CROSS-REFERENCE TO RELATED APPLICATION

The present application is the U.S. national phase of PCT Application PCT/JP2017/042132 filed on Nov. 24, 2017, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a detection substrate and an assembly having a winding wire part, and method for manufacturing the detection substrate.

BACKGROUND ART

Conventionally, a current detection sensor using a Rogowski coil has been known. The Rogowski coil is a coreless coil, and has a winding core, a winding wire wound around the winding core, and a return wire connected to the terminal end part of the winding wire and returning to a starting end part side (for example, see JP 2012-88224 A). In addition, the Rogowski coil is connected to an integrator, and a change in current in an object to be measured can be measured by integrating the output voltage with the integrator. In such a Rogowski coil, the sensitivity is increased with an increase in the number of turns per unit distance.

Meanwhile, a sensor has been proposed which detects a change in current flowing through a semiconductor device (for example, a switching element). However, conventional sensors cannot detect a change in current flowing through the semiconductor device with sufficient accuracy, and there is a problem that the size of the entire device including the sensor may be increased.

SUMMARY OF INVENTION

Problem to be Solved by Invention

The present invention provides a detection substrate and an assembly that are not too large in size and are capable of accurately detecting an operation, and a method for manufacturing the detection substrate.

Means to Solve the Problem

A detection substrate according to the present invention may comprise:

a body film having a through hole;

a winding wire part provided on a surface of one side of the body film, on a surface of another side of the body film and in the through hole, and disposed so as to surround a current to be detected; and

a winding return wire part, provided on the body film, connected at a terminal end part of the winding wire part and returning from the terminal end part toward a starting end part side.

In the detection substrate according to the present invention,

the winding return wire part may be provided on the surface of the one side of the body film or the surface of the other side of the body film.

In the detection substrate according to the present invention,

the winding return wire part may not pass through the winding wire part.

In the detection substrate according to the present invention,

the winding return wire part may be provided inward or outward of a periphery of the winding wire part.

In the detection substrate according to the present invention,

the winding wire part may have a second straight part provided on the surface of the one side of the body film, a third straight part extending from an end part of the second straight part so as to pass through the through hole, a fourth straight part provided on an end part of the third straight part and provided on the surface of the other side of the body film, and a fifth straight part extending from an end part of the fourth straight part so as to pass through the through hole, and

a plurality of the third straight parts or a plurality of the fifth straight parts may be provided for the fourth straight part.

In the detection substrate according to the present invention,

when a plurality of the third straight parts are provided, a transverse sectional area of each of the third straight parts may be smaller than a transverse sectional area of the second straight part and a transverse sectional area of the fourth straight part, and

when a plurality of the fifth straight parts are provided, a transverse sectional area of each of the fifth straight parts may be smaller than a transverse sectional area of the second straight part and a transverse sectional area of the fourth straight part.

The detection substrate according to the present invention may further comprise:

a detection target part, which is provided in the body part and through which at least a part of current flowing in an object to be measured flows, wherein

the winding wire part and the winding return wire part may be disposed so as to surround the detection target part.

An assembly, according to the present invention, may comprise:

the detection substrate according to claim7; and

an electronic device, which is the object to be measured, disposed on the detection substrate.

A method for manufacturing a detection substrate, according to the present invention, may comprise steps of:

forming a through hole in a body film;

forming a metal film in the body film and the through hole;

forming a metal layer at portions, corresponding to a winding wire part and a winding return wire part, on the metal film; and

removing portions of the metal film other than the portions corresponding to the winding wire part and the winding return wire part, wherein

the winding wire part may be formed by the metal layer and the metal film on a surface of one side of the body film, on a surface of another side of the body film and in the through hole, and

the winding return wire part may be formed by the metal layer and the metal film on the surface of the one side of the body film or the surface of the other side of the body film.

Effects of Invention

The present invention uses a body film in which a winding wire part and a winding return wire part are provided. Use of such body film allows a through hole (via) penetrating the body film to be small. As a result, the number of turns per unit length of the winding wire part can be increased, and changes in current can be accurately detected. Furthermore, by providing a detection substrate as in the present invention, it is possible to detect an operation of an existing semiconductor device or the like, and it is possible to achieve high versatility.

