Coordinate input apparatus
First Claim
1. A coordinate input apparatus that calculates coordinates of a pointed position using four sensor units placed around a coordinate input region and constructed to emit light toward the coordinate input region and to receive light of the coordinate input region, the apparatus comprising:
- an input unit constructed to input signals according to the received light; and
a calculation unit constructed to calculate placement information of the four sensor units, using angle information of light received by the four sensor units,wherein the calculation unit is constructed to calculate the coordinates of the pointed position based on the placement information of the four sensor units and the light received by the four sensor units when the position in the coordinate input region is pointed.
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Accused Products
Abstract
Position information of a first sensor unit and a second sensor unit is calculated using angle information of peaks calculated from a light amount distribution having a plurality of peaks detected by light-receiving unit of the second sensor unit from light emitted by light-emitting unit of the first sensor unit. The coordinates of a pointed position are calculated based on the position information of the first sensor unit and the second sensor unit and a change in a received light amount distribution that occurs due to a pointing to a coordinate input region detected by the light-receiving units. Here, the light-emitting units of the respective multiple sensor units are arranged in known positions relative to the light-receiving units.
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Citations
20 Claims
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1. A coordinate input apparatus that calculates coordinates of a pointed position using four sensor units placed around a coordinate input region and constructed to emit light toward the coordinate input region and to receive light of the coordinate input region, the apparatus comprising:
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an input unit constructed to input signals according to the received light; and a calculation unit constructed to calculate placement information of the four sensor units, using angle information of light received by the four sensor units, wherein the calculation unit is constructed to calculate the coordinates of the pointed position based on the placement information of the four sensor units and the light received by the four sensor units when the position in the coordinate input region is pointed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A coordinate input apparatus that calculates coordinates of a pointed position, comprising:
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four sensor units placed around a coordinate input region and constructed to emit light toward the coordinate input region and to receive light of the coordinate input region; and a calculation unit constructed to calculate placement information of the four sensor units using angle information of light received by the four sensor units, wherein the calculation unit is constructed to calculate the coordinates of the pointed position based on the placement information of the four sensor units and the light received by the four sensor units when the position in the coordinate input region is pointed. - View Dependent Claims (13, 14, 15, 16)
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17. A method for calculating coordinates of a pointed position using four sensor units placed around a coordinate input region and constructed to emit light toward the coordinate input region and to receive light of the coordinate input region, the method comprising:
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calculating placement information of the four sensor units using angle information of light received by the four sensor units; and calculating the coordinates of the pointed position based on the placement information of the four sensor units and the light received by the four sensor units when the position in the coordinate input region is pointed. - View Dependent Claims (18, 19, 20)
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Specification