JPS60182101A - 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] Industrial applications The present invention relates to a positive temperature coefficient thermistor device.

For example, it is used as a non-contact switch for automatic demagnetization of color television receivers and the like.

Conventional configuration and its problems A conventional positive temperature coefficient thermistor device of this type is shown in FIG.

As shown in Figure 1, a hole 3 is inserted into a hole in a U-shaped insulating case 4 having two holes made of a synthetic resin material and fixed by caulking, and a terminal bar 2 is attached to this hole 3. The terminal bar 2 of the PTC thermistor 1 is inserted through the terminal bar 2, and the terminal bar 2 and the eyelet 3 are soldered with solder 5, so that the PTC thermistor 1 is supported upright. And U-shaped insulation case 4
The positive temperature coefficient thermistor 1 is covered with a container-shaped insulating case 6 made of a synthetic resin material having an external shape similar to that of the PTC thermistor 1, and the outer circumference of the container-shaped insulating case is glued or fused. has been done.

However, in such a conventional configuration, although the U-shaped insulating case 4 and the container-shaped insulating case 6 have similar external shapes, they are completely different in shape, so two case molding molds are required. Eyelet 3 inserted into the hole of U-shaped insulation case 4
There are problems such as the fact that two are required and a process of crimping and fixing them, and that the eyelet 3 and the terminal bar 2 must be soldered and the positive temperature coefficient thermistor 1'f: must be supported upright. Purpose of the Invention In view of the above-mentioned drawbacks, the present invention has the drawbacks of providing a positive temperature coefficient thermistor device that is very expensive in terms of the number of parts, molds, man-hours, assembly equipment, etc. It is constructed with the minimum number of parts required, standardizes molds, reduces man-hours, and simplifies assembly equipment, saving resources and making it cheaper to fill.
The purpose of this invention is to provide a positive temperature coefficient thermistor device.

Structure of the Invention In order to achieve this object, the PTC thermistor device of the present invention includes a PTC thermistor with a terminal bar attached to two insulating cases of the same shape each having a groove for guiding the terminal bar in a part thereof. the positive temperature coefficient thermistor is supported upright by the terminal bar between the two insulating casings, and the positive temperature coefficient thermistor is held in place without contacting the cases. The two insulating cases are fitted and fixed by fitting claws and fitting recesses provided on each of the two insulating cases.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a cross-sectional view of the PTC teamistor device in this embodiment. FIG. 4 is an exploded perspective view thereof.

In Figures 3 and 4, 7 is a positive temperature coefficient thermistor, 8 is a terminal bar%9&, 9b is an insulating case, 10 is a groove that guides the terminal bar 8, 11 is a self-supporting bottom, a double-shaped flange, and 12 is a fitting. A matching claw 13 is a fitting recess, and these claws 12 and the recess 13 are an insulating case 9a.

They are provided diagonally on a part of the inner wall of 9b. Note that the insulating cases 92L and 9b have the same shape. A portion of the terminal bar 8 is formed with at least two forms, and when the terminal bar 8 is inserted into the +l/J 1o of the insulating cases 9a and 9b, the forming causes the terminal bar 8 to move in the length direction of the groove 10. It has a stopper to prevent it from happening.

The forming part of the terminal bar 8 attached to the positive temperature coefficient thermistor 7 is placed on the groove 1o of the insulating case 9a, and in this state, the insulating case 9b is positioned over the above-mentioned insulating case 9&. Here, as mentioned above, VrC insulation cases 9a and 9
b have the same shape, and the groove 1° is also at the same position on both. These insulating cases 9a and 9b are completely fitted together by the fitting claws 12 and the fitting recesses 13 to insulate the positive temperature coefficient thermistor 7 from the outside.At this time, the insulating cases 92
L.

The hollow positive temperature coefficient thermistor 9b is positioned upright and supported by the terminal bar 8, and does not come into contact with the insulating case 9J9-D as shown in FIG. When it is inserted into a container, it becomes self-supporting due to the self-supporting geta mold casting 11.

With this configuration (therefore, if the terminal bar 8 is passed through and the positive charge 11 thermistor 7 is energized, the positive characteristic thermistor γ will self-heat, and as shown in Fig. 5, the resistance value will sharply and significantly increase at a certain temperature as the temperature rises. However, as shown in FIG. 6, it becomes a non-contact switch having a so-called current attenuation characteristic that attenuates the current.

By applying this to the degaussing circuit of a color television receiver, it is possible to efficiently demagnetize the cathode ray tube. FIG. 6 typically shows, for example, AC current attenuation characteristics.

Effects of the Invention The present invention is constructed as described above, and unlike the conventional case, the structures of the two insulating cases are not different and have exactly the same shape, so only one mold is required, and the joint Since the terminal rod is brought into close contact with the groove of the case and the custom-made teamister is sandwiched between the two, grommet and solder as required in the past are no longer required, reducing the number of parts, thereby reducing assembly man-hours and equipment. This has the effect of providing an hourly thermistor device that is simple, has an improved assembly yield, and is overall inexpensive, and has the effect of saving resources and labor. In terms of performance, the structure in which the positive temperature coefficient thermistor is positioned in a hollow space inside the insulating case and insulated from the outside is the same as the conventional one, so there is no loss of performance.In addition, the structure is easy to make free-standing. For.

Soldering after inserting the printed circuit board is easy, and it has the effect of being easy to handle.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional PTC thermistor device, FIG. 2 is a perspective view thereof, FIG. 3 is a sectional view of a PTC thermistor device according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view thereof.
Fig. 5 is a diagram showing an example of the resistance temperature characteristics of the positive characteristic thermistor used in the same device, and Fig. 6 is a diagram showing an example of the current attenuation characteristic. 7...Positive characteristic thermistor , 8...Terminal bar, 9a. 9b...Insulation case, 10...Pa...groove, 1
2... Fitting claw, 13... Fitting recess. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 5 Figure 6

Claims (1)

[Claims] A positive temperature coefficient thermistor with a terminal bar is covered with two insulating cases having the same shape, each of which has a groove for guiding the terminal bar, and a part of the terminal bar is brought into close contact with the groove of the insulating case. and the positive temperature coefficient thermistor is supported upright by the terminal rod in the two insulating cases, and is held between the two insulating cases without contacting the cases, and the two insulating cases are provided with fitting claws and fitting recesses respectively. A positive temperature coefficient thermistor device formed by mating and bonding.