JPS6342337Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a thermistor sensor used in a temperature sensor, etc., particularly in the lead wire attachment method.

An example of the general structure of a conventional thermistor sensor is shown in Fig. 1, in which lead wires 2, 2', which are bare wires with no insulation coating, are soldered to the thermistor body 1, and connections 3, 3' are made. On the other hand, a pair of exposed conductors 4 and 4' are connected to the ends of lead wires 2 and 2' by soldering with solders 3'' and 3, and finally consists of a thermistor body 1, lead wires (mostly single wires) 2, 2', exposed conductors 4, 4' of insulated covered electric wires 5, 5', and insulated electric wires 5, 5' whose tips are insulated.

Fig. 2 is a structural diagram of another example of a conventional thermistor sensor, in which exposed conductors 4, 4' of insulated wires 5, 5' are soldered to the thermistor body 1 with solders 3, 3', and the final Thermistor body 1,
It consists of insulated wires 5, 5' whose exposed conductors 4, 4' and tips of insulated wires 5, 5' are insulated.

These structures have various problems. First of all
In the structure shown in the figure, the thermistor body 1 has solders 3, 3',
The drawbacks are that thermal shock is applied during the soldering connection processing process with 3", 3, and reliability is reduced due to the large number of thermistor bodies and connection points, and the manufacturing process is complicated. In addition, the structure shown in Figure 2 If the diameter of the exposed conductors 4, 4' of the insulated wires 5, 5' is relatively large compared to the size of the electrodes of the main body 1, the insulated wires 5 may , 5' exposed conductor 4,
The disadvantage is that electrode peeling and cracking of the thermistor occur due to the difference in thermal expansion coefficient between the solder 4', the solder 3, and the thermistor body 1, which is a major cause of deterioration of reliability.

The present invention was developed to eliminate the drawbacks of the lead wires of the conventional thermistor sensor described above, and its outline is to reduce the number of exposed conductors of the insulated wire.
A, 4a' are directly soldered to the thermistor body and then covered with an insulating coating. As a result, the amount of solder 3a, 3a' adhering to the thermistor 1 is smaller than that of 3, 3', which reduces the stress on the thermistor body during the manufacturing process and during use, increasing reliability and reducing the manufacturing process. Therefore, the price can be reduced.

3 and 4 are structural diagrams of a thermistor sensor implementing the present invention. In these figures, the main body of the temperature sensor thermistor 1 includes conductor wires 4, 4', which are obtained by reducing an appropriate number of exposed core wires, that is, conductor wires, from insulated wires 5, 5' having twisted wire cores. They are directly connected by solders 3a and 3a'. The thermistor body 1, the conductor wires 4, 4' whose number is reduced from the exposed conductor strands of the insulated wires 5, 5', and at least the tips of the electric wires 5, 5' are all insulated. The difference in structure between Figures 3 and 4 is clear from the figures, but the length and number of wires 4, 4' exposed from the insulated wires 5, 5' are determined by their heat capacity, ease of work, etc. selected depending on the conditions of use. A comparison between Figure 1 and Figure 1 shows that the structure of the present invention does not require intermediate soldering like 3'' and 3 in Figure 1, and there is no thermal shock to the thermistor body that occurs at that time, so the connection is reliable. The connection area between the electrodes of the thermistor body and the exposed conductor wires is smaller than conventional ones, so the stress on the thermistor body due to changes in detected temperature is reduced, increasing the reliability of the temperature sensor. There are advantages.

[Brief explanation of drawings]

1 and 2 are configuration examples of conventional thermistor sensors, and FIGS. 3 and 4 are configuration diagrams of thermistor sensors according to the present invention. 1... Thermistor body, 2, 2'... Lead wire,
3, 3', 3'', 3, 3a, 3a'...Solder,
4, 4', 4a, 4a'... exposed conductor wire, 5, 5'...
...Insulated wire.

Claims (1)

[Scope of utility model registration request] Leaving a part of the plurality of wires constituting each core wire of a pair of insulated wires, run the other wires at an arbitrary length from the base of the double insulated wire from which the insulation coating has been removed. A thermistor sensor characterized in that after cutting and removing, only one pair of the remaining part of the strands is connected to both electrodes of a thermistor element, respectively, and used as lead wires.