TECHNICAL FIELD

The present invention relates to a strain gauge and a sensor module.

BACKGROUND ART

Strain gauges that have been known are attached to an object to be measured so as to detect a strain of the object. Such a strain gauge includes a resistor for detecting a strain, and as materials of the resistor, materials containing, for example, Cr (chromium) and/or Ni (nickel) are used. Also, for example, both ends of the resistor are used as electrodes, and a lead wire or the like for external connection is joined to each electrode by solder, so that a signal can be input and output to and from an electronic component (see, e.g., Patent Document 1).

RELATED-ART DOCUMENTS

Patent Documents

[Patent Document 1] Japanese Unexamined Patent Application Publication No. 2016-74934

SUMMARY OF THE INVENTION

Problem to be Solved by the Invention

However, using lead wires for electrical connection between electrodes and an electronic component has a problem that the entire device becomes larger.

The present invention has been made in view of the above point, and has an object to make a strain gauge smaller.

Means for Solving the Problem

The present strain gauge includes a substrate having flexibility; a resistor formed from a material containing at least one of chromium and nickel, on the substrate; a pair of wiring patterns formed on the substrate and electrically connected to both ends of the resistor; and a pair of electrodes formed on the substrate and electrically connected to the pair of wiring patterns, respectively. The wiring patterns include a first layer extending from the resistor, and a second layer having a lower resistance than the first layer and layered on the first layer. On the substrate, an electronic component mounting area is demarcated, on which an electronic component electrically connected to the electrodes is mounted.

Advantage of the Invention

According to the disclosed technique, it is possible to make a strain gauge smaller.

