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:
Oct. 13, 2020
Filed:
Feb. 12, 2019
Wacom Co., Ltd., Saitama, JP;
Susumu Yamada, Gunma, JP;
Wacom Co., Ltd., Saitama, JP;
Abstract
An electronic circuit of an electronic pen includes an integrated circuit, and a resonant circuit that is formed of a parallel circuit of a coil and a first capacitor and is externally connected to the integrated circuit. The integrated circuit includes a variable-capacitance circuit which, in operation, adjusts a frequency of the resonant circuit, and has a connection pin connecting the variable-capacitance circuit to outside of the integrated circuit. A first end of the parallel circuit is grounded and a second end of the parallel circuit is connected to a first end of a second capacitor externally connected to the integrated circuit. A second end of the second capacitor is connected to the connection pin of the integrated circuit and is connected to a diode which, in operation, clamps a potential of the second end of the second capacitor to a predetermined value.