H - Electricity – 04 – R
Patent
H - Electricity
04
R
26/125, 349/70
H04R 11/06 (2006.01) H04R 11/00 (2006.01) H04R 13/02 (2006.01)
Patent
CA 1175548
ABSTRACT IMPROVEMENTS IN OR RELATING TO TELEPHONE TRANSDUCERS An acoustic transducer of novel structure suitable for automatic assembly is made by arranging with its wall upwards a generally cup-shaped rear cover having a cylindrical wall out-turned at its upper end and extending from the rim of a base divided along a chord into a major segment for receiving an electromagnetic driving unit and a terminal receiving minor segment at a higher vertical level than the major segment. The major segment has on its inner face fixing lands disposed symmetrically with respect to a diameter normal to said chord offset away from the minor segment and extending inwards from the side wall. Each fixing land is formed to define a fixing location and having on its face presented to the minor segment an upstanding locator wall. A yoke and coil sub-assembly lowered into the rear cover is defined by a cruciform yoke plate of magnetisable material having a magnet at its centre with one pair of upturned opposite arms directed along the diameter normal to said chord the said pair of arms defining pole pieces and carrying coils and with the other pair of upturned opposite arms parallel to the said chord and formed with outturned fixing ears that settle directly on said lands behind said locator wall with through-holes therein aligning with said fixing locations of said lands. Onto the yoke and coil sub-assembly is placed downwardly an armature formed with depending bearing means that settle on the magnet and permit the armature to rock thereon and a pair of torsion arms extending towards the lands and terminating in fixing ears that settle behind the locator wall on the fixing ears of the coil sub-assembly with through-holes aligning with said fixing locations of said lands. The armature has secured thereto an upstanding connecting rod. The armature is mechanically fixed from above the rear cover in tight contact with the yoke plate and the yoke plate is fixed in tight contact with the lands so that the armature is supported for vibration in said rear cover. Connector terminals are introduced through said minor segment and electrically connected to the coils. A dished diaphragm is placed downward onto the rear cover so that its rim settles on the out-turned end of the cylindrical wall and the connecting rod projects through a through-hole in said diaphragm. Then the connecting rod is adhered to the diaphragm and a front cover is assembled to the rear cover.
411374
Charlesworth David V.
Smith Derek F.
A.p. Besson Limited
Sim & Mcburney
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