Alps Alpine Co., Ltd.

Minoru Watanabe

Satoshi Nakajima

Shinichi Endo

Harry Haryadi

Yasuhiro Suzuki

Satoshi Hayasaka

Yohei Rokkasho

An electrostatic input apparatus is provided. A measuring unit measures capacitance at a plurality of coordinates of an electrostatic coordinate input unit. A converting unit obtains a reference value of the capacitance and converts the capacitance to difference values according to a distance between the electrostatic coordinate input unit at the coordinates and a finger. A first coordinate calculating unit calculates barycentric coordinates of a contact portion from the difference values for the plurality of coordinates. A cycle determining unit 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. An operation determining unit 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.

Electrostatic input apparatus and input determination method

An electrostatic coordinate input device includes a finger detection unit that detects a proximity position of a finger of an operator on an operation surface by a capacitive sensing method; and a correction unit that, in a case where two proximity positions corresponding to two fingers are detected by the finger detection unit, corrects the two proximity positions so as to increase a distance between the two proximity positions.

Electrostatic coordinate input device and electrostatic coordinate calculation method

A coordinate input device includes a plurality of detection electrodes arranged in a grid shape, a coordinate calculation unit that calculates coordinates representing a proximity position of an object on a basis of changes in capacitances of the plurality of detection electrodes, and an output unit that outputs the coordinates calculated by the coordinate calculation unit. The coordinate calculation unit calculates the coordinates using each of a first calculation method and a second calculation method. In a case where two objects are detected using both the first calculation method and the second calculation method, the output unit outputs the coordinates calculated using the first calculation method in a case where a distance between the two objects is greater than a predetermined first threshold, and outputs the coordinates calculated using the second calculation method in a case where the distance between the two objects is less than a predetermined second threshold.

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Miyagi-ken, Japan

Minoru Watanabe