Pressure detection device

Abstract

The invention relates to a pressure detection device. The pressure detection device comprises: a housing which is of a hollow structure and forms an accommodation part; a pressure conduction part arranged at the front end of the accommodating part; a first magnetic pole arranged in the accommodating part, wherein one end of the first magnetic pole is contacted with the pressure conduction part, and the other end is contacted with an elastic body; the elastic body arranged between the first magnetic pole and a second magnetic pole; the second magnetic pole arranged in the accommodating part, wherein one end is contacted with the elastic body; a coil wound on the side wall of the second magnetic pole; and a processing circuit connected with the output end of the coil. The pressure conduction part retracts towards the interior of an opening under the action of pressure, so that the elastic body generates extrusion deformation, the first magnetic pole gets close to the direction of the second magnetic pole, and the inductance of the coil is changed; and the processing circuit determines a pressure value between the pressure conduction part and the writing medium according to the variable quantity of the inductance, and outputs a detection control signal.

Description

technical field [0001] The invention relates to the field of handwriting devices for operating touch screens, in particular to a pressure-sensitive detection device. Background technique [0002] In recent years, coordinate input devices have gradually become important input devices applied to electronic devices such as personal computers. The coordinate input device includes a pen-like position indicator and a position detection device with an input interface. In a coordinate input device, an input operation is a positioning operation, and a handwriting input operation or a hand-drawn input operation is realized by using a position indicator. Conventionally, as such a pen-shaped position indicator, a position indicator for an electromagnetic induction type position detection device is known. In this electromagnetic induction type position indicator, a resonant circuit is formed by connecting a resonant capacitor to a coil wound around a ferrite core. And the position ind...

AI Technical Summary

Problems solved by technology

However, in the case of small pressure, the existing pressure detection device cannot measure the pressure, so that the writing function of the nib cannot be realized, which is the so-called "non-recognition" phenomenon

Moreover, the existing pressure detection device may also show that there is pressure when there is no pressure input, which is the so-called "misidentification" phenomenon

The phenomenon of "non-recognition" and "misrecognition" existing in the existing pressure detection device brings great inconvenience to the user and affects the use effect of the equipment

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