HAUT-PARLEUR POUR CASQUES A ECOUTEURS

A.HAUT-PARLEUR POUR CASQUE A ECOUTEURS.B.HAUT-PARLEUR CARACTERISE EN CE QU'IL COMPREND UN BATI, UN CIRCUIT MAGNETIQUE AYANT UN ENTREFER MAGNETIQUE MONTE DANS LE BATI, UNE MEMBRANE 13 MONTEE DANS LE BATI ET FIXEE PAR SES BORDS EXTERIEURS, UNE BOBINE 10 ENROULEE SUR UNE BOBINE DE SON 11 LIEE A LA MEMBRANE 13 ET DES MOYENS DE PROTECTION 15B, FIXES AU BOITIER, DISPOSES DEVANT LA MEMBRANE 13 ET QUI FONCTIONNENT SEULEMENT QUAND LA MEMBRANE EST SURCHARGEE.C.HAUT-PARLEUR APPLICABLE A L'ECOUTE DE LA MUSIQUE EN SOLITAIRE. A speaker unit for headphones including a magnetic circuit which has a magnetic gap and including a diaphragm which is moveable to generate sound in response to energy applied to a coil wound on a bobbin which is connected to the diaphragm and mounted within the magnetic gap and including a frame for supporting the magnetic circuit and the diaphragm and a protecting means mounted at the front of the diaphragm and having projections so as to engage the diaphragm near the region where the bobbin is mounted so as to limit the maximum motion of the diaphragm and the protecting means formed with openings such that the protector prevents the bobbin from moving completely out of the magnetic gap. The invention is applicable to speaker units for open air type headphones, for example.