ELECTRO ACOUSTIC TRANSDUCER

摘要

A moving coil capsule for a telephone handset is designed for high speed mass production. It consists of a carrier ring (1) and diaphragm (2) formed as an interim sub-assembly in a first buffer store. A coil (6) preparation and finishing stage applies the coil (6) on a former in the form of an aluminium dome (5) and inserts the dome (5) into a nest (7) in the diaphragm to form a first sub-assembly in a second buffer store. A magnet assembly (10, 11 and 12) is manufactured using quick curing glue with the outer pole piece (12) formed by an accurate stamping whose outer rim fits precisely in a reference datum (1a) in the carrier ring. The interim sub-assemblies and magnet assemblies are made one at a time, and the first sub-assemblies are formed two at a time from the interim sub-assemblies, but at half the speed. Final assembly of the magnet assembly and first sub-assembly together with a rear cover (14) is carried out and a throughput at a rate of one capsule in less than four seconds can be achieved.