阅读说明：本技术 振膜以及扬声器 (Vibrating diaphragm and loudspeaker ) 是由 罗鹏 韩坤 赵蓓滴 于 2019-09-17 设计创作，主要内容包括：本发明涉及扬声器技术领域,公开了一种振膜以及扬声器。该振膜包括球顶部和围绕球顶部的折环部。球顶部为包括弹性层和承载层在内的至少两层结构,弹性层设于承载层上。折环部为包括第一顺性层、第一阻尼层和第二顺性层在内的至少三层结构,第一顺性层、第一阻尼层和第二顺性层依次层叠设置。通过上述方式,本发明能够提高振膜的声学性能。(The invention relates to the technical field of loudspeakers and discloses a vibrating diaphragm and a loudspeaker. The diaphragm includes a ball top and a flexure surrounding the ball top. The top of the ball is of at least two-layer structure including an elastic layer and a bearing layer, and the elastic layer is arranged on the bearing layer. The ring-folding part is of at least three-layer structure comprising a first compliance layer, a first damping layer and a second compliance layer, and the first compliance layer, the first damping layer and the second compliance layer are sequentially stacked. Through the mode, the acoustic performance of the diaphragm can be improved.)

1. A diaphragm, comprising:

a ball top and a collared portion surrounding the ball top;

the top of the ball is of at least two-layer structure including an elastic layer and a bearing layer, and the elastic layer is arranged on the bearing layer;

the folded ring part is of at least three-layer structure comprising a first compliance layer, a first damping layer and a second compliance layer, and the first compliance layer, the first damping layer and the second compliance layer are sequentially stacked.

2. The diaphragm of claim 1, wherein the first compliant layer, the first damping layer, and the second compliant layer of the loop portion are hollowed out to form a hollowed-out area, the elastic layer and the carrier layer at the top of the ball are disposed corresponding to the hollowed-out area, and edges of the elastic layer and the carrier layer are attached to edges of the hollowed-out area.

3. The diaphragm of claim 1, wherein the first compliant layer, the first damping layer, and the second compliant layer of the flexure extend to the dome, and the elastic layer and the carrier layer of the dome are stacked with the first compliant layer, the first damping layer, and the second compliant layer extending to the dome.

4. The diaphragm of claim 1, wherein the first compliant layer, the first damping layer, and the second compliant layer of the flexure extend to the dome, and the resilient layer and the carrier layer of the dome extend to the flexure;

the elastic layer, the bearing layer, the first compliant layer, the first damping layer and the second compliant layer are arranged in a stacked manner in the ball top part and the folded ring part.

5. The diaphragm according to any one of claims 1 to 4, wherein a ratio of compliance values of the flexure portion and the dome portion is 10000:1 to 40000: 1.

6. The diaphragm of claim 5, wherein the ratio of the first resonant frequency of the bending portion to the divided vibration frequency of the top of the ball is 0.005:1 to 0.01: 1.

7. The diaphragm of any one of claims 1 to 4, wherein the damping value of the bending portion is 0.02-0.2 kg/s.

8. The diaphragm of any one of claims 1 to 4,

the elastic layer is made of diamond;

the material of the bearing layer is at least one of polyether-ether-ketone, polyarylate, polyetherimide, polyimide, polyphenylene sulfide, polyethylene naphthalate and polyethylene terephthalate;

the first compliance layer and the second compliance layer are made of at least one of thermoplastic polyurethane elastomer rubber, thermoplastic elastomer and thermoplastic polyester elastomer;

the first damping layer is made of acrylic.

9. The diaphragm of claim 1, wherein the loop portion further includes a third compliant layer and a second damping layer, and the first compliant layer, the first damping layer, the second compliant layer, the second damping layer and the third compliant layer are sequentially stacked.

10. A loudspeaker, characterized in that the loudspeaker comprises a diaphragm according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of loudspeakers, in particular to a vibrating diaphragm and a loudspeaker.

Background

The working principle of the moving-coil loudspeaker is that the electrified conductor is stressed in a magnetic field, and the changed current passes through the coil to generate a changed magnetic field, so that the vibrating diaphragm of the loudspeaker vibrates to generate sound. The diaphragm of the conventional moving-coil speaker is difficult to balance three parameters of compliance, elasticity and damping of the diaphragm, so that the acoustic performance of the conventional moving-coil speaker is poor.

Disclosure of Invention

In view of the above, the present invention provides a diaphragm and a speaker, which can improve the acoustic performance of the diaphragm.

In order to solve the technical problems, the invention adopts a technical scheme that: a diaphragm is provided. The diaphragm includes a ball top and a flexure surrounding the ball top. The top of the ball is of at least two-layer structure including an elastic layer and a bearing layer, and the elastic layer is arranged on the bearing layer. The ring-folding part is of at least three-layer structure comprising a first compliance layer, a first damping layer and a second compliance layer, and the first compliance layer, the first damping layer and the second compliance layer are sequentially stacked.

In an embodiment of the invention, the first compliant layer, the first damping layer and the second compliant layer of the folded ring portion are hollowed in the middle to form a hollowed area, the elastic layer and the bearing layer at the top of the ball are disposed corresponding to the hollowed area, and the edges of the elastic layer and the bearing layer are attached to the edge of the hollowed area.

In an embodiment of the invention, the first compliant layer, the first damping layer and the second compliant layer of the folded ring portion extend to the top of the ball, and the elastic layer and the bearing layer of the top of the ball are stacked with the first compliant layer, the first damping layer and the second compliant layer extending to the top of the ball.

In an embodiment of the present invention, the first compliant layer, the first damping layer and the second compliant layer of the folded ring portion extend to the top of the ball, and the elastic layer and the bearing layer of the top of the ball extend to the folded ring portion; in the top of the ball and the folded ring, an elastic layer, a bearing layer, a first compliance layer, a first damping layer and a second compliance layer are arranged in a stacking mode.

In an embodiment of the present invention, the ratio of the compliance value of the folded ring part to the ball top part is 10000:1 to 40000: 1.

In an embodiment of the present invention, a ratio of the first resonant frequency of the loop part to the divided vibration frequency of the ball top part is 0.005:1 to 0.01: 1.

In an embodiment of the present invention, the damping value of the hinge portion is 0.02-0.2 kg/s.

In an embodiment of the present invention, the elastic layer is made of diamond; the material of the bearing layer is at least one of polyether-ether-ketone, polyarylate, polyetherimide, polyimide, polyphenylene sulfide, polyethylene naphthalate and polyethylene terephthalate; the first compliance layer and the second compliance layer are made of at least one of thermoplastic polyurethane elastomer rubber, thermoplastic elastomer and thermoplastic polyester elastomer; the first damping layer is made of acrylic.

In an embodiment of the invention, the edge portion further includes a third compliant layer and a second damping layer, and the first compliant layer, the first damping layer, the second compliant layer, the second damping layer and the third compliant layer are sequentially stacked.

In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a loudspeaker comprising a diaphragm as set forth in the above embodiments.

The invention has the beneficial effects that: different from the prior art, the invention provides a diaphragm and a loudspeaker. The diaphragm includes a ball top and a flexure surrounding the ball top. The top of the ball is of at least two-layer structure including an elastic layer and a bearing layer, and the folded ring part is of at least three-layer structure including a first compliance layer, a first damping layer and a second compliance layer. Therefore, the three parameters of the compliance, the elasticity and the damping of the diaphragm are balanced through the elastic layer, the first compliance layer, the first damping layer and the second compliance layer. And multilayer structure's ball top and dog-ear portion can provide great adjustment space, more are favorable to adjusting to compliance, elasticity and the damping of vibrating diaphragm, and then can improve the acoustic performance of vibrating diaphragm.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. Moreover, the drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.

FIG. 1 is a schematic structural diagram of a diaphragm according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of one embodiment of the present invention for dividing the frequency of vibration;

FIG. 3 is a schematic diagram of another embodiment of the present invention for dividing the frequency of vibration;

FIG. 4 is a schematic structural diagram of a diaphragm according to a second embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a diaphragm according to a third embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an embodiment of the hinge portion of the present invention;

fig. 7 is a schematic structural diagram of an embodiment of the loudspeaker of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In order to solve the technical problem of poor acoustic performance of a moving-coil speaker in the prior art, an embodiment of the present invention provides a diaphragm. The diaphragm includes a ball top and a flexure surrounding the ball top. The top of the ball is of at least two-layer structure including an elastic layer and a bearing layer, and the elastic layer is arranged on the bearing layer. The ring-folding part is of at least three-layer structure comprising a first compliance layer, a first damping layer and a second compliance layer, and the first compliance layer, the first damping layer and the second compliance layer are sequentially stacked. As described in detail below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a diaphragm according to a first embodiment of the present invention.

In an embodiment the diaphragm comprises a spherical top 1 and a corrugated portion 2 surrounding the spherical top 1. Wherein the ball top 1 determines the acoustic performance of the diaphragm in the mid-high frequency range. The ball top 1 is required to have a large elasticity, i.e., a large modulus of elasticity, and colloquially, a large rigidity. And the corrugated portion 2 determines the acoustic performance of the diaphragm in the low frequency band. The bending part 2 is required to have larger compliance (compliance and elasticity are reciprocal), so that the ball top 1 and the bending part 2 have reasonable compliance value ratio, and the vibrating diaphragm has good acoustic performance in middle and high frequency bands and low frequency bands. Meanwhile, the bending ring part 2 also provides reasonable damping, so that the vibrating diaphragm has a reasonable frequency response curve and can provide good hearing for a user.

In view of this, the dome section 1 has at least a two-layer structure including an elastic layer 11 and a support layer 12, and the elastic layer 11 is provided on the support layer 12. The elastic layer 11 provides a sufficiently large elasticity to meet the requirements on the elasticity of the ball top 1. The loop part 2 is of at least three-layer structure comprising a first compliance layer 21, a first damping layer 22 and a second compliance layer 23, and the first compliance layer 21, the first damping layer 22 and the second compliance layer 23 are sequentially stacked. The first compliant layer 21 and the second compliant layer 23 provide a compliance large enough to meet the compliance requirements for the loop 2 being folded in half. Moreover, the first damping layer 22 of the edge portion 2 can provide reasonable damping. And the dome portion 1 and the corrugated portion 2 of the multilayer structure can provide a larger adjusting space, so that the adjustment of the compliance, elasticity and damping of the diaphragm is facilitated, and the compliance, elasticity and damping of the diaphragm can be flexibly adjusted according to the requirements of actual products on the performance of the diaphragm.

It can be seen from the above that, the compliance, elasticity and damping parameters of the diaphragm are balanced by the elastic layer, the first compliance layer, the first damping layer and the second compliance layer. And multilayer structure's ball top and dog-ear portion can provide great adjustment space, more are favorable to adjusting to compliance, elasticity and the damping of vibrating diaphragm, and then can improve the acoustic performance of vibrating diaphragm.

Please continue to refer to fig. 1. In an embodiment, the first compliant layer 21, the first damping layer 22 and the second compliant layer 23 are only disposed on the corrugated portion 2 of the diaphragm, and the elastic layer 11 and the bearing layer 12 are only disposed on the dome portion 1 of the diaphragm, so that the diaphragm has reasonable compliance, elasticity and damping.

Specifically, the first compliant layer 21, the first damping layer 22 and the second compliant layer 23 of the edge folding portion 2 are hollowed out to form a hollowed-out area 24, the elastic layer 11 and the bearing layer 12 of the ball top portion 1 are arranged corresponding to the hollowed-out area 24, and the edges of the elastic layer 11 and the bearing layer 12 are attached to the edge of the hollowed-out area 24.

The elastic layer 11 and the carrier layer 12 may be located on a side of the first compliant layer 21 away from the second compliant layer 23, or on a side of the second compliant layer 23 away from the first compliant layer 21. Also, the elastic layer 11 may be located on either side of the carrier layer 12 in a direction perpendicular to the width of the diaphragm.

The resilient layer 11 is preferably made of a highly elastic material, such as diamond material or the like. The carrier layer 12 is a carrier of a high elastic material for forming the elastic layer 11, and is preferably made of at least one of polyether Ether Ketone (PEEK), Polyarylate (PAR), Polyetherimide (PEI), Polyimide (Polyimide, PI), Polyphenylene Sulfide (PPS), polyethylene naphthalate, and polyethylene terephthalate. The elastic layer 11 is formed by electroplating or the like of a highly elastic material for forming the elastic layer 11 on the support layer 12.

The first and second compliant layers 21, 23 are preferably made of a high compliance material, such as at least one of Thermoplastic polyurethane Elastomer rubber (TPU), Thermoplastic Elastomer (TPE), and Thermoplastic Polyester Elastomer (TPEE). The materials of the first compliant layer 21 and the second compliant layer 23 may be the same or different.

The material of the first damping layer 22 is preferably acrylic or the like. Wherein the first damping layer 22 has viscosity, and the first damping layer 22 also serves as an adhesive between the first compliant layer 21 and the second compliant layer 23 while providing reasonable damping, so as to adhere the first compliant layer 21 and the second compliant layer 23 together. First damping layer 22 is different from traditional glue film PU (Polyurethane), and the tow sides of first damping layer 22 all possess viscidity, therefore the equal adhesion rete in its tow sides realizes the multilayer composite construction of vibrating diaphragm to provide sufficient adjustment space, be favorable to adjusting to the performance of vibrating diaphragm, and then can improve the acoustic performance of vibrating diaphragm. PU usually can only form a film layer on one side, so that the adjustment space provided by PU is limited, which is not favorable for adjusting the performance of the diaphragm.

In this embodiment, the ratio of compliance values of the corrugated portion 2 and the dome portion 1 is preferably 10000:1 to 40000:1, so that the dome portion 1 and the corrugated portion 2 have a reasonable ratio of compliance values, and the diaphragm has good acoustic performance in both the middle and low frequency bands. And when the ratio of the compliance value of the folded ring part 2 to the compliance value of the ball top part 1 is 10000: 1-40000: 1, the mass of the vibrating diaphragm is constant, the ratio of the first resonant frequency of the folded ring part 2 to the dividing vibration frequency of the ball top part 1 is 0.005: 1-0.01: 1, and the dividing vibration of the vibrating diaphragm can be effectively inhibited.

The first resonance frequency is defined as the frequency of the first resonance peak in the frequency response curve of the diaphragm, which extends from the low frequency to the high frequency. The divided vibration frequency is defined as extending from low frequency to high frequency, if there is no other resonance peak after a resonance peak, or the subsequent resonance peak value of the resonance peak is lower than the resonance peak value by more than 15dB, the frequency of the resonance peak is defined as the divided vibration frequency. As shown in fig. 2-3, fig. 2 shows a case where the formant at the divided vibration frequency is divided and then there is no other formant, and fig. 3 shows a case where the formant at the divided vibration frequency and the subsequent formant peak values thereof are all lower by 15dB or more than the formant peak value at the divided vibration frequency.

Wherein, the calculation formula of the first resonance frequency and the division vibration frequency is defined as:

m is the sum of the masses of the diaphragm and a voice coil (not shown) on the diaphragm, and P is the compliance value of the film.

Specifically, in the present embodiment, the material of the elastic layer 11 is diamond, and the thickness thereof is 1 μm; the material of the bearing layer 12 is polyetheretherketone PEEK, and the thickness thereof is 6 μm. Thus, the compliance value of the ball top 1 of the diaphragm is 1e-6 m/N.

Considering that the ratio of the compliance value of the folded ring part 2 to the compliance value of the top part 1 of the ball is 10000:1 to 40000:1, and the ratio of the first resonant frequency of the folded ring part 2 to the divided vibration frequency of the top part 1 of the ball is 0.005:1 to 0.01:1, the damping value of the folded ring part 2 in the embodiment is preferably 0.02-0.2kg/s to provide reasonable damping for the diaphragm, so that the diaphragm has a reasonable frequency response curve and can provide good hearing feeling for users.

In this embodiment, the first compliant layer 21 and the second compliant layer 23 are made of thermoplastic polyurethane elastomer (TPU), and the thicknesses of the first compliant layer 21 and the second compliant layer 23 are 12 μm respectively; the first damping layer 22 is made of acrylic and has a thickness of 10 μm. Thus, the compliance value of the bending part 2 of the diaphragm is 2e-2 m/N.

It can be seen that the compliance ratio of the edge portion 2 to the dome portion 1 is 20000:1, which is in the range of 10000:1 to 40000: 1. And the mass sum m of the meter diaphragm and the voice coil on the diaphragm is 3e-5kg, the first resonant frequency of the bending ring part 2 is 205.47Hz, and the divided vibration frequency of the ball top part 1 is 29057.6 Hz. The ratio of the first resonance frequency of the loop portion 2 to the divided vibration frequency of the ball top portion 1 is 0.00707, which is between 0.005:1 and 0.01: 1. Wherein the damping value provided by the first damping layer 22 of the corrugated rim part 2 is 0.05 kg/s.

Through the above manner, the diaphragm of the embodiment has good acoustic performance in both the middle and high frequency bands and the low frequency band. Meanwhile, the bending ring part 2 also provides reasonable damping, so that the vibrating diaphragm has a reasonable frequency response curve and can provide good hearing for a user.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a diaphragm according to a second embodiment of the present invention.

In an embodiment the diaphragm comprises a spherical top 1 and a corrugated portion 2 surrounding the spherical top 1. The ball top 1 has at least two layers including an elastic layer 11 and a bearing layer 12, and the elastic layer 11 is arranged on the bearing layer 12. The loop part 2 is of at least three-layer structure comprising a first compliance layer 21, a first damping layer 22 and a second compliance layer 23, and the first compliance layer 21, the first damping layer 22 and the second compliance layer 23 are sequentially stacked.

The present embodiment is different from the above embodiments in that the first compliant layer 21, the first damping layer 22, and the second compliant layer 23 of the edge portion 2 extend to the ball top portion 1, and the elastic layer 11 and the carrier layer 12 of the ball top portion 1 are stacked with the first compliant layer 21, the first damping layer 22, and the second compliant layer 23 extending to the ball top portion 1, that is, the first compliant layer 21, the first damping layer 22, and the second compliant layer 23 are disposed corresponding to the breadth of the whole diaphragm. That is, the edge portion 2 in this embodiment is a three-layer structure formed by combining the first compliant layer 21, the first damping layer 22 and the second compliant layer 23, and the ball top portion 1 is a five-layer structure formed by combining the elastic layer 11, the load-bearing layer 12, the first compliant layer 21, the first damping layer 22 and the second compliant layer 23. The first compliant layer 21, the first damping layer 22 and the second compliant layer 23 extend to the dome 1, so that the compliance and damping of the dome 1 can be improved.

It should be noted that the diaphragms in the above embodiments all exhibit high elasticity of the dome portion 1, and the corrugated portion 2 has high compliance and damping, specifically, the elasticity value of the dome portion 1 is greater than the elasticity value of the corrugated portion 2, and the compliance value and the damping value of the dome portion 1 are less than the compliance value and the damping value of the corrugated portion 2. A diaphragm different from the diaphragm described in the previous embodiment will be described below.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a diaphragm according to a third embodiment of the present invention.

In an embodiment the diaphragm comprises a spherical top 1 and a corrugated portion 2 surrounding the spherical top 1. The ball top 1 has at least two layers including an elastic layer 11 and a bearing layer 12, and the elastic layer 11 is arranged on the bearing layer 12. The loop part 2 is of at least three-layer structure comprising a first compliance layer 21, a first damping layer 22 and a second compliance layer 23, and the first compliance layer 21, the first damping layer 22 and the second compliance layer 23 are sequentially stacked.

The present embodiment differs from the above embodiments in that the first compliant layer 21, the first damping layer 22 and the second compliant layer 23 of the edge portion 2 extend to the ball-top portion 1, and the elastic layer 11 and the load-bearing layer 12 of the ball-top portion 1 extend to the edge portion 2. In the top 1 and the edge 2 of the ball, the elastic layer 11, the carrier layer 12, the first compliant layer 21, the first damping layer 22 and the second compliant layer 23 are stacked, that is, the elastic layer 11, the carrier layer 12, the first compliant layer 21, the first damping layer 22 and the second compliant layer 23 are all arranged corresponding to the breadth of the whole diaphragm. That is, the ball top portion 1 and the edge portion 2 in this embodiment are both five-layer structures formed by combining the elastic layer 11, the bearing layer 12, the first compliant layer 21, the first damping layer 22 and the second compliant layer 23.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the hinge portion of the present invention.

In an embodiment, the corrugated portion 2 is not limited to a three-layer composite structure of the first compliant layer 21, the first damping layer 22 and the second compliant layer 23, and the corrugated portion 2 may further include a third compliant layer 25 and a second damping layer 26, where the first compliant layer 21, the first damping layer 22, the second compliant layer 23, the second damping layer 26 and the third compliant layer 25 are sequentially stacked. The characteristics that the front surface and the back surface of the first damping layer 22 can be adhered with the film layers are utilized, and the combination of three layers, five layers, seven layers and even more layers of the ring-folding part 2 can be realized.

Of course, in other embodiments of the present invention, the loop part 2 may include more compliant layers and damping layers, and the damping layers are used as the connection between adjacent compliant layers, so that the loop part 2 can provide a larger compliant and damping adjustment space to allow a reasonable ratio of compliance values between the loop part 2 and the dome part 1, and the loop part 2 can also provide reasonable damping, so that the diaphragm has a reasonable frequency response curve, and can provide a good hearing feeling for a user.

In summary, the diaphragm provided by the present invention balances three parameters of compliance, elasticity and damping of the diaphragm through the elastic layer, the first compliance layer, the first damping layer and the second compliance layer. And multilayer structure's ball top and dog-ear portion can provide great adjustment space, more are favorable to adjusting to compliance, elasticity and the damping of vibrating diaphragm, and then can improve the acoustic performance of vibrating diaphragm.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a speaker according to an embodiment of the present invention.

In an embodiment, the loudspeaker 3 comprises a diaphragm 31. The diaphragm 31 described in this embodiment has already been described in detail in the above embodiments, and thus is not described herein again. It should be noted that the speaker 3 described in this embodiment may be a moving-coil speaker, and the diaphragm 31 may be provided with a voice coil (not shown) and other structures for driving the diaphragm 31 to vibrate, which is not limited herein.

In addition, in the present invention, unless otherwise expressly specified or limited, the terms "connected," "stacked," and the like are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.