DETECTION SYSTEM AND MUSICAL INSTRUMENT

WIPO Patent Application WO/2023/228745

A1

In the present invention, a first detection coil is provided to a first key, and a second detection coil is provided to a second key. A first signal generation unit includes a first drive coil that is opposite from the first detection coil, and generates a first detection signal in accordance with the distance between the first detection coil and the first drive coil. A second signal generation unit includes a second drive coil that is opposite from the second detection coil, and generates a second detection signal in accordance with the distance between the second detection coil and the second drive coil. The first drive coil includes a first drive part in which current flows in a first direction, and a second drive part in which current flows in a second direction that is opposite to the first direction. The second drive coil includes a third drive part in which current flows in the first direction, and a fourth drive part in which current flows in the first direction. The first detection coil includes a first portion and a second portion in which induced currents in opposite directions to each other are generated via electromagnetic induction by the first drive coil. The second detection coil includes a third portion and a fourth portion in which induced currents in the same direction as each other are generated via electromagnetic induction by the second drive coil.

IGARASHI KAZUYUKI (JP)
KOMATSU AKIHIKO (JP)

PCT/JP2023/017583

November 30, 2023

May 10, 2023

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YAMAHA CORP (JP)

G10H1/34

JP2022060655A	2022-04-15
JP2021081728A	2021-05-27
JP2021179533A	2021-11-18
JP2021508399A	2021-03-04
JP2021533490A	2021-12-02
US4580478A	1986-04-08

OHCHI INTERNATIONAL IP (JP)

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