Audio loudspeaker

• US 20050078850A1
• Filed: 09/08/2004
• Published: 04/14/2005
• Est. Priority Date: 09/08/2003
• Status: Abandoned Application

• Current Assignee: John M. Norton
• Original Assignee: John M. Norton
• Inventors: Norton, John M.
• Application Number:
  US10/936,160
• Publication Number:
  US 20050078850A1
• Time in Patent Office: Days
• US Class Current: 381/423
• CPC Class Codes: H04R 7/14 corrugated, pleated or ribbed

Abstract

The invention describes the incorporation of surface irregularities into a loudspeaker diaphragm to control the resonances of diaphragm. Through the use of the described resonance control techniques, a single loudspeaker driver is able to offer excellent performance over a wide range of the audio spectrum. The randomness of the selected features is constrained within a set of boundary conditions to accomplish a balance of achieving the desired performance, as well as ensure that the device is practical to manufacture.

Claims

1. An audio loudspeaker diaphragm comprising:

a radiating surface; and

resonance reducing surface irregularities provided on said radiating surface.

2. The diaphragm of claim 1 wherein said resonance reducing surface irregularities are randomly arranged on said radiating surface.

3. The diaphragm of claim 1 wherein said resonance reducing surface irregularities comprise three-dimensional structural features.

4. The diaphragm of claim 3 wherein said three-dimensional structural features comprise at least one of projections and depressions formed in relief with respect to said radiating surface.

5. The diaphragm of claim 3 wherein said three-dimensional structural features are randomly arranged on said radiating surface.

6. The diaphragm of claim 4 wherein said at least one of projections and depressions are randomly arranged on said radiating surface.

7. The diaphragm of claim 3 wherein said three-dimensional structural features comprise a plurality of formations extending radially outward from a center of said radiating surface.

8. The diaphragm of claim 7 wherein said at least one formation comprises a primary portion and progressively narrower secondary portions extending from said primary portion.

9. The diaphragm of claim 1 wherein said resonance reducing surface irregularities comprise apertures.

10. The diaphragm of claim 9 wherein said apertures comprise one-dimensional slits.

11. The diaphragm of claim 9 wherein said apertures comprise two-dimensional openings.

12. The diaphragm of claim 9 wherein said apertures are covered with sealant material.

13. The diaphragm of claim 9 wherein said apertures are of the same size.

14. The diaphragm of claim 9 wherein said apertures are of different sizes.

15. The diaphragm of claim 9 wherein said apertures are randomly arranged on said radiating surface.

16. The diaphragm of claim 9 wherein said apertures are arranged in a fixed pattern on said radiating surface.

17. The diaphragm of claim 9 wherein said apertures decrease in size toward a center of said radiating surface.

18. The diaphragm of claim 9 wherein said apertures comprise one-dimensional slits and two-dimensional openings.

19. The diaphragm of claim 1 wherein said resonance reducing surface irregularities comprise an irregular edge provided at an outer periphery of said radiating surface.

20. The diaphragm of claim 1 wherein said irregular edge is disposed at random angles with respect to the normal of said radiating surface.

21. The diaphragm of claim 1 wherein said resonance reducing surface irregularities comprise three-dimensional structural features and apertures.

22. The diaphragm of claim 1 wherein said resonance reducing surface irregularities comprise three-dimensional structural features and an irregular edge provided at an outer periphery of said radiating surface.

23. The diaphragm of claim 1 wherein said resonance reducing surface irregularities comprise apertures and an irregular edge provided at an outer periphery of said radiating surface.

24. The diaphragm of claim 1 wherein said resonance reducing surface irregularities comprise three-dimensional structural features, apertures and an irregular edge provided at an outer periphery of said radiating surface.

25. The diaphragm of claim 1 wherein the diaphragm is a cone-type diaphragm.

26. The diaphragm of claim 24 wherein the cone-type diaphragm includes a centrally located dust cap and wherein the dust cap is provided with resonance reducing surface irregularities.

27. The diaphragm of claim 1 wherein the diaphragm is a dome-type diaphragm.

28. An audio loudspeaker comprising the diaphragm of claim 1.