| 摘要 |
A position detecting apparatus is described, which includes a rectangular or square frame, divergent type light sources disposed on each of four corners of the frame to each emit a light signal, a plurality of light signal receivers including four sets of side light signal receivers disposed along one of four sides, respectively, to each receive the light signal, and a processor coupled to each of the plurality of light signal receivers. When an object touches on and within the frame, for each of the respective light sources, a portion of the light signal receivers of one or two neighboring ones of the four sets of side light signal receivers is blocked and has an decrease in an intensity of the received light signal, and the processor determines a specific position of the object based on a position of the plurality of light signal receivers each having the received light signal with the decreased intensity.
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