Resistance film tablet system capable of rapidly detecting a position of contact and method of controlling the same
AssigneeNEC Corporation
InventorYoshikazu Ikegami
Life of this patent
Estimating the term…
Abstract
In a resistance film tablet system which includes a pair of resistance films superposed on each other and spaced by a predetermined distance therebetween, a value measured at the previous detection is stored in a memory beforehand and is read out for being converted into an analog voltage, then, a capacitance portion of the resistance films is charged with the voltage. The capacitance portion is converged to its convergent value faster, thereby a faster sampling can be operated. It is therefore possible to scan a resistance film tablet system faster by shortening a waiting time after a necessary mode setting, when measuring a voltage at a contact point in X-detection or Y-detection mode.
Claims11
A resistance film tablet system which includes a pair of resistance films superposed on each other and spaced by a predetermined distance therebetween, comprising:
- contact detection means for detecting that said a pair of resistance films are in contact with each other at a contact point;
- charging means for charging a capacitance between said a pair of resistance films in response to the detection;
- and
- detection means for detecting a position in a first direction and a position in a second direction orthogonal to said first direction regarding the contact point of said a pair of resistance films after the charging.
A method of controlling a resistance film tablet system composed of a pair of resistance films superposed on each other and spaced by a predetermined distance therebetween, comprising the steps of;
- detecting a contact state between said a pair of resistance films;
- charging a capacitance between said a pair of resistance films in response to the detection of said contact state;
- and
- detecting a position in a first direction and a position in a second direction orthogonal to said first direction regarding the contact point of said a pair of resistance films after the charging.
A recording medium for storing a computer program to achieve a method of controlling a resistance film tablet system composed of a pair of resistance films superposed on each other and spaced by a predetermined distance therebetween, wherein said computer program makes a computer detect a contact state between said a pair of resistance films, and charge a capacitance between said a pair of resistance films in response to the detection of a contact state, and detect a position in a first direction and a position in a second direction orthogonal to said first direction regarding the contact point of said a pair of resistance films after the charging.
Dependencies are inferred from the claim text.