Touch panel device, depressing force calculation method, and storage medium storing depressing force calculation program

1. A touch panel device comprising:

a touch panel having an operation surface on which a touch operation is performed;

an elastic member that supports the touch panel;

a plurality of depressing force sensors arranged at installation positions outside the elastic member and outputting sensor signals corresponding to magnitude of depressing force and a position on the operation surface to which the depressing force is applied, wherein the installation positions are positions where depression of the touch panel occurs due to the application of the depressing force or where upward warps of the touch panel occur due to the application of the depressing force, depending on the magnitude of the depressing force and the position on the operation surface to which the depressing force is applied; and

processing circuitry

to obtain touch coordinates indicating a position of the touch operation;

to obtain a plurality of detection values corresponding to the sensor signals when the depressing force is applied to the operation surface; and

to load a plurality of predetermined depressing force calculation modes from a storage storing a plurality of regions on the operation surface and the plurality of predetermined depressing force calculation modes corresponding to the plurality of regions, to select a depressing force calculation mode for a region corresponding to the touch coordinates from the plurality of depressing force calculation modes, and to calculate the depressing force by using the selected depressing force calculation mode and the plurality of detection values.

2. The touch panel device according to claim 1 , wherein the processing circuitry previously generates the plurality of regions on the operation surface and the plurality of depressing force calculation modes corresponding to the plurality of regions and stores the generated regions and depressing force calculation modes in the storage.

3. The touch panel device according to claim 1 , wherein each of the plurality of depressing force calculation modes is a calculation formula for calculating the depressing force by weighted addition of the plurality of detection values.

4. A depressing force calculation method to be executed by a touch panel device that includes a touch panel having an operation surface on which a touch operation is performed, an elastic member that supports the touch panel, and a plurality of depressing force sensors arranged at installation positions outside the elastic member and outputting sensor signals corresponding to magnitude of depressing force and a position on the operation surface to which the depressing force is applied, wherein the installation positions are positions where depression of the touch panel occurs due to the application of the depressing force or where upward warps of the touch panel occur due to the application of the depressing force, depending on the magnitude of the depressing force and the position on the operation surface to which the depressing force is applied, the method comprising:

obtaining touch coordinates indicating a position of the touch operation;

obtaining a plurality of detection values corresponding to the sensor signals when the depressing force is applied to the operation surface; and

loading a plurality of predetermined depressing force calculation modes from a storage storing a plurality of regions on the operation surface and the plurality of predetermined depressing force calculation modes corresponding to the plurality of regions, selecting a depressing force calculation mode for a region corresponding to the touch coordinates from the plurality of depressing force calculation modes, and calculating the depressing force by using the selected depressing force calculation mode and the plurality of detection values.

5. A non-transitory computer-readable storage medium storing a depressing force calculation program to be executed by a control device of a touch panel device that includes a touch panel having an operation surface on which a touch operation is performed, an elastic member that supports the touch panel, and a plurality of depressing force sensors arranged at installation positions outside the elastic member and outputting sensor signals corresponding to magnitude of depressing force and a position on the operation surface to which the depressing force is applied, wherein the installation positions are positions where depression of the touch panel occurs due to the application of the depressing force or where upward warps of the touch panel occur due to the application of the depressing force, depending on the magnitude of the depressing force and the position on the operation surface to which the depressing force is applied,

the depressing force calculation program causing the control device to execute:

obtaining touch coordinates indicating a position of the touch operation;

obtaining a plurality of detection values corresponding to the sensor signals when depressing force is applied to the operation surface; and

loading a plurality of predetermined depressing force calculation modes from a storage storing a plurality of regions on the operation surface and the plurality of predetermined depressing force calculation modes corresponding to the plurality of regions, selecting a depressing force calculation mode for a region corresponding to the touch coordinates from the plurality of depressing force calculation modes, and calculating the depressing force by using the selected depressing force calculation mode and the plurality of detection values.