Invention Grant
- Patent Title: Electromagnetic induction type coordinate positioning apparatus
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Application No.: US17111092Application Date: 2020-12-03
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Publication No.: US11221721B2Publication Date: 2022-01-11
- Inventor: Chung-Wen Hsu
- Applicant: Shenzhen Pu Ying Innovation Technology Corp., LTD.
- Applicant Address: CN Shenzhen
- Assignee: Shenzhen Pu Ying Innovation Technology Corp., LTD.
- Current Assignee: Shenzhen Pu Ying Innovation Technology Corp., LTD.
- Current Assignee Address: CN Shenzhen
- Agency: Rabin & Berdo, P.C.
- Priority: CN202010151712.9 20200306
- Main IPC: G06F3/046
- IPC: G06F3/046 ; H01F27/28 ; G06F3/041

Abstract:
An electromagnetic induction type coordinate positioning apparatus includes a first induction coil, a second induction coil, a first impedance circuit, a second impedance circuit, and a control circuit. The first induction coil and the first impedance circuit form a first excited current signal and the second induction coil and the second impedance circuit form a second excited current signal. The control circuit controls a first impedance value of the first induction coil to conform to a first predefined value and controls a second impedance value of the second induction coil to conform to a second predefined value, so that a first excited current signal reaching a first predefined level is formed on a current path between the first impedance circuit and the first induction coil, and a second excited current signal reaching a second predefined level is formed on a current path between the second impedance circuit and the second induction coil.
Public/Granted literature
- US20210278915A1 ELECTROMAGNETIC INDUCTION TYPE COORDINATE POSITIONING APPARATUS Public/Granted day:2021-09-09
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