JPS59117101A - Method of connecting terminal of positive temperature coefficient thermistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of connecting terminal boards when constructing a heating element, a sensor, a non-contact switch, etc. using a positive temperature coefficient thermistor.

(Conventional structure and its problems) A positive temperature coefficient thermistor is a semiconductor ceramic whose resistance value increases rapidly at a certain temperature, and is an effective material that can be used in constant temperature heating elements, temperature sensors, non-contact switches, etc. It is well known that it is a square element. Naturally, to use it for these purposes, a voltage is applied to this positive characteristic thermistor,
It is necessary to provide an electrode to detect the change in resistance value, and to attach a terminal plate and a lead wire to the electrode with a simple structure.

Conventionally, as shown in FIG. 1, this type of end 7 connection method involves connecting copper lead wires 6 and 7 to a positive temperature coefficient thermistor 3, which has electrodes 1 and 2 made of fired silver or the like formed on both sides. Half 1]] =
There is a method of removing (=J) using I, 5. As shown in Figure 2, the conventional method of removing (=J) is to have an opening to S1 on one side and a terminal on the bottom. Board] 2. Inside the insulating case 8 with a hole for the 1:3 drawer lead part to pass through ☆J1:
11: Insert the characteristic thermistor 9 and the terminal board 12 in this order, cover with the metal lid 15 through the insulating plate 1/l, and then fix the electrodes 10 and 1.1. Tighten it to fix the whole thing. A part of the terminal plate 13 is bent to give it a positive property, and the force pushes the positive temperature coefficient thermistor to -4-, so that the electrodes 1, 0, 11 and terminal plates 12, 132 are in contact with each other. There is. In yet another conventional method, as shown in FIG. ．．
18 and terminal plates 1.9 and 20 are pressed into contact with each other. Insert these into the insulating case 21 and cover the insulating lid 2.
2 is glued to the above case.

As mentioned above, the conventional method can be broadly divided into (1) fixing lead wires and terminal plates to the electrodes of a positive temperature coefficient thermistor using solder;

■ Press the spring terminal to establish continuity between the terminal board and the positive temperature coefficient thermistor electrode.

There were two. These methods had the following drawbacks. That is, in the method of taking out the terminal board by soldering, flux is used during soldering, so the resistance value decreases after soldering, and the withstand voltage of the positive temperature coefficient thermistor is low. 14 If the stainless steel gets into the minute hole of the positive temperature coefficient thermistor, the flux will carbonize due to the heat and / danger of iodine / will be exposed. In order to prevent these things, it is necessary to sufficiently control the amount of stainless steel during soldering, and it is necessary to thoroughly clean the stainless steel residue after soldering. As a result, the process becomes complicated and mass production is poor.1. It was a good thing. When printing Saitahan U-J3, it is necessary to heat the positive temperature coefficient thermistor to at least 50°C to 80°C higher than the melting temperature of the solder, and the heat at that time is
In this case, the positive temperature coefficient thermistor may have a small rack of 1/1 inch, which may even lead to its destruction. To prevent this, K should be preheated at a low temperature in advance to avoid sudden heating L7 of the positive characteristic thermistor, and then gradually raise the solder temperature to 1 degree (□11A).Therefore, this also applies. The manufacturing efficiency was 7, but it was also time consuming and difficult to mass produce.

The above disadvantage is that the melting point of the solder is high 1i! The more this happens, the more noticeable it becomes. In this case, the flux width 1ν is −
The higher the value, the stronger the effect and the greater the drop in withstand voltage.

(Naturally, the magnitude of the impact will be larger and it will be easier to break. Therefore, in the method of 4-tadatsuki, 1-
1) The melting point is limited.

Furthermore, the quality of the terminal boards used is limited to iron and copper metals, which can be easily soldered. It is difficult ω11, and there are major restrictions on its role.

↓ By the way, the method of holding the thermistor with spring terminals is not affected by stainless steel or heating, but a case-like thing to hold the spring terminals is essential, and even if you simply fix the end plate, there are many parts. It becomes expensive. He's talented.
As an edge board, only those with bad faith can be used, and there are limits to its role in this respect as well.

(Objective of the Invention) The present invention solves the conventional problems as described above, and provides a method for connecting terminals of a positive temperature coefficient thermistor using a small number of parts, a simple process, and no restrictions on the material of the terminal board. It is something.

(Structure of the Invention) The terminal connection method of a PTC thermistor of the present invention involves applying an insulating adhesive to the electrode surface of the PTC thermistor, and curing the adhesive while pressing a metal terminal plate. The terminal plate and the electrode of the positive temperature coefficient thermistor are electrically connected, and the terminal plate is mechanically fixed.

(Description of Embodiment) An embodiment of the present invention will be described below based on the male side drawings. In FIG. 4, a metal terminal plate 24 made of stainless steel or the like is coated with adhesive 28 based on a positive temperature coefficient thermistor 23 provided with electrodes 26 and 27.
25 is placed on the surface of the electrode, and the silicone adhesive is cured while applying force in the direction of the arrow in the figure. As can be seen in the enlarged view of FIG. 4(C), the thus obtained positive characteristic two-mister is hardened while being pressurized, so that the terminal plate 24 is firmly aligned with the convex portion of the electrode 26, which has minute irregularities. Electrical communication is obtained by contacting the Further, since the recess Kfd is filled with the silicon adhesive 28 and hardened, the metal terminal plates 24 and 25 are firmly fixed.

As yet another example, the voltage 11f of a positive temperature coefficient thermistor is
Metal melting in t! An example using No. 11 Denrei will be explained. Gold metal, especially aluminum laminate, is often used as an electrode by thermal spraying because it provides close contact with a positive temperature coefficient thermistor. The present invention mechanically fixes the end plate using only insulating adhesive;
? I'm disappointed in C6, but I explained to him that the surface roughness of the 1st case is 20~20cm.
], 00 micrometers 1-Iin, and the unevenness of the electrode surface becomes 1'i2 (1'i2) (compared to a silver electrode). When connected,
Continuity is poorer than that of silver electrodes, and it is more reliable (higher reliability than silver electrodes).

FIG. 5 shows yet another embodiment of the positive characteristic YAMISTER 2.
9, and then bake a silver electrode 30, etc. on top of it (= If you connect the terminals using the terminal connection method of the present invention using a j order positive characteristic thermistor, the uneven state will be ensured. The surface of the metal sprayed electrode can be controlled to have even more regular irregularities than the surface of the metal sprayed electrode, resulting in high reliability.
1'. At this time, the same effect can be expected even if unevenness is provided in advance on the surface of the metal terminal plate instead of on the surface of the PTC thermistor.

Furthermore, as another example, an example will be described in which a thermosetting adhesive that hardens near the Curie temperature of a positive temperature coefficient thermistor is used as the insulating adhesive. This adhesive is applied to the electrode surface of the positive temperature coefficient thermistor, and a terminal plate is stacked on top of the adhesive, and a voltage is applied to the positive temperature coefficient thermistor while applying pressure to cure it. When a voltage is applied to a positive temperature coefficient thermistor, the positive temperature coefficient thermistor generates heat, and its surface temperature reaches equilibrium near the Ki-ri temperature (I) and becomes stable.The adhesive hardens with the heat. When applying the electric current H-, the positive temperature coefficient thermistor's
FIN 4 You can apply the voltage directly to the body, but you can apply it through the terminal board (if it is 7, make sure that curing is completed within the specified time, then apply the voltage between the terminal board and the electrode of the E-characteristic thermistor). This has the advantage that it can be confirmed that nine letters are sufficient, and quality can be ensured by each station.

The effect of this embodiment is that the positive temperature coefficient thermistor itself generates heat, so that only the part that is most heated, that is, the surface where the adhesive is applied, can be effectively heated. It is possible to save heating energy and reduce the amount of heat added (114 times) compared to that applied externally.

(Effects of the Invention) As is clear from the description of the embodiments, the present invention has two connections between a metal terminal plate and a positive characteristic leakage resistor. 1. The method of wearing both clothes at the same time does not use flux, so (1) City? There is no change in the resistance value of the resistor.

■ Any type of semi-ITI, such as a 2-'f-less or a gamma-shaped miniram, or a metal 1fi can be used as a terminal board without being limited.

■ Since the terminal board can be connected without heating the positive temperature coefficient thermistor more than necessary, there is little thermal shock to the positive temperature coefficient thermistor, which prevents damage and improves quality and yield.

■ Furthermore, since spring terminals and the like are not used, the number of parts is small, the process is simple, and terminal boards can be connected at low cost.

There are other effects.

Note that the present invention does not impose any restrictions on the shape and position of the electrodes of the PTC thermistor or the shape of the terminal plate, and electrodes on the same plane or electrodes attached to the outer or inner wall of a cylindrical PTC thermistor may be used. .

[Brief explanation of the drawing]

1, 2, and 3 are sectional views of conventional examples, FIG. 4 is a configuration diagram of an embodiment of the present invention, and FIG. 5 is a sectional view of a conventional example.
FIG. 4 is a diagram illustrating the main part of another embodiment of the present invention. 23, 29...-1'IE two misc on the hour, 24
．． 25 Terminal board, 26.27.30... Electrode of positive temperature coefficient thermistor, 28 - Insulating adhesive.

Claims (4)

[Claims] (1) Apply an insulating adhesive to the electrode surface of the PTC thermistor, press the metal terminal plate on top of it in the L = state to harden the insulating adhesive, and bond the metal terminal plate and the PTC thermistor together. A terminal connection force method for a characteristic thermistor, which is characterized by electrical continuity with an electrode. (2) Claim No. (2) characterized in that a metal sprayed electrode is used as the electrode of the positive temperature coefficient thermistor.
Terminal connection method of positive temperature coefficient thermistor described in ). (3) The terminal connection method for a PTC thermistor according to claim (1), wherein the electrode surface or metal terminal plate of the PTC thermistor is provided with irregularities in advance. (4) the insulating adhesive is a thermosetting adhesive that hardens near the Curie temperature of the positive temperature coefficient thermistor;
Claim (1) characterized in that, with the metal terminal plate pressed against the electrode surface, a voltage is applied to the positive temperature coefficient thermistor to generate heat, and the adhesive is cured at around the Curie temperature. How to connect the terminals of the positive temperature coefficient thermistor described.