| 摘要 |
An apparatus is controlled to detect a location of an object (O1) on a touch surface of a panel (1). An input scanner arrangement (BS1-BS2, 12A-12B) introduces at least two beams (B1, B2) of radiation into the panel (1) for propagation by internal reflection, and sweeps the beams (B1, B2) inside the panel across a sensing area. An output scanner arrangement (10A-10B, SD1-SD2) is synchronized with the input scanner arrangement so as to receive the beams (B1, B2) from the input scanner arrangement while they are swept across the sensing area and to direct the beams (B1, B2) onto at least one radiation detector. Thereby, each beam (B1, B2) is introduced and received on opposite ends of the sensing area. A data processor is connected to the radiation detector and operated to identify the location based on an attenuation of the beams (B1, B2) caused by the object (O1) touching the touch surface within the sensing area. |
