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. 19, 2005
Filed:
Jul. 04, 2002
Motoyasu Yano, Kanagawa, JP;
Masaki Yoshioka, Kanagawa, JP;
Keiichi Shinozaki, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
A capacitance sensor usable as a fingerprint sensor is provided in which a timing controller () provides such a switching control as to first cause a switch (SA) in a sensor cell (-) to turn on to set the potential at a sense electrode to a reference potential and then a switch SB to turn on after the switch (SA) is turned off, whereby charge is stored from the sensor cell (-) into a reference capacitance Cfof a sensing circuit (-), the sensitivity of sensing the capacitance is raised by increasing the number of times the charge storage is repeated and only signal components are extracted by reducing noise components by averaging.