JP3015472B2 - X-ray image tube - Google Patents
X-ray image tubeInfo
- Publication number
- JP3015472B2 JP3015472B2 JP3014340A JP1434091A JP3015472B2 JP 3015472 B2 JP3015472 B2 JP 3015472B2 JP 3014340 A JP3014340 A JP 3014340A JP 1434091 A JP1434091 A JP 1434091A JP 3015472 B2 JP3015472 B2 JP 3015472B2
- Authority
- JP
- Japan
- Prior art keywords
- alkali
- input
- evaporation source
- electrode
- ray image
- 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 - Fee Related
Links
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明はＸ線イメ−ジ管に係
り、特にその光電面の形成に関わる手段の改良に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray image tube and, more particularly, to an improvement in means relating to formation of a photoelectric surface.
【０００２】[0002]
【従来の技術】一般にＸ線イメ−ジ管は図６に示すよう
に構成され、真空外囲器１は金属部１ａ，ガラス部１ｂ
及び入力窓２からなっている。この真空外囲器１内に
は、入力側に入力窓２に対向して入力面３が配設され、
出力側に陽極５と出力面６が配設されている。更に、真
空外囲器１内の側壁に沿って複数の集束電極４ａ，４
ｂ，４ｃが設けられ、静電電子レンズ系が形成されてい
る。そして、入力面３は基板に入力蛍光体層、光電面が
順次積層形成されている。2. Description of the Related Art Generally, an X-ray image tube is constructed as shown in FIG. 6, and a vacuum envelope 1 has a metal part 1a and a glass part 1b.
And an input window 2. In the vacuum envelope 1, an input surface 3 is provided on the input side so as to face the input window 2.
An anode 5 and an output surface 6 are provided on the output side. Further, a plurality of focusing electrodes 4a, 4a are formed along the side wall in the vacuum envelope 1.
b, 4c are provided to form an electrostatic electron lens system. The input surface 3 is formed by sequentially laminating an input phosphor layer and a photoelectric surface on a substrate.
【０００３】ところで光電面を形成するには、アルカリ
金属を入力面３に形成する必要がある。アルカリ蒸発源
は管球完成後、Ｘ線イメ−ジ管内に残す場合と、取り除
く場合がある。しかし、アルカリ蒸発源は、本来、光電
面形成が終了したら不必要であり、それを管内に残すこ
とは、異物の原因となり画質に悪影響を与えたり、管内
構造が複雑になったりして好ましくない。そこで、アル
カリ蒸発源を取り除くため、従来、図７又は図８に示す
ような方法で行われている。即ち、両者共、真空外囲器
１の出力側にアルカリ蒸発源７が一体に設けられ、この
アルカリ蒸発源７に対応してアルカリ放出用電極８、９
が配設されている。図７のアルカリ放出用電極８は中空
環状の密閉された有底有蓋容器にして、底部にはアルカ
リ蒸発源に対応するアルカリ導入孔８ａが穿たれ、蓋部
にはこのアルカリ導入孔に対応する位置（周縁部に近い
位置）に円周方向に多数のアルカリ放出孔８ｂが穿たれ
ている。又、図８のアルカリ放出用電極９はやはり底部
にアルカリ蒸発源に対応するアルカリ導入孔９ａが穿た
れ、蓋部には中央にアルカリ放出孔１０が穿たれてい
る。 光電面の形成時には、アルカリ蒸発源７からのア
ルカリがアルカリ放出用電極８、９を経由して、入力面
３の入力蛍光体層上に蒸着される。そして、光電面形成
終了後、７ａの位置から切り離すことにより、Ｘ線イメ
−ジ管を完成させる。In order to form a photoelectric surface, it is necessary to form an alkali metal on the input surface 3. The alkali evaporation source may be left in the X-ray image tube after completion of the bulb, or may be removed. However, the alkali evaporation source is originally unnecessary after the formation of the photocathode, and leaving it in the tube is not preferable because it causes foreign matters and adversely affects the image quality or complicates the structure in the tube. . Therefore, in order to remove an alkali evaporation source, conventionally, a method as shown in FIG. 7 or FIG. 8 is used. That is, in both cases, an alkali evaporation source 7 is integrally provided on the output side of the vacuum envelope 1, and the alkali discharge electrodes 8, 9 corresponding to the alkali evaporation source 7 are provided.
Are arranged. The electrode 8 for discharging alkali shown in FIG. 7 is a closed container having a closed bottom with a hollow annular shape, and an alkali introduction hole 8a corresponding to an alkali evaporation source is formed at the bottom, and a lid corresponding to this alkali introduction hole is formed at the lid. A large number of alkali discharge holes 8b are drilled in the circumferential direction at positions (positions near the peripheral edge). The electrode 9 for alkali release shown in FIG. 8 is also provided with an alkali introduction hole 9a corresponding to an alkali evaporation source at the bottom and an alkali release hole 10 at the center of the lid. At the time of forming the photocathode, the alkali from the alkali evaporation source 7 is vapor-deposited on the input phosphor layer of the input surface 3 via the electrodes 8 and 9 for discharging alkali. Then, after the formation of the photocathode, the X-ray image tube is completed by separating from the position 7a.
【０００４】[0004]
【発明が解決しようとする課題】図７の従来例では、ア
ルカリ放出用電極８のアルカリ放出孔は周縁部に近い位
置にあり、そこから出て行くアルカリは最終段集束電極
４ｃと集束電極４ｂとの間の狭い通路を通らねばならな
い。図８の従来例では、アルカリ放出用電極９のアルカ
リ放出孔１０は中央部にあり、やはり狭い。従って、両
従来例共、アルカリに指向性が出来易くなるため蒸着む
らが生じ、輝度の一様性が悪くなったり画像むらが発生
したりする。この発明は、アルカリの指向性を未然に防
止して蒸着むらがなく輝度の一様性を図ったＸ線イメ−
ジ管を提供することを目的とする。In the prior art shown in FIG. 7, the alkali discharging hole of the alkali discharging electrode 8 is located at a position close to the peripheral portion, and the alkali exiting therefrom is the final focusing electrode 4c and the focusing electrode 4b. Have to go through a narrow passage between In the conventional example of FIG. 8, the alkali discharge hole 10 of the alkali discharge electrode 9 is located at the center and is also narrow. Accordingly, in both of the conventional examples, the directivity is easily formed in the alkali, so that the deposition unevenness occurs, and the uniformity of the luminance deteriorates and the image unevenness occurs. The present invention is directed to an X-ray image in which the directivity of an alkali is prevented beforehand and the uniformity of luminance is achieved without unevenness in deposition.
The purpose is to provide a tube.
【０００５】[0005]
【課題を解決するための手段】この発明は、アルカリ蒸
発源に対応して配設されているアルカリ放出用電極が中
空環状の密閉された有底有蓋容器にして、底部にはアル
カリ蒸発源に対応するアルカリ導入孔が穿たれ、蓋部に
はこのアルカリ導入孔よりも内側で円周方向に多数のア
ルカリ放出孔が穿たれ、且つ管軸上で入力面の中心と複
数の集束電極のうち出力面側に最も近い最終段集束電極
の入力側端部に対応する位置との距離をＺA とし、入力
面の最大有効視野と最終段集束電極の入力側端部とを結
ぶ直線距離をＺB とした場合、 １．１５＜ＺB ／ＺA ＜１．１７ を満足するように設定され、更に最終段集束電極から入
力面側に１つ手前の集束電極はＺB として規定される領
域よりも外側に位置するように設定されてなるＸ線イメ
−ジ管である。According to the present invention, an alkali discharging electrode disposed in correspondence with an alkali evaporation source is a closed container with a closed bottom having a hollow annular shape, and a bottom portion is provided with an alkali evaporation source. A corresponding alkali introduction hole is drilled, a number of alkali emission holes are drilled in the lid in the circumferential direction inside the alkali introduction hole, and the center of the input surface and a plurality of focusing electrodes on the tube axis. the distance between the position corresponding to the input end of the closest final stage focusing electrode on the output side and Z a, forming an input end of the maximum effective field of view and the final stage focusing electrode of the input surface
Assuming that the straight line distance is Z B , it is set so as to satisfy 1.15 <Z B / Z A <1.17, and is further input from the final-stage focusing electrode.
Ryo one front of the focusing electrode to the force side, defined as Z B
An X-ray image tube set so as to be located outside the region .
【０００６】[0006]
【作用】この発明によれば、アルカリ蒸発源からのアル
カリに指向性がなく、むらなく光電面が形成される。こ
の結果、輝度一様性が良くて画像むらが生じることがな
い。又、アルカリ蒸着に無駄がなく、アルカリも少量で
済み、作業も短時間で終る。且つ、光電面形成に不必要
なアルカリが電極、真空外囲器等に多量付着することに
よる耐電圧特性の劣化が生じることもなくなる。According to the present invention, the alkali from the alkali evaporation source has no directivity, and the photocathode is formed evenly. As a result, the brightness uniformity is good and no image unevenness occurs. In addition, there is no waste in alkali deposition, a small amount of alkali is required, and the operation is completed in a short time. In addition, the deterioration of the withstand voltage characteristics due to the large amount of alkali unnecessary for forming the photocathode adheres to the electrodes, the vacuum envelope and the like does not occur.
【０００７】[0007]
【実施例】以下、図面を参照して、この発明の一実施例
に係るＸ線イメ−ジ管を詳細に説明する。尚、この発明
は光電面の形成に関わる手段を改良したもので、これら
手段についてのみ述べることにし、従来例（図７）と同
一箇所には同一符号を付すことにする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An X-ray image tube according to an embodiment of the present invention will be described below in detail with reference to the drawings. The present invention is an improvement of the means relating to the formation of the photocathode. Only these means will be described, and the same parts as in the conventional example (FIG. 7) will be assigned the same reference numerals.
【０００８】この発明によるＸ線イメ−ジ管のアルカリ
蒸発源付近は図１に示すように構成され、真空外囲器１
内の入力側には入力面（図示せず）が配設され、出力側
に陽極５と出力面６とが配設され、更に真空外囲器１内
の側壁に沿って複数の集束電極４ａ，４ｂ，４ｃが設け
られている。但し、便宜上、この実施例では最終段集束
電極４ｃのみ図示している。更に、真空外囲器１の出力
側にアルカリ蒸発源７が一体に設けられ、このアルカリ
蒸発源７に対応してアルカリ放出用電極１１が管内に配
設されている。The X-ray image tube according to the present invention is constructed as shown in FIG.
An input surface (not shown) is disposed on the input side, an anode 5 and an output surface 6 are disposed on the output side, and a plurality of focusing electrodes 4 a are arranged along the side wall in the vacuum envelope 1. , 4b, 4c. However, for the sake of convenience, only the final-stage focusing electrode 4c is shown in this embodiment. Further, an alkali evaporation source 7 is integrally provided on the output side of the vacuum envelope 1, and an alkali discharge electrode 11 is provided in the tube corresponding to the alkali evaporation source 7.
【０００９】尚、出力面６は真空外囲器１内に直接形成
されたり、光学ガラスを介して形成されたり、又、真空
外囲器１の一部をくり抜いてオプチカルファイバが嵌合
され、このオプチカルファイバ上に形成されたりする。
又、このアルカリ蒸発源７は、光電面形成終了後は、Ｘ
線イメ−ジ管本体から切り離せば、小形なＸ線イメ−ジ
管を提供することが出来る。The output surface 6 is formed directly in the vacuum envelope 1 or through an optical glass, or a part of the vacuum envelope 1 is hollowed out and an optical fiber is fitted therein. It is formed on this optical fiber.
After the formation of the photoelectric surface, the alkali evaporation source 7
By cutting off the X-ray image tube main body, a small X-ray image tube can be provided.
【００１０】上記のアルカリ放出用電極１１は図２から
も明らかなように、中空環状の密閉された有底有蓋容器
にして、底部１１ａにはアルカリ蒸発源７に対応するア
ルカリ導入孔１２が穿たれ、蓋部１１ｂにはこのアルカ
リ導入孔１２よりも内側で円周方向に多数のアルカリ放
出孔１３が穿たれている。As is apparent from FIG. 2, the above-mentioned alkali discharging electrode 11 is a closed container with a closed bottom having a hollow annular shape. A large number of alkali discharge holes 13 are formed in the lid 11b in the circumferential direction inside the alkali introduction holes 12 in the lid portion 11b.
【００１１】そして、図１に示すように、管軸からアル
カリ蒸発源７の中心までの距離、つまり管軸からアルカ
リ導入孔１２の中心までの距離をＲA 、管軸からアルカ
リ放出孔１３の中心までの距離をＲB 、管軸から最終段
集束電極４ｃの入力側端部Ｄまでの距離をＲC とすれ
ば、ＲA ＞ＲC ＞ＲB の関係に設定されている。尚、各
アルカリ放出孔１３は、図２に示すように、いずれも同
じ大きさである。As shown in FIG. 1, the distance from the tube axis to the center of the alkali evaporation source 7, that is, the distance from the tube axis to the center of the alkali introduction hole 12 is RA , and the distance from the tube axis to the alkali discharge hole 13 is R A. Assuming that the distance to the center is R B and the distance from the tube axis to the input end D of the final-stage focusing electrode 4c is R C , the relationship R A > R C > R B is established. Each of the alkali discharge holes 13 has the same size as shown in FIG.
【００１２】更に、図３に示すように、管軸上で入力面
３の中心と複数の集束電極のうち最終段集束電極４ｃの
入力側端部Ｄに対応する位置との距離をＺAとし、入力
面３の最大有効視野と最終段集束電極４ｃの入力側端部
Ｄとの距離をＺB とした場合 、 １．１５＜ＺB ／ＺA ＜１．１
７ を満足するように設定されている。Furthermore, as shown in FIG. 3, the distance between the last stage position corresponding to the input end D of the focusing electrode 4c of the center and a plurality of focusing electrodes of the input surface 3 on the tube axis and Z A , if the distance between the input end D of the maximum effective field of view and the final stage focusing electrode 4c of the input surface 3 was Z B, 1.15 <Z B / Z a <1.1
7 is set to be satisfied.
【００１３】この場合、ＺB ／ＺA の好適値としては、
１．１６である。即ち、発明者の実験結果を示すと図４
のようになり、図中の○印が好適値、△印が許容値、×
印が従来例の値である。In this case, preferable values of Z B / Z A are:
1.16. That is, the experimental results of the inventor are shown in FIG.
In the figure, the mark ○ is a suitable value, the mark Δ is an allowable value, ×
The mark is the value of the conventional example.
【００１４】又、図３から明らかなように、最終段集束
電極４ｃの手前即ち入力側に位置する集束電極４ｂは、
ＺB の線、つまり入力面３の最大有効視野と最終段集束
電極４ｃの入力側端部Ｄとを結ぶ線上よりも、外側に位
置するように設定されている。この発明のＸ線イメ−ジ
管は、上記以外は図６のＸ線イメ−ジ管と同様構成ゆ
え、詳細な説明は省略する。（変形例）図５はアルカリ
放出用電極の変形例を示したもので、上記実施例と同様
効果が得られる。As is apparent from FIG. 3, the focusing electrode 4b located before the final-stage focusing electrode 4c, that is, on the input side,
Line Z B, i.e. than line connecting the input end D of the maximum effective field of view and the final stage focusing electrode 4c of the input face 3, are set to be located outside. The X-ray image tube of the present invention has the same configuration as that of the X-ray image tube of FIG. 6 except for the above, and a detailed description thereof will be omitted. (Modification) FIG. 5 shows a modification of the electrode for discharging alkali, and the same effect as in the above embodiment can be obtained.
【００１５】即ち、この変形例のアルカリ放出用電極１
４では、底部にアルカリ導入孔１５が複数例えば２個穿
たれ、蓋部には複数個のアルカリ放出孔の口径、例えば
大小の２個の放出孔１６、１７が設けられている。That is, the electrode 1 for discharging alkali of this modified example
In No. 4, a plurality of, for example, two alkali introduction holes 15 are drilled in the bottom portion, and the diameter of the plurality of alkali discharge holes, for example, two large and small discharge holes 16, 17 are provided in the lid portion.
【００１６】[0016]
【発明の効果】この発明によれば、アルカリ蒸発源の位
置より内側からアルカリを入力側に導き、更にアルカリ
の出口より広い位置から最終的に蒸発させているので、
アルカリに指向性がなく、むらなく光電面が形成され
る。この結果、輝度一様性が良くて画像むらが生じるこ
とない。又、アルカリ蒸着に無駄がなく、アルカリも少
量で済み、作業も短時間で終る。According to the present invention, alkali is guided to the input side from the inside of the position of the alkali evaporation source and finally evaporated from a position wider than the outlet of the alkali.
There is no directivity in the alkali, and the photocathode is formed evenly. As a result, the brightness uniformity is good and no image unevenness occurs. In addition, there is no waste in alkali deposition, a small amount of alkali is required, and the operation is completed in a short time.
【図１】この発明の一実施例に係るＸ線イメ−ジ管のア
ルカリ蒸発源付近を拡大して示す断面図。FIG. 1 is an enlarged sectional view showing the vicinity of an alkaline evaporation source of an X-ray image tube according to an embodiment of the present invention.
【図２】この発明のＸ線イメ−ジ管で用いるアルカリ放
出用電極を示す平面図。FIG. 2 is a plan view showing an alkali discharging electrode used in the X-ray image tube of the present invention.
【図３】この発明のＸ線イメ−ジ管で用いる最終段集束
電極の位置の規制を説明するための概略断面図。FIG. 3 is a schematic sectional view for explaining the regulation of the position of a final-stage focusing electrode used in the X-ray image tube of the present invention.
【図４】同じく最終段集束電極の位置の規制のデ−タを
示す特性曲線図。FIG. 4 is a characteristic curve diagram showing data for regulating the position of the final-stage focusing electrode.
【図５】この発明のＸ線イメ−ジ管で用いるアルカリ放
出用電極の変形例を示す平面図。FIG. 5 is a plan view showing a modification of the electrode for discharging alkali used in the X-ray image tube of the present invention.
【図６】一般的なＸ線イメ−ジ管の全体を示す概略断面
図。FIG. 6 is a schematic sectional view showing the whole of a general X-ray image tube.
【図７】従来のＸ線イメ−ジ管におけるアルカリ蒸発源
付近を拡大して示す断面図。FIG. 7 is an enlarged sectional view showing the vicinity of an alkali evaporation source in a conventional X-ray image tube.
【図８】他の従来のＸ線イメ−ジ管におけるアルカリ蒸
発源付近を拡大して示す断面図。FIG. 8 is an enlarged sectional view showing the vicinity of an alkali evaporation source in another conventional X-ray image tube.
１…真空外囲器、３…入力面、４ａ、４ｂ、４ｃ…集束
電極、５…陽極、６…出力面、７…アルカリ蒸発源、１
１、１４…アルカリ放出用電極、１２、１５…アルカリ
導入孔、１３、１６、１７…アルカリ放出孔。DESCRIPTION OF SYMBOLS 1 ... Vacuum envelope, 3 ... Input surface, 4a, 4b, 4c ... Focusing electrode, 5 ... Anode, 6 ... Output surface, 7 ... Alkaline evaporation source, 1
1, 14: an electrode for alkali release, 12, 15: an alkali introduction hole, 13, 16, 17 ... an alkali release hole.
Claims (1)
れ、出力側に出力面と陽極が配設され、更に上記真空外
囲器内の側壁に沿って複数の集束電極が設けられ、且つ
上記真空外囲器の出力側にアルカリ蒸発源が一体に設け
られ、更にこのアルカリ蒸発源に対応してアルカリ放出
用電極が配設されてなるＸ線イメ−ジ管において、 上記アルカリ放出用電極は中空環状の密閉された有底有
蓋容器にして、底部には上記アルカリ蒸発源に対応する
アルカリ導入孔が穿たれ、蓋部にはこのアルカリ導入孔
よりも内側で円周方向に多数のアルカリ放出孔が穿た
れ、 且つ管軸上で上記入力面の中心と上記複数の集束電極の
うち上記出力面側に最も近い最終段集束電極の入力側端
部に対応する位置との距離をＺA とし、上記入力面の最
大有効視野と上記最終段集束電極の入力側端部とを結ぶ
直線距離をＺBとした場合、 １．１５＜ＺB ／ＺA ＜１．１７ を満足するように設定され、 更に上記最終段集束電極から上記入力面側に１つ手前の
集束電極は上記ＺB として規定される領域よりも外側に
位置するように設定されてなることを特徴とするＸ線イ
メ−ジ管。An input surface is provided on an input side in a vacuum envelope, an output surface and an anode are provided on an output side, and a plurality of focusing electrodes are provided along a side wall in the vacuum envelope. An X-ray image tube, wherein an alkali evaporation source is integrally provided on the output side of the vacuum envelope, and an alkali discharge electrode is provided corresponding to the alkali evaporation source. The electrode for discharging alkali is a closed container having a closed bottom with a hollow annular shape, and an alkali introduction hole corresponding to the above-mentioned alkali evaporation source is drilled at the bottom, and the lid is arranged inside the alkali introduction hole in a circumferential direction. In the tube axis, a large number of alkali release holes are drilled, and the center of the input surface on the tube axis and the position corresponding to the input side end of the final stage focusing electrode closest to the output surface side among the plurality of focusing electrodes. distance and Z a, the outermost and maximum effective field of said input surface Connecting the input side end portion of the stage focusing electrode
Assuming that the linear distance is Z B , it is set so as to satisfy 1.15 <Z B / Z A <1.17, and the focusing electrode immediately before the input surface side from the final stage focusing electrode is X-ray Ime, characterized in that than the region defined as Z B comprising set to be positioned on the outside - di pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3014340A JP3015472B2 (en) | 1991-02-05 | 1991-02-05 | X-ray image tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3014340A JP3015472B2 (en) | 1991-02-05 | 1991-02-05 | X-ray image tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04249050A JPH04249050A (en) | 1992-09-04 |
| JP3015472B2 true JP3015472B2 (en) | 2000-03-06 |
Family
ID=11858340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3014340A Expired - Fee Related JP3015472B2 (en) | 1991-02-05 | 1991-02-05 | X-ray image tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3015472B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102064598B1 (en) * | 2018-08-17 | 2020-01-09 | 소피안(주) | Manufacturing method of wig cap base |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6049402B2 (en) * | 2012-10-31 | 2016-12-21 | 東芝電子管デバイス株式会社 | Image tube and manufacturing method thereof |
-
1991
- 1991-02-05 JP JP3014340A patent/JP3015472B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102064598B1 (en) * | 2018-08-17 | 2020-01-09 | 소피안(주) | Manufacturing method of wig cap base |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04249050A (en) | 1992-09-04 |
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