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:
May. 22, 2018
Filed:
Nov. 27, 2015
Topre Corporation, Tokyo, JP;
Shigeki Minezaki, Kanagawa, JP;
TOPRE CORPORATION, , JP;
Abstract
A capacitive keyboard that can detect a key that has been depressed and the depressed amount thereof with high accuracy is provided. The capacitive keyboard includes a drive circuitthat alternatively switches the voltage of each of drive lines M from an L-level to an H-level, a sensing circuitthat is connected to each of sensing lines N and that selects one of the sensing lines N to detect the voltage generated in the selected sensing line, and a control circuit. The control circuitincludes a storage unitincluding storage areas corresponding to keys, a storage control unitthat acquires the voltage generated in the sensing line and that stores the acquired voltage in a storage area corresponding to a key, and a correction unitthat corrects, if one of the keys is operated, the voltage generated as a result of an operation of the one of the keys by using voltages stored in storage areas corresponding to other keys. Thus, even if a plurality of keys are depressed at the same time, detection with high accuracy can be realized.