CN113382343A - Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system - Google Patents

Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system Download PDF

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Publication number
CN113382343A
CN113382343A CN202010159965.0A CN202010159965A CN113382343A CN 113382343 A CN113382343 A CN 113382343A CN 202010159965 A CN202010159965 A CN 202010159965A CN 113382343 A CN113382343 A CN 113382343A
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sound
absorbing material
box body
material assembly
absorption material
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沈勇
刘为
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Nanjing University
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Nanjing University
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Priority to CN202010159965.0A priority Critical patent/CN113382343A/en
Publication of CN113382343A publication Critical patent/CN113382343A/en
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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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2873—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself for loudspeaker transducers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/165—Particles in a matrix

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

The invention relates to a filling structure of a sound absorption material in a loudspeaker cavity and a closed loudspeaker system. The closed box part is suitable for a closed loudspeaker system or a loudspeaker system and comprises a loudspeaker single body, a box body of the closed loudspeaker system and a sound absorption material component used for wrapping the sound absorption material; the sound absorption material assembly is arranged in the box body and comprises a sound transmission front end face and a sound transmission rear end face, and the front end face and the sound transmission rear end face are perpendicular to the sound transmission direction; the peripheral frame of the sound absorption material assembly is a hard frame, and the outer surface of the hard frame is used as an installation surface and is tightly matched and fixed with the inner wall of the box body or the installation part on the inner wall of the box body; the thickness of the sound absorption material component is smaller than the length of the box body in the sound transmission direction, so that a space which is not filled with the sound absorption material is reserved inside the box body in the sound transmission direction. The invention can reduce the filling cost of the sound absorption material and simultaneously ensure that the performance of the loudspeaker system is better.

Description

Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system
Technical Field
The invention relates to a filling structure of sound absorption materials in a loudspeaker cavity and a closed loudspeaker system or a closed box part of the loudspeaker system.
Background
Sound-absorbing materials are mostly used in the loudspeaker box body so as to achieve the effects of eliminating sound short circuit and reducing resonance frequency. A plurality of novel sound absorption materials are filled in the packaging mold when packaging is considered. The utility model with publication number CN206908832U discloses a method for filling sound-absorbing particles in a box, which specially isolates and fills a position 600 for placing sound-absorbing particles in a rear sound cavity to save the sound-absorbing particles. However, in this technique, the sound absorbing particles are laterally filled, and the sound absorbing particles cannot be fully utilized in the sound propagation direction, but are filled as many as possible, which is not only inefficient in sound absorption but also costly in large quantity.
Another method of filling sound-absorbing particles in a box is disclosed in utility model publication No. CN 107147979A. Specifically, sound-absorbing particles are placed in the middle or the rear section of the rear sound cavity. The technology can effectively prevent … … sound-absorbing materials from appearing in the middle frequency valley, and avoid the problems that the sound-absorbing cotton 20 is excessively increased to cause the reduction of the F0 of the loudspeaker module and the increase of the low-frequency loudness. That is, this technique achieves a reduction in the mid-frequency dip of the frequency response, i.e., bass at mid-frequency, but cannot reduce the resonant frequency F0 too low. Therefore, this method cannot solve the problem of enhancing the acoustic performance of the speaker by lowering the resonance frequency F0 as much as possible. That is, it is difficult to realize low-frequency dive and reproduce sounds of lower frequencies.
In addition, in the first two prior arts, the sound cavity is divided into a front sound cavity and a rear sound cavity by the speaker unit, the rear sound cavity is flat and long, sound-absorbing particles are placed at the rear end of the rear sound cavity in the middle section of the flat and long, and the sound-absorbing particles are placed in the middle section and the rear section of the rear sound cavity. Therefore, the first two prior arts are both suitable for the micro speaker system in the mobile phone, and are not suitable for the closed speaker system. And the sound absorption particles are fixed by forging the grooves, and the positions are inconvenient to adjust once fixed. The enclosed speaker system is relatively much larger in volume, and has only one acoustic chamber, no division of the front and rear acoustic chambers, and a generally rectangular chamber.
Disclosure of Invention
In order to solve the technical defects, the invention provides a filling structure of a sound absorption material in a loudspeaker cavity and a closed loudspeaker system.
On one hand, the sound absorption material filling structure is suitable for a closed loudspeaker system or a closed box part of the loudspeaker system, and comprises a loudspeaker single body, a box body of the closed loudspeaker system and a sound absorption material assembly for wrapping the sound absorption material; the sound absorption material assembly is arranged in the box body and comprises a sound transmission front end face and a sound transmission rear end face, and the front end face and the sound transmission rear end face are perpendicular to the sound transmission direction; the peripheral frame of the sound absorption material assembly is a hard frame, and the outer surface of the hard frame is used as an installation surface and is tightly matched and fixed with the inner wall of the box body or the installation part on the inner wall of the box body; the thickness of the sound absorption material component is smaller than the length of the box body in the sound transmission direction, so that a space which is not filled with the sound absorption material is reserved inside the box body in the sound transmission direction.
On the other hand, the embodiment of the application provides a closed loudspeaker system, which comprises a loudspeaker single body, a box body of the closed loudspeaker system and a sound absorption material assembly used for wrapping sound absorption materials; the sound absorption material assembly is arranged in the box body and comprises a sound transmission front end face and a sound transmission rear end face, and the front end face and the sound transmission rear end face are perpendicular to the sound transmission direction; the peripheral frame of the sound absorption material assembly is a hard frame, and the outer surface of the hard frame is used as an installation surface and is tightly matched and fixed with the inner wall of the box body or the installation part on the inner wall of the box body; the thickness of the sound absorption material component is smaller than the length of the box body in the sound transmission direction, so that a space which is not filled with the sound absorption material is reserved inside the box body in the sound transmission direction.
In the foregoing embodiments, as a preferred embodiment, the sound-absorbing material is one or more of sound-absorbing particles, melamine, or glass fibers.
In the foregoing embodiment, as a preferred embodiment, the sound absorbing material assembly abuts against the speaker unit in the sound transmission direction, leaving a space between the sound absorbing material assembly and the rear wall of the cabinet, which is not filled with the sound absorbing material.
In the foregoing embodiment, as a preferred embodiment, the sound absorbing material assembly is placed against the rear wall of the cabinet in the sound transmission direction, leaving a space unfilled with the sound absorbing material between the speaker unit and the front end face of the sound absorbing material assembly.
In the foregoing embodiment, as a preferable mode, the sound absorbing material assembly is located at any position between the speaker unit and the rear wall of the cabinet in the sound transmission direction, and a space not filled with the sound absorbing material is left between the speaker unit and the front end face of the sound absorbing material assembly, and between the rear end face of the sound absorbing material assembly and the rear wall of the cabinet.
Compared with the prior art, the invention has the remarkable advantages that:
(1) according to the sound absorption material filling structure, under the condition that a sound absorption material is not required to be used for completely filling the loudspeaker box body, the resonance frequency F0 is reduced as much as possible, the acoustic performance of the loudspeaker is enhanced, the low-frequency diving is realized, and the sound of lower frequency is played back;
(2) the invention does not need to divide the sound cavity into a front cavity and a rear cavity, and is particularly suitable for a closed loudspeaker system or a closed box part of the loudspeaker system;
(3) by using the sound absorption material filling structure, the sound absorption material assembly can be conveniently placed at any position in the loudspeaker box body, so that the sound absorption material assembly is convenient to adjust, install and maintain, and a sound absorption material filling station does not need to be manufactured in the loudspeaker box body in advance;
(4) the closed type loudspeaker system can obtain a loudspeaker system with better acoustic performance under the condition of using a small amount of sound absorption particle materials, greatly reduces the filling cost of the sound absorption material materials, and simultaneously can smooth a frequency response curve, reduce the resonance frequency F0 and obtain the closed type loudspeaker system with good low-frequency effect and smooth sound curve.
Drawings
FIG. 1 is a schematic view of a sound absorbing material assembly;
FIG. 2 is a schematic view of a sound absorbing material assembly placed against a speaker cell;
FIG. 3 is a schematic view of a sound absorbing material assembly located anywhere between the speaker cell and the bottom of the rear acoustic chamber;
FIG. 4 is a schematic view of the placement of the sound absorbing material assembly against the bottom of the rear acoustic chamber;
fig. 5 is a schematic diagram of the resonant frequency of the speaker module when the sound absorbing material is not filled in the cavity and when the sound absorbing material is filled in the cavity, as shown in fig. 2, 3 and 4.
Detailed Description
It is easily understood that various embodiments of the present invention can be conceived by those skilled in the art according to the technical solution of the present invention without changing the essential spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the present invention, the closed type speaker system includes a speaker unit 4, a cabinet, and a sound absorbing material assembly 5. The sound absorption material assembly 5 is filled with sound absorption material. The sound absorption material assembly 5 has a certain thickness and includes a front end surface 1 and a rear end surface 2, and the front end surface 1 and the rear end surface 2 serve as sound transmission surfaces. The peripheral frame of the sound absorption material component 5 is a hard frame, and the outer surface of the hard frame is used as a mounting surface and is tightly matched and fixed with the inner wall of the box body or the mounting part on the inner wall, for example, in interference fit. The thickness of the sound absorption material component 5 is smaller than the length of the box body in the sound transmission direction, namely, after the sound absorption material component 5 is placed in the box body, part of the space of the box body is still not filled with sound absorption materials.
The peripheral hard frame of the sound absorption material component 5 can be a cuboid, a cube, a cylinder and other shapes matched with the inner wall of the loudspeaker box body.
The invention also provides a closed type loudspeaker system, which comprises a loudspeaker single body 4, a box body and a sound absorption material component 5. The speaker unit 4 is embedded in a plane baffle or mounted on a cabinet. The sound absorption material component 5 is arranged in the box inner cavity 6, and the front end face and the rear end face of the sound particle component 5 are perpendicular to the sound transmission direction. Assuming that the speaker unit is located at the front end, the cabinet side wall corresponding to the speaker unit in the sound transmission direction is referred to as a cabinet rear wall 7. The thickness of the sound absorbing material assembly 5 in the sound transmission direction is smaller than the distance between the speaker unit and the cabinet rear wall 7. That is, the sound-absorbing material assembly 5 does not completely fill the inside of the case, leaving a space in the case that is not filled with the sound-absorbing material.
As shown in fig. 2, 3, 4, the sound absorbing material assembly 5 is placed in one of the following ways:
in the first placement mode, the sound absorption material component 5 is abutted against the loudspeaker single body 4, and a space which is not filled with the sound absorption material is reserved between the sound absorption material component 5 and the rear wall 7 of the box body;
in the second placement mode, the sound absorption material component 5 is positioned at any position between the loudspeaker monomer 4 and the rear wall 7 of the box body, and a space which is not filled with the sound absorption material is reserved between the loudspeaker monomer 4 and the front end surface of the sound absorption material component 5 and between the rear end surface of the sound absorption material component 5 and the rear wall 7 of the box body;
the third placing mode is as follows: the sound absorption material component 5 is closely arranged against the rear wall 7 of the box body, and a space which is not filled with the sound absorption material is reserved between the loudspeaker monomer 4 and the front end face of the sound absorption material component 5.
In the technical scheme provided by the invention, the sound absorption material can be a granular sound absorption material, and for common sound absorption materials such as melamine, glass fiber and other sound absorption materials, a mode of reserving a cavity can be adopted to achieve the effect of reducing the cost.
As shown in fig. 5, the experimental results show that, compared with the sound absorbing material which is not filled, the resonant frequency is greatly reduced after the sound absorbing material assembly is placed; compared with the sound cavity filled with the sound absorption material, the sound cavity can reduce the resonant frequency by 13Hz only by using the sound absorption material with the volume about one fourth of that of the cavity in the closed loudspeaker module, thereby greatly reducing the filling cost of the sound absorption material. Preferably, the sound absorbing material assembly 5 is placed in close proximity to the speaker unit 4, which is most effective and allows a better performance of the speaker system with less filling of sound absorbing material.

Claims (10)

1.一种吸声材料填充结构，适用于封闭式扬声器系统或扬声器系统的封闭箱部分，其特征在于，包括扬声器单体(4)、封闭式扬声器系统的箱体以及用于包裹吸声材料的吸声材料组件(5)；1. A sound-absorbing material filling structure, suitable for a closed-type loudspeaker system or a closed box part of a loudspeaker system, is characterized in that, comprising a speaker unit (4), a box of the closed-type loudspeaker system and a sound-absorbing material for wrapping The sound-absorbing material assembly (5); 所述吸声材料组件(5)设置在箱体中，吸声材料组件(5)包括透声的前端面(1)和后端面(2)，前端面(1)和后端面(2)垂直于传声方向；The sound-absorbing material assembly (5) is arranged in the box body, and the sound-absorbing material assembly (5) includes a sound-transmitting front end surface (1) and a rear end surface (2), and the front end surface (1) and the rear end surface (2) are vertical in the direction of sound transmission; 吸声材料组件(5)的四周边框为硬质边框，硬质边框外表面作为安装面，与箱体内壁或箱体内壁上的安装部紧配合固定；吸声材料组件(5)的厚度小于箱体在传声方向的长度，以使得在传声方向上，箱体内部留有未填充吸声材料的空间。The surrounding frame of the sound-absorbing material component (5) is a hard frame, and the outer surface of the hard frame is used as a mounting surface, which is tightly fitted and fixed with the inner wall of the box or the mounting part on the inner wall of the box; the thickness of the sound-absorbing material component (5) is less than The length of the box body in the sound transmission direction, so that in the sound transmission direction, there is a space unfilled with sound absorbing material inside the box body. 2.如权利要求1所述的吸声材料填充结构，其特征在于，所述吸声材料为吸声颗粒、三聚氰胺或玻璃纤维中的一种或多种。2 . The sound-absorbing material filling structure according to claim 1 , wherein the sound-absorbing material is one or more of sound-absorbing particles, melamine or glass fiber. 3 . 3.如权利要求1所述的吸声材料填充结构，其特征在于，在传声方向上，吸声材料组件(5)紧靠扬声器单体(4)，吸声材料组件(5)与箱体后壁(7)之间留有未填充吸声材料的空间。3. The sound-absorbing material filling structure according to claim 1, characterized in that, in the sound transmission direction, the sound-absorbing material assembly (5) is close to the speaker unit (4), and the sound-absorbing material assembly (5) is connected to the box. A space unfilled with sound absorbing material is left between the body rear walls (7). 4.如权利要求1所述的吸声材料填充结构，其特征在于，在传声方向上，吸声材料组件(5)紧靠箱体后壁(7)放置，在扬声器单体(4)与吸声材料组件(5)前端面之间留有未填充吸声材料的空间。4. The sound-absorbing material filling structure according to claim 1, characterized in that, in the direction of sound transmission, the sound-absorbing material assembly (5) is placed close to the rear wall (7) of the box body, and the sound-absorbing material assembly (5) is placed close to the rear wall (7) of the box body, and the speaker unit (4) A space that is not filled with sound absorbing material is left between it and the front end face of the sound absorbing material assembly (5). 5.如权利要求1所述的吸声材料填充结构，其特征在于，在传声方向上，吸声材料组件(5)位于扬声器单体(4)与箱体后壁(7)之间的任意位置，在扬声器单体(4)与吸声材料组件(5)的前端面(8)之间，以及在吸声材料组件(5)的后端面(9)与箱体后壁(7)之间留有未填充吸声材料的空间。5. The sound-absorbing material filling structure according to claim 1, characterized in that, in the direction of sound transmission, the sound-absorbing material assembly (5) is located between the speaker unit (4) and the rear wall (7) of the box body Any position, between the speaker unit (4) and the front face (8) of the sound absorbing material assembly (5), and between the rear face (9) of the sound absorbing material assembly (5) and the rear wall (7) of the cabinet There is a space in between that is not filled with sound absorbing material. 6.一种封闭式扬声器系统，包括扬声器单体(4)和封闭式扬声器系统的箱体，其特征在于，还包括用于包裹吸声材料的吸声材料组件(5)；6. A closed loudspeaker system, comprising a speaker unit (4) and a cabinet of the closed loudspeaker system, characterized in that it also comprises a sound-absorbing material assembly (5) for wrapping the sound-absorbing material; 所述吸声材料组件(5)设置在箱体中，吸声材料组件(5)包括透声的前端面(1)和后端面(2)，前端面(1)和后端面(2)垂直于传声方向；The sound-absorbing material assembly (5) is arranged in the box body, and the sound-absorbing material assembly (5) includes a sound-transmitting front end surface (1) and a rear end surface (2), and the front end surface (1) and the rear end surface (2) are vertical in the direction of sound transmission; 吸声材料组件(5)的四周边框为硬质边框，硬质边框外表面作为安装面，与箱体内壁或箱体内壁上的安装部紧配合固定；吸声材料组件(5)的厚度小于箱体在传声方向的长度，以使得在传声方向上，箱体内部留有未填充吸声材料的空间。The surrounding frame of the sound-absorbing material component (5) is a hard frame, and the outer surface of the hard frame is used as a mounting surface, which is tightly fitted and fixed with the inner wall of the box or the mounting part on the inner wall of the box; the thickness of the sound-absorbing material component (5) is less than The length of the box body in the sound transmission direction, so that in the sound transmission direction, there is a space unfilled with sound absorbing material inside the box body. 7.如权利要求1所述的封闭式扬声器系统，其特征在于，所述吸声材料为吸声颗粒、三聚氰胺或玻璃纤维中的一种或多种。7. The closed speaker system according to claim 1, wherein the sound-absorbing material is one or more of sound-absorbing particles, melamine or glass fiber. 8.如权利要求1所述的封闭式扬声器系统，其特征在于，在传声方向上，吸声材料组件(5)紧靠扬声器单体(4)，吸声材料组件(5)与箱体后壁(7)之间留有未填充吸声材料的空间。8. The closed speaker system according to claim 1, characterized in that, in the sound transmission direction, the sound absorbing material assembly (5) is close to the speaker unit (4), and the sound absorbing material assembly (5) is connected to the box body A space unfilled with sound absorbing material is left between the rear walls (7). 9.如权利要求1所述的封闭式扬声器系统，其特征在于，在传声方向上，吸声材料组件(5)紧靠箱体后壁(7)放置，在扬声器单体(4)与吸声材料组件(5)前端面之间留有未填充吸声材料的空间。9. The enclosed loudspeaker system according to claim 1, characterized in that, in the sound transmission direction, the sound absorbing material assembly (5) is placed close to the rear wall (7) of the box body, and the sound absorbing material assembly (5) is placed between the speaker unit (4) and the rear wall (7) of the box body. A space unfilled with sound absorbing material is left between the front end surfaces of the sound absorbing material component (5). 10.如权利要求1所述的封闭式扬声器系统，其特征在于，在传声方向上，吸声材料组件(5)位于扬声器单体(4)与箱体后壁(7)之间的任意位置，在扬声器单体(4)与吸声材料组件(5)的前端面(8)之间，以及在吸声材料组件(5)的后端面(9)与箱体后壁(7)之间留有未填充吸声材料的空间。10. The enclosed loudspeaker system according to claim 1, characterized in that, in the sound transmission direction, the sound absorbing material assembly (5) is located anywhere between the loudspeaker unit (4) and the rear wall (7) of the box body The position is between the speaker unit (4) and the front end face (8) of the sound absorbing material assembly (5), and between the rear end face (9) of the sound absorbing material assembly (5) and the rear wall (7) of the cabinet There is a space that is not filled with sound-absorbing material.
CN202010159965.0A 2020-03-10 2020-03-10 Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system Pending CN113382343A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204291362U (en) * 2015-01-06 2015-04-22 歌尔声学股份有限公司 A kind of loud speaker module
CN209283504U (en) * 2019-01-31 2019-08-20 歌尔科技有限公司 A kind of loudspeaker mould group and electronic equipment
CN212413410U (en) * 2020-03-10 2021-01-26 南京大学 Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204291362U (en) * 2015-01-06 2015-04-22 歌尔声学股份有限公司 A kind of loud speaker module
CN209283504U (en) * 2019-01-31 2019-08-20 歌尔科技有限公司 A kind of loudspeaker mould group and electronic equipment
CN212413410U (en) * 2020-03-10 2021-01-26 南京大学 Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system

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