Loudspeaker apparatus

Abstract

Provided in the present invention is a loudspeaker apparatus. The loudspeaker apparatus comprises: a support structure, the support structure comprising a support body provided with a sound generation cavity, and an annular sound hole formed at one end of the support body; an ultrasonic generation unit, the ultrasonic generation unit being located inside the sound generation cavity and fixed on the inner peripheral side of the support body, and being used for generating symmetrical ultrasonic waves; and a demodulation structure, the demodulation structure comprising a diaphragm and a plurality of fixing portions extending from the outer peripheral side of the diaphragm and distributed at intervals, wherein the fixing portions are fixed to the inner side of the sound hole and suspend the diaphragm in the sound hole, the diaphragm and the sound hole are spaced apart from each other and enclose a gap together with the fixing portions, and the ultrasonic waves generated by the ultrasonic generation unit drive the demodulation structure to vibrate, so as to adjust the size of the gap. Compared with the prior art, the loudspeaker apparatus of the present invention has a high acoustic demodulation efficiency, a good effect in increasing the amplitude of a vibration system, and a good acoustic performance.

Description

Speaker device Technical Field

[0001] The present invention relates to the field of electroacoustic conversion, and in particular to a loudspeaker device. Background Art

[0002] A speaker is a transducer device that converts electrical signals into acoustic signals. Speakers are widely used in portable electronic products, such as mobile phones, to convert audio signals into sound for playback. The increasing miniaturization of portable electronic products is driving the increasing miniaturization of speakers. A speaker's sound pressure level (SPL) and harmonic distortion (THD) are important indicators of acoustic performance. Technical issues

[0003] The speaker of the related art includes a support member, an ultrasonic vibration sound-generating unit fixed in the support member, and a baffle disposed at intervals on the side of the support member away from the ultrasonic vibration sound-generating unit. A through-hole is formed through the side of the support member close to the baffle, and a narrow gap is formed between the baffle and the support member. The narrow gap is connected to the through-hole. The ultrasonic vibration sound-generating unit emits modulated symmetrical ultrasonic sound waves. There is extremely strong nonlinearity in the narrow gap, and the symmetrical ultrasonic waves passing through it will cause distortion, thereby demodulating audible sound. However, the efficiency of the ultrasonic vibration sound-generating unit in demodulating audible sound through the narrow gap is too low, the vibration amplitude is low, and the acoustic performance is poor.

[0004] Therefore, it is necessary to provide a new speaker device to solve the above technical problems. Technical Solutions

[0005] The object of the present invention is to provide a loudspeaker device with high sound wave demodulation efficiency, good vibration system amplitude enhancement effect and excellent acoustic performance.

[0006] In order to achieve the above objectives, in a first aspect, the present invention provides a speaker device, comprising:

[0007] A support structure, comprising a support body provided with a sound cavity and a sound hole extending from one end of the support body to the other end thereof;

[0008] an ultrasonic sound-generating unit, located in the sound-generating cavity and fixed to the inner circumference of the supporting body, for emitting amplitude-modulated ultrasonic waves;

[0009] a demodulation structure, the demodulation structure being located at one end of the sound hole and fixed to the support structure, the demodulation structure and the ultrasonic sound generating unit being spaced apart along the sound generating direction of the ultrasonic sound generating unit;

[0010] The demodulation structure includes a diaphragm and a fixed part extending from the supporting structure to match the diaphragm, and a gap formed between the diaphragm and the supporting structure. The amplitude-modulated ultrasonic waves emitted by the ultrasonic sound-emitting unit drive the demodulation structure to vibrate, and the resulting change in the gap can demodulate the modulated sound wave.

[0011] Preferably, the ultrasonic sound generating unit generates out-of-plane vibration under the drive of the characteristic modulation signal and emits amplitude-modulated ultrasonic waves.

[0012] Preferably, the diaphragm of the demodulation structure vibrates under the action of the amplitude-modulated ultrasonic wave, and the mechanical resonance frequency of the diaphragm is equivalent to the carrier frequency of the amplitude-modulated ultrasonic wave.

[0013] Preferably, the vibration of the diaphragm causes a change in the geometric dimensions of the structure of the gap in at least one direction, causing the acoustic impedance of the gap to change periodically.

[0014] Preferably, the amplitude-modulated ultrasonic wave passes through the changed gap and becomes an asymmetric amplitude-modulated ultrasonic wave, which contains the demodulated modulated sound wave.

[0015] In a second aspect, an embodiment of the present invention provides a speaker device, comprising:

[0016] A support structure, comprising a support body provided with a sound cavity and a sound hole extending from one end of the support body to the other end thereof;

[0017] an ultrasonic sound-generating unit, located in the sound-generating cavity and fixed to the inner circumference of the supporting body, for emitting amplitude-modulated ultrasonic waves;

[0018] a demodulation structure, the demodulation structure being located in the sound hole and fixed to the support structure, the demodulation structure and the ultrasonic sound generating unit being spaced apart along the sound hole;

[0019] The demodulation structure includes a diaphragm and a fixed part extending from the supporting structure to match the diaphragm, and a gap formed by the diaphragm and the supporting structure. The amplitude-modulated ultrasonic wave emitted by the ultrasonic sound-emitting unit drives the demodulation structure to vibrate, and the resulting change in the gap can demodulate the modulated sound wave.

[0020] Preferably, the sound inlet and outlet axis of the slit of the demodulation structure is at right angles to the vibration direction of the ultrasonic sound-generating unit. Beneficial effects

[0021] Compared to the prior art, the speaker device of the present invention is configured such that an ultrasonic sound-generating unit is fixed to the inner circumference of a support body to emit amplitude-modulated ultrasonic waves. A demodulation structure is located at one end of the sound hole and fixed to the support structure. The demodulation structure and the ultrasonic sound-generating unit are spaced apart along the sound-generating direction of the ultrasonic sound-generating unit. The demodulation structure includes a diaphragm and a fixed portion extending from the support structure to match the diaphragm, and a gap formed between the diaphragm and the support structure. The amplitude-modulated ultrasonic waves emitted by the ultrasonic sound-generating unit drive the demodulation structure to vibrate, and the resulting change in the gap can demodulate the modulated sound waves. In this way, the ultrasonic sound-generating unit emits symmetrical ultrasonic waves, and the ultrasonic sound pressure acts on the vibrating demodulation structure, causing the demodulation structure to vibrate, changing the size of the gap formed between the demodulation structure and the sound hole, thereby changing the difficulty of the sound waves flowing out of the gap, and thus demodulating the symmetrical sound waves into audible sound. This results in high sound wave demodulation efficiency, good vibration system amplitude enhancement effect, and excellent acoustic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0023] FIG1 is a top view of a speaker device provided by an embodiment of the present invention;

[0024] FIG2 is a cross-sectional view taken along line AA of FIG1 ;

[0025] FIG3 is a schematic diagram of a demodulation structure and a sound hole partially overlapping according to an embodiment of the present invention;

[0026] FIG4 is a schematic diagram of the equivalent acoustic resistance of the gap in FIG2 ;

[0027] FIG5 is a schematic diagram of the equivalent acoustic resistance of the gap in FIG3 ;

[0028] FIG6 is a schematic diagram of a speaker device provided by another embodiment of the present invention;

[0029] FIG7 is a cross-sectional view taken along line BB of FIG6 ;

[0030] FIG8 is a first assembly diagram of a demodulation structure provided by an embodiment of the present invention;

[0031] FIG9 is a second schematic diagram of an assembly of a demodulation structure provided by an embodiment of the present invention;

[0032] FIG10 is a third assembly diagram of the demodulation structure provided by an embodiment of the present invention.

[0033] 100. Speaker device, 1. Ultrasonic sound-generating unit, 2. Demodulation structure, 21. Diaphragm, 22. Fixed part, 221. First fixed part, 222. Second fixed part, 23. First demodulation structure, 231. First demodulation body, 232. First stopper, 24. Second demodulation structure, 241. Second demodulation body, 242. Second stopper, 3. Support structure, 31. Support body, 32. Sound hole, 4. Gap, 5. Sound cavity, 6. Cavity. Modes for Carrying Out the Invention

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] 1 to 10 , an embodiment of the present invention provides a speaker device 100 , which includes a support structure 3 , an ultrasonic sound generating unit 1 , and a demodulation structure 2 .

[0036] The support structure 3 includes a support body 31 having a sound cavity 5 and a sound hole 32 extending from one end of the support body 31 to the other end thereof. The support structure 3 is used to support and fix the ultrasonic amplification unit and the demodulation structure 2.

[0037] The ultrasonic sound generating unit 1 is located in the sound generating cavity 5 and fixed in the supporting body 31, and is used to generate amplitude-modulated ultrasonic waves. Optionally, the ultrasonic sound generating unit 1 is an ultrasonic sound generating diaphragm structure.

[0038] The demodulation structure 2 is located in the sound hole 32 and fixed to the support structure 3. The demodulation structure 2 and the ultrasonic sound generating unit 1 are spaced apart along the sound generating direction of the ultrasonic sound generating unit 1. The demodulation structure 2 is used to increase the vibration performance of the speaker device 100.

[0039] The demodulation structure 2 includes a diaphragm 21 and a fixed part 22 extending from the support structure 3 to match the diaphragm 21, and a gap 4 formed between the diaphragm 21 and the support structure 3. The amplitude-modulated ultrasonic wave emitted by the ultrasonic sound-generating unit 1 drives the demodulation structure 2 to vibrate, and the change in the gap 4 caused can demodulate the modulated sound wave.

[0040] Specifically, the ultrasonic sound-generating unit 1 is used to emit amplitude-modulated ultrasonic waves, and the ultrasonic sound pressure acts on the vibrating demodulation structure 2, causing the demodulation structure 2 to vibrate, changing the size of the gap 4 formed by the demodulation structure 2 and the sound hole 32, thereby changing the difficulty of the sound wave flowing out of the gap 4, and then demodulating the symmetrical sound wave into audible sound; this makes the sound wave demodulation efficiency high, the vibration system amplitude enhancement effect good, and the acoustic performance excellent.

[0041] This ensures that the operating frequency of the demodulation structure 2 is identical to the ultrasonic wave emitted by the ultrasonic sound generating unit 1, significantly improving demodulation efficiency. Furthermore, since demodulation efficiency is directly related to the amplitude of the demodulation structure 2 (the amount of change in the gap 4), the resonant frequency of the demodulation structure 2 is preferably aligned with the carrier frequency of the ultrasonic wave emitted by the ultrasonic sound generating unit 1, and a vibration system with a higher Q value is used to increase the amplitude.

[0042] In this embodiment, the ultrasonic sound generating unit 1 generates out-of-plane vibration under the drive of the characteristic modulation signal and emits amplitude-modulated ultrasonic waves.

[0043] In this embodiment, the diaphragm 21 of the demodulation structure 3 vibrates under the action of the amplitude-modulated ultrasonic wave, and the mechanical resonance frequency of the diaphragm 21 is equivalent to the carrier frequency of the amplitude-modulated ultrasonic wave.

[0044] In this embodiment, the vibration of the diaphragm 21 causes a change in the geometric dimensions of the structure of the gap 4 in at least one direction, causing the gap acoustic impedance to change periodically.

[0045] In this embodiment, the amplitude-modulated ultrasonic wave passes through the changed gap and becomes an asymmetric amplitude-modulated ultrasonic wave, which includes the demodulated modulated sound wave.

[0046] In this embodiment, the orthographic projection of the diaphragm 21 onto the acoustic hole 32, perpendicular to the sound emission direction, is completely within the acoustic hole 32. This allows the demodulation structure 2 and the acoustic hole 32 to initially overlap at their maximum position, resulting in a maximum height of the overlapping gap 4. When the demodulation structure 2 undergoes sinusoidal vibration, the resulting change in the equivalent acoustic impedance of the gap 4 is shown in FIG4 . This can induce symmetrical ultrasonic distortion, but the distortion will be significant.

[0047] In this embodiment, the orthographic projection of the diaphragm 21 perpendicular to the sound emission direction onto the sound hole 32 is located within the range of the sound hole 32. This allows the demodulation structure 2 and the sound hole 32 to initially partially overlap. The resulting equivalent acoustic impedance (sinusoidal state) of the gap 4 causes distortion of the symmetrical ultrasonic wave, as shown in FIG5 , while maintaining minimal distortion and more efficient demodulation. This changes the difficulty of the sound wave escaping from the gap 4, thereby demodulating the symmetrical sound wave into audible sound.

[0048] In this embodiment, the inner diameter of the support body 31 is smaller than the inner diameter of the sound hole 32, and the outer diameter of the sound hole 32 is equal to the outer diameter of the support body 31. The demodulation structure 2 body completely covers the ultrasonic sound-emitting unit 1 and covers a part of the support body 31. The positive projection of the gap 4 to the support body 31 along the sound-emitting direction is completely located on the support body 31. In this way, the demodulation structure 2 is placed directly above the ultrasonic sound-emitting unit 1, and the overall assembly is convenient. Of course, the demodulation structure 2 can also be placed on the side of the ultrasonic sound-emitting unit 1. As long as the symmetrical ultrasonic wave that eventually comes out can be demodulated through a variable gap 4, no corresponding limitation is made. By preventing the demodulation structure 2 directly above from moving, the sound wave propagates laterally and encounters the vibrating demodulation structure 2. The resonant frequency is consistent with the sound wave carrier frequency, causing it to vibrate and change the size of the gap 4, thereby modulating audible sound.

[0049] In this embodiment, the fixing portion 22 includes a first fixing portion 221 and a second fixing portion 222 fixed at opposite sides of the sound hole 32 , and a cavity 6 enclosed by the first fixing portion 221 and the second fixing portion 222 .

[0050] The detuning structure 2 includes a first detuning structure 23 and a second detuning structure 24. One end of the first detuning structure 23 is fixed to one end of the first fixing portion 221, and the other end of the first detuning structure 23 is separated from one end of the second fixing portion 222 to form the gap 4. One end of the second detuning structure 24 is fixed to the other end of the first fixing portion 221, and the other end of the second detuning structure 24 is separated from the other end of the second fixing portion 222 to form the gap 4. The gap 4 between the first fixing portion 221 and the cavity 6 changes as the first fixing portion 221 vibrates with the detuning structure 2.

[0051] In this embodiment, the first fixing portion 221 and the second fixing portion 222 are symmetrically arranged to increase the range of change of the gap 4.

[0052] In this embodiment, the two ends of the first detuning structure 23 are respectively fixed to one end of the first fixing portion 221 and one end of the second fixing portion 222, and the two ends of the second detuning structure 24 are respectively fixed to the other end of the first fixing portion 221 and the other end of the second fixing portion 222. The first detuning structure 23 includes two first detuning bodies 231 arranged opposite to each other and a first stopper 232 respectively arranged between the two first detuning bodies 231, with the first stopper 232 and the two first detuning bodies 231 forming two gaps 4. The second detuning structure 24 includes two second detuning bodies 241 arranged opposite to each other and a second stopper 242 respectively arranged between the two second detuning bodies 241, with the second stopper 242 and the two second detuning bodies 241 forming two gaps 4.

[0053] In this embodiment, the first demodulation structures 23 include two and are arranged opposite to each other, and the second demodulation structures 24 include two and are arranged opposite to each other. One end of each of the two first demodulation structures 23 is fixed to one end of the first fixed part 221 and one end of the second fixed part 222 respectively; one end of each of the two second demodulation structures 24 is fixed to the other end of the first fixed part 221 and the other end of the second fixed part 222 respectively; the other ends of the two first demodulation structures 23 are spaced apart to form a gap 4, and the other ends of the two second demodulation structures 24 are spaced apart to form a gap 4.

[0054] Optionally, the fixing portion 22 may be a cantilever beam structure, which has a good supporting and fixing effect.

[0055] In this embodiment, the direction of the opening between the two first demodulation structures 23 is opposite to the direction of the opening between the two second demodulation structures 24 .

[0056] In this embodiment, the support structure 3 is a cylindrical structure.

[0057] In an optional embodiment of the present invention, a speaker device 100 is provided. The speaker device 100 includes: a supporting structure 3 , an ultrasonic sound generating unit 1 and a demodulation structure 2 .

[0058] The support structure 3 includes a support body provided with a sound cavity 5 and a sound hole extending from one end of the support body to the other end thereof.

[0059] The ultrasonic sound generating unit 1 is located in the sound generating cavity 5 and fixed to the inner circumference of the supporting body, and is used for emitting amplitude-modulated ultrasonic waves.

[0060] The demodulation structure 2 is located in the sound hole and fixed to the support structure 3. The demodulation structure 2 and the ultrasonic sound generating unit 1 are spaced apart along the sound hole.

[0061] The demodulation structure 2 includes a diaphragm 21 and a fixed part 22 extending from the support structure 3 to match the diaphragm 21, and a gap formed by the diaphragm 21 and the support structure 3. The amplitude-modulated ultrasonic wave emitted by the ultrasonic sound-generating unit 1 drives the demodulation structure 2 to vibrate, and the resulting change in the gap can demodulate the modulated sound wave.

[0062] In this embodiment, the sound inlet and outlet axis of the slit of the demodulation structure 2 is at right angles to the vibration direction of the ultrasonic sound generating unit 1 .

[0063] Compared to the prior art, the speaker device of the present invention is configured such that an ultrasonic sound-generating unit is fixed to the inner circumference of a support body to emit amplitude-modulated ultrasonic waves. A demodulation structure is located at one end of the sound hole and fixed to the support structure. The demodulation structure and the ultrasonic sound-generating unit are spaced apart along the sound-generating direction of the ultrasonic sound-generating unit. The demodulation structure includes a diaphragm and a fixed portion extending from the support structure to match the diaphragm, and a gap formed between the diaphragm and the support structure. The amplitude-modulated ultrasonic waves emitted by the ultrasonic sound-generating unit drive the demodulation structure to vibrate, and the resulting change in the gap can demodulate the modulated sound waves. In this way, the ultrasonic sound-generating unit emits symmetrical ultrasonic waves, and the ultrasonic sound pressure acts on the vibrating demodulation structure, causing the demodulation structure to vibrate, changing the size of the gap formed between the demodulation structure and the sound hole, thereby changing the difficulty of the sound waves flowing out of the gap, and thus demodulating the symmetrical sound waves into audible sound. This results in high sound wave demodulation efficiency, good vibration system amplitude enhancement effect, and excellent acoustic performance.

[0064] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A speaker device, characterized in that The speaker device comprises: A support structure, comprising a support body provided with a sound cavity and a sound hole extending from one end of the support body to the other end thereof; an ultrasonic sound-generating unit, located in the sound-generating cavity and fixed to the inner circumference of the supporting body, for emitting amplitude-modulated ultrasonic waves; a demodulation structure, the demodulation structure being located at one end of the sound hole and fixed to the support structure, the demodulation structure and the ultrasonic sound generating unit being spaced apart along the sound generating direction of the ultrasonic sound generating unit; The demodulation structure includes a diaphragm and a fixed part extending from the supporting structure to match the diaphragm, and a gap formed between the diaphragm and the supporting structure. The amplitude-modulated ultrasonic waves emitted by the ultrasonic sound-emitting unit drive the demodulation structure to vibrate, and the resulting change in the gap can demodulate the modulated sound wave.

2. The speaker device according to claim 1, wherein The ultrasonic sound generating unit generates out-of-plane vibration under the drive of the characteristic modulation signal and emits amplitude-modulated ultrasonic waves.

3. The speaker device according to claim 1, wherein The diaphragm of the demodulation structure vibrates under the action of the amplitude-modulated ultrasonic wave, and the mechanical resonance frequency of the diaphragm is equivalent to the carrier frequency of the amplitude-modulated ultrasonic wave.

4. The speaker device according to claim 1, wherein The vibration of the diaphragm causes a change in the geometric dimensions of the structure of the gap in at least one direction, causing the acoustic impedance of the gap to change periodically.

5. The speaker device according to claim 1, wherein The amplitude-modulated ultrasonic wave passes through the changed gap and becomes an asymmetric amplitude-modulated ultrasonic wave, which contains the demodulated modulated sound wave.

6. A speaker device, characterized in that: The speaker device comprises: A support structure, comprising a support body provided with a sound cavity and a sound hole extending from one end of the support body to the other end thereof; an ultrasonic sound-generating unit, located in the sound-generating cavity and fixed to the inner circumference of the supporting body, for emitting amplitude-modulated ultrasonic waves; a demodulation structure, the demodulation structure being located in the sound hole and fixed to the support structure, the demodulation structure and the ultrasonic sound generating unit being spaced apart along the sound hole; The demodulation structure includes a diaphragm and a fixed part extending from the supporting structure to match the diaphragm, and a gap formed by the diaphragm and the supporting structure. The amplitude-modulated ultrasonic wave emitted by the ultrasonic sound-emitting unit drives the demodulation structure to vibrate, and the resulting change in the gap can demodulate the modulated sound wave.

7. The speaker device according to claim 6, wherein The sound inlet and outlet axis of the slit of the demodulation structure is at right angles to the vibration direction of the ultrasonic sound-generating unit.

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