JP2005085721A - Coaxial connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize downsizing and a small space in order to enable to correspond to high density mounting of an electronic parts in an electronic equipment regarding a coaxial connector in a transmission line of an antenna. <P>SOLUTION: In the coaxial connector 1 constituted of a center contact 13 to transmit an electric signal, an outer contact 14 arranged and installed on the outer side via an insulator 15 at the center contact, and a capacitor interposed between the coaxial connector and the center conductor of the connecting coaxial cable connected to the center contact, the capacitor is made a through-capacitor 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a coaxial connector for connecting a coaxial cable and a control printed board, for example, in a wire harness of an automobile or the like.

  As an example, in a car navigation system mounted on an automobile or the like, an electrical signal is transmitted from an antenna to a printed circuit board for control via a wire harness. Since this electric signal is transmitted and received at a high speed, noise due to high frequency is reduced and the impedance of the transmission line is matched.

  The transmission characteristic of the electric signal in the transmission line is configured to correct the capacitance by inserting a capacitor in series with the electric signal line in order to achieve matching with the antenna and improve VSWR (voltage standing wave ratio) and the like. Has been. In that case, the capacitor and the noise filter are mounted on the input / output stage to the coaxial cable of the printed circuit board, or mounted inside the connector of the input / output stage to the printed circuit board in the cable assembly. Yes.

  However, due to high-density mounting on the printed circuit board, there is no room for mounting space, and different types of electronic components such as capacitors are mounted on the printed circuit board with different harnesses for each vehicle type, increasing the number of types of printed circuit boards. There is an inconvenience. Therefore, as shown in the figure, the capacitor 12 is disposed in the coaxial connector 11 on the coaxial cable 10 side, and a capacitor having a capacity corresponding to a frequency to be improved in transmission characteristics is assembled.

  Specifically, as shown in the drawing, the central conductor 10a of the coaxial cable 10 in the wire harness is exposed by peeling off the outer skin 10b, the braided wire 10c, and the insulator 10d, and with leads having lead wires 12a and 12b on it. The lead wire 12b of the capacitor 12 is connected by soldering or crimping via a crimping terminal.

Then, the center contact 13 is connected to the other lead 12a by soldering or crimping via a crimp terminal. Thereafter, as shown in the figure, the braided wire 10c of the coaxial cable 10 is connected to the external contact 14 on the coaxial connector 11 side. Reference numeral 15 denotes an insulator.
JP 2003-173850 A

  However, in the method in which the capacitor 12 with leads as described above is built in the connector 11 on the coaxial cable 10 side, the lengths of the lead wires 12a and 12b of the capacitor 12 and the size of the main body 12c of the capacitor 12 are affected. The length in the connection direction and the length in the direction perpendicular to the connection direction are increased, making it difficult to reduce the size. In the car navigation system, it is necessary to reduce the size of the coaxial connector 11 along with the function expansion, and the coaxial connector 11 needs to be reduced in size.

  The problem to be solved is that the use of the leaded capacitor 12 has a limit in reducing the overall size of the coaxial connector 11 and cannot meet the demand for miniaturization.

  A coaxial connector according to the present invention includes a central contact for transmitting an electrical signal, an external contact disposed outside the central contact via an insulator, and a central conductor of a coaxial cable connected to the central contact. In the coaxial connector composed of a capacitor interposed in the capacitor, the most important feature is that the capacitor is a feedthrough capacitor.

  The coaxial connector of the present invention uses a feedthrough capacitor in place of the leaded capacitor, so that the length of the connector's center contact and the center conductor of the coaxial cable can be shortened and the overall size is reduced. It also gets smaller. Therefore, there is an advantage that the coaxial connector can be easily downsized.

  The object of the present invention is realized by using a feedthrough capacitor.

  A coaxial connector 1 according to the present invention will be described with reference to FIGS. 1 to 3. In addition, the same part as the part which concerns on a prior art example is demonstrated using the same code | symbol as the said prior art example. FIG. 1 is a front view schematically showing a connection state of a simultaneous connector 1 according to the present invention.

  The coaxial connector 1 includes a center contact 13 for transmitting a high-speed signal (electrical signal), an external contact 14 disposed outside the center contact 13 via an insulator 15, the center contact 13 and the center The capacitor 2 is interposed between the central conductor 10a of the coaxial cable 10 connected to the contact 13 and the insulator 15 for insulating the central contact 13 from the external contact 14.

  In the coaxial connector 1, the capacitor 2 is a feedthrough capacitor 2.

To assemble the coaxial connector 1 using the feedthrough capacitor 2, specifically, FIG.
First, the exposed central conductor 10a of the coaxial cable 10 is inserted into the through hole 2a of the feedthrough capacitor 2 with the length thereof being cut.

  As an example, the feedthrough capacitor 2 has a cylindrical body portion 2b having a diameter of approximately φ2 mm, a length of approximately 1.5 mm, and a diameter of the through hole 2a of approximately φ1 mm. The central conductor 10a is soldered and fixed by heating the applied solder paste with a heating device.

  Next, the cylindrical body part 2b of the feedthrough capacitor 2 is inserted into the crimping part 13a of the center contact 13 and is gripped. There are cases where the pressure-bonding portion 13a is gripped by the spring property and cases where the pressure-bonding portion 13a is fixed by soldering.

  Then, the braided wire 10c of the coaxial cable 10 is caulked and connected to the external contact 14, the insulator 15 is fitted to the center contact 13, and these are attached to a synthetic resin case (not shown), or The coaxial connector 1 is completed without using the case. Alternatively, as an assembly procedure different from this, the coaxial cable 10 in which the feedthrough capacitor 2 and the center contact 13 are fixed by an assembly is fitted to the external contact 14 in which the insulator 15 is fitted, and is connected by caulking. There is also a case.

  Thus, by using the feedthrough capacitor for improving the high-speed transmission characteristics, the length in the connecting direction (longitudinal direction) of the coaxial connector 1 is not increased, and the size of the feedthrough capacitor 2 is accommodated in the crimping portion 13a of the center contact 13. Therefore, there is no enlargement than before.

  The second embodiment relates to a method for connecting the feedthrough capacitor 2 and the central conductor 10a of the coaxial cable 10 through a press-fitting interposed member. For this purpose, as shown in FIG. 3, the center conductor 10a is composed of a distal end locking portion 3a having a slit in the center and a base 3b having a cylindrical shape or a shape that can be fixed by caulking, for example. A metal connection terminal 3 is attached in advance.

The connection terminal 3 is firmly fixed to the center conductor 10a by soldering or crimping the center conductor 10a in a hole formed in the cylindrical base 3b.
Thereafter, as an example of the assembly procedure, the front end locking portion 3a of the connection terminal 3 integrated with the coaxial cable 10 is press-fitted into the through hole 2a of the feedthrough capacitor 2. The distal end locking portion 3a having the spring property is constricted by the through hole 2a and press-fitted.

  Then, the feedthrough capacitor 2 is fixed by fitting the cylindrical body portion 2 b to the crimping portion 13 a of the center contact 13. After that, as in the case of the first embodiment shown in FIG. 1, the braided wire 10c of the coaxial cable 10 is caulked and connected to the external contact 14, and the insulator 15 is fitted to the center contact 13, and these are connected. A coaxial connector 1a is completed by attaching to a synthetic resin case (not shown). As another procedure, the coaxial cable 10 in which the feedthrough capacitor 2 and the center contact 13 are fixed to each other by the assembly via the connection terminal 3 is fitted to the external contact 14 fitted with the insulator 15 and caulked. Sometimes connected.

  On the other hand, as another example of the assembly procedure, after the connection terminal 3 is fixed and integrated with the coaxial cable 10, the feedthrough capacitor 2 is first fitted into the crimping portion 13 a of the center contact 13 and held. . Thereafter, the connection terminal 3 is press-fitted into the through hole 2 a of the feedthrough capacitor 2. After that, as in the case of the first embodiment shown in FIG. 1, the braided wire 10c of the coaxial cable 10 is caulked and connected to the external contact 14, and the insulator 15 is fitted to the center contact 13, and these are connected. The coaxial connector 1 is completed by attaching it to a synthetic resin case (not shown).

According to the second embodiment, the feedthrough capacitor 2 and the connection terminal 3 are detachable because they are connected by press-fitting. Therefore, the feedthrough capacitor 2 can be mounted with the coaxial cable 10 or the center contact 13 first, and the degree of freedom in the assembly method is increased.
In addition, since the connection terminal 3 can be removed from the feedthrough capacitor 2 even after assembly, the coaxial cable 10 can be detached or the coaxial connector 1 can be easily disassembled.

It is a front view which shows the internal structure of the coaxial connector 1 of 1st Example which concerns on this invention. It is explanatory drawing which shows the mode of the assembly of the coaxial connector. It is explanatory drawing which shows the mode of the assembly of the coaxial connector 1a which concerns on 2nd Example of this invention. It is a front view which shows the internal structure of the coaxial connector 11 which concerns on a prior art example. It is explanatory drawing which shows the mode of the assembly of the said coaxial connector. FIG. 2 is a front view of the internal structure of the coaxial connector 11 when a leaded capacitor 12 is used.

Explanation of symbols

1,1a coaxial connector,
2 through-capacitor, 2a through-hole, 2b cylindrical body,
3 connection terminal, 3a tip locking part, 3b base part,
10 coaxial cable, 10a center conductor, 10b outer sheath,
10c braided wire, 10d insulator,
11 Conventional coaxial connector,
12 Leaded capacitor,
12a, 12b lead wire, 12c capacitor body,
13 center contact, 13a crimping part,
14 External contact,
15 Insulator.

Claims (1)

Consists of a center contact for transmitting an electrical signal, an external contact disposed outside the center contact through an insulator, and a capacitor interposed between a center conductor of a coaxial cable connected to the center contact In the coaxial connector
The capacitor is a feedthrough capacitor;
Coaxial connector characterized by

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