JPS62266425A - Manufacture of platinum resistance element - Google Patents

Abstract

PURPOSE:To reduce the size of a resistance element and increase its accuracy by winding an even number of platinum wires around a glass core in close contact and in a planewise arranged condition. CONSTITUTION:Platinum wires 2A-2D are wound around a glass core 1 is close contact and in a planewise arranged condition. Then, after a lead wire 3 is connected to one end of every other platinum wires 2A and 2C in those platinum wires 2A-2D, these are heated to be welded to the core 1. Then, after every other platinum wires 2B and 2D to which the lead wires 3 are not connected are removed, the platinum wires 2A and 2C remaining on the core 1 are dipped and dissolved in an oxidizing solution to be set to required resistance values, being followed by washing and drying. Then, a glass sheath 4 is coated on the surfaces of the core 1 and the platinum wires 2A and 2C remaining thereon. Thus, the pitch and the insulation of the platinum wires are secured, the smaller the diameter of the platinum wire is, the smaller the diameter of the core 1 can be, and the resistance value of the platinum wire can be easily set, so that the accuracy of a resistance element can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a platinum resistance element that is used in thermometers and the like and is small and has excellent insulation performance.

[Conventional technology]

Conventional platinum resistance elements have grooves formed in the glass core.
``A platinum wire was wound around this groove. Therefore, the only way to make the platinum resistance element smaller is to reduce the wire diameter of the platinum wire or to reduce the pitch of the fill of the platinum wire.

[Problem that the invention seeks to solve]

Since the platinum wire used in the conventional platinum resistance element as described above is an extremely thin wire, it is extremely difficult to wind the wire while maintaining a predetermined pitch.

Furthermore, it is impossible to form grooves in glass with a width and pitch of several microns. There is also a method of vaporizing a fl film of a resistor on the winding core, but there are problems in that it is impossible to manufacture ultra-small products and the precision is not as good as that of wire-wound products.

This invention was made in order to solve the above-mentioned problems, and aims to provide a method for manufacturing a platinum resistance element that is smaller than conventional platinum resistance elements and can be manufactured with high precision. purpose.

[Means for solving problems]

The method for manufacturing a platinum resistance element according to the present invention includes winding an even number of platinum wires around a glass core in a state in which they are closely aligned in a plane, and then every other platinum wire among the even number of platinum wires is wound on a glass core. After connecting a lead wire to each end of each of the platinum wires, each platinum wire was heated and welded to the winding core, and then every other platinum wire to which no lead wire was connected was removed.
The platinum wire remaining on the winding core and the surface of the winding core with the platinum wire remaining on the winding core are washed and dried after being wound in an oxidizing solution and immersed in R5 to dissolve the platinum wire remaining on the winding core. This method includes a step of coating a glass sheath.

[Effect]

In this invention, by removing every other platinum wire wound around the winding core, the insulation between the platinum wires is improved, and by reducing the wire diameter of the platinum wire, the outer diameter of the winding core is also reduced. The diameter of the platinum wire can be reduced by the oxidizing action of the oxidizing solution to obtain the required resistance value, and by covering the glass sheath with the button, the platinum wire is shielded from the outside and protected.

〔Example〕

FIGS. 1(a), (b), and (c) are process diagrams showing one embodiment of the present invention. First, in FIG. 1(a), 1 is a winding core made of a material such as glass, 2 is four platinum wires having a predetermined resistance value, 2 people, and 2B, 2C, and 2D are the individual platinum wires 20. shows.

Next, the KaJ manufacturing method will be explained.

First, in FIG. 1<a), four platinum wires 2A.

2B, 2C, and 2D are arranged in a plane in close contact with each other and wound into a winding number r51.

Next, in Figure 1(b), two people on each platinum line, 2B, 2
After connecting the lead wires 3 to every other two platinum wires in C and 2D and one end of the two in 2C, the winding core 1 is placed in a heating furnace (not shown) such as an electric furnace, Platinum @2A, 2B,
2C and 2D are welded to the winding core 1.

Next, in FIG. 1 <c>, the four platinum wires 2A, 2
Among the platinum wires B, 2C, and 2D, two platinum wires 2B and 2D that are not connected to the lead wire 3 are peeled off from the winding core 1.

Next item, volume; Ei I K remaining ivy each platinum 1a 2 people, 2C
are connected to each other at the other ends, and a single non-conductor wound platinum wire 2 is connected to each other at the other end.
shall be.

Next, the winding core 1 around which the platinum wires 2A and 20 are wound is heated with a burner or the like, and the platinum wire 2A is further wound.

2C is more strongly welded to the winding core 1.

Next, add 1. Platinum wires 2A and 2C remaining on the winding core IK are immersed and dissolved in an oxidizing solution mixed with hydrochloric acid at a ratio of 3:3, and the KV# is adjusted to the required resistance value.

That is, since the platinum wires 2A, 2C are dissolved by the solution button, the platinum wires 2A, 2C become thinner and their resistance value increases.

Next, the core 1 and the surface of each of the platinum wires 2A and 2C are covered with a glass sheath 4 after being thoroughly washed and dried with room temperature or heated distilled water so that no solution remains.

In addition, FIG. 2(a) is a cross-sectional view showing a mode in which every other platinum wire 2B, 2D is removed after welding the platinum wires 2A, 2B, 2C, 2D wound with R51 K. The platinum wires 2A and 2C are wound at the same pitch and are completely insulated fiK. FIG. 2(b) is a cross-sectional view showing a state in which the winding core 1 of FIG. 2(a) is further heated so that the two platinum wires are tightly adhered to each other than 2C.

Further, although four platinum wires 2 were used in the above embodiment, generally an even number may be sufficient. If it is an inductive type instead of a non-inductive type, two platinum wires 2 may be used in the above case. In this case, only one platinum wire 1a2 remains, so the lead wires 3 are connected to both ends. Furthermore, if six platinum wires 3 are wound initially and three remain, two of them are of the non-guide type and the remaining one is of the guided type. The following shall apply accordingly.

〔Effect of the invention〕

As explained above, this invention involves winding an even number of platinum wires around a glass winding core in a state in which they are arranged in a planar shape in a dense layer.5 Then, one of the even number of platinum wires is After connecting a lead wire to each end of each platinum wire, each platinum wire was heated and welded to the winding core, and then every other platinum wire to which no lead wire was connected was removed (MRP). After that, the platinum wire remaining on the winding core is immersed in an oxidizing solution and dissolved to set the required resistance value, and then washed and dried. Since the surface is coated with a glass sheath, the pitch and insulation properties of the platinum wire are reliably maintained, and the smaller the wire diameter of the platinum wire, the smaller the outer diameter of the core can be.Furthermore, the resistance value of the platinum wire can be set easily. Since each station is unique, the accuracy of the platinum status element itself can be improved,
Furthermore, it has the advantage that the platinum wire can be shielded from the outside and protected.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (c) are process diagrams showing an embodiment of the present invention, and FIG. 2(a) shows a process of welding a plurality of platinum wires wound around a winding core. FIG. 2(b) is a cross-sectional view showing a state in which the winding core of FIG. 2(a) is further heated and the platinum wire is more tightly adhered to the winding core shown in FIG. 2(a). In the figure, 1 is a winding core, 2, 2A, 2B, 2C, and 2D are platinum wires, 3 is a lead wire, and 4 is a glass sheath. Figure 1 Figure 2 -CZA

Claims (1)

[Claims] An even number of platinum wires are wound around a glass winding core in a state in which they are closely aligned in a plane, and then a lead wire is attached to one end of every other platinum wire among the even number of platinum wires. After connecting, each of the platinum wires is heated to weld to the winding core, and then every other platinum wire to which the lead wire is not connected is removed, and the platinum wires remaining on the winding core are immersed in an oxidizing solution. After setting the required resistance value by dipping and dissolving the platinum wire, washing and drying it, and further covering the surface of the winding core and the platinum wire remaining on the winding core with a glass sheath. A method for manufacturing a platinum resistance element, comprising: