阅读说明：本技术 一种扬声器振膜和扬声器 (Loudspeaker diaphragm and loudspeaker ) 是由 范雷达 庞健 于 2021-07-16 设计创作，主要内容包括：本发明涉及声电器件技术领域,具体而言,涉及一种扬声器振膜和扬声器。所述扬声器振膜包括向上凸起的封闭折环部,以及所述折环部围成的中心部；所述中心部具有平面结构或向上的凸起结构,所述中心部和所述折环部的制备原料不同；其中,所述折环部包括至少一层聚醚酮酮材料；所述聚醚酮酮材料的制备原料包括对苯二甲酰氯和间苯二甲酰氯；所述对苯二甲酰氯和所述间苯二甲酰氯的摩尔比为5～100:5～100。该扬声器振膜具有加工温度低,Tg点高,耐温性能好,具有较大的使用温度范围,拉伸性能优异等优点,有利于节能降耗,环境适应能力强,能够改善扬声器的低频性能,并且不容易发生破膜。(The invention relates to the technical field of acoustoelectric devices, in particular to a loudspeaker diaphragm and a loudspeaker. The loudspeaker diaphragm comprises a closed folded ring part protruding upwards and a central part surrounded by the folded ring part; the central part is provided with a plane structure or an upward convex structure, and the preparation raw materials of the central part and the folded ring part are different; wherein the folded ring part comprises at least one layer of polyether ketone material; the preparation raw materials of the polyether ketone material comprise terephthaloyl chloride and isophthaloyl chloride; the molar ratio of the terephthaloyl chloride to the isophthaloyl chloride is 5-100: 5-100. The loudspeaker diaphragm has the advantages of low processing temperature, high Tg point, good temperature resistance, large use temperature range, excellent tensile property and the like, is beneficial to energy conservation and consumption reduction, has strong environment adaptability, can improve the low-frequency performance of a loudspeaker, and is not easy to break.)

1. A loudspeaker diaphragm is characterized by comprising a closed folded ring part protruding upwards and a central part surrounded by the folded ring part; the central part is provided with a plane structure or an upward convex structure, and the preparation raw materials of the central part and the folded ring part are different;

wherein the folded ring part comprises at least one layer of polyether ketone material;

the preparation raw materials of the polyether ketone material comprise terephthaloyl chloride and isophthaloyl chloride;

the molar ratio of the terephthaloyl chloride to the isophthaloyl chloride is 5-100: 5-100.

2. The loudspeaker diaphragm of claim 1, wherein the molar ratio of the terephthaloyl chloride to the isophthaloyl chloride is 60-80: 20-40.

3. The loudspeaker diaphragm of claim 1 where the raw materials for preparing the polyetherketoneketone material further include a reinforcing agent and a filler.

4. The loudspeaker diaphragm of claim 3 where the stiffening agent includes at least one of glass fiber, carbon nanotubes, and graphene.

5. The loudspeaker diaphragm of claim 1 where the Tg point of the polyetherketoneketone material is >160 ℃, more preferably 161-163 ℃.

6. The loudspeaker diaphragm of claim 1 where the polyetherketoneketone material has a density of 1.0 to 1.5g/cm³More preferably 1.2 to 1.35g/cm³。

7. The loudspeaker diaphragm of claim 1 where the polyetherketoneketone material has a processing temperature of less than 385 ℃, more preferably 350 to 380 ℃.

8. The loudspeaker diaphragm of claim 1, wherein the polyether ketone material has a tensile modulus >3.5GPa, more preferably > 3.9 GPa;

preferably, the tensile strength of the polyetherketoneketone material is more than or equal to 106MPa, and more preferably more than or equal to 110 MPa.

9. The loudspeaker diaphragm of any one of claims 1 to 8, wherein the bending ring portion includes at least one polyetherketoneketone material layer and at least one substrate layer;

preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least one substrate layer and at least one glue layer;

preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least one substrate layer and at least two glue layers;

preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least two substrate layers and at least one glue layer;

preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least two substrate layers and at least two adhesive layers;

preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least two substrate layers and at least three glue layers.

10. A loudspeaker comprising the loudspeaker diaphragm of any one of claims 1 to 9.

Technical Field

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

Background

The miniature acoustic generator has the advantages of small volume, portability and the like, so that the miniature acoustic generator is widely applied to portable electronic equipment such as hearing aids, mobile phones, notebook computers and the like. With the rapid development of these portable electronic devices, people have increasingly strong requirements for the functionality of the portable electronic devices, and thus, the miniature sound generators applied to the portable electronic devices are also rapidly developed.

Patent No. CN104796843A discloses PEEK material as the base material of the diaphragm. However, the polyetheretherketone material has the disadvantages of high processing temperature, low Tg point (glass transition temperature), poor tensile properties, etc., which is not favorable for the miniaturization and high-power development of speakers.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The first purpose of the invention is to provide a loudspeaker diaphragm, which has the advantages of low processing temperature, high Tg point, good temperature resistance, larger use temperature range, excellent tensile property and the like by adopting a polyether ketone material with excellent performance, thereby being beneficial to energy conservation and consumption reduction, having strong environment adaptability, being capable of improving the low-frequency performance of the loudspeaker, and being not easy to break the diaphragm.

A second object of the present invention is to provide a speaker, which has a wide temperature range of use, is highly adaptive to the environment, can improve the low frequency performance of the speaker, and is not prone to rupture.

In order to achieve the above purpose of the present invention, the following technical solutions are adopted:

a loudspeaker diaphragm comprises a closed folded ring part protruding upwards and a central part surrounded by the folded ring part; the central part is provided with a plane structure or an upward convex structure, and the preparation raw materials of the central part and the folded ring part are different;

wherein the folded ring part comprises at least one layer of polyether ketone material;

the preparation raw materials of the polyether ketone material comprise terephthaloyl chloride and isophthaloyl chloride;

the molar ratio of the terephthaloyl chloride to the isophthaloyl chloride is 5-100: 5-100.

The loudspeaker diaphragm provided by the invention has the advantages of low processing temperature, high Tg (glass transition temperature) point, good temperature resistance, larger use temperature range, excellent tensile property and the like, has strong environment adaptability, is beneficial to energy conservation and consumption reduction, can improve the low-frequency performance of a loudspeaker, and is not easy to break.

The vibrating diaphragm includes central part and centers on the book ring portion that the central part set up, wherein, the central part is responsible for the high pitch performance of vibrating diaphragm, rolls over the bass performance that the ring portion is responsible for the vibrating diaphragm.

Preferably, the central portion and the edge portion are integrally formed.

Preferably, the molar ratio of the terephthaloyl chloride to the isophthaloyl chloride is 100:5, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80 or 5: 100.

More preferably, the molar ratio of the terephthaloyl chloride to the isophthaloyl chloride is 60-80: 20-40. Alternatively 80:20, 70:30 or 60: 40.

For the above molar ratios, 80:20 crystallization rate is fast, 70:30 crystallization rate is moderate, 60:40 crystallization rate is slow, and the modulus and tensile strength of PEKK increase with increasing isophthaloyl dichloride content.

By adjusting the molar ratio of terephthaloyl chloride to isophthaloyl chloride, the crystallization rate of PEKK can be adjusted.

Preferably, the raw materials for preparing the polyether ketone material also comprise a reinforcing agent and a filler.

The reinforcing agent and the filler can improve the tensile strength and the tensile modulus of the polyether ketone material.

Preferably, the reinforcing agent includes at least one of glass fiber, carbon nanotube and graphene, and more preferably, both of the glass fiber and the carbon fiber are mixed.

Wherein the addition amount of the reinforcing agent is 30-50% of the sum of the mass of the terephthaloyl chloride and the isophthaloyl chloride.

Preferably, the filler includes at least one of talc, mica, quartz, wollastonite, kaolin, silicic acid, magnesium carbonate, magnesium hydroxide, chalk, ground calcium carbonate, light calcium carbonate, lime, feldspar, barium sulfate, a foaming agent, zinc oxide, zinc sulfide, titanium dioxide, iron oxide, iron manganese oxide, a permanent magnet alloy, a metal powder, inorganic hollow microspheres, molybdenum oxide, boron nitride, boron carbide, aluminum nitride, and calcium fluoride.

Preferably, the Tg point of the polyether ketone material is more than 160 ℃, and more preferably 161-163 ℃.

Preferably, the density of the polyether ketone material is 1.0-1.5 g/cm³More preferably 1.2 to 1.35g/cm³。

Preferably, the processing temperature of the polyether ketone material is less than 385 ℃, and more preferably 350-380 ℃.

Preferably, the polyetherketoneketone material has a tensile modulus >3.5GPa, more preferably ≥ 3.9 GPa.

Preferably, the tensile strength of the polyetherketoneketone material is more than or equal to 106MPa, and more preferably more than or equal to 110 MPa.

The polyether ketone material has specific Tg point, density, processing temperature, tensile modulus and tensile strength, so that the bass performance of the vibrating diaphragm can be improved, meanwhile, the temperature resistance of the vibrating diaphragm can be improved, the environment adaptability of the vibrating diaphragm is higher, the tensile performance of the vibrating diaphragm is higher, and the vibrating diaphragm prepared from the polyether ketone material is not prone to rupture.

Preferably, the hinge part comprises at least one polyetherketoneketone material layer and at least one substrate layer.

Preferably, the material adopted by the base material layer comprises thermoplastic polyurethane elastomer TPU, dynamic vulcanized rubber polyurethane elastomer TPSIV, thermoplastic dynamic vulcanized rubber polyester polyether elastomer, thermoplastic dynamic vulcanized rubber polyether nylon elastomer, polyether ether ketone PEEK, polyether ketone PEKK, thermoplastic copolyester elastomer TPC, thermoplastic polyamide elastomer TPA, polyphenylene sulfone PPSU, polyarylate PAR, polyetherimide PEI, polyimide PI, polyphenylene sulfide PPS, polyethylene naphthalate PEN, polyethylene terephthalate PET, thermoplastic dynamic vulcanized rubber polyether nylon elastomer, blend TPV- (EPDM + PP) of ethylene propylene diene monomer and polypropylene, blend TPV- (NBR + PP) of nitrile rubber and polypropylene, blend TPV- (NR + PP) of natural rubber and polypropylene, blend TPV- (ENR + PP) of epoxidized natural rubber and polypropylene, A blend TPV- (IIR + PP) of butyl rubber and polypropylene, a thermoplastic polyamide elastomer TPA-EE containing ether bonds and ester bond soft segments, a thermoplastic polyamide elastomer TPA-ES containing polyester soft segments, a thermoplastic polyamide elastomer TPA-ET containing polyether soft segments, a thermoplastic polystyrene elastomer TPS, at least one of a styrene-butadiene-styrene block copolymer TPS-SBS, a polystyrene-poly (ethylene-butylene) -polystyrene block copolymer TPS-SEBS, a polystyrene-poly (ethylene-propylene) -polystyrene block copolymer TPS-SEPS, a styrene-isoprene-styrene block copolymer TPS-SIS, a blend of nitrile rubber and polyvinyl chloride TPZ- (NBR + PVC) and a thermoplastic polyolefin elastomer TPO.

Preferably, the hinge part comprises at least two polyetherketoneketone material layers and at least one substrate layer.

Preferably, the hinge part comprises at least one polyetherketoneketone material layer and at least two substrate layers.

Preferably, the hinge part comprises at least two polyetherketoneketone material layers and at least two substrate material layers.

Preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least one substrate layer and at least one glue layer.

Preferably, the adhesive used for the adhesive layer comprises at least one of a silica gel adhesive, an acrylic adhesive, a polyurethane adhesive and a rubber adhesive; more preferably a silicone adhesive and a polyurethane adhesive.

Preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least one substrate layer and at least two glue layers.

Preferably, the hinge part comprises at least two polyetherketoneketone material layers, at least one substrate layer and at least two adhesive layers.

Preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least two substrate layers and at least one glue layer.

Preferably, the hinge part comprises at least two polyetherketoneketone material layers, at least two substrate layers and at least one glue layer.

Preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least two substrate layers and at least two adhesive layers.

Preferably, the hinge part comprises at least two polyetherketoneketone material layers, at least two substrate layers and at least two adhesive layers.

Preferably, the hinge part comprises at least three layers of polyether ketone material layers, at least two layers of substrate layers and at least two layers of adhesive layers.

Preferably, the hinge part comprises at least one polyetherketoneketone material layer, at least two substrate layers and at least three glue layers.

Preferably, the hinge part comprises at least two polyetherketoneketone material layers, at least two substrate layers and at least three glue layers.

Preferably, the hinge part comprises at least three layers of polyether ketone material layers, at least two layers of substrate layers and at least three layers of adhesive layers.

The layer structure of the loop part also influences the performance of the diaphragm. The layer structure is favorable for further improving the performance of the vibrating diaphragm.

The invention also provides a loudspeaker comprising the loudspeaker diaphragm.

The loudspeaker has the advantages of large use temperature range, strong environment adaptability, excellent low-frequency performance, difficult occurrence of membrane rupture and the like.

Compared with the prior art, the invention has the beneficial effects that:

(1) the loudspeaker diaphragm provided by the invention has low processing temperature, and is beneficial to energy conservation and consumption reduction; the Tg point is high, the temperature resistance is good, the application temperature range is wide, and the environmental adaptability is strong; the tensile property is excellent; the excellent combination of the properties can improve the low-frequency performance of the loudspeaker, and the diaphragm is not easy to break.

(2) The loudspeaker provided by the invention has the advantages of large use temperature range, strong environment adaptability, excellent low-frequency performance, difficult occurrence of membrane rupture and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a cross-sectional view of a diaphragm structure provided by the present invention;

fig. 2 is a schematic structural view of a corrugated portion according to embodiment 2 of the present invention;

fig. 3 is a schematic structural view of a hinge portion provided in embodiment 3 of the present invention;

fig. 4 is a schematic structural view of a hinge portion provided in embodiment 4 of the present invention;

fig. 5 is a schematic structural view of a hinge portion provided in embodiment 5 of the present invention;

fig. 6 is a schematic structural view of a hinge portion provided in embodiment 6 of the present invention;

fig. 7 is a schematic structural view of a hinge portion provided in embodiment 7 of the present invention;

fig. 8 is a schematic structural view of a hinge portion provided in embodiment 8 of the present invention;

fig. 9 is a schematic structural view of a corrugated portion according to embodiment 9 of the present invention;

fig. 10 is a schematic structural view of a corrugated portion according to embodiment 10 of the present invention;

fig. 11 is a comparison graph of sound pressure test results of the diaphragms provided in the test example of the present invention.

Detailed Description

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope 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 examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Fig. 1 is a cross-sectional view of a diaphragm structure provided by the present invention. As can be seen from fig. 1, the loudspeaker diaphragm includes a closed loop portion protruding upward, and a central portion surrounded by the loop portion; the central portion has a planar configuration or an upwardly convex configuration. Wherein the center part is responsible for the high pitch performance, and the corrugated part is responsible for the low pitch performance. The invention focuses on the improvement of the material of the folded ring part and the layered structure, namely, the bass performance of the vibrating diaphragm is improved. Because PEKK temperature resistant height, the modulus is big, and under the same condition, the vibrating diaphragm can be thinner, and the response speed of speaker can be faster like this, and is more accurate to the analysis of sound.

The polyether ketone material used for the corrugated rim part in the loudspeaker diaphragm of the following embodiment of the invention comprises the following preparation raw materials: terephthaloyl chloride, isophthaloyl chloride, carbon fibers, and glass fibers. Wherein the molar ratio of the terephthaloyl chloride to the isophthaloyl chloride is 70: 30; the total adding amount of the carbon fiber and the glass fiber is 40 percent of the sum of the mass of the terephthaloyl chloride and the isophthaloyl chloride.

Example 1

The folded ring portion in the loudspeaker diaphragm provided by this embodiment is a single-layer structure, and the single-layer structure is made of a polyetherketoneketone material.

The polyetherketoneketone material of example 1 was subjected to the following property measurements:

extruder temperature 350 ℃ and 380 ℃ (ISO 527-1 BA); elongation of 6% -10% (ISO 527-1 BA); tensile modulus 3.8-4.0GPa (ISO 527-1 BA); tensile strength (X/Y, i.e., transverse and longitudinal) of 80-100MPa, tensile strength (Z, i.e., vertical XY direction) of 48-65 MPa; tg point 160-165 ℃; density 1.29g/cm³。

Example 2

The corrugated portion in the loudspeaker diaphragm provided by this embodiment is a two-layer composite structure, and the composite structure is composed of a layer of polyetherketoneketone material layer and a layer of substrate layer. The structure of the folded ring part is shown in fig. 2.

Wherein, the material adopted by the substrate layer is dynamic vulcanized rubber polyurethane elastomer TPSIV.

Example 3

The corrugated portion in the loudspeaker diaphragm that this embodiment provided is the composite construction of three-layer, and this composite construction comprises a layer of polyetherketoneketone material layer, a layer of substrate layer and a layer of glue film. The structure of the folding ring part is shown in figure 3, the adhesive layer is a middle layer, and the polyether ketone material layer and the base material layer are respectively a top layer and a bottom layer.

Wherein, the material adopted by the substrate layer is thermoplastic polyamide elastomer TPA.

The adhesive used by the adhesive layer is polyurethane adhesive.

Example 4

The ring bending part in the loudspeaker diaphragm provided by the embodiment is a four-layer composite structure, and the composite structure is composed of a polyether ketone material layer, a base material layer and two glue layers. The structure of the folding ring part is shown in figure 4, two adhesive layers are middle layers, and the polyether ketone material layer and the base material layer are respectively a top layer and a bottom layer.

The base material layer is made of thermoplastic polyurethane elastomer (TPU).

The adhesive used by the adhesive layer is polyurethane adhesive.

Example 5

The ring bending part in the loudspeaker diaphragm provided by the embodiment is a four-layer composite structure, and the composite structure is composed of a polyether ketone material layer, two substrate layers and an adhesive layer. The structure of the folding ring part is shown in fig. 5, the polyether ketone material layer and the adhesive layer are middle layers, and the two substrate layers are respectively a top layer and a bottom layer.

Wherein, the two substrate layers are made of thermoplastic dynamic vulcanized rubber polyester polyether elastomer.

The adhesive used in the adhesive layer is a silica gel adhesive.

Example 6

The ring bending part in the loudspeaker diaphragm provided by the embodiment is a four-layer composite structure, and the composite structure is composed of a polyether ketone material layer, two substrate layers and an adhesive layer. The structure of the folding ring part is shown in fig. 6, one adhesive layer and one substrate layer are intermediate layers, and the other substrate layer and the polyether ketone material layer are respectively a bottom layer and a top layer.

Wherein, the two substrate layers are made of thermoplastic dynamic vulcanized rubber polyether nylon elastomer and thermoplastic dynamic vulcanized rubber polyester polyether elastomer (bottom layer).

The adhesive used in the adhesive layer is acrylic adhesive.

Example 7

The corrugated rim portion in the loudspeaker diaphragm that this embodiment provided is five-layer composite construction, and this composite construction comprises one deck polyetherketoneketone material layer, two-layer substrate layer and two-layer glue film. The structure of the ring folding part is shown in fig. 7, two layers of glue layers and one layer of base material layer are intermediate layers (the second layer of glue layer is positioned between the first layer of glue layer and the first layer of base material layer), and the other layer of base material layer (the second base material layer) and the polyether ketone material layer are respectively a bottom layer and a top layer.

Wherein, the two substrate layers are made of thermoplastic copolyester elastic TPC.

The adhesive used in the adhesive layer is acrylic adhesive.

Example 8

The corrugated rim portion in the loudspeaker diaphragm that this embodiment provided is five-layer composite construction, and this composite construction comprises one deck polyetherketoneketone material layer, two-layer substrate layer and two-layer glue film. The structure of the edge portion is as shown in fig. 8, two glue layers and one substrate layer are intermediate layers (the first substrate layer is located between the first glue layer and the second glue layer), and the other substrate layer (the second substrate layer) and the polyetherketoneketone material layer are respectively a bottom layer and a top layer.

Wherein, the two base material layers are respectively made of thermoplastic polyamide elastomer TPA-EE containing ether bonds and ester bond soft segments and thermoplastic polyamide elastomer TPA-ES containing polyester soft segments (a second base material layer).

The adhesive used in the adhesive layer is rubber adhesive.

Example 9

The ring bending part in the loudspeaker diaphragm provided by the embodiment is a six-layer composite structure, and the composite structure is composed of a polyether ketone material layer, two substrate layers and three adhesive layers. The structure of the folding ring part is shown in fig. 9, three layers of glue layers and one layer of base material layer are middle layers (three layers of glue layers are connected), and the other layer of base material and the other layer of polyether ketone material layer are respectively a bottom layer and a top layer.

Wherein, the materials adopted by the two substrate layers are thermoplastic polyolefin elastomer TPO respectively.

The adhesive used in the adhesive layer is rubber adhesive.

Example 10

The ring bending part in the loudspeaker diaphragm provided by the embodiment is a six-layer composite structure, and the composite structure is composed of a polyether ketone material layer, two substrate layers and three adhesive layers. The structure of the edge portion is as shown in fig. 10, the three layers of glue layers and the one layer of base material layer are intermediate layers (the base material layer is located between the first layer of glue layer and the second layer of base material layer, the second layer of glue layer is connected with the third layer of glue layer), and the other layer of base material layer and the polyether ketone material layer are respectively a bottom layer and a top layer.

Wherein, the two substrate layers are made of thermoplastic copolyester elastic TPC.

The adhesive used by the adhesive layer is polyurethane adhesive.

Comparative example 1

The diaphragm portion of the loudspeaker diaphragm provided in this comparative example is a single-layer structure, and the single-layer structure is made of a polyether ether ketone (PEEK) material.

The measurement of the performance parameters of the polyether ether ketone (PEEK) material was carried out, and the results were as follows: extruder temperature 375-; 5% -10% elongation (ISO 527-1 BA); tensile modulus 3.5-3.7GPa (ISO 527-1 BA); the tensile strength (X/Y) is 80-105MPa, and the tensile strength (Z) is 15-19 MPa; tg point 140-143 ℃; density 1.3g/cm³。

The performance of the polyether ketone PEKK material in the comparative example and the performance of the polyether ether ketone PEEK material in the comparative example 1 are compared, so that the processing temperature of the polyether ketone PEKK material provided by the application is lower, and the energy conservation and consumption reduction are facilitated; moreover, the Tg point is obviously improved, which shows that the polyether ketone PEKK material has good temperature resistance, a large use temperature range and strong environment adaptability; in addition, the tensile rate, the tensile modulus and the tensile strength of the polyether ketone PEKK material are higher than those of the polyether ether ketone PEEK material, and the embodiment shows that the polyether ketone PEKK material has excellent tensile property. Therefore, the polyether ketone PEKK material with excellent comprehensive performance is used for the loudspeaker diaphragm, so that the bass performance of the loudspeaker can be improved, and the phenomenon of diaphragm rupture is reduced.

Meanwhile, the tensile rate of the PEKK in the Z-axis direction is larger than that of the PEEK, and the tensile strength is also large, so that the diaphragm can be thinner in the process of forming the diaphragm, and the diaphragm of the loudspeaker is lighter and thinner under the same F0 (the cut-off frequency and the resonance frequency of the loudspeaker), so that the loudspeaker can obtain higher response speed and higher sensitivity; similarly, the PEKK material can obtain a higher sound pressure value with the same thickness.

Test example 1

Sound pressure tests were performed on the diaphragms prepared in example 1 and comparative example 1, and the test results are shown in fig. 11.

As can be seen from fig. 11, the results obtained by hot-melt compounding PEEK and PEKK materials of the same thickness with a polyurethane material of the same thickness clearly show that the sound pressure of the PEKK material in example 1 is higher overall than that of the PEEK material in comparative example 1, and therefore, the loudspeaker prepared in example 1 has a higher loudness.

While particular embodiments of the present invention have been illustrated and described, it will be appreciated that the above embodiments are merely illustrative of the technical solution of the present invention and are not restrictive; those of ordinary skill in the art will understand that: modifications may be made to the above-described embodiments, or equivalents may be substituted for some or all of the features thereof without departing from the spirit and scope of the present invention; 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; it is therefore intended to cover in the appended claims all such alternatives and modifications that are within the scope of the invention.