Loudspeakers and their usage

Abstract

An electroacoustic driver usable in a loudspeaker system that utilizes a driver having a magnetic negative spring (MNS). The magnet of the MNS may be arranged to have an MNS rotating magnetic core that is rotatable in a plane perpendicular to the axis of movement of the MNS armature, and the magnitudes of the first magnetic negative spring force and the second magnetic negative spring force may vary based on the rotational position of the rotating magnetic core. The loudspeaker may include an enclosure, a sound panel mechanically connected to the enclosure, and a magnetic negative spring having a first permanent magnet connected to the armature and a second permanent magnet rotatable relative to the first permanent magnet in response to a feedback signal.

Claims

1. It is a loudspeaker, (a) Enclosure and, (b) A sound panel mechanically connected to the enclosure, (c) A movable armature mechanically connected to the sound panel, including a voice coil, wherein the movable armature is operable to move the sound panel toward the enclosure along a first axis to generate a first air pressure, and to move the sound panel toward the enclosure along the first axis to generate a second air pressure, (d) A magnetic negative spring comprising a first magnetic negative spring portion mechanically connected to the movable armature and a second magnetic negative spring portion fixed in the first axial direction relative to the enclosure, (i) The magnetic negative spring is operable to provide a first magnetic negative spring force when the sound panel moves toward the enclosure along the first axis, and to provide a second magnetic negative spring force when the sound panel moves away from the enclosure along the first axis. (ii) The first magnetic negative spring force is directed in the opposite direction to the first air pressure, (iii) The second magnetic negative spring force is directed in the opposite direction to the second air pressure, (iv) The first magnetic negative spring portion includes a first armature magnet, (v) The second magnetic negative spring portion includes a rotating magnetic core that is rotatable in a plane perpendicular to the first axis, and the magnitude of the first magnetic negative spring force and the magnitude of the second magnetic negative spring force change based on the rotational position of the rotating magnetic core. Magnetic negative spring and A loudspeaker equipped with [feature].

2. A loudspeaker according to claim 1, (a) When the rotating magnetic core is rotated to the first position, the magnitudes of the first and second magnetic negative spring forces and the second magnetic negative spring force become maximum, (b) When the rotating magnetic core is rotated to the first and second positions, the magnitudes of the first magnetic negative spring force and the second magnetic negative spring force are minimized. (c) The rotating magnetic core is rotatable to any position between the first position and the second position. Loudspeaker.

3. The loudspeaker according to claim 2, wherein the minimum magnitude of the first and second magnetic negative spring forces and the second magnetic negative spring force is less than 20% of the magnitude of the first and second magnetic negative spring forces and the second magnetic negative spring force.

4. The loudspeaker according to claim 2, wherein the minimum magnitude of the first and second magnetic negative spring forces and the second magnetic negative spring force is less than 10% of the maximum magnitude of the first and second magnetic negative spring forces and the second magnetic negative spring force.

5. The loudspeaker according to claim 2, wherein the maximum magnitude of the first and second magnetic negative spring forces and the second magnetic negative spring force is a peak force exceeding 50 Newtons.

6. The loudspeaker according to claim 2, wherein the maximum magnitude of the first and second magnetic negative spring forces and the second magnetic negative spring force is a peak force exceeding 100 Newtons.

7. The loudspeaker according to claim 2, wherein the maximum magnitude of the first and second magnetic negative spring forces and the second magnetic negative spring force is a peak force exceeding 200 Newtons.

8. The loudspeaker according to claim 2, wherein the rotating magnetic core is rotatable in response to a feedback sensor.

9. The loudspeaker according to claim 8, wherein the feedback signal is obtained from a pressure sensor.

10. The loudspeaker according to claim 8, wherein the feedback signal is obtained from a voice coil resonant frequency algorithm.

11. The loudspeaker according to claim 8, wherein the feedback signal is obtained from a music file.

12. The loudspeaker according to claim 11, wherein an algorithm scans a music file to determine the main low-frequency sounds and instructs a rotating magnetic core to rotate to a position where the voice coil resonant frequency is near the frequency of the main low-frequency sounds.

13. The loudspeaker according to claim 11, wherein the rotating magnetic core rotates only during music playback.

14. A loudspeaker according to claim 8, (a) The loudspeaker further comprises a position sensor for detecting the position of the sound panel, (b) The feedback signal is obtained from the position sensor, Loudspeaker.

15. The loudspeaker according to claim 14, wherein the position sensor is an infrared position sensor.

16. The loudspeaker according to claim 1, wherein the rotating magnetic core is rotated by a rotating system comprising a motor.

17. The loudspeaker according to claim 16, wherein the motor is an electric motor.

18. The loudspeaker according to claim 16, wherein the rotating system further comprises a pulley and / or a gear.

19. A loudspeaker according to claim 1, (a) The rotating magnetic core includes a closed magnetic circuit including a first ring magnet and a second ring magnet, (b) The first ring magnet includes a plurality of first ring-shaped segment magnets arranged circumferentially in a plane perpendicular to the first axis and separated circumferentially by gaps between the first ring-shaped segments, (c) Each of the first ring-shaped segment magnets includes an inner first ring-shaped segment magnet and an outer first ring-shaped segment magnet, wherein the radius of the inner first ring-shaped segment magnet is smaller than the radius of the outer first ring-shaped segment magnet. (d) The second ring magnet includes a plurality of second ring-shaped segment magnets arranged circumferentially in a plane perpendicular to the first axis and separated circumferentially by gaps between the second ring-shaped segments, (e) Each of the second ring-shaped segment magnets includes an inner second ring-shaped segment magnet and an outer second ring-shaped segment magnet, wherein the radius of the inner second ring-shaped segment magnet is smaller than the radius of the outer first ring-shaped segment magnet. Loudspeaker.

20. The loudspeaker according to claim 19, wherein each of the first ring-shaped segment magnets has the same arc degree as each of the second ring-shaped segment magnets.

21. The loudspeaker according to claim 20, wherein each of the first ring-shaped segment gaps has the same arc degree length as each of the second ring-shaped segment gaps.

22. The loudspeaker according to claim 21, wherein the ratio of the length of the first ring-shaped segment magnet by the arc degree to the length of the gap between the first ring-shaped segment by the arc degree is in the range of 1:1 to 2:

1.

23. The loudspeaker according to claim 21, wherein the length of each arc of each of the first ring-shaped segment magnets is 60°.

24. The loudspeaker according to claim 23, wherein the length of each arc of the gap between each of the first ring-shaped segments is 30°.

25. The loudspeaker according to claim 21, wherein the length of each arc of each of the first ring-shaped segment magnets is 45°.

26. The loudspeaker according to claim 25, wherein the length of each arc of the gap between each of the first ring-shaped segments is 45°.

27. The loudspeaker according to claim 21, wherein the length of each of the first ring-shaped segment magnets, depending on the arc angle, is X, and 45° ≤ X ≤ 60°.

28. The loudspeaker according to claim 27, wherein the length of each arc of the gap between each of the first ring-shaped segments is 90°-x.

29. A loudspeaker according to claim 19, (a) The first ring magnet comprises exactly four first ring-shaped segment magnets and four gaps between the first ring-shaped segments, (b) The second ring magnet comprises exactly four second ring-shaped segment magnets and four gaps between the second ring-shaped segments, Loudspeaker.

30. The loudspeaker according to claim 1, wherein the voice coil and the magnetic negative spring share the same magnetic circuit.

31. It is a method, (a) Selecting a loudspeaker according to any one of claims 1 to 30, (b) Rotating the rotating magnetic core in a plane perpendicular to the first axis, thereby changing the magnitude of the first and second magnetic negative spring forces and the magnitude of the second magnetic negative spring force, (c) Activating the loudspeaker to generate audible sound, Methods that include...

32. It is a loudspeaker, (a) Enclosure and, (b) A sound panel mechanically connected to the enclosure, (c) A magnetic negative spring having a first permanent magnet connected to the armature and a second permanent magnet rotatable with respect to the first permanent magnet in response to a feedback signal, A loudspeaker equipped with [feature].

33. A loudspeaker according to claim 32, (a) The first permanent magnet includes a first plurality of arc-shaped segments, (b) The second permanent magnet includes a second plurality of arc-shaped segments, The loudspeaker according to claim 32.

34. The loudspeaker according to claim 32, wherein the feedback signal is a music file.

35. It is a method, (a) Selecting a loudspeaker according to any one of claims 32 to 34, (b) Rotating the second permanent magnet relative to the first permanent magnet in response to the feedback signal, (c) Activating the loudspeaker to generate audible sound, Methods that include...

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