Patent ID: 7827671
Filing Date: 2010-11-09
Classification: H04R,Y10T

Abstract:
1. A method for creating balanced inner and/or outer air gaps during the manufacture of electromagnetic transducers of variable reluctance type, said method comprising the following steps—fixing the transducer's seismic mass side and load side to each other by temporarily fitting inner and/or outer air gaps there between with shims to provide balanced inner and/or outer air gaps in an axial direction between arms on a bobbin's core and an inner and outer yoke; and—attaching the seismic mass side to the load side through a spring suspension, said spring suspension having compliant properties working in the axial direction, and being in its resting state while arranged between the seismic mass side and the load side in order to maintain the inner and/or outer air gaps balanced; and finally—the shims are removed from the balanced inner and/or outer air gaps.