A touchscreen for detecting multiple touches

摘要

An infrared (IR) touchscreen system for detecting multiple touches comprises a touch area (156). At least one transmitter (152, 154) is positioned proximate to outer edges (157) of the touch area for transmitting first beams in a first direction. At least one beam splitter (162, 164) is positioned proximate to the outer edges of the touch area and is configured to split the first beams into at least second (170) and third (172) beams traveling through the touch area in at least second and third directions, respectively, the second and third directions being different from each other. Receivers (158, 160) positioned proximate to the outer edges of the touch are for receiving the at least second and third beams. At least one transmitter is an IR transmitter and receivers are IR receivers.