Ribbon Support System for Electrodynamic Microphone

摘要

A ribbon microphone having a housing made of wood, a wood laminate, or another suitable composite material having a characteristic impedance and density and a ribbon transducer assembly with metal support chassis having a higher characteristic impedance and density. By engineering a body housing and the ribbon support chassis having a similar or equal total weight but differing greatly in density, a rapid attenuation of internal harmonics is achieved, particularly reducing the undesirable metallic resonance of the metal bodies of conventional microphones. The improved tonal quality is achieved, not by uncoupling the acoustic mass of the housing, but rather, by tightly coupling the wood housing to a slender chassis on rails that support the ribbon. Advantageously, this cooperative effect also acts to dampen unwanted rumble and external shock outputs, and in a preferred embodiment, magnetic pole pieces are eliminated by designing air gaps between the chassis and the magnets. The chassis is a conductor and electrically connects the ribbon to a transformer, eliminating the need for solder connections. Thus the ribbon support system of the invention achieves a synergy of function by eliminating unneeded parts, simplifying assembly, and improving the tonal quality of the microphone.

主权项

1. An improved ribbon microphone having tonal qualities derived from a wood housing, which comprises a wood housing configured with center cavity to enclosingly receive a conductive metallic chassis, said metal chassis having contralateral rails for acoustically coupling to said wood housing, said wood housing having acoustic windows for receiving a sound and guide slots for receiving said lateral rails, wherein said metallic chassis is configured to support (a) a ribbon-magnet transducer combination in a cradle between said lateral rails, wherein said transducer is defined by a conductive ribbon suspended in a magnetic field having parallel flux lines between two permanent magnets, wherein an electrical potential is generated by a sound-driven oscillation of said conductive ribbon, and (b) an electrical transformer mounted between said lateral rails, wherein said transformer is configured to receive said potential from said transducer through said chassis and to convey said potential to an amplifier; and,
further characterized by a low impedance housing acoustically coupled by said lateral rails to a high impedance metal chassis, wherein said housing has a mass that is similar to or greater than the mass of said chassis.