Invention Grant
- Patent Title: Transmitting type electronic pen and signal transmitting circuit thereof
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Application No.: US16208179Application Date: 2018-12-03
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Publication No.: US10732734B2Publication Date: 2020-08-04
- Inventor: Tomohiro Kagami
- Applicant: Wacom Co., Ltd.
- Applicant Address: JP Saitama
- Assignee: Wacom Co., Ltd.
- Current Assignee: Wacom Co., Ltd.
- Current Assignee Address: JP Saitama
- Agency: Seed IP Law Group LLP
- Main IPC: G06F3/0354
- IPC: G06F3/0354 ; G06F3/044 ; G06F3/038 ; G06F3/041 ; H01F27/28

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.
Public/Granted literature
- US20190101995A1 TRANSMITTING TYPE ELECTRONIC PEN AND SIGNAL TRANSMITTING CIRCUIT THEREOF Public/Granted day:2019-04-04
Information query
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