Patent ID: 11917388
Assignee: FOSTER ELECTRIC COMPANY, LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A speaker device comprising:
a speaker unit including a magnetic circuit and a diaphragm that is connected to the magnetic circuit and being capable of generating sound waves by electrically driving the magnetic circuit to vibrate the diaphragm; and
a Helmholtz resonator connected to the speaker unit,
wherein the diaphragm includes a first surface oriented to a sealed space and a second surface that is a back surface of the first surface and is oriented to the Helmholtz resonator;
wherein the Helmholtz resonator includes a chamber oriented to the second surface and a duct connected to the chamber and having an opening in addition to a joint with the chamber;
wherein the chamber has a capacity smaller than a capacity of the sealed space; and
wherein the magnetic circuit is connected to the second surface of the diaphragm and is located outside the chamber.