JP2008210673A - Connection terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection terminal used for inexpensively and strongly connecting a lead wire to a carbon electrode. <P>SOLUTION: This connection terminal integrally includes a terminal part 12 for connection to the lead wire 22, and a socket contact part 14 holding the carbon electrode 18 for being connected thereto. In a state where the carbon electrode 18 is inserted into the socket contact part 14 and held by a plate spring 14 ((b) column), a cup terminal is formed by an end surface 20 of the carbon electrode 18 and the terminal part 12, and the lead terminal 22 can be firmly soldered in a state brought into direct contact with the carbon electrode 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connection terminal for connecting a lead wire to a rod-shaped body made of a material difficult to connect to a lead wire such as a carbon electrode.

  Carbon is widely used as an electrode, but it is difficult or impossible to solder a lead wire directly with a non-metallic material such as carbon. Therefore, it has been conventionally practiced to plate a metal such as nickel on the surface of the carbon, solder a lead wire to that portion, and harden the periphery with a resin such as an epoxy resin to prevent corrosion.

  However, the plating process has a problem that the cost is high. Also, since there is a difference in the coefficient of thermal expansion between the resin that covers the connection part and the carbon, if the thermal expansion and contraction are repeated, the resin is detached from the carbon, and the soldering is peeled off at the same time, that is, the peeling strength is high. There is also the problem of being small.

  Accordingly, an object of the present invention is to provide a connection terminal that can securely and inexpensively connect a lead wire to a rod-like body made of a material that is difficult to solder, such as a carbon electrode.

  According to the present invention, a soldering terminal portion for soldering a lead wire, and an end portion of a rod-like body that is formed integrally with the soldering terminal portion and is to be connected to the lead wire, are elastically gripped. There is provided a connection terminal that includes a socket contact portion that, when the socket contact portion receives an end portion of the rod-shaped body, the end surface of the rod-shaped body forms a cup terminal together with the soldered terminal portion.

  When a rod-like body is inserted into the socket contact portion as in the case of inserting a pin contact into the socket contact, a cup terminal is formed by the end surface and the soldered terminal portion. Therefore, by soldering the lead wire to the cup terminal, even if the periphery is hardened with an epoxy resin, the soldering is not peeled off together with the release of the epoxy resin, so that it can be firmly joined. In addition, since the end of the lead wire can be soldered in a state where the end of the lead wire is in direct contact with a rod-like body such as a carbon electrode, the lead wire and the electrode can be connected in direct contact with each other.

  FIG. 1 is a perspective view of a connection terminal for connecting a lead wire to a carbon electrode according to an embodiment of the present invention.

  The connection terminal 10 shown in FIG. 1 integrally has a terminal portion 12 for connection with a lead wire and a socket contact portion 14 for connection with a carbon electrode. The material is a metal such as phosphor bronze.

  The socket contact portion 14 has four leaf springs 16 curved inward. As shown in the column (a) of FIG. 2, when the cylindrical carbon electrode 18 is inserted from the direction of the arrow A, the leaf spring 16 is pushed and spread as shown in the column (b). The contact part 14 and the carbon electrode 18 are connected.

  At this time, a cup terminal is formed by the end face 20 of the carbon electrode 18 and the cylinder of the terminal portion 12. As shown in the column (c), the lead wire 22 can be soldered by a cup terminal method by inserting the lead wire 22 and supplying molten solder.

  As shown in the cross-sectional view of FIG. 3, since the lead wire 22 can be soldered in a state in which the lead wire 22 is in contact with the end face 22 of the carbon electrode 18, the lead wire 22 and the carbon electrode 18 are firmly in contact with each other. Can be connected to. In addition, since the soldering is performed by the cup terminal method, the peeling strength is strong as compared with the case where the outer surface of the leaf spring 16 is soldered.

It is a perspective view of the connecting terminal concerning one example of the present invention. It is a figure which shows the procedure of a connection. It is sectional drawing in the connected state.

Claims (1)

A solder terminal for soldering the lead wires;
A socket contact portion formed integrally with the soldering terminal portion, and receiving and elastically holding the end of the rod-like body to be connected to the lead wire;
When the socket contact portion receives the end of the rod-like body, the end surface of the rod-like body forms a cup terminal together with the soldered terminal portion.

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