Touch panel device

• US 20060181523A1
• Filed: 04/11/2006
• Published: 08/17/2006
• Est. Priority Date: 05/22/2000
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Matsuda, Takashi, Satoh, Yoshio, Sano, Satoshi, Nakazawa, Fumihiko
• Granted Patent: US 7,705,836 B2
• Time in Patent Office: Days
• US Class Current: 345/177
• CPC Class Codes: G06F 3/0436 in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate

Abstract

A plurality of excitation elements are disposed on two facing sides of a quadrilateral detection range in a non-piezoelectric substrate, and a plurality of receiving elements are disposed on the other two sides of the detection range so as to face the excitation elements respectively. Surface acoustic waves are transmitted from the respective plurality of excitation elements in two diagonal directions of the detection range respectively, and the surface acoustic waves from the two diagonal directions are received by the respective receiving elements, so that a position of an object in contact with the substrate is detected based on received results in the receiving elements.

Claims

1. A touch panel device comprising:

a substrate;

a plurality of excitation elements, disposed on two facing sides of a quadrilateral detection range defined on said substrate, for respectively exciting surface acoustic waves; and

a plurality of receiving elements, disposed on the other two facing sides of said detection range, for respectively receiving surface acoustic waves,

said touch panel device being characterized by;

transmitting surface acoustic waves from the respective plurality of excitation elements in two diagonal directions respectively, and receiving the surface acoustic waves from the two diagonal directions by the respective plurality of receiving elements, thus propagating surface acoustic waves across said substrate, between the facing excitation elements and receiving elements; and

detecting a position of an object in contact with said substrate, based on received results in said receiving elements.