Horn body and horn having such a horn body

摘要

0 An electromagnetic horn, has a dished body (10) containing a coil (11), an armature (12), and a make-and-break mechanism 14. The body (10) has an integral flange (17) to which a diaphragm (13) is secured in surface-to-surface contact by an aluminium clamping ring (18). The horn has pleasant tonal characteristics because it is formed of a non-alloy steel having nitrogen diffused therein so as to be in solid solution in a ferritic matrix and also has an epsilon iron nitride surface layer. Part of the layer is porous and contains oil with the result that it has a high corrosion resistance. The good tribological properties of the epsilon iron nitride layer enable the usual paper gasket between the diaphragm (13) and the flange (17) to be dispensed with.