Yamaha Corporation

Takahiro Terada

Masao Noro

Yukio Wakui

Koji Yataka

Tsunenori Sano

An object of the present invention is to provide a magnetic circuit for an acoustic transducer, the magnetic circuit enabling peeling of the surface of a member formed by compression-molding a soft magnetic composite material to be suppressed. The present invention is a magnetic circuit for an acoustic transducer, the magnetic circuit including: a yoke; a magnet; and a top plate, wherein the yokeincludes a bottom surface portionand a pole pieceprovided perpendicular to the bottom surface portion, the magnetand the top plateare provided in that order on the bottom surface portion, a magnetic gapin which a voice coilis disposed is formed between the pole pieceand the top plate, at least one of the pole pieceand the top plateincludes: a composite material partin a position facing the magnetic gap; and a protective layercovering at least a surface of the composite material part, the composite material partis formed from a soft magnetic composite material, and the material of the protective layerdiffers from the soft magnetic composite material.

Magnetic circuit for acoustic transducer, and speaker unit

A golf club has within the grip a main device, a connector, a wireless module, an antenna, a light emitting element, and an optical fiber. The main device is a device that includes a sensor such as a motion sensor, a circuit such as a CPU, and a battery. The light emitting element is an indicating means that emits light in accordance with the state of a component mounted in the golf club. The light emitted by the light emitting element is guided to the grip end by the optical fiber and emitted to the outside of the grip via the grip end.

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Hamamatsu, Japan

Takahiro Terada