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:
Aug. 04, 2020
Filed:
Dec. 03, 2018
Wacom Co., Ltd., Saitama, JP;
Tomohiro Kagami, Tokyo, JP;
Wacom Co., Ltd., Saitama, JP;
Abstract
A signal transmitting circuit prevents oscillation efficiency from dropping regardless of changes in transmission signal frequency. The signal transmitting circuit includes a switch circuit that enables a current to flow to a resonance circuit including a capacitor and a coil to provide energy that sustains resonance of the resonance circuit, and a control signal generating circuit that generates a control signal to control changeover of the switch circuit, thereby outputting a transmission signal having a resonance frequency of the resonance circuit. The control signal generating circuit includes a detection circuit that detects a cycle of the transmission signal, a timing generating circuit that generates a timing point at which the changeover control signal is generated based on a detection result of the detection circuit, and a drive circuit that generates the control signal at the timing point generated by the timing generating circuit to control changeover of the switch circuit.