Electro-Acoustic Transducer with Radiating Accoustic Seal And Stacked Magnetic Circuit Assembly

Patent metadata

Field	Value
Publication number	US-2016345099-A1
Application number	US-201514718470-A
Country	US
Kind code	A1
Filing date	May 21, 2015
Priority date	May 21, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

An electro-acoustic transducer includes an accordion-type structure that functions as both an acoustic radiation element and an acoustic seal. In one example, the transducer includes parallel, accordion-type structures that attach to a flat, rectangular diaphragm. The diaphragm is connected to a voice coil. The voice coil and an associated frame are positioned between a magnet arrangement. The magnet arrangement includes stacked magnet pairs positioned between pole pieces to focus magnetic flux.

First claim

What is claimed is:

1 . An electro-acoustic transducer comprising:
a diaphragm; a support structure; and a first accordion-type structure connecting the diaphragm to the support structure, wherein the first accordion-type structure and the diaphragm each vibrate to generate sound.

2 . The electro-acoustic transducer of claim 1 , wherein the first accordion-type structure and the diaphragm form at least part of an enclosed space.

3 . The electro-acoustic transducer of claim 1 , wherein the first accordion-type structure comprises first and second surfaces that form an accordion-type pleat.

4 . The electro-acoustic transducer of claim 1 , wherein the diaphragm is substantially planar.

5 . The electro-acoustic transducer of claim 1 , further comprising a second accordion-type structure connecting the diaphragm to the support structure, wherein the second accordion-type structure vibrates to generate sound.

6 . The electro-acoustic transducer of claim 5 , further comprising a third accordion-type structure connecting the diaphragm to the support structure, wherein the third accordion-type structure vibrates to generate sound.

7 . The electro-acoustic transducer of claim 1 , wherein the first accordion-type structure forms an acoustic seal with the diaphragm and the support structure.

8 . The electro-acoustic transducer of claim 1 , further comprising sound insulating material in contact with the first accordion-type structure.

9 . The electro-acoustic transducer of claim 8 , wherein the sound insulating material comprises foam.

10 . The electro-acoustic transducer of claim 1 , further comprising a frame connecting the diaphragm and a voice coil, wherein the frame is configured to transfer sound producing vibration from the voice coil to the diaphragm.

11 . The electro-acoustic transducer of claim 10 , wherein the voice coil is substantially planar.

12 . The electro-acoustic transducer of claim 1 , further comprising a frame connecting the diaphragm and a voice coil, wherein the frame suspends the diaphragm in relation to the voice coil.

13 . The electro-acoustic transducer of claim 12 , wherein the first accordion-type structure suspends the diaphragm in relation to the voice coil.

14 . An electro-acoustic transducer comprising:
a diaphragm including first and second edges; a first accordion-type structure in contact with the first edge; and a second accordion-type structure in contact with the second edge, wherein the diaphragm and the first and second accordion-type structures form a partial cavity and each vibrate to produce sound.

15 . The electro-acoustic transducer of claim 14 , further comprising a frame connecting the diaphragm and a voice coil, wherein the frame is configured to transfer sound producing vibration from the voice coil to the diaphragm.

16 . The electro-acoustic transducer of claim 15 , wherein the voice coil is substantially planar.

17 . The electro-acoustic transducer of claim 14 , further comprising sound insulating material in contact with at least the first accordion-type structure.

18 . The electro-acoustic transducer of claim 14 , wherein the diaphragm is substantially planar.

19 . The electro-acoustic transducer of claim 14 , wherein the first and second accordion-type structures form an acoustic seal with the diaphragm and a support structure.

20 . An electro-acoustic transducer comprising:
a substantially planar diaphragm; at least one accordion-type structure connecting the diaphragm to a support structure; a sound insulating material in contact with the at least one accordion-type structure; and a frame connecting the diaphragm and a voice coil, wherein the frame is configured to transfer sound producing vibration from the voice coil to the diaphragm, and the diaphragm and the at least one accordion-type structure each vibrate to produce sound.

21 . The electro-acoustic transducer of claim 20 , wherein the at least one accordion-type structure forms an acoustic seal with the diaphragm and the support structure.

22 . The electro-acoustic transducer of claim 20 , wherein the sound insulating material forms an acoustic seal with the accordion-type structure.

23 . The electro-acoustic transducer of claim 20 , wherein the sound insulating material comprises foam.

Assignees

• Bose Corp

Inventors

• Bushko Darek
• Bushko Wit

Classifications

• H04R7/18 Primary

  at the periphery · CPC title

• H04R7/04

  Plane diaphragms · CPC title

• H04R2307/201

  Damping aspects of the outer suspension of loudspeaker diaphragms by addition of additional damping means · CPC title

• H04R9/025

  Magnetic circuit · CPC title

• H04R7/20 Primary

  Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands · CPC title