Permanent magnet type loudspeaker unit - has dish integrally formed with frame so that inner dia. of former can equal dia. of upper plate of magnetic system

摘要

The loudspeaker consists of a permanent magnet system, an oscillating coil and fan frame. On the frame (1) a dish (2) is integrally formed, into which the magnet system (3) and the oscillating coil (4) are inserted in precise locations. The internal dia. of the dish is the same as the external dia. of the upper plate (3') of the permanent magnet system (3). At the base of the dish (2) are centering guides (2"), which consist of tappets or holes. In the fan-out frame structure (1), the oscillating coil (4) is soldered to the membrane (4), to hold it, on insertion. Centering guides are pressed into the centre of the solder (5). The fan-out frame (1) is built out of material which can be magnetised.