Minebea Mitsumi Inc.

Shintaro Takata

Toshiaki Asakawa

Shinya Toda

Shinichi Niwa

Yuta Aizawa

Shigeyuki Adachi

Yusuke Asai

Keiki Maeno

Hideo Fujiura

Tatsuya Takimoto

Daiki Yamamoto

Yukinori Hirai

A strain gauge includes a flexible substrate; a resistor made from a film containing Cr, CrN, and Cr2N, on one surface of the substrate; and a resin barrier layer covering the resistor, and, in this strain gauge, in the barrier layer, a ratio of a moisture permeability (g/m2/24h) to a thickness (mm) is 5:1 or greater, and the thickness of the barrier layer is 100 μm or more and 3 mm or less.

Strain gauge including a barrier layer over a resistance body

A bearing monitoring apparatus includes a rolling bearing, multiple rolling elements, a strain gauge configured to detect strain of the outer ring or the inner ring, the strain gauge including at least two resistors, and the resistors being arranged in a same direction as an arrangement direction of the rolling elements so as to correspond to spacing between rolling elements that are next to each other. The bearing monitoring apparatus includes a first circuit configured to generate a first distorted waveform based on an output of one resistor and to generate a second distorted waveform based on an output of another resistor. The bearing monitoring apparatus includes a second circuit configured to subtract the second distorted waveform from the first distorted waveform to generate a differential waveform. The second circuit is configured to compare the differential waveform against a reference value to detect a wear state of the rolling bearing.

Bearing monitoring apparatus and method for monitoring bearing

The present strain gauge includes a substrate having flexibility; and a resistor formed from a material containing at least one of chromium and nickel, on the substrate, wherein a first substance having a function of preventing crystal grains as the main component of the resistor from cohering, is added to the resistor.

Strain gauge

A strain gauge includes a flexible substrate, and a resistor formed of material containing at least one from among chromium and nickel, on or above the substrate. The resistor includes a first layer that is a lowermost layer; and a second layer that is a surface layer laminated on or above the first layer. The second layer is a layer having a higher density than the first layer. The first layer has a first surface provided on a side where the flexible resin substrate is situated, the functional layer being laminated on the first surface. The first layer has a second surface on which the second layer is laminated.

Strain gauge with improved stability and stress reduction

A strain gauge includes a flexible substrate and a functional layer formed of a metal, an alloy, or a metal compound, the functional layer being directly on one surface of the substrate. The strain gauge includes a resistor formed of a film that includes Cr, CrN, and CrN and that is formed with &#x3b1;-Cr as a main component. The functional layer includes a function of promoting crystal growth of &#x3b1;-Cr and forming an &#x3b1;-Cr based film.

A strain gauge includes a flexible substrate; a functional layer formed of a metal, an alloy, or a metal compound, on one surface of the substrate; and a resistor formed of material including at least one from among chromium and nickel, on one surface of the functional layer.

A strain gauge includes a substrate formed of resin and having flexibility and a functional layer formed of a metal, an alloy, or a metal compound, directly on one surface of the substrate. The strain gauge includes a resistor formed as a film that contains Cr, CrN, and CrN and into which an element contained in the functional layer is diffused. The resistor is provided on one surface of the functional layer. A first substance having a function of controlling growth of crystal grains as a main component of the resistor, is added to the resistor.

Strain gauge including improved stability of temperature coefficient of resistance and gauge factor

A strain gauge includes a flexible resin substrate, and a functional layer formed of a metal, an alloy, or a metal compound, on one surface of the substrate. The strain gauge includes a resistor formed as a film containing Cr, CrN, and CrN, on one surface of the functional layer. The strain gauge includes an insulating layer formed of an inorganic material, the resistor being coated with the insulating layer. The strain gauge includes an insulating resin layer formed of an organic material, the insulating layer being coated with the insulating resin layer.

Strain gauge with increased resistor protection

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; and an oxidation impeding layer formed on a non-oxidized surface corresponding to an upper surface of the resistor.

Growing community of inventors

Nagano, Japan

Shintaro Takata