Electromagnetic handwriting board, electromagnetic handwriting device and electronic equipment

Abstract

The invention provides an electromagnetic handwriting board, an electromagnetic handwriting device and electronic equipment, which belong to the field of electromagnetic handwriting. The electromagnetic handwriting device comprises the electromagnetic handwriting board and an electromagnetic pen, wherein the electromagnetic handwriting board comprises an antenna board and a signal processing module; the antenna board comprises a plurality of transmitting coils for transmitting excitation signals to the outside and a plurality of receiving coils for receiving induction signals which are generated by the electromagnetic pen under the excitation of the excitation signals and transmitting the induction signals to the signal processing module for processing; and the turns of at least one transmitting coil positioned at the periphery of the antenna board is more than the turns of the transmitting coils positioned in the central part of the antenna board. In the invention, the turns of the transmitting coils at the periphery are improved, and the induction energy at the periphery is improved, so that the induction distance at the periphery is increased, and the noise interference at the periphery is reduced; and the electromagnetic handwriting board, the electromagnetic handwriting device and the electronic equipment can be widely applied in the field of electromagnetic handwriting.

Description

technical field [0001] The invention belongs to the field of electromagnetic handwriting, and in particular relates to an electromagnetic handwriting board, an electromagnetic handwriting device and electronic equipment. Background technique [0002] Electromagnetic tablet is an input device that can be directly written or drawn by an electromagnetic pen. It has handwriting function, high positioning accuracy, can detect the pressure of the electromagnetic pen when it is used, and has sufficient sensing distance, so it is favored by the market. It is widely used in electronic devices such as electronic readers (that is, so-called "e-books"), tablet PCs, and mobile phones. [0003] With the development of computer technology, there are electromagnetic handwriting tablets combined with liquid crystal screens at present, so that users can directly write or draw on such liquid crystal screens, and no longer need an external electromagnetic handwriting tablet. Moreover, the tech...

AI Technical Summary

Problems solved by technology

This will result in that when the electromagnetic pen is at the same distance from the antenna board, it cannot be detected when the electromagnetic pen is located near the periphery of the antenna board, which will easily cause misoperation and false triggering, and bring troubles to users

[0009] The wiring design with equal turns and equal spacing of the traditional antenna board coils not only leads to the weakening of the peripheral energy, but also leads to the weakening of the energy at the four corners of the antenna board, which makes the four corners of the antenna board have low energy and are extremely susceptible to noise interference

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