CN108134972B

CN108134972B - Can strengthen audio amplifier of low frequency

Info

Publication number: CN108134972B
Application number: CN201711437057.8A
Authority: CN
Inventors: 李立忠; 梁国华; 满方明; 许王华; 杨晓明; 江戈波
Original assignee: Shanghai Amphenol Airwave Communication Electronics Co Ltd
Current assignee: Shanghai Amphenol Airwave Communication Electronics Co Ltd
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2020-11-17
Anticipated expiration: 2037-12-26
Also published as: CN108134972A

Abstract

The invention provides a sound box capable of enhancing low frequency, which comprises a shell and a loudspeaker arranged on the shell, wherein the shell and the loudspeaker form a sealed cavity, and the inner wall of the shell is provided with a sound absorption structure for absorbing sound waves. The sound absorbing structure comprises a multi-reflecting-surface cylinder and a porous membrane, wherein the porous membrane is arranged on the shell and forms a reflecting cavity with the shell, and the multi-reflecting-surface cylinder is formed in the reflecting cavity. According to the invention, the porous membrane and the multi-reflecting-surface cylinder are arranged on the inner wall of the shell, part of sound waves enter the reflecting cavity through the through hole of the porous membrane and are reflected by the multi-reflecting-surface cylinder to consume energy, so that the directly reflected sound waves are reduced, the effective volume of the sealed cavity is increased, the low-frequency bandwidth is improved, and the tone quality is improved.

Description

Can strengthen audio amplifier of low frequency

Technical Field

The invention relates to the technical field of multimedia audio equipment, in particular to a sound box with a better bass effect.

Background

The existing sound box body is internally added with sound-absorbing cotton to improve the low frequency of the loudspeaker system and eliminate resonance, and the miniature sound box body in an electronic product also adopts the design form. As shown in fig. 1, the whole product design is a sound box body composed of a loudspeaker 2, a front shell 11 and a rear shell 12, and the low frequency of the micro sound box body cannot be too low due to the power limitation of electronic products. Under the condition that the space is enough, the low frequency can be improved without adding sound absorption cotton, but under most conditions, the size of the whole sound box body is reduced due to the structural limitation of electronic products, the effective replay bandwidth of the low frequency of the sound box is directly influenced by the size of the sound box body, the smaller the sound box body is, the worse the low frequency is, and therefore in a limited micro sound box body, the sound box body of electronic equipment such as a mobile phone and the like cannot obtain good low frequency. In order to solve the problem, as shown in fig. 2, in a conventional method, sound-absorbing cotton is added inside a box body of a miniature sound box to improve the low-frequency width and the tone quality, the added sound-absorbing cotton is improved to a certain extent, but the volume of the sound-absorbing cotton added in a limited space is small, and the added sound-absorbing cotton can not be realized in all areas, and the volume of the effective box body increased by the sound-absorbing cotton can only be increased by original 40% theoretically, but cannot be increased infinitely, so that the added sound-absorbing cotton can improve the low frequency and the tone quality and can not meet the functional requirements.

Disclosure of Invention

The invention aims to provide a sound box with better sound absorption effect and capable of enhancing low frequency, so as to solve the technical problem of improving low frequency bandwidth in a limited space.

The invention provides a sound box capable of enhancing low frequency, which comprises a shell, a loudspeaker arranged on the shell and a sound absorption structure arranged on the inner wall of the shell, wherein the shell and the loudspeaker form a sealed cavity, the sound absorption structure is used for absorbing sound waves and comprises a multi-reflecting-surface cylinder and a porous membrane, the porous membrane is arranged on the shell and forms a reflecting cavity with the shell, the multi-reflecting-surface cylinder is formed in the reflecting cavity, the sound waves enter the reflecting cavity from the porous membrane, the energy consumption is carried out through the reflection of the multi-reflecting-surface cylinder, and the directly reflected sound waves are reduced.

Preferably, a groove is formed in a region where the sound-absorbing structure is installed in the housing, the porous film covers the groove, and the reflection cavity is formed in the groove.

Preferably, the multiple reflecting surface cylinders are arranged on the shell.

Preferably, sound-absorbing cotton is arranged in the sealed cavity.

Preferably, the housing comprises a front shell and a rear shell which are fixedly connected with each other, the speaker is fixedly connected to the front shell, the rear shell and the speaker form the sealed cavity, and the sound-absorbing structure is arranged on the front shell or/and the rear shell.

Preferably, the front shell and the sound-absorbing structure arranged on the inner wall of the front shell form a front sound-absorbing plate, and the rear shell and the sound-absorbing structure arranged on the inner wall of the rear shell form a rear sound-absorbing plate.

Preferably, the front shell and the rear shell are connected by a sealant.

Preferably, the porous membrane is provided with a plurality of through holes.

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

the invention provides a sound box capable of enhancing low frequency, wherein a porous membrane and a multi-reflecting surface cylinder are arranged on the inner wall of a shell, part of sound waves enter a reflecting cavity from through holes of the porous membrane and are reflected by the multi-reflecting surface cylinder to consume energy, so that the directly reflected sound waves are reduced, the effective volume of the sealed cavity is increased, the low-frequency bandwidth is improved, and the sound quality is improved.

Drawings

Fig. 1 is a schematic structural diagram of a conventional loudspeaker box device;

FIG. 2 is a schematic structural diagram of a conventional speaker apparatus II;

FIG. 3 is a schematic cross-sectional view of the present invention;

fig. 4 is an exploded schematic view of the rear sound-absorbing panel.

The sound absorption type loudspeaker comprises a front shell 11, a front shell 12, a rear shell 13, a sealing layer 2, a loudspeaker 31, a porous membrane 311, a through hole 32, a multi-reflecting-surface cylinder 4, sound absorption cotton 5, a sealed cavity 6 and a reflecting cavity.

Detailed Description

The invention is described in detail below with reference to a specific embodiment thereof, with reference to the accompanying drawings.

As shown in fig. 3, the present invention provides a sound box capable of enhancing low frequency, which is mainly applied to electronic products, and includes a housing, a speaker 2 and a sound absorption structure, wherein the housing includes a front shell 11 and a rear shell 12, the front shell 11 is connected to the rear shell 12 and the speaker 2 through a sealant, and a sealing layer 13 is formed. The front housing 11, the rear housing 12 and the loudspeaker 2 together form a sealed chamber 5. The volume of the sealed chamber 5 directly affects the effective playback bandwidth of the low frequencies of the loudspeaker 2, and therefore a sound absorbing structure is provided on the inner wall of the housing for absorbing sound waves, increasing the effective volume of the sealed chamber 5.

The sound absorption structure can be arranged on the front shell 11 or/and the rear shell 12, and when the sound absorption structure is arranged on the front shell 11, the front shell 11 and the sound absorption structure arranged on the front shell 11 form a front sound absorption plate; when the sound-absorbing structure is provided on the rear case 12, the rear case 12 and the sound-absorbing structure provided on the rear case 12 form a rear sound-absorbing panel, which will be described as an example in this embodiment. As shown in fig. 3 and 4, a groove is formed on the area where the rear case 12 is connected to the sound-absorbing structure, a porous film 31 in the sound-absorbing structure covers the groove, and the periphery thereof is fixed on the rear case 12, a reflective cavity 6 is formed between the porous film 31 and the groove, and a multi-reflective-surface cylinder 32 in the sound-absorbing structure is placed in the reflective cavity 6 and fixed on the rear case 12. The porous film 31 is provided with a plurality of through holes 311, sound waves enter the reflection cavity 6 from the through holes 311 of the porous film 31 and are reflected by the multi-reflection-surface column 32 to consume energy, so that the directly reflected sound waves are reduced, the effective volume of the sealed cavity 5 is increased, and the low-frequency bandwidth is improved.

Fig. 2 shows a sound absorption technical scheme of a sound box in the prior art, namely, sound absorption cotton 4 is filled in a sealed cavity 5. This application can improve on prior art's basis, also can not add and inhale sound cotton 4, and set up alone and inhale the sound structure, selects the former in this embodiment, sets up on adding the basis of inhaling sound cotton 4 promptly and inhales the sound structure to acquire more excellent sound effect of inhaling.

In the invention, the porous membrane 31 and the multi-reflecting surface column 32 are arranged on the inner wall of the shell, sound waves enter the reflecting cavity 6 from the through hole 311 of the porous membrane 31 and are reflected by the multi-reflecting surface column 32 to consume energy, so that the directly reflected back sound waves are reduced, the low-frequency bandwidth is improved, and the sound quality is improved.

The disclosure above is only one specific embodiment of the present application, but the present application is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present application.

Claims

1. A sound box capable of enhancing low frequency comprises a shell and a loudspeaker arranged on the shell, wherein the shell and the loudspeaker form a sealed cavity,

also comprises a sound absorption structure arranged on the inner wall of the shell and used for absorbing sound waves,

the sound absorption structure comprises a plurality of multi-reflecting-surface cylinders and a porous film, wherein the porous film is provided with a plurality of through holes, the porous film is arranged on the shell and forms a reflecting cavity with the shell, the multi-reflecting-surface cylinders are arranged in the reflecting cavity and are arranged at intervals, the through holes are opposite to gaps between the adjacent multi-reflecting-surface cylinders, the gaps between the adjacent multi-reflecting-surface cylinders are communicated with each other, and the aperture of each through hole is larger than that of the gaps between the adjacent multi-reflecting-surface cylinders;

sound waves enter the reflecting cavity from the porous film and are reflected by the cylinders with multiple reflecting surfaces to consume energy, so that the directly reflected sound waves are reduced;

and sound-absorbing cotton is arranged in the sealed cavity.

2. An acoustic enclosure according to claim 1, wherein the area of the housing in which the sound absorbing structure is located is provided with a recess, and the porous membrane covers the recess and forms the reflective cavity with the housing in the recess.

3. The acoustic enclosure for boosting low frequencies of claim 1, wherein the multi-faceted cylindrical body is disposed on the housing.

4. An acoustic enclosure for amplifying low frequencies according to any of claims 1 to 3, wherein the enclosure comprises a front housing and a rear housing which are fixedly connected, the loudspeaker being fixedly connected to the front housing, the rear housing and the loudspeaker forming the sealed enclosure,

the sound absorption structure is arranged on the front shell or/and the rear shell.

5. An acoustic enclosure for amplifying low frequencies according to claim 4, wherein the front housing and the sound-absorbing structure provided on the inner wall thereof form a front sound-absorbing panel when the sound-absorbing structure is provided on the front housing; when the rear shell is provided with the sound absorption structure, the rear shell and the sound absorption structure arranged on the inner wall of the rear shell form a rear sound absorption plate.

6. The acoustic enclosure for boosting low frequencies of claim 4, wherein said front and rear housings are joined by a sealant.