Double-magnetic-core handwriting digital pen

Abstract

The invention provides a double-magnetic-core handwriting digital pen. The pen comprises a refill, a position detection unit and a circuit unit which are arranged in sequence, wherein the circuit unitcomprises a power supply circuit, a CPU control circuit electrically connected with the power supply circuit, and a key detection circuit, a pressure detection circuit and a pulse modulation circuitwhich are electrically connected with the CPU control circuit respectively. The pressure detection circuit comprises a pen pressure oscillator used for generating pressure and a frequency voltage conversion module connected with the pen pressure oscillator. Corresponding pressure information is obtained by detecting the number of oscillatory waves of the pen pressure oscillator within fixed time through the CPU control circuit, or pressure information is obtained by detecting and reading inductance change of the pen pressure oscillator through the frequency-voltage conversion module, and the pressure information is transmitted to the digital panel through the CPU control circuit. According to the double-magnetic-core handwriting digital pen, the pressure sensitivity of the digital pen is detected through the pen pressure oscillator and the frequency voltage conversion module, the cost is lower than that of a pressure sensor in the prior art, the production difficulty is low, and the production cost is reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of handwriting pens, in particular to a digital handwriting pen with double magnetic cores. 【Background technique】 [0002] For electromagnetic handwriting devices, functions such as pressure and keys are included on the digital stylus. In the prior art, the usual way to detect keys and pressure sensitivity is to change the oscillation parameters of the handwriting digital pen, so that the sensing frequency received by the tablet is changed to determine the size of the keys and pressure sensitivity. However, this will lead to high requirements for the frequency accuracy of the handwritten digital pen during production, high production difficulty, and factors such as the environment when customers use the handwritten digital pen cannot guarantee the stability of the oscillation frequency. In this way, there are uncertainties in the pressure value determined according to the frequency, the buttons, etc., th...

AI Technical Summary

Problems solved by technology

However, the cost of the pressure-sensitive sensor used in these two methods is high, accounting for more than 90% of the cost. Therefore, the present invention provides a dual magnetic core handwriting digital pen with lower cost.

Images