Patent ID: 7006651

Claim:
A speaker comprising: a casing; a diaphragm for sealing an interior of the casing; a voice coil provided projectingly on the diaphragm toward the interior of the casing; a first elastic plate for partitioning the interior of the casing into a front chamber and a rear chamber, the front chamber being located between a first side of the first elastic plate and the diaphragm and the rear chamber being on a second side of the first elastic plate; a magnetic circuit comprising a magnet and an engagement portion, the magnetic circuit being fixed to the first elastic plate and the engagement portion being at least partially situated within the voice coil; the first elastic plate having a through hole for communication between the front chamber and the rear chamber whereby sound produced by vibration of the first elastic plate is accompanied either by communication of air between the front chamber and the rear chamber via the through hole or by resonance of the air in the front chamber and the rear chamber; a first connecting member comprising an elastic material for connecting the engagement portion of the magnetic circuit with the diaphragm; a second elastic plate comprising an elastic material and situated to oppose the first elastic plate; an inertial member fixed on the second elastic plate, and a second connecting member comprising an elastic material for connecting the second elastic plate with the first elastic plate and wherein one surface of the second elastic plate is exposed to outside.