Vibration plate for speaker and speaker

Abstract

The present invention discloses a diaphragm for a speaker and a speaker. The diaphragm is made of a single-layer foamed polyester material, and the foamed polyester material is formed into a structure with a dense surface and multiple closed pores inside. The density range of the foamed polyester material is 0.2 g / cm<supgt;3< / supgt> - 1.2 g / cm<supgt;3< / supgt>. The diaphragm is formed into an integrally molded convex structure. The diaphragm includes a first arched portion and a second arched portion arranged in a ring around the first arched portion. The first arched portion is connected to the second arched portion, and the outer periphery of the second arched portion is connected to the housing of the speaker. According to the diaphragm of the present invention, by using a single-layer foamed polyester material to form an integrally molded convex structure, the foamed polyester material has a high specific modulus, enabling the speaker to exhibit better acoustic performance in the medium and high frequencies. Moreover, the integrally molded convex structure can not only simplify the assembly process of the diaphragm but also have good consistency during the vibration process, thereby greatly improving the sound production effect of the speaker.

Description

Technical Field

[0001] The present invention relates to the technical field of loudspeakers, and in particular to a vibration plate used for a loudspeaker and a loudspeaker. Background Art

[0002] Speakers are an important acoustic component in portable electronic devices. They are mainly used to convert sound wave signals into sound signals to achieve the effect of sound. The vibration plate is an important component in the speaker. It plays a vital role in the sound performance of the speaker. It determines the quality of the speaker's conversion from electrical energy to sound energy.

[0003] In the related art, in order to improve the mid- and high-frequency performance of the speaker, the vibration plate is mostly made of a material with greater rigidity. However, the material density corresponding to the material with greater rigidity will also be greater, which will increase the weight of the vibration plate, and in turn affect the frequency response sensitivity of the speaker and its sound quality. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a vibration plate for a loudspeaker, which has the advantages of high sensitivity and good mid- and high-frequency performance.

[0005] The invention also provides a loudspeaker having the vibration plate.

[0006] According to the first embodiment of the present invention, the vibration plate for the speaker is made of a single-layer foamed polyester material, the foamed polyester material is formed into a structure with a dense surface and a plurality of closed cells inside, and the density of the foamed polyester material is in the range of 0.2 g / cm 3 -1.2g / cm 3 The vibration plate is formed as an integrally formed convex structure, and the vibration plate includes a first arched portion and a second arched portion arranged in a ring shape around the first arched portion, the first arched portion is connected to the second arched portion, and the outer periphery of the second arched portion is connected to the outer shell of the speaker.

[0007] According to the first aspect of the present invention, the vibration plate for the speaker is made of a single-layer foamed polyester material to form an integrally formed convex hull structure. The foamed polyester material has a high specific modulus, which enables the speaker to exhibit better acoustic performance in the mid- and high-frequency aspects. The vibration plate is set as an integrally formed convex hull structure, which can simplify the assembly process of the vibration plate and improve production efficiency. In addition, the material consistency of the vibration plate is good, so that the vibration system of the speaker has good consistency during the vibration process, thereby greatly improving the sound quality of the speaker.

[0008] According to some embodiments of the present invention, a horizontally arranged platform portion is provided between the first arched portion and the second arched portion, and the platform portion is used for bonding and connecting with the voice coil.

[0009] According to some embodiments of the present invention, a pattern is provided on an outer surface of at least one of the first arched portion and the second arched portion.

[0010] According to some embodiments of the present invention, the specific modulus of the foamed polyester material is ≥750 MPa / g / cm 3 .

[0011] According to some embodiments of the present invention, the diameter d of the pores satisfies: 2um≤d≤30um.

[0012] According to some embodiments of the present invention, a thickness L of the foamed polyester material satisfies: 0.02 mm ≤ L ≤ 0.3 mm.

[0013] According to some embodiments of the present invention, the room temperature loss factor of the foamed polyester material is in the range of ≥0.01.

[0014] According to some embodiments of the present invention, the elongation at break of the foamed polyester material is in the range of ≥100%.

[0015] According to some embodiments of the present invention, the foamed polyester material comprises foamed polyethylene terephthalate (PET).

[0016] According to some embodiments of the present invention, the foamed polyester material includes any one of foamed polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyarylate (PAR) and polycarbonate (PC).

[0017] A loudspeaker according to an embodiment of the second aspect of the present invention comprises the vibration plate for a loudspeaker according to the above embodiment of the present invention.

[0018] According to the speaker of the second embodiment of the present invention, according to the speaker of the second embodiment of the present invention, by setting the above-mentioned vibration, the vibration plate is made of a single-layer foamed polyester material to form an integrally molded convex structure, which can not only improve the assembly efficiency of the speaker, but also improve the sound effect of the speaker.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic diagram of the overall structure of a vibration plate according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A partial enlarged view of the circled part in the middle;

[0023] Figure 3 4 is a schematic diagram comparing the frequency response curves of a vibration plate according to an embodiment of the present invention and a common vibration.

[0024] Reference numerals:

[0025] Vibration plate 100,

[0026] A first arched portion 1, a second arched portion 2, a platform portion 3, and a bubble 4. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] Reference below Figure 1-Figure 3 A vibration plate 100 for a speaker according to an embodiment of the present invention is described.

[0029] The vibration plate 100 for a loudspeaker according to the first embodiment of the present invention is made of a single-layer foamed polyester material. The foamed polyester material has the characteristics of low density and high overall rigidity, so that the foamed polyester material has a higher specific modulus. Figure 3 As shown, the vibration plate 100 with the same mass, made of foamed polyester material, has a larger thickness, so that the high-frequency cutoff frequency of the speaker is shifted to the high frequency, making the high-frequency response range of the speaker wider, so that the speaker exhibits better acoustic performance in the mid- and high-frequency aspects.

[0030] like Figure 3 As shown, the foamed polyester material can be formed into a structure with a dense surface and multiple closed cells 4 inside. The multiple cell structures can reduce the weight of the vibration plate 100 while also providing it with good mechanical strength, thereby improving the durability and reliability of the vibration plate 100.

[0031] Among them, the density range of foamed polyester material is 0.2g / cm 3 -1.2g / cm 3 It is understood that when the density of the foamed polyester material is less than 0.2 g / cm 3When the density of the foamed polyester material is greater than 1.2g / cm 3 When the density of the foamed polyester material is 0.2 g / cm 3 -1.2g / cm 3 When the weight of the vibration plate 100 is moderate, the mid-frequency response of the speaker is more sensitive and the pronunciation effect is better. Further, the density range of the foamed polyester material can be further 0.2g / cm 3 -0.6g / cm 3 .

[0032] like Figure 1 As shown, the vibration plate 100 is formed into an integrally formed convex hull structure, and the vibration plate 100 may include a first arched portion 1 and a second arched portion 2 arranged in a ring shape around the first arched portion 1, the first arched portion 1 is connected to the second arched portion 2, and the outer periphery of the second arched portion 2 is connected to the housing of the speaker. Specifically, the first arched portion 1 and the second arched portion 2 are roughly formed into an arch shape, and the second arched portion 2 is arranged on the circumferential outer side of the first arched portion 1 and connected to the first arched portion 1, wherein the vibration system of the speaker may include the vibration plate 100 and the voice coil, and after the voice coil is energized and receives the alternating current signal, it will be subjected to the magnetic field force of the magnetic circuit system, and under the action of the magnetic field force, it will reciprocate and cut the magnetic flux lines, thereby driving the vibration plate 100 to vibrate, thereby instigating the air to make sounds. At this time, the first arched portion 1 can be used as the dome top of the vibration system, which mainly improves the mid- and high-frequency performance of the sound. The second arched portion 2 can be used as the folding ring portion of the vibration system, and there is no need to additionally bond engineering plastic diaphragms (such as PEek, PAR, etc.), elastomeric materials (such as TPU, TPEE, silicone rubber, etc.), adhesive films (such as acrylic adhesives, silicone adhesives, etc.), etc. to achieve this. While improving the low-frequency performance of the sound, it can also significantly improve the anti-fatigue performance of the vibration plate and inhibit the occurrence of polarization.

[0033] Therefore, through the above-mentioned setting, the vibration plate 100 is set as an integrally formed convex structure, which can simplify the assembly process of the vibration plate 100 and improve production efficiency. In addition, the material consistency of the vibration plate 100 is good, so that the vibration system of the speaker has good consistency during the vibration process, reducing the occurrence of polarization during the vibration process, thereby greatly improving the sound effect of the speaker.

[0034] Optionally, the inner diameter D of the first arched portion 1 1 Size range: 0.4cm≤D 1 ≤2cm. Further, the inner diameter D of the first arched portion 1 1The size range further meets: 0.4cm≤D 1 ≤1cm. Optionally, the height H of the first arched portion 1 1 The size range meets: 0.06mm≤H 1 ≤10mm, further, the height H of the first arched portion 1 1 The size range further meets: 0.08mm≤H 1 ≤8mm.

[0035] Optionally, the inner diameter D of the second arched portion 2 2 Size range: 0.02mm≤D 2 ≤3mm. Further, the inner diameter D of the second arched portion 2 2 The size range further meets: 0.05mm≤D 2 ≤2mm. Optionally, the height H of the second arched portion 2 2 The size range meets: 0.06mm≤H 2 ≤5mm, further, the height H of the second arched portion 2 2 The size range further meets: 0.08mm≤H 2 ≤3mm.

[0036] In a specific example of the present invention, the vibration plate 100 can be formed into an integrally formed convex hull structure by means of pneumatic molding. Among them, the molding process may include: preheating of the material strip, pressure differential molding and cooling and demolding. First, the material strip made of foamed polyester material is heated to a set temperature, and then the material strip is placed in the mold, the upper mold of the mold is pressurized, and the pressure difference between the upper mold and the lower mold of the mold is used to press the material strip into the structure set by the vibration plate 100, and finally the mold is cooled, and the molded convex hull structure can be obtained after opening the mold. The process of pneumatic molding is relatively simple and has high production efficiency. Moreover, since the temperature and pressure at various locations in the mold cavity are consistent, the state of the product at various locations of the formed vibration plate 100 is also better, which can improve the product quality of the vibration plate 100.

[0037] According to the first embodiment of the present invention, the vibration plate 100 for the speaker is made of a single-layer foamed polyester material to form an integrally formed convex hull structure. The foamed polyester material has a high specific modulus, so that the speaker exhibits better acoustic performance in the mid- and high-frequency aspects. The vibration plate 100 is set as an integrally formed convex hull structure, which can simplify the assembly process of the vibration plate 100 and improve production efficiency. In addition, the material consistency of the vibration plate 100 is good, so that the vibration system of the speaker has good consistency during the vibration process, thereby greatly improving the sound effect of the speaker.

[0038] According to some embodiments of the invention, a horizontally extending platform portion 3 may be provided between the first arch portion 1 and the second arch portion 2, and both ends of the platform portion 3 are respectively connected to the first arch portion 1 and the second arch portion 2, and the platform portion 3 is used to be bonded to the voice coil. Therefore, through the above arrangement, the platform portion 3 extends horizontally, thereby facilitating the assembly of the vibration plate 100 and the voice coil, and also improving the assembly firmness between the vibration plate 100 and the voice coil.

[0039] According to some embodiments of the present invention, a pattern may be provided on at least one of the outer surfaces of the first arched portion 1 and the second arched portion 2 (not shown). That is, a pattern may be provided on the outer surface of the first arched portion 1, a pattern may be provided on the outer surface of the second arched portion 2, or a pattern may be provided on the outer surfaces of both the first arched portion 1 and the second arched portion 2. By providing a pattern on the outer surface of the first arched portion 1 and / or the second arched portion 2, the rigidity of the vibration plate 100 may be improved, thereby improving the sensitivity of the mid-frequency response of the speaker.

[0040] According to some embodiments of the present invention, the specific modulus of the foamed polyester material is ≥750 MPa / g / cm 3 It is understood that when the specific modulus of the foamed polyester material is less than 750 MPa / g / cm 3 When the specific modulus of the foamed polyester material is too low, the high-frequency cutoff frequency of the speaker will move to the left, narrowing the high-frequency response range of the speaker, thereby affecting the pronunciation effect of the speaker. When the specific modulus of the foamed polyester material is ≥750MPa / g / cm 3 When the high frequency response range of the speaker is increased, the sound effect of the speaker can be improved. Optionally, the specific modulus of the foamed polyester material can be 1000 MPa / g / cm 3 .

[0041] In some embodiments of the present invention, the diameter d of the pores 4 may satisfy: 2um≤d≤30um. Specifically, when the diameter d of the pores 4 is too small, the overall weight of the vibration plate 100 is reduced less, and when the diameter d of the pores 4 is too large, the structural strength of the foamed polyester material is affected. When 2um≤d≤30um, the vibration plate 100 made of the foamed polyester material has a better sounding effect. Furthermore, the diameter d of the pores 4 may further satisfy: 5um≤d≤15um.

[0042] According to some embodiments of the present invention, the thickness L of the foamed polyester material may satisfy: 0.02mm≤L≤0.3mm. It is understandable that when the thickness of the foamed polyester material is less than 0.02mm, the thickness of the foamed polyester material is too thin, resulting in insufficient rigidity of the vibration plate 100, and the vibration plate 100 is prone to polarization during vibration. When the thickness of the foamed polyester material is greater than 0.3mm, the thickness of the foamed polyester material is too thick, which will cause the vibration space margin of the vibration plate 100 to become smaller, and the increase in vibration thickness will also increase the overall mass of the vibration system, thereby losing part of the sensitivity of the vibration plate 100 and affecting the sound effect of the speaker. When the thickness L of the foamed polyester material satisfies 0.02mm≤L≤0.3mm, the vibration plate 100 can not only meet the rigidity requirements, but also meet the sensitivity requirements of the vibration plate 100, which meets the production requirements of the speaker. Optionally, the thickness L of the foamed polyester material may further satisfy: 0.06mm≤L≤0.18mm.

[0043] According to some embodiments of the present invention, the room temperature loss factor of the foamed polyester material is in the range of ≥0.01. It is understandable that the higher the room temperature loss factor of the foamed polyester material, the stronger the ability of the vibration system to suppress polarization during vibration, the better the vibration consistency of the vibration system, and thus the sound effect of the speaker is improved. Optionally, the room temperature loss factor of the foamed polyester material can be 0.5.

[0044] According to some embodiments of the present invention, the elongation at break of the foamed polyester material may be in a range of ≥100%. It is understandable that the better the flexibility of the material, the greater its elongation at break, and the stronger the material's ability to resist damage. Therefore, when the elongation at break of the foamed polyester material is ≥100%, the flexibility of the foamed polyester material can be improved, and the problem of easy film breakage of the foamed polyester material during molding can be effectively solved.

[0045] According to some embodiments of the present invention, the foamed polyester material may include foamed polyethylene terephthalate (PET), which is commonly known as polyester resin, and is prepared by ester exchange of dimethyl terephthalate with ethylene glycol or esterification of terephthalic acid with ethylene glycol to synthesize dihydroxyethyl terephthalate, and then polycondensation. Polyethylene terephthalate (PET) has high rigidity and low density, which greatly improves the specific modulus of the foamed polyester material, thereby significantly improving the mid- and high-frequency acoustic performance of the vibration plate.

[0046] According to some other embodiments of the present invention, the foamed polyester material may further include any one of foamed polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyarylate (PAR) and polycarbonate (PC).

[0047] Reference below Figure 1-Figure 3 The vibration plate 100 for a loudspeaker of the present invention is described in detail with a specific embodiment. It is worth noting that the following description is only exemplary and not a specific limitation of the present invention.

[0048] like Figure 1 As shown, according to the vibration plate 100 of the embodiment of the present invention, the vibration plate 100 is formed into an integrally formed convex hull structure, and the vibration plate 100 includes a first arched portion 1 and a second arched portion 2 arranged in a ring shape around the first arched portion 1, the outer periphery of the second arched portion 2 is connected to the outer shell of the speaker, and a horizontally extending platform portion 3 is provided between the first arched portion 1 and the second arched portion 2, and the two ends of the platform portion 3 are respectively connected to the first arched portion 1 and the second arched portion 2, and the platform portion 3 is used to be bonded to the voice coil. Among them, the first arched portion 1 is used as the dome top of the vibration system of the speaker, which is mainly used to improve the mid-high frequency performance of the sound. The second arched portion 2 is used as the folded ring portion of the vibration system of the speaker, which is mainly used to improve the low-frequency performance of the sound. The inner diameter D of the first arched portion 1 1 is 1 cm, and the height H of the first arched portion 1 1 The inner diameter D of the second arched portion 2 is 8 mm. 2 is 2 mm, and the height H of the second arched portion 2 is 2 is 1mm.

[0049] The vibration plate 100 is made of a single-layer foamed polyethylene terephthalate (PET) material, and the thickness L of the foamed polyester material is 0.08 mm. The density of the foamed polyester material is 0.4 g / cm 3 , the specific modulus of the foamed polyester material is 1000MPa / g / cm 3 , the room temperature loss factor of the foamed polyester material is ≥0.01, and the elongation at break of the foamed polyester material is ≥100%. Figure 3 As shown, the foamed polyester material is formed into a structure with a dense surface and a plurality of closed cells 4 inside, and the diameter d of the cells 4 can satisfy: d=10 um.

[0050] The vibration plate 100 is formed into an integrally formed convex hull structure by means of pneumatic molding. Among them, its molding process includes: preheating of the material strip, pressure differential molding and cooling and demolding. First, the material strip made of foamed polyester material is heated to a set temperature, and then the material strip is placed in the mold, the upper mold of the mold is pressurized, and the pressure difference between the upper mold and the lower mold of the mold is used to press the material strip into the structure set by the vibration plate 100, and finally the mold is cooled, and the molded convex hull structure can be obtained after opening the mold. The process of pneumatic molding is relatively simple and has high production efficiency. Moreover, since the temperature and pressure at various locations in the mold cavity are consistent, the state of the product at various locations of the vibration plate 100 after molding is also better.

[0051] According to the vibration plate 100 of the embodiment of the present invention, since it is made of foamed polyester material, the foamed polyester material has the characteristics of low density, high rigidity, and high specific modulus, so that the mid-frequency response of the speaker is more sensitive. Under the condition of the same weight, the vibration plate 100 made of foamed polyester material has a larger thickness, so that the high-frequency cutoff frequency of the speaker is shifted to the high frequency, so that the high-frequency response range of the speaker is wider. Moreover, the vibration plate 100 is a convex hull structure made in an integrated manner, which not only improves production efficiency, but also because the consistency of the foamed material is good, the vibration system will reduce the sound of polarization phenomenon during the vibration process, which is manifested as a lower THD, thereby improving the sound effect of the speaker.

[0052] The loudspeaker according to the second aspect of the present invention comprises the vibration plate 100 for the loudspeaker according to the above embodiment of the present invention.

[0053] According to the speaker of the second invention embodiment of the present invention, by setting the above-mentioned vibration plate 100, the vibration plate 100 is made of a single-layer foamed polyester material to form an integrally formed convex hull structure, which can not only improve the assembly efficiency of the speaker, but also improve the sound effect of the speaker.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vibration plate for a loudspeaker, It is characterized in that The vibration plate is made of a single-layer foamed polyester material, the foamed polyester material is formed into a structure with a dense surface and a plurality of closed cells inside, and the density of the foamed polyester material is in the range of 0.2 g / cm 3 -1.2g / cm 3 The specific modulus of the foamed polyester material is ≥750MPa / g / cm 3 The room temperature loss factor range of the foamed polyester material is ≥0.01, the vibration plate is formed as an integrally formed convex structure, the vibration plate includes a first arched portion and a second arched portion arranged in a ring shape around the first arched portion, the first arched portion is connected to the second arched portion, and the outer periphery of the second arched portion is connected to the housing of the speaker.

2. The diaphragm for a speaker according to claim 1, It is characterized in that A horizontally extending platform portion is provided between the first arched portion and the second arched portion, and the platform portion is used for bonding and connecting with the voice coil.

3. The diaphragm for a speaker according to claim 1, It is characterized in that A pattern is provided on an outer surface of at least one of the first arched portion and the second arched portion.

4. The diaphragm for a speaker according to claim 1, It is characterized in that The diameter d of the pores satisfies: 2um≤d≤30um.

5. The diaphragm for a speaker according to claim 1, It is characterized in that The thickness L of the foamed polyester material satisfies: 0.02 mm≤L≤0.3 mm.

6. The diaphragm for a speaker according to claim 1, It is characterized in that The elongation at break of the foamed polyester material is in the range of ≥100%.

7. The diaphragm for a loudspeaker according to any one of claims 1 to 6, It is characterized in that The foamed polyester material includes foamed polyethylene terephthalate (PET).

8. The diaphragm for a speaker according to any one of claims 1 to 6, It is characterized in that The foamed polyester material includes any one of foamed polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyarylate (PAR) and polycarbonate (PC).

9. A loudspeaker, It is characterized in that The present invention comprises a vibration plate for a loudspeaker according to any one of claims 1 to 8.

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