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. 17, 2007
Filed:
Sep. 07, 2005
Masahiro Kinoshita, Kyoto, JP;
Hideyuki Urata, Kusatsu, JP;
Hideshi Tsugui, Kyotanabe, JP;
Yoshihiro Tanabe, Uji, JP;
Masahiro Kinoshita, Kyoto, JP;
Hideyuki Urata, Kusatsu, JP;
Hideshi Tsugui, Kyotanabe, JP;
Yoshihiro Tanabe, Uji, JP;
Omron Corporation, Kyoto, JP;
Abstract
Whether a human body is touching or not is detected highly accurately at high speed. Switch SWis turned on to charge condenser Ca by power supply Vcc. The switch SWis turned off to transfer the electric charge charged in the condenser Ca to condensers Cs and Cx. The switches SWand SWare repeatedly turned on and off for a predetermined short time, and thus the electric charge charged in the condenser Ca is slowly discharged through resistor R. The unknown charging voltage Vx of the condenser Cx is compared with the reference voltage Vref by comparator Comp, and the unknown capacitance of the condenser Cx is computed based on the number of times to count turning on and off until it is smaller than the reference voltage Vref. When the computed unknown capacitance of the condenser Cx is the value near the capacitance of a human body, it is determined that a human body is touching. The invention can be applied to a touch sensor.