Lavalier microphone assembly protected against friction noises

TLDR: In this article, a microphone assembly includes a longitudinally elongated microphone capsule which is supported within a substantially cylindrical outer casing having an electrical wire connection entering the casing from one end.

Abstract: A microphone assembly includes a longitudinally elongated microphone capsule which is supported within a substantially cylindrical outer casing having an electrical wire connection entering the casing from one end. The microphone is provided with an acoustic inlet at the opposite end of the casing and it is supported in the casing at least at each end by a vibration absorbing support. The support isolates the microphone capsule from noise transmitted to the outer casing. The support at the acoustic inlet end of the microphone capsule comprises a resilient vibration absorbing annular molding which has an inward and radially extending inner end which bears against a collar of a cap which is fitted over the acoustic ends of the microphone. The outer periphery of the annular molding engages against the inner wall of the casing and is held in place by friction or by an adhesive. The cap includes an annular surface which is arranged over the end of the microphone capsule and it includes a collar forming a ''''Helmholtz resonator'''' together with an air chamber defined between the protective cap and the diaphragm of the microphone capsule. The molding holding the cap in position forms a funnel which opens outwardly and is engaged by a perforated cap and its associated ring nut at its outer end.