against moisture and dust, in particular eisenstaub, geschuetzter, composition, in particular elektrodynamischer converters.

摘要

1. An electroacoustic, especially electrodynamic, transducer which is protected against moisture and dust, especially iron dust, having a transducer housing (5) in which the transducer diaphragm (1) is mounted, and a protective device (11, 12) which is fastened, in front of the diaphragm (1), to the transducer housing and which has at least one sound entry aperture for the entry of the sound from the external space and at least one sound exit aperture for the emergence of the sound to the diaphragm as well as an interspace (9) which is formed between the sound entry and sound exit aperture or apertures and in which a labyrinth guide, which holds back drops of moisture, dust particles and the like, for the sound is formed, characterised in that the protective device consists only of two plates (11, 12) formed from plastics material, the one (12) of which is seated releasably on the transducer housing (5), and the other (11) of which is held with its edge on that side of the one plate (12) which is averted from the diaphragm (1), and in that the two plates (11, 12) are provided with annular prominences which are formed integrally on them and which are concentric to the transducer diaphragm (1) and which, radially spaced from one another, project into the interspace (9) formed between the two plates (11, 12), whereby the prominences (15-18) of the two plates (11, 12) project beyond one another in the axial direction.