The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2004
Filed:
Aug. 03, 2001
Tsutomu Yamada, Moriyama, JP;
Toshiyuki Kobayashi, Kameoka, JP;
Gunze Limited, Kyoto, JP;
Abstract
A touch-panel device including a conductive membrane, current measurement resistors which are connected at one end to both ends of the conductive membrane and which are connected at the other end to one another, an oscillator which is connected on one end to the connection point of the current measurement resistors and is connected on its other end to the ground, and a serial connection circuit of a switch and a load impedance which circuit is connected between the ground side of the oscillator and one end of the conductive membrane. The touch-panel device measures voltages V and V of both resistors and calculates R /R =V /(V −V ) by turning the switch ON. When a touch position is to be measured, substitute R /R to the equation of R /R =R (V −V )/R(V1+V2)+V2/(V1+V2) so as to obtain a touch position. Therefore, touch position detection accuracy is improved and the cost is reduced.