Coordinate input apparatus and control method and program thereof
First Claim
1. A coordinate input apparatus which calculates a pointed position on a coordinate input region, comprising:
- light-receiving means arranged in the coordinate input region;
reflection means, arranged at a peripheral portion of the coordinate input region, for reflecting incident light;
light-emitting means for illuminating the coordinate input region with light;
angle calculation means for calculating angle information on the basis of a light amount distribution obtained from said light-receiving means; and
calculation means for calculating coordinates of a pointed position of pointing means on the basis of, of a plurality of pieces of angle information calculated by said angle calculation means, angle information corresponding to direct reflected light from said pointing means, the direct reflected light being generated by said light-emitting means.
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Accused Products
Abstract
A coordinate input apparatus includes a light-receiving unit arranged in a coordinate input region, a reflection unit arranged at the peripheral portion of the coordinate input region to reflect incident light, and a light-emitting unit which illuminates the coordinate input region with light. Angle information corresponding to a point which crosses a predetermined level in a light amount distribution obtained from the light-receiving unit is calculated. The coordinates of the pointed position are calculated on the basis of, of a plurality of pieces of calculated angle information, angle information corresponding to direct reflected light from the pointing means, the direct reflected light being generated by the light-emitting unit.
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Citations
7 Claims
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1. A coordinate input apparatus which calculates a pointed position on a coordinate input region, comprising:
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light-receiving means arranged in the coordinate input region; reflection means, arranged at a peripheral portion of the coordinate input region, for reflecting incident light; light-emitting means for illuminating the coordinate input region with light; angle calculation means for calculating angle information on the basis of a light amount distribution obtained from said light-receiving means; and calculation means for calculating coordinates of a pointed position of pointing means on the basis of, of a plurality of pieces of angle information calculated by said angle calculation means, angle information corresponding to direct reflected light from said pointing means, the direct reflected light being generated by said light-emitting means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control method of a coordinate input apparatus which calculates a pointed position on a coordinate input region on the basis of a light amount distribution obtained by a light-receiving unit arranged in the coordinate input region from reflected light from a reflection unit which is arranged at a peripheral portion of the coordinate input region to reflect incident light, comprising:
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an angle calculation step of calculating angle information on the basis of the light amount distribution obtained from the light-receiving unit; and a calculation step of calculating coordinates of a pointed position of pointing means on the basis of, of a plurality of pieces of angle information calculated in the angle calculation step, angle information corresponding to direct reflected light from the pointing means, the direct reflected light being generated by a light-emitting unit.
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Specification