JPS58209044A - X-ray tube - Google Patents
X-ray tubeInfo
- Publication number
- JPS58209044A JPS58209044A JP57091210A JP9121082A JPS58209044A JP S58209044 A JPS58209044 A JP S58209044A JP 57091210 A JP57091210 A JP 57091210A JP 9121082 A JP9121082 A JP 9121082A JP S58209044 A JPS58209044 A JP S58209044A
- Authority
- JP
- Japan
- Prior art keywords
- focusing body
- focal point
- target
- ray tube
- electron beam
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
- H01J35/153—Spot position control
Abstract
Description
【発明の詳細な説明】
本発明は耐電圧特性を向上させた比較的微小焦点の回転
陽極Ｘ線管に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating anode X-ray tube with a relatively small focus and improved withstand voltage characteristics.
第１図は従来の回転陽極Ｘ線管を示し、１は回転＠極の
ターゲット、１′は回転駆動力を生ずるロータ、２は電
子ビームを放出、集束させる集束体、２′は陰極部、３
はパルプである。この様なＸ線管は、所望の硬いＸ線を
放射するには＠陽極間に高電圧を印加しなければならな
いが、この高電圧に耐え管内放電が生じないようにする
ためには。FIG. 1 shows a conventional rotating anode X-ray tube, where 1 is a rotating @pole target, 1' is a rotor that generates rotational driving force, 2 is a focusing body that emits and focuses an electron beam, 2' is a cathode part, 3
is pulp. In order for such an X-ray tube to emit the desired hard X-rays, a high voltage must be applied between the anodes, but in order to withstand this high voltage and prevent internal discharge from occurring.
まず管内を高真空に排気しなげればならない。First, the inside of the tube must be evacuated to a high vacuum.
周知の如く、排気作業では、単に管内の大気を除去する
（もし排気作業がこれだゆですめば極めて容易である）
だけでなく、管内高真空に接する各部材に吸着、吸蔵さ
れている気体（時には例えば酸化物などの形をとってい
る場合もある）な除去するのに多大の努力を払い、一般
にはそれらの部材を高温に加熱して行う。特にターゲッ
ト１には実使用時にも高電圧で加速された高速電子ビー
ムが射突するので、射突局部は非常な高温となり、一般
にはターゲット全体の温度も連続使用により例えば１，
０ＯＯＣ程度の高温に達する。As is well known, the exhaust work simply removes the atmosphere inside the pipe (it would be extremely easy if the exhaust work was just boiling).
In addition, great efforts are made to remove gases (sometimes in the form of oxides, etc.) that are adsorbed or occluded in each member that comes into contact with the high vacuum inside the tube, and in general, these gases are removed. This is done by heating the component to a high temperature. In particular, target 1 is bombarded with high-speed electron beams accelerated by high voltage even during actual use, so the local area where it hits reaches a very high temperature, and generally the temperature of the entire target increases due to continuous use, e.g.
It reaches a high temperature of about 0OOC.
実使用時にはＸ線管は絶縁油に満されたＸＩＩ管容器内
に格納されているのに対し、排気作業は大気中で行なわ
れるから、排気時にターゲット加熱用に印加する電圧は
、一般に実使用時の印加電圧より低い。微小焦点仕様の
管ではその仕様上フィラメント寸法が小さく、排気時（
作業効率上、作業時間も余り長くできないので）ターゲ
ットの温度を十分高めるだけの電子流ケ得ることは困難
である。微小焦点管で電子流を増加するには、ａ）フィ
ラメント温度を上げる。ｂ）集束体とターゲット間の距
離嘔・短（して電界強度な強くする。ｃ）集束体とター
ゲット間の印加電圧を高くする。などが考えられるが、
それぞれ問題がある。ａ）の場合は、フィラメント材の
Ｗ自体の蒸装置が多くなりフィラメント寿命が短くなり
、同時にパルプ内面へのＷ蒸着層が増加して耐電圧特性
を劣化させ、更に高密度電子流に射突されてターゲツト
面が荒れ易い。ｂ）の場合、集束体とターゲットとの距
離な短くすると、排気時より高い実使用時の印加電圧に
対し管内耐電圧上問題が生ずる恐れがある。また焦点仕
様上設計的に集束体とターゲットとの距離には制約があ
る。Ｃ）の場合は、排気中の大気中でのｔ球の絶縁耐電
圧ＪＰ２排気装置の絶縁、管内ガス放出に伴う放電現象
による管球破損の恐れがある。During actual use, the X-ray tube is stored in an XII tube container filled with insulating oil, but the exhaust operation is performed in the atmosphere, so the voltage applied for target heating during exhaust is generally the same as that used in actual use. lower than the applied voltage at In tubes with microfocus specifications, the filament size is small due to its specifications, and when exhausted (
(For reasons of work efficiency, the working time cannot be too long) It is difficult to obtain enough electron flow to sufficiently raise the temperature of the target. To increase electron flow in a microfocus tube, a) increase the filament temperature. b) Increase the distance between the focusing body and the target (and increase the electric field strength). c) Increase the applied voltage between the focusing body and the target. etc. are possible, but
Each has their own problems. In the case of a), the number of evaporators for the W itself in the filament material shortens the filament life, and at the same time, the W evaporation layer on the inner surface of the pulp increases, deteriorating the withstand voltage characteristics, and further impinging on the high-density electron flow. The target surface is likely to become rough. In the case of b), if the distance between the focusing body and the target is shortened, a problem may arise in terms of withstand voltage within the tube with respect to the applied voltage during actual use, which is higher than that during evacuation. Furthermore, due to the focus specification, there are design restrictions on the distance between the focusing body and the target. In the case of C), there is a risk of damage to the tube due to the insulation of the JP2 exhaust system and the discharge phenomenon caused by gas discharge inside the tube.
本発明の目的は上記の如き問題がなく、微小焦点で耐電
圧特性良好な回転陽極Ｘ線管な提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating anode X-ray tube that does not have the above-mentioned problems, has a fine focus, and has good withstand voltage characteristics.
上記目的な達成するために本発明においては、陰極部に
、微小焦点に電子ビームを集束させる集束体の他に、こ
の集束体から管軸の周り［９０度以上離して、排気時に
回転陽極を加熱するだめの電子ビームを放出、集束させ
る補助集束体を付加して設けた。In order to achieve the above object, in the present invention, in addition to a focusing body that focuses the electron beam to a minute focus, the cathode part is provided with a rotating anode at a distance of 90 degrees or more around the tube axis from the focusing body, and a rotating anode is provided at the time of evacuation. An auxiliary focusing body was additionally provided to emit and focus the electron beam for heating.
第２図は本発明一実施例の側面図、第３図は同実施例説
明用のターゲット平面図である。図中。FIG. 2 is a side view of an embodiment of the present invention, and FIG. 3 is a plan view of a target for explaining the embodiment. In the figure.
４は補助集束体、 Ｒ，は管軸から本来の集束体ｆいた
る半径、Ｒ２は補助集束体にいたる半径、■、１は本来
の集束体とターゲット間距離、Ｒ２は補助集束体とター
ゲット間距離、Ａは本来の集束体の焦点軌跡、Ｂは補助
集束体の焦点軌跡である。補助集束体に内蔵するフィラ
メントは低電圧でもターゲソ）ｆ十分加熱可能な電子流
の得られる寸法仕様（例えば焦点寸法０．８ ｉｔｌ
’以上と大き、い）とし、又、 Ｒ，へＲ，２（Ｒ，＞
Ｒ２）、Ｌｌ←Ｌｔ（Ｌ＋≦Ｌ２）とする。4 is the auxiliary focusing body, R is the radius from the tube axis to the original focusing body f, R2 is the radius to the auxiliary focusing body, ■, 1 is the distance between the original focusing body and the target, R2 is the distance between the auxiliary focusing body and the target The distance, A is the focal trajectory of the original focusing body, and B is the focal trajectory of the auxiliary focusing body. The filament built into the auxiliary focusing body can be targeted even at low voltages) f Dimensional specifications that provide sufficient heating electron flow (e.g. focal size 0.8 itl)
``greater than or equal to ``), and R, to R,2(R, >
R2), and Ll←Lt (L+≦L2).
以上説明したように本発明によれば、排気時には大焦点
の補助集束体の電子流で加熱するので。As explained above, according to the present invention, heating is performed by the electron flow of the large focus auxiliary focusing body during exhaust.
適正なフィラメント温度でターゲノトナ十分加熱できて
、フィラメントからのＷ蒸発は少なく耐電圧特性劣化は
生ぜず、また２個の集束体からの電子ビームのターゲッ
ト上の焦点軌跡をずらしておくことによりターゲット表
面荒れｔ低減し、Ｘ線量の低減防止やｔ球寿命延長がは
かれる。The target can be heated sufficiently at an appropriate filament temperature, W evaporation from the filament is small, and there is no deterioration of withstand voltage characteristics.Also, by shifting the focal loci of the electron beams from the two focusing bodies on the target, the target surface can be heated. It reduces roughness, prevents reduction in X-ray dose, and extends the life of the T-bulb.
第１図は従来の回転陽極Ｘ線管の側面図、第２図は本発
明一実施例の側面図、第３図は同実施例のターゲット平
面図である。
１・・・ターゲット、２・・・本来の微小焦点集束体、
３・・・バルブ、４・・・大焦点排気用補助集束体。
代理人 弁理士 薄 １）利、幸、２１．°ｊ
′パ′・た、シン
第 １ 図FIG. 1 is a side view of a conventional rotating anode X-ray tube, FIG. 2 is a side view of an embodiment of the present invention, and FIG. 3 is a plan view of a target of the same embodiment. 1...Target, 2...Original minute focusing body,
3... Valve, 4... Auxiliary focusing body for large focal point exhaust. Agent Patent Attorney Susuki 1) Toshi, Yuki, 21. °j ′Pa′・ta,shin Figure 1
Claims (1)
他に、この集束体から管軸の周りに９０度以上離して、
排気時に回転＠極を加熱するための電子ビームを放出、
集束させる補助集束体を付加して設げたことな特徴とす
るＸ線管。[Claims] A rotating anode X-ray tube with a relatively small focus specification. In addition to the focusing body that focuses the electron beam to a minute focus in the cathode part, there is also a focusing body placed at least 90 degrees away from this focusing body around the tube axis.
Emit an electron beam to heat the rotating @ pole during exhaust,
An X-ray tube characterized in that it is additionally provided with an auxiliary focusing body for focusing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57091210A JPS58209044A (en) | 1982-05-31 | 1982-05-31 | X-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57091210A JPS58209044A (en) | 1982-05-31 | 1982-05-31 | X-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58209044A true JPS58209044A (en) | 1983-12-05 |
Family
ID=14020053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57091210A Pending JPS58209044A (en) | 1982-05-31 | 1982-05-31 | X-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58209044A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007149601A (en) * | 2005-11-30 | 2007-06-14 | Hitachi Medical Corp | X-ray tube and the x-ray inspection device using it |
| JP2017064392A (en) * | 2015-09-30 | 2017-04-06 | 東芝メディカルシステムズ株式会社 | X-ray computer tomography apparatus and x-ray tube device |
-
1982
- 1982-05-31 JP JP57091210A patent/JPS58209044A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007149601A (en) * | 2005-11-30 | 2007-06-14 | Hitachi Medical Corp | X-ray tube and the x-ray inspection device using it |
| JP2017064392A (en) * | 2015-09-30 | 2017-04-06 | 東芝メディカルシステムズ株式会社 | X-ray computer tomography apparatus and x-ray tube device |
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