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Coordinate input apparatus, control method therefor, and computer-readable medium

  • US 9,335,865 B2
  • Filed: 08/22/2013
  • Issued: 05/10/2016
  • Est. Priority Date: 08/31/2012
  • Status: Active Grant
First Claim
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1. A coordinate input apparatus comprising:

  • first, second, third and fourth sensor units disposed corresponding to four corners of a coordinate input region and each comprising a light projecting unit configured to project light toward the coordinate input region, and a light receiving unit configured to receive incoming light, and the first and second sensor units are set to a first retroreflecting unit, the third and fourth sensor units are set to a second retroreflecting unit, and the first and second retroreflecting units are disposed corresponding to two sides of the coordinate input region;

    a determination unit configured to detect first angle information between a direction corresponding to the third sensor unit detected by the first sensor unit and a direction from the second sensor unit to the first sensor unit disposed corresponding to a first corner of the coordinate input region, to detect at least three pieces of angle information in second angle information between the direction corresponding to the third sensor unit detected by the first sensor unit and a direction corresponding to the fourth sensor unit detected by the first sensor unit disposed corresponding to the first corner of the coordinate input region, third angle information between a direction corresponding to the third sensor unit detected by the second sensor unit and a direction corresponding to the fourth sensor unit detected by the second sensor unit, fourth angle information between a direction corresponding to the first sensor unit detected by the third sensor unit and a direction corresponding to the second sensor unit detected by the third sensor unit disposed corresponding to a third corner of the coordinate input region, and fifth angle information between a direction corresponding to the first sensor unit detected by the fourth sensor unit and a direction corresponding to the second sensor unit detected by the fourth sensor unit disposed corresponding to a fourth corner of the coordinate input region, by directly receiving light from the light projecting unit of one sensor unit at the light receiving unit of the other sensor unit, and to determine a positional relationship among the first, second, third and fourth sensor units in accordance with the first angle information and the at least three pieces of angle information in the second, third, fourth and fifth angle information; and

    a coordinate calculation unit configured to calculate coordinate values of a designated position based on the position relationship determined by the determination unit.

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