Bonded structure, method for manufacturing the same, and bonding state detection method

Patent metadata

Field	Value
Publication number	US-10345515-B2
Application number	US-201615537543-A
Country	US
Kind code	B2
Filing date	Jan 6, 2016
Priority date	Jan 15, 2015
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

The purpose of the present invention is to provide a bonded structure, a method for manufacturing the same, and a bonding state detection method which are capable of determining whether or not members are bonded together appropriately. A bonded structure 10 includes a laminated sheet 12A, a laminated sheet 12B, an adhesive 14 that bonds the laminated sheet 12A and the laminated sheet 12B together, and a distributed optical fiber 16 sandwiched between the laminated sheet 12A and the laminated sheet 12B. The cross-sectional shape of the distributed optical fiber 16 is deformed in accordance with the bonding state.

First claim

The invention claimed is:

1. A bonded structure comprising:
a first member,
a second member,
an adhesive that bonds the first member and the second member together, and
a distributed optical fiber sandwiched between the first member and the second member and used as a pressure sensor that functions as a sensor along an entire length of the optical fiber in an axial direction thereof, wherein
the distributed optical fiber is deformed in a radial direction in accordance with a bonding state between the first member and the second member,
a radial deformation of the distributed optical fiber is converted into a contraction or expansion of the distributed optical fiber, and
the bonding state along the axial direction of the distributed optical fiber is continuously detected by axial strain caused by the contraction or expansion of the distributed optical fiber along the axial direction.

2. The bonded structure according to claim 1 , wherein the distributed optical fiber has a property of contracting or expanding when the first member and the second member reach a bonded state compared with a case where the first member and the second member are in an unbonded state.

3. The bonded structure according to claim 2 , wherein when the first member and the second member are in an unbonded state, the distributed optical fiber is arranged in a wave-like shape relative to a lamination direction of the first member and the second member.

4. The bonded structure according to claim 3 , wherein the distributed optical fiber is sandwiched between the first member and the second member via a wave-like member having a wave-like surface.

5. The bonded structure according to claim 3 , wherein a surface of the adhesive that contacts the distributed optical fiber has a wave-like shape.

6. The bonded structure according to claim 3 , wherein at least one of the first member and the second member has a wave-like surface that contacts the distributed optical fiber.

7. The bonded structure according to claim 2 , wherein a cladding that coats a core of the distributed optical fiber is formed with repeating large diameter sections and small diameter sections.

8. The bonded structure according to claim 3 , wherein
the distributed optical fiber is sandwiched between the first member and the second member in a state embedded in a flexible member,
the flexible member has an optical fiber embedment portion in which the distributed optical fiber is embedded, and a plurality of feet protruding from the optical fiber embedment portion, and
the plurality of feet are arranged with spaces therebetween.

9. A method for manufacturing a bonded structure, the method comprising:
a step of applying an adhesive to at least one of a first member and a second member, and
a step of sandwiching a distributed optical fiber used as a pressure sensor, which functions as a sensor along an entire length of the optical fiber in an axial direction thereof, between the first member and the second member to which the adhesive has been applied such that the distributed optical fiber is deformed in a radial direction in accordance with a bonding state between the first member and the second member and a radial deformation of the distributed optical fiber is converted into a contraction or expansion of the distributed optical fiber which allows detection of the bonding state continuously along the axial direction of the distributed optical fiber, and applying pressure, thereby causing axial strain by the contraction or expansion of the distributed optical fiber in the axial direction, and bonding the first member and the second member together.

10. The method for manufacturing a bonded structure according to claim 9 , wherein a radial deformation in the distributed optical fiber that occurs as a result of the pressure application is converted to an axial deformation, and a bonding state between the first member and the second member is detected based on the axial deformation.

11. The method for manufacturing a bonded structure according to claim 9 , wherein the distributed optical fiber is formed from a material that has a property of contracting or expanding when the first member and the second member reach a bonded state compared with a case where the first member and the second member are in an unbonded state.

12. The method for manufacturing a bonded structure according to claim 11 , wherein when the first member and the second member are in an unbonded state, the distributed optical fiber is arranged in a wave-like shape relative to a direction of the first member and the second member.

13. The method for manufacturing a bonded structure according to claim 11 , wherein the distributed optical fiber is sandwiched between the first member and the second member via a wave-like member having a wave-like surface.

14. The method for manufacturing a bonded structure according to claim 11 , wherein a surface of the adhesive that contacts the distributed optical fiber has a wave-like shape.

15. The method for manufacturing a bonded structure according to claim 11 , wherein at least one of the first member and the second member is formed with a wave-like surface that contacts the distributed optical fiber.

16. The method for manufacturing a bonded structure according to claim 11 , wherein the distributed optical fiber is sandwiched between the first member and the second member via a flexible member having an optical fiber embedment portion in which the distributed optical fiber is embedded and a plurality of feet protruding from the optical fiber embedment portion and arranged with spaces therebetween.

17. A bonding state detection method comprising:
a first step of bonding a first member and a second member with an adhesive while sandwiching a distributed optical fiber used as a pressure sensor, which functions as a sensor along an entire length of the optical fiber in an axial direction thereof, between the first and second members such that the distributed optical fiber is deformed in a radial direction in accordance with a bonding state between the first member and the second member and a radial deformation of the distributed optical fiber is converted into a contraction or expansion of the distributed optical fiber, and
a second step of detecting the bonding state between the first member and the second member continuously along the axial direction of the distributed optical fiber, the detecting being based on axial strain caused by the contraction or expansion of the distributed optical fiber converted from the radial deformation in the distributed optical fiber.

18. The bonding state detection method according to claim 17 , wherein the distributed optical fiber is arranged on the first member, a release film, the adhesive and the second member are then stacked thereon and pressure is applied, and an appropriateness of the pressure is detected by the distributed optical fiber.

Assignees

• Mitsubishi Heavy Ind Ltd
• Univ Tokyo

Inventors

• Saito Nozomi
• Shimizu Takayuki
• Abe Toshio
• Minakuchi Shu
• Takeda Nobuo
• Terada Yutaka

Classifications

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title

• G01M11/086

  Details about the embedment of the optical fiber within the DUT · CPC title

• B32B2307/546

  Flexural strength; Flexion stiffness · CPC title

• B32B2250/40

  Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA · CPC title

• B32B9/007

  comprising carbon, e.g. graphite, composite carbon · CPC title