Input device with adjustment structure and wireless pen thereof

Abstract

The invention relates to an input device with an adjustment structure, comprising a wireless pen with the adjustment structure, wherein the wireless pen with the adjustment structure is composed of a variable inductance, an adjustment part and a circuit; the variable inductance comprises a first iron core, a second iron core and a coil winding the first iron core and changes the inductance value with the interval change of the second iron core of the first iron core; the adjustment part comprises a telescopic piece and can change the interval of the second iron core of the first iron core with the telescopic contact force of a wireless pen core; and the circuit is connected with the variable inductance to form a resonant circuit to receive an electromagnetic wave signal emitted from a handwriting device, and the energy stored by the resonant circuit can emit an electromagnetic wave to the handwriting device based on the self oscillation frequency of the wireless pen after the resonance is over.

Description

technical field [0001] The invention relates to an input device and its wireless pen, in particular to an input device with an adjustment structure and its wireless pen. Background technique [0002] An electromagnetic handwriting input device, such as a digital tablet or an electromagnetic whiteboard, usually includes an electromagnetic wireless pen and a digital tablet device. The digital board generally includes an inductive antenna loop and a printed circuit board including an analog-to-digital converter, an amplifier, a processor, or a control IC for inductively processing the electromagnetic wave signal emitted by the electromagnetic pen. The electromagnetic pen generally uses a circuit composed of a capacitor and an inductance (LC), and uses the change of the contact force of the electromagnetic pen on the digital board to change the capacitance or inductance and the transmission frequency, so as to display the pressure of the pen tip of the electromagnetic pen on the...

AI Technical Summary

Problems solved by technology

However, the advantages of its design are just its disadvantages, because the material of the two poles of the variable capacitor (like a parallel electric plate) is metal or conductive rubber, when the parallel electric plate is close to the coil, it will It directly affects the distribution of the magnetic force lines, destroying the integrity of the closed magnetic force lines emitted by the coil like a metal shield, resulting in weakening of the signal, and affecting the distribution of the magnetic field strength, resulting in distortion of the angle of the pen tilt

At the same time, in order to make the variable capacitor sensitive to light application of pressure, it cannot withstand heavy force, which will cause the variable capacitor to malfunction when excessive force is applied to the refill.

To make matters worse, the variable capacitor structure, if there are unavoidable manufacturing tolerances in length or height, will lead to inaccurate oscillation frequency, and the design also lacks a remedial adjustment structure to make the frequency tuned back

[0006] In view of the shortcomings of the above-mentioned traditional wireless pen or electromagnetic pen, the present invention proposes an improved wireless pen with adjustable structure to solve the design defects of the traditional wireless pen

This shows that above-mentioned existing input device and wireless pen thereof obviously still have inconvenience and defect in structure and use, and need to be further improved urgently

In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and the general product has no suitable structure to solve the above-mentioned problems. This is obviously the relevant industry. Urgent problem

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