JPS58213402A - Method of producing platinum resistance element - 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] This invention is applicable to thermometers, hygrometers, heaters, etc.
The present invention relates to a method of manufacturing a platinum resistance element having stable performance in type j).

Figure 1 is a side view showing an example of a conventional platinum resistance element that is extremely small and has a predetermined resistance value. 1 is a cylindrical heat-resistant glass winding core, 2 is a resistance wire made of wire material such as platinum, and the small Two wires with a wire diameter of about 0.025su* are wound from one end 1a of the winding core 1 to the other end 1bK, and the ends of both resistance wires 2 are welded 2a so that a predetermined resistance value is achieved. do,
The outer diameter of the coil is, for example, approximately 0.7511. A lead wire 3 is welded to the other end 2b of the resistor 1ji12 to form a connecting portion 4v. A coating part 5 is formed by melting glass powder by heating and covering the outer periphery of the resistance wire 2.

By the way, the platinum resistance element described above has a drawback that the temperature sensing portion is long, so that errors tend to occur in the measured temperature value.

The present invention was made to eliminate the above-mentioned drawbacks, and provides a platinum resistance element that does not cause measurement errors and can provide stable measurement results.

This invention will be explained below.

FIGS. 2(a) to 2(e) are process diagrams for explaining one embodiment of the present invention.

First, as shown in FIG. 2(a), 11 is a platinum wire, -
As an example, one with an outer diameter of 0.025 mm is used. For example, lead wires 12 and 13 with an outer diameter of 0.2 mm are connected to each terminal 11 a of this platinum wire 11 by welding, and each connecting portion 14 and 15 Y is heated to one end 16 a of a cylindrical winding core 16 made of heat-resistant glass. Embed from somewhere. In addition, the winding core 16 used has an outer diameter of 2 mm and a length of 20 to 25 mm, as an example.

Next, as shown in FIG. 2(b), each platinum wire 11 is wound,
i! ; About 1/3 to 1/40 of the total length of the winding core 16 from one end 16a to the other end 16b (about 5111
The winding is concentrated on one end side 16a (length). Then, each platinum wire 11 is connected at the other end 11b so that the overall resistance value is within a predetermined tolerance range, and the excess is removed by vertical contact between the platinum wires 11, and this connection portion 11c is wound. The connecting portion 11c of the platinum wire 11 is embedded and fixed in the core 16 by heating. Since the length of the connecting portion 11c of the platinum wire 11 varies depending on the resistance value of the resistance wire 11, it may deviate slightly from the predetermined position.

Next, as shown in FIG. 2(c), the lead wires 12°13
The winding core 16 is inserted into the hollow part 1T from one end 16a and pulled out to the other end 16b.Next, as shown in FIG. 2(d), a glass pipe made of the same material as the winding core 16 is inserted. is placed on the part where the platinum wire 11 is wound and one end 16a of the winding core 16, and a coating 111 is applied by heating to fix the platinum wire 11.

Alternatively, as shown in FIG. 2(e), the coating 18A may be applied over the entire length of the trap 1 core 16, including the portion where the platinum wire 11 is not wound.

The hollow portion 1T of the winding core 16 is filled with an inorganic insulator such as MgO, and the other end 16b of the winding core 16 is sealed with an epoxy resin, thereby fixing the lead wires 12 and 13.

FIG. 3 shows another shape of the platinum resistance element formed by the process shown in FIG. 2, with the side surface i showing a long winding; i! ; 16A(
- length 100 fights or more as an example). The length of the platinum wire 110 winding part is the second
This is the same length as the one shown in the figure, about 5 m long, with the length of the part where the platinum wire 11 is not wound longer.

4(a) and 4(b) are partially cutaway side views showing other shapes of the tower of the platinum resistance element enlarged.
In a), the lead wire 12 is branched, and the lead wires 12A, 12
B. It is formed in a 1303-wire system. Figure 4(b)
Similarly, lead wire 12. In branch, lead wire 12A
, 12B, 13A, and 13B.

As explained above, the present invention involves winding a platinum wire from one end of a heat-resistant glass core to the other end, concentrating on one end of the core, and forming a connecting portion between the platinum wire and the lead wire. The platinum wires are embedded in the connecting part of the winding core by heating, and each lead wire is inserted into the hollow part of the winding core and pulled out to the other end. Therefore, there is an advantage that stable temperature measurement results can be obtained without causing errors in temperature measurement values, and a temperature measurement element that is strong and has a long life can be obtained.

[Brief explanation of the drawing]

Figure 1 is a side view showing an example of a conventional platinum resistance element;
Figures (a) to (e) are process diagrams for explaining one embodiment of the present invention, Figure 3 is a side view showing another shape of the platinum resistance element formed by the process of Figure 2, and Figure 4 Figure (a), (
b) is a partially cutaway side view showing still another shape of the platinum resistance element in an enlarged manner. In the figure, 11 is a platinum wire, 12.13 is a lead wire, 14.1
5 is a connecting portion, 16 is a winding core, 17 is a hollow portion, and 18 is a coating.

Claims (1)

[Claims] Connect lead # to one end of each of the two platinum wires,
These connecting parts are embedded in one end of a hollow cylindrical glass winding core, and the two-wire platinum wire is passed from one end of the winding core to the other end by a required length. Concentrate the winding around one end, connect the other ends of each platinum wire wound around the winding core so that the entire platinum wire has a predetermined resistance value, and connect this connected part to the winding core. embedding, pushing each lead # from one end of the core into the hollow part of the core and then pulling it out to the other end, and further applying at least a coating for fixing the platinum wire wound around the core. A method for manufacturing a platinum resistance element, characterized in that the method is applied to a portion where the platinum wire is wound.