DATA INPUT DEVICE WITH A PRESSURE-SENSITIVE INPUT SURFACE

摘要

The data input device is provided with an input surface (40) which, by means of a pen, a writing instrument or the like, is locally subjected to a pressure or a pressing force. Below the input surface, there is arranged a sensor means for detecting at least the current position of the pen or writing instrument and for outputting output signals representing said position. Between the input surface and the sensor means, a color-change layer (50) is provided for temporary optical display of the position on the input surface (40) run over by the pen, writing instrument (30) or the like. The color-change layer (50) is responsive to the writing pressure exerted by the pen, writing instrument (30) or the like, and changes its color in those regions of the input surface which are run over by the pen, writing instrument (30) or the like. After lapse of a predetermined length of time after the input surface has been touched by the pen, writing instrument (30) or the like, the color-change layer (50) resumes its condition prevailing prior to said touch.