Patent ID: 8890843
Filing Date: 2014-11-18
Classification: G06F

Abstract:
1. An apparatus for determining a location of at least one object on a touch surface, said apparatus comprising: a panel-defining the touch surface and an opposite surface; an illumination arrangement adapted to introduce radiation into the panel for propagation by internal reflection between the touch surface and the opposite surface, so as to generate a grid of intersecting radiation paths in a sensing area; a detection arrangement adapted to measure the transmitted energy in said radiation paths; and a data processor connected to the detection arrangement and configured to determine, based on the measured energy, said location based on an attenuation of two or more radiation paths caused by the object touching the touch surface within the sensing area; wherein said illumination arrangement is configured to generate at least a subset of the radiation paths by sweeping at least one beam of radiation along the touch surface, a propagation direction of the at least one beam of radiation within the panel being non-perpendicular to the sweeping direction of the at least one beam of radiation; wherein said detection arrangement comprises a fixed re-directing device configured to receive and re-direct said at least one beam onto a common detection point while said at least one beam is swept along the touch surface; and wherein said detection arrangement further comprises a radiation detector which is located at said common detection point to measure the energy of said at least one beam.