Deformation detection sensor and production of the same

Patent metadata

Field	Value
Publication number	US-9939337-B2
Application number	US-201615131548-A
Country	US
Kind code	B2
Filing date	Apr 18, 2016
Priority date	Apr 20, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A deformation detection sensor which combines a magnetic resin dispersing a magnetic filler in a resin with a magnetic sensor, of which stability of detection property is highly enhanced. The deformation detection sensor comprises a magnetic resin-containing polymer foam which comprises a magnetic resin, in which a magnetic filler is contained, and a polymer foam in which the magnetic resin is included, and a magnetic sensor that detects a magnetic change caused by a deformation of the magnetic resin-containing polymer foam, wherein the magnetic resin has an elastic modulus of 0.1 to 10 MPa, and a production thereof.

First claim

What is claimed is:

1. A deformation detection sensor which comprises:
a magnetic resin-containing polymer foam which comprises a magnetic resin, in which a magnetic filler is contained, and a polymer foam in which the magnetic resin is included, and
a magnetic sensor that detects a magnetic change caused by a deformation of the magnetic resin-containing polymer foam,
wherein the magnetic resin has an elastic modulus of 0.1 to 10 MPa.

2. The deformation detection sensor according to claim 1 , wherein an average cell diameter of cells of the polymer foam in the vicinity of an interface between the magnetic resin and the polymer foam is larger than that of cells of a center portion of the polymer foam.

3. The deformation detection sensor according to claim 1 , wherein the magnetic resin and the polymer foam are made of polyurethane.

4. The deformation detection sensor according to claim 1 , wherein the polyurethane which forms the magnetic resin comprises a mono-ol component.

5. The deformation detection sensor according to claim 4 , wherein the mono-ol component is a high polar mono-ol.

6. The deformation detection sensor according to claim 4 , wherein the mono-ol component is contained in an amount of 0.1 to 1.0 meq/g in the total of the polyurethane raw material.

7. The deformation detection sensor according to claim 1 , wherein the magnetic resin and the polymer foam are adhered by self-adhesion.

8. The deformation detection sensor according to claim 1 , wherein the magnetic resin-containing polymer foam is a cushion pad for a vehicle and the deformation to be detected occurs by a sitting of a person.

9. A method for producing a deformation detection sensor, comprising the steps of:
a step of dispersing a magnetic filler in a polyurethane resin precursor comprising a mono-ol component,
a step of curing the resin precursor to form a magnetic resin having an elastic modulus of 0.1 to 10 MPa,
a step of placing the magnetic resin in a mold for a polymer foam,
a step of pouring a polyurethane raw material of the polymer foam into the mold to foam, whereby the magnetic resin is integrated with the polymer foam, and
a step of combining the magnetic resin-containing polymer foam with a magnetic sensor that detects a magnetic change caused by a deformation of the magnetic resin-containing polymer foam.

10. The method of producing the deformation detection sensor according to claim 9 , wherein the mono-ol component is a high polar mono-ol.

11. The method of producing the deformation detection sensor according to claim 9 , wherein the mono-ol component is contained in an amount of 0.1 to 1.0 meq/g in the total of the polyurethane raw material.

12. The method of producing the deformation detection sensor according to claim 9 , wherein the magnetic resin and the polymer foam are adhered by self-adhesion.

Assignees

• Toyo Tire & Rubber Co

Inventors

• Fukuda Takeshi
• Tsuzuki Takuya

Classifications

• G01L1/12 Primary

  by measuring variations in the magnetic properties of materials resulting from the application of stress · CPC title

• B29C44/12

  Incorporating or moulding on preformed parts, e.g. inserts or reinforcements · CPC title

• G01G19/4142

  for controlling activation of safety devices, e.g. airbag systems (electrical circuits for triggering safety arrangements in case of vehicle accidents B60R21/015) · CPC title

• B60N2/002

  Seats provided with an occupancy detection means mounted therein or thereon (detection means responsive to presence or absence of children B60N2/266) · CPC title

• B60N2/7017

  characterised by the manufacturing process; manufacturing upholstery or upholstery springs not otherwise provided for · CPC title