JP2012015045A

JP2012015045A - Planar filament for x-ray tube and x-ray tube

Info

Publication number: JP2012015045A
Application number: JP2010152873A
Authority: JP
Inventors: Tatsuya Yoshizawa; 辰也吉澤
Original assignee: Shimadzu Corp
Current assignee: Shimadzu Corp
Priority date: 2010-07-05
Filing date: 2010-07-05
Publication date: 2012-01-19
Anticipated expiration: 2030-07-05
Also published as: JP5370292B2

Abstract

PROBLEM TO BE SOLVED: To provide a planar filament capable of generating thermoelectrons which can form focuses of multiple sizes while using a single planar filament, and to provide an X-ray tube using this planar filament.SOLUTION: A planar filament 13a comprises a first electron emission surface 31, a first leg 41 for energization, a second leg 42 for energization, a second electron emission surface 32 arranged on the side of the first electron emission surface 31 and connected thereto on the first end side, a third leg 43 for energization, a third electron emission surface 33 arranged on the side of the first electron emission surface 31 on the reverse side to the second electron emission surface 32 and connected to the first electron emission surface 31 on the second end side, and a fourth leg 44 for energization.

Description

この発明は、Ｘ線管用平板フィラメントおよびＸ線管に関する。 The present invention relates to a flat filament for an X-ray tube and an X-ray tube.

医療用のＸ線撮影装置に使用されるＸ線管は、電子ビームを発生させる陰極と、この陰極から発生した電子ビームが衝突することによりＸ線を発生させる陽極とを備える。そして、陰極には、電子放出面と、この電子放出面に接続された一対の通電用脚部とを有する平板フィラメントが使用される（特許文献１および特許文献２参照）。 An X-ray tube used in a medical X-ray imaging apparatus includes a cathode that generates an electron beam and an anode that generates X-rays when the electron beam generated from the cathode collides. A flat filament having an electron emission surface and a pair of current-carrying legs connected to the electron emission surface is used for the cathode (see Patent Document 1 and Patent Document 2).

図５は、このような従来の平板フィラメント７１の概要図である。 FIG. 5 is a schematic view of such a conventional flat filament 71.

この平板フィラメント７１は、二箇所の屈曲部を有する電子放出面７２と、この電子放出面７２に接続された一対の通電用脚部７３、７４とを備える。この平板フィラメント７１においては、一対の通電用脚部７３、７４は、図５に示す破線部において直角に曲げられた状態で集束電極に取り付けられる。 The flat filament 71 includes an electron emission surface 72 having two bent portions, and a pair of energization legs 73 and 74 connected to the electron emission surface 72. In the flat filament 71, the pair of current-carrying legs 73 and 74 are attached to the focusing electrode in a state of being bent at a right angle at the broken line portion shown in FIG.

図６は、特許文献２に記載された平板フィラメント７５の概要図である。 FIG. 6 is a schematic diagram of a flat filament 75 described in Patent Document 2. As shown in FIG.

この平板フィラメント７５は、そのライフタイムをより長くするためのものであり、同心円状の形状を有する複数の領域からなる電子放出面７６と、この電子放出面７６に接続された一対の通電用脚部７７、７８とを備える。この平板フィラメント７５においても、一対の通電用脚部７７、７８は、図６に示す破線部において直角に曲げられた状態で集束電極に取り付けられる。 The flat filament 75 is for extending the lifetime, and includes an electron emission surface 76 composed of a plurality of regions having a concentric shape, and a pair of current-carrying legs connected to the electron emission surface 76. Parts 77 and 78. Also in the flat filament 75, the pair of energizing legs 77 and 78 are attached to the focusing electrode in a state of being bent at a right angle at the broken line portion shown in FIG.

特開平５−６７４４２号公報JP-A-5-67442 米国特許６１１５４５３号明細書US Pat. No. 6,115,453

上述した平板フィラメントを使用したＸ線管においては、平板フィラメントにおける電子放出面の大きさに対応した一定のサイズの焦点しか得られなかった。このため、このような平板フィラメントを使用した場合においては、複数の焦点寸法をもつＸ線管を実現することは困難である。 In the X-ray tube using the above-mentioned flat filament, only a fixed focal point corresponding to the size of the electron emission surface of the flat filament was obtained. For this reason, when such a flat filament is used, it is difficult to realize an X-ray tube having a plurality of focal dimensions.

一方、医療用のＸ線撮影装置においては、Ｘ線撮影を行う被検体によって、その焦点寸法を変更することが好ましい。すなわち、例えば、細部の撮影を実行する場合には焦点寸法を小さくすることが好ましく、一方、体厚の厚い被検体の撮影を実行する場合や、陽極に対する負荷を小さくして撮影を実行する場合においては、焦点寸法を大きくすることが好ましい。 On the other hand, in a medical X-ray imaging apparatus, it is preferable to change the focal dimension depending on the subject to perform X-ray imaging. That is, for example, when performing detailed imaging, it is preferable to reduce the focal size. On the other hand, when imaging a subject with a large body thickness, or when performing imaging while reducing the load on the anode In this case, it is preferable to increase the focal dimension.

このため、単一のＸ線管内に複数のフィラメントを配設したＸ線管も使用されているが、その構成が複雑となるという問題がある。また、陰極および陽極を内部に収容する外囲器を備え、陽極が外囲器と一体となって回転する外囲器回転型のＸ線管においては、フィラメントを陽極および外囲器の回転中心に配置する必要があることから、フィラメントを設置すべき位置は一箇所のみであり、複数のフィラメントを配設することはできないという問題も生ずる。 For this reason, an X-ray tube in which a plurality of filaments are arranged in a single X-ray tube is also used, but there is a problem that the configuration becomes complicated. In an envelope rotating type X-ray tube having an envelope that accommodates a cathode and an anode therein, and the anode rotates integrally with the envelope, the filament is the center of rotation of the anode and the envelope. Therefore, there is also a problem that a plurality of filaments cannot be arranged because only one position is required to install the filament.

この発明は上記課題を解決するためになされたものであり、単一の平板フィラメントを使用しながら複数のサイズの焦点を形成できる熱電子を発生することが可能な平板フィラメントおよびこの平板フィラメントを使用したＸ線管を提供することを目的とする。 The present invention has been made to solve the above-mentioned problems, and uses a flat filament capable of generating thermoelectrons capable of forming focal points of a plurality of sizes while using a single flat filament, and the flat filament. An object of the present invention is to provide an X-ray tube.

請求項１に記載の発明は、第１の電子放出面と、前記第１の電子放出面における第１の端部側に接続された第１の通電用脚部と、前記第１の電子放出面における前記第１の端部とは逆側の第２の端部側に接続された第２の通電用脚部と、前記第１の電子放出面の側方に配設され、前記第１の電子放出面と前記第１の端部側で接続された第２の電子放出面と、前記第２の電子放出面に対し、前記第２の端部側に接続された第３の通電用脚部と、前記第１の電子放出面における前記第２の電子放出面とは逆側の側方に配設され、前記第１の電子放出面と前記第２の端部側で接続された第３の電子放出面と、前記第３の電子放出面に対し、前記第１の端部側に接続された第４の通電用脚部とを備えたことを特徴とする。 According to the first aspect of the present invention, a first electron emission surface, a first current-carrying leg connected to a first end side of the first electron emission surface, and the first electron emission A second current-carrying leg connected to a second end side opposite to the first end of the surface, and a side of the first electron-emitting surface. A second electron emission surface connected to the electron emission surface of the first end portion side, and a third current-carrying connection connected to the second end portion side with respect to the second electron emission surface. A leg portion is disposed on a side opposite to the second electron emission surface of the first electron emission surface, and is connected to the first electron emission surface and the second end side. A third electron emission surface and a fourth current-carrying leg connected to the first end side with respect to the third electron emission surface are provided.

請求項２に記載の発明は、請求項１に記載の発明において、前記第２の電子放出面における前記第１の電子放出面との接続部付近、および、前記第３の電子放出面における前記第１の電子放出面との接続部付近には、熱伝導が小さくなる放熱領域が形成されている。 According to a second aspect of the present invention, in the first aspect of the invention, in the vicinity of a connection portion of the second electron emission surface with the first electron emission surface, and in the third electron emission surface. In the vicinity of the connection portion with the first electron emission surface, a heat dissipation region that reduces heat conduction is formed.

請求項３に記載の発明は、請求項２に記載の発明において、前記放熱領域は、前記第２の電子放出面および前記第３の電子放出面に形成された孔部を有する領域である。 According to a third aspect of the present invention, in the second aspect of the present invention, the heat dissipation region is a region having holes formed in the second electron emission surface and the third electron emission surface.

請求項４に記載の発明は、請求項１乃至請求項３のいずれかに記載の発明において、前記第２の電子放出面における前記第１の電子放出面とは逆側の側方に配設され、前記第２の電子放出面と前記第２の端部側で接続された第４の電子放出面と、前記第４の電子放出面に対し、前記第１の端部側に接続された第５の通電用脚部と、前記第３の電子放出面における前記第１の電子放出面とは逆側の側方に配設され、前記第３の電子放出面と前記第１の端部側で接続された第５の電子放出面と、前記第５の電子放出面に対し、前記第２の端部側に接続された第６の通電用脚部とをさらに備える。 The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the second electron emission surface is disposed on a side opposite to the first electron emission surface. A fourth electron emission surface connected to the second electron emission surface on the second end side, and connected to the first end side with respect to the fourth electron emission surface. A fifth current-carrying leg and a third electron-emitting surface disposed on a side opposite to the first electron-emitting surface, the third electron-emitting surface and the first end portion; A fifth electron emission surface connected on the side, and a sixth current-carrying leg connected to the second end side with respect to the fifth electron emission surface.

請求項５に記載の発明は、請求項４に記載の発明において、前記第４の電子放出面における前記第２の電子放出面との接続部付近、および、前記第５の電子放出面における前記第３の電子放出面との接続部付近には、熱伝導が小さくなる放熱領域が形成されている。 According to a fifth aspect of the present invention, in the fourth aspect of the invention, in the vicinity of a connection portion between the fourth electron emission surface and the second electron emission surface, and in the fifth electron emission surface. In the vicinity of the connection portion with the third electron emission surface, a heat dissipation region that reduces heat conduction is formed.

請求項６に記載の発明は、請求項５に記載の発明において、前記放熱領域は、前記第４の電子放出面および前記第５の電子放出面に形成された孔部を有する領域である。 The invention according to claim 6 is the invention according to claim 5, wherein the heat dissipation region is a region having holes formed in the fourth electron emission surface and the fifth electron emission surface.

請求項７に記載の発明は、平板フィラメントを有し電子ビームを発生させる陰極と、前記陰極から発生した電子ビームが衝突することによりＸ線を発生させる陽極と、を備えたＸ線管において、前記平板フィラメントは、第１の電子放出面と、前記第１の電子放出面における第１の端部側に接続された第１の通電用脚部と、前記第１の電子放出面における前記第１の端部とは逆側の第２の端部側に接続された第２の通電用脚部と、前記第１の電子放出面の側方に配設され、前記第１の電子放出面と前記第１の端部側で接続された第２の電子放出面と、前記第２の電子放出面に対し、前記第２の端部側に接続された第３の通電用脚部と、前記第１の電子放出面における前記第２の電子放出面とは逆側の側方に配設され、前記第１の電子放出面と前記第２の端部側で接続された第３の電子放出面と、前記第３の電子放出面に対し、前記第１の端部側に接続された第４の通電用脚部とを備えるとともに、前記第１、第２の通電用脚部と、前記第３、第４の通電用脚部とに対して選択的に加熱電流を供給する加熱電流供給部を備えたことを特徴とする。 The invention according to claim 7 is an X-ray tube comprising a cathode having a flat filament and generating an electron beam, and an anode generating X-rays by collision of an electron beam generated from the cathode. The flat filament includes a first electron emission surface, a first current-carrying leg connected to a first end of the first electron emission surface, and the first electron emission surface. A second current-carrying leg connected to the second end opposite to the first end, and a side of the first electron-emitting surface, and the first electron-emitting surface A second electron emission surface connected on the first end side, and a third energization leg connected on the second end side with respect to the second electron emission surface, The first electron emission surface is disposed on a side opposite to the second electron emission surface, and the first electron emission surface and A third electron emission surface connected on the second end side, and a fourth current-carrying leg connected on the first end side with respect to the third electron emission surface. And a heating current supply section that selectively supplies a heating current to the first and second energization legs and the third and fourth energization legs. .

請求項８に記載の発明は、電子ビームを発生させる陰極と、前記陰極から発生した電子ビームが衝突することによりＸ線を発生させる陽極と、前記陰極から発生した電子ビームを偏向させることにより当該電子ビームが前記陽極と衝突する焦点の位置を制御する偏向コイルと、前記陰極および前記陽極を内部に収容する外囲器とを備え、前記陽極が前記外囲器と一体となって回転する外囲器回転型のＸ線管において、前記平板フィラメントは、第１の電子放出面と、前記第１の電子放出面における第１の端部側に接続された第１の通電用脚部と、前記第１の電子放出面における前記第１の端部とは逆側の第２の端部側に接続された第２の通電用脚部と、前記第１の電子放出面の側方に配設され、前記第１の電子放出面と前記第１の端部側で接続された第２の電子放出面と、前記第２の電子放出面に対し、前記第２の端部側に接続された第３の通電用脚部と、前記第１の電子放出面における前記第２の電子放出面とは逆側の側方に配設され、前記第１の電子放出面と前記第２の端部側で接続された第３の電子放出面と、前記第３の電子放出面に対し、前記第１の端部側に接続された第４の通電用脚部と、を備えるとともに、前記第１、第２の通電用脚部と、前記第３、第４の通電用脚部とに対して選択的に加熱電流を供給する加熱電流供給部を備えたことを特徴とする。 According to an eighth aspect of the present invention, there is provided a cathode for generating an electron beam, an anode for generating X-rays by collision of the electron beam generated from the cathode, and deflecting the electron beam generated from the cathode. A deflection coil for controlling the position of a focal point where the electron beam collides with the anode; and an envelope for accommodating the cathode and the anode therein, and the anode rotates integrally with the envelope. In the envelope rotation type X-ray tube, the flat filament includes a first electron emission surface, and a first current-carrying leg connected to a first end portion side of the first electron emission surface; A second energization leg connected to a second end opposite to the first end of the first electron emission surface; and a side of the first electron emission surface. And is in contact with the first electron emission surface on the first end side. The second electron-emitting surface formed, the third current-carrying leg connected to the second end side with respect to the second electron-emitting surface, and the first electron-emitting surface in the first electron-emitting surface. A third electron emission surface disposed on a side opposite to the second electron emission surface and connected to the first electron emission surface and the second end side; and the third electron emission And a fourth energizing leg connected to the first end side with respect to the surface, the first and second energizing legs, and the third and fourth energizing legs. A heating current supply unit that selectively supplies a heating current to the legs is provided.

請求項１に記載の発明によれば、第１、第２の通電用脚部と、第３、第４の通電用脚部とに対して選択的に加熱電流を供給することにより、異なる寸法の焦点を形成できる熱電子を発生することが可能となる。このため、単一のフィラメントを使用しながら異なる焦点寸法でＸ線を照射するＸ線管を実現することが可能となる。 According to the first aspect of the present invention, different dimensions can be obtained by selectively supplying a heating current to the first and second energizing legs and the third and fourth energizing legs. It is possible to generate thermoelectrons that can form a focal point. Therefore, it is possible to realize an X-ray tube that irradiates X-rays with different focal dimensions while using a single filament.

請求項２に記載の発明によれば、熱伝導が小さくなる放熱領域の作用により、第１、第２の通電用脚部に通電を行ったときに、第１の電子放出面に生じた熱エネルギーが第２の電子放出面および第３の電子放出面に逃げる割合を減少させることが可能となる。 According to the second aspect of the present invention, the heat generated in the first electron emission surface when the first and second current-carrying legs are energized by the action of the heat dissipation region where the heat conduction is reduced. It is possible to reduce the rate at which energy escapes to the second electron emission surface and the third electron emission surface.

請求項３に記載の発明によれば、焦点形状を変化させることなく、第１の電子放出面に生じた熱エネルギーが第２の電子放出面および第３の電子放出面に逃げる割合を減少させることが可能となる。 According to the third aspect of the present invention, the rate at which the thermal energy generated on the first electron emission surface escapes to the second electron emission surface and the third electron emission surface is reduced without changing the focal shape. It becomes possible.

請求項４に記載の発明によれば、第１、第２の通電用脚部と、第３、第４の通電用脚部と、第５、第６の通電用脚部とに対して選択的に加熱電流を供給することにより、異なる三種類の寸法の焦点を形成できる熱電子を発生することが可能となる。このため、単一のフィラメントを使用しながら異なる三種類の焦点寸法でＸ線を照射するＸ線管を実現することが可能となる。 According to invention of Claim 4, it selects with respect to the 1st, 2nd electricity supply leg part, the 3rd, 4th electricity supply leg part, and the 5th, 6th electricity supply leg part. By supplying a heating current, it is possible to generate thermoelectrons that can form focal points of three different dimensions. Therefore, it is possible to realize an X-ray tube that irradiates X-rays with three different focal dimensions while using a single filament.

請求項５に記載の発明によれば、熱伝導が小さくなる放熱領域の作用により、第１の電子放出面に生じた熱エネルギーが第２の電子放出面および第３の電子放出面に逃げ、あるいは、第２の電子放出面および第３の電子放出面に生じた熱エネルギーが第４の電子放出面および第５の電子放出面に逃げる割合を減少させることが可能となる。 According to the fifth aspect of the present invention, the heat energy generated in the first electron emission surface escapes to the second electron emission surface and the third electron emission surface by the action of the heat dissipation region where the heat conduction is reduced. Alternatively, it is possible to reduce the rate at which the thermal energy generated on the second electron emission surface and the third electron emission surface escapes to the fourth electron emission surface and the fifth electron emission surface.

請求項６に記載の発明によれば、焦点形状を変化させることなく、第１の電子放出面に生じた熱エネルギーが第２の電子放出面および第３の電子放出面に逃げ、あるいは、第２の電子放出面に生じた熱エネルギーが第４の電子放出面および第５の電子放出面に逃げる割合を減少させることが可能となる。 According to the sixth aspect of the present invention, the thermal energy generated on the first electron emission surface escapes to the second electron emission surface and the third electron emission surface without changing the focal shape, or the first It is possible to reduce the rate at which the thermal energy generated on the second electron emission surface escapes to the fourth electron emission surface and the fifth electron emission surface.

請求項７に記載の発明によれば、加熱電流供給部により第１、第２の通電用脚部と第３、第４の通電用脚部とに対して選択的に加熱電流を供給することで、異なる寸法の焦点を形成できる熱電子を発生することが可能となる。このため、単一のフィラメントを使用しながら異なる焦点寸法でＸ線を照射するＸ線管を実現することが可能となる。 According to the seventh aspect of the present invention, the heating current supply unit selectively supplies the heating current to the first and second energization legs and the third and fourth energization legs. Thus, it is possible to generate thermoelectrons that can form focal points of different dimensions. Therefore, it is possible to realize an X-ray tube that irradiates X-rays with different focal dimensions while using a single filament.

請求項８記載の発明によれば、陰極および陽極を内部に収容する外囲器を備え、陽極が外囲器と一体となって回転する外囲器回転型のＸ線管において、陽極および外囲器の回転中心に第１、第２、第３の電子放出面を備えたフィラメントを配置することにより、加熱電流供給部により第１、第２の通電用脚部と第３、第４の通電用脚部とに対して選択的に加熱電流を供給することで、異なる寸法の焦点を形成できる熱電子を発生することが可能となる。このため、外囲器回転型のＸ線管において、単一のフィラメントを使用しながら異なる焦点寸法でＸ線を照射するＸ線管を実現することが可能となる。 According to the eighth aspect of the present invention, in the envelope rotation type X-ray tube comprising the envelope that accommodates the cathode and the anode therein, and the anode rotates integrally with the envelope, the anode and the outer By disposing the filaments having the first, second, and third electron emission surfaces at the rotation center of the envelope, the heating current supply unit causes the first and second current-carrying legs and the third and fourth By selectively supplying a heating current to the current-carrying legs, it is possible to generate thermoelectrons that can form focal points of different dimensions. For this reason, in the envelope rotation type X-ray tube, it is possible to realize an X-ray tube that emits X-rays with different focal dimensions while using a single filament.

この発明に係るＸ線管１の概要図である。1 is a schematic view of an X-ray tube 1 according to the present invention. この発明の第１実施形態に係る平板フィラメント１３ａを加熱電流供給部１００とともに示す説明図である。It is explanatory drawing which shows the flat filament 13a which concerns on 1st Embodiment of this invention with the heating current supply part 100. FIG. この発明の第２実施形態に係る平板フィラメント１３ｂを加熱電流供給部１００とともに示す説明図である。It is explanatory drawing which shows the flat filament 13b which concerns on 2nd Embodiment of this invention with the heating current supply part 100. FIG. この発明の第３実施形態に係る平板フィラメント１３ｃを加熱電流供給部１００とともに示す説明図である。It is explanatory drawing which shows the flat filament 13c which concerns on 3rd Embodiment of this invention with the heating current supply part 100. FIG. 従来の平板フィラメント７１の概要図である。It is a schematic diagram of the conventional flat filament 71. 従来の平板フィラメント７５の概要図である。It is a schematic diagram of the conventional flat filament 75. FIG.

図１は、この発明に係るＸ線管１の概要図である。 FIG. 1 is a schematic view of an X-ray tube 1 according to the present invention.

このＸ線管１は外囲器回転型のものであり、その内部が真空排気された外囲器１１を備える。この外囲器１１内には、高温に加熱され熱電子を放出するこの発明に係る平板フィラメント１３と、この平板フィラメント１３を溝の中に取り付けた集束電極１４とから構成され、電子ビームＡを発生させる陰極１５が配設されている。また、この陰極１５と対向する外囲器１１の端面には、陰極１５から発生した電子ビームＡが衝突することによりＸ線Ｂを発生させる陽極２１が配設されている。陰極１５および陽極２１には、図示を省略したスリップリング機構により、陰極側回転軸１６および陽極側回転軸１８を介して高電圧が印加される。なお、陰極側回転軸１６および陽極側回転軸１８は、各々、軸受１７、１９により軸支されている。そして、外囲器１１は、図示しないモータの駆動により、陰極１５および陽極２１とともに、陰極側回転軸１６および陽極側回転軸１８を中心に回転する。 The X-ray tube 1 is of an envelope rotating type and includes an envelope 11 whose inside is evacuated. The envelope 11 is composed of a flat filament 13 according to the present invention that is heated to a high temperature and emits thermoelectrons, and a focusing electrode 14 in which the flat filament 13 is mounted in a groove. A cathode 15 to be generated is disposed. An anode 21 that generates X-rays B when an electron beam A generated from the cathode 15 collides is disposed on the end face of the envelope 11 that faces the cathode 15. A high voltage is applied to the cathode 15 and the anode 21 via the cathode side rotating shaft 16 and the anode side rotating shaft 18 by a slip ring mechanism (not shown). The cathode side rotating shaft 16 and the anode side rotating shaft 18 are supported by bearings 17 and 19, respectively. The envelope 11 rotates around the cathode side rotating shaft 16 and the anode side rotating shaft 18 together with the cathode 15 and the anode 21 by driving a motor (not shown).

加熱された平板フィラメント１３において発生した熱電子は集束電極１４により集束され、陰極１５より電子ビームＡが発生する。この電子ビームＡは、高電圧が作る電界の作用により陽極２１に向けて加速される。そして、この電子ビームＡは、外囲器１１の外周部に設けられた偏向コイル１２の作用により偏向され、陽極２１のターゲットディスク傾斜部２２に対して焦点Ｆにおいて衝突し、Ｘ線Ｂを発生させる。このＸ線Ｂは、外囲器１１に形成された放射口２３から外部に放射される。電子ビームＡが陽極２１に衝突する焦点Ｆの位置は、偏向コイル１２に印加する電流を制御することにより変更することができる。 The thermoelectrons generated in the heated flat filament 13 are focused by the focusing electrode 14 and an electron beam A is generated from the cathode 15. The electron beam A is accelerated toward the anode 21 by the action of an electric field generated by a high voltage. The electron beam A is deflected by the action of the deflection coil 12 provided on the outer periphery of the envelope 11 and collides with the target disk inclined portion 22 of the anode 21 at the focal point F to generate X-rays B. Let This X-ray B is radiated to the outside from a radiation port 23 formed in the envelope 11. The position of the focal point F where the electron beam A collides with the anode 21 can be changed by controlling the current applied to the deflection coil 12.

図２は、この発明の第１実施形態に係る平板フィラメント１３ａを加熱電流供給部１００とともに示す説明図である。 FIG. 2 is an explanatory view showing the flat filament 13a according to the first embodiment of the present invention together with the heating current supply unit 100. As shown in FIG.

この平板フィラメント１３ａは、第１の電子放出面３１と、この第１の電子放出面３１における第１の端部側（図２における右側）に接続された第１の通電用脚部４１と、第１の電子放出面３１における第１の端部とは逆側（図２における左側）の第２の端部側に接続された第２の通電用脚部４２と、第１の電子放出面３１の側方（図２における上側）に配設され、第１の電子放出面３１と第１の端部側で接続された第２の電子放出面３２と、この第２の電子放出面３２に対し、第２の端部側に接続された第３の通電用脚部４３と、第１の電子放出面３１における第２の電子放出面３２とは逆側の側方（図２における下側）に配設され、第１の電子放出面３１と第２の端部側で接続された第３の電子放出面３３と、この第３の電子放出面３３に対し、第１の端部側に接続された第４の通電用脚部４４とを備える。この平板フィラメント１３ａにおいては、第１、第２、第３、第４の通電用脚部４１、４２、４３、４４は、図２に示す破線部において直角に曲げられた状態で集束電極１４に取り付けられる。 The flat filament 13a includes a first electron emission surface 31 and a first current-carrying leg 41 connected to the first end side (right side in FIG. 2) of the first electron emission surface 31; A second energization leg portion 42 connected to a second end side opposite to the first end portion of the first electron emission surface 31 (left side in FIG. 2), and the first electron emission surface A second electron emission surface 32 disposed on the side of 31 (upper side in FIG. 2) and connected to the first electron emission surface 31 on the first end side, and the second electron emission surface 32 On the other hand, the third energization leg 43 connected to the second end side and the side opposite to the second electron emission surface 32 of the first electron emission surface 31 (the lower side in FIG. 2). And a third electron emission surface 33 connected to the first electron emission surface 31 on the second end side, and the third electron emission surface 33. Against, and a fourth conducting legs 44 which are connected to the first end side. In this flat filament 13a, the first, second, third, and fourth energizing legs 41, 42, 43, 44 are bent to the focusing electrode 14 in a state of being bent at right angles in the broken line portion shown in FIG. It is attached.

第２の電子放出面３２における第１の電子放出面３１との接続部付近には、孔部３６が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。また、同様に、第３の電子放出面３３における第１の電子放出面３１との接続部付近には、孔部３７が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。 In the vicinity of the connection portion between the second electron emission surface 32 and the first electron emission surface 31, a hole 36 is formed to form a heat dissipation region that reduces heat conduction. Similarly, a hole 37 is formed near the connection portion of the third electron emission surface 33 with the first electron emission surface 31, thereby forming a heat dissipation region that reduces heat conduction. .

また、第１の通電用脚部４１、第２の通電用脚部４２、第３の通電用脚部４３および第４の通電用脚部４４は、各々、加熱電流供給部１００と接続されている。加熱電流供給部１００は、Ｘ線管１を制御する制御部からの信号を受け、第１、第２の通電用脚部４１、４２と、第３、第４の通電用脚部４３、４４とに対して選択的に加熱電流を供給する構成を有する。 The first energizing leg 41, the second energizing leg 42, the third energizing leg 43, and the fourth energizing leg 44 are each connected to the heating current supply unit 100. Yes. The heating current supply unit 100 receives a signal from the control unit that controls the X-ray tube 1, and receives the first and second energization legs 41 and 42 and the third and fourth energization legs 43 and 44. And a configuration in which a heating current is selectively supplied.

以上のような構成を有する平板フィラメント１３ａにおいては、第１の通電用脚部４１と第２の通電用脚部４２とに加熱用電流を供給した場合には、第１の電子放出面３１が加熱され、この第１の電子放出面３１から熱電子が放出される。一方、第３の通電用脚部４３と第４の通電用脚部４４とに加熱用電流を供給した場合には、第１の電子放出面３１、第２の電子放出面３２および第３の電子放出面３３の全体が加熱され、この第１、第２、第３の電子放出面３１、３２、３３から熱電子が放出される。 In the flat filament 13a having the above-described configuration, when a heating current is supplied to the first energizing leg 41 and the second energizing leg 42, the first electron emission surface 31 is When heated, thermoelectrons are emitted from the first electron emission surface 31. On the other hand, when a heating current is supplied to the third energization leg 43 and the fourth energization leg 44, the first electron emission surface 31, the second electron emission surface 32, and the third The entire electron emission surface 33 is heated, and thermoelectrons are emitted from the first, second and third electron emission surfaces 31, 32 and 33.

このため、加熱電流供給部１００により第１、第２の通電用脚部４１、４２と、第３、第４の通電用脚部４３、４４とに対して選択的に加熱電流を供給することにより、異なる寸法の焦点を形成できる熱電子を発生することが可能となる。従って、陽極２１および外囲器１１の回転中心に配置された単一の平板フィラメント１３ａを使用しながら、異なる焦点寸法でＸ線を照射するＸ線管１を実現することが可能となる。 For this reason, the heating current supply unit 100 selectively supplies the heating current to the first and second energizing legs 41 and 42 and the third and fourth energizing legs 43 and 44. Thus, it is possible to generate thermoelectrons that can form focal points of different dimensions. Therefore, it is possible to realize the X-ray tube 1 that irradiates X-rays with different focal dimensions while using the single flat filament 13 a disposed at the rotation center of the anode 21 and the envelope 11.

なお、この平板フィラメント１３ａにおいては、第１の通電用脚部４１と第２の通電用脚部４２とに加熱用電流を供給した場合には、第１の電子放出面３１が加熱されるが、第２の電子放出面３２および第３の電子放出面３３は加熱されない。このため、第１の電子放出面３１に生じた熱エネルギーが第２の電子放出面３２および第３の電子放出面３３に逃げることも考えられる。 In this flat filament 13a, when a heating current is supplied to the first energizing leg 41 and the second energizing leg 42, the first electron emission surface 31 is heated. The second electron emission surface 32 and the third electron emission surface 33 are not heated. For this reason, it is conceivable that the heat energy generated on the first electron emission surface 31 escapes to the second electron emission surface 32 and the third electron emission surface 33.

しかしながら、第２の電子放出面３２における第１の電子放出面３１との接続部付近には、孔部３６が形成されることにより、熱伝導が小さくなる放熱領域が形成されており、また、第３の電子放出面３３における第１の電子放出面３１との接続部付近には、孔部３７が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。このため、熱が逃げる経路となる第２、第３の電子放出面３２、３３における熱の通路の断面積を減少させることにより、第１の電子放出面３１に生じた熱エネルギーが第２の電子放出面３２および第３の電子放出面３３に逃げる割合を減少させることが可能となる。 However, in the vicinity of the connection portion of the second electron emission surface 32 with the first electron emission surface 31, a heat radiating region in which heat conduction is reduced is formed by forming the hole portion 36, and In the vicinity of the connection portion of the third electron emission surface 33 with the first electron emission surface 31, a hole 37 is formed to form a heat dissipation region that reduces heat conduction. For this reason, the heat energy generated in the first electron emission surface 31 is reduced by reducing the cross-sectional area of the heat passages in the second and third electron emission surfaces 32 and 33 that are paths through which heat escapes. It is possible to reduce the rate of escape to the electron emission surface 32 and the third electron emission surface 33.

これらの孔部３６、３７の大きさや第２、第３の電子放出面３２、３３の幅や第１の通電用脚部４１と第２の通電用脚部４２の幅を、第１の電子放出面３１と第２の電子放出面３２および第３の電子放出面３３との熱勾配等を考慮して調整することで、平板フィラメント１３ａに生ずる温度分布を制御することが可能となる。 The sizes of the holes 36 and 37, the widths of the second and third electron emission surfaces 32 and 33, and the widths of the first energization leg 41 and the second energization leg 42 are set as the first electron. The temperature distribution generated in the flat filament 13a can be controlled by adjusting in consideration of the thermal gradient of the emission surface 31, the second electron emission surface 32, and the third electron emission surface 33.

なお、上述した実施形態においては、第２、第３の電子放出面３２、３３に孔部３６、３７を穿設することにより、熱伝導が小さくなる放熱領域を形成している。しかしながら、これらの孔部３６、３７に換えて、第２、第３の電子放出面３２、３３に対してその幅が小さくなるようにその両側から凹部を形成することにより、熱伝導が小さくなる領域を形成してもよい。但し、この場合には、第２、第３の電子放出面３２、３３の外形形状が変化することから、焦点形状が変化する可能性がある。 In the above-described embodiment, the holes 36 and 37 are formed in the second and third electron emission surfaces 32 and 33, thereby forming a heat radiation region in which heat conduction is reduced. However, instead of these holes 36 and 37, the second and third electron emission surfaces 32 and 33 are formed with recesses from both sides so that the width thereof is reduced, thereby reducing the heat conduction. A region may be formed. However, in this case, since the outer shapes of the second and third electron emission surfaces 32 and 33 change, the focus shape may change.

次に、この発明に係る平板フィラメントの他の実施形態について説明する。図３は、この発明の第２実施形態に係る平板フィラメント１３ｂを加熱電流供給部１００とともに示す説明図である。 Next, another embodiment of the flat filament according to the present invention will be described. FIG. 3 is an explanatory view showing the flat filament 13b according to the second embodiment of the present invention together with the heating current supply unit 100. As shown in FIG.

この平板フィラメント１３ｂは、同心円状の形状を有する複数の領域からなる第１の電子放出面５１と、この第１の電子放出面５１における第１の端部側（図３における右側）に接続された第１の通電用脚部６１と、第１の電子放出面５１における第１の端部とは逆側（図３における左側）の第２の端部側に接続された第２の通電用脚部６２と、第１の電子放出面５１の側方（図３における下側）に配設され、第１の電子放出面５１と第１の端部側で接続された第２の電子放出面５２と、この第２の電子放出面５２に対し、第２の端部側に接続された第３の通電用脚部６３と、第１の電子放出面５１における第２の電子放出面５２とは逆側の側方（図３における上側）に配設され、第１の電子放出面５１と第２の端部側で接続された第３の電子放出面５３と、この第３の電子放出面５３に対し、第１の端部側に接続された第４の通電用脚部６４とを備える。この平板フィラメント１３ｂにおいては、第１、第２、第３、第４の通電用脚部６１、６２、６３、６４は、図３に示す破線部において直角に曲げられた状態で集束電極１４に取り付けられる。 The flat filament 13b is connected to a first electron emission surface 51 composed of a plurality of regions having a concentric shape, and a first end side (right side in FIG. 3) of the first electron emission surface 51. The first energization leg 61 and the second energization connected to the second end side opposite to the first end of the first electron emission surface 51 (left side in FIG. 3). The second electron emission disposed on the side of the leg 62 and the first electron emission surface 51 (the lower side in FIG. 3) and connected to the first electron emission surface 51 on the first end side. The second electron emission surface 52 of the first electron emission surface 51, and the third electron conduction surface 63 connected to the second end side with respect to the second electron emission surface 52. 3 is disposed on the opposite side (upper side in FIG. 3) and is connected to the first electron emission surface 51 on the second end side. A release surface 53, with respect to the third electron emitting surface 53, and a fourth conducting legs 64 which are connected to the first end side. In this flat filament 13b, the first, second, third, and fourth energization legs 61, 62, 63, 64 are bent to the focusing electrode 14 in a state of being bent at a right angle in the broken line portion shown in FIG. It is attached.

第２の電子放出面５２における第１の電子放出面５１との接続部付近には、孔部５６が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。また、同様に、第３の電子放出面５３における第１の電子放出面５１との接続部付近には、孔部５７が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。また、第１の通電用脚部６１には、孔部５８が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。さらに、第２の通電用脚部６２には、孔部５９が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。 In the vicinity of the connection portion of the second electron emission surface 52 with the first electron emission surface 51, a heat dissipation region is formed in which heat conduction is reduced by forming a hole portion 56. Similarly, a hole 57 is formed in the vicinity of the connection portion of the third electron emission surface 53 with the first electron emission surface 51, thereby forming a heat dissipation region that reduces heat conduction. . Further, the first energization leg 61 is provided with a heat dissipation region in which heat conduction is reduced by forming the hole 58. Further, the second energization leg 62 is provided with a heat dissipation region in which the heat conduction is reduced by forming the hole 59.

また、第１の通電用脚部６１、第２の通電用脚部６２、第３の通電用脚部６３および第４の通電用脚部６４は、各々、加熱電流供給部１００と接続されている。加熱電流供給部１００は、Ｘ線管１を制御する制御部からの信号を受け、第１、第２の通電用脚部６１、６２と、第３、第４の通電用脚部６３、６４とに対して選択的に加熱電流を供給する構成を有する。 The first energization leg 61, the second energization leg 62, the third energization leg 63, and the fourth energization leg 64 are each connected to the heating current supply unit 100. Yes. The heating current supply unit 100 receives a signal from the control unit that controls the X-ray tube 1 and receives the first and second energization legs 61 and 62 and the third and fourth energization legs 63 and 64. And a configuration in which a heating current is selectively supplied.

以上のような構成を有する平板フィラメント１３ｂにおいても、第１実施形態に係る平板フィラメント１３ａと同様、第１の通電用脚部６１と第２の通電用脚部６２とに加熱用電流を供給した場合には、第１の電子放出面５１が加熱され、この第１の電子放出面５１から熱電子が放出される。一方、第３の通電用脚部６３と第４の通電用脚部６４とに加熱用電流を供給した場合には、第１の電子放出面５１、第２の電子放出面５２および第３の電子放出面５３の全体が加熱され、この第１、第２、第３の電子放出面５１、５２、５３から熱電子が放出される。 Also in the flat filament 13b having the above-described configuration, the heating current is supplied to the first energizing leg 61 and the second energizing leg 62, as in the flat filament 13a according to the first embodiment. In this case, the first electron emission surface 51 is heated, and thermoelectrons are emitted from the first electron emission surface 51. On the other hand, when a heating current is supplied to the third energization leg 63 and the fourth energization leg 64, the first electron emission surface 51, the second electron emission surface 52, and the third The entire electron emission surface 53 is heated, and thermoelectrons are emitted from the first, second, and third electron emission surfaces 51, 52, and 53.

このため、加熱電流供給部１００により第１、第２の通電用脚部６１、６２と、第３、第４の通電用脚部６３、６４とに対して選択的に加熱電流を供給することにより、異なる寸法の焦点を形成できる熱電子を発生することが可能となる。従って、陽極２１および外囲器１１の回転中心に配置された単一の平板フィラメント１３ｂを使用しながら、異なる焦点寸法でＸ線を照射するＸ線管１を実現することが可能となる。 For this reason, the heating current supply unit 100 selectively supplies the heating current to the first and second energization legs 61 and 62 and the third and fourth energization legs 63 and 64. Thus, it is possible to generate thermoelectrons that can form focal points of different dimensions. Accordingly, it is possible to realize the X-ray tube 1 that irradiates X-rays with different focal dimensions while using the single flat filament 13b disposed at the rotation center of the anode 21 and the envelope 11.

また、この第２実施形態に係る平板フィラメント１３ｂにおいても、第２の電子放出面５２における第１の電子放出面５１との接続部付近には、孔部５６が形成されることにより、熱伝導が小さくなる放熱領域が形成されており、また、第３の電子放出面５３における第１の電子放出面５１との接続部付近には、孔部５７が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。このため、熱が逃げる経路となる第２、第３の電子放出面５２、５３における熱の通路の断面積を減少させることにより、第１の電子放出面５１に生じた熱エネルギーが第２の電子放出面５２および第３の電子放出面５３に逃げる割合を減少させることが可能となる。 Also in the flat filament 13b according to the second embodiment, the hole 56 is formed in the vicinity of the connection portion of the second electron emission surface 52 with the first electron emission surface 51, thereby conducting heat conduction. Is formed in the vicinity of the connection portion of the third electron emission surface 53 with the first electron emission surface 51, thereby reducing heat conduction. A heat dissipation region is formed. For this reason, the heat energy generated in the first electron emission surface 51 is reduced by reducing the cross-sectional area of the heat passages in the second and third electron emission surfaces 52 and 53 that are paths through which heat escapes. It is possible to reduce the rate of escape to the electron emission surface 52 and the third electron emission surface 53.

次に、この発明に係る平板フィラメントのさらに他の実施形態について説明する。図４は、この発明の第３実施形態に係る平板フィラメント１３ｃを加熱電流供給部１００とともに示す説明図である。 Next, still another embodiment of the flat filament according to the present invention will be described. FIG. 4 is an explanatory view showing the flat filament 13c according to the third embodiment of the present invention together with the heating current supply unit 100. As shown in FIG.

この第３実施形態に係る平板フィラメント１３ｃは、図２に示す平板フィラメント１３ａに対して、第２の電子放出面３２における第１の電子放出面３１とは逆側の側方（図４における上側）に配設され、第２の電子放出面３２と第２の端部側（図４における左側）で接続された第４の電子放出面３４と、この第４の電子放出面３４に対し、第１の端部側（図４における右側）に接続された第５の通電用脚部４５と、第３の電子放出面３３における第１の電子放出面３１とは逆側の側方（図４における下側）に配設され、第３の電子放出面３３と第１の端部側で接続された第５の電子放出面３５と、この第５の電子放出面３５に対し、第２の端部側に接続された第６の通電用脚部４６とをさらに備えた構成を有する。この平板フィラメント１３ｃにおいては、第１、第２、第３、第４、第５、第６の通電用脚部４１、４２、４３、４４、４５、４６は、図４に示す破線部において直角に曲げられた状態で集束電極１４に取り付けられる。 The flat filament 13c according to the third embodiment is the side opposite to the first electron emission surface 31 in the second electron emission surface 32 (the upper side in FIG. 4) with respect to the flat filament 13a shown in FIG. And a fourth electron emission surface 34 connected to the second electron emission surface 32 on the second end side (left side in FIG. 4), and the fourth electron emission surface 34. The fifth current-carrying leg 45 connected to the first end side (the right side in FIG. 4) and the side opposite to the first electron-emitting surface 31 in the third electron-emitting surface 33 (see FIG. 4), the fifth electron emission surface 35 connected to the third electron emission surface 33 on the first end side, and the second electron emission surface 35 with respect to the second electron emission surface 35. And a sixth energization leg portion 46 connected to the end portion side. In this flat filament 13c, the first, second, third, fourth, fifth, and sixth energization legs 41, 42, 43, 44, 45, and 46 are perpendicular to each other in the broken line portion shown in FIG. It is attached to the focusing electrode 14 in a bent state.

第４の電子放出面３４における第２の電子放出面３２との接続部付近には、孔部３８が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。また、同様に、第５の電子放出面３５における第３の電子放出面３３との接続部付近には、孔部３９が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。 Near the connecting portion of the fourth electron emission surface 34 with the second electron emission surface 32, a hole 38 is formed to form a heat dissipation region that reduces heat conduction. Similarly, in the vicinity of the connection portion of the fifth electron emission surface 35 with the third electron emission surface 33, a heat dissipation region that reduces heat conduction is formed by forming a hole 39. .

また、第１の通電用脚部４１、第２の通電用脚部４２、第３の通電用脚部４３、第４の通電用脚部４４、第５の通電用脚部４５および第６の通電用脚部４６は、各々、加熱電流供給部１００と接続されている。加熱電流供給部１００は、Ｘ線管１を制御する制御部からの信号を受け、第１、第２の通電用脚部４１、４２と、第３、第４の通電用脚部４３、４４と、第５、第６の通電用脚部４５、４６に対して選択的に加熱電流を供給する構成を有する。 Also, the first energization leg 41, the second energization leg 42, the third energization leg 43, the fourth energization leg 44, the fifth energization leg 45, and the sixth energization leg 45. The energization legs 46 are each connected to the heating current supply unit 100. The heating current supply unit 100 receives a signal from the control unit that controls the X-ray tube 1, and receives the first and second energization legs 41 and 42 and the third and fourth energization legs 43 and 44. And a heating current is selectively supplied to the fifth and sixth energizing legs 45 and 46.

以上のような構成を有する平板フィラメント１３ｃにおいては、第１の通電用脚部４１と第２の通電用脚部４２とに加熱用電流を供給した場合には、第１の電子放出面３１が加熱され、この第１の電子放出面３１から熱電子が放出される。一方、第３の通電用脚部４３と第４の通電用脚部４４とに加熱用電流を供給した場合には、第１の電子放出面３１、第２の電子放出面３２および第３の電子放出面３３が加熱され、この第１、第２、第３の電子放出面３１、３２、３３から熱電子が放出される。さらに、第５の通電用脚部４５と第６の通電用脚部４６とに加熱用電流を供給した場合には、第１の電子放出面３１、第２の電子放出面３２、第３の電子放出面３３、第４の電子放出面３４および第５の電子放出面３５の全体が加熱され、この第１、第２、第３、第４、第５の電子放出面３１、３２、３３、３４、３５から熱電子が放出される。 In the flat filament 13c having the above-described configuration, when a heating current is supplied to the first energization leg 41 and the second energization leg 42, the first electron emission surface 31 is When heated, thermoelectrons are emitted from the first electron emission surface 31. On the other hand, when a heating current is supplied to the third energization leg 43 and the fourth energization leg 44, the first electron emission surface 31, the second electron emission surface 32, and the third The electron emission surface 33 is heated, and thermoelectrons are emitted from the first, second and third electron emission surfaces 31, 32 and 33. Further, when a heating current is supplied to the fifth energization leg 45 and the sixth energization leg 46, the first electron emission surface 31, the second electron emission surface 32, and the third The whole of the electron emission surface 33, the fourth electron emission surface 34, and the fifth electron emission surface 35 is heated, and the first, second, third, fourth, and fifth electron emission surfaces 31, 32, and 33 are heated. , 34 and 35 emit thermal electrons.

このため、加熱電流供給部１００により第１、第２の通電用脚部３１、３２と、第３、第４の通電用脚部４３、４４と、第５、第６の通電用脚部４５、４６とに対して選択的に加熱電流を供給することにより、異なる三種類の寸法の焦点を形成できる熱電子を発生することが可能となる。従って、陽極２１および外囲器１１の回転中心に配置された単一の平板フィラメント１３ｃを使用しながら、異なる三種類の焦点寸法でＸ線を照射するＸ線管１を実現することが可能となる。 Therefore, the heating current supply unit 100 causes the first and second energization legs 31 and 32, the third and fourth energization legs 43 and 44, and the fifth and sixth energization legs 45. , 46 by selectively supplying a heating current, it is possible to generate thermoelectrons capable of forming focal points of three different dimensions. Accordingly, it is possible to realize the X-ray tube 1 that irradiates X-rays with three different focal dimensions while using the single flat filament 13c arranged at the rotation center of the anode 21 and the envelope 11. Become.

また、この実施形態に係る平板フィラメント１３ｃにおいては、第４の電子放出面３４における第２の電子放出面３２との接続部付近には、孔部３８が形成されることにより、熱伝導が小さくなる放熱領域が形成されており、また、第５の電子放出面３５における第３の電子放出面３３との接続部付近には、孔部３９が形成されることにより、熱伝導が小さくなる放熱領域が形成されている。このため、熱が逃げる経路となる第４、第５の電子放出面３４、３５における熱の通路の断面積を減少させることにより、第２の電子放出面３２に生じた熱エネルギーが第４の電子放出面３４に、また、第３の電子放出面３３に生じた熱エネルギーが第５の電子放出面３５に逃げる割合を減少させることが可能となる。 Further, in the flat filament 13c according to this embodiment, the hole 38 is formed in the vicinity of the connection portion of the fourth electron emission surface 34 with the second electron emission surface 32, so that the heat conduction is small. The heat dissipation region is formed, and the hole 39 is formed in the vicinity of the connection portion of the fifth electron emission surface 35 with the third electron emission surface 33, so that the heat conduction is reduced. A region is formed. For this reason, the thermal energy generated in the second electron emission surface 32 is reduced by reducing the cross-sectional area of the heat passages in the fourth and fifth electron emission surfaces 34 and 35 serving as paths through which heat escapes. It is possible to reduce the rate at which the thermal energy generated on the electron emission surface 34 and on the third electron emission surface 33 escapes to the fifth electron emission surface 35.

１Ｘ線管
１１外囲器
１２偏向コイル
１３平板フィラメント
１４集束電極
１５陰極
１６陰極側回転軸
１８陽極側回転軸
２１陽極
２２ターゲットディスク傾斜部
３１第１の電子放出面
３２第２の電子放出面
３３第３の電子放出面
３４第４の電子放出面
３５第５の電子放出面
３６孔部
３７孔部
３８孔部
３９孔部
４１第１の通電用脚部
４２第２の通電用脚部
４３第３の通電用脚部
４４第４の通電用脚部
４５第５の通電用脚部
４６第６の通電用脚部
５１第１の電子放出面
５２第２の電子放出面
５３第３の電子放出面
５６孔部
５７孔部
６１第１の通電用脚部
６２第２の通電用脚部
６３第３の通電用脚部
６４第４の通電用脚部
１００加熱電流供給部
Ａ電子ビーム
ＢＸ線
DESCRIPTION OF SYMBOLS 1 X-ray tube 11 Envelope 12 Deflection coil 13 Flat filament 14 Focusing electrode 15 Cathode 16 Cathode side rotating shaft 18 Anode side rotating shaft 21 Anode 22 Target disk inclination part 31 1st electron emission surface 32 2nd electron emission surface 33 3rd electron emission surface 34 4th electron emission surface 35 5th electron emission surface 36 hole part 37 hole part 38 hole part 39 hole part 41 1st electricity supply leg part 42 2nd electricity supply leg part 43 Third energization leg 44 Fourth energization leg 45 Fifth energization leg 46 Sixth energization leg 51 First electron emission surface 52 Second electron emission surface 53 Third electron Emission surface 56 Hole portion 57 Hole portion 61 First energization leg portion 62 Second energization leg portion 63 Third energization leg portion 64 Fourth energization leg portion 100 Heating current supply portion A Electron beam B X line

Claims

A first electron emission surface;
A first energization leg connected to the first end of the first electron emission surface;
A second leg portion for energization connected to a second end portion side opposite to the first end portion in the first electron emission surface;
A second electron emission surface disposed on a side of the first electron emission surface and connected to the first electron emission surface on the first end side;
A third current-carrying leg connected to the second end side with respect to the second electron emission surface;
Third electrons arranged on the side opposite to the second electron emission surface of the first electron emission surface and connected to the first electron emission surface and the second end side. A discharge surface;
A fourth energization leg connected to the first end side with respect to the third electron emission surface;
A flat filament for an X-ray tube.

In the flat filament for X-ray tubes according to claim 1,
Thermal conductivity is small in the vicinity of the connection portion of the second electron emission surface with the first electron emission surface and in the vicinity of the connection portion of the third electron emission surface with the first electron emission surface. A flat filament for an X-ray tube in which a heat dissipation region is formed.

In the flat filament for X-ray tubes according to claim 2,
The heat radiation area is a flat filament for an X-ray tube, which is an area having holes formed in the second electron emission surface and the third electron emission surface.

In the flat filament for X-ray tubes in any one of Claims 1 thru | or 3,
Fourth electrons disposed on the side opposite to the first electron emission surface of the second electron emission surface and connected to the second electron emission surface on the second end side. A discharge surface;
A fifth current-carrying leg connected to the first end side with respect to the fourth electron emission surface;
A fifth electron disposed on the side opposite to the first electron emission surface of the third electron emission surface and connected to the third electron emission surface on the first end side. A discharge surface;
A sixth energization leg connected to the second end side with respect to the fifth electron emission surface;
A flat filament for an X-ray tube.

In the flat filament for X-ray tubes according to claim 4,
Thermal conductivity is small in the vicinity of the connection portion of the fourth electron emission surface with the second electron emission surface and in the vicinity of the connection portion of the fifth electron emission surface with the third electron emission surface. A flat filament for an X-ray tube in which a heat dissipation region is formed.

In the flat filament for X-ray tubes according to claim 5,
The heat radiation area is a flat filament for an X-ray tube, which is an area having holes formed in the fourth electron emission surface and the fifth electron emission surface.

In an X-ray tube comprising a cathode having a flat filament and generating an electron beam, and an anode generating X-rays by collision of the electron beam generated from the cathode,
The flat filament is
A first electron emission surface;
A first energization leg connected to the first end of the first electron emission surface;
A second leg portion for energization connected to a second end portion side opposite to the first end portion in the first electron emission surface;
A second electron emission surface disposed on a side of the first electron emission surface and connected to the first electron emission surface on the first end side;
A third current-carrying leg connected to the second end side with respect to the second electron emission surface;
Third electrons arranged on the side opposite to the second electron emission surface of the first electron emission surface and connected to the first electron emission surface and the second end side. A discharge surface;
A fourth energization leg connected to the first end side with respect to the third electron emission surface;
With
An X-ray comprising a heating current supply section that selectively supplies a heating current to the first and second energization legs and the third and fourth energization legs. tube.

A cathode that generates an electron beam, an anode that generates X-rays when the electron beam generated from the cathode collides, and a focal point at which the electron beam collides with the anode by deflecting the electron beam generated from the cathode An envelope rotating type X-ray tube comprising a deflection coil for controlling the position of the envelope and an envelope for accommodating the cathode and the anode therein, wherein the anode rotates integrally with the envelope. ,
The flat filament is
A first electron emission surface;
A first energization leg connected to the first end of the first electron emission surface;
A second leg portion for energization connected to a second end portion side opposite to the first end portion in the first electron emission surface;
A second electron emission surface disposed on a side of the first electron emission surface and connected to the first electron emission surface on the first end side;
A third current-carrying leg connected to the second end side with respect to the second electron emission surface;
Third electrons arranged on the side opposite to the second electron emission surface of the first electron emission surface and connected to the first electron emission surface and the second end side. A discharge surface;
A fourth energization leg connected to the first end side with respect to the third electron emission surface;
With
An X-ray comprising a heating current supply section that selectively supplies a heating current to the first and second energization legs and the third and fourth energization legs. tube.