1973-12-12
1976-01-27
Blakeslee, Ralph D.
H04R 900
Patent
active
039353990
ABSTRACT:
A loud speaker of the oscillating coil type including a voice coil associated with a loud speaker membrane and a magnetic circuit having an annular air gap in which the coil is located in such a manner that in its neutral, non-energized condition the coil projects axially from the air gap substantially uniformly to both sides thereof so as to be able to oscillate substantially symmetrically about the middle plane of the air gap, a cylindric element of an electrically conducting material being rigidly associated with the magnetic circuit concentrically with the coil and extending into the air gap from one side thereof, characterised in that the cylindric element is extended so as to additionally project outwardly from the air gap to the other side thereof. It is obtained hereby that the voice coil is inductively short circuited in all working positions thereof, whereby it responds rapidly to changes of the input voltage and thus causes the sound to be reproduced with a minimum of distortion.
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