Coordinate input apparatus, its control method, and program
First Claim
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1. A coordinate input apparatus for detecting a pointed position on a coordinate input region, comprising:
- at least two sensor means arranged on corner portions of the coordinate input region wherein each of said at least two sensor means comprises first light-projecting means, second light-projecting means, first light-receiving means and second light-receiving means;
reflection means, arranged on a surrounding portion of the coordinate input region, for retroreflecting light projected by said sensor means;
angle calculation means for calculating angle information corresponding to the pointed position on the coordinate input region on the basis of a change in light amount distribution obtained from said at least two sensor means which receive light retroreflected from said reflection means; and
calculation means for calculating coordinates of the pointed position on the basis of the angle information calculated by said angle calculation means.
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Abstract
Angle information corresponding to a specified point is calculated on the basis of a change in light amount distribution obtained from at least two sensor units which are arranged on the corner portions of a coordinate input region and receive incoming light. The coordinates of a pointed position on the coordinate input region are calculated on the basis of the calculated angle information. Each of the at least two sensor units includes two light-receiving units being first and second light-receiving units.
26 Citations
12 Claims
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1. A coordinate input apparatus for detecting a pointed position on a coordinate input region, comprising:
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at least two sensor means arranged on corner portions of the coordinate input region wherein each of said at least two sensor means comprises first light-projecting means, second light-projecting means, first light-receiving means and second light-receiving means; reflection means, arranged on a surrounding portion of the coordinate input region, for retroreflecting light projected by said sensor means; angle calculation means for calculating angle information corresponding to the pointed position on the coordinate input region on the basis of a change in light amount distribution obtained from said at least two sensor means which receive light retroreflected from said reflection means; and calculation means for calculating coordinates of the pointed position on the basis of the angle information calculated by said angle calculation means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a coordinate input apparatus which comprises at least two sensor units which are arranged on corner portions of a coordinate input region, wherein each of said at least two sensor means comprises first light-projecting means, second light-projecting means, first light-receiving means and second light-receiving means, reflection means, arranged on a surrounding portion of the coordinate input region, for retroreflecting light projected by said sensor means, and detects a pointed position on the coordinate input region, comprising:
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an angle calculation step of calculating angle information corresponding to the pointed position on the coordinate input region on the basis of a change in light amount distribution obtained from the at least two sensor units which receives light retroreflected by said reflection means; and a calculation step of calculating coordinates of the pointed position on the basis of the angle information calculated in the angle calculation step.
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Specification