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 PDFInfo
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- 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
- absorption material
- sound absorption
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 78
- 239000000463 material Substances 0.000 title claims abstract description 77
- 230000005540 biological transmission Effects 0.000 claims abstract description 36
- 238000009434 installation Methods 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 239000011358 absorbing material Substances 0.000 claims description 53
- 239000002245 particle Substances 0.000 claims description 15
- 229920000877 Melamine resin Polymers 0.000 claims description 4
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 4
- 239000011152 fibreglass Substances 0.000 claims 2
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
Images
Classifications
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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
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- 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
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. A sound absorption material filling structure is suitable for a closed loudspeaker system or a closed box part of the loudspeaker system, and is characterized by comprising a loudspeaker single body (4), a box body of the closed loudspeaker system and a sound absorption material component (5) for wrapping the sound absorption material;
the sound absorption material component (5) is arranged in the box body, the sound absorption material component (5) comprises a sound-transmitting front end surface (1) and a sound-transmitting rear end surface (2), and the front end surface (1) and the sound-transmitting rear end surface (2) are perpendicular to the sound transmission direction;
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 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 (5) 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.
2. The sound absorbing infill structure of claim 1, wherein said sound absorbing material is one or more of sound absorbing particles, melamine, or fiberglass.
3. A sound-absorbing material filling structure as claimed in claim 1, wherein the sound-absorbing material member (5) abuts against the speaker unit (4) in the sound-transmitting direction, leaving a space between the sound-absorbing material member (5) and the rear wall (7) of the cabinet, which is not filled with the sound-absorbing material.
4. A sound-absorbing material filling structure as defined in claim 1, wherein the sound-absorbing material member (5) is placed against the rear wall (7) of the cabinet in the sound-transmitting direction, leaving a space between the speaker unit (4) and the front end face of the sound-absorbing material member (5) which is not filled with the sound-absorbing material.
5. The sound absorbing material filling structure according to claim 1, wherein the sound absorbing material member (5) is located at any position between the speaker unit (4) and the rear wall (7) of the cabinet in the sound transmission direction, leaving a space not filled with the sound absorbing material between the speaker unit (4) and the front end face (8) of the sound absorbing material member (5), and between the rear end face (9) of the sound absorbing material member (5) and the rear wall (7) of the cabinet.
6. A closed loudspeaker system comprises a loudspeaker single body (4) and a box body of the closed loudspeaker system, and is characterized by also comprising a sound absorption material component (5) used for wrapping sound absorption materials;
the sound absorption material component (5) is arranged in the box body, the sound absorption material component (5) comprises a sound-transmitting front end surface (1) and a sound-transmitting rear end surface (2), and the front end surface (1) and the sound-transmitting rear end surface (2) are perpendicular to the sound transmission direction;
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 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 (5) 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.
7. The enclosed speaker system of claim 1, wherein the sound absorbing material is one or more of sound absorbing particles, melamine, or fiberglass.
8. A closed loudspeaker system according to claim 1, characterised in that the sound-absorbing material package (5) abuts against the loudspeaker unit (4) in the sound transmission direction, leaving a space between the sound-absorbing material package (5) and the rear wall (7) of the cabinet which is not filled with sound-absorbing material.
9. A closed loudspeaker system according to claim 1, characterised in that the sound-absorbing material package (5) is placed against the rear wall (7) of the cabinet in the sound transmission direction, leaving a space between the loudspeaker cell (4) and the front face of the sound-absorbing material package (5) that is not filled with sound-absorbing material.
10. A closed speaker system according to claim 1, wherein the sound absorbing material assembly (5) is located at any position between the speaker unit (4) and the cabinet rear wall (7) in the sound transmission direction, leaving a space not filled with the sound absorbing material 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 cabinet rear wall (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010159965.0A CN113382343A (en) | 2020-03-10 | 2020-03-10 | Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010159965.0A CN113382343A (en) | 2020-03-10 | 2020-03-10 | Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system |
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| Publication Number | Publication Date |
|---|---|
| CN113382343A true CN113382343A (en) | 2021-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010159965.0A Pending CN113382343A (en) | 2020-03-10 | 2020-03-10 | Filling structure of sound absorption material in loudspeaker cavity and closed loudspeaker system |
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Citations (3)
| 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 |
-
2020
- 2020-03-10 CN CN202010159965.0A patent/CN113382343A/en active Pending
Patent Citations (3)
| 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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