Induction antenna, electromagnetic handwriting device and antenna plate thereof

Abstract

The invention provides an induction antenna, an electromagnetic handwriting device and an antenna plate thereof, wherein the induction antenna comprises a plurality of antenna coils arranged in parallel, wherein one ends of the antenna coils are input / output ends and the other ends are provided with loads, and the load of the antenna coil positioned at the outer side is less than that of the antenna coil positioned at the inner side. In addition, the antenna plate and the electromagnetic handwriting device are internally provided with the induction antennae. According to the invention, the induction antenna has uniform induction strength in the whole induction region, especially, the induction accuracy of the edge can be improved.

Description

technical field [0001] The invention belongs to the field of electrical digital processing, and relates to an induction antenna, an antenna plate of an electromagnetic handwriting device and the electromagnetic handwriting device. Background technique [0002] In the existing electromagnetic handwriting device, when the electromagnetic pen with resonant circuit moves on the antenna board, the electromagnetic wave sent from the transmitting coil of the antenna board excites the resonant circuit of the electromagnetic pen, so that the electromagnetic pen emits a strong electromagnetic pen signal. [0003] figure 1 A diagram of the existing antenna board configuration. Such as figure 1 As shown, on the antenna board, there are a plurality of transmitting coils T arranged in parallel and a plurality of receiving coils R arranged vertically to the transmitting coil T, by scanning the plurality of transmitting coils T and receiving coils R respectively, when the receiving coil R...

AI Technical Summary

Problems solved by technology

Because of its structure, the energy of the transmitting coil T1 near the outer transmitting coil T1 and TN is low, and it is easily affected by external interference, which has a bad influence on the recognition accuracy of the position of the electromagnetic pen.

On the other hand, the same problem exists for the receiving coil

Therefore, on the rectangular sensing area 200, the recognition accuracy of the position of the electromagnetic pen at the edge, especially at the corner, is poor.

[0004] In the prior art, in order to increase the energy near the outer transmitting coils T1 and TN, the distance between the outer transmitting coils T is reduced, but reducing the distance will also introduce unnecessary interference

If the edge routing density is increased by increasing the antenna board area or the number of layers, it will increase the design cost

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