MICRO MAGNETIC SPEAKER DEVICE WITH BALANCED MEMBRANE
A micro magnetic device with a micro magnetic speaker unit having a first element, a second element, and a membrane therebetween. Each of the elements comprises a body, a pole of soft magnetic material, an electrically conductive coil positioned around the pole, and a permanent magnet connected to the membrane. The first element and the second element are magnetically identical. A plurality of speaker units can be combined to provide a speaker array.
1 . A micro magnetic speaker unit comprising:
a first speaker module, a second speaker module, and a membrane therebetween;
each speaker module comprising a body, a pole comprising a soft magnetic material, an electrically conductive coil positioned around the pole, and a permanent magnet connected to the membrane,
wherein the first speaker module and the second speaker module are magnetically identical.
2 . The micro magnetic speaker unit of claim 1 wherein the first speaker module and the second speaker module are structurally identical.
3 . The micro magnetic speaker unit of claim 2 wherein the first speaker module and the second speaker module are metallurgically identical.
4 . The micro magnetic speaker unit of claim 1 , wherein for each speaker module, the permanent magnet is centered over the pole.
5 . The micro magnetic speaker unit of claim 1 wherein the body of each module is rectangular.
6 . The micro magnetic speaker unit of claim 5 , wherein the body of each speaker module comprises at least one unbounded side.
7 . The micro magnetic speaker unit of claim 4 , wherein the body of each speaker module comprises two unbounded sides.
8 . The micro magnetic speaker unit of claim 1 wherein the body of each module comprises walls having a distal return.
9 . A micro magnetic speaker unit comprising:
a first speaker module comprising a first body having two opposite unbounded sides and two opposite walled sides, a first pole positioned between the unbounded sides and the walled sides, a first electrically conductive coil positioned around the first pole, and a first permanent magnet spaced from the first pole;
a second speaker module comprising a second body having two opposite unbounded sides and two opposite walled sides, a second pole positioned between the unbounded sides and the walled sides, a second electrically conductive coil positioned around the second pole, and a second permanent magnet spaced from the second pole; and
a membrane extending between the first speaker module and the second speaker module, the membrane supporting the first magnet on a first side and supporting the second magnet on a second side.
10 . The micro magnetic speaker unit of claim 9 wherein the first speaker module and the second speaker module are magnetically identical.
11 . The micro magnetic speaker unit of claim 10 wherein the first speaker module and the second speaker module are structurally identical.
12 . The micro magnetic speaker unit of claim 11 wherein the first speaker module and the second speaker module are metallurgically identical.
13 . The micro magnetic speaker unit of claim 9 , wherein the walled sides of each speaker module include a distal return extending toward the pole.
14 . The micro magnetic speaker unit of claim 9 wherein the first speaker module further comprises a first intermediate spacer element between the first permanent magnet and the membrane and the second speaker module further comprises a second intermediate spacer element between the second permanent magnet and the membrane.
15 . A micro speaker array comprising a plurality of micro magnetic speaker units, each unit comprising:
a first speaker module and a second speaker module, with a membrane therebetween;
each speaker module comprising a body, a pole comprising a soft magnetic material, an electrically conductive coil positioned around the pole, and a permanent magnet connected to the membrane.
16 . The micro speaker array of claim 15 wherein the first speaker module and the second speaker module of each unit are magnetically identical.
17 . The micro speaker array of claim 16 wherein the first speaker module and the second speaker module of each unit are structurally identical.
18 . The micro speaker array of claim 15 , wherein the first speaker module and the second speaker module of each unit have a rectangular body with at least one unbounded side.
19 . The micro speaker array of claim 18 , wherein the first speaker module and the second speaker module of each unit have two opposite unbounded sides.
20 . The micro speaker array of claim 19 wherein the unbounded sides of each unit are aligned.