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. 30, 2021
Filed:
Mar. 31, 2020
Alps Alpine Co., Ltd., Tokyo, JP;
Tatsumi Fujiyoshi, Miyagi-ken, JP;
Hiroshi Shigetaka, Miyagi-ken, JP;
Alps Alpine Co., Ltd., Tokyo, JP;
Abstract
An input device that inputs information corresponding to a change in pressure due to load includes: a first charge detection circuit that outputs a first detection signal corresponding to charges generated in a first piezoelectric sensor and a second piezoelectric sensor; and a switch circuit provided on a path through which the charges are transmitted from the first and second piezoelectric sensors to the first charge detection circuit. The first charge detection circuit alternately iterates a first period in which a first charge is input from a first positive electrode via the switch circuit and a second period in which a second charge is input from a second negative electrode via the switch circuit, reverses a sign of one of the first and second charges, combines a resulting charge with the other charge, and outputs the first detection signal corresponding to the amount of accumulation of the combined charge.