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:
Apr. 22, 2014
Filed:
Jan. 30, 2012
Hsiang-yu Lee, New Taipei, TW;
Ping-tsun Lin, Taipei, TW;
Hsiang-Yu Lee, New Taipei, TW;
Ping-Tsun Lin, Taipei, TW;
Invention Element Inc., Taoyuan County, TW;
Abstract
A minute impedance variation detection device includes a differential amplifier, first and second impedances, a sensing electrode and a signal source. The differential amplifier has first and second input ends and an output end. The first impedance is connected to the first input end. The second impedance is connected to the second input end. The sensing electrode is connected to the second input end for sensing a touch and thus receiving a touch signal. The signal source is connected to the first impedance and the second impedance for providing an input signal inputted to the first impedance and the second impedance. The first impedance has an impedance value close to that of the second impedance. The differential amplifier is based on the input signal and the touch signal to differentially amplify the touch signal.