Loudspeaker system with improved sound

Patent metadata

Field	Value
Publication number	US-9794659-B2
Application number	US-201514729856-A
Country	US
Kind code	B2
Filing date	Jun 3, 2015
Priority date	Aug 23, 2010
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A loudspeaker device is presented which includes a zeolite material comprising zeolite particles having a silicon to aluminum mass ratio of at least 200. For an increased pore fraction of pores with a diameter in a range between 0.7 micrometer and 30 micrometer shows an increased shift of the resonance frequency down to lower frequencies has been observed.

First claim

What is claimed is:

1. An acoustic element for placement in a back volume of an acoustic device, the acoustic element comprising a plurality of zeolite grains, wherein the zeolite grains have a silicon to aluminum mass ratio of at least 200, wherein the acoustic element, when exposed to acoustic pressure within the back volume of the acoustic device, changes the acoustic compliance of gases contained within the back volume of the acoustic device, and wherein the plurality of the zeolite grains are comprised of:
a plurality of zeolite particles comprising silicon dioxide and aluminum constituents; and
a binder material that adheres the zeolite particles together into a zeolite grain.

2. The acoustic element according to claim 1 , wherein the zeolite grains comprise zeolite particles having a mean diameter less than or equal to 10 micrometers.

3. The acoustic element according to claim 1 , wherein the zeolite grains comprise zeolite particles having a mean diameter greater than or equal to 0.1 micrometers.

4. The acoustic element according to claim 1 , wherein the zeolite grains comprise zeolite particles having a plurality of micropores, and the micropores have pore diameters between 0.4 nanometers and 0.7 nanometers.

5. The acoustic element according to claim 1 , wherein the zeolite grains comprise zeolite particles having one or more of the structures FER, MFI, CHA, IHW, IWV, ITE, UTL, VET, or MTW.

6. The acoustic element according to claim 1 , wherein the zeolite grains comprise zeolite particles that are hydrophobic, are electrically insulating, and are non-corrosive to metal.

7. The acoustic element according to claim 1 , wherein the zeolite grains comprise zeolite particles having a plurality of micropores, and the micropores have a mean diameter in a first diameter range;
wherein the zeolite grains comprise a plurality of macropores disposed between the zeolite particles, and the macropores have a mean diameter in a second diameter range; and
wherein the second diameter range is greater than or equal to the first diameter range by at least one order of magnitude.

8. The acoustic element according to claim 7 , wherein the first diameter range is between 0.4 nanometers and 0.7 nanometers.

9. The acoustic element according to claim 7 , wherein the second diameter range is greater than or equal to 50 nanometers.

10. The acoustic element according to claim 7 , wherein the macropores have a pore diameter distribution with a local peak in a diameter range between 0.7 micrometers and 30 micrometers.

11. The acoustic element according to claim 1 , wherein the whole mass of the binder material in the zeolite grains in relation to the whole mass of the zeolite grains is in the range from 1% to 20%.

12. The acoustic element according to claim 1 , wherein the mean diameter of the zeolite grains is greater than or equal to 100 micrometers.

13. The acoustic element according to claim 12 , wherein the mean diameter of the zeolite grains is less than or equal to 900 micrometers.

14. The acoustic element according to claim 1 , wherein the mean diameter of the zeolite grains is between 200 micrometers and 700 micrometers.

15. The acoustic element according to claim 14 , wherein the mean diameter of the zeolite grains is between 300 micrometers and 500 micrometers.

16. The acoustic element according to claim 14 , wherein the mean diameter of the zeolite grains is between 500 micrometers and 600 micrometers.

17. The acoustic element according to claim 1 , wherein the zeolite grains have a high sorption capacity for nitrogen gas and a high sorption coefficient at approximately one atmosphere of pressure.

18. An acoustic element for placement in a back volume of an acoustic device, the acoustic element comprising a plurality of zeolite grains, wherein the zeolite grains have a silicon to aluminum mass ratio of at least 200, and wherein the acoustic element, when exposed to acoustic pressure within the back volume of the acoustic device, changes the acoustic compliance of gases contained within the back volume of the acoustic device, wherein the plurality of the zeolite grains are comprised of:
a plurality of zeolite particles comprising silicon dioxide and aluminum constituents; and
a polymer binder material that adheres the zeolite particles together into a zeolite grain.

19. The acoustic element according to claim 18 , wherein the zeolite grains comprise zeolite particles having one of the structures CHA, IHW, IWV, ITE, UTL, VET, or MTW.

20. The acoustic element according to claim 18 , wherein the zeolite grains comprise zeolite particles having a mean diameter between 0.1 micrometers and 10 micrometers.

21. The acoustic element according to claim 18 , wherein the zeolite grains comprise zeolite particles that are hydrophobic, are electrically insulating, and are non-corrosive.

22. The acoustic element according to claim 18 , wherein the relation of the whole mass of the polymer binder material of a zeolite grain to the whole mass of a zeolite grain is in the range from 1% to 20%.

23. The acoustic element according to claim 18 , wherein the polymer binder material is formed from a polyacrylate suspension, a polystyrolacetate suspension, a polyvinylacetate suspension, a polyethylvinylacetate suspension, or a polybutadien rubber suspension.

24. The acoustic element according to claim 18 , wherein the zeolite grains have a high sorption capacity for nitrogen gas and a high sorption coefficient at approximately one atmosphere of pressure.

25. A zeolite sound adsorber for adsorbing and desorbing a gas medium contained within a substantially closed volume, the zeolite sound adsorber comprising a plurality of zeolite grains, wherein a plurality of the zeolite grains are comprised of:
a plurality of zeolite particles each comprising silicon and aluminum constituents, wherein the silicon to aluminum mass ratio of the particle is at least 200;
a binder material that binds the plurality of zeolite particles together, wherein the mean diameter of the zeolite grains is greater than or equal to 100 micrometers; and
wherein the zeolite sound adsorber adsorbs and desorbs the gas medium based on acoustic pressure.

26. The zeolite sound adsorber according to claim 25 , wherein the zeolite sound adsorber comprises zeolite particles having one of the structures CHA, IHW, IWV, ITE, UTL, VET, or MTW.

27. The zeolite sound adsorber according to claim 25 , wherein the zeolite sound adsorber comprises zeolite particles having a mean diameter between 0.1 micrometers and 10 micrometers.

28. The zeolite sound adsorber according to claim 25 , wherein the zeolite sound adsorber comprises zeolite grains that are hydrophobic, are electrically insulating, and are non-corrosive.

29. The zeolite sound adsorber according to claim 25 , wherein the relation of the whole mass of the polymer binder material in a zeolite grain to whole mass of a zeolite grain is in the range from 1% to 20%.

30. The zeolite sound adsorber according to claim 25 , wherein the polymer binder material is formed from a polyacrylate suspension, a polystyrolacetate suspension, a polyvinylacetate suspension, a polyethylvinylacetate suspension, or a polybutadien rubber suspension.

31. The zeolite sound adsorber according to claim 25 , wherein the zeolite grains have a high sorp

Assignees

• Sound Solutions Int Co Ltd
• Nautilus Capital Corp

Inventors

• Papakyriacou Maria
• Kobler Johannes
• Sauer Jürgen

Classifications

• B01J20/264

  derived from different types of monomers, e.g. linear or branched copolymers, block copolymers, graft copolymers · CPC title

• B01J20/183

  Physical conditioning without chemical treatment, e.g. drying, granulating, coating, irradiation · CPC title

• C01B39/46

  Other types characterised by their X-ray diffraction pattern and their defined composition {(C01B39/023, C01B39/026, C01B39/06 take precedence)} · CPC title

• B01J20/28016

  Particle form · CPC title

• B01J20/2803

  Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products · CPC title