JP6888524B2

JP6888524B2 - coaxial cable

Info

Publication number: JP6888524B2
Application number: JP2017213408A
Authority: JP
Inventors: 長田　俊宏; 俊宏長田; 征男東
Original assignee: Meidensha Corp
Current assignee: Meidensha Corp
Priority date: 2017-11-06
Filing date: 2017-11-06
Publication date: 2021-06-16
Anticipated expiration: 2037-11-06
Also published as: JP2019087352A

Description

本発明は、同軸ケーブルの構造に関する。特に、パルス電源装置の出力部に備えられる同軸ケーブルの構造に関する。 The present invention relates to the structure of a coaxial cable. In particular, the present invention relates to the structure of a coaxial cable provided in the output unit of a pulse power supply device.

パルス幅可変式パルス電源としては、パルス形成線路（Pulse Forming Line :ＰＦＬ）やパルス形成回路（Pulse Forming Network :ＰＦＮ）、ブルームライン線路を使った方式が考えられる。また、パルス幅可変式パルス電源として、図９に示す回路構成２５を備え、スイッチＳＷ１、ＳＷ２等でダイレクトに負荷（ｌｏａｄ）に電力を供給する方式がある。この方式は、立ち上がり／立ち下がり時間が数十ｎｓｅｃと短く、数百ｎｓｅｃまでの短パルス幅出力が求められ、かつ容易にパルス幅変調できるものとして有効である。 As the pulse width variable pulse power supply, a method using a pulse forming line (PFL), a pulse forming circuit (Pulse Forming Network: PFN), or a bloom line line can be considered. Further, as the pulse width variable pulse power supply, there is a method in which the circuit configuration 25 shown in FIG. 9 is provided and power is directly supplied to the load by switches SW1, SW2 and the like. This method is effective because the rise / fall time is as short as several tens of nsec, a short pulse width output of up to several hundred nsec is required, and the pulse width can be easily modulated.

回路構成２５において、平滑コンデンサＣは、外部から直流電源等で電力供給し、直流電源の応答性により電圧低下が考えられる場合に挿入される。 In the circuit configuration 25, the smoothing capacitor C is inserted when power is supplied from the outside by a DC power supply or the like and a voltage drop is considered due to the responsiveness of the DC power supply.

また、負荷（ｌｏａｄ）が抵抗負荷の場合、抵抗Ｒ２やスイッチＳＷ２は不要となる。これに対して、負荷（ｌｏａｄ）が、容量性負荷等、負荷（ｌｏａｄ）にエネルギーが残存し、電圧を立ち下げたい場合は、抵抗Ｒ２、スイッチＳＷ２が必要となる。また、回路浮遊分のインダクタンスや負荷が容量性の場合に生じる振動を抑制するため、必要に応じて抵抗Ｒ１、Ｒ２が挿入される。 Further, when the load is a resistance load, the resistance R2 and the switch SW2 are unnecessary. On the other hand, when the load is a capacitive load or the like and energy remains in the load and the voltage is to be lowered, the resistor R2 and the switch SW2 are required. Further, in order to suppress the vibration generated when the inductance of the circuit floating portion and the load are capacitive, resistors R1 and R2 are inserted as necessary.

図１０は、スイッチＳＷ１、ＳＷ２のタイミングチャートである。負荷（ｌｏａｄ）にエネルギーを供給し、負荷（ｌｏａｄ）側の電圧を立ち上げたいときは、スイッチＳＷ１をＯＮ、スイッチＳＷ２をＯＦＦする。その後、負荷（ｌｏａｄ）側の電圧を立ち下げたい場合は、スイッチＳＷ１をＯＦＦ、スイッチＳＷ２をＯＮし、電圧を立ち下げる。 FIG. 10 is a timing chart of switches SW1 and SW2. When it is desired to supply energy to the load and raise the voltage on the load side, the switch SW1 is turned on and the switch SW2 is turned off. After that, when it is desired to lower the voltage on the load side, the switch SW1 is turned off, the switch SW2 is turned on, and the voltage is lowered.

パルス電源を負荷（ｌｏａｄ）に接続する場合、パルス電源と負荷（ｌｏａｄ）の間は、同軸ケーブル等で接続される（例えば、特許文献１、２）。 When the pulse power supply is connected to the load, the pulse power supply and the load are connected by a coaxial cable or the like (for example, Patent Documents 1 and 2).

図１１に示すように、従来技術に係る同軸ケーブル２６は、曲げＲ、外形および可撓性の良さ等を考慮して、内部導体である芯線２７の外周側にシリコン樹脂（シロキサン結合による主骨格を持つ合成高分子化合物）等の絶縁層２８が備えられる。 As shown in FIG. 11, the coaxial cable 26 according to the prior art has a silicon resin (main skeleton due to siloxane bond) on the outer peripheral side of the core wire 27, which is an internal conductor, in consideration of bending R, outer shape, good flexibility, and the like. An insulating layer 28 such as a synthetic polymer compound having the above is provided.

同軸ケーブル２６（特に、高周波高電圧を想定した同軸ケーブル）は、芯線２７と絶縁層２８の間に半導体層２９を備える。この半導体層２９により、コロナ放電が緩和される。また、絶縁層２８の外周には、アース線であるシールド材３０が備えられる。さらに、シールド材３０の外周には、シールド材３０を保護する絶縁層３１が備えられる。 The coaxial cable 26 (particularly, a coaxial cable assuming high frequency and high voltage) includes a semiconductor layer 29 between the core wire 27 and the insulating layer 28. The semiconductor layer 29 alleviates the corona discharge. Further, a shield material 30 which is a ground wire is provided on the outer periphery of the insulating layer 28. Further, an insulating layer 31 that protects the shield material 30 is provided on the outer periphery of the shield material 30.

芯線２７を高電圧側に接続し、シールド材３０をアース線に接続した場合、絶縁層２８は、芯線２７（高電圧側）とシールド材３０（アース線）の間の絶縁の役割を果たす。 When the core wire 27 is connected to the high voltage side and the shield material 30 is connected to the ground wire, the insulating layer 28 plays a role of insulating between the core wire 27 (high voltage side) and the shield material 30 (earth wire).

同軸ケーブルの単位長さあたりの浮遊容量（Ｃ_stray）は、式（１）によって算出される。例えば、同軸ケーブル２６の場合、内部導体は、芯線２７であり、外部導体は、シールド材３０である。また、εは、芯線２７とシールド材３０の間の誘電率である。
Ｃ_stray（Ｆ／ｍ）＝２πε／ｌｎ（外部導体の半径（ｍ）／内部導体の半径（ｍ）） …（１）
式（１）に示すように、同軸ケーブルの単位長さあたりの浮遊容量は、内部導体と外部導体の間に設けられる材料によって規定される誘電率の影響が大きい。特に、シリコン樹脂等は誘電率が高いため、浮遊容量は大きくなる。また、各層間に存在する微小な空気層がコロナ放電を引き起こし、長時間使用し続けると、絶縁破壊を引き起こすきっかけとなるため、コロナ放電対策としては、十分な空気層の確保が必要である。 The stray capacitance per unit length of the coaxial cable (C _stray ) is calculated by the equation (1). For example, in the case of the coaxial cable 26, the inner conductor is the core wire 27, and the outer conductor is the shield material 30. Further, ε is the dielectric constant between the core wire 27 and the shield material 30.
C _stray (F / m) = 2πε / ln (radius of outer conductor (m) / radius of inner conductor (m)) ... (1)
As shown in the formula (1), the stray capacitance per unit length of the coaxial cable is greatly affected by the dielectric constant defined by the material provided between the inner conductor and the outer conductor. In particular, since silicon resin and the like have a high dielectric constant, the stray capacitance becomes large. In addition, a minute air layer existing between each layer causes corona discharge, and if it is used for a long time, it may cause dielectric breakdown. Therefore, it is necessary to secure a sufficient air layer as a countermeasure against corona discharge.

また、同軸ケーブルに含まれる浮遊インダクタンスや浮遊容量（Ｌ_stray、Ｃ_stray）の影響により、高速な立ち上がり、立ち下がり時間が得られなくなるおそれがある。よって、浮遊インダクタンスは、数百ｎＨ程度で、浮遊容量は、数十ｐＦ程度と極力小さくしなくてはならない。 _{Further, due to the influence of the stray} inductance and stray capacitance (L _stray , C stray) contained in the coaxial cable, there is a possibility that a high-speed rise / fall time cannot be obtained. Therefore, the stray inductance must be about several hundred nH, and the stray capacitance must be as small as about several tens of pF.

特開２０１５−９５３０２号公報JP-A-2015-95302 実開平４−７４８１２号公報Jikkenhei 4-74812 Gazette

同軸ケーブルに含まれる浮遊容量（Ｃ_stray）により、直流電源の消費電力は、「Ｃ_stray×（出力電圧）²×周波数」の分だけ増大することとなる。 _{Due to the stray} capacitance (C stray) contained in the coaxial cable, the power consumption of the DC power supply is _{increased by "C stray} x (output voltage) ² x frequency".

また、同軸ケーブルは、パルス電源と負荷（ｌｏａｄ）の間を接続するため、耐電圧が高いだけでなく、高周波な電圧が印加されるため耐コロナ性が求められる。 Further, since the coaxial cable connects between the pulse power supply and the load, not only the withstand voltage is high, but also the high frequency voltage is applied, so that the coaxial cable is required to have corona resistance.

本発明は、上記事情に鑑みて成されたものであり、同軸ケーブルの浮遊容量を低減し、同軸ケーブルの耐コロナ性を向上させる技術を提供することを目的としている。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique for reducing stray capacitance of a coaxial cable and improving corona resistance of the coaxial cable.

上記目的を達成する本発明の同軸ケーブルの一態様は、
絶縁筒と、
前記絶縁筒の内部に挿入して設けられる内部導体と、
前記絶縁筒の端部にそれぞれ設けられ、前記絶縁筒に前記内部導体を絶縁支持する端部絶縁部材と、
前記絶縁筒内に摺動可能に設けられ、前記絶縁筒に前記内部導体を絶縁支持する支持部材と、
前記絶縁筒の外周に設けられる外部導体と、を備え、
前記内部導体は、前記支持部材と前記内部導体が固定された状態で、前記支持部材に設けられ、
前記内部導体は、前記端部絶縁部材と前記内部導体が摺動可能な状態で、前記端部絶縁部材に設けられた、ことを特徴としている。 One aspect of the coaxial cable of the present invention that achieves the above object is
Insulation cylinder and
An internal conductor inserted inside the insulating cylinder and
An end insulating member provided at each end of the insulating cylinder and insulatingly supporting the internal conductor in the insulating cylinder, and an end insulating member.
A support member that is slidably provided in the insulating cylinder and that insulates and supports the internal conductor in the insulating cylinder.
An external conductor provided on the outer circumference of the insulating cylinder is provided.
The inner conductor is provided on the support member in a state where the support member and the inner conductor are fixed.
The inner conductor is characterized in that it is provided on the end insulating member in a state where the end insulating member and the inner conductor are slidable.

また、上記目的を達成する本発明の同軸ケーブルの他の態様は、上記同軸ケーブルにおいて、
前記絶縁筒は、円筒状である、ことを特徴としている。 In addition, another aspect of the coaxial cable of the present invention that achieves the above object is the coaxial cable.
The insulating cylinder is characterized in that it has a cylindrical shape.

また、上記目的を達成する本発明の同軸ケーブルの他の態様は、上記同軸ケーブルにおいて、
前記絶縁筒は、蛇腹状に形成された筒状である、ことを特徴としている。 In addition, another aspect of the coaxial cable of the present invention that achieves the above object is the coaxial cable.
The insulating cylinder is characterized in that it has a bellows-like shape.

また、上記目的を達成する本発明の同軸ケーブルの他の態様は、上記同軸ケーブルにおいて、
前記支持部材は、円柱状である、ことを特徴としている。 In addition, another aspect of the coaxial cable of the present invention that achieves the above object is the coaxial cable.
The support member is characterized in that it has a columnar shape.

また、上記目的を達成する本発明の同軸ケーブルの他の態様は、上記同軸ケーブルにおいて、
前記支持部材は、前記内部導体が挿通される中央部と、前記絶縁筒と摺接する外周部の厚みが厚く形成された円盤状である、ことを特徴としている。 In addition, another aspect of the coaxial cable of the present invention that achieves the above object is the coaxial cable.
The support member is characterized in that it has a disk shape in which a central portion through which the internal conductor is inserted and an outer peripheral portion that is in sliding contact with the insulating cylinder are formed to be thick.

また、上記目的を達成する本発明の同軸ケーブルの他の態様は、上記同軸ケーブルにおいて、
前記支持部材に、ねじ込んで取り付けられる固定ねじを備え、
前記固定ねじの端部が、前記支持部材に支持された前記内部導体を押圧して、前記支持部材に前記内部導体が固定された、ことを特徴としている。 In addition, another aspect of the coaxial cable of the present invention that achieves the above object is the coaxial cable.
The support member is provided with a fixing screw that can be screwed and attached.
The end of the fixing screw presses the inner conductor supported by the support member, so that the inner conductor is fixed to the support member.

以上の発明によれば、同軸ケーブルの浮遊容量を低減し、同軸ケーブルの耐コロナ性を向上させることができる。 According to the above invention, the stray capacitance of the coaxial cable can be reduced and the corona resistance of the coaxial cable can be improved.

本発明の第１実施形態に係る同軸ケーブルの断面図である。It is sectional drawing of the coaxial cable which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る同軸ケーブルの端部拡大断面図である。It is the end part enlarged sectional view of the coaxial cable which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る同軸ケーブルの端部拡大断面図である。It is the end part enlarged sectional view of the coaxial cable which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係る同軸ケーブルの端部拡大断面図である。It is the end part enlarged sectional view of the coaxial cable which concerns on 3rd Embodiment of this invention. 本発明の第４実施形態に係る同軸ケーブルの端部拡大断面図である。It is the end part enlarged sectional view of the coaxial cable which concerns on 4th Embodiment of this invention. （ａ）本発明の第５実施形態に係る同軸ケーブルの断面図、（ｂ）本発明の第５実施形態に係る同軸ケーブルの端部拡大断面図である。(A) is a cross-sectional view of the coaxial cable according to the fifth embodiment of the present invention, and (b) is an enlarged cross-sectional view of the end of the coaxial cable according to the fifth embodiment of the present invention. （ａ）本発明の第６実施形態に係る同軸ケーブルの断面図、（ｂ）本発明の第６実施形態に係る同軸ケーブルの端部拡大断面図である。(A) is a cross-sectional view of the coaxial cable according to the sixth embodiment of the present invention, and (b) is an enlarged cross-sectional view of the end of the coaxial cable according to the sixth embodiment of the present invention. 本発明の第１実施形態に係る同軸ケーブルの他例の端部拡大断面図である。It is the end part enlarged sectional view of another example of the coaxial cable which concerns on 1st Embodiment of this invention. パルス幅可変式パルス電源の回路構成の一例を示す図である。It is a figure which shows an example of the circuit structure of the pulse width variable type pulse power supply. スイッチＳＷ１、ＳＷ２のタイミングチャートである。It is a timing chart of switches SW1 and SW2. 従来技術に係る同軸ケーブルの断面図である。It is sectional drawing of the coaxial cable which concerns on the prior art.

本発明の実施形態に係る同軸ケーブルについて、図面に基づいて詳細に説明する。 The coaxial cable according to the embodiment of the present invention will be described in detail with reference to the drawings.

図１に示すように、本発明の第１実施形態に係る同軸ケーブル１は、内部導体である芯線２と、芯線２が内部に挿通される絶縁筒３と、絶縁筒３の外周に配置されるシールド材４と、絶縁筒３内に芯線２を絶縁支持する支持部材５と、絶縁筒３の端部にそれぞれ設けられる端部絶縁部材６を備える。支持部材５は、同軸ケーブル１の長さに応じて１つ以上備えられる。 As shown in FIG. 1, the coaxial cable 1 according to the first embodiment of the present invention is arranged on the outer periphery of the core wire 2 which is an internal conductor, the insulating cylinder 3 through which the core wire 2 is inserted, and the insulating cylinder 3. The shield material 4 is provided, a support member 5 for insulatingly supporting the core wire 2 in the insulating cylinder 3, and an end insulating member 6 provided at each end of the insulating cylinder 3. One or more support members 5 are provided depending on the length of the coaxial cable 1.

図２に基づいて、第１実施形態に係る同軸ケーブル１について詳細に説明する。図２は、図１に示した同軸ケーブル１の端部（点線で囲んだ部分）の拡大図である。 The coaxial cable 1 according to the first embodiment will be described in detail with reference to FIG. FIG. 2 is an enlarged view of an end portion (a portion surrounded by a dotted line) of the coaxial cable 1 shown in FIG.

芯線２は、高圧側の導体であり、例えば、エナメル線（銅線のまわりにエナメルを塗布したもの）が用いられる。芯線２は、単線や撚線である。芯線２の端部は、絶縁筒３の端部から延在しており、この延在した端部に圧着端子２ａ（負荷またはパルス電源装置に接続される端子）がはんだ付け等で備えられる。 The core wire 2 is a conductor on the high voltage side, and for example, an enamel wire (a copper wire coated with enamel) is used. The core wire 2 is a single wire or a stranded wire. The end of the core wire 2 extends from the end of the insulating cylinder 3, and a crimp terminal 2a (a terminal connected to a load or a pulse power supply device) is provided at the extended end by soldering or the like.

支持部材５は、例えば、ＰＴＦＥ（ポリテトラフルオロエチレン）で形成された円柱状の部材である。支持部材５は、その外周と絶縁筒３の内周が摺動可能な状態で、絶縁筒３内に１つ以上設けられる。支持部材５の中央には、芯線２が挿通される孔が形成される。支持部材５に挿通された芯線２は、接着剤７等で支持部材５に固定される。支持部材５を形成する材料として、ＰＴＦＥの他に、例えば、ＰＦＡ（テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体）、ＦＥＰ（フッ化エチレンプロピレンテトラフルオロエチレン−ヘキサフルオロプロピレン共重合体）等のフッ素系樹脂や、ＰＥ（ポリエチレン）やＰＰ（ポリプロピレン）等のポリオレフィン系樹脂等が使用される。 The support member 5 is, for example, a columnar member made of PTFE (polytetrafluoroethylene). One or more support members 5 are provided in the insulating cylinder 3 in a state where the outer circumference thereof and the inner circumference of the insulating cylinder 3 are slidable. A hole through which the core wire 2 is inserted is formed in the center of the support member 5. The core wire 2 inserted through the support member 5 is fixed to the support member 5 with an adhesive 7 or the like. As a material for forming the support member 5, in addition to PTFE, for example, PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), FEP (fluorinated ethylene propylene tetrafluoroethylene-hexafluoropropylene copolymer), etc. Fluorine-based resins and polyolefin-based resins such as PE (polyethylene) and PP (polypropylene) are used.

絶縁筒３は、例えば、ＰＴＦＥで形成された円筒状のチューブである。絶縁筒３を形成する材料として、ＰＴＦＥの他に、例えば、ＰＦＡやＦＥＰ等のフッ素系樹脂や、ＰＥやＰＰ等のポリオレフィン系樹脂等が使用される。 The insulating cylinder 3 is, for example, a cylindrical tube formed of PTFE. As a material for forming the insulating cylinder 3, for example, a fluorine-based resin such as PFA or FEP, a polyolefin-based resin such as PE or PP, or the like is used in addition to PTFE.

シールド材４は、絶縁筒３の外周に配置される円筒状で網目状の導体（外部導体）である。シールド材４は、アース線に相当する。シールド材４からのアース端子４ａの引き出しは、アース端子４ａが接続された電線４ｂにより行われる。つまり、シールド材４には、電線４ｂの一端がはんだ付け等により接続され、電線４ｂの他端にはアース端子４ａがはんだ付け等により接続される。シールド材４の外周は、シールド材４を保護するための熱収縮チューブ８等で覆われる。 The shield material 4 is a cylindrical and mesh-like conductor (outer conductor) arranged on the outer circumference of the insulating cylinder 3. The shield material 4 corresponds to a ground wire. The ground terminal 4a is pulled out from the shield material 4 by the electric wire 4b to which the ground terminal 4a is connected. That is, one end of the electric wire 4b is connected to the shield material 4 by soldering or the like, and the ground terminal 4a is connected to the other end of the electric wire 4b by soldering or the like. The outer circumference of the shield material 4 is covered with a heat-shrinkable tube 8 or the like for protecting the shield material 4.

端部絶縁部材６は、絶縁筒３の端部にそれぞれ設けられ、絶縁筒３内に芯線２を絶縁支持する。端部絶縁部材６の中央には、芯線２が挿通される孔が形成される。端部絶縁部材６は、絶縁筒３を曲げたときの芯線２の可撓性を考慮して、絶縁筒３とは接着されるが、芯線２とは接着されない。つまり、端部絶縁部材６を介して芯線２を絶縁筒３に備えることで、芯線２と端部絶縁部材６が摺動可能な状態で、芯線２が絶縁筒３に絶縁支持される。端部絶縁部材６は、支持部材５と同様の材料（支持部材５と同じであっても、異なっていても良い）により形成される。 The end insulating member 6 is provided at each end of the insulating cylinder 3, and the core wire 2 is insulatedly supported in the insulating cylinder 3. A hole through which the core wire 2 is inserted is formed in the center of the end insulating member 6. The end insulating member 6 is adhered to the insulating cylinder 3 in consideration of the flexibility of the core wire 2 when the insulating cylinder 3 is bent, but is not adhered to the core wire 2. That is, by providing the core wire 2 in the insulating cylinder 3 via the end insulating member 6, the core wire 2 is insulated and supported by the insulating cylinder 3 in a state where the core wire 2 and the end insulating member 6 are slidable. The end insulating member 6 is formed of the same material as the support member 5 (may be the same as or different from the support member 5).

以上のような、本発明の第１実施形態に係る同軸ケーブル１によれば、高圧側の導体である芯線２が絶縁筒３の中央部に配置され、芯線２とシールド材４の間の大部分が空気層９で構成される。その結果、前述の式（１）で算出される浮遊容量が低減でき、かつ、空気層９による絶縁のためコロナ放電対策が実現できる。 According to the coaxial cable 1 according to the first embodiment of the present invention as described above, the core wire 2 which is the conductor on the high voltage side is arranged in the central portion of the insulating cylinder 3, and is large between the core wire 2 and the shield material 4. The portion is composed of an air layer 9. As a result, the stray capacitance calculated by the above equation (1) can be reduced, and the corona discharge countermeasure can be realized due to the insulation by the air layer 9.

このようにして同軸ケーブル１における浮遊容量が低減されることで、同軸ケーブル１で高速高電圧パルス電源を負荷に接続した際の高速な立ち上がり、立ち下がり時間を得ることができる。また、直流電源の消費電力を低減することができる。 By reducing the stray capacitance in the coaxial cable 1 in this way, it is possible to obtain a high-speed rise and fall time when a high-speed high-voltage pulse power supply is connected to the load in the coaxial cable 1. In addition, the power consumption of the DC power supply can be reduced.

また、本発明の第１実施形態に係る同軸ケーブル１は、絶縁筒３内に支持部材５を設けることで、同軸ケーブル１を折り曲げたとき、芯線２が絶縁筒３の内壁面に接近することが防止される。したがって、支持部材５が無い場合と比較して、大幅に絶縁筒３の中央よりに芯線２を支持することができる。また、支持部材５と芯線２は、互いの位置がずれないように接着剤７等で固定されているので、例えば、図２において矢印Ａで示す部分で同軸ケーブル１を折り曲げたとき、支持部材５が絶縁筒３内を移動して、適宜な位置に収まることとなる。その結果、芯線２が絶縁筒３の中央よりに支持される。 Further, in the coaxial cable 1 according to the first embodiment of the present invention, by providing the support member 5 in the insulating cylinder 3, the core wire 2 approaches the inner wall surface of the insulating cylinder 3 when the coaxial cable 1 is bent. Is prevented. Therefore, the core wire 2 can be significantly supported from the center of the insulating cylinder 3 as compared with the case where the support member 5 is not provided. Further, since the support member 5 and the core wire 2 are fixed with an adhesive 7 or the like so that their positions do not shift from each other, for example, when the coaxial cable 1 is bent at the portion indicated by the arrow A in FIG. 2, the support member 5 is fixed. 5 moves in the insulating cylinder 3 and fits in an appropriate position. As a result, the core wire 2 is supported from the center of the insulating cylinder 3.

つまり、本発明の第１実施形態に係る同軸ケーブル１は、ある程度の曲げＲを確保できるので、パルス電源出力部の近傍に障害物等が備えられるような電源の用途に好ましく適用することができる。 That is, since the coaxial cable 1 according to the first embodiment of the present invention can secure a certain degree of bending R, it can be preferably applied to a power supply application in which an obstacle or the like is provided in the vicinity of the pulse power supply output unit. ..

本発明の第２実施形態に係る同軸ケーブル１０について、図３に基づいて詳細に説明する。同軸ケーブル１０の基本構造は、図１に示した第１実施形態に係る同軸ケーブル１と同様であり、例えば、同軸ケーブル１０の長さに応じて１つ以上の支持部材５が備えられる。後に詳細に説明する他の実施形態に係る同軸ケーブル１４、１６、１７、２１の基本構造も、第１実施形態に係る同軸ケーブル１と同様である。 The coaxial cable 10 according to the second embodiment of the present invention will be described in detail with reference to FIG. The basic structure of the coaxial cable 10 is the same as that of the coaxial cable 1 according to the first embodiment shown in FIG. 1, and for example, one or more support members 5 are provided according to the length of the coaxial cable 10. The basic structures of the coaxial cables 14, 16, 17, and 21 according to the other embodiments described in detail later are also the same as those of the coaxial cable 1 according to the first embodiment.

図３に示すように、本発明の第２実施形態に係る同軸ケーブル１０は、第１実施形態に係る同軸ケーブル１と、絶縁筒１１の形状が異なる。よって、同軸ケーブル１０の説明では、第１実施形態に係る同軸ケーブル１と同様の構成については同じ符号を付し、詳細な説明を省略する。 As shown in FIG. 3, the coaxial cable 10 according to the second embodiment of the present invention has a different shape of the insulating cylinder 11 from the coaxial cable 1 according to the first embodiment. Therefore, in the description of the coaxial cable 10, the same reference numerals are given to the same configurations as those of the coaxial cable 1 according to the first embodiment, and detailed description thereof will be omitted.

同軸ケーブル１０は、内部導体である芯線２と、芯線２が内部に挿通される絶縁筒１１と、絶縁筒１１の外周に配置されるシールド材４と、絶縁筒１１内に芯線２を絶縁支持する支持部材５と、絶縁筒３のそれぞれの端部に設けられる端部絶縁部材１２を備える。 The coaxial cable 10 insulates and supports the core wire 2 which is an internal conductor, the insulating cylinder 11 into which the core wire 2 is inserted, the shield material 4 arranged on the outer periphery of the insulating cylinder 11, and the core wire 2 in the insulating cylinder 11. A support member 5 to be provided and an end insulating member 12 provided at each end of the insulating cylinder 3 are provided.

絶縁筒１１は、例えば、蛇腹状（例えば、絶縁筒１１の軸方向に山折りと谷折りの繰り返した構造）に形成された筒状である。絶縁筒１１の外周には熱収縮チューブ１３が被せられ、熱収縮チューブ１３上にシールド材４が配置される。絶縁筒１１の外周に熱収縮チューブ１３を被せることで、空気層が確保される。第１実施形態に係る同軸ケーブル１の絶縁筒３と同様に、絶縁筒１１は、ＰＴＦＥ等のフッ素系樹脂やＰＥ等のポリオレフィン形樹脂等で形成される。 The insulating cylinder 11 is, for example, a tubular shape formed in a bellows shape (for example, a structure in which mountain folds and valley folds are repeated in the axial direction of the insulating cylinder 11). A heat-shrinkable tube 13 is placed on the outer periphery of the insulating tube 11, and a shield material 4 is arranged on the heat-shrinkable tube 13. An air layer is secured by covering the outer periphery of the insulating cylinder 11 with the heat shrinkable tube 13. Similar to the insulating cylinder 3 of the coaxial cable 1 according to the first embodiment, the insulating cylinder 11 is formed of a fluorine-based resin such as PTFE, a polyolefin-type resin such as PE, or the like.

端部絶縁部材１２は、絶縁筒１１の端部にそれぞれ設けられ、絶縁筒１１に芯線２を絶縁支持する。第１実施形態で説明した端部絶縁部材６と同様に、端部絶縁部材１２は、ＰＴＦＥ等のフッ素系樹脂やＰＥ等のポリオレフィン系樹脂等で形成される。なお、端部絶縁部材１２の絶縁筒１１に挿入される部分の外周面に、絶縁筒１１の蛇腹形状に合わせた溝（図示せず）を形成すると、絶縁筒１１に端部絶縁部材１２をねじ込んで挿入して、絶縁筒１１に端部絶縁部材１２を備えることができる。 The end insulating member 12 is provided at each end of the insulating cylinder 11, and the core wire 2 is insulatedly supported by the insulating cylinder 11. Similar to the end insulating member 6 described in the first embodiment, the end insulating member 12 is formed of a fluororesin such as PTFE or a polyolefin resin such as PE. When a groove (not shown) matching the bellows shape of the insulating cylinder 11 is formed on the outer peripheral surface of the portion of the end insulating member 12 to be inserted into the insulating cylinder 11, the end insulating member 12 is formed in the insulating cylinder 11. The insulating cylinder 11 can be provided with the end insulating member 12 by being screwed in and inserted.

以上のような、本発明の第２実施形態に係る同軸ケーブル１０によれば、第１実施形態に係る同軸ケーブル１と同様に、浮遊容量が低減でき、コロナ放電対策が実現できる。 According to the coaxial cable 10 according to the second embodiment of the present invention as described above, the stray capacitance can be reduced and the corona discharge countermeasure can be realized as in the case of the coaxial cable 1 according to the first embodiment.

また、絶縁筒１１の形状を蛇腹状とすることで、同軸ケーブル１０自体の可撓性が確保される。また、万が一、芯線２がシールド材４に近づいても、絶縁筒１１の蛇腹構造により芯線２とシールド材４の間の距離をある程度確保できる。また、絶縁筒１１の蛇腹構造により形成される空気層により、さらにコロナ放電を防ぐことができる。 Further, by making the shape of the insulating cylinder 11 bellows-shaped, the flexibility of the coaxial cable 10 itself is ensured. Further, even if the core wire 2 approaches the shield material 4, the bellows structure of the insulating cylinder 11 can secure a certain distance between the core wire 2 and the shield material 4. Further, the corona discharge can be further prevented by the air layer formed by the bellows structure of the insulating cylinder 11.

つまり、第１実施形態の同軸ケーブル１と比較しても、本発明の第２実施形態に係る同軸ケーブル１０は、ある程度の曲げＲをさらに確保できるので、パルス電源出力部の近傍に障害物等が備えられるような電源の用途により好ましく適用することができる。 That is, even when compared with the coaxial cable 1 of the first embodiment, the coaxial cable 10 according to the second embodiment of the present invention can further secure a certain degree of bending R, so that an obstacle or the like is located near the pulse power output unit. It can be preferably applied depending on the application of the power source such that the above is provided.

また、端部絶縁部材１２をねじ込み式で絶縁筒１１に固定することで、端部絶縁部材１２の取付けが容易となる。 Further, by fixing the end insulating member 12 to the insulating cylinder 11 by screwing, the end insulating member 12 can be easily attached.

本発明の第３実施形態に係る同軸ケーブル１４について、図４に基づいて詳細に説明する。 The coaxial cable 14 according to the third embodiment of the present invention will be described in detail with reference to FIG.

図４に示すように、本発明の第３実施形態に係る同軸ケーブル１４は、第１実施形態に係る同軸ケーブル１と、支持部材１５の形状が異なる。よって、同軸ケーブル１４の説明では、第１実施形態に係る同軸ケーブル１と同様の構成については同じ符号を付し、詳細な説明を省略する。 As shown in FIG. 4, the coaxial cable 14 according to the third embodiment of the present invention has a different shape of the support member 15 from the coaxial cable 1 according to the first embodiment. Therefore, in the description of the coaxial cable 14, the same reference numerals are given to the same configurations as those of the coaxial cable 1 according to the first embodiment, and detailed description thereof will be omitted.

同軸ケーブル１４は、内部導体である芯線２と、芯線２が内部に挿通される絶縁筒３と、絶縁筒３の外周に配置されるシールド材４と、絶縁筒３内に芯線２を絶縁支持する支持部材１５と、絶縁筒３の端部にそれぞれ設けられる端部絶縁部材６を備える。支持部材１５は、同軸ケーブル１４の長さに応じて１つ以上備えられる。 The coaxial cable 14 insulates and supports the core wire 2 which is an internal conductor, the insulating cylinder 3 into which the core wire 2 is inserted, the shield material 4 arranged on the outer periphery of the insulating cylinder 3, and the core wire 2 in the insulating cylinder 3. A support member 15 and an end insulating member 6 provided at each end of the insulating cylinder 3 are provided. One or more support members 15 are provided depending on the length of the coaxial cable 14.

支持部材１５は、例えば、円盤状であり、芯線２が挿通される中央部１５ａと、絶縁筒３と接する外周部１５ｂの芯線２の挿通方向の厚みが厚く形成される。例えば、中央部１５ａは、絶縁筒３の軸方向にそれぞれ突出する円柱状に形成され、外周部１５ｂは、絶縁筒３の内周と摺動可能な円筒状に形成される。支持部材１５の中央部１５ａには、芯線２が挿通される孔が形成される。支持部材１５に設けられた芯線２は、接着剤７等により支持部材１５に固定される。第１実施形態で説明した支持部材５と同様に、支持部材１５は、ＰＴＦＥ等のフッ素系樹脂やＰＥ等のポリオレフィン形樹脂等で形成される。 The support member 15 has, for example, a disk shape, and the central portion 15a through which the core wire 2 is inserted and the outer peripheral portion 15b in contact with the insulating cylinder 3 are formed to have a large thickness in the insertion direction. For example, the central portion 15a is formed in a columnar shape protruding in the axial direction of the insulating cylinder 3, and the outer peripheral portion 15b is formed in a cylindrical shape slidable with the inner circumference of the insulating cylinder 3. A hole through which the core wire 2 is inserted is formed in the central portion 15a of the support member 15. The core wire 2 provided on the support member 15 is fixed to the support member 15 with an adhesive 7 or the like. Similar to the support member 5 described in the first embodiment, the support member 15 is formed of a fluorine-based resin such as PTFE, a polyolefin-type resin such as PE, or the like.

以上のような、本発明の第３実施形態に係る同軸ケーブル１４によれば、第１実施形態に係る同軸ケーブル１と同様に、浮遊容量が低減でき、コロナ放電対策が実現できる。 According to the coaxial cable 14 according to the third embodiment of the present invention as described above, the stray capacitance can be reduced and the corona discharge countermeasure can be realized as in the case of the coaxial cable 1 according to the first embodiment.

特に、本発明の第３実施形態に係る同軸ケーブル１４は、第１実施形態に係る同軸ケーブル１と比較して、支持部材１５を構成する材料の誘電率により浮遊容量が増える場合に、効果的に浮遊容量を低減することができる。 In particular, the coaxial cable 14 according to the third embodiment of the present invention is effective when the stray capacitance increases due to the dielectric constant of the material constituting the support member 15 as compared with the coaxial cable 1 according to the first embodiment. The stray capacitance can be reduced.

図５は、本発明の第４実施形態に係る同軸ケーブル１６の端部の拡大図である。本発明の第４実施形態に係る同軸ケーブル１６は、図３に示した第２実施形態に係る同軸ケーブル１０に、第３実施形態で説明した支持部材１５を適用したものである。 FIG. 5 is an enlarged view of an end portion of the coaxial cable 16 according to the fourth embodiment of the present invention. The coaxial cable 16 according to the fourth embodiment of the present invention is obtained by applying the support member 15 described in the third embodiment to the coaxial cable 10 according to the second embodiment shown in FIG.

本発明の第４実施形態に係る同軸ケーブル１６によれば、第２実施形態に係る同軸ケーブル１０の奏する効果と、第３実施形態に係る同軸ケーブル１４の奏する効果を併せて得ることができる。 According to the coaxial cable 16 according to the fourth embodiment of the present invention, the effect of the coaxial cable 10 according to the second embodiment and the effect of the coaxial cable 14 according to the third embodiment can be obtained together.

本発明の第５実施形態に係る同軸ケーブル１７について、図６に基づいて詳細に説明する。 The coaxial cable 17 according to the fifth embodiment of the present invention will be described in detail with reference to FIG.

図６に示すように、本発明の第５実施形態に係る同軸ケーブル１７は、第１実施形態に係る同軸ケーブル１と、芯線２と支持部材１８の固定方法が異なる。よって、同軸ケーブル１７の説明では、第１実施形態に係る同軸ケーブル１と同様の構成については同じ符号を付し、詳細な説明を省略する。 As shown in FIG. 6, the coaxial cable 17 according to the fifth embodiment of the present invention differs from the coaxial cable 1 according to the first embodiment in the method of fixing the core wire 2 and the support member 18. Therefore, in the description of the coaxial cable 17, the same reference numerals are given to the same configurations as those of the coaxial cable 1 according to the first embodiment, and detailed description thereof will be omitted.

同軸ケーブル１７は、内部導体である芯線２と、芯線２が内部に挿通される絶縁筒３と、絶縁筒３の外周に配置されるシールド材４と、絶縁筒３内に芯線２を絶縁支持する支持部材１８と、絶縁筒３の端部にそれぞれ設けられる端部絶縁部材６を備える。支持部材１８は、同軸ケーブル１７の長さに応じて１つ以上備えられる。 The coaxial cable 17 insulates and supports the core wire 2 which is an internal conductor, the insulating cylinder 3 into which the core wire 2 is inserted, the shield material 4 arranged on the outer periphery of the insulating cylinder 3, and the core wire 2 in the insulating cylinder 3. A support member 18 and an end insulating member 6 provided at each end of the insulating cylinder 3 are provided. One or more support members 18 are provided depending on the length of the coaxial cable 17.

支持部材１８は、例えば、円柱状の部材である。支持部材１８の中央には、芯線２が挿通される孔が形成される。また、支持部材１８の外周部には、固定ねじ１９（樹脂ねじ）が螺合される溝が形成される。この溝に固定ねじ１９を螺合することで、固定ねじ１９の端部が支持部材１８に支持された芯線２を押圧し、芯線２が支持部材１８に固定される。第１実施形態で説明した支持部材５と同様に、支持部材１８は、ＰＴＦＥ等のフッ素系樹脂やＰＥ等のポリオレフィン形樹脂等で形成される。 The support member 18 is, for example, a columnar member. A hole through which the core wire 2 is inserted is formed in the center of the support member 18. Further, a groove into which the fixing screw 19 (resin screw) is screwed is formed on the outer peripheral portion of the support member 18. By screwing the fixing screw 19 into this groove, the end portion of the fixing screw 19 presses the core wire 2 supported by the support member 18, and the core wire 2 is fixed to the support member 18. Similar to the support member 5 described in the first embodiment, the support member 18 is formed of a fluorine-based resin such as PTFE, a polyolefin-type resin such as PE, or the like.

以上のような、本発明の第５実施形態に係る同軸ケーブル１７によれば、第１実施形態に係る同軸ケーブル１と同様に、浮遊容量が低減でき、コロナ放電対策が実現できる。 According to the coaxial cable 17 according to the fifth embodiment of the present invention as described above, the stray capacitance can be reduced and the corona discharge countermeasure can be realized as in the case of the coaxial cable 1 according to the first embodiment.

また、固定ねじ１９で芯線２を固定することで、芯線２を支持部材１８に固定する接着剤が不要となる。その結果、接着剤が凝固した後の形状による電界集中を防ぐことができる。また、固定ねじ１９と絶縁筒３の内周面の間に空気層２０が形成されることで、コロナ放電対策にもなる。 Further, by fixing the core wire 2 with the fixing screw 19, an adhesive for fixing the core wire 2 to the support member 18 becomes unnecessary. As a result, it is possible to prevent electric field concentration due to the shape of the adhesive after it has solidified. Further, by forming the air layer 20 between the fixing screw 19 and the inner peripheral surface of the insulating cylinder 3, it is also a countermeasure against corona discharge.

本発明の第６実施形態に係る同軸ケーブル２１について、図７に基づいて詳細に説明する。 The coaxial cable 21 according to the sixth embodiment of the present invention will be described in detail with reference to FIG.

図７に示すように、本発明の第６実施形態に係る同軸ケーブル２１は、図４に示した第３実施形態に係る同軸ケーブル１４と、芯線２と支持部材２２の固定方法が異なる。よって、同軸ケーブル２１の説明では、第３実施形態に係る同軸ケーブル１４と同様の構成については同じ符号を付し、詳細な説明を省略する。 As shown in FIG. 7, the coaxial cable 21 according to the sixth embodiment of the present invention differs from the coaxial cable 14 according to the third embodiment shown in FIG. 4 in the method of fixing the core wire 2 and the support member 22. Therefore, in the description of the coaxial cable 21, the same reference numerals are given to the same configurations as those of the coaxial cable 14 according to the third embodiment, and detailed description thereof will be omitted.

同軸ケーブル２１は、内部導体である芯線２と、芯線２が内部に挿通される絶縁筒３と、絶縁筒３の外周に配置されるシールド材４と、絶縁筒３内に芯線２を絶縁支持する支持部材２２と、絶縁筒３の端部にそれぞれ設けられる端部絶縁部材６を備える。支持部材２２は、同軸ケーブル２１の長さに応じて１つ以上備えられる。 The coaxial cable 21 insulates and supports the core wire 2 which is an internal conductor, the insulating cylinder 3 into which the core wire 2 is inserted, the shield material 4 arranged on the outer periphery of the insulating cylinder 3, and the core wire 2 in the insulating cylinder 3. A support member 22 to be provided and an end insulating member 6 provided at each end of the insulating cylinder 3 are provided. One or more support members 22 are provided depending on the length of the coaxial cable 21.

支持部材２２は、例えば、円盤状の部材である。支持部材２２の中央には、芯線２が挿通される孔が形成される。支持部材２２は、芯線２が挿通される中央部２２ａと絶縁筒３と接する外周部２２ｂにおける芯線２の挿通方向の厚みが厚く形成される。支持部材２２の中央部２２ａ（支持部材２２の中央部２２ａと外周部２２ｂを接続する厚さの薄い部分を除く）の側面には、固定ねじ２３（樹脂ねじ）が螺合される溝が形成される。この溝に固定ねじ２３を螺合することで、固定ねじ２３の端部が支持部材２２に支持された芯線２を押圧し、芯線２が支持部材２２に固定される。第１実施形態で説明した支持部材５と同様に、支持部材２２は、ＰＴＦＥ等のフッ素系樹脂やＰＥ等のポリオレフィン形樹脂等で形成される。 The support member 22 is, for example, a disk-shaped member. A hole through which the core wire 2 is inserted is formed in the center of the support member 22. The support member 22 is formed to have a large thickness in the insertion direction of the core wire 2 at the outer peripheral portion 22b in contact with the central portion 22a through which the core wire 2 is inserted and the insulating cylinder 3. A groove into which the fixing screw 23 (resin screw) is screwed is formed on the side surface of the central portion 22a of the support member 22 (excluding the thin portion connecting the central portion 22a and the outer peripheral portion 22b of the support member 22). Will be done. By screwing the fixing screw 23 into this groove, the end portion of the fixing screw 23 presses the core wire 2 supported by the support member 22, and the core wire 2 is fixed to the support member 22. Similar to the support member 5 described in the first embodiment, the support member 22 is formed of a fluorine-based resin such as PTFE, a polyolefin-type resin such as PE, or the like.

以上のような、本発明の第６実施形態に係る同軸ケーブル２１によれば、第３実施形態に係る同軸ケーブル１４と第５実施形態に係る同軸ケーブル１７の奏する効果を、併せて得ることができる。 According to the coaxial cable 21 according to the sixth embodiment of the present invention as described above, the effects of the coaxial cable 14 according to the third embodiment and the coaxial cable 17 according to the fifth embodiment can be obtained together. it can.

以上、具体的な実施形態を示して本発明の同軸ケーブルについて説明したが、本発明の同軸ケーブルは、実施形態に限定されるものではなく、その特徴を損なわない範囲で適宜設計変更が可能であり、設計変更されたものも、本発明の技術的範囲に属する。 Although the coaxial cable of the present invention has been described above by showing a specific embodiment, the coaxial cable of the present invention is not limited to the embodiment, and the design can be appropriately changed as long as its characteristics are not impaired. Yes, the redesigned ones also belong to the technical scope of the present invention.

例えば、図８に示すように、第１実施形態に係る同軸ケーブル１の外周にシールドチューブ２４（アルミ箔シールド等のシールドジッパ）を配置することで、同軸ケーブル１の放射ノイズを低減することができる（他の実施形態に係る同軸ケーブル１０、１４、１６、１７、２１についても同様である）。つまり、シールドチューブ２４を追加し、このシールドチューブ２４をアースに落とすことで、放射ノイズが低減し、同軸ケーブル１周辺への影響を最小限に抑えることができる。特に、負荷が容量性負荷の場合、パルス電流が流れピーク電流が増大し、放射ノイズが発生して同軸ケーブル１周辺の装置に影響を与えるおそれがあるが、シールドチューブ２４を追加することで同軸ケーブル１周辺への影響を最小限に抑えることができる。 For example, as shown in FIG. 8, the radiation noise of the coaxial cable 1 can be reduced by arranging the shield tube 24 (shield zipper such as an aluminum foil shield) on the outer periphery of the coaxial cable 1 according to the first embodiment. (The same applies to the coaxial cables 10, 14, 16, 17, and 21 according to other embodiments). That is, by adding the shield tube 24 and dropping the shield tube 24 to the ground, the radiation noise can be reduced and the influence on the periphery of the coaxial cable 1 can be minimized. In particular, when the load is a capacitive load, a pulse current flows and the peak current increases, which may generate radiation noise and affect the devices around the coaxial cable 1. However, by adding the shield tube 24, it is coaxial. The influence on the periphery of the cable 1 can be minimized.

また、各実施形態の特徴となる構成を組み合わせて同軸ケーブルを構成することで、各実施形態の奏する効果を組み合わせた効果を得ることができる。例えば、図５に示した第４実施形態に係る同軸ケーブル１６において、支持部材１５と芯線２の固定を、図７に示した固定ねじ２３（樹脂ねじ）で行うと、第４実施形態に係る同軸ケーブル１６の効果に加えて、固定ねじ２３で支持部材１５と芯線２を固定した効果を得ることができる。 Further, by forming the coaxial cable by combining the configurations that are characteristic of each embodiment, it is possible to obtain an effect that combines the effects of each embodiment. For example, in the coaxial cable 16 according to the fourth embodiment shown in FIG. 5, when the support member 15 and the core wire 2 are fixed by the fixing screw 23 (resin screw) shown in FIG. 7, it is related to the fourth embodiment. In addition to the effect of the coaxial cable 16, the effect of fixing the support member 15 and the core wire 2 with the fixing screw 23 can be obtained.

１、１０、１４、１６、１７、２１…同軸ケーブル
２…芯線（内部導体）
２ａ…圧着端子
３、１１…絶縁筒
４…シールド材（外部導体）
４ａ…アース端子、４ｂ…電線
５、１８…支持部材
６、１２…端部絶縁部材
７…接着剤
８、１３…熱収縮チューブ
９、２０…空気層
１５、２２…支持部材
１５ａ、２２ａ…中央部、１５ｂ、２２ｂ…外周部
１９、２３…固定ねじ
２４…シールドチューブ 1, 10, 14, 16, 17, 21 ... Coaxial cable 2 ... Core wire (internal conductor)
2a ... Crimping terminals 3, 11 ... Insulation cylinder 4 ... Shielding material (external conductor)
4a ... Earth terminal, 4b ... Electric wire 5, 18 ... Support member 6, 12 ... End insulating member 7 ... Adhesive 8, 13 ... Heat shrinkable tube 9, 20 ... Air layer 15, 22 ... Support member 15a, 22a ... Center Part, 15b, 22b ... Outer peripheral part 19, 23 ... Fixing screw 24 ... Shield tube

Claims

Insulation cylinder and
An internal conductor inserted inside the insulating cylinder and
An end insulating member provided at each end of the insulating cylinder and insulatingly supporting the internal conductor in the insulating cylinder, and an end insulating member.
A support member that is slidably provided in the insulating cylinder and that insulates and supports the internal conductor in the insulating cylinder.
An external conductor provided on the outer circumference of the insulating cylinder is provided.
The inner conductor is provided on the support member in a state where the support member and the inner conductor are fixed.
The coaxial cable is a coaxial cable provided on the end insulating member in a state where the end insulating member and the internal conductor are slidable.

The coaxial cable according to claim 1, wherein the insulating cylinder has a cylindrical shape.

The coaxial cable according to claim 1, wherein the insulating cylinder has a bellows-like shape.

The coaxial cable according to any one of claims 1 to 3, wherein the support member has a columnar shape.

Any of claims 1 to 3, wherein the support member has a disk shape in which a central portion through which the internal conductor is inserted and an outer peripheral portion that is in sliding contact with the insulating cylinder are formed to be thick. The coaxial cable described in item 1.

The support member is provided with a fixing screw that can be screwed and attached.
Any one of claims 1 to 5, wherein the end portion of the fixing screw presses the inner conductor supported by the support member, and the inner conductor is fixed to the support member. The coaxial cable according to item 1.