JPH0625848Y2 - Electric circuit element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an electric circuit element in which a shape memory alloy and a flexible good electric conductor are combined.

[Prior Art] Recently, shape memory alloys (Shape Memory Al)
(loy) is an alloy that has the dual functions of operating as an actuator by the temperature sensor and its sensor, and its range of use is expanding. For example, S
59.11.9 The Asahi Shimbun (morning edition) introduces various applications to "Kurashi no Kagaku", and KK Agne "Metal" 198
May 54, Vol. 54, No. 5P2-8 describes the practical use of the air-conditioning mechanism of an air conditioner.

When general metal is deformed beyond the elastic limit, it becomes plastically deformed and its shape never returns to its original shape. However, the shape memory alloy recovers its shape even if plastic strain is applied. This is performed by the reversible martensitic transformation of deformation, and the shape memorized at high temperature is transformed at a low temperature below the temperature at which the martensitic transformation occurs. On the contrary, when the temperature is increased to the high temperature, the reverse transformation from the martheinsite phase to the original matrix phase occurs, and the original shape memorized at the high temperature is transformed.

This alloy has Ti-Ni type and Cu type, and Cu type has C
u-Zn alloy, Cu-Al alloy, Cu-Zn-Al alloy, etc. are used. The temperature at which the deformation occurs varies depending on the type of alloy, processing, heat treatment, etc., and the deformation is caused at a predetermined temperature, and various applications have been made.

The conventional use of shape memory alloys is to use a temperature sensor and its mechanical operation, and a thermoswitch (also used to use mechanical operation is used as an element of an electric circuit). ) Was about.

Therefore, as shown in FIGS. 2 (a) and 2 (b), the shape memory alloy wire of (1) is wound in a coil shape to obtain the state of FIG. 2 (b) at high temperature, that is, the coil is tightly wound. The coil shown in FIG. 2 (a) is left in a loosely wound state at room temperature, and when the temperature rises above a predetermined temperature for deformation, the state shown in FIG. 2 (b) is obtained. When this is used in a circuit, it can be used as a variable inductance element.

[Problems to be Solved by the Invention] When the shape memory alloy wire is used as a circuit element as described above, it may be desired to reduce its electric resistance. Further, it is necessary to prevent the deformation operation of the shape memory alloy by reducing the electric resistance. In particular, Ti-Ni
Since the shape memory alloys of the series have high electrical resistance, it was necessary to reduce the electrical resistance to facilitate the flow of electric current, and it was also necessary to reduce the electrical resistance so as not to hinder the shape deformation operation. .

This invention provides a shape memory alloy wire with a plurality of flexible electrically good conductors along the shape memory to reduce electric resistance and also deforms the electrically good conductors according to the shape deformation operation of the shape memory alloy. It is an object of the present invention to provide an electric circuit element whose inductance value can be changed by doing so.

[Means for Solving Problems] An electric circuit element according to the present invention comprises a shape memory alloy wire,
A plurality of flexible electrically good conductors are provided along the shape memory alloy wire.

[Operation] In the electric circuit element according to the present invention, a current flows well in a good electric conductor having flexibility, and shape deformation based on shape memory is smoothly performed.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIG. In FIG. 1 (a), (1) is a shape memory alloy wire, (2) is a flexible good electric conductor, and in this case, a stranded copper wire is used. The shape memory alloy wire (1) is surrounded by a copper stranded wire (2).

In such a configuration, the electric current flows well in the copper stranded wire (2), and when the deformation temperature of the shape memory alloy is reached, the copper stranded wire (2) is flexible, so that the shape memory alloy wire (1) is It does not interfere with the deformation operation of, and changes together to change electrical characteristics such as inductance.

A copper jacket (braided wire) like a shield wire may be used instead of the copper stranded wire.

Generally, for a high frequency current, a conductor having a small number of electric wires on the outside as shown in FIG.

Another embodiment is shown in FIG. 1 (b). In the figure, a copper wire (2) is surrounded by a shape memory alloy wire (1).

In this case, the current flows well in the copper stranded wire (2), and since the copper stranded wire (2) has flexibility, it does not hinder the shape deforming operation.

A copper element wire may be used instead of the copper stranded wire.

In the above examples, copper was used as a good conductor of electricity,
Aluminum, silver, or other good conductor may be used.

[Advantage of Invention] As described above, according to this invention, the shape memory alloy wire is
Since the electric circuit element is formed along the flexible electric conductor, the electric resistance is small, and at the time of the shape deforming operation, there is an effect that the inductance value can be changed without hindering the deforming operation.

[Brief description of drawings]

1 (a) and 1 (b) are cross-sectional views of an electric circuit device according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are views showing the operation of a conventional shape memory alloy wire. In the figure, (1) is a shape memory alloy wire and (2) is a stranded copper wire. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Scope of utility model registration request] 1. A linear shape memory alloy whose shape is deformed at a temperature higher than or equal to a predetermined temperature or lower, and a flexible member which is arranged along the linear shape memory alloy and deforms in accordance with the deformation of the shape memory alloy. An electric circuit element comprising a plurality of electrically conductive good conductors, wherein the inductance value is changed by the deformation of the shape memory alloy due to a change in ambient temperature. 2. The electric circuit device according to claim 1, wherein the electric circuit element is arranged around the shape memory alloy so as to surround a good electrical conductor. 3. An electric circuit element according to claim 1, wherein a shape memory alloy is arranged so as to surround a good electrical conductor. 4. The electric circuit element according to claim 1, wherein the plurality of electrically good conductors are braided copper wires.