Patent ID: 7515728
Filing Date: 2009-04-07
Classification: H04R

Abstract:
1. A speaker apparatus comprising: a first diaphragm; a second diaphragm arranged coaxial with the first diaphragm along a driving direction; a frame having diaphragm supporting portions; and a voice-coil bobbin, wherein outer circumferential portions of the first diaphragm and the second diaphragm are fixed to the diaphragm supporting portions respectively, the second diaphragm has an inner edge and an outer edge and has a curved shape, wherein a distance from the inner edge to an apex of the curve is substantially the same distance as a distance from the outer edge to the apex of the curve; an inner circumferential portion of the first diaphragm is connected to the second diaphragm at a contact portion substantially at the apex of the curve, and the inner edge of the second diaphragm is fixed directly to the voice-coil bobbin so as to make a sealed space between the first diaphragm, the second diaphragm and the frame, and the voice-coil bobbin is supported by springiness of a gas contained in the sealed space.