Panasonic Intellectual Property Management Co., Ltd.

Masashi Nishida

Kazuki Honda

Ippei Kiyama

Junichi Ikeda

A loudspeaker device includes: a loudspeaker unit; a cabinet that includes an opening and covers the rear side of the loudspeaker unit; a bass reflex port in a tubular shape that communicates the interior with the exterior of the cabinet, and includes one end disposed in the opening of the cabinet and the other end disposed inside the cabinet; and a diffuser in the shape of a mountain that includes a side surface in a substantially tapered shape, a top facing the one end of the bass reflex port, and a base edge located on the side of the side surface opposite to the top in the inclination direction of the side surface. The side surface of the diffuser includes a plurality of grooves spaced apart in the circumferential direction of the diffuser and each extending helically in a direction from the top to the base edge.

Loudspeaker device

A speaker includes: a diaphragm having a dome shape; a tubular member having the diaphragm disposed inside, and having an inner diameter increasing toward a front; and a phase plug. The phase plug includes: a front surface, a rear surface facing a central portion on a front surface of the diaphragm at a constant interval in parallel, and a side surface connecting the front surface and the rear surface. A front surface of the phase plug is larger than a rear surface of the phase plug as viewed in a front-rear direction of a speaker. At least a part of a side surface of the phase plug has an inclined surface extending outward while extending forward, faces an inner circumferential surface of the tubular member and a front surface of the diaphragm, and directs a sound wave generated from the diaphragm toward an inner circumferential surface of the tubular member.

Growing community of inventors

Osaka, Japan

Masashi Nishida