WO2018006552A1 - 双单体扬声器模组及其设计方法、电子设备 - Google Patents

双单体扬声器模组及其设计方法、电子设备 Download PDF

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Publication number
WO2018006552A1
WO2018006552A1 PCT/CN2016/110427 CN2016110427W WO2018006552A1 WO 2018006552 A1 WO2018006552 A1 WO 2018006552A1 CN 2016110427 W CN2016110427 W CN 2016110427W WO 2018006552 A1 WO2018006552 A1 WO 2018006552A1
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Prior art keywords
speaker
volume
unit
rear cavity
resonant frequency
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PCT/CN2016/110427
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English (en)
French (fr)
Inventor
孙小光
邵帅
贾锋超
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歌尔股份有限公司
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Publication of WO2018006552A1 publication Critical patent/WO2018006552A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the present invention relates to the field of electroacoustic products, and more particularly, to a dual-unit speaker module, a design method of a dual-unit speaker module forming a specific resonant frequency, and a dual-unit speaker module provided Group of electronic devices.
  • the speaker module With the rapid development and replacement of electronic products, the speaker module has gradually developed in a light, thin and compact direction, and has also put forward higher requirements on the sensitivity and resonance frequency (F0) of the speaker module. Therefore, the traditional A speaker module having a single speaker unit has been unable to meet the higher demands placed on sound effects, for example, obtaining higher sensitivity and lower resonance frequency.
  • the concept of a dual-unit module has been proposed. Therefore, how to achieve the desired performance of a specific performance parameter by the design of the dual-unit module has become an important research topic.
  • a dual unit speaker module comprising a module housing, a retaining wall and two identical speaker units; the module housing is configured to have two Two mounting positions corresponding to the speaker unit and a total rear cavity; the two speaker units are mounted at respective mounting positions; the retaining wall is fixedly mounted in the total rear cavity Dividing the total back cavity into a first back cavity corresponding to the first speaker unit and a second back cavity corresponding to the second speaker unit, wherein a volume of the first back cavity is greater than the first a volume of the second rear cavity, and a volume difference between the first rear cavity and the second rear cavity causes the two single speakers to sound
  • the difference between the two resonant frequencies that occur in the module is between 30 Hz and 100 Hz.
  • a difference in volume between the first rear cavity and the second rear cavity is such that a difference between two resonant frequencies occurring in the dual unit speaker module is between 50 Hz and 80 Hz.
  • the volume of the first back cavity accounts for less than or equal to 60% of the volume of the total back cavity.
  • the retaining wall is adhesively fixed in the total rear cavity.
  • the retaining wall is made of a sound absorbing material; or the retaining wall includes a plastic body and a sound absorbing material adhered to the plastic body.
  • the retaining wall extends from a bottom of the total rear cavity to a position adjacent to the two mounting positions, such that the first rear cavity and the second rear cavity are adjacent to each other.
  • One side of the two mounting positions is communicated.
  • the total rear chamber has a mirror symmetrical structure with respect to a mid-section between the two mounting positions.
  • the retaining wall is disposed parallel to the middle section.
  • a method for designing a dual unit speaker module comprising:
  • an electronic device provided with an electronic device according to the first aspect of the invention.
  • An advantageous effect of the present invention is that the dual-unit speaker module and the design method thereof of the present invention unequally divide the total rear cavity of the module casing by the retaining wall, so that the module has two resonance frequencies that are relatively close to each other. (ie, there is a double peak of impedance), so that the resonant frequency of the module can be reduced and the sensitivity of the intermediate frequency can be improved without affecting the performance of the module.
  • FIG. 1 is a schematic view showing the internal structure of an embodiment of a dual-unit speaker module according to the present invention
  • FIG. 2 is a schematic exploded view of the dual-unit speaker module shown in FIG. 1;
  • FIG. 3 is a schematic diagram showing the internal structure of a reference module corresponding to the module shown in FIG. 1;
  • Figure 4a is a sensitivity-frequency curve of the module of Figure 3;
  • Figure 4b is an impedance-frequency curve of the module of Figure 3;
  • Figure 5a is a sensitivity-frequency curve of the module of Figure 1;
  • Figure 5b is an impedance-frequency curve of the module of Figure 1;
  • FIG. 6 is a flow chart of an embodiment of a method of designing a module in accordance with the present invention.
  • FIG. 1 is a schematic structural view of an internal structure of an embodiment of a two-unit speaker module according to the present invention.
  • 2 is a schematic exploded view of the module of FIG. 1.
  • the dual unit speaker module of the present invention comprises a module housing 1, a retaining wall 3 and two identical speaker units 2a, 2b.
  • the module case 1 is provided to have a mounting position 101a corresponding to the speaker unit 2a, a mounting position 101b corresponding to the speaker unit 2b, and a total rear chamber 104.
  • the speaker unit 2a is mounted on the corresponding mounting position 101a, and the speaker unit 2b is mounted on the corresponding mounting position 101b.
  • the retaining wall 3 is fixedly mounted in the total rear cavity 104 to divide the total rear cavity 104 into a first rear cavity 104a corresponding to the first speaker unit 2a and a second rear cavity corresponding to the second speaker unit 2b.
  • 104b wherein the volume of the first rear chamber 104a is greater than the volume 104b of the second rear chamber, and the volume difference between the first rear chamber 104a and the second rear chamber 104b is such that the dual unit speaker module has two
  • the resonant frequency, and the difference between the two resonant frequencies is between 30 Hz and 100 Hz (including 30 Hz and 100 Hz), and the difference can be further limited to between 50 Hz and 80 Hz (including 50 Hz and 80 Hz), which is The frequency corresponding to the low band impedance value reaching the maximum value.
  • the resonant frequencies of the first single module and the second single module that make up the two-single speaker module are different, and the difference between the two is 30 Hz to 100 Hz, wherein the first single module is first The speaker 2a (having a separate front cavity) and the first rear cavity 104a, the second single module consists of a second speaker 2b (having a separate front cavity) and a second rear cavity 104b.
  • F s is the resonant frequency of the speaker unit forming the single module
  • Vb is the back cavity volume of the single module
  • ⁇ 0 is the air density, usually 1.21Kg/m 3
  • Sd is a single module
  • C is the speed of sound in the air, usually 344 m / s
  • Mms is the equivalent mass of the vibration system
  • Cms is the equivalent of the support system of the vibration system.
  • the relationship between the resonant frequency F 0 of the single module, the back cavity volume Vb and the resonant frequency F s of the speaker unit can be determined according to the formula (1) and the formula (2), and further in the total
  • the volumes of the first rear chamber 104a and the second rear chamber 104b can be obtained such that the difference between the two resonance frequencies of the two-unit speaker module is between 30 Hz and 100 Hz.
  • FIG. 3 shows a schematic diagram of the internal structure of the reference module.
  • the resonant frequencies of the first module and the second module of the reference module will be equal, which indicates the resonant frequency of the reference module. Will equal the resonance of the two individual modules of their own frequency.
  • the total rear cavity 104 is divided into the first rear cavity 104a and the second rear cavity 104b by the retaining wall 3, and the volume of the first rear cavity 104a is larger than that of the second rear cavity 104b.
  • the volume therefore, in the case where the speaker unit is the same, since the rear cavity volume of the first unit module of the module of the present invention is larger than the back cavity volume of the first unit module of the reference module, the former The resonant frequency will be lower than the resonant frequency of the latter.
  • the rear cavity volume of the second single module of the module of the present invention is smaller than the rear cavity volume of the second single module of the reference module, the former The resonant frequency will be higher than the resonant frequency of the latter, indicating that the module of the present invention will have two resonant frequencies, i.e., there is an impedance doublet.
  • Figure 4a is a plot of sensitivity versus frequency for the above reference module (averaged total back cavity). According to Fig. 4a, the average value of the sensitivity 1-2 KHz is 98.1 dB.
  • Figure 5a is a graph showing the sensitivity of a module of the present invention as a function of frequency. According to Fig. 5a, the average value of the sensitivity 1-2 KHz is improved to 99.5 dB, which is 1.4 dB higher.
  • Figure 4b is a plot of impedance versus frequency for the above reference module (averaged total back cavity). According to FIG. 4b, the resonant frequency of the reference module is 610 Hz.
  • Figure 5b is a plot of impedance versus frequency for a module of the present invention.
  • the resonant frequency of the module of the present invention is 530 Hz, which is reduced by 80 Hz.
  • the present invention utilizes the impedance double peak to reduce the resonant frequency of the module, and improves the intermediate frequency sensitivity of the module, and is effective by superimposing the two resonant frequencies close to each other. The performance of the module is guaranteed.
  • the present invention avoids the expansion of the cell size due to insufficient sensitivity, not only saves the internal space of the module, but also satisfies the module size. Smaller and thinner requirements.
  • the first rear cavity can be made through the retaining wall 3
  • the volume of 104a is less than or equal to 60% of the total volume of the back cavity 104.
  • the retaining wall 3 is adhesively secured in the overall rear cavity 104.
  • the above-mentioned retaining wall 3 may also be fixedly connected in the total rear cavity by means of ultrasonic welding or the like.
  • the retaining wall 3 has a sound absorbing material composition to also adjust the sound quality through the retaining wall 3.
  • the retaining wall 3 has a sound absorbing material component, and the retaining wall 3 may be made of a sound absorbing material, or the retaining wall may include a plastic body and a sound absorbing material adhered to the plastic body. The sound absorbing material.
  • the sound absorbing material is defined according to its standard as a material that has an average sound absorption coefficient of more than 0.2 for four frequencies of 250, 500, 1K, and 2K as a sound absorbing material.
  • the sound absorbing materials are mostly loose porous materials such as slag wool, foam, silica, zeolite, sound absorbing cotton and the like.
  • the sound absorption mechanism of the sound absorbing material is that the sound wave penetrates into the pores of the material, and the pores are mostly open pores which are mutually penetrated inside, and are subjected to the friction and viscous resistance of the air molecules, so that the fine fibers are mechanically vibrated, thereby converting the sound energy into heat energy.
  • the sound absorption coefficient of such a porous sound absorbing material generally increases from low frequency to high frequency, so the sound absorption effect on high frequency and intermediate frequency is better.
  • the retaining wall 3 extends from the bottom of the total rear chamber 104 upward to a position adjacent to the two mounting positions 101a, 101b, which illustrates the retaining wall 3
  • a gap is left between the surfaces of the two speaker units 2a, 2b facing the rear chamber 104 such that the first rear chamber 104a and the second rear chamber 104b communicate with one side adjacent to the two mounting positions 101a, 101b.
  • This configuration enables the two rear chambers 104a, 104b to share the orifice of the total rear chamber 104.
  • the total rear chamber has a mirror-symmetrical structure with respect to a middle section between the two mounting positions (see the virtual plane of the reference module), the middle section being introduced to limit the total The structure of the back cavity, which is an invisible virtual plane.
  • the retaining wall 3 is arranged parallel to the middle section.
  • the module housing 1 comprises a rear housing 1a and a front housing 1b, wherein the two mounting positions 2a, 2b are formed On the front case 1b, the rear case 1a and the front case 1b are fastened together to form a total rear cavity 104. After the rear case 1a and the front case 1b are fastened together, they can be fixed together by ultrasonic welding or the like. On this basis, the retaining wall 3 can be disposed on the front case 1b.
  • the present invention also provides an electronic device such as a mobile phone, a tablet computer, an MP4, etc., which is provided with a dual unit speaker module according to the present invention.
  • the invention also provides a design method of a dual-unit speaker module, which is shown in FIG. A flow chart of one embodiment of a design method.
  • the design method may include:
  • step S601 two identical speaker units are selected, which indicates that the selected two speaker units have the same resonant frequency, and then step S602 is performed.
  • Step S602 selecting a module housing that matches the speaker unit, wherein the module housing has two mounting positions corresponding to the two speaker units in one-to-one correspondence with the two speaker units, and is isolated from each other.
  • the two front chambers and one total rear chamber are then subjected to step S603.
  • step S603 according to the above formula (1) and formula (2), the resonance frequency of the two-unit speaker module is calculated as the reference resonance frequency according to the total rear cavity of the two speaker units, and then step S604 is performed.
  • Step S604 setting the first resonance frequency to be lower than the reference resonance frequency, and then performing step S605.
  • step S605 according to the resonance frequency of the speaker unit, according to the above formula (1) and formula (2), the back cavity volume corresponding to the first resonance frequency is calculated as the target volume, and then step S606 is performed.
  • step S606 the target volume is removed from the volume of the total back cavity to obtain the remaining volume, and then step S607 is performed.
  • step S607 the second resonance frequency is calculated by using the formula (1) and the formula (2) according to the resonance frequency and the remaining volume of the speaker unit, and then step S608 is performed.
  • Step S608 it is judged whether the difference between the second resonance frequency and the first resonance frequency is between 30 Hz and 100 Hz. If yes, step S609 is performed. If not, the process returns to step S604 to modify the set first resonance frequency.
  • Step S609 determining that the first resonance frequency is the target resonance frequency, and then performing step S410.
  • Step S610 installing a retaining wall in the total rear cavity to divide the total rear cavity into a first rear cavity corresponding to the first speaker unit and a second rear cavity corresponding to the second speaker unit through the retaining wall.
  • the volume of the first back cavity is equal to the target volume corresponding to the target resonance frequency.
  • the resonant frequency expected to be obtained is first set to be the first resonant frequency, if the first set resonant frequency is first satisfied.
  • the position of the retaining wall can be determined; if the first resonant frequency set first does not satisfy the condition as the target resonant frequency, then The fixed frequency is increased by a set step, for example, 5-10 Hz, to modify the set first resonant frequency until the modified first resonant frequency satisfies the condition as the target resonant frequency, so that the design is obtained.
  • the resonant frequency of the module is as close as possible to the intended target.
  • the total rear chamber has a mirror-symmetrical structure about the mid-section between the two mounting positions and the retaining wall is disposed in a direction parallel to the middle section.

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Abstract

本发明公开了一种双单体扬声器模组及其设计方法、电子设备，该模组包括模组壳体、挡墙和两个相同的扬声器单体；模组壳体被设置为具有与两个扬声器单体一一对应的两个安装位置、与两个扬声器单体一一对应且相互隔离的两个前腔、及一个总的后腔；挡墙固定安装在总的后腔中，以将总的后腔分割为分别对应两个扬声器单体的第一后腔和第二后腔，其中，第一后腔的容积大于第二后腔的容积，且第一后腔与第二后腔之间的容积差使得双单体扬声器模组出现的两个谐振频率之间的差值在30Hz至100Hz之间。本发明模组具有较高灵敏度和较低谐振频率。

Description

双单体扬声器模组及其设计方法、电子设备 技术领域
本发明涉及电声产品技术领域，更具体地，本发明涉及一种双单体扬声器模组、形成特定谐振频率的双单体扬声器模组的设计方法、及设置有该种双单体扬声器模组的电子设备。
背景技术
随着电子产品日新月异、更新换代，扬声器模组逐渐向轻、薄、小巧的方向发展，而且还对扬声器模组的灵敏度、谐振频率(F0)等性能提出了更高的要求，因此，传统的具有一个扬声器单体的扬声器模组已不能满足对声音效果提出的更高要求，例如，获得较高灵敏度和较低谐振频率。为了解决这些问题，目前提出了双单体模组的概念，因此，如何通过对双单体模组的设计使得特定性能参数达到预期目标已经成为重要的研究课题。
发明内容
本发明实施例的一个目的是提供一种能够获得较低谐振频率的双单体模组的新的技术方案。
根据本发明的第一方面，提供了一种双单体扬声器模组，其包括模组壳体、挡墙和两个相同的扬声器单体；所述模组壳体被设置为具有与两个扬声器单体一一对应的两个安装位置及一个总的后腔；所述两个扬声器单体安装在与各自对应的安装位置上；所述挡墙固定安装在所述总的后腔中，以将所述总的后腔分割为对应第一个扬声器单体的第一后腔和对应第二个扬声器单体的第二后腔，其中，所述第一后腔的容积大于所述第二后腔的容积，且所述第一后腔与所述第二后腔之间的容积差使得所述双单体扬声 器模组出现的两个谐振频率之间的差值在30Hz至100Hz之间。
可选的是，所述第一后腔与所述第二后腔之间的容积差使得所述双单体扬声器模组出现的两个谐振频率之间的差值在50Hz至80Hz之间。
可选的是，所述第一后腔的容积占所述总的后腔的容积的百分比小于或者等于60％。
可选的是，所述挡墙粘接固定在所述总的后腔中。
可选的是，所述挡墙由吸音材料制成；或者，所述挡墙包括塑制本体及粘接在所述塑制本体上的吸音材料。
可选的是，所述挡墙从所述总的后腔的底部向上延伸至邻近所述两个安装位置的位置终止，以使所述第一后腔与所述第二后腔在邻近所述两个安装位置的一侧相通。
可选的是，所述总的后腔具有关于所述两个安装位置之间的中截面镜像对称的结构。
可选的是，所述挡墙平行于所述中截面设置。
根据本发明的第二方面，提供了一种双单体扬声器模组的设计方法，其包括：
选取两个相同的扬声器单体；
选取与所述扬声器单体相匹配的模组壳体，其中，所述模组壳体具有与两个扬声器单体一一对应的两个安装位置及一个总的后腔；
按照两个扬声器单体均分所述总的后腔计算所述双单体扬声器模组的谐振频率，作为参考谐振频率；
设定第一谐振频率低于所述参考谐振频率；
根据所述扬声器单体的共振频率，计算要获得所述第一谐振频率对应的后腔容积作为目标容积；
从所述总的后腔的容积中去除所述目标容积，得到剩余容积；
根据所述扬声器单体的共振频率和所述剩余容积，计算第二谐振频率；
判断所述第二谐振频率与所述第一谐振频率之间的差值是否在30Hz至100Hz之间，如是，则确定所述第一谐振频率为目标谐振频率，如否， 则修改设定的第一谐振频率；
在所述总的后腔中安装挡墙，以通过挡墙将所述总的后腔分割为对应第一个扬声器单体的第一后腔和对应第二个扬声器单体的第二后腔，且所述第一后腔的容积等于对应所述目标谐振频率的目标容积。
根据本发明的第三方面，提供了一种电子设备，该电子设备设置有根据本发明第一方面所述的电子设备。
本发明的一个有益效果在于，本发明双单体扬声器模组及其设计方法通过挡墙对模组壳体的总的后腔进行不等分割，以使模组出现较为接近的两个谐振频率(即出现阻抗双峰)，这样，即可以在不影响模组性能的情况下降低模组的谐振频率并提高中频灵敏度。
通过以下参照附图对本发明的示例性实施例的详细描述，本发明的其它特征及其优点将会变得清楚。
附图说明
被结合在说明书中并构成说明书的一部分的附图示出了本发明的实施例，并且连同其说明一起用于解释本发明的原理。
图1为根据本发明双单体扬声器模组的一种实施方式的内部结构示意图；
图2为图1所示双单体扬声器模组的分解结构示意图；
图3为对应图1所示模组的参考模组的内部结构示意图；
图4a为图3所示模组的灵敏度-频率变化曲线；
图4b为图3所示模组的阻抗-频率变化曲线；
图5a为图1所示模组的灵敏度-频率变化曲线；
图5b为图1所示模组的阻抗-频率变化曲线；
图6为根据本发明模组的设计方法的一种实施方式的流程图。
附图标记说明：
1-模组壳体；            1a-后壳；
1b-前壳；               101a、101b-安装位置；
104-总的后腔；          104a-第一后腔；
104b-第二后腔；         2a、2b-扬声器单体；
3-挡墙。
具体实施方式
现在将参照附图来详细描述本发明的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本发明及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它例子可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
图1为根据本发明双单体扬声器模组的一种实施方式的内部结构的结构示意图。图2为图1所示模组的分解结构示意图。
根据图1和图2所示，本发明的双单体扬声器模组包括模组壳体1、挡墙3和两个相同的扬声器单体2a、2b。
模组壳体1被设置为具有与扬声器单体2a对应的安装位置101a、与扬声器单体2b对应的安装位置101b、及一个总的后腔104。
扬声器单体2a安装在对应的安装位置101a上，扬声器单体2b安装在对应的安装位置101b上。
挡墙3固定安装在总的后腔104中，以将总的后腔104分割为对应第一个扬声器单体2a的第一后腔104a和对应第二个扬声器单体2b的第二后腔104b，其中，第一后腔104a的容积大于第二后腔的容积104b，且第一后腔104a与第二后腔104b之间的容积差使得双单体扬声器模组具有两个 谐振频率，且两个谐振频率之间的差值在30Hz至100Hz之间(包括30Hz和100Hz)，该差值可进一步被限制在50Hz至80Hz之间(包括50Hz和80Hz)，该谐振频率为低频段阻抗值达到最大值时所对应的频率。
这说明组成双单体扬声器模组的第一单体模组与第二单体模组的谐振频率不相同，且二者之间相差30Hz至100Hz，其中，第一单体模组由第一个扬声器2a(具有独立的前腔)和第一后腔104a组成，第二单体模组由第二个扬声器2b(具有独立的前腔)和第二后腔104b组成。
单体模组的谐振频率F0的计算公式为：
Figure PCTCN2016110427-appb-000001
Figure PCTCN2016110427-appb-000002
其中，Fs为形成单体模组的扬声器单体的共振频率；Vb为单体模组的后腔容积；ρ0为空气密度，通常取1.21Kg/m3；Sd为形成单体模组的扬声器单体的有效辐射面积(m2)；C为空气中声速，通常取344m/s；Mms为振动系统的等效质量；Cms为振动系统的支撑系统的等效力顺。
由此可见，根据公式(1)和公式(2)能够确定单体模组的谐振频率F0、后腔容积Vb和扬声器单体的共振频率Fs三者之间的关系，进而在总的后腔104的容积一定的情况下，能够获得第一后腔104a与第二后腔104b的容积，以使双单体扬声器模组的两个谐振频率的差值在30Hz至100Hz之间。
如果在本发明双单体扬声器模组的基础上去除挡墙3，则总的后腔104将按照安装位置101a和安装位置101b被虚拟划分为对应第一个扬声器单体2a的后腔区域和对应第二个扬声器单体2b的后腔区域，其中，安装位置101a和安装位置101b通常情况关于进行划分的虚拟平面镜像对称，在此，将去除挡墙3的双单体扬声器模组称为参考模组，图3示出了该种参考模组的内部结构示意图。如果总的后腔104为关于该虚拟平面镜像对称或者近似镜像对称，则参考模组的第一单体模组和第二单体模组的谐振频率将相等，这说明参考模组的谐振频率将等于自身的两个单体模组的谐振 频率。
而对于本发明双单体扬声器模组，由于总的后腔104被挡墙3分割为第一后腔104a和第二后腔104b，且第一后腔104a的容积大于第二后腔104b的容积，因此，在扬声器单体相同的情况下，由于本发明模组的第一单体模组的后腔容积大于上述参考模组的第一单体模组的后腔容积，因此，前者的谐振频率将低于后者的谐振频率，同理，由于本发明模组的第二单体模组的后腔容积小于上述参考模组的第二单体模组的后腔容积，因此，前者的谐振频率将高于后者的谐振频率，这说明本发明模组将具有两个谐振频率，即存在阻抗双峰。
图4a为上述参考模组(均分总的后腔)的灵敏度随频率变化的曲线。根据图4a可知，灵敏度1-2KHz的均值为98.1dB。
图5a为本发明模组的灵敏度随频率变化的曲线。根据图5a可知，灵敏度1-2KHz的均值被提升为99.5dB，提高了1.4dB。
图4b为上述参考模组(均分总的后腔)的阻抗随频率变化的曲线。根据图4b可知，参考模组的谐振频率为610Hz。
图5b为本发明模组的阻抗随频率变化的曲线。根据图5b可知，本发明模组的谐振频率为530Hz，降低了80Hz。
根据图4a、图4b、图5a和图5b可知，本发明利用阻抗双峰降低了模组的谐振频率，并提高了模组的中频灵敏度，同时通过使得两个谐振频率相互接近进行叠加而有效保证了模组的性能。另外，由于本发明模组与相同尺寸的参考模组相比提高了中频灵敏度，因此，本发明避免了因灵敏度不足而扩大单体尺寸，不仅节省模组的内部空间，还能够满足模组尺寸更小更薄的要求。
为了便于实现对本发明模组的第一单体模组和第二单体模组的谐振频率的相近程度的限制，在本发明的一个具体实施例中，可通过挡墙3使得第一后腔104a的容积占总的后腔104的容积的百分比小于或者等于60％。
在本发明的一个具体实施例中，上述挡墙3粘接固定在总的后腔104中。在本发明的其他实施例中，上述挡墙3也可以通过超声波焊接等手段固定连接在总的后腔中。
在本发明的一个具体实施例中，该挡墙3具有吸音材料成分，以还能够通过挡墙3调节音质。该挡墙3具有吸音材料成分可以是挡墙3由吸音材料制成，也可以是挡墙包括塑制本体及粘接在塑制本体上的吸音材料等。该吸音材料。
吸音材料根据其标准定义为将对250、500、1K、2K四个频率的平均吸声系数大于0.2的材料列为是吸声材料。吸音材料大多为疏松多孔的材料，如矿渣棉、泡棉、二氧化硅、沸石、吸音棉等。吸音材料的吸声机理是声波深入材料的孔隙，且孔隙多为内部互相贯通的开口孔，受到空气分子摩擦和粘滞阻力的作用，使细小纤维作机械振动，从而使声能转变为热能。这类多孔性吸声材料的吸声系数一般从低频到高频逐渐增大，故对高频和中频的声音吸收效果较好。
在本发明的一个具体实施例中，参照图1和图2所示，挡墙3从总的后腔104的底部向上延伸至邻近两个安装位置101a、101b的位置终止，这说明挡墙3将与两个扬声器单体2a、2b的、面向后腔104的表面之间留有间隙，以使第一后腔104a与第二后腔104b在邻近两个安装位置101a、101b的一侧相通，该种结构使得两个后腔104a、104b能够共用总的后腔104的阻尼孔。
在本发明的一个具体实施例中，上述总的后腔具有关于两个安装位置之间的中截面(请见参考模组的虚拟平面)镜像对称的结构，该中截面的引入是为了限定总的后腔的结构，其是一个看不见的虚拟平面。在此基础上，在本发明的一个具体实施例中，该挡墙3平行于该中截面设置。
为了便于安装扬声器单体2a、2b，在本发明的一个具体实施例中，参见图2所示，模组壳体1包括后壳1a和前壳1b，其中，两个安装位置2a、2b形成于前壳1b上，后壳1a与前壳1b扣合在一起形成总的后腔104。后壳1a与前壳1b扣合在一起后，可通过超声焊接等手段固定在一起。在此基础上，挡墙3可以设置在前壳1b上。
本发明还提供了一种电子设备，该电子设备例如是手机、平板电脑、MP4等，其设置有根据本发明的双单体扬声器模组。
本发明还提供了一种双单体扬声器模组的设计方法，图6示出了该种 设计方法的一种实施方式的流程图。
根据图6所示，该设计方法可以包括：
步骤S601，选取两个相同的扬声器单体，这说明选取的两个扬声器单体具有相同的共振频率，之后执行步骤S602。
步骤S602，选取与扬声器单体相匹配的模组壳体，其中，模组壳体具有与两个扬声器单体一一对应的两个安装位置、与两个扬声器单体一一对应且相互隔离的两个前腔、及一个总的后腔，之后执行步骤S603。
步骤S603，根据上述公式(1)和公式(2)，按照两个扬声器单体均分总的后腔计算双单体扬声器模组的谐振频率，作为参考谐振频率，之后执行步骤S604。
步骤S604，设定第一谐振频率低于参考谐振频率，之后执行步骤S605。
步骤S605，根据扬声器单体的共振频率，根据上述公式(1)和公式(2)，计算要获得第一谐振频率对应的后腔容积作为目标容积，之后执行步骤S606。
步骤S606，从所总的后腔的容积中去除目标容积，得到剩余容积，之后执行步骤S607。
步骤S607，根据扬声器单体的共振频率和剩余容积，利用公式(1)和公式(2)计算第二谐振频率，之后执行步骤S608。
步骤S608，判断第二谐振频率与第一谐振频率之间的差值是否在30Hz至100Hz之间，如是，则执行步骤S609，如否，则回到步骤S604修改设定的第一谐振频率。
步骤S609，确定第一谐振频率为目标谐振频率，之后执行步骤S410。
步骤S610，在总的后腔中安装挡墙，以通过挡墙将总的后腔分割为对应第一个扬声器单体的第一后腔和对应第二个扬声器单体的第二后腔，且第一后腔的容积等于对应目标谐振频率的目标容积。
为了能够快速确定挡墙的位置，在本发明的一个具体实施例中，可在步骤S604中，首先设定预期要获得的谐振频率为第一谐振频率，如果首先设定的第一谐振频率满足作为目标谐振频率的条件，则即可确定挡墙的位置；如果首先设定的第一谐振频率不满足作为目标谐振频率的条件，则再 以设定步距增加固定的频率，该步距例如是5-10Hz，以修改设定的第一谐振频率，直至修改后的第一谐振频率满足作为目标谐振频率的条件为止，以使设计得到的模组的谐振频率尽可能接近预期目标。
在本发明的一个具体实施例中，总的后腔具有关于两个安装位置之间的中截面镜像对称的结构，并将挡墙沿平行于中截面的方向设置。
本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分相互参见即可，每个实施例重点说明的都是与其他实施例的不同之处，而且各个实施例可以根据需要单独使用或者相互结合使用。
虽然已经通过例子对本发明的一些特定实施例进行了详细说明，但是本领域的技术人员应该理解，以上例子仅是为了进行说明，而不是为了限制本发明的范围。本领域的技术人员应该理解，可在不脱离本发明的范围和精神的情况下，对以上实施例进行修改。本发明的范围由所附权利要求来限定。

Claims (10)

  1. 一种双单体扬声器模组，其特征在于，包括模组壳体(1)、挡墙(3)和两个相同的扬声器单体(2a、2b)；所述模组壳体(1)被设置为具有与两个扬声器单体(2a、2b)一一对应的两个安装位置(101a、101b)及一个总的后腔(104)；所述两个扬声器单体(2a、2b)安装在与各自对应的安装位置(101a、101b)上；所述挡墙(3)固定安装在所述总的后腔(104)中，以将所述总的后腔(104)分割为对应第一个扬声器单体(2a)的第一后腔(104a)和对应第二个扬声器单体(2b)的第二后腔(104b)，其中，所述第一后腔(104a)的容积大于所述第二后腔(104b)的容积，且所述第一后腔(104a)与所述第二后腔(104b)之间的容积差使得所述双单体扬声器模组出现的两个谐振频率之间的差值在30Hz至100Hz之间。
  2. 根据权利要求1所述的双单体扬声器模组，其特征在于，所述第一后腔(104a)与所述第二后腔(104b)之间的容积差使得所述双单体扬声器模组出现的两个谐振频率之间的差值在50Hz至80Hz之间。
  3. 根据权利要求1或2所述的双单体扬声器模组，其特征在于，所述第一后腔(104a)的容积占所述总的后腔的容积的百分比小于或者等于60％。
  4. 根据权利要求1至3中任一项所述的双单体扬声器模组，其特征在于，所述挡墙(3)粘接固定在所述总的后腔中。
  5. 根据权利要求1至4中任一项所述的双单体扬声器模组，其特征在于，所述挡墙(3)由吸音材料制成；或者，所述挡墙(3)包括塑制本体及粘接在所述塑制本体上的吸音材料。
  6. 根据权利要求1至5中任一项所述的双单体扬声器模组，其特征在于，所述挡墙(3)从所述总的后腔(104)的底部向上延伸至邻近所述两个安装位置(101a、101b)的位置终止，以使所述第一后腔(104a)与所述第二后腔(104b)在邻近所述两个安装位置(101a、101b)的一侧相 通。
  7. 根据权利要求1至6中任一项所述的双单体扬声器模组，其特征在于，所述总的后腔(104)具有关于所述两个安装位置(101a、101b)之间的中截面镜像对称的结构。
  8. 根据权利要求7所述的双单体扬声器模组，其特征在于，所述挡墙(3)平行于所述中截面设置。
  9. 一种双单体扬声器模组的设计方法，其特征在于，包括：
    选取两个相同的扬声器单体(2a、2b)；
    选取与所述扬声器单体(2a、2b)相匹配的模组壳体(1)，其中，所述模组壳体(1)具有与两个扬声器单体(2a、2b)一一对应的两个安装位置(101a、101b)及一个总的后腔(104)；
    按照两个扬声器单体(2a、2b)均分所述总的后腔(104)计算所述双单体扬声器模组的谐振频率，作为参考谐振频率；
    设定第一谐振频率低于所述参考谐振频率；
    根据所述扬声器单体(2a、2b)的共振频率，计算要获得所述第一谐振频率对应的后腔容积作为目标容积；
    从所述总的后腔(104)的容积中去除所述目标容积，得到剩余容积；
    根据所述扬声器单体(2a、2b)的共振频率和所述剩余容积，计算第二谐振频率；
    判断所述第二谐振频率与所述第一谐振频率之间的差值是否在30Hz至100Hz之间，如是，则确定所述第一谐振频率为目标谐振频率，如否，则修改设定的第一谐振频率；
    在所述总的后腔中安装挡墙(3)，以通过挡墙(3)将所述总的后腔(104)分割为对应第一个扬声器单体(2a)的第一后腔(104a)和对应第二个扬声器单体(2b)的第二后腔(104b)，且所述第一后腔(104a)的容积等于对应所述目标谐振频率的目标容积。
  10. 一种电子设备，其特征在于，设置有权利要求1至8中任一项所述的双单体扬声器模组。
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