Patent ID: 9594442
Date: 2017-03-14
CPC Classifications: G06F

Claim:
1. A handwriting input device comprising: a touch panel which can detect a touch given through a sheet of paper put on the touch panel; and a control section, which obtains position information of touch points on the touch panel at first time intervals, determines a location of a sheet of paper on the touch panel to obtain position information of a specific part of the sheet as sheet location information, at second time intervals, and outputs the position information of the touch points and the sheet location information so as to be associated with each other, wherein the second time interval is longer than the first time interval, and the control section, on finding no sheet location information which corresponds to the position information of one of the touch points, calculates corresponding sheet location information which corresponds to the position information of the one of the touch points, on a basis of the sheet location information about a predetermined number of locations of the sheet obtained immediately before obtaining the position information of the one of the touch points, and calculates a displacement amount of the sheet corresponding to the position information of the one of the touch points, by using the calculated corresponding sheet location information.