Electro-acoustic transducer with radiating acoustic seal and stacked magnetic circuit assembly

Patent metadata

Field	Value
Publication number	US-9641938-B2
Application number	US-201514718470-A
Country	US
Kind code	B2
Filing date	May 21, 2015
Priority date	May 21, 2015
Publication date	May 2, 2017
Grant date	May 2, 2017

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 having first and second ends, wherein the support structure is planar and extends in a first direction;
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;
a voice coil configured to generate vibrations, wherein the voice coil is substantially planar and extends in a second direction that is perpendicular to the first direction, and wherein the voice coil is positioned within boundaries defined by the first and second ends of the support structure; and
a frame connecting the diaphragm and the voice coil, wherein the frame suspends and maintains a relative position of the diaphragm in relation to the voice coil.

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 , 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 , wherein the first accordion-type structure suspends the diaphragm in relation to the voice coil.

13. An electro-acoustic transducer comprising:
a diaphragm including first and second edges;
a first accordion-type structure in contact with the first edge;
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;
a voice coil configured to generate vibrations, wherein the voice coil is substantially planar and positioned within boundaries defined by the first and second edges; and
a frame connecting the diaphragm and the voice coil, wherein the frame suspends and maintains a relative position of the diaphragm in relation to the voice coil.

14. The electro-acoustic transducer of claim 13 , wherein the frame is configured to transfer sound producing vibration from the voice coil to the diaphragm.

15. The electro-acoustic transducer of claim 13 , further comprising sound insulating material in contact with at least the first accordion-type structure.

16. The electro-acoustic transducer of claim 13 , wherein the diaphragm is substantially planar.

17. The electro-acoustic transducer of claim 13 , wherein the first and second accordion-type structures form an acoustic seal with the diaphragm and a support structure.

18. An electro-acoustic transducer comprising:
a substantially planar diaphragm and extends in a first direction;
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;
a voice coil configured to generate vibrations, wherein the voice coil is substantially planar and extends in a second direction that is parallel to the first direction; and
a frame connecting the diaphragm and the voice coil, wherein the frame suspends and maintains a relative position of the diaphragm in relation to the voice coil.

19. The electro-acoustic transducer of claim 18 , wherein the at least one accordion-type structure forms an acoustic seal with the diaphragm and the support structure.

20. The electro-acoustic transducer of claim 18 , wherein the sound insulating material forms an acoustic seal with the accordion-type structure.

21. The electro-acoustic transducer of claim 18 , wherein the sound insulating material comprises foam.

22. The electro-acoustic transducer of claim 13 , wherein a plane defined by the voice coil extends is perpendicular to a plane defined by the diaphragm.

23. The electro-acoustic transducer of claim 13 , wherein a plane defined by the voice coil is parallel to a plane defined by the diaphragm.

Assignees

• Bose Corp

Inventors

• Bushko Darek
• Bushko Wit

Classifications

• H04R7/04

  Plane diaphragms · CPC title

• H04R9/025

  Magnetic circuit · CPC title

• H04R7/18 Primary

  at the periphery · CPC title

• H04R2307/201

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

• H04R7/20 Primary

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