Electromagnetic induction device with multi-touch function

Abstract

The invention discloses an electromagnetic induction device with a multi-touch function, which comprises an electromagnetic pen used for inputting a figure, and an electromagnetic induction board usedfor detecting a track of the input figure. A resonance circuit is arranged in the electromagnetic pen; an electromagnetic wave emitter, an electromagnetic wave receiver, a primary MCU and a secondaryMCU are arranged in the electromagnetic induction board, wherein the secondary MCU of the electromagnetic induction board receives an instruction of the primary MCU to control the electromagnetic wave emitter to emit electromagnetic waves of different frequencies; the electromagnetic pen generates corresponding resonance frequencies; and the electromagnetic wave receiver receives electromagneticharmonic waves of the same resonance frequency and detects the electromagnetic pen information of the different resonance frequencies. The device implements the multi-touch function of a wireless passive electromagnetic induction device, can be convenient for users to input coordinates, pressure and inclination angle information on the electromagnetic pen, enables a plurality of electromagnetic pens to cooperate to realize self-defined functions, such as picture scaling and the like, and greatly widens the application range of the electromagnetic induction board.

Description

technical field [0001] The invention belongs to the field of computer external device input, and relates to an electromagnetic induction device capable of handwriting input, in particular to an electromagnetic induction device capable of multi-point touch input. Background technique [0002] At present, electromagnetic touch technology is favored by the market due to its high positioning accuracy, the ability to obtain pen tilt angle and pressure information, and not affect the quality of screen display when used in the display field. It is widely used in handwriting computers, drawing tablets, and writing tablets. , mobile phones, e-books and other devices. The electromagnetic induction device applying the electromagnetic touch technology is composed of an electromagnetic induction board and an electromagnetic pen. The electromagnetic wave transmitter and receiver are arranged in the electromagnetic induction board, and a resonant circuit is arranged in the electromagnetic ...

AI Technical Summary

Problems solved by technology

[0003] However, the electromagnetic induction device can only realize the single-point touch function. The so-called single-point touch means that the electromagnetic induction plate of the electromagnetic induction device emits electromagnetic waves of a single frequency, and can only detect electromagnetic pens that generate the same resonance frequency. The electromagnetic pen works in the effective area of ​​the electromagnetic induction board, and the electromagnetic pens of other frequencies cannot work, and the function is single

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