JPS6022564Y2 - Positive characteristic thermistor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a positive temperature coefficient thermistor device coated with a heat-shrinkable tube.

Conventionally, in positive temperature coefficient thermistors and other electronic components,
Generally, they were enclosed in a resin case for electrical insulation and to prevent dust.

In recent years, heat-resistant heat-shrinkable tubes have come into wide use due to reasons such as cost, miniaturization, and other factors, and simple insulation methods have come to be used.

Since this heat shrink tube has a shrinkage rate of 20 to 50%, the spring terminal 2 is connected to the insulating base 3 as shown in FIG.
, the PTC thermistor element 1 was held between the spring terminals 2, and the insulating tube 4 was covered. One end of the tube 4 is on the base 3 surface, and the other end is opened like a chimney, so dust cannot be collected. There was a risk of deterioration of properties or destruction due to intrusion.

Furthermore, a device shown in FIG. 2 which is similar to FIG. 1 has been devised (Japanese Utility Model Publication No. 51-155336), but it does not solve the above-mentioned drawbacks.

The present invention was devised to eliminate the above-mentioned drawbacks, and will be described with reference to an embodiment shown in FIG.

Figure 3 shows the PTC thermistor device of the present invention, A is a perspective view before covering the heat shrink tube, the opening is a front view, and C is a sectional view of the main part, in which a part of the PTC thermistor element is covered. A spring terminal 12 having an elastic piece is attached to an insulating base 13 made of heat-resistant resin or ceramic, and provided with a recess 15.
are attached to each terminal, and a positive temperature coefficient thermistor element 1 is connected between the terminals 12.
1 is inserted into the recess 15 of the base 13 and held, the heat shrink tube 14 is placed over the recess 15 of the base 13, and the heat shrink tube 14 is shrunk in a heating tank or a heating furnace. In this PTC thermistor device, the shrink opening end 16 of a heat shrink tube is sealed by crimping. One open end 16 of is crimped.

In addition, when sealing the shrink opening end 16 of the heat-shrinkable tube 14 by crimping, the crimping can be welded by pressing the opening from both sides while maintaining the flexibility of the tube immediately after heat-shrinking. .

However, since the purpose is to prevent dust, complete welding is not necessary.

Further, in the embodiment, a concave portion 15 is formed in a convex portion where a part of the PTC thermistor element 11 is provided on the base 13,
Although it is covered by the recess 15, the recess may not be provided.

The positive temperature coefficient thermistor device of the present invention manufactured in this way prevents dust from entering when installed or incorporated into electrical equipment or electronic equipment, and prevents the characteristic deterioration or destruction of the positive temperature coefficient thermistor element due to external factors. It is useful for security and industrial purposes.

[Brief explanation of the drawing]

Figures 1 and 2 show conventional positive temperature coefficient thermistors;
The figure is a sectional view, Figure 2 is a perspective view of another example, and Figure 3 is an embodiment of the PTC thermistor device of the present invention. Figures 1 and 2 are cross-sectional views of main parts. 11...Positive characteristic thermistor element, 12...
... Spring terminal with elastic piece, 13 ... Insulation base, 14 ... Heat shrink tube, 15 ...
...Recessed part of insulation base, 16... Shrinkage opening end.

Claims (2)

[Scope of utility model registration request] (1) A terminal with an elastic piece is fixed to an insulating base made of heat-resistant resin or ceramic, which has a convex part that supports a part of the PTC thermistor element, and the PTC thermistor element is placed between the elastic pieces of the terminal. After being inserted and clamped, the positive temperature coefficient thermistor device is covered with a heat shrinkable tube so as to cover the positive temperature coefficient thermistor element and the convex portion provided on the insulating base, and one of the ends of the heat shrinkable tube is crimped and sealed. (2) A utility model according to claim 1, characterized in that a concave hole is formed in the convex portion provided on the insulating base, and a part of a positive temperature coefficient thermistor element is inserted into the concave hole. Positive characteristic thermistor device.