Touch type input terminal

Patent metadata

Field	Value
Publication number	US-9720533-B2
Application number	US-201414453745-A
Country	US
Kind code	B2
Filing date	Aug 7, 2014
Priority date	Feb 15, 2012
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A touch type input terminal that includes a base substrate, a piezoelectric sensor and an electrostatic sensor which are flat membrane-shaped, respectively. The electrostatic sensor includes a plurality of segment electrodes on a first main surface of a base film and a plurality of common electrodes on a second main surface. The piezoelectric sensor includes a piezoelectric film formed of PLLA drawn uniaxially. Displacement detecting electrodes are formed on a third main surface of the piezoelectric film so as to divide the third main surface into four portions. Displacement detecting electrodes are formed on a fourth main surface of the piezoelectric film so as to be opposed to the displacement detecting electrodes on the third main surface.

First claim

The invention claimed is:

1. A touch type input terminal comprising:
a touch position detecting panel including:
a flat main body having a first main surface and a second main surface opposed to the first main surface; and
electrostatic capacity detecting electrodes on the first main surface and the second main surface;
a single, unitary, flat piezoelectric film having a third main surface and a fourth main surface which are opposed to each other;
a first displacement detecting electrode on the third main surface, the first displacement detecting electrode including a first plurality of divided portions; and
a second displacement detecting electrode on the fourth main surface, the second displacement detecting electrode including a second plurality of divided portions, wherein each of the first plurality of divided portions are opposed to at least one of the second plurality of divided portions, and each of the first and second plurality of divided portions detecting a respective voltage generated by a displacement due to at least one of a bend and a twist of the piezoelectric film, the respective voltages indicating a voltage distribution of a bending quantity and bending direction or a twisting quantity and twisting direction,
wherein the first main surface and the second main surface, and the third main surface and the fourth main surface are arranged to overlap with each other.

2. The touch type input terminal according to claim 1 , wherein the first plurality of divided portions extend in a first direction and the second plurality of divided portions extend in a second direction which is orthogonal to the first direction.

3. The touch type input terminal according to claim 2 , wherein the piezoelectric film is polylactic acid that was drawn uniaxially in a parallel direction with the third main surface and the fourth main surface.

4. The touch type input terminal according to claim 3 , wherein a direction of the uniaxial drawing of the piezoelectric film is parallel with the first direction.

5. The touch type input terminal according to claim 3 , wherein a direction of the uniaxial drawing of the piezoelectric film is along a predetermined angle with respect to the first direction and the second direction.

6. The touch type input terminal according to claim 1 , wherein the first plurality of divided portions and the second plurality of divided portions are each divided into four parts.

7. The touch type input terminal according to claim 6 , wherein each of the four parts of the first plurality of divided portions are aligned opposed to a respective one of the four parts of the second plurality of divided portions.

8. The touch type input terminal according to claim 1 , further comprising a base substrate between the touch position detecting panel and the piezoelectric film.

9. The touch type input terminal according to claim 1 , wherein the voltage distribution is different between the bend and the twist of the piezoelectric film.

Assignees

• Murata Manufacturing Co

Inventors

• Ando Masamichi

Classifications

• G01B7/003

  for measuring position, not involving coordinate determination (coordinate measuring G01B7/004) · CPC title

• G01B7/14

  for measuring distance or clearance between spaced objects or spaced apertures (G01B7/30 takes precedence) · CPC title

• G01L1/16

  using properties of piezoelectric devices · CPC title

• G06F3/041 Primary

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

• G06F3/03

  Arrangements for converting the position or the displacement of a member into a coded form · CPC title