Electronic handwriting pen with function of detecting pressure value

Abstract

The invention relates to a pressure-sensitive handwriting pen, which comprises a continuous quantity pressure sensor arranged in a pen point and a front-end adapter circuit, a signal conditioning circuit and an output unit for outputting wired or wireless signals which are matched with the pressure sensor, wherein the continuous quantity pressure sensor has a unique mapping relationship between an output value and pressure. The pressure-sensitive handwriting pen can use a resister strain foil, a Hall element, an electret capacitor or an electret microphone, a variable capacitor and a variable inductor as a pressure sensor element, and aiming at handwriting light pens and handwriting ultraphonic pens, provides an implementation scheme that by utilizing the conventional infrared transmission unit on a handwriting pen, handwriting pressure data and the original signal system are integrated to transmit pressure data. By applying the pressure-sensitive handwriting pen, on one hand, the change of calligraphy is more abundant and is closer to natural writing, and on the other hand, the application of handwritten input products on aspects of calligraphy, painting and the like and particularly the pressure-sensitive handwriting on display screens is expanded. Various sensors used by the pressure-sensitive handwriting pen have the advantages of low cost and simple adapter circuit, and thus the pressure-sensitive handwriting pen is suitable to be popularized and used.

Description

technical field [0001] The invention relates to an electronic stylus for an electronic whiteboard or a handwriting board, which belongs to the technical field of computer human-computer interaction equipment, in particular to the technical field of handwriting input hardware for inputting characters and graphics on a computer in a handwriting manner. Background technique [0002] Computer handwriting boards and interactive electronic whiteboards used for online communication, text and graphic input, teaching, and conference systems have been more and more widely used. Existing technologies for such products mainly include resistive film, electromagnetic induction, capacitance, surface acoustic wave, ultrasonic, infrared, image processing and other technologies. Although these technologies can realize the input of handwritten graphics and texts, in some occasions that need to express some writing characteristics of the writer, such as changing the thickness of the strokes thr...

AI Technical Summary

Problems solved by technology

However, the main function of the pressure sensor here is to judge the writing state of the pen, not the strength of the pen when writing, so it cannot solve the problem of obtaining the pressure value.

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