Onkyo Corporation

Takeru Inoue

Sadatoshi Hisamoto

Mamoru Sekiya

Yushi Ono

Hiroyasu Kumo

Hajime Yoshimura

There is provided a diaphragm or a dust cap configured to emit a sound wave and an electrodynamic speaker unit including the diaphragm or the dust cap. The speaker unit is configured so that a great peak dip of sound pressure frequency characteristics due to influence of a divided vibration mode can be prevented and excellent reproduced sound quality can be provided. In the diaphragm or the dust cap, a recessed-raised portion imitating a wing of an insect is formed at least on one surface of a diaphragm portion configured to emit a sound wave. Preferably, the recessed-raised portion is formed based on data obtained by measurement of an actual shape of a wing vein of the insect or data of a Voronoi diagram imitating the wing vein of the insect.

Diaphragm or dust cap and speaker unit

The loudspeaker includes a dome diaphragm that is made of a base material impregnated in a thermosetting resin; a cone diaphragm whose outer circumference side end portion is coupled with an outer circumference end portion of the dome diaphragm; and a voice coil having a bobbin whose one end is coupled to a back surface of the dome diaphragm, and whose outer curved surface is coupled with an inner circumference end portion of the cone diaphragm, wherein the dome diaphragm is provided with a plurality of cone-shaped projections that is formed by hardening the thermosetting resin, projecting from the back surface, and disposed in a circular pattern with a space between each other, the plurality of cone-shaped projections defining a coupling portion to which the one end of the bobbin is coupled.

Loudspeaker

A speaker diaphragmincludes a first diaphragm portion, a second diaphragm portionintegrally molded with the first diaphragm portion, and a bobbin-receiving portionprotruding from a back side of a connecting portion between the first diaphragm portionand the second diaphragm portion, with one end of a voice coil bobbinbeing bonded to the bobbin-receiving portion. The bobbin-receiving portionincludes a first extensionextending backwards from the first diaphragm portionand a second extensionextending backwards from the second diaphragm portion. A bobbin-receiving grooveis defined between the first extensionand the second extension. The voice coil bobbinis inserted in and bonded to the bobbin-receiving groove

Growing community of inventors

Neyagawa, Japan

Takeru Inoue