Patent ID: 9485584
Filing Date: 2016-11-01
CPC Classification: H04R

Claim Text:
1. An apparatus comprising: an outer magnet having an outer magnet height; an inner magnet having an inner magnet height, the inner magnet disposed coplanar with and within the outer magnet; an outer cap having an outer cap height that is greater than both the inner magnet height and the outer magnet height; an inner cap having an inner cap height that is greater than both the inner magnet height and the outer magnet height, the inner cap disposed relative to the outer cap with a magnet gap between the inner cap and the outer cap, wherein the inner magnet and the outer magnet produce a magnetic field within the magnet gap; and a driver having a diaphragm; and an electrically-conductive mobile member having a first length that is shorter than the inner cap height and the outer cap height, and the electrically-conductive mobile member is coupled with the diaphragm of the driver.