CN212231669U - Elastic box body and sound box - Google Patents

Abstract

The utility model belongs to the technical field of the audio amplifier, especially, relate to an elasticity box and audio amplifier. The elastic box body comprises an outer box body forming a dynamic cavity, the outer box body comprises an elastic corrugated pipe with a hollow interior, the elastic corrugated pipe comprises a plurality of corrugated portions, each corrugated portion comprises at least two corrugated oblique walls and a flange portion connected between the two corrugated oblique walls, and the outer ends of the flange portions reach the wall thickness of the inner ends of the corrugated oblique walls from small to large to present an increasing state. The utility model discloses a when the elasticity box was applied to on the audio amplifier, can be so that when the audio amplifier product is miniaturized, can obtain good tone quality.

Description

Elastic box body and sound box

Technical Field

The utility model belongs to the technical field of the audio amplifier, especially, relate to an elasticity box and audio amplifier.

Background

Along with the acceleration of the pace of urban life, more and more people travel to travel, more and more exquisite with the product of hand-carrying also, small and exquisite, portable product is more and more gaining consumers' favor. However, portable products have some disadvantages, and because the products are small, the products have weaker performance than normal products. For the sound box, people want to make the volume of the sound box as small as possible, so that the sound box is convenient to carry and has sound quality.

To solve the above-mentioned problems of the conventional speaker, the basic concepts and principles of several electrical-vibration-acoustic conversion systems are first clarified:

1. loudspeaker unit baffle radiation (install on the baffle or on the audio amplifier, generally select hard material preparation, the sound wave of having eliminated loudspeaker unit cone place ahead radiation produces with the sound wave of cone rear radiation and interferes, sound short circuit has been avoided) the acoustic pressure that the vibration produced is directly proportional to the volume acceleration of cone, cone effective vibration area X vibration acceleration promptly, and cone vibration acceleration equals the square of cone vibration displacement X angular frequency, in other words, the low frequency is for medium-high frequency, more difficult radiation goes out.

2. The vibrating part of the loudspeaker unit has a resonant frequency, the resonant frequency is determined by two parts which play a spring role (providing compliance) and a mass block role, after the loudspeaker unit is arranged in the box body, air in the box body plays a role of an additional air spring, the resonant frequency of the original loudspeaker unit is increased, and the larger the box body is, the smaller the adverse effect is.

3. The non-linear distortion of the loudspeaker units is mainly generated by the hysteresis phenomenon generated by the restoring force of a supporting system for suspending the loudspeaker units, and is in direct proportion to the vibration displacement amplitude of a cone of the loudspeaker units, and under the condition of larger amplitude, all the loudspeaker units generate the characteristic of more or less non-linear distortion, which is shown in the output signal, and the signal components which do not exist in the input signal appear, and the expression form of the non-linear distortion of the loudspeaker units is as follows: limiting the acoustic output (small tones), producing audible distortion (murmurs), causing vibration instability (ring-strike), overload conditions (mechanical damage, burn-in).

4. The loudspeaker unit vibration system is composed of a cone, a voice coil and a centering support piece (damper), wherein the cone corrugated ring is connected with an iron basin support, a cone of the cone is connected with the voice coil, and the voice coil is connected with the centering support piece, so that a suspended support system is formed.

The loudspeaker unit utilizes the suspended support system to place the voice coil in the center of the magnetic gap, wherein, the suspended support system can generate a restoring force, the moving voice coil can move up and down in the magnetic gap in a balanced manner, the vibration displacement of the cone of the loudspeaker unit is obviously increased along with the increase of the electric power input to the voice coil, and the vibration displacement of the centering support plate is driven to be increased, when a certain limit is reached, because the cone bending ring and the centering support plate are made of rubber, foam and impregnated fabric, the material has internal loss, the restoring force of the suspended support system generates a hysteresis phenomenon, the relation between force and displacement is not applicable to Hooke law (namely F ≠ K (X)) any more, at the moment, the vibration system of the loudspeaker unit generates nonlinear distortion, even if the restoring force is eliminated, the voice coil can not return to the central position of the magnetic gap, thus, the number of turns of a cutting magnetic field is reduced, and the, the sound pressure output by the loudspeaker enters a nonlinear state, and distortion is obviously increased.

From the above, it can be seen that there are the following contradictions in the volume of the cabinet and the low frequency, and the main cause of nonlinear distortion of the speaker unit.

1. The speaker unit has a large diameter. To ensure the radiation sound pressure of the loudspeaker unit at low frequency, the effective vibration area or vibration displacement of the cone must be increased, and the increase of the vibration displacement will significantly cause the increase of the nonlinear distortion, so that the increase of the diaphragm area is the most reasonable way.

2. The volume of the speaker cabinet is large. The smaller the box body is, the higher the resonant frequency of the whole system is, and the low-frequency effect is poor, so that the volume of the box body needs to be as large as possible.

3. The main cause of the non-linear distortion of the speaker unit is due to hysteresis in the restoring force of the support system from which the speaker unit is suspended.

Of course, we can use a small cabinet (such as phase inversion design, passive unit, etc.) by some special design, but it is impossible to completely solve the contradiction between volume and low frequency, and the control of the loudspeaker unit distortion, such as the linearity problem of the restoring force of the suspension support system, can be better realized.

Under the drive of mobile phones and the internet, portable products are the inevitable trend of market demands. Therefore, it is highly desirable to optimize the existing portable sound box.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an elasticity box and audio amplifier, the audio amplifier that aims at solving among the prior art can't reach the low distortion with the expansion in-process at folding compression, when realizing the miniaturization, obtains the technical problem of good tone quality effect.

In order to achieve the above object, an embodiment of the present invention provides an elastic box, including the outer container that constitutes the dynamic cavity, the outer container includes inside hollow elastic bellows, elastic bellows includes a plurality of ripple portion, every ripple portion includes two at least ripple skew walls and connects in two flange portion between the ripple skew wall, ripple portion follows the outer end of flange portion extremely the wall thickness of the inner of ripple skew wall presents the increase state from little to big.

Optionally, the wall thickness of the corrugations ranges from 0.1mm to 1.6 mm.

Optionally, a gap is formed between two adjacent corrugated oblique walls of each corrugated portion, and the gap increases from the outer end of the flange portion to the inner end of the corrugated oblique wall from small to large.

Optionally, the gap is in the range of 0mm to 30 mm.

Alternatively, the flange portion may be a circular arc-shaped flange portion or an acute-angled flange portion.

Optionally, the length from one axial end of the elastic corrugated pipe to the other axial end of the elastic corrugated pipe is 20-400 mm; the width of the corrugated part of the elastic corrugated pipe is 10 mm-200 mm.

Optionally, the axial inner diameter of the elastic corrugated pipe is 5 mm-150 mm.

Optionally, the corrugated sloped wall is in the shape of a circular ring.

The embodiment of the utility model provides an above-mentioned one or more technical scheme in the elasticity box have one of following technological effect at least: the wall thickness of the corrugated part from the outer end of the flange part to the inner end of the corrugated inclined wall is increased from small to large, the direction of the force can be preset and the force can be changed through the wall thickness setting, so that the nonlinear distortion of the force vibration of the corrugated inclined wall can be reduced, the axial elastic force of the gradually-changed corrugated part is realized, and the axial linear motion of the elastic corrugated pipe is realized. Specifically, the thin (small wall thickness) flange part is easy to deform to generate elastic force, the force vibration passes through the inner end of the corrugated inclined wall from the outer end of the flange part, along with the gradual thickening (large wall thickness) of the wall thickness of the corrugated inclined wall, the force gradually becomes tough, so the axial support of the force is strengthened, simultaneously, along with the gradual change of the force of the corrugated part, the change of the amplitude displacement of the corrugated part is more uniform, the deformation stress distribution of the corrugated part is more uniform, the symmetry of the vertical vibration of the whole corrugated pipe is ensured, through the wall thickness arrangement, the nonlinear distortion of the vibration of the corrugated inclined wall force is effectively controlled, thereby the axial linear motion of the elastic corrugated pipe is realized, in this way, the force linearity generated by the corrugated part is good, the force can be directly and effectively applied to the inner cavity of the elastic box body to form the reverse power of the air elasticity applied to the cone at the back of the loudspeaker unit, and the cone, thus, the restoring action of the speaker unit supporting system is mainly performed by the elastic force of the air, so that the nonlinear distortion of the speaker unit vibration system can be reduced.

The utility model discloses another embodiment provides a sound box, including audio amplifier epitheca, audio amplifier inferior valve and speaker unit, the audio amplifier still includes foretell elasticity box, the elasticity box connect in the audio amplifier epitheca with between the audio amplifier inferior valve.

Optionally, the elastic box body further comprises an inner box forming a static cavity, and the inner box is arranged inside the elastic corrugated pipe and forms an expandable cavity together with the outer box; the loudspeaker unit is arranged in the inner box and is positioned in front of the static cavity formed by the inner box.

Optionally, one end of the inner box is connected with the sound box upper shell, the other end of the inner box is arranged in a suspended mode, and at least one air hole communicated with the outside air is formed in the inner box.

The embodiment of the utility model provides an above-mentioned one or more technical scheme in the audio amplifier have one of following technological effect at least: the utility model discloses a loudspeaker box, because use the above-mentioned elastic box body, through loudspeaker box epitheca, speaker unit, elastic bellows and loudspeaker box inferior valve, constitute a volume that has relative confined air cavity jointly, when the vibrational force of speaker unit acts on elastic bellows, the ripple portion deformation that sets up on the elastic bellows produces the power, the power is acted on and is aroused the air inflation to reduce in the cavity, form air elasticity, through changing the power that the ripple portion produced, thereby control the size of air elasticity in the elastic bellows, exert contrary power to the cone at speaker unit back, the cone axial reciprocating motion of supplementary promotion speaker unit, like this, speaker unit braced system restoring effect is mainly accomplished by the elasticity of air, thereby can reduce speaker unit vibration system's nonlinear distortion, when realizing the miniaturization of loudspeaker box product, good sound quality can be obtained.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a sound box provided by an embodiment of the present invention.

Fig. 2 is a cut-away view of the enclosure of fig. 1.

Fig. 3 is an enlarged view of a portion of a structure at a in fig. 2.

Fig. 4 is a schematic structural diagram of the elastic box provided in the embodiment of the present invention.

Fig. 5 is a sectional view of the elastic case of fig. 4.

Fig. 6 is a schematic structural view of another elastic box according to an embodiment of the present invention.

Fig. 7 is a sectional view of another elastic case of fig. 6.

Fig. 8 is a frequency response curve diagram of the speaker unit of the sound box provided by the embodiment of the present invention.

Fig. 9 is an impedance curve diagram of the speaker unit of the sound box provided by the embodiment of the present invention.

Fig. 10 is a frequency response curve diagram of the sound box provided by the embodiment of the present invention.

Fig. 11 is an impedance curve diagram of the sound box provided by the embodiment of the present invention.

Fig. 12 is a total harmonic distortion THD curve diagram of the speaker unit of the sound box provided by the embodiment of the present invention.

Fig. 13 is a total harmonic distortion THD curve diagram of the sound box provided by the embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

10-elastic case body 11-outer case 12-inner case

13-elastic bellows 14-bellows 15-first connection

16-second connecting part 20-upper sound box shell 30-lower sound box shell

40-protective side shell 50-loudspeaker unit 60-air vent

141-corrugated inclined wall 142-flange 151-first boss

152-first groove 161-second boss 162-second groove

H, wall thickness L, clearance.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1-13 are exemplary and intended to be used to illustrate embodiments of the present invention, and should not be construed as limiting the invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which is only for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In one embodiment of the present invention, as shown in fig. 3-5, a flexible enclosure 10 is provided that can be adapted for use in a sound box (see fig. 1 and 2). The elastic box body 10 comprises an outer box 11 forming a dynamic cavity, the outer box 11 comprises an elastic corrugated pipe 13 with a hollow interior, the elastic corrugated pipe 13 comprises a plurality of corrugated parts 14, each corrugated part 14 comprises at least two corrugated inclined walls 141 and a flange part 142 connected between the two corrugated inclined walls 141, and the wall thickness H of the corrugated part 14 from the outer end of the flange part 142 to the inner end of the corrugated inclined wall 141 is increased from small to large. In this embodiment, the corrugated portion 14 is flexible and elastic, and can be deformed. The outer end of the flange portion 142 is the left end as viewed in fig. 3, i.e., the end located outside the entire bellows portion 14, and the inner end of the inclined bellows wall 141 is one end located at the right side as viewed in fig. 3, i.e., the end located inside the entire bellows portion 14. The wall thickness H of the bellows portion 14 increases from the outer end of the flange portion 142 to the inner end of the bellows inclined wall 141, and is, for example, in a direction from the left side to the right side as shown in fig. 3.

In this embodiment, the wall thickness H of the corrugated portion 14 increases from the outer end of the flange portion 142 to the inner end of the inclined corrugated wall 141, and the direction of the force can be preset and the magnitude of the force can be changed by setting the wall thickness H, so as to realize the axial elastic force of the gradually changing corrugated portion 14, and thus, the axial linear motion of the elastic corrugated tube 13 is realized. Specifically, the thin (small wall thickness) flange part 142 is easy to deform to generate elastic force, the force vibration passes through the inner end of the corrugated inclined wall 141 from the outer end of the flange part 142, and along with the gradual thickening (large wall thickness) of the wall thickness H of the corrugated inclined wall 141, the force gradually becomes tough, so that the axial support of the force is strengthened, meanwhile, along with the gradual change of the force of the corrugated part 14, the change of the amplitude displacement of the corrugated part 14 is more uniform, the distribution of the deformation stress of the corrugated part 14 is more uniform, and the symmetry of the up-and-down vibration of the whole corrugated pipe 13 is ensured, through the arrangement of the wall thickness H, the nonlinear distortion of the force vibration of the corrugated inclined wall 141 is effectively controlled, so as to realize the axial linear motion of the elastic corrugated pipe 13, so that the force generated by the corrugated part 14 has good linearity, the force can directly and effectively act on the inner cavity of the elastic box body 10, and form air elasticity to, the cone of the speaker unit 50 is pushed to reciprocate in the axial direction, so that the restoring action of the supporting system of the speaker unit 50 is mainly performed by the elastic force of the air, thereby reducing the nonlinear distortion of the vibration system of the speaker unit 50.

In another embodiment of the present invention, as shown in fig. 3, the wall thickness H of the corrugated portion 14 ranges from 0.1mm to 1.6 mm. That is, the wall thickness H of the corrugated portion 14 is also gradually varied in a range of 0.1mm to 1.6 mm. By such a design, the elastic bellows 13 can obtain linear elasticity, realize axial movement, and ensure the reliability and the service life of the elastic bellows 13, and the structure and the related arrangement of the bellows finally reduce the distortion of the vibration system of the speaker unit 50 in the sound box to which the elastic box 10 is applied.

Preferably, the wall thickness H of the corrugations 14 ranges from 0.15mm to 0.85 mm.

In another embodiment of the present invention, as shown in fig. 3, a gap L is formed between two adjacent corrugated inclined walls 141 of each corrugated portion 14, and the gap L increases from the outer end of the flange portion 142 to the inner end of the corrugated inclined wall 141. A gap L is formed between two adjacent corrugated inclined walls 141, the gap L is in an increasing state from small to large, and the direction of the force gradually inclines towards the axial direction along with the increase of the gap L.

As shown in fig. 3 to 5, the upper and lower directions of fig. 4 or 5 are defined as the axial direction, the elastic corrugated tube 13 of the present embodiment includes a corrugated portion 14 which is hollow inside and can be folded and compressed or stretched along the axial direction, the hollow inside of the corrugated portion 14 forms a cavity, when the elastic corrugated tube is applied to a sound box, the hollow inside of the corrugated portion 14 can form an air elasticity, and the expansion and contraction of the air can be changed by folding the compressed or stretched corrugated portion 14 along the axial direction.

As shown in fig. 3, the corrugated portion 14 of the present embodiment includes at least two corrugated oblique walls 141, and because there is a gap L between two adjacent corrugated oblique walls 141, when folded and compressed, the two corrugated oblique walls 141 are obliquely attached in a manner that the walls are deformed to be straight; when the cabinet is unfolded, the two corrugated inclined walls 141 are separated in a way that the walls are deformed and bent, so that the two states of folding and compressing and unfolding of the corrugated part 14 are realized, and the outer box 11 of the dynamic cavity of the sound box is formed. The gap L between the two corrugated inclined walls 141 ensures that the corrugated inclined walls 141 can deform independently, causing expansion and reduction of air, and not interfering with each other.

Referring to fig. 2, the elastic casing 10 of the present embodiment can generate a force by an axial movement, and the force applied to the inside of the elastic casing 10 causes the expansion and contraction of air to form an air elastic force, and the clearance L between the two corrugated inclined walls 141 is gradually changed in the stretched state of the elastic casing 10, referring to fig. 3. The two corrugated inclined walls 141 are independently deformed, the deformed corrugated inclined walls 141 generate force, the size of air elasticity in the elastic box body 10 is controlled by changing the force, reverse power is applied to the cone at the back of the loudspeaker unit 50, the cone of the loudspeaker unit 50 is pushed to axially reciprocate in an auxiliary mode, and therefore the restoring effect of the supporting system of the loudspeaker unit 50 is mainly completed by the elasticity of the air, the nonlinear distortion of the vibration system of the loudspeaker unit 50 can be reduced, and a good tone quality effect is obtained while the loudspeaker box product is miniaturized.

Furthermore, the wall of the flange portion 142 extends to form two corrugated inclined walls 141, that is, the flange portion 142 is connected to the corrugated inclined walls 141, wherein the inner ends of the corrugated inclined walls 141 form a cavity volume of the hollow elastic corrugated tube 13, one of the corrugated inclined walls 141 is located above the flange portion 142, and the other corrugated inclined wall 141 is located below the flange portion 142, so as to form a support structure of the upper and lower double-layer elastic corrugated inclined walls 141 with a gap L, wherein a gap is formed between the two corrugated inclined walls 141, and the two corrugated inclined walls 141 are non-parallel wall surfaces.

Because the upper and lower double-layer elastic corrugated inclined wall 141 supporting body structure with the gap L, the corrugated part 14 plays a role of force push-pull, can provide good restoring force and fatigue resistance of force, when the elastic corrugated pipe 13 works under high power, the corrugated part 14 can bear the change and impact of instant force, the corrugated part 14 is not eccentric and does not swing left and right, the axial linear motion of the elastic box body 10 is ensured, and the nonlinear distortion of the force vibration of the corrugated inclined wall 141 is reduced, thus, the force loss generated by the corrugated part 14 is small, the force can be directly and effectively applied to the inner cavity of the elastic box body 10, the air elastic force is formed to apply reverse power to the cone at the back of the loudspeaker unit 50, the cone of the loudspeaker unit 50 is pushed to axially reciprocate, and thus, the restoring action of the supporting system of the loudspeaker unit 50 is mainly completed by the air elastic force, so that the nonlinear distortion of the vibrating system of the loudspeaker unit 50 can be reduced, and in combination with a gap L between two adjacent corrugated inclined walls 141, the gap L is in an increasing state from small to large, so that the corrugated part 14 can be ensured to have sufficient vibration displacement under the action of stress, the maximum amplitude of the axial movement of the corrugated part 14 is increased, and the sound box can bear high-power output.

Meanwhile, the gap L is formed between the corrugated inclined walls 141, so that the air elasticity in the cavity of the elastic corrugated pipe 13 can better pass through the air in the gap L and is transmitted to the paper cone at the back of the loudspeaker unit 50 more, and when the elastic corrugated pipe is applied to a sound box, the sound box product can be miniaturized and good tone quality can be obtained.

In another embodiment of the present invention, the gap L ranges from 0mm to 30 mm. Preferably, the gap L ranges from 3mm to 15 mm. The variation of the gap L of the corrugated slant wall 141 provides the elastic bellows 13 capable of realizing various air elasticity.

In the present embodiment, the elastic corrugated tube 13 is provided to be made of a thermoplastic resin material, that is, the corrugated portion 14 is made of a thermoplastic resin material. And may be made of Polyethylene (PE) or polyvinyl chloride (PVC), which may be better used to achieve the folding, compression and unfolding of the flexible bellows 13.

The flange 142 of the present embodiment is an arc-shaped flange 142. The arc-shaped flange part 142 is designed to be easy to deform, can provide a softer elastic force of the corrugated part 14, loose air density of the cavity, large air volume compliance and small stiffness of the cavity, and forms smaller air elastic force, so that the loudspeaker box has a better bass effect; the acute-angled flange 142 design is not prone to deformation, provides a relatively tough bellows 14 spring force, provides a tight chamber air density, provides a chamber air volume compliance that is low and stiffness that is high, provides a relatively high air spring force, and is relatively capable of withstanding high power. Meanwhile, the arc-shaped or acute-angle-shaped flange portion 142 is designed to be capable of being folded, compressed and unfolded quickly, and the sound waves are refracted and reflected at the arc-shaped or acute-angle-shaped flange portion 142, so that the timbre of the sound box has respective characteristic effects.

The flange portion 142 of the present embodiment effectively ensures that the inclined corrugated wall 141 has a corresponding compliant force when the corrugated portion 14 is in the working state, and ensures the elastic force of the corrugated portion 14.

The selection of the material of the elastic bellows 13, the shape of the inclined corrugated wall 141 and the flange 142 on the elastic bellows 13, and the wall thickness H of the inclined corrugated wall 141 are the main factors for changing the force, so that the elastic force of the elastic bellows 13 is controllable and changeable, and the elastic bellows 13 controls the axial movement of the elastic box body 10 by using the force, thereby finally realizing the expansion and contraction of the air in the box and forming the air elasticity.

In another embodiment of the present invention, the length from one axial end to the other axial end of the elastic corrugated tube 13 is 20mm to 400 mm; preferably, the length of the elastic bellows 13 from one end to the other end in the axial direction ranges from 50mm to 120 mm. The width of the corrugated part 14 of the elastic corrugated pipe 13 is 10 mm-200 mm; preferably, the width of the bellows 14 is 40mm to 100 mm. Within the length and width range, the elastic bellows 13 can obtain a sufficient air elasticity space, thereby obtaining a good timbre and tone quality effect.

In another embodiment of the present invention, the elastic bellows 13 is cylindrical, and the axial inner diameter of the cylindrical elastic bellows 13 is 5mm to 150 mm; preferably, the axial inner diameter of the elastic bellows 13 is 20mm to 80 mm. The elastic corrugated pipe 13 within the inner diameter range can better realize folding, compression and expansion while ensuring that the sound cavity has certain cavity volume, and is convenient to carry.

In another embodiment of the present invention, the corrugated sloped wall 141 is in a circular ring shape.

In another embodiment of the present invention, the elastic box body 10 further comprises an inner box 12 constituting a static cavity, the inner box 12 is disposed inside the elastic bellows 13 and constitutes an expandable cavity together with the outer box 11. In particular, the combination of the outer box 11 of the dynamic cavity and the inner box 12 constituting the static cavity achieves good sound quality.

Another embodiment of the present invention provides a sound box, including sound box upper casing 20, sound box lower casing 30 and speaker unit 50, the sound box still includes foretell elastic box 10, speaker unit 50 set up in inner box 12, just speaker unit 50 is located inner box 12 constitutes the place ahead of static cavity.

Further, the elastic box 10 further includes a first connection portion 15 and a second connection portion 16, the first connection portion 15 is disposed at one axial end of the elastic corrugated tube 13, and the first connection portion 15 is provided with at least one first boss 151 or a first groove 152 formed by bending and used for connecting with the sound box upper shell 20; the second connecting portion 16 is disposed at the other axial end of the elastic corrugated tube 13, and the second connecting portion 16 is provided with at least one second boss 161 or a second groove 162 which is formed by bending and is used for being connected with the lower speaker shell 30.

As shown in fig. 2, the inner box 12 of the present embodiment is provided with a cavity and a speaker unit 50, the speaker unit 50 is provided with a cone, the cavity is located behind the cone of the speaker unit 50, and the back of the cone is communicated with the air inside the cavity. The protective side shell 40, the upper enclosure 20 of the sound box, the loudspeaker unit 50 and the inner box 12 together form a carrier with a mass block, the gravity of the carrier is positioned at the axis of the elastic box body 10 and is vertical to the horizontal line, when the gravity of the carrier acts on the elastic corrugated pipe 13, the elastic corrugated pipe 13 deforms to generate force, and the force of the elastic corrugated pipe 13 can be changed by adjusting the weight of the protective side shell 40, the upper enclosure 20 of the sound box, the loudspeaker unit 50 or the inner box 12, so that the expansion and contraction of the air in the sound box are finally realized, and air elasticity is formed.

The utility model discloses the audio amplifier, the gas pocket 60 that sets up on the inner box 12 communicates with each other with the hollow cavity of elastic bellows 13, thus, the inner box 12, elastic bellows 13 constitutes the expanded cavity volume of a mutual intercommunication jointly, air in the inner box 12 promptly, can get into the bellows cavity through the gas pocket 60 that sets up, air in the bellows cavity, also can get into inner box 12 through gas pocket 60, set up the size of gas pocket 60 on the inner box 12 through the adjustment, quantity and length, the speed of control air business turn over inner box 12 cavity, change the size of air elasticity in the inner box 12 cavity, and thus, through the size of reasonable adjustment air elasticity, reverse power is applyed to the cone of speaker unit 50 back, supplementary cone axial reciprocating motion who promotes speaker unit 50.

The optional hard material preparation of inner box 12, it is preferred wooden, plastic or metal material, through taking the box design of baffle to speaker unit 50's cone front and back divided, the sound wave of the cone place ahead radiation of having eliminated speaker unit 50 produces with the sound wave of the cone rear radiation of speaker unit 50 and interferes, the sound short circuit has been avoided, and simultaneously, because inner box 12 chooses for use hard material to make, and it is located inside elastic bellows 13, the material is firm and intensity is higher, the tank wall keeps rigidity indeformable, constitute static cavity, can resist the pressure that the inside air vibration of elastic bellows 13 produced, play the resonance that restraines the box to a certain extent, make sound purer, it is clear.

The bottom of audio amplifier inferior valve 30 is provided with the rubber gasket, and the rubber gasket is for having elastomer material to make for eliminate the shake that elasticity box 10 elasticity transmitted to audio amplifier inferior valve 30 and arouse the audio amplifier, make the tone quality of audio amplifier purer, clear.

Another embodiment of the utility model provides a sound box, including audio amplifier epitheca 20, audio amplifier inferior valve 30 and speaker unit 50, the audio amplifier still includes foretell elasticity box 10, speaker unit 50 set up in inner box 12, just speaker unit 50 is located inner box 12 constitutes the place ahead of static cavity.

Specifically, the sound box of the present invention, because the above-mentioned elastic box 10 is used, a relatively closed air cavity volume is formed by the sound box upper shell 20, the speaker unit 50, the elastic corrugated tube 13 and the sound box lower shell 30, when the speaker unit 50 works, the vibration force acts on the elastic corrugated tube 13, the corrugated portion 14 disposed on the elastic corrugated tube 13 deforms to generate a gradual change corrugated portion 14 axial elastic force, the force acts on the cavity to cause the air to expand and contract, forming the air elastic force, the magnitude of the air elastic force in the elastic corrugated tube 13 is controlled by changing the force generated by the corrugated portion 14, the reverse power is applied to the cone at the back of the speaker unit 50, the cone of the speaker unit 50 is pushed to move back and forth in the axial direction, thus, the restoring effect of the speaker unit 50 supporting system is mainly accomplished by the air elastic force, thus, the nonlinear distortion of the vibration system of the speaker unit 50 can be reduced, and a sound box product can be miniaturized while obtaining excellent sound quality.

In the following embodiments, the working principle and beneficial effects of the elastic box 10 will be further explained by taking the elastic box 10 as an example when applied to a sound box:

as shown in fig. 2, fig. 4 and fig. 5, in another embodiment of the present invention, the first connecting portion 15 of the elastic box 10 is provided with at least one first protrusion 151 or first groove 152 formed by bending and used for connecting with the upper enclosure 20, that is, the first connecting portion 15 can be connected with the upper enclosure 20 by one or more first protrusions 151/first grooves 152; similarly, the second connecting portion 16 is provided with at least one second boss 161 or second groove 162 that is formed by bending and is used for connecting with the lower enclosure 30, that is, the second connecting portion 16 can be connected with the lower enclosure 30 by one or more second bosses 161/second grooves 162. For example, the structure that adopts boss or recess can be realized dismantling with the casing of audio amplifier through the cardboard and be connected, not only easy to assemble, also be convenient for the later stage moreover to the dismantlement of audio amplifier maintain and overhaul, of course, also can take glue adhesive mode adaptation in succession. In another embodiment of the present invention, a head port and a tail port are formed at both axial ends of the elastic case 10, and the head port and the tail port may be respectively formed on the first connecting portion 15 and the second connecting portion 16 and communicate with the hollow interior of the bellows portion 14.

In another embodiment of the present invention, one end of the inner box 12 is connected to the sound box top case 20, the other end of the inner box 12 is suspended, and the inner box 12 is at least provided with an air hole 60 communicating with the outside air. Because the audio amplifier adopts elasticity bellows 13 as audio amplifier outer container 11, audio amplifier inferior valve 30 or epitheca are provided with the through-hole that communicates bellows and outside, the through-hole plays the air business turn over effect, when not using, folding compression elasticity bellows 13 is to minimum length, make the audio amplifier reduce, like this, the power that elasticity bellows 13 deformation produced, by audio amplifier epitheca 20, the buckle locking that audio amplifier inferior valve 30 set up prevents to recoil, lie in audio amplifier epitheca 20 with elasticity bellows 13, in the space that audio amplifier inferior valve 30 constitutes, and is convenient for carry.

Another embodiment of the present invention provides a sound box, as shown in fig. 1-2, the sound box includes a sound box upper shell 20, a sound box lower shell 30 and the above elastic box body 10, one axial end of the elastic box body 10 is connected with the sound box upper shell 20, the other axial end of the elastic box body 10 is connected with the sound box lower shell 30, at least one of the sound box upper shell 20 and the sound box lower shell 30 is internally provided with a speaker unit 50, and the other one of the sound box upper shell 20 and the sound box lower shell 30 is provided with a circuit board, the circuit board is electrically connected with the speaker unit 50, wherein the circuit board and the speaker unit 50 are both in the prior art structure, and generally, components such as an IC chip, a lamp tube, a battery, an audio interface, a function key, and an electric wire are integrated on the circuit; the loudspeaker unit 50, the elastic box body 10, the sound box upper shell 20 and the sound box lower shell 30 jointly form an acoustic cavity, at least one of the sound box upper shell 20 or the sound box lower shell 30 is provided with a through hole for communicating the elastic box body 10 with the outside, and the through hole plays a role in air entering and exiting, so that the size of the acoustic cavity can be adjusted by folding and compressing or stretching the elastic box body 10.

In another embodiment of the present invention, as shown in fig. 2, the provided loudspeaker box further includes a protection side shell 40 connected to the loudspeaker box upper shell 20, wherein the protection side shell 40 is located on the peripheral side of the corrugated portion 14 and is used for protecting the corrugated portion 14 in the folded and compressed state. Specifically, when the bellows 14 is completely folded or partially folded, it is housed inside the protective side case 40, so that the bellows 14 can be protected by the protective side case 40. The protection-side shell 40 may be integrally formed with the sound box upper case 20, or the protection-side shell 40 may be detachably connected to the sound box upper case 20.

In another embodiment of the present invention, as shown in fig. 6 and 7, the elastic box 10 is square, the flange portion 142 is an acute-angled flange portion 142, and of course, the middle portion of the flange portion 142 can be provided with a lower groove or an upper boss, which has more diversified shapes, so that the tone of the sound box has more distinctive effects.

Taking the case that the elastic box body is applied to a sound box as an example, the impact of the elastic box body and the sound box on sound is explained through a CLIO electro-acoustic test analysis system and an actual test.

The test provides for 2.5 cun full frequency speaker unit 50, adorn an external diameter 90mm that comprises 8 ripple portions 14, height 115mm, axial internal diameter 70mm, the wall thickness of ripple portion 14 presents and increases for 0.12mm ~ 0.6mm, between two ripple inclined walls 141, the clearance 5mm ~ 12mm is progressively increased, flange portion 142 is the arc shape, in the sound box upper shell 20 of elasticity box 10 that Polyethylene (PE) material was made, the other end of elasticity box 10 passes through sound box lower shell 30 and connects, wherein speaker unit 50 uses the electric wire connection relevant circuit board, like this, constitute a sound box that has relative closed cavity volume.

As shown in fig. 9, in an embodiment of the present invention, a 2.5-inch full-range speaker unit 50 is shown, an impedance characteristic diagram in a free space state, where a resonant frequency FO: 120 HZ.

As shown in fig. 8, the frequency response curve of the speaker unit provided in the embodiment of the present invention mainly reflects the sound radiation of the speaker unit 50 in the free space state.

Fig. 10 is a frequency response curve diagram of the sound box according to the embodiment of the present invention, when the elastic box 10 is applied to the sound box, the sound radiation in the cavity space formed by the speaker unit 50 and the elastic box 10 is mainly reflected. As can be seen from this, when the speaker unit 50 is mounted on the elastic casing 10, the frequency response curve of sound is changed due to the influence of the corrugated structure of the casing shape.

Fig. 11 is a graph showing an impedance curve of the sound box according to the embodiment of the present invention, and it can be seen that when the speaker unit 50 is mounted on the elastic case 10, the resonance frequency of the speaker unit 50 is increased due to the use of the miniaturized case.

Fig. 12 is the total harmonic distortion THD curve diagram of the speaker unit provided by the embodiment of the present invention, and it can be seen from this that, under the free space state of the speaker unit 50, in the effective bandwidth, the total harmonic distortion THD of the speaker unit 50 has reached 7% at most, and particularly near the resonant frequency 120HZ, the amplitude of the cone increases, and the jump occurs more easily, and near the frequency 7KHZ, the jump has also occurred in the middle-high frequency part, and the distortion is serious.

Fig. 13 is a total harmonic distortion THD curve diagram of the sound box provided in the embodiment of the present invention, and it can be seen from this that, when the elastic box 10 is applied to the sound box, in the effective bandwidth, the total harmonic distortion THD of the sound box is less than or equal to 3.5%, and the distortion is well controlled.

Through the above measured data as reference, it can be seen that, the sound box of the present invention, because the above elastic box body 10 is used, through the sound box upper shell 20, the speaker unit 50, the elastic corrugated tube 13 and the sound box lower shell 30, a relatively closed air cavity volume is formed jointly, when the speaker unit 50 works, the vibration force acts on the elastic corrugated tube 13, the corrugated portion 14 arranged on the elastic corrugated tube 13 deforms, a gradual change corrugated portion 14 axial elastic force is generated, the force acts on the cavity to cause the air expansion and reduction, forming the air elastic force, the air elastic force applies the reverse power to the cone at the back of the speaker unit 50, the cone of the speaker unit 50 is pushed to move back and forth in the axial direction, thus, the restoring effect of the support system of the speaker unit 50 is mainly accomplished by the elastic force of the air, thereby the nonlinear distortion of the vibration system of the speaker unit 50 can be reduced, therefore, the sound box product is miniaturized, and good tone quality can be obtained.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (11)

1. An elasticity box, its characterized in that: including constituting the outer container of dynamic cavity, the outer container includes inside hollow elasticity bellows, the elasticity bellows includes a plurality of ripple portion, every ripple portion includes two at least ripple skew walls and connects in two flange portion between the ripple skew wall, ripple portion follows the outer end of flange portion extremely the wall thickness in the inner of ripple skew wall presents the increase state from little to big.

2. The elastic case of claim 1, wherein: the wall thickness of the corrugated part ranges from 0.1mm to 1.6 mm.

3. The elastic case of claim 1, wherein: and a gap is formed between every two adjacent corrugated inclined walls of each corrugated part, and the gap is increased from the outer end of the flange part to the inner end of each corrugated inclined wall from small to large.

4. The elastic case of claim 3, wherein: the range of the gap is 0 mm-30 mm.

5. The elastic case of claim 1, wherein: the flange part is an arc-shaped flange part or an acute-angle-shaped flange part.

6. The elastic case of claim 1, wherein: the length from one axial end of the elastic corrugated pipe to the other axial end of the elastic corrugated pipe is 20-400 mm; the width of the corrugated part of the elastic corrugated pipe is 10 mm-200 mm.

7. The elastic case of claim 1, wherein: the axial inner diameter of the elastic corrugated pipe is 5 mm-150 mm.

8. The elasticity box of any one of claims 1 ~ 7, its characterized in that: the corrugated inclined wall is in a circular ring shape.

9. A sound box comprises an upper sound box shell, a lower sound box shell and a loudspeaker unit, and is characterized in that the sound box further comprises an elastic box body according to any one of claims 1 to 8, and the elastic box body is connected between the upper sound box shell and the lower sound box shell.

10. The loudspeaker of claim 9, wherein: the elastic box body also comprises an inner box forming a static cavity, and the inner box is arranged in the elastic corrugated pipe and forms an expandable cavity together with the outer box; the loudspeaker unit is arranged in the inner box and is positioned in front of the static cavity formed by the inner box.

11. The acoustic enclosure of claim 10, wherein: one end of the inner box is connected with the upper sound box shell, the other end of the inner box is arranged in a suspended mode, and at least one air hole communicated with outside air is formed in the inner box.

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