Unified wavefront full-range waveguide for a loudspeaker

• US 10,356,512 B1
• Filed: 01/12/2018
• Issued: 07/16/2019
• Est. Priority Date: 01/12/2018
• Status: Active Grant

• Current Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Original Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Inventors: Peace, Jr., Paul Wayne
• Primary Examiner(s): Dabney, Phylesha
• Application Number:
  US15/869,719
• Time in Patent Office: 550 Days
• Field of Search: 381340
• CPC Class Codes: H04R 1/025 Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
• CPC Class Codes: H04R 1/24 Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
• CPC Class Codes: H04R 1/30 Combinations of transducers with horns, e.g. with mechanical matching means , i.e. front-loaded hornshorns in general G10K; transducer enclosures or mountings using a back-loaded horn H04R1/2861; application of horns as guiding means to obtain a predetermined directivity characteristic H04R1/345
• CPC Class Codes: H04R 1/345 for loudspeakers
• CPC Class Codes: H04R 1/403 loud-speakers
• CPC Class Codes: H04R 3/14 Cross-over networks

Abstract

A loudspeaker may include a full-range waveguide for creating a unified wavefront. The waveguide may include a plurality of entrances, which may be positioned at a first axial end. The waveguide may include a mouth disposed at a second axial end opposite the plurality of entrances. A contoured surface extending between the entrance and the mouth defines a cavity within the waveguide. The contoured surface may include a first pair of walls positioned opposite one another and a second pair of walls positioned opposite one another. The waveguide may include at least one integrator disposed in the cavity between two adjacent entrances. Each integrator may extend transversely between the first pair of walls and may taper towards the mouth to form a pointed edge extending between the first pair of walls. A pair of integrator surfaces each include a solid portion and a perforated portion.

Claims

1. A loudspeaker comprising:

a loudspeaker enclosure;

a plurality of high-frequency transducers disposed within the loudspeaker enclosure and aligned along a first plane;

at least one lower frequency transducer disposed within the loudspeaker enclosure; and

a waveguide mounted to the loudspeaker enclosure, the waveguide including;

a plurality of entrances positioned at a first axial end of the waveguide, each entrance overlaying one of the high-frequency transducers;

a mouth disposed at a second axial end of the waveguide opposite the plurality of entrances;

a first pair of walls positioned opposite one another connecting each entrance to the mouth, each lower frequency transducer configured to be mounted to one of the first pair of walls; and

at least one integrator disposed between adjacent entrances and extending transversely between the first pair of walls, each integrator tapering towards the mouth to form a pointed edge in the first plane.

2. The loudspeaker of claim 1, further comprising a plurality of throats corresponding to the plurality of entrances, each throat extending between an entrance and a throat opening.

3. The loudspeaker of claim 2, further comprising a contoured surface extending between the throat opening and the mouth defining a cavity of the waveguide, the contoured surface defined by the first pair of walls position opposite one another and a second pair of walls positioned opposite one another.

4. The loudspeaker of claim 1, wherein the plurality of HF transducers includes three HF transducers and the at least one lower frequency transducer includes two lower frequency transducers.

5. The loudspeaker of claim 1, wherein each integrator has a pair of integrator surfaces angled with respect to one another, each integrator surface including a solid portion and a perforated portion.

6. The loudspeaker of claim 5, wherein the solid portion may be disposed adjacent the first pair of walls.

7. The loudspeaker of claim 5, wherein the perforated portion is adjacent at least of portion of the pointed edge.

8. The loudspeaker of claim 1, further comprising at least one acoustic opening in the first pair of walls disposed between a pair of integrators and overlaying at least a portion of a radiating surface of the at least one lower-frequency transducer.

9. The loudspeaker of claim 8, wherein a perforated cover is disposed in each acoustic opening.

10. The loudspeaker of claim 8, wherein the at least one acoustic opening is rectangular-shaped.

11. The loudspeaker of claim 1, further comprising a phase plug disposed between each lower frequency transducer and the waveguide.

12. A waveguide for use with a loudspeaker, the waveguide comprising:

a plurality of entrances positioned at a first axial end of the waveguide and aligned along a first plane, each entrance configured to overlay a high-frequency transducer;

a mouth disposed at a second axial end of the waveguide opposite the plurality of entrances;

a contoured surface extending between the entrances and the mouth defining a cavity of the waveguide, the contoured surface defined by at least a first pair of walls positioned opposite one another;

at least one integrator disposed in the cavity between adjacent entrances and extending transversely between the first pair of walls, each integrator having a pair of integrator surfaces that form a taper towards the mouth in the first plane; and

at least one acoustic opening in the first pair of walls configured to overlay at least a portion of a radiating surface of a lower frequency transducer.

13. The waveguide of claim 12, wherein each integrator surface includes a solid portion and a perforated portion.

14. The waveguide of claim 12, wherein each integrator is a separate component mounted to the waveguide.

15. The waveguide of claim 14, wherein the waveguide includes at least one slot along the first pair of walls for receiving each integrator.

16. The waveguide of claim 12, wherein the at least one acoustic opening is rectangular shaped.

17. The waveguide of claim 12, wherein the waveguide includes a rim surrounding the mouth for attaching to a loudspeaker enclosure, the rim extending beyond the first pair of walls along a plane of the mouth to define a pair of ports, one on each side of the waveguide.

18. An integrator for a loudspeaker waveguide comprising:

a pair of integrator surfaces angled with respect to one another, each integrator surface being having at least a proximal base and a distal base, the integrator surfaces intersecting at their respective distal bases;

wherein each integrator surface includes a solid portion and a perforated portion.

19. The integrator of claim 18, wherein the perforated portion is triangular-shaped and adjacent at least of portion of the distal base.

20. The integrator of claim 19, wherein each integrator surface is trapezoidal-shaped with the proximal base being smaller than the distal base.