JPS61203546A - Rotary anode for x-ray tube - Google Patents
Rotary anode for x-ray tubeInfo
- Publication number
- JPS61203546A JPS61203546A JP4265185A JP4265185A JPS61203546A JP S61203546 A JPS61203546 A JP S61203546A JP 4265185 A JP4265185 A JP 4265185A JP 4265185 A JP4265185 A JP 4265185A JP S61203546 A JPS61203546 A JP S61203546A
- Authority
- JP
- Japan
- Prior art keywords
- target plate
- rotating shaft
- section
- rotary shaft
- ray tube
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
- H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、陽極ターゲットの部分を回転させながらＸ線
を放射する回転陽極形Ｘ線管の改良に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a rotating anode X-ray tube that emits X-rays while rotating an anode target portion.
回転陽極形Ｘ線管（以下Ｘ線管という）は、陰極から射
出される高速電子を回転している陽極のターゲットの部
分に射突させることによりＸ線を発生させるものである
。そしてこの場合、ターゲットの部分は陰極から射出さ
れる高速電子の射突によって高温となり、ついには溶融
してしまうため円板状の高溶融点金属からなるターゲッ
ト板を高速回転させることによって高速電子の射突位置
を移動させ、これによって陽極の局部的の昇温を防止し
ている。A rotating anode X-ray tube (hereinafter referred to as an X-ray tube) generates X-rays by causing high-speed electrons emitted from a cathode to impinge on a rotating anode target. In this case, the target part becomes hot due to the impact of high-speed electrons emitted from the cathode, and eventually melts. Therefore, by rotating the target plate made of a disk-shaped high-melting point metal at high speed, the high-speed electrons are heated. The injection position is moved to prevent local temperature rise of the anode.
市
第１図は回転陽極型Ｘ線管を示すもので、外囲器１の一
方に陰極２が配設され、この陰極２には陰極フィラメン
ト及び集束電極を内蔵（図示せず）している。又、外囲
器１の中央付近には陰極２に対向して略傘状円板形のタ
ーゲット３が配設され、ロータ４及び回転軸５と共に軸
受６ａ、６ｂにより陽極固定部７に対し回転自在に支承
されており、通常的３０００〜９０００ｒｐｍで回転す
るようになっている。このように、陽極のターゲットの
部分を高速回転させるＸ線管は、負荷時間が約数秒以内
であるきわめて短時間のＸ線撮影に用いる場合が多く、
Ｘ線管の外局に取付けられたステータ８に電流を流し、
これによって生ずる回転磁界を用いてＸ線管内に配置さ
れ、かつターゲット板３に連結されたロータ４を回転さ
せている。このロータは通常約１秒間で規定の高速回転
に達するものであり、規定の高速回転状態において約数
秒以内の短時間のみ負荷が与えられるものである。そし
てこの短時間負荷が終了すると同時にステータ電流がし
ゃ断され、陽極のロータおよびターゲットの部分は惰性
によって約数分ないし数十分間回転を続けたのちに停止
する。Figure 1 shows a rotating anode type X-ray tube, in which a cathode 2 is disposed on one side of an envelope 1, and this cathode 2 contains a cathode filament and a focusing electrode (not shown). . Further, a substantially umbrella-shaped disk-shaped target 3 is disposed near the center of the envelope 1 to face the cathode 2, and is rotated with respect to the anode fixing part 7 by bearings 6a and 6b together with a rotor 4 and a rotating shaft 5. It is freely supported and typically rotates at 3,000 to 9,000 rpm. In this way, X-ray tubes that rotate the anode target portion at high speed are often used for extremely short-term X-ray imaging, where the loading time is within a few seconds.
A current is passed through the stator 8 attached to the outer station of the X-ray tube,
The rotating magnetic field generated thereby is used to rotate a rotor 4 disposed within the X-ray tube and connected to the target plate 3. This rotor normally reaches a specified high speed rotation in about one second, and is subjected to a load only for a short period of time, within about several seconds, in the specified high speed rotation state. As soon as this short-term load ends, the stator current is cut off, and the rotor and target portions of the anode continue to rotate for about several minutes to several tens of minutes due to inertia, and then stop.
ところで上記のような従来のＸ線管において、回転磁界
を用いてロータ４に加えられた回転トルクが回転軸５を
通じてターゲット板３に伝達されロータ４、回転軸５及
びターゲット板３が一緒に高速回転するわけである。と
ころがターゲット板３は、Ｘ線発生能力を太キくシ、か
つその際の発熱に耐えるようにするためタングステン又
はタングステンを主体とする合金を用い、あるいはそれ
らの金属に他の高融点金属を組み合わせられている。し
かも、このターゲット板３は直径及び肉厚の大きいもの
が必要とされるため、静止トルクが大きくなり、それを
短時間で高速回転する際には回転軸５とターゲット板３
０間に加えられるねじりモーメントは極めて大きなもの
となる。一方、Ｘ線管は使用目的上、陽極の回転におい
て回転部の振れ、振動９回転音ができるだけ小さく、回
転部の寿命が長く多回数の起動停止の繰り返しに耐える
ことが必要とされる。このためターゲット板３と回転軸
５の結合が強固なもので、繰り返し使用によつ−Ｃ経時
変化を生じ難いことが要求される。By the way, in the conventional X-ray tube as described above, the rotational torque applied to the rotor 4 using a rotating magnetic field is transmitted to the target plate 3 through the rotating shaft 5, and the rotor 4, rotating shaft 5, and target plate 3 all move at high speed. It rotates. However, the target plate 3 is made of tungsten or a tungsten-based alloy, or a combination of these metals with other high-melting point metals in order to increase the X-ray generation ability and withstand the heat generated. It is being Moreover, since the target plate 3 is required to have a large diameter and wall thickness, the static torque becomes large.
The torsional moment applied between zero and zero becomes extremely large. On the other hand, due to the purpose of use of the X-ray tube, it is necessary that vibrations and vibrations of the rotating part during rotation of the anode are as small as possible, and that the rotating part has a long lifespan and can withstand repeated starting and stopping many times. Therefore, it is required that the connection between the target plate 3 and the rotating shaft 5 is strong and that -C does not easily change over time due to repeated use.
ターゲット板と回転軸を結合する方法として、例えば実
開昭５３−１５１３７８号公報に開示されるように、タ
ーゲット板に回転軸を嵌合し、相互間を一定方向に固定
するため嵌合部に回転中心から偏心させた段付部を設け
、かつ回転軸端部に螺合させ九ナツトで回転軸とターゲ
ット板とを締め付は固定する方法が知られている。As a method of coupling a target plate and a rotating shaft, for example, as disclosed in Japanese Utility Model Application Publication No. 53-151378, a rotating shaft is fitted to a target plate, and a fitting part is fitted in order to fix them in a fixed direction. A method is known in which a stepped portion is provided eccentrically from the center of rotation, is screwed onto the end of the rotating shaft, and is fastened or fixed to the rotating shaft and the target plate using a nine-nut.
しかし、Ｘ線出力を増大するためターゲット板を大形と
し、これをさらに高速で回転しようとする場合には、固
定が不十分となりやすい問題があり長寿命で大出力の性
能を有するＸ線管を製作する上で限界があった。However, in order to increase the X-ray output, the target plate is made larger and when the target plate is rotated at an even higher speed, there is a problem that it tends to be insufficiently fixed. There were limitations in producing.
本発明の目的はターゲット板と回転軸とを強固に固定し
た構造を有するＸ線管用回転陽極を提供することにある
。また同時にＸ１１ｊ！発生時にターゲット板に発生し
た熱を回転軸側に伝達することを抑制し軸受の負担を軽
減して長寿命化を図ることにらる。An object of the present invention is to provide a rotating anode for an X-ray tube having a structure in which a target plate and a rotating shaft are firmly fixed. At the same time, X11j! The purpose is to suppress the heat generated in the target plate at the time of generation from being transmitted to the rotating shaft side, reduce the load on the bearing, and extend its life.
上記の目的を達成するため、本発明はＸ線管の高速回転
を行うときと回転を止めるときとでは回転トルクの生ず
る方向及び大きさが異なること、ターゲット板と回転軸
との緩みは回転方向に生じやすくその抑制が最も必要で
あるとみられることなどに注目して成されたもので、そ
の特徴はターゲット板と回転軸との嵌合部に高精度はめ
合い部と比較的緩い精度の螺合部を併設すること、かつ
回転部の一部にターゲット板のねじとは逆回転のねじを
設はナツトを螺合してターゲット板と回転軸とを締め付
は固定する構造とした点にある。In order to achieve the above object, the present invention is characterized in that the direction and magnitude of the rotational torque are different when rotating the X-ray tube at high speed and when the rotation is stopped, and that the loosening between the target plate and the rotating shaft is It was developed by paying attention to the fact that it is most likely to occur in the area where it occurs, and it is considered that it is most necessary to suppress it.The feature is that the fitting part between the target plate and the rotating shaft has a high-precision fitting part and a relatively loose precision screw thread. The joint part is also provided, and a screw that rotates in the opposite direction to the screw of the target plate is installed in a part of the rotating part, and a nut is screwed together to tighten and fix the target plate and the rotating shaft. be.
以下、本発明の一実施例を第１図により説明する。本発
明はまず、ターゲット板３と回転軸５との嵌合に際し、
Ｘ線管動作時にターゲット板３が約１．．０００Ｃの極
めて高温になるため、相互の熱膨張係数を同等にするこ
とでなされる。回転軸５としては通常の場合モリブデン
又はモリブデン合金が使用されるが、本発明では上記目
的のためターゲット板３はＸ線放射部９をＸ線放射目的
に合った材料（例えばタングステン）とし、基体部１０
の少なくとも回転軸３との嵌合部は回転軸５と同じ材料
を用いている。次にターゲット板３及び回転軸５の嵌合
部の形状寸法として、高精度はめ合い部１１と緩精度螺
合部１２とを併設する。高精度はめ合い部１１はターゲ
ット板３に設けた穴と回転軸５に設けた軸の夫々の直径
が工作加工上できるだけ高い寸法精度にし、はめ合い部
の長さはターゲット板３の肉厚の３分の１以下程度に短
くする。一方、緩精度螺合部１２はターゲット板３に設
けたねじ穴と回転軸５に設けたねじとが少しがたつく程
度の緩いはめ合いとし、例えばはめ合い部の直径方向に
すき間１３ができるようにするユねじ山はピッチが少な
くとも１順以上の大きなねじにして、ねじのはめ合いか
しつくりしていなくても、場極回転起動時の大きな回転
トルクに耐えられる寸法とする。ターゲット板３は回転
軸５に対し、少なくとも陽極回転起動トルクよりも大き
いトルクによってねじ合わせた後に、座金１４を介して
ナツト１５により締め付は固定する。回転軸５とナツト
１５との螺合部１６の部分のはめ合いは高精度でしっく
りとはめ合わせ、ねじ端部１７を潰してまわり止めをす
る。また緩精度螺合部１２とナツト螺合部１６の夫々の
ねじは互に回転方向を逆にして、陽極回転時に固定の緩
みｔｉじ難くする。そして、本実施例では緩精度螺合部
１２のねじ回転方向は、陽極回転起動力向と逆方向に形
成されている。An embodiment of the present invention will be described below with reference to FIG. In the present invention, first, when fitting the target plate 3 and the rotating shaft 5,
When the X-ray tube is in operation, the target plate 3 is approximately 1. ．． Since the temperature is extremely high at 000C, this is done by making the coefficients of thermal expansion the same. Molybdenum or a molybdenum alloy is normally used as the rotating shaft 5, but in the present invention, for the above purpose, the target plate 3 has the X-ray emitting part 9 made of a material suitable for the purpose of X-ray emission (for example, tungsten), and the base material Part 10
At least the fitting portion with the rotating shaft 3 is made of the same material as the rotating shaft 5. Next, as the shape and dimensions of the fitting portion between the target plate 3 and the rotating shaft 5, a high-precision fitting portion 11 and a loose-precision screwing portion 12 are provided together. The high-precision fitting part 11 has the diameters of the hole provided in the target plate 3 and the shaft provided in the rotating shaft 5 as high as possible for machining, and the length of the fitting part is determined by the wall thickness of the target plate 3. Shorten it to about one-third or less. On the other hand, the loose precision threaded part 12 is a loose fit that allows the screw hole provided in the target plate 3 and the screw provided in the rotating shaft 5 to play a little, for example, so that a gap 13 is created in the diametrical direction of the fitted part. The screw threads to be connected should be large screws with a pitch of at least 1 or more, and have dimensions that can withstand the large rotational torque at the start of field rotation even if the screws are not fitted together. After the target plate 3 is screwed onto the rotating shaft 5 with a torque that is at least larger than the anode rotation starting torque, the target plate 3 is tightened and fixed with a nut 15 via a washer 14. The threaded portion 16 of the rotating shaft 5 and the nut 15 is fitted tightly with high precision, and the threaded end 17 is crushed to prevent rotation. Further, the rotational directions of the screws of the loose precision threaded portion 12 and the nut threaded portion 16 are reversed to make it difficult for the fixation to loosen during rotation of the anode. In this embodiment, the screw rotation direction of the loose precision screw engagement part 12 is formed in the opposite direction to the direction of the anode rotation starting force.
第２図は他の実施例を示す。高精度はめ合い部１１を回
転軸つば部１８がターゲット板３にはまり合う形状にし
たものであり、その他は第１図の例と同様である。FIG. 2 shows another embodiment. The high-precision fitting part 11 is shaped so that the rotating shaft flange part 18 fits into the target plate 3, and the other parts are the same as the example shown in FIG.
第３図はさらに他の実施例でおる。回転軸５のつば部１
８とターゲット板３との接合部にテーバはめ合い部１９
を設け、その他は第１図と同様にしたものでらる。この
場合でも高精度はめ合い部１１とテーバはめ合い部１９
とは各々ターゲット板３の肉厚の３分の１以下程度に短
くするのが良い。ターゲット板３に段付部２０を設け、
緩精度螺合部の長さを長くとれば、ターゲット板３が大
形になった場合でも嵌合部の固定を強固にすることがで
きる。FIG. 3 shows yet another embodiment. Flange portion 1 of rotating shaft 5
A tapered fitting part 19 is provided at the joint between 8 and the target plate 3.
The other parts are the same as those shown in Fig. 1. Even in this case, the high-precision fitting portion 11 and the tapered fitting portion 19
It is preferable that each of them be shortened to about one-third or less of the wall thickness of the target plate 3. A stepped portion 20 is provided on the target plate 3,
By increasing the length of the loosely threaded portion, the fitting portion can be firmly fixed even when the target plate 3 becomes large in size.
第４図、第５図はターゲット板３について、回転軸５に
対してねじ合わせる際に大きなトルクを与えやすくする
ための補助的手段として***を設け、ねじまわし掛け２
１としたものである。穴の形状及び個数は図示の形状及
び個数に限定されないが、ターゲット板３の中心軸に対
し特定方向に良
偏らず、比例配分的に配列されていれば者い。第６図は
ターゲット板３０段付部２０に切欠き２２を設けること
により、第４図及び第５図の例と同じ役目を行うように
したものである。4 and 5 show that the target plate 3 is provided with a small hole as an auxiliary means to make it easier to apply a large torque when screwing the screw to the rotating shaft 5.
1. The shape and number of holes are not limited to the shape and number shown in the drawings, but any hole may be arranged as long as it is not biased in a particular direction with respect to the central axis of the target plate 3 and is arranged in a proportionate manner. In FIG. 6, a notch 22 is provided in the stepped portion 20 of the target plate 30 to perform the same role as the examples shown in FIGS. 4 and 5.
本発明によれば、ターゲット板と回転軸との嵌合部の固
定が強固となるので、大形で重量の太きいターゲットを
用い九Ｘ線管の製造が可能となり、また陽極回転を極め
て短時間で高速回転させるため大きな回転トルクが加え
られても多回数の使用に耐える。さらにＸ線発生時にタ
ーゲット板が赤熱しても、ターゲット板から回転軸への
熱伝導が比較的少なくなるので、回転軸を支持している
軸受の＠度上昇が抑制される結果となり、軸受の回転寿
命も長くなるなど多大の効果を奏する。According to the present invention, since the fitting part between the target plate and the rotating shaft is firmly fixed, nine X-ray tubes can be manufactured using a large and heavy target, and the anode rotation can be extremely shortened. Because it rotates at high speed over time, it can withstand repeated use even when large rotational torque is applied. Furthermore, even if the target plate becomes red hot when X-rays are generated, the heat conduction from the target plate to the rotating shaft is relatively small, which suppresses the rise in temperature of the bearing that supports the rotating shaft. It has many effects such as longer rotational life.
第１図は本発明の一実施例を示すＸ線管用回転陽極のタ
ーゲット板と回転軸との嵌合部の側面を示す断面図、第
２図、第３図は他の実施例を示す嵌合部側面断面図、第
４図はターゲット板と回転軸との嵌合部に設は九ねしま
わし掛けを示す上面図、第５図は第４図の側面断面図、
第６図はターゲット板の段付部に設けた切欠きを示す底
面図、第７図は従来のＸ線管の概略構造を示す一部断面
による側面図である。
３・・・ターゲット板、５・・・回転軸、１１・・・高
精度はめ合い部、１２・・・緩精度螺合部、１９・・・
テーバはめ合い部、２０・・・段付部、２１・・・ねじ
まわし掛け、２２・・・段付部切欠き。
−１゜第ｉ閃
第２（２）FIG. 1 is a cross-sectional view showing a side surface of a fitting portion between a target plate and a rotating shaft of a rotating anode for an X-ray tube showing one embodiment of the present invention, and FIGS. 2 and 3 show fittings showing other embodiments. Fig. 4 is a top view showing a nine-way hook installed at the fitting part between the target plate and the rotating shaft; Fig. 5 is a side sectional view of Fig. 4;
FIG. 6 is a bottom view showing a notch provided in the stepped portion of the target plate, and FIG. 7 is a partially sectional side view showing the schematic structure of a conventional X-ray tube. 3... Target plate, 5... Rotating shaft, 11... High precision fitting part, 12... Loose precision screwing part, 19...
Taper fitting part, 20...Stepped part, 21...Screwdriver hook, 22...Stepped part notch.
-1゜Ith Flash 2nd (2)
Claims (1)
略傘状円板形のターゲット板を回転軸を介してロータに
より回転させるＸ線管において、前記ターゲット板は前
記回転軸との嵌合部の材料を該回転軸の材料と同一と成
し、はめ合い部と螺合部とを併設して前記ターゲット板
と回転軸とを締結したことを特徴とするＸ線管用回転陽
極。 ２、前記ターゲット板と回転軸とに設けられたはめ合い
部は複数のはめ合い部から成り、そのうちの一つがテー
パを有すはめ合い部であることを特徴とする特許請求の
範囲第１項記載のＸ線管用回転陽極。 ３、前記ターゲット板に回転軸へ螺合のための補助手段
としての切欠きを設けたことを特徴とする特許請求の範
囲第１項記載のＸ線管用回転陽極。 ４、前記ターゲット板と回転軸との螺合部にターゲット
板の回転方向に対し逆回転ねじを形成したことを特徴と
する特許請求の範囲第１項記載のＸ線管用回転陽極。 ５、前記ターゲット板が段付部を有すことを特徴とする
特許請求の範囲第１項記載のＸ線管用回転陽極。[Scope of Claims] 1. An X-ray tube in which a cathode and a rotating anode are disposed facing each other in an envelope, and a target plate of the anode in the shape of an umbrella disk is rotated by a rotor via a rotating shaft, The target plate has a fitting portion with the rotating shaft made of the same material as the rotating shaft, and a fitting portion and a threaded portion are provided to fasten the target plate and the rotating shaft. Characteristic rotating anode for X-ray tubes. 2. Claim 1, characterized in that the fitting portion provided on the target plate and the rotating shaft is composed of a plurality of fitting portions, one of which is a fitting portion having a taper. The described rotating anode for an X-ray tube. 3. The rotating anode for an X-ray tube according to claim 1, wherein the target plate is provided with a notch as an auxiliary means for screwing into the rotating shaft. 4. The rotating anode for an X-ray tube as set forth in claim 1, wherein a thread that rotates in a direction opposite to the rotational direction of the target plate is formed in the threaded portion between the target plate and the rotating shaft. 5. The rotating anode for an X-ray tube according to claim 1, wherein the target plate has a stepped portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60042651A JPH0658793B2 (en) | 1985-03-06 | 1985-03-06 | Rotating anode for X-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60042651A JPH0658793B2 (en) | 1985-03-06 | 1985-03-06 | Rotating anode for X-ray tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61203546A true JPS61203546A (en) | 1986-09-09 |
| JPH0658793B2 JPH0658793B2 (en) | 1994-08-03 |
Family
ID=12641910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60042651A Expired - Lifetime JPH0658793B2 (en) | 1985-03-06 | 1985-03-06 | Rotating anode for X-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0658793B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118098909A (en) * | 2024-04-25 | 2024-05-28 | 昆山医源医疗技术有限公司 | Tube core assembly for X-ray tube and X-ray tube |
| CN118098909B (en) * | 2024-04-25 | 2024-07-30 | 昆山医源医疗技术有限公司 | Tube core assembly for X-ray tube and X-ray tube |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53151378U (en) * | 1977-05-04 | 1978-11-29 | ||
| JPS58102451A (en) * | 1981-12-11 | 1983-06-18 | Hitachi Ltd | Rotary-anode x-ray tube |
| JPS58123645A (en) * | 1982-01-18 | 1983-07-22 | Hitachi Ltd | Rotary anode |
-
1985
- 1985-03-06 JP JP60042651A patent/JPH0658793B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53151378U (en) * | 1977-05-04 | 1978-11-29 | ||
| JPS58102451A (en) * | 1981-12-11 | 1983-06-18 | Hitachi Ltd | Rotary-anode x-ray tube |
| JPS58123645A (en) * | 1982-01-18 | 1983-07-22 | Hitachi Ltd | Rotary anode |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118098909A (en) * | 2024-04-25 | 2024-05-28 | 昆山医源医疗技术有限公司 | Tube core assembly for X-ray tube and X-ray tube |
| CN118098909B (en) * | 2024-04-25 | 2024-07-30 | 昆山医源医疗技术有限公司 | Tube core assembly for X-ray tube and X-ray tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0658793B2 (en) | 1994-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |