CN208821075U - A kind of sounding monomer and sounding module - Google Patents

Abstract

The utility model discloses a kind of sounding monomer and sounding modules.The monomer includes vibrational system, centring disk includes centrally located central part and the edge part positioned at periphery, voice coil includes body part and lead, body part includes drawing side and free margins, lead on two extraction sides respectively by drawing, centring disk includes and draws at corresponding first, the second side corresponding with free margins, support portion include be located at two first in two upper the first cantilevers and when positioned at two second on the second cantilever, lead is drawn along the extending direction of the first cantilever and is fixedly connected with the first cantilever, one of them second while the second upper cantilever quantity less than another second while on the second cantilever quantity.

Description

A kind of sounding monomer and sounding module

Technical field

The utility model relates to electroacoustic switch technology fields, more particularly, to a kind of sounding monomer and sounding module.

Background technique

Existing loudspeaker, especially Microspeaker.Single-cantilever structure is mostly used on each side of centring disk.And it raises Sound device by dissymmetrical structure due to being influenced in the presence of polarization, such as acoustic aperture is located at side and causes to polarize after loudspeaker, after close Acoustic aperture side and separate rear acoustic aperture side amplitude are inconsistent.For another example sounding monomer is arranged on shell in sounding module In, hole of speaking is located at the side of sounding monomer.It is influenced by external vibration air-flow, sounding module has polarization, separate to speak The side amplitude of the side in hole and close acoustic aperture out is inconsistent.

Accordingly, it is desirable to provide a kind of new technical solution is to solve the above technical problems.

Utility model content

One purpose of the utility model is to provide a kind of new solution of sounding monomer.

It is according to the present utility model in a first aspect, providing a kind of sounding monomer.The monomer include magnetic circuit system and with The vibrational system that the magnetic circuit system matches, the vibrational system include centring disk made of voice coil and insulating materials, institute Stating centring disk includes centrally located central part and the edge part positioned at periphery, is led between the central part and the edge part Cross support portion connection, the voice coil is fixed on the central part along axial one end, wherein the voice coil include body part and Lead, the body part include two opposite extraction sides and two opposite free margins, and the lead is drawn by two respectively It is drawn on side, the centring disk includes drawing with two at corresponding two first, two corresponding with two free margins Second side, the support portion include be located at two first in two upper the first cantilevers and when positioned at two second on Second cantilever, the lead is drawn along the extending direction of first cantilever and is fixedly connected with first cantilever, wherein one A described second while upper second cantilever quantity less than another described second while on second cantilever quantity.

Optionally, the lead includes outlet and enters line, the outlet and it is described enter line with the geometry of the centring disk It is centrosymmetric centered on center, the outlet and enters at least partly sticking on two first cantilevers and passing through painting for line Glue is fixed.

Optionally, the length of the free margins is greater than the length for drawing side.

Optionally, the beginning of first cantilever and second cantilever is respectively positioned on the central part, and end is located at described Edge part, first cantilever and second cantilever are along pointer direction or extension counterclockwise.

Optionally, at least in the solid with the beginning of the connecting portion of first cantilever and end progress gluing of the lead It is fixed.

Optionally, the lead includes the curved portion close to the voice coil, and at least Hanging sectionally of the curved portion is in institute It states between the first cantilever and the edge part.

Optionally, the sounding monomer further includes shell, and the pad of the sounding monomer is moulded in the corner of the shell, The latter end of the lead is welded on the pad after being detached from the first cantilever.

Optionally, the latter end of the lead includes the overhanging portion between the first cantilever and pad.

Optionally, the centring disk is the single layer structure made of a material layer；Alternatively,

The centring disk is the multilayered structure being combined by multiple material layers or by multiple material layers and glue layer The material of the multilayered structure being combined, the multiple material layer is identical or different；

The material layer is made of high molecular polymer.

Optionally, the material of the material layer is polyimides, polyetherimide, polyether-ether-ketone, polyphenylene sulfide, thermoplasticity Any one in elastomer.

Other side according to the present utility model provides a kind of sounding module, including shell and above-mentioned sounding monomer, The sounding monomer is arranged in the shell.

Optionally, it is equipped with acoustic aperture on the side wall of the shell, described the on second side of acoustic aperture out The quantity of two cantilevers is less than the quantity of second cantilever far from second side for going out acoustic aperture.

Optionally, the quantity of second cantilever on separate second side of acoustic aperture out is two, close to out The quantity of second cantilever on second side of acoustic aperture is one.

Optionally, the one end for defining two the second sides is first end, and the other end is second end；Institute far from the acoustic aperture out State two second cantilevers on the second side, the central part on the beginning of one of them second cantilever and second side First end connection, end is connect with the middle part of the edge part on second side；The beginning of another second cantilever with The middle part of central part on second side connects, and end is connect with the second end of the edge part on second side；Close to institute State out described the second of acoustic aperture when the beginning of upper second cantilever is with described second on central part second end Connection, end is connect with the first end of the edge part on second side.

Optionally, the one end for defining two the first sides is third end, and the other end is the 4th end；Wherein one described first hangs One end of arm is connect with the third end of the central part on first side, the 4th end of the edge part on the other end and first side Connection；One end of another article of first cantilever is connect with the 4th end of the central part on first side, the other end with it is described The third end of the edge part on the first side connects.

According to one embodiment of the disclosure, the quantity of the second cantilever on one of them second side less than another second The quantity of the second cantilever on side.The quantity of second cantilever is fewer, then rigidity of the centring disk in the side is smaller, so that vibration Dynamic amplitude of the system in the side is bigger；The quantity of second cantilever is more, then rigidity of the centring disk in the side is bigger, so that Amplitude of the vibrational system in the side is smaller.

Can it is more that quantity be arranged according to actual needs in those skilled in the art on the biggish side of amplitude of sounding monomer Second cantilever inhibits the amplitude of the side to improve the rigidity of centring disk；Number is set on the lesser side of amplitude of sounding monomer Less second cantilever is measured, to reduce the rigidity of centring disk, promotes the amplitude of the side.Pass through above-mentioned set-up mode, sounding monomer Polarization be effectively suppressed.

By the detailed description referring to the drawings to the exemplary embodiment of the utility model, the utility model it is other Feature and its advantage will become apparent.

Detailed description of the invention

It is combined in the description and the attached drawing for constituting part of specification shows the embodiments of the present invention, and And together with its explanation for explaining the principles of the present invention.

Fig. 1 is the exploded view of the sounding monomer of one embodiment according to the present utility model.

Fig. 2 is the schematic diagram of the reverse side of the centring disk of one embodiment according to the present utility model.

Fig. 3 is the positive schematic diagram of the centring disk of one embodiment according to the present utility model.

Fig. 4 is the positive schematic diagram of another centring disk of one embodiment according to the present utility model.

Fig. 5 is the exploded view of the sounding module of one embodiment according to the present utility model.

Description of symbols:

10: centring disk；11: the first cantilevers；12: the second cantilevers；13: drawing side；14: free margins；15: central part；16: Edge part；17: curved portion；18: first end；19: second end；20: strengthening course；21: vibrating diaphragm；22: voice coil；23: vacancy section；24: Upper casing；25: shell；26: permanent magnet；27: lead；28: lower casing；29: sounding monomer；30:FPCB；31: damping piece；32: speaking Hole；33: third end；34: the four ends: 35: pad.

Specific embodiment

The various exemplary embodiments of the utility model are described in detail now with reference to attached drawing.It should also be noted that unless another It illustrates outside, the component and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments is unlimited The scope of the utility model processed.

Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to this is practical Novel and its application or any restrictions used.

Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable In the case of, the technology, method and apparatus should be considered as part of specification.

It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without It is as limitation.Therefore, other examples of exemplary embodiment can have different values.

It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.

One embodiment according to the present utility model provides a kind of sounding monomer.The sounding monomer 29 includes vibration system System and magnetic circuit system.As shown in Figs. 1-5, magnetic circuit system is used to form magnetic field.Magnetic circuit system includes permanent magnet 26 and conductive magnetic yoke.Forever Magnet 26 is fixed in conductive magnetic yoke, for example, being fixed by glue.In this example embodiment, during permanent magnet 26 includes centring magnet and surrounds The side magnet of heart magnet setting.Magnetic gap is formed between centring magnet and side magnet.On centring magnet and side magnet respectively It is provided with magnetic conductive board.Certainly, magnetic circuit system is not limited to the above embodiments, can be with other knots commonly used by setup cost field Structure.

Vibrational system includes voice coil 22, centring disk 10, vibrating diaphragm 21 and strengthening course 20.Centring disk 10 is by insulating materials system At.Centring disk 10 includes centrally located central part 15 and the edge part 16 positioned at periphery.Central part 15 and edge part 16 it Between pass through support portion connect.Support portion is capable of providing elastic anchorage force.Voice coil 22 is fixed on central part 15 along axial one end. For example, centring disk 10 is fixed on one end of the close vibrating diaphragm 21 of voice coil 22 or one end far from vibrating diaphragm 21.Voice coil 22 is inserted Enter in magnetic gap.Central part 15 is fixedly connected with the middle part of vibrating diaphragm 21.Strengthening course 20 is additionally provided at the middle part of vibrating diaphragm 21.Edge Portion 16 is fixed on the shell 25 of sounding monomer 29 or the side wall of the conductive magnetic yoke of magnetic circuit system.For example, being fixed by glue.With Material commonly used in the art can be selected in the glue of bonding.

Optionally, centring disk 10 is the single layer structure made of plastics or thermoplastic elastomer (TPE), for example, by PI (polyamides Imines), PEI (polyetherimide), PEEK (polyether-ether-ketone) or PPS (polyphenylene sulfide) be made.

It is also possible that centring disk 10 is the multilayered structure being combined by multiple material layers or is added by multiple material layers The multilayered structure that glue layer is combined.Wherein, material layer is plastics or thermoplastic elastomer (TPE).For example, by PI, PEI, PEEK and One of PPS or a variety of is combined.The elasticity of above-mentioned a variety of materials, good tolerance, density are small.

Optionally, the entirety of centring disk 10 is in rectangle or track type.Correspondingly, edge part 16 and central part 15 are in Rectangular ring or track type are cyclic annular.Edge part 16 and central part 15 are arranged concentrically.

As shown in Figure 1, voice coil 22 includes body part and lead 27.Body part includes opposite two extraction sides 13 and opposite Two free margins 14.Free margins 14 is the side that no lead 27 is drawn.Lead on two extraction sides respectively by drawing.Centering branch Piece includes drawing with two at corresponding two first, and two the second sides corresponding with two free margins.Lead 27 is logical Often by draw while 13 close centring disk 10 one end and be located at draw while 13 close corner position extraction.

Support portion include positioned at two first in two upper the first cantilevers 11 and when positioned at two second on second Cantilever 12.Lead 27 is drawn along the first cantilever 11 and is fixedly connected with the first cantilever 11.

The type of being in line, arc line shaped, wave linear shape etc. can be set at least one of first cantilever 11 and the second cantilever 12. Lead 27 is drawn along the extending direction of the first cantilever 11 and is fixedly connected with the first cantilever 11.Extending direction refers to the first cantilever 11 Trend substantially.First cantilever 11 can be parallel to the first side, can also be with the first side in the angle of setting.

In one example, gluing at least is carried out with the beginning of the connecting portion of the first cantilever 11 and end in lead 27 It is fixed.Lead 27 is including outlet and enters line.Gluing can be carried out at whole positions of the first cantilever 11 of process of lead 27 to fix； It is also possible to part progress dispensing to fix.But beginning and end must gluing, in this way, outlet and entering line and will not be hanged relative to first Arm 11 moves.This fixed form can be effectively prevented lead 27 and hit with centring disk 10, reduce sounding The noise of monomer 29.

In an example of the utility model, the quantity of the second cantilever 12 on one of them second side is less than another The quantity of the second cantilever 12 on second side.The quantity of second cantilever 12 is fewer, then rigidity of the centring disk 10 in the side is smaller, So that amplitude of the vibrational system in the side is bigger；The quantity of second cantilever 12 is more, then centring disk 10 is in the rigid of the side Degree is bigger, so that amplitude of the vibrational system in the side is smaller.

Can it is more that quantity be arranged according to actual needs in those skilled in the art on the biggish side of amplitude of sounding monomer Second cantilever 12 inhibits the amplitude of the side to improve the rigidity of centring disk；It is arranged on the lesser side of amplitude of sounding monomer The second cantilever of negligible amounts 12 promotes the amplitude of the side to reduce the rigidity of centring disk.Pass through above-mentioned set-up mode, sounding The polarization of monomer is effectively suppressed.

In addition, two the first support constructions are capable of providing the support force of auxiliary, position where preventing the first support construction Amplitude is excessive, to further suppress polarization.

In addition, lead 27 is along 11 cabling of the first cantilever, and is fixed on the first cantilever 11, can be effectively prevented in this way The broken string of lead 27.

In one example, outlet and enter line and be centrosymmetric centered on the geometric center of centring disk 10.Outlet and Enter at least partly sticking on two the first cantilevers 11 and fixing by gluing for line.For example, outlet and enter line by close to respectively The position in corner is oppositely extending after drawing, and is separately fixed on two the first cantilevers 11.Two corners that lead 27 is drawn Relatively.Centrosymmetric mode relative to by outlet and enter line drawn from same position or from same side draw, vibrational system Stiffness Distribution it is more balanced, thus more effectively inhibit polarization.

In one example, the length of free margins 14 is greater than the length for drawing side 13.In general, polarization occurs On the longer side of centring disk.The set-up mode of the embodiment can inhibit the polarization of the main portions of centring disk 10.

In one example, the beginning of the first cantilever 11 and the second cantilever 12 is respectively positioned on central part 15, and end is located at edge Portion 16.From the first cantilever 11 in terms of front perhaps reverse side and the second cantilever 12 along pointer direction or extension counterclockwise.First Cantilever 11 and the second cantilever 12 move towards identical, this makes the pliable consistent of each position of support portion, vibrate more balanced.

In one example, as shown in figure 4, lead 27 includes the curved portion 17 of the body part close to voice coil 22.Curved portion 17 at least Hanging sectionally is between the first cantilever 11 and edge part 16.For example, outlet and enter line extraction position formed arc Portion 17.Here, the length and radius of curvature of arc can be configured according to actual needs.Under normal conditions, the first cantilever 11 beginning is also arc.The radius of curvature of curved portion 17 should be greater than the beginning of the first cantilever 11, so that curved portion 17 can be empty Vacancy section 23 between the first cantilever 11 and edge part 16.The length of curved portion 17 is bigger, can be effectively reduced lead 27 Stress concentrate, prevent broken string, improve the reliability of sounding monomer 29.

In one example, sounding monomer 29 further includes cricoid shell 25.For example, shell 25 is in rectangular ring.Shell 25 are fixed on the permanent magnet 26 of magnetic circuit system.The pad 35 of sounding monomer 29 is moulded in the corner of shell 25.

For example, two pads 35 to be moulded in opposite two corner of shell 25 respectively by way of insert injection moulding. The latter end of lead 27 is welded on pad 35 after being detached from the first cantilever 11.Lead 27 is connected by pad 35 with external equipment. Pad 35 includes interior interconnecting piece and outer interconnecting piece.Lead 27 is welded on interior interconnecting piece.Outer interconnecting piece and external equipment contact Connection.Compared to directly lead is welded on external equipment, this mode makes the conducting of loudspeaker monomer and external equipment More easily.

In addition, the setting of pad 35 is in corner, convenient for operation, this makes the connection of sounding module and external equipment become to hold Easily.In one example, the latter end of lead 27 includes the overhanging portion between the first cantilever 11 and pad 35.Lead 27 Overhanging portion allows centring disk 10 to have vibration displacement amount appropriate.

Another embodiment according to the present utility model, provides a kind of sounding module.As shown in Figs. 1-5, sounding module Including shell and it is arranged in the intracorporal sounding monomer 29 of shell.In vibration, vibratory flow is generated in shell.Vibratory flow is to sounding The vibration of the vibrational system of monomer forms resistance.What two the second sides were located at sounding module makes sounding monomer be also easy to produce polarization Position.In this way, the generation that can effectively inhibit polarization improves the sound quality of sounding module.

In one example, acoustic aperture 32 is provided with out on the side wall of shell.The sounding module is that side is spoken formula, i.e. acoustic aperture out 32 are not located at just speaking on direction for sounding monomer 29.It is just speaking and is being oriented parallel to the direction of vibration of vibrational system.For example, going out The direction of acoustic aperture 32 is vertical with the direction of just speaking of sounding monomer 29.The device is the electronics such as sounding module, earphone, smartwatch Equipment.It is illustrated by taking sounding module as an example below.

Shell includes upper casing 24 and the lower casing snapped together with upper casing 24 28.Sounding monomer 29 is located at the accommodating chamber of shell In.Accommodating chamber is divided into first operatic tunes and second operatic tunes by sounding monomer 29.First operatic tunes is in communication with the outside by going out acoustic aperture 32. Magnetic circuit system is close to second operatic tunes.The rising tone is intracavitary to be filled with sound-absorbing material, for adjusting low-frequency effect.Upper casing 24 is additionally provided with The relief hole being connected to second operatic tunes.The lid of damping piece 31 closes on relief hole.Sounding monomer is connected by FPCB30 and external equipment It is logical.

In one example, as in Figure 2-4, the quantity far from the second cantilever 12 on the second side of acoustic aperture 32 out is two It is a.The quantity of the second cantilever 12 on the second side of acoustic aperture 32 out is one.The the quantity of the second cantilever 12 the more, feel relieved The structure of branch piece 10 is more complicated, and since installation space is limited, and the length of the second cantilever 12 can be smaller, this makes centring disk 10 vibration displacement amount can be smaller.Vibration displacement amount refers to the peak swing vibrated above and below that centring disk 10 allows.It should as far as possible Guarantee that the second cantilever 12 has enough length, to promote vibration displacement amount.

For example, centring disk 10 is integrally formed by modes such as punching press, injection moldings.In central part 15, edge part 16 and support Material is gone to handle between portion, to form vacancy section 23.

Certainly, the quantity of the second cantilever 12 on two the second sides can be multiple, as long as close to 32 side of acoustic aperture is gone out 12 quantity of the second cantilever it is few so that centring disk far from go out 32 side of acoustic aperture rigidity it is big.

It is also possible to not set second cantilever 12 on the second side for going out acoustic aperture 32, forms engraved structure；It is separate to speak One or more second cantilever 12 is set on second side in hole 32.It speaks in this way, being equally able to suppress the separate of vibrational system The amplitude of 32 side of hole reduces polarization.

In one example, as in Figure 2-4, the one end for defining two the second sides is first end 18, the other end second End 19.Far from two the second cantilevers 12 on the second side of acoustic aperture 32 out, the beginning and the second side of one of them the second cantilever 12 On central part 15 first end 18 connect, end is connect with the middle part of the edge part 16 on the second side.Another second cantilever 12 beginning is connect with the middle part of the central part 15 on the second side, and the second end 19 of the edge part 16 on end and the second side connects It connects.

Close to acoustic aperture 32 out second at the beginning of upper second cantilever 12 and second on central part 15 the The connection of two ends 19, end is connect with the first end 18 of the edge part 16 on the second side.

In above-mentioned set-up mode, the length of the second cantilever 12 on two the second sides can accomplish maximum, thus Keep the vibration displacement amount of centring disk 10 bigger, suitable for more powerful sounding monomer 29.

In one example, as shown in figure 4, the one end for defining two the first sides is third end 33, the other end is the 4th end 34.Wherein the third end 33 of the central part 15 on one end with the first side of first cantilever 11 is connect, the other end and the first side Edge part 16 the 4th end 34 connection.One end of another article of the first cantilever 11 and the 4th end 34 of the central part 15 on the first side Connection, the other end are connect with the third end 33 of the edge part 16 on the first side.In this example embodiment, the length of the first cantilever 11 can be done To maximum, to keep the vibration displacement amount of centring disk 10 bigger, suitable for more powerful sounding monomer 29.

Certainly, the connecting portion of the first cantilever 11 and the second cantilever 12 is not limited to the above embodiments, those skilled in the art It can be configured according to actual needs.

Although being described in detail by some specific embodiments of the example to the utility model, this field It is to be understood by the skilled artisans that example above merely to be illustrated, rather than in order to limit the scope of the utility model.This Field it is to be understood by the skilled artisans that can not depart from the scope of the utility model and spirit in the case where, to above embodiments It modifies.The scope of the utility model is defined by the following claims.

Claims (15)

1. a kind of sounding monomer, it is characterised in that: including magnetic circuit system and the vibrational system matched with the magnetic circuit system, The vibrational system includes centring disk made of voice coil and insulating materials, and the centring disk includes centrally located central part It with the edge part for being located at periphery, is connected between the central part and the edge part by support portion, the voice coil is along axial direction One end is fixed on the central part,

The voice coil includes body part and lead, and the body part includes two opposite extraction sides and two opposite freedom Side, for the lead respectively by drawing on two extraction sides, the centring disk includes two first corresponding with two extraction sides Side, two the second sides corresponding with two free margins,

The support portion include two the first cantilevers being located on two first sides and be located at two described second The second cantilever on side, the lead are drawn along the extending direction of first cantilever and are fixedly connected with first cantilever, One of them described second while upper second cantilever quantity less than another described second while on second cantilever Quantity.

2. sounding monomer according to claim 1, it is characterised in that: the lead includes outlet and enters line, the outlet With it is described enter line be centrosymmetric centered on the geometric center of the centring disk, the outlet and at least partly patch for entering line It leans against on two first cantilevers and is fixed by gluing.

3. sounding monomer according to claim 1, it is characterised in that: the length of the free margins is greater than the extraction side Length.

4. sounding monomer according to claim 1, it is characterised in that: the beginning of first cantilever and second cantilever It is respectively positioned on the central part, end is located at the edge part, and first cantilever and second cantilever are along pointer direction Or extend counterclockwise.

5. sounding monomer described in any one in -4 according to claim 1, it is characterised in that: at least the lead with The beginning of the connecting portion of first cantilever and end carry out gluing and fix.

6. sounding monomer described in any one in -4 according to claim 1, it is characterised in that: the lead includes close to institute The curved portion of voice coil is stated, at least Hanging sectionally of the curved portion is between first cantilever and the edge part.

7. sounding monomer described in any one in -4 according to claim 1, it is characterised in that: the sounding monomer further includes Shell, the pad of the sounding monomer are moulded in the corner of the shell, and the latter end of the lead is welded after being detached from the first cantilever It connects on the pad.

8. sounding monomer described in any one in -4 according to claim 1, it is characterised in that: the latter end of the lead includes Overhanging portion between the first cantilever and pad.

9. sounding monomer described in any one in -4 according to claim 1, it is characterised in that:

The centring disk is the single layer structure made of a material layer；Alternatively,

The centring disk is the multilayered structure or compound by multiple material layers and glue layer being combined by multiple material layers Made of multilayered structure, the material of the multiple material layer is identical or different；

The material layer is made of high molecular polymer.

10. sounding monomer according to claim 9, it is characterised in that: the material of the material layer is polyimides, polyethers Acid imide, polyether-ether-ketone, polyphenylene sulfide, any one in thermoplastic elastomer (TPE).

11. a kind of sounding module, it is characterised in that: the sounding including shell and as described in any one in claim 1-10 Monomer, the sounding monomer are arranged in the shell.

12. sounding module according to claim 11, it is characterised in that: it is equipped with acoustic aperture on the side wall of the shell, The quantity of second cantilever gone out on second side of acoustic aperture described in is less than described second far from the acoustic aperture out The quantity of second cantilever on side.

13. sounding module according to claim 12, it is characterised in that: far from second side of acoustic aperture out The quantity of second cantilever is two, and the quantity of second cantilever on second side of acoustic aperture out is one It is a.

14. sounding module according to claim 13, it is characterised in that: the one end for defining two the second sides is first end, The other end is second end；

Far from two second cantilevers on second side of acoustic aperture out, the beginning of one of them second cantilever It is connect with the first end of the central part on second side, end is connect with the middle part of the edge part on second side；It is another The beginning of a second cantilever is connect with the middle part of the central part on second side, the edge on end and second side The second end in portion connects；

Close to it is described go out acoustic aperture described second when the beginning of upper second cantilever is with described second on center The second end in portion connects, and end is connect with the first end of the edge part on second side.

15. sounding module according to claim 12, it is characterised in that: the one end for defining two the first sides is third end, The other end is the 4th end；

Wherein one end of first cantilever is connect with the third end of the central part on first side, the other end with it is described 4th end of the edge part on the first side connects；

One end of another article of first cantilever is connect with the 4th end of the central part on first side, the other end and described the The third end of the edge part on one side connects.