TOUCH-TYPE INPUTTING DEVICE AND METHOD FOR CONTROLLING THE SAME
First Claim
1. A touch-type inputting device comprising:
- a touch panel including a piezoelectric sheet having a piezoelectric property, and first and second electrodes on respective first and second opposed main surfaces of the piezoelectric sheet, at least one of the first and second electrodes being a split electrode having a plurality of electrode parts electrically insulated from each other, and a manipulation surface to be subjected to a pressing manipulation by an operator being extended along the first main surface of the piezoelectric sheet,the touch-type inputting device being adapted to, when the pressing manipulation has been performed on the manipulation surface of the touch panel, make a comparison among respective voltages generated in the plurality of electrode parts in the split electrode so as to calculate a pressing-manipulated position and a pressing force;
a memory adapted to preliminarily store voltages obtained through a process that sets a lattice-shaped matrix coordinate system for the manipulation surface of the touch panel, and through a process that measures the voltages generated in the plurality of electrode parts due to calibrating pressing manipulations with a predetermined load at respective lattice points in the lattice-shaped matrix coordinate system, as reference voltages regarding the respective lattice points;
a first circuit adapted to determine actually-measured voltages induced in the respective electrode parts due to the pressing manipulation by the operator on the manipulation surface of the touch panel;
a second circuit adapted to make a first comparison between the electrode part which exhibits the reference voltage having a maximum absolute value and the electrode part which exhibits the actually measured voltage having a maximum absolute value, and a second comparison between the signs thereof, regarding each of the lattice points, and further adapted to define the lattice point as a lattice point to be processed when there are coincidences between the electrode parts and between the signs;
a third circuit adapted to calculate a ratio of the actually measured voltage to the reference voltage for each of the electrode parts and for each of the lattice points to be processed;
a fourth circuit adapted to determine an average of the ratios for the respective electrode parts for each of the lattice points to be processed;
a fifth circuit adapted to determine a standard deviation among the ratios for each of the lattice points to be processed;
a sixth circuit adapted to rank the lattice points to be processed in an ascending order of the standard deviation thereof;
a seventh circuit adapted to select predetermined n lattice points at upper ranks out of the ranked lattice points to be processed;
an eighth circuit adapted to determine X and Y coordinates of a pressed position due to the pressing manipulation by the operator according to equations;
X=Σ
(Xk/Sk)/Σ
(1/Sk), and Y=Σ
(Yk/Sk)/Σ
(1/Sk), wherein the coordinates of the selected lattice points are Xk and Yk, the standard deviations are Sk, and k is a whole number; and
a ninth circuit adapted to determine the pressing force in the pressing manipulation by the operator by multiplying the load by the average of the ratios of the lattice point at the uppermost rank.
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Accused Products
Abstract
A piezoelectric sheet included in a touch panel is provided with a split electrode having a plurality of electrode parts. Lattice-shaped coordinates are set in the touch panel, and voltages generated in the respective electrode parts through pressing manipulations with a predetermined load on the respective lattice points are preliminarily stored in a storage portion as reference voltages. During actual use, actually-measured voltages induced in the respective electrode parts due to a pressing manipulation are detected by a detection portion. The ratios of the measured voltages to the reference voltages are calculated by an operation portion, and the average thereof and the standard deviation thereamong are determined. The coordinates of the pressed position are determined from the coordinates of four lattice points in the ascending order of standard deviations. The load is multiplied by the ratio to determine the pressing force of the lattice point having a minimum standard deviation.
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Citations
13 Claims
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1. A touch-type inputting device comprising:
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a touch panel including a piezoelectric sheet having a piezoelectric property, and first and second electrodes on respective first and second opposed main surfaces of the piezoelectric sheet, at least one of the first and second electrodes being a split electrode having a plurality of electrode parts electrically insulated from each other, and a manipulation surface to be subjected to a pressing manipulation by an operator being extended along the first main surface of the piezoelectric sheet, the touch-type inputting device being adapted to, when the pressing manipulation has been performed on the manipulation surface of the touch panel, make a comparison among respective voltages generated in the plurality of electrode parts in the split electrode so as to calculate a pressing-manipulated position and a pressing force; a memory adapted to preliminarily store voltages obtained through a process that sets a lattice-shaped matrix coordinate system for the manipulation surface of the touch panel, and through a process that measures the voltages generated in the plurality of electrode parts due to calibrating pressing manipulations with a predetermined load at respective lattice points in the lattice-shaped matrix coordinate system, as reference voltages regarding the respective lattice points; a first circuit adapted to determine actually-measured voltages induced in the respective electrode parts due to the pressing manipulation by the operator on the manipulation surface of the touch panel; a second circuit adapted to make a first comparison between the electrode part which exhibits the reference voltage having a maximum absolute value and the electrode part which exhibits the actually measured voltage having a maximum absolute value, and a second comparison between the signs thereof, regarding each of the lattice points, and further adapted to define the lattice point as a lattice point to be processed when there are coincidences between the electrode parts and between the signs; a third circuit adapted to calculate a ratio of the actually measured voltage to the reference voltage for each of the electrode parts and for each of the lattice points to be processed; a fourth circuit adapted to determine an average of the ratios for the respective electrode parts for each of the lattice points to be processed; a fifth circuit adapted to determine a standard deviation among the ratios for each of the lattice points to be processed; a sixth circuit adapted to rank the lattice points to be processed in an ascending order of the standard deviation thereof; a seventh circuit adapted to select predetermined n lattice points at upper ranks out of the ranked lattice points to be processed; an eighth circuit adapted to determine X and Y coordinates of a pressed position due to the pressing manipulation by the operator according to equations;
X=Σ
(Xk/Sk)/Σ
(1/Sk), and Y=Σ
(Yk/Sk)/Σ
(1/Sk), wherein the coordinates of the selected lattice points are Xk and Yk, the standard deviations are Sk, and k is a whole number; anda ninth circuit adapted to determine the pressing force in the pressing manipulation by the operator by multiplying the load by the average of the ratios of the lattice point at the uppermost rank. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a touch-type inputting device, the touch-type inputting device including a touch panel having a piezoelectric sheet with a piezoelectric property, and first and second electrodes on respective first and second opposed main surfaces of the piezoelectric sheet, at least one of the first and second electrodes being a split electrode having a plurality of electrode parts electrically insulated from each other, and a manipulation surface to be subjected to a pressing manipulation by an operator being extended along the first main surface of the piezoelectric sheet,
the touch-type inputting device being adapted to, when the pressing manipulation has been performed on the manipulation surface of the touch panel, make a comparison among respective voltages generated in the plurality of electrode parts in the split electrode so as to calculate a pressing-manipulated position and a pressing force, the method comprising: -
a first preparatory process that sets a lattice-shaped matrix coordinate system for the manipulation surface of the touch panel; a second preparatory process that measures voltages generated in the plurality of electrode parts due to calibrating pressing manipulations with a predetermined load at respective lattice points in the lattice-shaped matrix coordinate system; and a third preparatory process that preliminarily stores, in a memory, the voltages obtained through the second preparatory process as reference voltages regarding the respective lattice points; a first implementation process that determines actually-measured voltages induced in the respective electrode parts due to the pressing manipulation by the operator on the manipulation surface of the touch panel; a second implementation process that makes a comparison between the electrode part which exhibits the reference voltage having a maximum absolute value and the electrode part which exhibits the actually measured voltage having a maximum absolute value, and a comparison between the signs thereof, regarding each of the lattice points, and that defines the lattice point as a lattice point to be processed when there are coincidences between the electrode parts and between the signs; a third implementation process that calculates a ratio of the actually measured voltage to the reference voltage for each of the electrode parts and for each of the lattice points to be processed; a fourth implementation process that determines an average of the ratios for the respective electrode parts for each of the lattice points to be processed; a fifth implementation process that determines a standard deviation among the ratios for each of the lattice points to be processed; a sixth implementation process that ranks the lattice points to be processed in an ascending order of the standard deviations; a seventh implementation process that selects predetermined n lattice points at upper ranks out of the ranked lattice points to be processed; an eighth implementation process that determines X and Y coordinates of a pressed position due to the pressing manipulation by the operator according to equations;
X=Σ
(Xk/Sk)/Σ
(1/Sk), and Y=Σ
(Yk/Sk)/Σ
(1/Sk), wherein the coordinates of the selected lattice points are Xk and Yk, the standard deviations are Sk, and k is a whole number; anda ninth implementation process that determines the pressing force in the pressing manipulation by the operator by multiplying the load by the average of the ratios of the lattice point at the uppermost rank. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification