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Control of coordinate input apparatus based on light distribution and moving amounts of sensor units

  • US 9,377,897 B2
  • Filed: 07/23/2013
  • Issued: 06/28/2016
  • Est. Priority Date: 08/03/2012
  • Status: Active Grant
First Claim
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1. A coordinate input apparatus in which a first bar housing unit and a second bar housing unit each including a retroreflecting member and at least two sensor units, the sensor units each being movable in a horizontal direction with respect to a coordinate input region and each including a light projecting unit and a light receiving unit, are arranged on two facing sides of the coordinate input region to make the retroreflecting members face each other for detecting a pointed position in the coordinate input region, comprising:

  • a determination unit configured to determine, based on a light amount distribution received by the light receiving unit of each of the sensor units, whether the sensor units are at appropriate positions;

    a measurement unit configured to measure moving amounts of the sensor units in a horizontal direction with respect to the coordinate input region when said determination unit determines that the sensor units are at appropriate positions; and

    a calculation unit configured to calculate coordinates of the pointed position in the coordinate input region based on the light amount distribution received by the light receiving unit and the moving amounts in a horizontal direction with respect to the coordinate input region measured by said measurement unit.

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