JPS62266803A - Manufacture of 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 [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, in order to make the platinum resistance element smaller, the wire diameter of the platinum wire must be made smaller.
Alternatively, the only option was to reduce the pitch of the platinum wire coil.

[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 4s on glass with a width and pitch of several microns. -Although there is a method of depositing a thin film of resistor on the core of the winding, it is not possible to manufacture ultra-small resistors, and the precision is not as good as that of wire-wound resistors.

This invention was made in order to solve the above-mentioned problems, and provides a method for manufacturing a platinum resistive element that is smaller than conventional platinum resistive elements and that can be manufactured with high accuracy. With the goal.

Means for Solving Problem C] The method for manufacturing a platinum resistance element according to the present invention is based on a winding core of glass KI! 4 Several platinum wires are wound in close contact with each other in a flat shape, and then one of the even number of platinum wires is wound.
After connecting a lead wire to each -ya part of every other platinum wire, each platinum wire is heated and welded to the winding core, and after removing the platinum wire to which no lead wire is connected, the winding is performed. After setting the platinum wire remaining in the core to the required resistance value, connect the other ends to each other or to the lead wire.
The surface of the winding core and the platinum wire remaining on the winding core is covered with a glass sheath.

[Effect]

In this invention, the insulation between the platinum wires is improved by removing one of the platinum wires wound around the winding core, and by reducing the wire diameter of the platinum wire, the outer diameter of the winding core is also reduced. The platinum wire is covered with a glass sheath and is protected from the outside.

[Implementation row]

FIGS. 1(a), (h), and (c) are process diagrams showing one embodiment of the present invention. First, in FIG. 1(a), 1 is a winding made of a material such as glass, 5.2 is four platinum wires having a predetermined resistance value, and 2A, 2B, 2C, and 2D are each of the platinum wires 20. shows.

Next, the KW manufacturing method will be explained.

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

2B, 2C, and 2D are wound in a state in which they are arranged in a plane in close contact with each other, and wound into 61.

Next, in FIG. 1(b), each platinum wire 2A, 2B.

20. After connecting the lead wires 3 to one end of each of the two platinum wires 2A and 2C in the 2D, the winding core 1 is placed in a heating furnace (not shown) such as an electric furnace, and the platinum wires 2A and 2C are heated. Lines 2A, 2B
, 2C, and 2D are welded to the winding core 1.

Next (・In FIG. 1(c), four platinum wires 2A,
Among the platinum wires 2B, 2C, and 2D, two platinum wires 2B and 2D to which the lead wire 3 is not connected are wound and peeled off from the core 1.

Next, after setting the length of each platinum wire 2A, 2C remaining in the winding core IK so as to have a predetermined resistance value, the platinum wires 2A, 2C are connected to each other at the other end to form one non-inductive winding. platinum wire.

Next, Volume 1, i! A glass sheath 4 is coated on the surface of 1 and each platinum ff12A and 2C.

In addition, FIG. 2 shows each platinum wire 2A, 2B wound around the winding core 1.
, 20.2D, one piece of platinum wire 28.
It is a sectional view showing a mode in which 2D is removed. In this way, the platinum wires 2A and 2C bite into the winding core IK, so they do not move and are held in a stable state.

Further, although four platinum wires 2 were used in the above embodiment, an even number of platinum wires is generally sufficient. And, if it is a non-inductive type (if it is an inductive type, two platinum wires 2 are sufficient in the above case. In this case, only one platinum wire 2 remains at the end, so the lead wire 3 is connected to both ends. Furthermore, if 6 platinum wires 3 are wound at the beginning and 3 are left, 2 of them are considered to be non-inductive type.

The remaining one is an inductive type. The following shall apply accordingly.

〔Effect of the invention〕

As explained above, the present invention involves winding an even number of platinum wires around a glass winding core in a state in which they are closely aligned in a plane, and then every other platinum wire of the even number of platinum wires is wound around a glass core. After connecting a lead wire to each end of the wire, each platinum wire is heated and welded to the winding core, and then, after removing the platinum wire to which the lead wire is not connected, the platinum wire remaining on the winding core is heated. After setting the platinum wire to the required resistance value, connect the other end to the lead wire or connect it to the lead wire, and then cover the surface of the winding core with the platinum wire remaining on the winding core with a glass sheath. Since the platinum wire is coated, 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 winding core can be.

Furthermore, the accuracy of the platinum resistive element itself can be improved, and the platinum wire can be shielded from the outside for protection.

[Brief explanation of drawings]

Figures 1 (a), (b), and (c) are process diagrams showing an embodiment of the present invention, and Figure 2 shows the process of welding several platinum wires wound around a winding core, and then welding every other platinum wire. FIG. 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. 10th

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 the platinum wires to which the lead wires are not connected are removed, and the platinum wires remaining on the winding core are heated to a predetermined resistance value. After setting the platinum wire, the other ends are connected to each other or to a lead wire, and the surfaces of the winding core and the platinum wire remaining on the winding core are covered with a glass sheath. A method of manufacturing a resistive element.