CN111372153A

CN111372153A - Sound box structure

Info

Publication number: CN111372153A
Application number: CN202010385258.3A
Authority: CN
Inventors: 张洋
Original assignee: Shenzhen Leading Technology Co ltd
Current assignee: Shenzhen Leading Technology Co ltd
Priority date: 2020-05-09
Filing date: 2020-05-09
Publication date: 2020-07-03

Abstract

The invention discloses a sound structure, which comprises a sound box, wherein a loudspeaker unit is arranged in the sound box, the loudspeaker unit is arranged on a lower panel of the sound box, and the sound structure also comprises: the loudspeaker comprises a scattering shell positioned below a loudspeaker unit, a supporting structure connected below the scattering shell, and a connecting piece used for connecting a sound box and the supporting structure; the scattering shell is provided with at least one through hole, a cavity is formed between the scattering shell and the supporting structure in a surrounding mode, the cavity is communicated with the outside through the at least one through hole, and the cavity and the at least one through hole form a resonance sound absorption structure. The sound structure of the invention improves the traditional reflection cone into the scattering shell with the through hole, and the scattering shell and the supporting structure below the scattering shell form a cavity in a surrounding way, thereby forming the resonance sound absorption structure.

Description

Sound box structure

Technical Field

The invention relates to the technical field of sound equipment, in particular to a sound equipment structure.

Background

As shown in fig. 1, in most acoustic design structures, a speaker unit 11 is mounted on a front panel of a cabinet 12 and radiates sound directly into the air. The speaker unit 11 is an electroacoustic transducer, and the cabinet 12 is placed on the table 13 in order to ensure sufficient bass output. At this time, the sound radiated by the speaker unit 11 is not influenced by the reflection of the peripheral structure, thereby avoiding extra sound dyeing and ensuring better sound quality.

Sometimes it is undesirable to look at the loudspeaker unit because of special requirements, such as appearance or structural requirements, where the loudspeaker unit does not radiate directly into the air but is reflected by the surrounding structural parts. As shown in fig. 2 and 3, the most typical design is that the speaker unit 21 is mounted on the lower panel of the cabinet 22, the speaker unit 21 radiates downward, and the sound is radiated to the reflecting structure. The reflective structure in this case may be a table top 23 as shown in fig. 2, or a part of a support member 24 of the enclosure 22 as shown in fig. 3, etc. However, such a reflection structure is often a flat design, has a simple structure, or has a large influence on the acoustic frequency of the system due to the directivity of the speaker unit, has a large coloration to the sound, and deteriorates the sound quality.

As shown in fig. 4, in order to improve the sound frequency response, one method is to add a conical rigid reflection cone 33 at a certain distance below the cone of the speaker unit 31 in the cabinet 32, so that the sound radiation of different frequencies is diffused by the irregular reflection of the reflection cone 33, and particularly, the high frequency part can be diffused more, thereby achieving the purpose of improving the sound frequency response.

Fig. 5 is a graph showing the comparison of sound frequencies before and after the addition of a reflection cone, where the ordinate is the sound pressure level and the abscissa is the sound frequency. It can be seen that the high frequency band of the acoustic sound is somewhat extended. However, the reflection of the rigid reflecting cone has different effects on different frequency sound components, resulting in uneven final audio frequency sound and coloration of subjective tone quality.

Disclosure of Invention

The invention aims to provide a sound structure which is used for further improving the sound frequency response and improving the sound quality.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows.

The utility model provides a sound structure, includes the audio amplifier, be equipped with speaker unit in the audio amplifier, speaker unit installs the following panel of audio amplifier still includes: the loudspeaker comprises a scattering shell positioned below the loudspeaker unit, a supporting structure connected below the scattering shell, and a connecting piece used for connecting the sound box and the supporting structure; the scattering shell is provided with at least one through hole, a cavity is formed between the scattering shell and the supporting structure in a surrounding mode, the cavity is communicated with the outside through the at least one through hole, and the cavity and the at least one through hole form a resonance sound absorption structure.

Optionally, the distance between the diffuser shell and the diaphragm of the loudspeaker unit is between 3mm and 30 mm.

Optionally, the scattering shell is a spherical shell and is fixedly connected to the upper surface of the support structure.

Optionally, the cavity is a hemispherical cavity formed between the scattering housing and the upper surface of the support structure.

Optionally, the cavity is filled with sound absorbing cotton.

Optionally, the volume of the sound-absorbing cotton in the cavity is between 50% and 70%.

Optionally, the connecting member includes a plurality of fixing rods, and the sound box is fixedly connected above the supporting structure through the plurality of fixing rods.

Optionally, the resonant frequency of the resonant sound absorption structure is the same as or close to the frequency of the maximum peak of the frequency response curve of the sound structure, so as to reduce the maximum peak by absorbing the sound component of the maximum peak, and make the frequency response curve flatter.

Optionally, the thickness of the scattering shell is between 2.5mm and 3.0mm, the number of the through holes is between 30 and 60, and the diameter of the through holes is between 1mm and 2 mm.

Optionally, the volume of the cavity is between 2ml and 4 ml.

According to the technical scheme, the embodiment of the invention has the following advantages:

the utility model provides a sound structure improves traditional reflection awl for the scattering casing of band-pass hole, and encloses between scattering casing and the supporting structure of below and close and form the cavity to constitute resonance sound absorption structure, this resonance sound absorption structure can absorb specific frequency's too much acoustic pressure component, with the peak value that reduces sound frequency response curve. Therefore, the design of the invention integrates sound diffusion and sound absorption structures, not only widens the high-frequency section of the audio frequency response, but also absorbs the energy of certain excessive frequencies, so that the audio frequency response is flatter, and the tone quality is improved.

Drawings

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the embodiment and the drawings used in the description of the prior art.

FIG. 1 is a schematic view of an acoustic structure in which a speaker unit is mounted on a front panel of a cabinet;

FIG. 2 is a schematic view of an acoustic structure in which a speaker unit is mounted on a lower panel of a cabinet;

FIG. 3 is a schematic view of an alternative acoustic structure in which the speaker unit is mounted on the lower panel of the cabinet;

FIG. 4 is a schematic diagram of an acoustic structure in which a speaker unit is mounted on a lower panel of a cabinet and has a reflection cone;

FIG. 5 is a schematic representation of an audio contrast of an acoustic structure with increased reflection taper;

FIG. 6 is a schematic diagram of an audio structure provided by an embodiment of the present invention;

FIG. 7 is an equivalent analogy diagram of the resonant sound absorbing structure of the sound structure of the embodiment of the present invention;

fig. 8 is a comparison of the sound improvement effect of the sound structure of the embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The following will explain details by way of specific examples.

Referring to fig. 6, an embodiment of the present invention provides an acoustic structure 60, which includes a sound box 61, a speaker unit 62 disposed in the sound box 61, the speaker unit 62 being mounted on a lower panel of the sound box 61; the acoustic structure 60 further includes: a diffuser housing 63 located below the speaker unit 62, a support structure 64 connected below the diffuser housing 63, and a connector 65 for connecting the cabinet 61 and the support structure 64.

Particularly, at least one through hole is formed in the scattering shell 63, a cavity 66 is formed between the scattering shell 63 and the supporting structure 64 in an enclosing mode, the cavity 66 is communicated with the outside through the at least one through hole, and the cavity 66 and the at least one through hole form a resonance sound absorption structure capable of absorbing sound with specific frequency.

In this embodiment, the sound box 61 may be a conventional sound box, such as a sound box made of wood or plastic or metal. The speaker unit 62 may be a conventional horn, such as a moving coil horn. A circular hole is formed in the lower panel of the sound box 61, and the diaphragm of the speaker unit 62 is mounted downward in the circular hole and makes a sound downward through the circular hole. The round hole can be covered with a dust screen.

In this embodiment, the enclosure 61 is mounted above the support structure 64 by a connector 65. Alternatively, the connecting member 65 may include a plurality of fixing rods, and the sound box 61 may be fixedly connected above the supporting structure 64 through the plurality of fixing rods.

In this embodiment, the supporting structure 64 is used to support the above components such as the sound box 61 and the scattering housing 63, and is used to connect and fix to other devices. Alternatively, the support structure 64 may be in the form of a cylinder or cube, for example, and the lower surface or sides thereof may be provided with threaded mounting holes or other link structures, for example, made of plastic, metal, wood, and other materials.

In this embodiment, in order to achieve better scattering and sound absorption effects, the scattering housing 63 may be a spherical housing, especially a spherical housing having the same or similar shape as the diaphragm of the speaker unit 62. Optionally, at least the vertex of the scattering shell 63 is spherical, and has no sharp vertex, and at least the vertex is provided with a through hole. It should be understood, however, that the diffuser shell 63 is not limited to a spherical shape, and may be conical or other shapes. The material of the scattering housing 63 can be, for example, plastic material or metal material, which is not limited herein. The diffuser shell 63 may be secured to the upper surface of the support structure 64 by glue bonding or the like.

In this embodiment, optionally, when the upper surface of the supporting structure 64 is a plane, and the scattering shell 63 is a spherical shell fixedly connected to the upper surface of the supporting structure 64, the cavity 66 is a hemispherical cavity formed between the scattering shell 63 and the upper surface of the supporting structure 64, and the hemispherical cavity has a good sound absorption effect.

In this embodiment, in order to achieve a better sound absorption effect, the cavity 66 may be filled with a sound absorption or damping material, such as a sound absorption cotton 67. Optionally, the volume percentage of the sound absorption cotton 67 in the cavity 66 can be between 50% and 70%, preferably 60%

In this embodiment, a distance between the scattering housing 63 and the diaphragm of the speaker unit 62 is at least greater than an amplitude of the diaphragm of the speaker unit 62, so as to avoid the diaphragm from touching the scattering housing 63 when vibrating. And the diffuser shell 63 should not be too far away from the speaker unit 62, for example, the distance between the two should not be smaller than the diameter or radius of the diaphragm of the speaker unit 62, for better sound scattering and reflection. Alternatively, in some possible implementations, the distance between the diffuser shell 63 and the diaphragm of the speaker unit 62 is preferably between 3mm and 30 mm.

In this embodiment, in order to achieve better effect, optionally, the thickness of the scattering shell 63 is between 2.5mm and 3.0mm, and preferably 2.8 mm; the number of the through holes is between 30 and 60, preferably 50, and the through holes are uniformly distributed on the surface of the scattering shell 63; the diameter of the through hole is between 1mm and 2mm, and preferably 1.5 mm; optionally, the volume of the cavity 66 is between 2ml and 4ml, preferably 3 ml.

In this embodiment, a certain distance is provided between the supporting structure 64 and the sound box 61, and sound channels are formed around the supporting structure. The sound emitted downwards from the speaker unit 62, a small part of the sound with specific frequency enters the resonance sound absorption structure to be absorbed, and most of the sound is scattered and reflected by the scattering shell 63 and then emitted to the periphery through the sound outlet channel.

In this embodiment, the resonant sound absorbing structure is configured to absorb sound components of a specific frequency. Preferably, the resonance frequency of the resonance sound absorption structure is the same as or close to the frequency of the maximum peak of the frequency response curve of the sound structure, so as to reduce the maximum peak by absorbing the sound component of the maximum peak, thereby making the frequency response curve flatter.

To better explain the principle of sound absorption, the sound absorbing structure may be equivalent to a structure as shown in fig. 7. Fig. 7 is a view equivalent to a duct in which a single or a plurality of through holes are formed, and when external sound reaches the sound absorbing structure through the duct, a sound component having the same resonance frequency as that of the sound absorbing structure is absorbed. The resulting attenuation can make the acoustic response flatter if its peak (peak point) corresponds exactly to this frequency.

The resonant frequency f of the sound absorbing structure is determined by the sound mass M of the duct and the sound volume C of the cavity, which are equivalent to one or more through holes, and the formula is as follows:

in practical application, the sound mass M can be adjusted by adjusting the thickness of the scattering shell and the aperture size of the through hole, the sound volume C is adjusted by adjusting the volume of the internal cavity, the resonance frequency of the resonance sound absorption structure is adjusted, and the frequency of the absorbed sound component is determined.

As shown in fig. 8, it is a comparison graph of the acoustic frequency response of the acoustic structure with the added reflection cone and the acoustic frequency response of the acoustic structure with the added scattering shell forming the resonant sound absorption structure of the present invention, and it can be seen from the graph that the acoustic frequency response curve of the acoustic structure with the added reflection cone has a higher peak point; the sound structure of the invention forms a resonance sound absorption structure by adding the scattering shell, and the sound component of the higher peak point of the sound frequency response curve is absorbed, so that the sound frequency response curve is flattened.

As described above, the acoustic structure of the present embodiment is such that a scattering case is disposed just below the diaphragm of the speaker unit as a scattering sound absorber. The scattering shell is provided with a through hole on the surface and a cavity inside to form a resonance sound absorption structure, and the resonance sound absorption structure consists of one or more through holes with certain length and a closed cavity or a semi-closed cavity connected with the through holes. The through hole can be equivalent to a conduit, the outer end of the conduit is connected with the outside air, and the inner end of the conduit is connected with the closed or semi-closed cavity. The through hole openings of the resonance sound absorption structure connected with the outside air can be positioned at the top of the scattering shell, and can also be positioned at other positions of the scattering shell and uniformly or non-uniformly distributed on the surface of the scattering shell. The scattering shell can be spherical or conical or other variant shapes close to a cone, such as a curve that a generatrix changes from a straight line to a circle, an exponential type and the like.

In the sound structure of the embodiment, in order to increase the sound absorption effect, a sound absorption or damping material may be added at the through hole or inside the cavity, and the sound absorption or damping material refers to a porous material which attenuates sound waves by a plurality of fine open pores from the surface to the inside, and mainly absorbs medium-high frequency sound waves, and various organic or inorganic fibers and products thereof with fibrous aggregation tissues, as well as open-cell foam plastics and expanded perlite products with porous structures. The materials can also be used in combination to enlarge the sound absorption range.

In summary, the invention discloses a sound structure. The invention adopts a design scheme which is an improvement on the basis of the existing sound structure with a reflecting cone, and mainly comprises an upper sound box, a middle scattering shell, a lower supporting structure and other components, wherein a loudspeaker unit of the upper sound box radiates sound downwards, the middle scattering shell is attached to the supporting structure, and the upper component and the lower component are connected and fixed through a connecting piece. The invention improves the reflecting cone into a scattering shell with a through hole, and the scattering shell can be a hemispherical shell and has the same or similar shape with the vibrating diaphragm of the loudspeaker unit. A cavity is arranged below the scattering shell and communicated with the outside through a through hole. The plurality of vias are in an acoustically parallel relationship. Because the through holes have certain diameters and lengths, a plurality of through holes can be equivalent to one guide pipe after being connected in parallel. The cavity and the through hole can jointly form a resonance sound absorption structure. The sound absorption structure can absorb excessive sound pressure components in the sound frequency response, so that flat sound frequency response is formed, and the sound quality is improved. The design integrates sound diffusion and a sound absorption structure, sound is uniformly diffused to the periphery, high-frequency response is extended, the high-frequency section of sound frequency response is widened, higher frequency of sound pressure can be absorbed, and excessive energy of certain frequency is absorbed, so that the sound frequency response is flatter, sound dyeing is reduced, and the sound quality is improved.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; those of ordinary skill in the art will understand that: the technical solutions described in the above embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A sound structure comprises a sound box, a loudspeaker unit is arranged in the sound box, the loudspeaker unit is arranged on the lower panel of the sound box, the sound structure is characterized in that,

further comprising: the loudspeaker comprises a scattering shell positioned below the loudspeaker unit, a supporting structure connected below the scattering shell, and a connecting piece used for connecting the sound box and the supporting structure; the scattering shell is provided with at least one through hole, a cavity is formed between the scattering shell and the supporting structure in a surrounding mode, the cavity is communicated with the outside through the at least one through hole, and the cavity and the at least one through hole form a resonance sound absorption structure.

2. Acoustic structure according to claim 1,

the distance between the scattering housing and the diaphragm of the loudspeaker unit is between 3mm and 30 mm.

3. Acoustic structure according to claim 1,

the scattering shell is a spherical shell and is fixedly connected to the upper surface of the supporting structure.

4. Acoustic structure according to claim 3,

the cavity is a hemispherical cavity formed between the scattering housing and the upper surface of the support structure.

5. Acoustic structure according to claim 1,

the cavity is filled with sound-absorbing cotton.

6. Acoustic structure according to claim 5,

the volume of the sound absorption cotton in the cavity is between 50% and 70%.

7. Acoustic structure according to claim 1,

the connecting piece comprises a plurality of fixing rods, and the loudspeaker box is fixedly connected above the supporting structure through the fixing rods.

8. Acoustic structure according to claim 7,

the resonance frequency of the resonance sound absorption structure is the same as or close to the frequency of the maximum peak value of the frequency response curve of the sound structure.

9. Acoustic structure according to claim 1,

the thickness of the scattering shell is between 2.5mm and 3.0mm, the number of the through holes is between 30 and 60, and the diameter of the through holes is between 1mm and 2 mm.

10. Acoustic structure according to claim 1,

the volume of the cavity is between 2ml and 4 ml.