Piezoelectric substrate, sensor, actuator, biological information acquisition device, and piezoelectric fiber structure

Patent metadata

Field	Value
Publication number	US-11101427-B2
Application number	US-201716348590-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Nov 18, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

Provided is a piezoelectric substrate, containing an elongate piezoelectric body that is helically wound, in which the piezoelectric body includes an optically active polypeptide, a length direction of the piezoelectric body and a main orientation direction of the optically active polypeptide included in the piezoelectric body are substantially parallel to each other, and the piezoelectric body has a degree of orientation F of from 0.50 to less than 1.00, as determined from X-ray diffraction measurement by the following Formula (a):Degree of orientation F=(180°−α)/180°  (a)in Formula (a), α represents a half width (°) of a peak derived from orientation.

First claim

The invention claimed is:

1. A piezoelectric material, comprising
an elongated piezoelectric body that is helically wound, wherein
the piezoelectric body includes an optically active polypeptide,
the optically active polypeptide comprises an animal protein having an optical activity,
a length direction of the piezoelectric body and a main orientation direction of the optically active polypeptide included in the piezoelectric body are substantially parallel to each other, and
the piezoelectric body has a degree of orientation F of from 0.50 to less than 1.00, as determined from X-ray diffraction measurement by the following Formula (a):
Degree of orientation F =(180°−α)/180°  (a)

wherein, in Formula (a), α represents a half width (°) of a peak derived from orientation.

2. The piezoelectric material according to claim 1 , wherein the elongated piezoelectric body is helically wound in a single direction.

3. The piezoelectric material according to claim 1 , further comprising an elongated core material, wherein the elongated piezoelectric body is helically a wound around the elongated core material.

4. The piezoelectric material according to claim 3 , wherein the elongated core material is a conductor.

5. The piezoelectric material according to claim 3 , comprising an outer conductor on an outer peripheral side of the elongated piezoelectric body, wherein the elongated core material and the outer conductor are electrically insulated from each other.

6. The piezoelectric material according to claim 1 , comprising no core material.

7. The piezoelectric material according to claim 1 , wherein the optically active polypeptide has a β sheet structure.

8. The piezoelectric material according to claim 1 , wherein the elongated piezoelectric body comprises a fiber that is composed of the optically active polypeptide.

9. The piezoelectric material according to claim 1 , wherein the optically active polypeptide comprises at least one of fibroin or a spider silk protein.

10. The piezoelectric material according to claim 8 , wherein the fiber that is composed of the optically active polypeptide comprises at least one of a silk or a spider silk.

11. The piezoelectric material according to claim 10 , wherein the silk is refined silk.

12. The piezoelectric material according to claim 1 , wherein
the elongated piezoelectric body is composed of a fiber that is composed of the optically active polypeptide, and
the fiber is a yarn having a number of twists of 500 T/m or less.

13. The piezoelectric material according to claim 1 , wherein the elongated piezoelectric body is wound at a helix angle of from 20° to 70°.

14. The piezoelectric material according to claim 1 , comprising an insulator on the outermost periphery.

15. A sensor comprising the piezoelectric material according to claim 1 .

16. An actuator comprising the piezoelectric material according to claim 1 .

17. A biological information acquisition device comprising the piezoelectric material according to claim 1 .

18. A piezoelectric fiber structure comprising:
a first piezoelectric body comprising a first piezoelectric material, which is the piezoelectric, material according to claim 1 ; and
a second piezoelectric body comprising a second piezoelectric material, which is the piezoelectric material according to claim 1 , in which an optically active polypeptide included in the second piezoelectric body has same chirality as an optically active polypeptide included in the first piezoelectric body of the first piezoelectric material, and a winding direction of the second piezoelectric body is opposite to that of the first piezoelectric body of the first piezoelectric material.

19. A piezoelectric fiber structure comprising:
a first piezoelectric body comprising a first piezoelectric material, which is the piezoelectric material according to claim 1 ; and
a second piezoelectric body comprising a second piezoelectric material, which is the piezoelectric material according to claim 1 , in which an optically active polypeptide included in the second piezoelectric body has a chirality that is different from that of an optically active polypeptide included in the first piezoelectric body of the first piezoelectric material, and a winding direction of the second piezoelectric body is the same as that of the first piezoelectric body of the first piezoelectric material.

Assignees

• Mitsui Chemicals Inc

Inventors

• Tanimoto Kazuhiro
• Yoshida Mitsunobu
• Onishi Katsuki

Classifications

• A61B5/02108

  from analysis of pulse wave characteristics · CPC title

• D02G3/26

  with characteristics dependent on the amount or direction of twist · CPC title

• G01L1/16

  using properties of piezoelectric devices · CPC title

• A61B2562/0219

  Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches · CPC title

• A61B5/1102

  Ballistocardiography · CPC title