JPH04277453A - X-ray tube with rotary anode and manufacture of tube - Google Patents
X-ray tube with rotary anode and manufacture of tubeInfo
- Publication number
- JPH04277453A JPH04277453A JP3863891A JP3863891A JPH04277453A JP H04277453 A JPH04277453 A JP H04277453A JP 3863891 A JP3863891 A JP 3863891A JP 3863891 A JP3863891 A JP 3863891A JP H04277453 A JPH04277453 A JP H04277453A
- Authority
- JP
- Japan
- Prior art keywords
- anode
- ray tube
- tube
- envelope
- exhaust pipe
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000011261 inert gas Substances 0.000 claims abstract description 11
- 238000009423 ventilation Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 206010044625 Trichorrhexis Diseases 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
Landscapes
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は回転陽極型Ｘ線管およ
びその製造方法に係り、特にその２分割された外囲器単
体の接合方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating anode type X-ray tube and a method for manufacturing the same, and more particularly to an improvement in a method for joining two separate envelopes.
【０００２】0002
【従来の技術】一般に、Ｘ線管は例えばＸ線診断として
医療用等に利用されているが、胃の検診などの場合には
、従来、図３に示すようなＸ線管が用いられている。[Prior Art] Generally, X-ray tubes are used for medical purposes, such as X-ray diagnosis, but conventionally an X-ray tube as shown in Fig. 3 has been used for stomach examinations. There is.
【０００３】このＸ線管は、いわゆる回転陽極型といわ
れるもので、ガラス製真空外囲器１内に陰極２と陽極タ
ーゲット３が対向して配設されている。そして、陰極２
には熱電子を放出する陰極フィラメント及び集束電極を
内蔵した電子放射部４が偏心して設けられている。陽極
ターゲット３は略傘状にして支持柱５を一体に介して回
転円筒６に連結されている。この回転円筒６は、真空外
囲器１の外部に配設されたステータ（図示せず）が発生
する回転磁界を受けて回転力を生じるもので、ステータ
と共に誘導電動機を構成している。回転円筒６の内側に
は、軸心に沿って回転軸７が設けられ、この回転軸７の
一端は回転円筒６に固着されている。この回転軸７と回
転円筒６との間には、有底筒状の陽極固定部材８が同軸
的に配設され、その底部８ａ近傍が封着リング９、１０
を介して真空外囲器１の端部に固定されている。尚、こ
の陽極固定部材８は底部８ａが管外つまり大気側に露出
しており、陽極端子を兼ねてＸ線管全体をＸ線管収容容
器等に支持固定する部材をなしている。更に、陽極固定
部材８と回転軸７との間には、２組のボールベアリング
１１、１２が介在配設され、回転軸７が回転可能になっ
ている。通常、このボールベアリング１１、１２は、い
ずれも高速度工具鋼のような硬質の内輪レース、多数の
ボール、及び外輪レースによって構成されている。そし
て、これら相互間の潤滑性能を高め且つ素材の摩滅を低
減するため、ボールの表面にＰｂやＡｇのような固体潤
滑材が付着されている。符合１３は排気管である。This X-ray tube is of a so-called rotating anode type, and has a cathode 2 and an anode target 3 disposed facing each other in a vacuum envelope 1 made of glass. And cathode 2
An electron emitting section 4 having a built-in cathode filament and a focusing electrode for emitting thermoelectrons is eccentrically provided. The anode target 3 has a substantially umbrella shape and is connected to a rotating cylinder 6 via a supporting column 5 integrally. The rotating cylinder 6 generates a rotational force by receiving a rotating magnetic field generated by a stator (not shown) disposed outside the vacuum envelope 1, and together with the stator constitutes an induction motor. A rotating shaft 7 is provided inside the rotating cylinder 6 along the axis, and one end of the rotating shaft 7 is fixed to the rotating cylinder 6. A bottomed cylindrical anode fixing member 8 is disposed coaxially between the rotating shaft 7 and the rotating cylinder 6, and sealing rings 9, 10 are attached near the bottom 8a of the anode fixing member 8.
It is fixed to the end of the vacuum envelope 1 via. The bottom portion 8a of this anode fixing member 8 is exposed to the outside of the tube, that is, to the atmosphere, and serves as an anode terminal as well as a member for supporting and fixing the entire X-ray tube to an X-ray tube housing container or the like. Further, two sets of ball bearings 11 and 12 are interposed between the anode fixing member 8 and the rotating shaft 7, so that the rotating shaft 7 can rotate. Normally, both ball bearings 11 and 12 are composed of a hard inner race made of high-speed tool steel, a large number of balls, and an outer race. A solid lubricant such as Pb or Ag is attached to the surface of the ball in order to improve the lubrication performance between them and reduce wear on the materials. Reference numeral 13 is an exhaust pipe.
【０００４】このような回転陽極型Ｘ線管を製造するに
当たっては、先ず図４に示すようにガラス製の真空外囲
器１が陰極側と陽極側の外囲器単体１Ａ、１Ｂに２分割
された状態で、それぞれに陰極２と陽極ターゲット３、
回転円筒６、陽極固定部材８等を収容固定し、次に両外
囲器単体１Ａ、１Ｂの分割端面を高温バーナーで溶着す
る。その際、陰極２と陽極ターゲット３、回転円筒６、
陽極固定部材８等の各温度が上がるため、その酸化を防
止する目的と、溶着部に適度な内圧を与えるために、排
気管１３からＮ２ 等の不活性ガスを吹き込みながら溶
着している。In manufacturing such a rotating anode type X-ray tube, first, as shown in FIG. 4, a glass vacuum envelope 1 is divided into two, into cathode side and anode side single envelopes 1A and 1B. In this state, the cathode 2 and anode target 3 are connected to each other.
The rotating cylinder 6, the anode fixing member 8, etc. are accommodated and fixed, and then the divided end faces of both the single envelopes 1A and 1B are welded using a high temperature burner. At that time, the cathode 2, the anode target 3, the rotating cylinder 6,
Since the temperature of the anode fixing member 8 and the like rises, welding is performed while blowing an inert gas such as N2 through the exhaust pipe 13 in order to prevent oxidation and to apply an appropriate internal pressure to the welded portion.
【０００５】[0005]
【発明が解決しようとする課題】以上説明した従来技術
によると、次のような不都合がある。SUMMARY OF THE INVENTION The prior art described above has the following disadvantages.
【０００６】即ち、一般にガラス溶着用として水素ー酸
素バーナーが使用されるが、分割端面の微小な間隙から
バーナー炎が真空外囲器１内に入り込み、内部に水蒸気
が発生し、その一部は排気管１３から吹き込まれた不活
性ガスと一緒に管外へ排出されるが、内部へ残留した分
は溶着後に内部部品が冷えるに従い、その表面に露結し
、真空部品としての品質を大幅に劣化させ、Ｘ線管とし
ては耐電圧の低下といった問題を発生し易い欠点がある
。That is, a hydrogen-oxygen burner is generally used for glass welding, but the burner flame enters the vacuum envelope 1 through a minute gap between the split ends, and water vapor is generated inside, some of which is It is discharged outside the tube together with the inert gas blown from the exhaust pipe 13, but as the internal parts cool down after welding, dew condenses on the surface of the internal parts, which significantly deteriorates the quality of the vacuum parts. It has the disadvantage that it tends to deteriorate and cause problems such as a decrease in withstand voltage as an X-ray tube.
【０００７】この発明は、以上のような不都合を解決す
るものであり、２分割した外囲器単体を完全に溶着した
後も、不活性ガスの流通を十分に維持することにより、
内部残留水蒸気を低減して管内部品の露結を防止した回
転陽極型Ｘ線管およびその製造方法を提供することを目
的とする。[0007] This invention solves the above-mentioned inconveniences by maintaining sufficient flow of inert gas even after the two divided envelopes are completely welded together.
It is an object of the present invention to provide a rotating anode type X-ray tube that reduces internal residual water vapor and prevents dew condensation on tube internal parts, and a method for manufacturing the same.
【０００８】[0008]
【課題を解決するための手段】この発明は、内部に陰極
が収容された第１の外囲器単体と内部に陽極ターゲット
、回転体、およびこれらを回転自在に支持し一部が大気
側に露出した固定体が収容された第２の外囲器単体とが
溶着により接合されてなり、更に固定体に真空側と大気
側を導通する通気孔が設けられ、この通気孔は栓により
気密に閉塞されてなる回転陽極型Ｘ線管である。[Means for Solving the Problems] The present invention provides a single first envelope in which a cathode is housed, an anode target and a rotating body inside, and a rotatable support for these, with a part exposed to the atmosphere. The exposed fixing body is joined to the second envelope housing it by welding, and the fixing body is further provided with a ventilation hole that communicates between the vacuum side and the atmosphere side, and this ventilation hole is made airtight by a plug. It is a closed rotating anode type X-ray tube.
【０００９】又、この発明は、内部に陰極が収容される
と共に端部に排気管が突出した第１の外囲器単体と内部
に陽極ターゲット、回転体、および固定体が収容される
と共に該固定体の一部が大気側に露出した第２の外囲器
単体とを溶着により接合する場合、予め固定体の一部に
通気孔を設け、第１および第２の外囲器単体の溶着の際
とその直後の電極冷却時に、排気管（又は通気孔）から
管内に不活性ガスを導入して通気孔（又は排気管）から
排出し、その後、この通気孔を気密に塞ぎ、その後、管
内を排気する回転陽極型Ｘ線管の製造方法である。[0009] Furthermore, the present invention provides a single first envelope in which a cathode is housed and an exhaust pipe protrudes from the end; an anode target, a rotating body, and a fixed body are housed therein; When joining the second envelope unit with a part of the stationary body exposed to the atmosphere by welding, a ventilation hole is provided in a part of the stationary body in advance, and the first and second envelope units are welded together. During and immediately after cooling the electrode, an inert gas is introduced into the tube from the exhaust pipe (or vent) and exhausted from the vent (or exhaust pipe), and then this vent is hermetically closed, and then, This is a method for manufacturing a rotating anode type X-ray tube that exhausts the inside of the tube.
【００１０】0010
【作用】この発明によれば、真空外囲器の溶着時に、排
気管から吹き込んだ活性ガスを陽極固定部材の底部に設
けられた通気孔から内部の残留水蒸気も同時に排出させ
ることが出来、その結果、管内部品の表面露結を確実に
防止することが出来る。[Function] According to the present invention, when welding the vacuum envelope, the active gas blown from the exhaust pipe can simultaneously discharge the residual water vapor inside from the vent provided at the bottom of the anode fixing member. As a result, surface condensation on pipe internal parts can be reliably prevented.
【００１１】[0011]
【実施例】以下、図面を参照して、この発明の一実施例
を詳細に説明する。この発明による回転陽極型Ｘ線管は
図１に示すように構成され、従来例（図３および図４）
と同一箇所は同一符号を付すことにする。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The rotating anode type X-ray tube according to the present invention is constructed as shown in FIG. 1, and the conventional example (FIGS. 3 and 4)
The same parts are given the same symbols.
【００１２】即ち、固定体である陽極固定部材８の底部
付近には、管軸に直交する方向に透孔１４が穿たれ、こ
の透孔１４に連通して更に管軸方向に通気孔１５が穿た
れている。この通気孔１５は陽極固定部材８の大気側に
露出した底部８ａを貫通しているため、当然、透孔１４
および通気孔１５を通じて管内は大気側と通じている。
そして、後述の製造方法において所定の工程を経た後は
、通気孔１５は栓１６により気密に塞がれる。符合１７
はＸ線管固定用のねじ孔である。尚、この発明による回
転陽極型Ｘ線管は、上記以外は従来例（図３）と同様構
成ゆえ、詳細な説明は省略する。さて次に、この発明の
回転陽極型Ｘ線管の製造方法について述べる。That is, near the bottom of the anode fixing member 8, which is a fixed body, a through hole 14 is bored in a direction perpendicular to the tube axis, and a ventilation hole 15 is further connected to the through hole 14 in the tube axis direction. It's worn. Since this ventilation hole 15 penetrates the bottom part 8a of the anode fixing member 8 exposed to the atmosphere, it is natural that the through hole 15
The inside of the pipe communicates with the atmosphere through the vent hole 15. After a predetermined step in the manufacturing method described below, the vent hole 15 is hermetically closed with a plug 16. sign 17
is a screw hole for fixing the X-ray tube. The rotary anode type X-ray tube according to the present invention has the same configuration as the conventional example (FIG. 3) except for the above, so a detailed explanation will be omitted. Next, a method for manufacturing a rotating anode type X-ray tube according to the present invention will be described.
【００１３】この発明の回転陽極型Ｘ線管も、従来技術
と同じく図２に示すように真空外囲器１は、予め、陽極
側と陽極側の外囲器単体１Ａ、１Ｂに２分割されている
。そして、図２に示すように、内部に陰極２が収容され
ると共に端部に排気管１３を突出した第１の外囲器単体
１Ａと、内部に回転体である陽極ターゲット３、回転円
筒６、および固定体である陽極固定部材８等が収容され
ると共に端部に陽極固定部材８の底部８ａが露出した第
２の外囲器単体１Ｂとを高温バーナーを使用して溶着に
より接合し、１つの真空外囲器１にする。この場合、既
述のように予め陽極固定部材８の底部８ａに通気孔１５
を設け、両外囲器単体１Ａ、１Ｂの溶着の際とその直後
の電極冷却時に、排気管１３から管内に不活性ガスを導
入して通気孔１５から排出する。その後、電極が完全に
冷えた状態で、図１に示すように通気孔１５を栓１６に
より気密に塞いだ後、排気工程で管内を排気する。
尚、管内に不活性ガスを導入し排出するのは、上記と逆
に通気孔１５から不活性ガスを導入して排気管１３から
排出しても良い。[0013] In the rotating anode type X-ray tube of the present invention, as shown in FIG. 2, the vacuum envelope 1 is preliminarily divided into two parts 1A and 1B on the anode side and on the anode side, as shown in the prior art. ing. As shown in FIG. 2, there is a first envelope unit 1A in which the cathode 2 is housed and an exhaust pipe 13 protruding from the end thereof, an anode target 3 which is a rotating body, and a rotating cylinder 6. , and a second envelope unit 1B in which the anode fixing member 8 and the like as a fixing body are accommodated and the bottom 8a of the anode fixing member 8 is exposed at the end are joined by welding using a high temperature burner, into one vacuum envelope 1. In this case, as described above, the ventilation hole 15 is provided in the bottom 8a of the anode fixing member 8 in advance.
An inert gas is introduced into the pipe from the exhaust pipe 13 and discharged from the vent hole 15 during welding of the single envelopes 1A and 1B and during electrode cooling immediately thereafter. Thereafter, after the electrode has completely cooled down, the vent hole 15 is hermetically sealed with a stopper 16 as shown in FIG. 1, and the inside of the tube is evacuated in an exhaust process. Note that the inert gas may be introduced into the pipe and discharged from the exhaust pipe 13 by introducing the inert gas from the vent hole 15 and discharging it from the exhaust pipe 13 in the opposite manner to the above.
【００１４】[0014]
【発明の効果】この発明によれば、固定体に真空側と大
気側を導通する通気孔が設けられ、製造時には第１およ
び第２の外囲器単体の溶着の際とその直後の電極冷却時
に、排気管（又は通気孔）から管内に不活性ガスを導入
して通気孔（又は排気管）から排出させながら第１およ
び第２の外囲器単体を溶着出来るので、内部の残留水蒸
気も同時に排出させることが出来、その後、通気孔を栓
で気密に塞いでいる。この結果、管内部品の表面露結を
防止することが出来る。According to the present invention, the fixed body is provided with a ventilation hole that communicates between the vacuum side and the atmosphere side, and during manufacturing, the electrodes are cooled during welding of the first and second envelopes and immediately after welding. Sometimes, the first and second envelopes can be welded together while introducing an inert gas into the pipe from the exhaust pipe (or vent) and discharging it from the vent (or exhaust pipe), so that residual water vapor inside can also be welded. They can be discharged at the same time, and then the vent hole is sealed airtight with a plug. As a result, dew condensation on the surfaces of pipe internal parts can be prevented.
【図１】この発明の一実施例に係る回転陽極型Ｘ線管を
示す断面図。FIG. 1 is a sectional view showing a rotating anode X-ray tube according to an embodiment of the present invention.
【図２】この発明の一実施例に係る回転陽極型Ｘ線管の
製造方法を示す正面図。FIG. 2 is a front view showing a method for manufacturing a rotating anode X-ray tube according to an embodiment of the present invention.
【図３】従来の回転陽極型Ｘ線管を示す断面図。FIG. 3 is a sectional view showing a conventional rotating anode X-ray tube.
【図４】従来の回転陽極型Ｘ線管の製造方法を示す正面
図。FIG. 4 is a front view showing a conventional method for manufacturing a rotating anode X-ray tube.
１…真空外囲器、１Ａ…第１の外囲器単体、１Ｂ…第２
の外囲器単体、２…陰極、３…陽極ターゲット、６…回
転円筒、８…陽極固定部材、８ａ…陽極固定部材の底部
、１３…排気管、１５…通気孔、１６…栓。1...Vacuum envelope, 1A...First envelope alone, 1B...Second
2... Cathode, 3... Anode target, 6... Rotating cylinder, 8... Anode fixing member, 8a... Bottom of anode fixing member, 13... Exhaust pipe, 15... Ventilation hole, 16... Plug.
Claims (2)
単体と内部に陽極ターゲット、回転体、およびこれらを
回転自在に支持し一部が大気側に露出した固定体が収容
された第２の外囲器単体とが溶着により接合されてなる
回転陽極型Ｘ線管において、上記固定体に真空側と大気
側を導通する通気孔が設けられ、この通気孔は栓により
気密に閉塞されてなることを特徴とする回転陽極型Ｘ線
管。[Claim 1] A single first envelope in which a cathode is housed, an anode target, a rotating body, and a fixed body that rotatably supports these and is partially exposed to the atmosphere. In a rotary anode X-ray tube in which a second envelope is joined by welding, a ventilation hole is provided in the fixed body to communicate the vacuum side and the atmosphere side, and this ventilation hole is hermetically closed with a plug. A rotating anode type X-ray tube characterized by:
排気管が突出した第１の外囲器単体と内部に陽極ターゲ
ット、回転体、および固定体が収容されると共に該固定
体の一部が大気側に露出した第２の外囲器単体とを溶着
により接合する回転陽極型Ｘ線管の製造方法において、
予め上記固定体の一部に通気孔を設け、上記第１および
第２の外囲器単体の溶着の際とその直後の電極冷却時に
、上記排気管（又は上記通気孔）から管内に不活性ガス
を導入して上記通気孔（又は上記排気管）から排出し、
その後、この通気孔を気密に塞ぎ、その後、管内を排気
することを特徴とする回転陽極型Ｘ線管の製造方法。2. A single first envelope in which a cathode is housed and an exhaust pipe protrudes from the end thereof; an anode target, a rotating body, and a fixed body are housed therein, and one part of the fixed body; In a method for manufacturing a rotating anode type X-ray tube, the rotary anode X-ray tube is joined by welding to a second envelope unit whose portion is exposed to the atmosphere,
A ventilation hole is provided in a part of the fixed body in advance, and an inert gas is inserted into the pipe from the exhaust pipe (or the ventilation hole) when the first and second envelopes are welded together and when the electrodes are cooled immediately thereafter. Introducing gas and discharging it from the vent (or the exhaust pipe),
A method for manufacturing a rotating anode X-ray tube, which comprises: thereafter, airtightly closing the ventilation hole, and then evacuating the inside of the tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3863891A JPH04277453A (en) | 1991-03-05 | 1991-03-05 | X-ray tube with rotary anode and manufacture of tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3863891A JPH04277453A (en) | 1991-03-05 | 1991-03-05 | X-ray tube with rotary anode and manufacture of tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04277453A true JPH04277453A (en) | 1992-10-02 |
Family
ID=12530787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3863891A Pending JPH04277453A (en) | 1991-03-05 | 1991-03-05 | X-ray tube with rotary anode and manufacture of tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04277453A (en) |
-
1991
- 1991-03-05 JP JP3863891A patent/JPH04277453A/en active Pending
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