Electromagnetic handwriting device, electromagnetic handwriting method and electronic device

An electromagnetic handwriting and equipment technology, which is applied in the input/output process of electrical digital data processing, instruments, and data processing, etc., can solve the problems of electromagnetic signal saturation, writing difficulties, no data output from electromagnetic stylus, and avoid excessive signal. Saturated, high-sensing height effects

Active Publication Date: 2016-12-21
HANVON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since the induction height of the electromagnetic tablet is directly proportional to the magnification of the amplifier circuit, if the induction height is to be increased, the magnification of the amplifier circuit needs to be increased. When the magnification of the amplifier circuit is too large, it will cause When the electromagnetic stylus is close to the electromagnetic tablet, the electromagnetic signal is over-saturated, which leads to no data output from the electromagnetic stylus, which makes it difficult for normal writing

Method used

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  • Electromagnetic handwriting device, electromagnetic handwriting method and electronic device
  • Electromagnetic handwriting device, electromagnetic handwriting method and electronic device
  • Electromagnetic handwriting device, electromagnetic handwriting method and electronic device

Examples

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Embodiment 1

[0030] see figure 1 , an electromagnetic handwriting method provided by an embodiment of the present invention, the method comprising:

[0031] S101. The control device of the electromagnetic tablet receives the first induction signal amplified by the first amplification unit and the second amplification unit from the electromagnetic stylus.

[0032] Exemplarily, the electromagnetic stylus is a pen-like input device that includes capacitors and inductors to form a resonant circuit inside. The user can control the cursor through the electromagnetic induction of the electromagnetic stylus on the electromagnetic tablet, so that the user can use the electromagnetic tablet. Writing or drawing etc. Since there are multiple groups of coils distributed in the electromagnetic writing board, these coils will generate a magnetic field above the electromagnetic writing board in the energized state. Therefore, the electromagnetic writing pen generates the first induction signal through th...

Embodiment 2

[0048] see figure 2 , an electromagnetic handwriting method provided in an embodiment of the present invention, comprising:

[0049] S201. The control device of the electromagnetic tablet receives the first induction signal amplified by the first amplification unit and the second amplification unit from the electromagnetic stylus.

[0050] The first induction signal generated by the electromagnetic stylus is amplified by the first amplifying circuit, then amplified by the second amplifying circuit, and transmitted to the control device of the electromagnetic stylus.

[0051] Wherein, the first amplifying unit is an amplifying circuit with adjustable gain;

[0052] The second amplifying unit is also an amplifying circuit with adjustable gain.

[0053] S202. The control device of the electromagnetic tablet obtains the gain of the second amplifying unit.

[0054] The control device of the electromagnetic tablet obtains the gain value of the second amplifying unit for the firs...

Embodiment 3

[0071] see image 3 , an electromagnetic handwriting circuit provided for an embodiment of the present invention, comprising a first amplifying unit 1, a second amplifying unit 2 connected to the output terminal 101 of the first amplifying unit 1, and an output The control device 3 connected to terminal 201, wherein,

[0072] The first amplifying unit 1 includes a first operational amplifier 10, an adjustment unit 11 connected to the negative input terminal 100 and the output terminal 101 of the first operational amplifier 10, and the adjustment unit 11 is used to adjust the first a gain of operational amplifier 10;

[0073]The second amplifying unit 2 includes a second operational amplifier 20 and at least two resistors 21 and 22 for setting the gain.

[0074] It should be noted that the number of resistors included in the second amplifying unit 2 can be two or more, since the number of resistors varies according to actual design and debugging, as long as the second amplify...

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Abstract

The embodiment of the invention discloses an electromagnetic handwriting device, an electromagnetic handwriting method and an electronic device and relates to the technical field of electromagnetic handwriting. The electromagnetic handwriting device can reach a high induction level, the condition of signal super saturation is avoided, and therefore a user can normally write. The electromagnetic handwriting method comprises the steps that a first induction signal sent from an electromagnetic handwriting pen and amplified by a first amplification unit and a second amplification unit is received; gain of the second amplification unit is obtained; if the intensity of the first induction signal is smaller than a first preset value or larger than a second preset value, according to the gain of the second amplification unit, gain of the first amplification unit is adjusted to first gain, so that the first induction signal sent from the electromagnetic handwriting pen is amplified through the first gain by the first amplification unit.

Description

technical field [0001] The invention relates to the technical field of electromagnetic handwriting, in particular to an electromagnetic handwriting device, an electromagnetic handwriting method and electronic equipment. Background technique [0002] At present, the mainstream electromagnetic handwriting device is mainly composed of two parts: an electromagnetic stylus and an electromagnetic tablet. Usually, the electromagnetic handwriting method used by this electromagnetic handwriting device is to generate an electromagnetic stylus through an excitation signal that induces the magnetic field of the electromagnetic tablet. The electromagnetic induction signal is input into the CPU (Central Processing Unit, central processing unit) after passing through the amplification circuit, the signal processing circuit, the integration circuit and the analog-to-digital conversion circuit, and the position and pressure information of the electromagnetic stylus are obtained by the CPU for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/046G06F3/0354
Inventor 李擎孙影向国威
Owner HANVON CORP
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