Coordinate detecting apparatus having acceleration detectors
First Claim
1. A coordinate input device for obtaining the spatial coordinates at the tip of a pen-type coordinate indicator, comprising:
- acceleration detecting means for detecting the acceleration of a body of the pen-type coordinate indicator;
attitude detecting means for detecting the attitude of the body of the pen-type coordinate indicator; and
coordinate operation means for determining the spatial coordinates at the tip of the coordinate indicator in accordance with outputs of the acceleration detecting means and the attitude detecting means.
1 Assignment
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Accused Products
Abstract
A coordinate input device includes a coordinate detector which may include an acceleration detector for accurate determination of the spatial coordinates of a coordinate indicator. A three-dimensional acceleration in a first coordinate system is detected by a first acceleration detecting unit and is converted into an input coordinate system in accordance with the attitude of the coordinate indicator. The effect of gravity is removed and the acceleration is integrated to obtain the spatial coordinates of the coordinate indicator. Even if the coordinate indicator is tilted, accurate coordinate input can be performed.
240 Citations
28 Claims
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1. A coordinate input device for obtaining the spatial coordinates at the tip of a pen-type coordinate indicator, comprising:
- acceleration detecting means for detecting the acceleration of a body of the pen-type coordinate indicator;
attitude detecting means for detecting the attitude of the body of the pen-type coordinate indicator; and
coordinate operation means for determining the spatial coordinates at the tip of the coordinate indicator in accordance with outputs of the acceleration detecting means and the attitude detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- acceleration detecting means for detecting the acceleration of a body of the pen-type coordinate indicator;
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9. A coordinate input device for inputting the spatial coordinates of a coordinate indicator using an acceleration detector, the coordinate input device comprising:
- a coordinate indicator for indicating an input coordinate;
acceleration detecting means fixed in the coordinate indicator for detecting an acceleration of the coordinate indicator;
first integrating means for integrating the acceleration output by the acceleration detecting means and for obtaining a velocity of the coordinate indicator;
second integrating means for integrating the velocity output by the first integrating means and for obtaining the position of the coordinate indicator; and
negative feedback means for performing a negative feedback function from the output of the second integrating means to the input of the first integrating means.
- a coordinate indicator for indicating an input coordinate;
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10. A coordinate input device for inputting the spatial coordinates of a coordinate indicator using an acceleration detector, the coordinate input device comprising:
- a coordinate indicator for indicating an input coordinate;
acceleration detecting means fixed in the coordinate indicator for detecting an acceleration of the coordinate indicator;
first integrating means for integrating the acceleration output by the acceleration detecting means and for obtaining a velocity of the coordinate indicator;
second integrating means for integrating the velocity output by the first integrating means and for obtaining the position of the coordinate indicator; and
at least one of a negative feedback means for performing a negative feedback function from the output of the first integrating means to the input of the first integrating means or a negative feedback means for performing a negative feedback function from the output of the second integrating means to the input of the second integrating means.
- a coordinate indicator for indicating an input coordinate;
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11. A coordinate input device for calculating the spatial coordinates at the tip of a pen-type coordinate indicator, the coordinate input device comprising:
- coordinate detecting means for determining the spatial coordinates of a pen-type coordinate indicator in a first coordinate system;
attitude detecting means for determining the attitude of a body of the coordinate indicator; and
first coordinate conversion means for determining the spatial coordinates at the tip of the coordinate indicator in a second coordinate system in accordance with the spatial coordinates of the coordinate indicator body in the first coordinate system and the attitude of the coordinate indicator body. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- coordinate detecting means for determining the spatial coordinates of a pen-type coordinate indicator in a first coordinate system;
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22. A method for calculating the spatial coordinates at the tip of a coordinate indicator, comprising the steps of:
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(a) detecting the acceleration at a detecting point of a coordinate indicator in at least two dimensions in a first coordinate system; (b) determining the attitude of the coordinate indicator; (c) transforming the acceleration of the detecting point in the first coordinate system to a second coordinate system which is a static coordinate system having a predetermined origin, the transformation being performed in accordance with the attitude of the coordinate indicator; (d) subtracting the acceleration due to gravity from the transformed detected acceleration value; (e) integrating the transformed detected acceleration to obtain the spatial coordinates of the detecting point; and (f) determining the spatial coordinates at the tip of the coordinate indicator in accordance with the spatial coordinates at the detecting point and the attitude of the coordinate indicator. - View Dependent Claims (23, 24, 25)
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26. A coordinate input device for obtaining the spatial coordinates of a pen-type coordinate indicator, comprising:
- acceleration detecting means for detecting the acceleration of a body of the pen-type coordinate indicator and producing an output;
attitude detecting means for detecting the attitude of the body of the pen-type coordinate indicator with respect to a tip thereof and producing an output; and
coordinate operation means for determining the spatial coordinates at the tip of the coordinate indicator in accordance with the outputs of the acceleration detecting means and the attitude detecting means such that movement of the body of the coordinate indicator alone is not erroneously detected as movement of the tip.
- acceleration detecting means for detecting the acceleration of a body of the pen-type coordinate indicator and producing an output;
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27. A coordinate input device for calculating the spatial coordinates at the tip of a pen-type coordinate indicator, the coordinate input device comprising:
- coordinate detecting means for determining the spatial coordinates of a pen-type coordinate indicator in a first coordinate system;
attitude detecting means for determining the attitude of a body of the coordinate indicator with respect to a tip thereof; and
first coordinate conversion means for determining the spatial coordinates at the tip of the coordinate indicator in a second coordinate system in accordance with the spatial coordinates of the coordinate indicator body in the first coordinate system and the attitude of the coordinate body such that movement of the body of the coordinate indicator alone is not erroneously detected as movement of the tip.
- coordinate detecting means for determining the spatial coordinates of a pen-type coordinate indicator in a first coordinate system;
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28. A coordinate input device for obtaining the spatial coordinates at the tip of a pen-type coordinate indicator, comprising:
- acceleration detecting means for detecting the acceleration of a body of the pen-type coordinate indicator and producing an output;
attitude detecting means for detecting the attitude of the body of the pen-type coordinate indicator and producing an output; and
coordinate operation means for determining the spatial coordinates at the tip of the coordinate indicator in accordance with the outputs of the acceleration detecting means and the attitude detecting means and predetermined data indicating the relationship between the positions of the acceleration detecting means and the tip of the coordinate indicator.
- acceleration detecting means for detecting the acceleration of a body of the pen-type coordinate indicator and producing an output;
Specification