focusing electrode 4 for focusing, an anode 5 and a bulb 1 for accommodating them, and between the photocathode 2 and the anode 5 and on the focusing electrode 4 a predetermined acceleration and a focusing voltage are supplied by the power supply device 6. Is being supplied. Input radiation images such as visible light and X-rays are converted into photoelectron images by the photocathode 2, and photoelectrons emitted in the direction of the output phosphor screen 3 are focused by the electrostatic field of the focusing electrode 4 and are also converted by the anode 5. It is configured to be accelerated and an output image with enhanced brightness is displayed on the output phosphor screen 3.

【0003】 上記のようにイメージ管内に光電陰極を有する場合、セシウムCs、蒸気を製 作時の管組立後、排気工程中に管内で発生させ、光電面が蒸着形成される。 光電面の蒸着形成時、余剰のアルカリ蒸気が管球壁内面、特に、図2に示すよ うに電位傾度が高くなる電極付近の管球壁の内表面に付着する。In the case where the image tube has a photocathode as described above, cesium Cs and vapor are generated in the tube during an exhaust process after the tube is assembled during production, and a photocathode is formed by vapor deposition. During vapor deposition of the photocathode, excess alkali vapor adheres to the inner surface of the bulb wall, especially to the inner surface of the bulb wall near the electrode where the potential gradient increases as shown in FIG.

【0004】 なお、図2において・は管球内壁に付着したCs蒸気(Cs分子)を示す。In FIG. 2, · indicates Cs vapor (Cs molecule) attached to the inner wall of the tube.

【0005】 この付着したCs蒸気は、仕事関数が小さいので、離脱しやすい不安定な状態 であるために、電極に高電圧を印加した動作時に二次電子およびイオンを放出し て管内の異常放電や、管球壁を通じての沿面放電を誘発し、電子レンズを形成す る電極等の電位を不安定にし、動作を不安定にする他、放出された二次電子は、 正の加速電圧の供給されている陽極のため、出力蛍光面を刺激し、出力像の像質 を低下させる。 このために、管球内壁へのアルカリ蒸気の付着を極力減らすために光電面作成 時に用いるCs量を調節したり、エージング等によりイメージ管を加熱して、管 球内壁に付着したアルカリ蒸気を除去することにより、耐圧向上が計られている 。Since the attached Cs vapor has a small work function and is in an unstable state where it is easily released, it emits secondary electrons and ions during the operation in which a high voltage is applied to the electrode to cause an abnormal discharge in the tube. In addition, it induces a creeping discharge through the bulb wall, making the potential of the electrodes forming the electron lens unstable and making the operation unstable.In addition, the emitted secondary electrons are supplied with a positive acceleration voltage. Due to the anode, it stimulates the output phosphor screen and reduces the image quality of the output image. For this reason, in order to reduce the adhesion of alkali vapor to the inner wall of the bulb as much as possible, the amount of Cs used when creating the photocathode is adjusted, and the image tube is heated by aging or the like to remove the alkali vapor deposited on the inner wall of the bulb. By doing so, the breakdown voltage has been improved.

【0006】[0006]

【考案が解決しようとする課題】[Problems to be solved by the device]

しかしながら、前者のCs量の調整では、余剰Cs蒸気の管球内壁への付着を 避けることは実質的に困難で、また、後者のエージング等の加熱により、管球内 壁に付着したCs蒸気を活性化させて除去する方法では、Cs蒸気の管壁への再 付着が生じる。 したがって、従来の方法ではCs蒸気の管球内壁への付着が避けられず、管の 絶縁耐圧を低下させ、内部に異常放電を起こしたり、電子レンズ電極の電位を不 安定にして出力像の像質を低下させるという問題があった。 However, by adjusting the amount of Cs in the former, it is practically difficult to avoid adhesion of surplus Cs vapor to the inner wall of the bulb, and in the latter, the Cs vapor adhering to the inner wall of the bulb is heated by heating such as aging. In the method of activating and removing, Cs vapor redeposits on the tube wall. Therefore, the conventional method inevitably adheres Cs vapor to the inner wall of the tube, lowers the withstand voltage of the tube, causes abnormal discharge inside, and stabilizes the electric potential of the electron lens electrode, resulting in an image of the output image. There was a problem of degrading quality.

【0007】 この考案は上記に鑑み、管球内壁より離脱したCs蒸気が管球内壁に再付着す ることを防止し、管の絶縁耐圧を向上させ、動作の安定なイメージ管を提供する ことを目的とする。In view of the above, the present invention prevents the Cs vapor separated from the inner wall of the tube from re-adhering to the inner wall of the tube, improves the withstand voltage of the tube, and provides an image tube with stable operation. With the goal.

【0008】[0008]

【課題を解決するための手段】[Means for Solving the Problems]

本考案は上記目的を達成するために、管球内の電子レンズを構成する電極に金 (Au)被膜、または銀(Ag)被膜を形成したことを特徴とする。 In order to achieve the above object, the present invention is characterized in that a gold (Au) coating or a silver (Ag) coating is formed on an electrode forming an electron lens in a tube.

【0009】[0009]

【作用】[Action]

種々の金属被膜をCs蒸気の雰囲気中に置いて実験した所、Au被膜とAg被 膜がCs蒸気を化学的に吸着し、且つ、吸着能が高く、被膜に安定な状態で吸着 保持し、吸着したCs蒸気を再放出しないことが判った。 When various metal coatings were placed in an atmosphere of Cs vapor and tested, the Au coating and the Ag coating chemically adsorb Cs vapor, and the adsorption ability is high and the adsorption and holding of the coating in a stable state, It was found that the adsorbed Cs vapor was not re-emitted.

【0010】 したがって、電極に形成したAu被膜、または、Ag被膜は、光電面形成時の 管球内に浮遊する余剰のCs蒸気、ないし、管球内壁に付着しエージング等で活 性化し、それより離脱したCs蒸気を吸着して安定な状態に保つので、Cs蒸気 の管球内壁、ならびに電極等を支持する絶縁物への付着が防止できると共に、C s蒸気による不要な電子、イオンの放出が防止でき、管の絶縁耐圧が向上し、イ メージ管の動作が安定する。Therefore, the Au coating or Ag coating formed on the electrode is excessive Cs vapor floating in the bulb when the photocathode is formed, or adheres to the inner wall of the bulb and is activated by aging, etc. Since the more separated Cs vapor is adsorbed and kept in a stable state, it is possible to prevent the Cs vapor from adhering to the inner wall of the bulb and the insulator that supports the electrodes and the like, and to release unnecessary electrons and ions by the Cs vapor. Can be prevented, the dielectric strength of the tube is improved, and the operation of the image tube is stabilized.

【0011】[0011]

【実施例】【Example】

以下、図1に示す実施例に沿って説明する。 図1は、固定視野のイメージ管に本発明を実施したもので、1は管球、2は光 電面(光電陰極)、3は出力蛍光面、4は集束電極、5は陽極、6は電源装置、 7は集束電極4の外表面に蒸着等で形成されたAu被膜である。 Hereinafter, description will be given according to the embodiment shown in FIG. FIG. 1 shows an image tube having a fixed field of view, in which 1 is a bulb, 2 is a photocathode (photocathode), 3 is an output phosphor screen, 4 is a focusing electrode, 5 is an anode, and 6 is The power supply device 7 is an Au coating formed on the outer surface of the focusing electrode 4 by vapor deposition or the like.

【0012】[0012]

【変形実施例】[Modified Example]

図1では集束電極4の外表面にAu被膜を形成したが、集束電極4全面をAu 被膜で被覆してもよい。また、Au被膜は陽極5にも形成すれば、Cs蒸気の吸 着効率を高めることができる。 Although the Au coating is formed on the outer surface of the focusing electrode 4 in FIG. 1, the entire focusing electrode 4 may be coated with the Au coating. If the Au coating is also formed on the anode 5, the adsorption efficiency of Cs vapor can be improved.

【0013】 さらに、Au被膜を形成する電極表面をホーニング処理等で粗面化すれば被膜 の付着力が増大し、剥れることもなく、また、表面積の増大によりCs蒸気の吸 着作用を大きくできる。Further, if the electrode surface on which the Au film is formed is roughened by a honing treatment or the like, the adhesive force of the film is increased and the film is not peeled off, and the increased surface area increases the adsorption effect of Cs vapor. it can.

【0014】 さらにまた、陽極の前段に補助電極を配設し、この電極ならびに集束電極への 印加電圧を変化させて出力像の光電陰極面上の範囲を段階的、または、連続的に 変化させる可変視野イメージ管にもこの発明は適用できる。Furthermore, an auxiliary electrode is provided in front of the anode, and the voltage applied to this electrode and the focusing electrode is changed to change the range of the output image on the photocathode surface stepwise or continuously. The present invention is also applicable to variable field image tubes.

【0015】[0015]

【効果】【effect】

この考案によれば、電極に形成したAu被膜、または、Ag被膜が光電面作成 時における管球内の余剰セシウム蒸気、ならびに、管球内壁等に付着し、それよ り離脱したセシウム蒸気を吸着して安定な状態に保つので、セシウム蒸気による 不要な電子、イオンの放出が防止でき、管の絶縁耐圧を向上できるので、動作の 安定なイメージ管が得られる他、イメージ管の小型軽量化が可能となる。 According to this invention, the Au coating or Ag coating formed on the electrode adheres to the excess cesium vapor in the bulb during the photocathode fabrication, as well as to the inner wall of the bulb and the like, and the cesium vapor released therefrom is adsorbed. Since it keeps a stable state by preventing unnecessary emission of electrons and ions due to cesium vapor and improving the withstand voltage of the tube, a stable operation image tube can be obtained and the image tube can be made smaller and lighter. It will be possible.

【図面の簡単な説明】[Brief description of drawings]

【図1】本考案の一実施例の構成を示す断面図である。FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

【図2】管球内壁よりのセシウム蒸気の離脱、再付着の
説明用図である。
FIG. 2 is a diagram for explaining the separation and reattachment of cesium vapor from the inner wall of the tube.

【符号の説明】[Explanation of symbols]

1…管球 2…光電面(光電陰極)
3…出力蛍光面 4…集束電極 5…陽極 6…電源装置
7…金Au蒸着膜
1 ... Tube 2 ... Photocathode (photocathode)
3 ... Output phosphor screen 4 ... Focusing electrode 5 ... Anode 6 ... Power supply device
7 ... Gold Au deposition film

───────────────────────────────────────────────────── フロントページの続き (72)考案者 平垣 圭一 京都市中京区西ノ京桑原町1番地 株式会 社島津製作所三条工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiichi Hiragaki Creator Keiichi Hiragaki, No. 1, Kuwahara-cho, Nishinokyo, Nakagyo-ku, Kyoto Inside the Shimadzu Corporation Sanjo Factory

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 管球内の電子レンズを構成する電極の少
なくとも外表面に金、または、銀の被膜を形成したこと
を特徴とするイメージ管。
1. An image tube characterized in that a film of gold or silver is formed on at least an outer surface of an electrode constituting an electron lens in a tube.
JP213993U 1993-01-29 1993-01-29 Image tube Pending JPH0664354U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP213993U JPH0664354U (en) 1993-01-29 1993-01-29 Image tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP213993U JPH0664354U (en) 1993-01-29 1993-01-29 Image tube

Publications (1)

Publication Number Publication Date
JPH0664354U true JPH0664354U (en) 1994-09-09

Family

ID=11521012

Family Applications (1)

Application Number Title Priority Date Filing Date
JP213993U Pending JPH0664354U (en) 1993-01-29 1993-01-29 Image tube

Country Status (1)

Country Link
JP (1) JPH0664354U (en)

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