POSITION INPUT DEVICE, POSITION INPUT METHOD, AND POSITION INPUT PROGRAM

摘要

When using an optical waveguide enabling a multi-point simultaneous input, it is possible to accurately detect input positions of respective contact points even when a plurality of contact points are present at the same coordinate position. A control unit (5e) as control means identifies a position of an input to a touch area (2a) by a fingertip (10) as a contact object according to a coordinate where scattered light is received by light reception element (4) as light reception means and a coordinate of a light emission element (3) as alight emission means which has caused light ON scan upon light reception by the light reception element (4). Furthermore, when a plurality of contact points made by a fingertip (10) are present on one coordinate and/or the same coordinate of other coordinate and if another contact point is present between any one of the contact points and the light emission element (3) or the light reception element (4), the control means performs control to lower a threshold value for receiving the scattered light by the light reception element (4) corresponding to any one of the contact points.