Planar speaker system

• US 8,983,112 B2
• Filed: 03/14/2012
• Issued: 03/17/2015
• Est. Priority Date: 03/14/2012
• Status: Active Grant

• Current Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Original Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Inventors: Zhao, Zhijun
• Primary Examiner(s): Eason, Matthew
• Assistant Examiner(s): Nguyen, Sean H
• Application Number:
  US13/419,874
• Publication Number:
  US 20130243239A1
• Time in Patent Office: 1,098 Days
• Field of Search: 381/399, 381/412, 381/152, 381/396, 381/398, 381/403, 381/431, 381/423, 381/424, 381/425, 381/429, 381/386, 381/430, 181/171, 181/172, 181/157, 181/173
• US Class Current: 381/430
• CPC Class Codes: H04R 7/04 Plane diaphragms
• CPC Class Codes: H04R 7/045 using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
• CPC Class Codes: H04R 7/12 Non-planar diaphragms or cones
• CPC Class Codes: H04R 9/025 Magnetic circuit
• CPC Class Codes: H04R 9/06 Loudspeakers

Abstract

A planar speaker system may include a bottom frame having a cavity. Within this cavity a plurality of magnets may be arranged to form a substantially circular pattern. A diaphragm that includes a plurality of electrically conductive traces may be connected to the bottom frame and extend across the cavity of the bottom frame. When alternating current flows through the electrically conductive traces, the diaphragm may vibrate in response to the interaction between the current flowing in the electrically conductive traces and the magnetic field, thereby producing sound. The planar speaker system may include a top frame having a cavity, and a second set of magnets may be disposed in the cavity of the top frame.

Claims

1. A planar speaker system comprising:

a frame having a first frame portion and a second frame portion, the first frame portion defining a first cavity, the second frame portion defining a second cavity;

a first set of magnets disposed in the first cavity, the first set of magnets including a plurality of circumferentially spaced first magnets arranged to form a substantially circular pattern spaced outwardly from a central axis;

a second set of magnets disposed in the second cavity, the second set of magnets including a plurality of circumferentially spaced second magnets arranged to form a substantially circular pattern spaced outwardly from the central axis; and

a diaphragm located between the first and second sets of magnets, the diaphragm having a plurality of circumferentially spaced electrically conductive traces formed thereon, each of the electrically conductive traces aligned with one of the first magnets and one of the second magnets, the diaphragm being connected to the frame.

2. The planar speaker system of claim 1, where at least one of the first and second portions of the cavity are substantially circular in shape.

3. The planar speaker system of claim 2,

where the first and second frame portions each have an outer diameter that is substantially circular in shape;

where the diaphragm is substantially circular in shape and has an outer diameter; and

where the outer diameter of the diaphragm is connected to the outer diameters of the first and second frame portions.

4. The planar speaker system of claim 3, further comprising:

a first annular ring connected to the outer diameter of the first frame portion;

a second annular ring connected to the outer diameter of the second frame portion; and

the outer diameter of the diaphragm being between and connected to the first and second annular rings.

5. The planar speaker system of claim 1,

where the first frame portion has an inner diameter;

where the diaphragm has an inner diameter; and

a pole piece connected to the inner diameter of the first frame portion and the inner diameter of the diaphragm.

6. The planar speaker system of claim 1,

where the second frame portion has an inner diameter;

and

the pole piece connected to the inner diameter of the second frame portion and the inner diameter of the diaphragm.

7. The planar speaker system of claim 1, where the first set of magnets or second set of magnets are each substantially trapezoidal in shape.

8. The planar speaker system of claim 1, where the first set of magnets or second set of magnets are each substantially triangular in shape.

9. The planar speaker system of claim 1, where the first set of magnets or second set of magnets are either ferrite magnets or rare-earth magnets.

10. A planar speaker system comprising:

a frame having a first frame portion and a second frame portion, the first frame portion defining a first cavity, the second frame portion defining a second cavity;

a first set of magnets disposed in the first cavity, the first set of magnets including a plurality of circumferentially spaced first magnets arranged to form a substantially circular pattern spaced outwardly from a central axis;

a second set of magnets disposed in second cavity, the second set of magnets including a plurality of circumferentially spaced second magnets arranged to form a substantially circular pattern spaced outwardly from the central axis;

a diaphragm located between the first and second sets of magnets, the diaphragm having a plurality of circumferentially spaced electrically conductive traces formed thereon, each of the electrically conductive traces aligned with one of the first magnets and one of the second magnets, the diaphragm being connected to the frame;

where the first and second frame portions each have inner diameters;

where the diaphragm has an inner diameter; and

a pole piece connected to the inner diameters of the first and second frame portions and the inner diameter of the diaphragm.

11. The planar speaker system of claim 10, where at least one of the first and second portions of the cavity are substantially circular in shape.

12. The planar speaker system of claim 11,

where the first and second frame portions each have an outer diameter that is substantially circular in shape;

where the diaphragm is substantially circular in shape and has an outer diameter; and

where the outer diameter of the diaphragm is connected to the outer diameters of the first and second frame portions.

13. The planar speaker system of claim 12, further comprising:

a first annular ring connected to the outer diameter of the first frame portion;

a second annular ring connected to the outer diameter of the second frame portion; and

the outer diameter of the diaphragm being between and connected to the first and second annular rings.

14. The planar speaker system of claim 10, where the first set of magnets or second set of magnets are each substantially trapezoidal in shape.

15. The planar speaker system of claim 10, where the first set of magnets or second set of magnets are each substantially triangular in shape.

16. The planar speaker system of claim 10, where the first set of magnets or second set of magnets are either ferrite magnets or rare-earth magnets.

17. The planar speaker system of claim 10, where the first or second frame portions are formed to include a plurality of openings arranged in a circular pattern.

18. A planar speaker system comprising:

a frame having a first frame portion and a second frame portion, the first frame portion defining a first cavity, the second frame portion defining a second cavity;

a first set of magnets disposed in the first cavity, the first set of magnets including a plurality of circumferentially spaced first magnets arranged to form a substantially circular pattern spaced outwardly from a central axis;

a second set of magnets disposed in second cavity, the second set of magnets including a plurality of circumferentially spaced second magnets arranged to form a substantially circular pattern spaced outwardly from the central axis;

a diaphragm located between the first and second sets of magnets, the diaphragm having a plurality of circumferentially spaced electrically conductive traces formed thereon, each of the electrically conductive traces aligned with one of the first magnets and one of the second magnets, the diaphragm being connected to the frame;

where the first or second frame portions are formed to include a plurality of openings arranged in a circular pattern.

19. The planar speaker system of claim 18, where at least one of the first and second portions of the cavity are substantially circular in shape.

20. The planar speaker system of claim 19,

where the first and second frame portions each have an outer diameter that is substantially circular in shape;

where the diaphragm is substantially circular in shape and has an outer diameter; and

where the outer diameter of the diaphragm is connected to the outer diameters of the first and second frame portions.

21. The planar speaker system of claim 20, further comprising:

a first annular ring connected to the outer diameter of the first frame portion;

a second annular ring connected to the outer diameter of the second frame portion; and

the outer diameter of the diaphragm being between and connected to the first and second annular rings.

22. The planar speaker system of claim 18,

where the first frame portion has an inner diameter;

where the diaphragm has an inner diameter; and

a pole piece connected to the inner diameter of the first frame portion and the inner diameter of the diaphragm.

23. The planar speaker system of claim 18,

where the second frame portion has an inner diameter;

and

the pole piece connected to the inner diameter of the second frame portion and the inner diameter of the diaphragm.

24. The planar speaker system of claim 18, where the first set of magnets or second set of magnets are each substantially trapezoidal in shape.

25. The planar speaker system of claim 18, where the first set of magnets or second set of magnets are each substantially triangular in shape.

26. The planar speaker system of claim 18, where the first set of magnets or second set of magnets are either ferrite magnets or rare-earth magnets.