A Pen-Grip Shaped Device for Estimating Writing Pressure and Altitude
Kyosuke Kondo, Tsutomu Terada, Masahiko Tsukamoto · 2019
A stylus, which is a pen-shaped instrument, is often used to input commands to touch-screen devices. Especially, the stylus is suitable for creation of digital illustrations and handwriting. Most styluses are capacitance-type, which are unable to detect writing pressure and altitude that are important in the expression of drawing and writing. Moreover, although digitizer styluses such as Apple pencil have a function for detecting writing pressure and altitude, it is limited by the dedicated touch panel due to the specifications. In this research, we propose a pen-grip shaped device for estimating writing pressure and altitude from the force of the fingertip. The proposed device consists of the pen-grip part and 3 axis force sensors embedded into the position that is related to the state of the stylus. In the estimations for writing pressure, the result showed that the proposed method enables accurate estimation in many cases, although it did not work well in the cases of a low or a drastically changed writing pressure. On the other hand, the result of the estimated altitude showed low accuracy.