Input terminal

Patent metadata

Field	Value
Publication number	US-2017192550-A1
Application number	US-201715432283-A
Country	US
Kind code	A1
Filing date	Feb 14, 2017
Priority date	Aug 19, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

An input terminal that includes a casing defining an opening; a holding member; a piezoelectric sensor; and an adhesive material adhering an outer peripheral edge portion of the holding member to an end edge portion of an opening of the casing. The adhesive material includes a first portion and a second portion. The first portion and the second portion differ from each other in at least one of modulus of elasticity, thickness or width.

First claim

1 . An input terminal comprising:
a casing defining an opening; a holding member having a first principal surface and a second principal surface opposing each other; a piezoelectric film having a third principal surface and a fourth principal surface opposing each other, the third principal surface facing the second principal surface of the holding member; a first piezoelectric voltage detecting electrode on the third principal surface of the piezoelectric film; a second piezoelectric voltage detecting electrode on the fourth principal surface of the piezoelectric film; and an adhesive material having a first portion and a second portion, the adhesive material adhering an outer peripheral edge portion of the holding member to an end edge portion of the opening, the first portion of the adhesive material having a first modulus of elasticity, and the second portion of the adhesive material having a second modulus of elasticity different from the first modulus of elasticity.

2 . The input terminal according to claim 1 , wherein the first and second piezoelectric voltage detecting electrodes are configured to detect a voltage corresponding to an amount of strain in the piezoelectric film when a pressing operation is performed on the first principal surface of the holding member.

3 . The input terminal according to claim 1 , wherein the first modulus of elasticity of the first portion of the adhesive material is smaller than the second modulus of elasticity of the second portion of the adhesive material.

4 . The input terminal according to claim 3 , wherein
the holding member has a rectangular planar shape having two long sides and two short sides, the first portion of the adhesive material extends along the two long sides of the holding member, and the second portion of the adhesive material extends along the two short sides of the holding member.

5 . The input terminal according to claim 1 , wherein
the holding member has a rectangular planar shape having two long sides and two short sides, the first portion of the adhesive material extends along the two long sides of the holding member, and the second portion of the adhesive material extends along the two short sides of the holding member.

6 . The input terminal according to claim 1 , wherein the adhesive material adheres an entire outer peripheral edge portion of the holding member to the end edge portion of the opening portion.

7 . The input terminal according to claim 1 , wherein the piezoelectric film is a uniaxially stretched polylactic acid.

8 . An input terminal comprising:
a casing defining an opening; a holding member having a first principal surface and a second principal surface opposing each other; a piezoelectric film having a third principal surface and a fourth principal surface opposing each other, the third principal surface facing the second principal surface of the holding member; a first piezoelectric voltage detecting electrode on the third principal surface of the piezoelectric film; a second piezoelectric voltage detecting electrode on the fourth principal surface of the piezoelectric film; and an adhesive material having a first portion and a second portion, the adhesive material adhering an outer peripheral edge portion of the holding member to an end edge portion of the opening, wherein a first thickness of the first portion of the adhesive material and a second thickness of the second portion of the adhesive material differ from each other, or a first width of the first portion of the adhesive material and a second width of the second portion of the adhesive material differ from each other.

9 . The input terminal according to claim 8 , wherein the first thickness of the first portion of the adhesive material is larger than the second thickness of the second portion of the adhesive material.

10 . The input terminal according to claim 9 , wherein
the holding member has a rectangular planar shape having two long sides and two short sides, the first portion of the adhesive material extends along the two long sides of the holding member, and the second portion of the adhesive material extends along the two short sides of the holding member.

11 . The input terminal according to claim 8 , wherein the first width of the first portion of the adhesive material is smaller than the second width of the second portion of the adhesive material.

12 . The input terminal according to claim 11 , wherein
the holding member has a rectangular planar shape having two long sides and two short sides, the first portion of the adhesive material extends along the two long sides of the holding member, and the second portion of the adhesive material extends along the two short sides of the holding member.

13 . The input terminal according to claim 8 , wherein
the holding member has a rectangular planar shape having two long sides and two short sides, the first portion of the adhesive material extends along the two long sides of the holding member, and the second portion of the adhesive material extends along the two short sides of the holding member.

14 . The input terminal according to claim 8 , wherein the adhesive material adheres an entire outer peripheral edge portion of the holding member to the end edge portion of the opening portion.

15 . The input terminal according to claim 8 , wherein the first and second piezoelectric voltage detecting electrodes are configured to detect a voltage corresponding to an amount of strain in the piezoelectric film when a pressing operation is performed on the first principal surface of the holding member.

16 . The input terminal according to claim 8 , wherein the piezoelectric film is a uniaxially stretched polylactic acid.

17 . An input terminal comprising:
a casing defining an opening; a holding member having a first principal surface and a second principal surface opposing each other; a piezoelectric film having a third principal surface and a fourth principal surface opposing each other, the third principal surface facing the second principal surface of the holding member; a first piezoelectric voltage detecting electrode on the third principal surface of the piezoelectric film; a second piezoelectric voltage detecting electrode on the fourth principal surface of the piezoelectric film; and an adhesive material fixedly adhering an outer peripheral edge portion of the holding member to an end edge portion of the opening; and a deformation obstructing member disposed in an inside of the casing and positioned along an inner periphery of the adhesive material, the deformation obstructing member obstructing a deformation of the holding member when a pressing operation thereof is performed.

18 . The input terminal according to claim 17 , wherein
the holding member has a quadrangular planar shape, and the deformation obstructing member is disposed along at least one side of the holding member.

19 . The input terminal according to claim 17 , wherein
the holding member has a rectangular planar shape having two long sides and two short sides, and the deformation obstructing member is disposed along the two short sides of the holding member.

20 . The input terminal according to claim 17 , wherein the piezoelectric film is a uniaxially stretched polylactic acid.

Assignees

• Murata Manufacturing Co

Inventors

• Kano Hidekazu
• Mori Kenichi
• Ando Masamichi
• Nakaji Hiroyuki

Classifications

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F2203/04105

  Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position · CPC title

• G06F3/041 Primary

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F3/04144 Primary

  using an array of force sensing means (position sensing using the local deformation of sensor cells G06F3/0447) · CPC title