Patent ID: 7266213
Filing Date: 2007-09-04
Classification: H04R

Abstract:
1. A speaker comprising: a case having a cylindrical peripheral projection, the projection having a uniform continuous outside wall and a top flat surface and an inside wall downwardly extending from an inside edge of the top flat surface to form an inside cylindrical acoustic space; a magnetic device having a yoke embedded in the case, and a permanent magnet secured to the yoke; a diaphragm having a peripheral portion, and disposed on the top flat surface of the cylindrical peripheral projection of the case at the peripheral portion thereof; a voice coil secured to an underside of the diaphragm; a hold ring mounted on the periphery of the diaphragm on the top flat surface of the case for securing the diaphragm to the case; a protector having an upper plate and a cylindrical holding portion downwardly extending from a periphery of the upper plate, and having a continuous inside surface at the cylindrical holding portion; the protector being disposed to press the hold ring to the diaphragm, and the continuous inside surface of the cylindrical holding portion of the protector being secured to the uniform continuous outside wall of the case.