Patent ID: 11972073
Assignee: ALPS ALPINE CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. An electrostatic input apparatus comprising:
a measuring unit that measures capacitance at a plurality of coordinates of an electrostatic coordinate input unit;
a converting unit that obtains a reference value of the capacitance and subtracts the reference value from the capacitance to convert the capacitance to difference values according to a distance between the electrostatic coordinate input unit at the plurality of coordinates and a finger;
a first coordinate calculating unit that calculates barycentric coordinates of a contact portion from the difference values for the plurality of coordinates;
a cycle determining unit that determines whether the difference values at coordinates on a circumference of a circle with a predetermined radius centered on the barycentric coordinates exhibit periodicity of two cycles in one round along the circle; and
an operation determining unit that performs, when the cycle determining unit determines that the difference values exhibit periodicity of two cycles, a determination that an input operation using two or more fingers has been performed.