Electromagnetic touch device and electromagnetic touch method

Abstract

The invention provides an electromagnetic touch device which comprises an antenna board (1), a control processing unit (10) and a detection and judgment unit (11), wherein a transmitting coil and a receiving coil are arranged on the antenna board (1), the transmitting coil is used for transmitting electromagnetic waves to an electromagnetic pen (2), while the receiving coil is used for receiving a resonance signal generated after the electromagnetic pen (2) resonates with the electromagnetic waves transmitted by the transmitting coil, the control processing unit (10) is used for controlling the transmitting coil to transmit signals and the receiving coil to receive signals and processes the signals received by the receiving coils, and the detection and judgment unit (11) is used for detecting the relative position of the electromagnetic pen (2) to the antenna board (1) and sends the position information of the electromagnetic pen (2) to the control processing unit (10); the control processing unit (10) sets the transmission power of the transmitting coil and the induction threshold of the receiving coil according to the relative position of the electromagnetic pen (2) to the antenna board (1).

Description

technical field [0001] The present invention relates to electromagnetic touch technology, in particular to an electromagnetic touch device and an electromagnetic touch method. Background technique [0002] Electromagnetic handwriting technology is favored by many users and companies because of its unique performance such as precision and pressure sensitivity, which makes it very close to the use effect of pens and pencils. The basic principle of electromagnetic handwriting technology is to use the electromagnetic pen with a resonant circuit to move on the antenna board, the resonant circuit is excited by the electromagnetic wave sent by the antenna board's sending coil to emit electromagnetic signals, and receive the electromagnetic signal through the antenna board's receiving coil. [0003] figure 1 It is a structural schematic diagram of the sending coil of the existing electromagnetic tablet. Such as figure 1 As shown, the tablet includes multiple sending coils X 1 、X...

AI Technical Summary

Problems solved by technology

[0004] However, as the load resistance R decreases, the current flowing through the electromagnetic induction coil increases, which will increase power consumption, especially for mobile digital devices.

[0005] In addition, since the existing technology generally adopts a fixed threshold, it will have an impact on handwriting followability

This is because: 1) When the pen is used quickly, the sensing energy of the pen will become smaller, and the phenomenon of pen loss may occur, that is, the handwriting cannot be displayed when the pen is used normally

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