Touch sensitive tablet using force detection
First Claim
1. A touch sensitive tablet using force detection wherein magnitudes of component forces at three fulcra, of an external force applied to one point on a faceplate are detected so as to evaluate coordinates of the point to which the external force has been applied;
- comprising conversion means to convert the component forces at each fulcrum into electric signals, sensing means to sense that no force components are present at each fulcrum as an indication that no force is applied, memory means to store the output signals of said conversion means at each fulcrum as offset values at, at least, one point of time in the period in which no force is applied, control means to control writing of the output signals of said conversion means into said memory means upon receiving an output of said sensing means, subtraction means to subtract outputs of said memory means from the outputs of said conversion means at each fulcrum, and calculation means to execute calculations for evaluating the coordinates of the point to which the external force has been applied, the outputs of said subtraction means in accordance with the output of said sensing means.
1 Assignment
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Accused Products
Abstract
A tablet comprising conversion means to convert component forces at three fulcra of an external force applied to one point on a faceplate into electric signals, sensing means to sense that no external force is applied, memory means to store the output signals of the conversion means at the respective fulcra as offset values at, at least, one point of time in the period in which no external force is applied, control means to control so as to execute writing into the memory means upon receiving an output of the sensing means, subtraction means to subtract outputs of the memory means from the outputs of the conversion means at the respective fulcra, and calculation means to execute calculations for evaluating coordinates of the point to which the external force has been applied, from outputs of the subtraction means in accordance with the output of the sensing means.
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Citations
11 Claims
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1. A touch sensitive tablet using force detection wherein magnitudes of component forces at three fulcra, of an external force applied to one point on a faceplate are detected so as to evaluate coordinates of the point to which the external force has been applied;
- comprising conversion means to convert the component forces at each fulcrum into electric signals, sensing means to sense that no force components are present at each fulcrum as an indication that no force is applied, memory means to store the output signals of said conversion means at each fulcrum as offset values at, at least, one point of time in the period in which no force is applied, control means to control writing of the output signals of said conversion means into said memory means upon receiving an output of said sensing means, subtraction means to subtract outputs of said memory means from the outputs of said conversion means at each fulcrum, and calculation means to execute calculations for evaluating the coordinates of the point to which the external force has been applied, the outputs of said subtraction means in accordance with the output of said sensing means.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification