Touch Panel, and Touch-Type Input Apparatus and Control Method Therefor

• US 20150261337A1
• Filed: 06/03/2015
• Published: 09/17/2015
• Est. Priority Date: 05/06/2010
• Status: Active Grant

• Current Assignee: A School Corporation Kansai University, Murata Manufacturing Co Limited
• Original Assignee: A School Corporation Kansai University, Murata Manufacturing Co Limited
• Inventors: Ando, Masamichi, Tajitsu, Yoshiro, Yoshida, Mitsunobu
• Granted Patent: US 9,417,737 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/038 Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/04142 the force sensing means being located peripherally, e.g. disposed at the corners or at the side of a touch sensing plate
• CPC Class Codes: G06F 3/0433 in which the acoustic waves are either generated by a movable member and propagated within a surface layer or propagated within a surface layer and captured by a movable member
• CPC Class Codes: G09G 2300/0404 Matrix technologies
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092

Abstract

A touch panel capable of detecting a pen and a finger, capable of corresponding to multi-touch, capable of detecting pressing force, and capable of reducing the use amount of a transparent electrode as much as possible. The touch panel has a piezoelectric sheet of poly-L-lactic acid having a predetermined stretching axial direction, electrodes that are opposed to each other and formed on the piezoelectric sheet do not cover the entire surface of the piezoelectric sheet and are formed so that they are discretely distributed in plural positions. The piezoelectric sheet is brought into the condition that tension is imparted in directions not coincident with the stretching axial direction.

Claims

1. A touch panel comprising:

a piezoelectric sheet of poly-L-lactic acid having a stretching axis oriented in a predetermined direction; and

a plurality of electrodes on said piezoelectric sheet;

said piezoelectric sheet is in such a condition that tension is imparted in a direction that forms approximately a 45 degree angle with said stretching axis.

2. The touch panel according to claim 1, wherein said piezoelectric sheet has a rectangle shape and said piezoelectric sheet is in such a condition that the tension is imparted in the direction which is coincident with a direction of any one of diagonal lines of the rectangle.

3. The touch panel according to claim 2, further comprising a surface protection film;

wherein said piezoelectric sheet has a first region extending in directions of the diagonal lines and a second region other than the first region;

the second region of said piezoelectric sheet is bonded to said surface protection film with a non-curable adhesive;

the non-curable adhesive has larger elasticity than a material bonding the first region of said piezoelectric sheet to said surface protection film.