CN203840520U

CN203840520U - Audio device

Info

Publication number: CN203840520U
Application number: CN201320822401.6U
Authority: CN
Inventors: 黄新民
Original assignee: SHENGYA ELECTRONIC CO Ltd NINGBO
Current assignee: SHENGYA ELECTRONIC CO Ltd NINGBO
Priority date: 2013-12-12
Filing date: 2013-12-12
Publication date: 2014-09-17
Anticipated expiration: 2023-12-12

Abstract

An audio device comprises a voice coil and a vibration structure. The voice coil is in mutual exchange with a magnetic return system. The vibration structure comprises an upper suspension edge and a lower suspension edge, wherein the upper suspension edge is used for guaranteeing upward movement and upward displacement of the voice coil, and the lower suspension edge and the upper suspension edge are parallelly arranged to guarantee downward movement and downward displacement of the voice coil. When the voice coil moves upwardly and has an upward displacement, the lower suspension edge pulls the voice coil to return to an initial position. When the voice coil moves downwardly and has a downward displacement, the upper suspension edge pulls the voice coil to return to the initial position. Thus, the voice coil does reciprocating motions in a stable and linear mode.

Description

Audio unit

Technical field

The application relates to an audio unit, has particularly comprised the audio unit of two vibrational structures, thereby makes its displacement maximum and make its reciprocating motion stable, thereby has strengthened the sound quality of output.

Background technology

Existing audio unit, for example loud speaker, generally comprises a speaker frame, the vibrating diaphragm being supported by described speaker frame, the voice coil loudspeaker voice coil being coupled with described vibrating diaphragm, and a magnetic receipt unit with described voice coil loudspeaker voice coil electromagnetic induction, thereby order about described vibrating diaphragm vibration, thereby producing sound.Especially, described vibrating diaphragm is arranged on an opening part of described speaker frame, wherein, in the time that electromagnetic ground is induced described voice coil loudspeaker voice coil reciprocating motion, has correspondingly driven described vibrating diaphragm vibration.But the direction of vibration of described vibrating diaphragm is uncontrolled, thus the sound tonequality that described vibrating diaphragm can not reproduce.In order to obtain good sound tonequality, described vibrating diaphragm should be with the only reciprocally motion in one direction of uniform amplitude.For example, in the time that described vibrating diaphragm is flatly settled, described vibrating diaphragm should only vertically reciprocally move in (up and down) direction, and the displacement upwards of described vibrating diaphragm should be identical with the downward displacement of described vibrating diaphragm.

Centring disk conventionally by cotton with and staple fibre make, be generally disposed in described existing audio unit to control the direction of vibration of described vibrating diaphragm.Described centring disk has an inner edge that is coupled to described voice coil loudspeaker voice coil and an outside that is coupled to described speaker frame.The effect of described centring disk is to be supportedly used to provide stable elastic force, thereby keeps described voice coil loudspeaker voice coil and described vibrating diaphragm to turn back to their initial position.For example, in the time that described vibrating diaphragm moves to its uppermost position, the elastic force of described centring disk will pull described vibrating diaphragm to be back to its initial position.

Because described centring disk and described vibrating diaphragm are to be made from a variety of materials, described centring disk is namely different from described vibrating diaphragm elastic force.Especially, the elastic force of described vibrating diaphragm is the elastic force that is greater than described centring disk, thereby in the time that described vibrating diaphragm moves to its uppermost position, pulls described vibrating diaphragm to be back to its initial position.That is to say, in the time that described vibrating diaphragm is got back to its initial position, described vibrating diaphragm does not have downward motion.Described centring disk will only pull described vibrating diaphragm to get back to initial position from uppermost position downwards.In addition, due to the large elastic force of described centring disk, what described vibrating diaphragm was downward pulls the motion upwards of motion faster than described vibrating diaphragm.Result is that the reciprocating motion of described vibrating diaphragm is inhomogeneous in movement velocity.Because making described voice coil loudspeaker voice coil, described centring disk moves in nonlinear mode.Once described voice coil loudspeaker voice coil is not aimed at its central shaft motion, described voice coil loudspeaker voice coil may scratching to the inner side of described loud speaker.The protective finish of described voice coil loudspeaker voice coil will little by little be damaged.What is more important, the amplitude of described vibrating diaphragm is subject to the restriction of the elastic force that described centring disk is large.Especially for the audio unit that produces low-frequency sound, described vibrating diaphragm needs a relatively large amplitude reciprocally to vibrate.In other words, described centring disk will affect the reproduction of low-frequency sound.

For many slimline products that contain audio unit, for example, panel TV, cell phone, laptop computer, wishes that the described audio unit using is not only flat but also thin as much as possible, thereby makes its slimline product can maintain unique design and profile.Because described centring disk must be supported by the described loud speaker away from described vibrating diaphragm, the size of described loud speaker must be enough large, thereby provides enough spaces for the motion of described centering support.In other words, bulky audio unit can not design in these slimline products.

Summary of the invention

The utility model has the advantage of an audio unit is provided, it comprises two vibrational structures, thereby makes its displacement maximize and make it stablize reciprocating motion, thereby has strengthened the sound tonequality of output.

Another advantage of the present utility model is to provide an audio unit, and wherein said pair of vibrational structure guaranteed with the reciprocally motion in the axial direction of uniform amplitude, thus producing sound.

Another advantage of the present utility model is to provide an audio unit, and it is an audio unit without centring disk, and wherein said voice coil loudspeaker voice coil can stably move in one direction.

Another advantage of the present utility model is to provide an audio unit, and wherein said pair of vibrational structure guarantees reciprocally to move in linear axial mode, and reduces its transverse movement.

Another advantage of the present utility model is to provide an audio unit, and the vibration unit of wherein said pair of vibrational structure is identical, thereby guarantees that it is reciprocating motion.

Another advantage of the present utility model is to provide an audio unit, and wherein said pair of vibrational structure, for described audio unit provides better tonequality, improves durability, and tightening security property.

Another advantage of the present utility model is to provide an audio unit, the wherein said pair of vibrational structure need to be in described support minimum installing space, thereby described audio unit is applicable to be disposed at any slimline product.

Another advantage of the present utility model is to provide an audio unit, is wherein easy for the manufacture of the manufacturing step of described audio unit, thereby has not only lowered manufacturing cost but also efficient.

Another advantage of the present utility model is to provide an audio unit, and it designs without the original structure that changes described audio unit, thereby the manufacturing cost of the audio unit of being combined with described pair of vibrational structure is minimized.

Another advantage of the present utility model is to provide an audio unit, and wherein in the utility model, without using both expensive, labyrinth just can be realized above mentioned object.Therefore, the utility model successfully provides a cost-effective settling mode, and which provides the cramped construction for described audio unit, thereby strengthens the sound tonequality of its output.

According to the utility model, one audio unit can obtain described and other object and advantage above, described audio unit comprises a support frame, one electromagnetism hair tonic device, and a pair of vibrational structure, wherein said electromagnetism hair tonic device comprise a magnetic return system and one and described magnetic return the voice coil loudspeaker voice coil of system cross streams.

The described pair of vibrational structure comprises on one vibration unit and vibration unit once.Described lower vibration unit is by described support frame supports, and wherein said voice coil loudspeaker voice coil is coupled to the bottom side of described upper vibration unit.Described lower vibration unit is by described support frame supports and placed abreast with described upper vibration unit coaxially, wherein said voice coil loudspeaker voice coil extends through described lower vibration unit ground, to return system electromagnetic induction with described magnetic, wherein, described upper vibration unit and described lower vibration unit are with synchronously mode reciprocally motion in identical direction, respond the motion of described voice coil loudspeaker voice coil with this, thus producing sound.

According to other one side of the present utility model, the utility model also provides an audio unit, described audio unit comprises a support frame, an electromagnetism hair tonic device, wherein said electromagnetism hair tonic device comprise a magnetic return system and one and described magnetic return the voice coil loudspeaker voice coil of system cross streams.Described audio unit also comprises that one is coupled to the vibrational structure of described voice coil loudspeaker voice coil.

Described vibrational structure comprises outstanding limit on, this outstanding limit guarantees that described voice coil loudspeaker voice coil up moves and has displacement upwards, described vibrational structure also comprises outstanding limit, itself and described outstanding limit are settled abreast and are guaranteed described voice coil loudspeaker voice coil down to move and have downward displacement, wherein, in the time that described voice coil loudspeaker voice coil up moves to produce displacement upwards, described lower outstanding limit pulls described voice coil loudspeaker voice coil to be back to its initial position, wherein, in the time that described voice coil loudspeaker voice coil down moves to produce downward displacement, described outstanding limit pulls described voice coil loudspeaker voice coil to be back to its initial position, thereby described voice coil loudspeaker voice coil reciprocally moves in a stable mode.

According to other one side of the present utility model, the utility model also provides by a method of an audio unit audio reproduction, described audio unit comprises an electromagnetism hair tonic device, and include a pair of vibrational structure of vibration unit and lower vibration unit, wherein, described method comprises step below.

(1) produce electromagnetic force by described electromagnetism hair tonic device.Described electromagnetic force is by making a voice coil loudspeaker voice coil of described electromagnetism hair tonic device and a magnetic of the described electromagnetism hair tonic device system of returning respond to and produce mutually.

(2) when described voice coil loudspeaker voice coil is during by described electromagnetic force pulling upwards, guarantee that described voice coil loudspeaker voice coil moves upward and has to top offset, thereby up pull described upper vibration unit and lower vibration unit.

(3) when described voice coil loudspeaker voice coil by described electromagnetic force downward pull time, guarantee that described voice coil loudspeaker voice coil moves downward and has downward displacement, thereby down pull described upper vibration unit and lower vibration unit.

(4) driving described upper vibration unit and described lower vibration unit is with the reciprocally motion in identical direction of mode synchronously, responds the motion of described voice coil loudspeaker voice coil with this, thus producing sound.

According on the other hand of the present utility model, the utility model also provides the method for manufacturing an audio unit, and it comprises step below.

(A) form two identical vibration units with respectively as vibration unit on one and vibration unit once, wherein only have described lower vibration unit to there is a central hole.

(B) by described upper vibration unit be coupled to a support frame with described lower vibration unit, and described upper vibration unit is positioned on described lower vibration unit.

(C) be coupled the bottom side of a voice coil loudspeaker voice coil to described upper vibration unit, and to make described voice coil loudspeaker voice coil be the described central hole that extends through and be attached to described lower vibration unit.

(D) support the magnetic system of returning in a position and respond to described voice coil loudspeaker voice coil in order to electromagnetic ground, thereby drive the reciprocal motion of described voice coil loudspeaker voice coil, thereby described upper vibration unit and described lower vibration unit are with synchronously mode reciprocally motion in identical direction, respond the motion of described voice coil loudspeaker voice coil with this, thus producing sound.

Brief description of the drawings

Fig. 1 is according to a perspective view of an audio unit of a preferred embodiment of the present utility model.

Fig. 2 is the decomposing schematic representation according to the described audio unit of above preferred embodiment of the present utility model.

Fig. 3 is the cutaway view according to the described audio unit of above preferred embodiment of the present utility model.

Fig. 4 is the decomposing schematic representation according to two vibrational structures of the described audio unit of above preferred embodiment of the present utility model.

Fig. 5 is according to the perspective view of the audio unit of another preferred embodiment of the present utility model.

Fig. 6 is according to the decomposing schematic representation of the audio unit of above-mentioned another preferred embodiment of the present utility model.

Fig. 7 is the attached view according to the audio unit of above-mentioned another preferred embodiment of the present utility model.

Fig. 8 is the cutaway view along A-A line in Fig. 7.

Fig. 9 and Figure 10 are respectively the cutaway views of the distortion execution mode of the audio unit of above preferred embodiment.

Embodiment

Below describe and be used for disclosing the utility model so that those skilled in the art can realize the utility model.Preferred embodiment in below describing only as an example, it may occur to persons skilled in the art that other apparent modification.The general principle of the present utility model defining in the following description can be applied to other embodiments, deformation program, improvement project, equivalent and not deviate from the other technologies scheme of spirit and scope of the present utility model.

As shown in Figure 1 to Figure 4, according to the optimum embodiment of the utility model one for example understand an audio unit, wherein, audio unit described in the utility model can form as a loud speaker module or assembling with other audio units and form one loud speaker assemble body.

According to described optimum embodiment, described audio unit comprises support frame 10, one electromagnetism hair tonic devices 20, and a pair of vibrational structure being coupled mutually with described electromagnetism hair tonic device 20.The described pair of vibrational structure is that a dual vibrational structure is to provide dual vibrating effect.

Described support frame 10 comprises a upper frame 11, be coupled to a underframe 12 of described upper frame, and the basin frame 13 extending from described underframe to be to support described electromagnetism hair tonic device 20, wherein, described upper frame 11 and described underframe 12 support described pair of vibrational structure.Preferably, described upper frame 11 and described underframe 12 have identical square box shape.

Described support frame 10 further comprises to be provided at described upper frame 11 and described underframe 12 places in order to a mutual pinning chain unit 14 each other.As shown in Figure 2, described chain unit 14 comprises the multiple interlocks 141 that are arranged on respectively a bottom side of described upper frame 11 and a upside of described underframe 12, and be separately positioned on the multiple chain slot 142 of the bottom side of described upper frame 11 and the upside of described underframe 12, thereby in the time that described interlock 141 is coupled to described chain slot 142 respectively, described upper frame 11 and described underframe 12 are to lock with respect to one another.

Correspondingly, described interlock 141 and described chain slot 142 are to be mutually alternately arranged in described upper frame 11 and described underframe 12 everywhere.Described interlock 141 and described chain slot 142 be formed at described upper frame 11 bottom side two contrary positions and be formed on the two contrary positions of upside of described upper frame 12.For example, described upper frame 11 and described underframe 12 form square shape.Described interlock 141 is formed at two diagonal angle places of described upper frame 11 bottom sides and described chain slot 142 is formed at the other two diagonal angle places of described upper frame 11 bottom sides.Same, described interlock 141 is formed at two diagonal angle places of described underframe 12 upsides and described chain slot 142 is formed at the another two diagonal angle places of described underframe 12 upsides.Therefore, in the time that described interlock 141 is coupled to described chain slot 142 respectively, described upper frame 11 bottom sides will be pinned with described underframe 12 upsides, thus firm two vibrational structure.

Described electromagnetism hair tonic device 20 comprises that a magnetic returns system 21 and returns a voice coil loudspeaker voice coil 22 of system 21 cross streams with described magnetic, and wherein, the described basin frame 13 of described support frame 10 supports described magnetic and returns system 21.Thereby be energized and produce when an electromagnetic force when described magnetic returns system 21, reciprocally the moving in axially movable mode of described voice coil loudspeaker voice coil 22 electromagnetic induction, thus produce a vibration force at described pair of vibrational structure place.In other words, described electromagnetic force pulls forward described voice coil loudspeaker voice coil 22 to return described promotion voice coil loudspeaker voice coil 22, thereby drives described voice coil loudspeaker voice coil 22 reciprocally to move.

It is worth mentioning that audio unit described in the utility model can be placed on a vertical direction or a horizontal direction.When vertical direction is placed, described voice coil loudspeaker voice coil 22 is reciprocally to move along the direction of front and back, thereby described pair of driven (level) direction along front and back of vibrational structure reciprocally moved.When horizontal direction is placed, described voice coil loudspeaker voice coil 22 is reciprocally to move along upper and lower direction, thereby described pair of upper and lower (vertical) direction in the driven edge of vibrational structure reciprocally moved.For the ease of understanding, described audio unit of the present utility model is placed to describe by horizontal direction.

The described pair of vibrational structure comprise supported by described support frame 10 one on vibration unit 30 and vibration unit 40 once, wherein, described voice coil loudspeaker voice coil 22 is coupled to a bottom side place of described upper vibration unit 30.Especially, described upper vibration unit 30 and described lower vibration unit 40 are supported by described upper frame 11 and the described underframe 12 of described support frame 10 respectively.Correspondingly, described upper vibration unit 30 and described lower vibration unit 40 reciprocally move in mode synchronously in the same direction, and the motion of responding described voice coil loudspeaker voice coil 22 with this is for audio reproduction.

Especially, the middle on described between vibration unit 30 and described lower vibration unit 40 forms a center line, and it is symmetrical that wherein said upper vibration unit 30 and described lower vibration unit 40 are that relative described center line is.

The outstanding limit 32 that described upper vibration unit 30 comprises vibrating elements 31 on one and vibrating elements 31 extends to described support frame 10 from described, wherein said voice coil loudspeaker voice coil 22 is attached to a bottom side of described upper vibrating elements 31.Correspondingly, described vibrating elements 31 is plane loading elements with a predetermined thickness, and it is formed with flat top surface and a flat lower surface.In other words, the weight that described upper vibrating elements 31 reserves to described upper vibration unit 30 1 in advance, thereby reciprocally vibration or motion.

Described outstanding limit 32 vibrating elements 31 from described extends to the described upper frame 11 of described support frame 10.Correspondingly, an outside on described outstanding limit 32 is coupled to the inner edge place of described upper frame 11, and an inner edge on described outstanding limit 32 is coupled to an outside place of described upper vibrating elements 31.Be made up of elastomeric material on described outstanding limit 32, provides one first elastic force for described upper vibrating elements 31, thereby guarantee that described voice coil loudspeaker voice coil 22 is up move and have a displacement upwards.Thereby described outstanding limit 32 also provides one first restoring force to pull described voice coil loudspeaker voice coil 22 to return to its initial position.Described voice coil loudspeaker voice coil from its initial position move to Shangdi move to its above formed the maximum to top offset of described voice coil loudspeaker voice coil 22 when maximum position.In other words, described voice coil loudspeaker voice coil 22 is the maximum amplitude upwards of described voice coil loudspeaker voice coil 22 to top offset.

Preferably, described upper vibration unit 30 further comprises retaining component 33 on, and it extends integratedly from described outstanding limit 32 1 inner edges, and wherein, described upper vibrating elements 31 is the bottom sides that are embedded in described upper retaining component 33.

Described lower vibration unit 40 is placed coaxially abreast with described upper vibration unit 30, and wherein said voice coil loudspeaker voice coil 22 extends through in described lower vibration unit 40, to return system 21 electromagnetic induction with described magnetic.Correspondingly, described lower vibration unit 40 has a central hole 401, and wherein, described voice coil loudspeaker voice coil 22 extends through in and be attached to the described central hole 401 of described lower vibration unit 40.In other words, described voice coil loudspeaker voice coil 22 by the periphery of described central hole 401 accompanying and by around.

The outstanding limit 42 once that described lower vibration unit 40 comprises vibrating elements 41 and vibrating elements 41 extends to described support frame 10 from described, wherein, described central hole 401 is formed at described lower vibrating elements 41 places.Correspondingly, described lower vibrating elements 41 is also to have the thickness of reserving an in advance one plane loading element, and it is formed with flat top surface and a flat lower surface.In other words, the weight that described lower vibrating elements 41 reserves to described lower vibration unit 40 1 in advance, thereby reciprocally vibration or motion.

Described lower outstanding limit 42 vibrating elements 41 from described extends to the described underframe 12 of described support frame 10.Correspondingly, an outside on described lower outstanding limit 42 is coupled to the inner edge place of described underframe 12, and an inner edge on described lower outstanding limit 42 is coupled to an outside place of described lower vibrating elements 41.Be made up of elastomeric material on described lower outstanding limit 42, provides one second elastic force for described lower vibrating elements 41, thereby guarantee that described voice coil loudspeaker voice coil 22 is down move and have a downward displacement.Thereby described lower outstanding limit 42 also provides one second restoring force to pull described voice coil loudspeaker voice coil 22 to return to its initial position., formed the nethermost displacement of described voice coil loudspeaker voice coil 22 when described voice coil loudspeaker voice coil moves from its initial position the bottommost that down moves to it the position.In other words, the downward displacement of described voice coil loudspeaker voice coil 22 is downward maximum amplitudes of described voice coil loudspeaker voice coil 22.

Preferably, described lower vibration unit 40 further comprises retaining component 43, and it extends integratedly from described lower outstanding limit 42 1 inner edges, and wherein, described lower vibrating elements 41 is the upsides that are embedded in described lower retaining component 43.

Except forming described central hole 401 on described lower vibration unit 40, described upper vibration unit 30 and described lower vibration unit 40 are identical.In other words, described upper vibrating elements 31 and described lower vibrating elements 41 are that identical, different place is only that described central hole 401 is formed at described lower vibrating elements 41 places in shape and size.Described upper vibrating elements 31 and described lower vibrating elements 41 are to be made up of identical material.Described upper vibrating elements 31 and described lower vibrating elements 41 are formed at ring-type and align to ground coaxially to each other.Described upper vibrating elements 31 and described lower vibrating elements 41 are two rigid plate and are parallel to each other.Preferably, described upper vibrating elements 31 and described lower vibrating elements 41 are the intervals that mutually have living space, and described upper vibrating elements 31 is coupled to the top sides place of described voice coil loudspeaker voice coil 22, and described lower vibrating elements 41 is coupled to a pars intermedia office of described voice coil loudspeaker voice coil 22.A distance on described between vibration unit 30 and described lower vibration unit 40 will ensure that described voice coil loudspeaker voice coil 22 reciprocally moves in a stable mode.

The overall diameter of the diameter of described upper vibrating elements 31 and described lower vibrating elements 41 is identical.The interior diameter of described lower vibrating elements 41, such as, described center is a bit larger tham the diameter of described voice coil loudspeaker voice coil 22 through the diameter of slot 401.

Described in each, the diameter of upper vibrating elements 31 and described lower vibrating elements 41 further comprise that a reinforcement structure is in order to strengthen the hardness of diameter and described lower vibrating elements 41 of described upper vibrating elements 31.Correspondingly, described reinforcement structure comprises multiple circular gusset plates 311,411 are formed at the base of described upper vibrating elements 31 and the top of described lower vibrating elements 41 respectively coaxially, and multiple radially gusset plates 312,412 are formed at the base of described upper vibrating elements 31 and the top of described lower vibrating elements 41 radially.The hardness that described circular gusset plate 311,411 and described radially gusset plate 312,412 will be reinforced described upper vibrating elements 31 and described lower vibrating elements 41, to stop described upper vibrating elements 31 and described lower vibrating elements 41 in vibration processes Fracture or damage.

Described outstanding limit 32 and described lower outstanding limit 42 their shape and size except direction are separately also identical.Described outstanding limit 32 and described lower outstanding limit 42 are peripheries of being made and be formed on respectively described upper vibration unit 30 and described lower vibration unit by identical material.Especially, described outstanding limit 32 and described lower outstanding limit 42 are with respect to center line symmetry.Described outstanding limit 32 and described lower outstanding limit 42 are to be aligned in described voice coil loudspeaker voice coil 22 coaxially and to be disposed adjacent described support frame 10, thereby form and described voice coil loudspeaker voice coil 22 1 distance radially.Therefore, described upper vibrating elements 31 and described lower vibrating elements 41 can reciprocally move with maximum displacement.Described outstanding limit 32 and described lower outstanding limit 42 form arcuation in the opposite direction.

Described outstanding limit 32 has the structure of a reverse U shape and described lower outstanding limit 42 has the structure of a U shape.The cross section of the described reverse U shape on described outstanding limit 32 can make described voice coil loudspeaker voice coil 22 up move and have displacement upwards.The cross section of the described U shape on described outstanding limit 42 can make described voice coil loudspeaker voice coil 22 down move and have downward displacement.The highest point on described outstanding limit 32 is positioned on the upside of described upper frame 11, and the lowest part on described outstanding limit 42 is positioned under the bottom side of described upper frame 11.

When described voice coil loudspeaker voice coil 22 up moves and when to top offset, described lower outstanding limit 42 pulls described voice coil loudspeaker voice coil 22 to turn back to its initial position.Correspondingly, in the time that described voice coil loudspeaker voice coil 22 up moves, before described voice coil loudspeaker voice coil 22 is pulled back to its initial position by described lower outstanding limit 42, described lower outstanding limit 42 is also pulled upward and keeps described voice coil loudspeaker voice coil 22 in displacement upwards in a stable mode.

Correspondingly, described upper vibration unit 30 32 places, outstanding limit described provide described the first elastic force up to move to guarantee described voice coil loudspeaker voice coil 22, thereby drive the motion upwards of described upper vibrating elements 31.Meanwhile, described lower outstanding limit 42 is also up pulled, and by described lower vibrating elements 42, described the second restoring force puts on described voice coil loudspeaker voice coil 22.In other words, described second restoring force of described lower vibration unit 40 by firm described voice coil loudspeaker voice coil 22 from its initial position to the motion upwards of uppermost position.Once described voice coil loudspeaker voice coil 22 reaches uppermost position, described second restoring force of described lower vibration unit 40 will pull described voice coil loudspeaker voice coil 22 to be back to its initial position.

When described voice coil loudspeaker voice coil 22 down moves and when to bottom offset, described outstanding limit 32 pulls described voice coil loudspeaker voice coil 22 to turn back to its initial position.Correspondingly, in the time that described voice coil loudspeaker voice coil 22 down moves, at described voice coil loudspeaker voice coil 22, by before described, outstanding limit 32 is pulled back to its initial position, described outstanding limit 42 is also pulled down and keep described voice coil loudspeaker voice coil 22 in downward displacement in a stable mode.Result is that described voice coil loudspeaker voice coil 22 is reciprocally to move in a stable mode, thereby drives described upper vibration unit 30 and described lower vibration unit 40 with synchronously mode reciprocally motion in same direction.Described in it is worth mentioning that, displacement is upwards identical with described downward displacement.In other words, described voice coil loudspeaker voice coil 22 can be with amplitude peak upwards and downward maximum amplitude motion.

Correspondingly, described lower vibration unit 40 provides described the second elastic force down to move to guarantee described voice coil loudspeaker voice coil 22 at 42 places, described lower outstanding limit, thereby drives the downward motion of described lower vibrating elements 41.Meanwhile, described outstanding limit 32 is also down pulled, and by described upper vibrating elements 32, described the first restoring force puts on described voice coil loudspeaker voice coil 22.In other words, described first restoring force of described upper vibration unit 30 by firm described voice coil loudspeaker voice coil 22 from its initial position to the downward motion of lowest position.Once described voice coil loudspeaker voice coil 22 reaches lowest position, described first restoring force of described upper vibration unit 30 will pull described voice coil loudspeaker voice coil 22 to be back to its initial position.

In other words, when described voice coil loudspeaker voice coil 22 up moves, described vibrating elements 32 upwards leaves up motion from described center line, and described lower vibrating elements 42 up moves towards described center line.When described voice coil loudspeaker voice coil 22 down moves, described vibrating elements 32 upwards leaves down motion towards described center line, and described lower vibrating elements 42 leaves down motion from described center line.

It is worth mentioning that, when described upper vibration unit 30 and described lower vibration unit 40 are in reciprocating motion ground process, the described outstanding limit 32 of described upper vibration unit 30 will shift that described the first elastic force and described the first restoring force return and forward and described the second elastic force will be correspondingly shifted on the described outstanding limit 42 of described lower vibration unit 40 and described the second restoring force returns and forward.For example, described the second restoring force is switched to described the second elastic force and down moves in order to guarantee described voice coil loudspeaker voice coil 22 on the described lower outstanding limit 42 of described lower vibration unit 40.Simultaneously, described the first elastic force on described vibration unit 30 described 32 places, outstanding limit be switched to described the first restoring force in order to retain described voice coil loudspeaker voice coil 22 in stable mode in downward displacement, and after described voice coil loudspeaker voice coil 22 moves to downward displacement, pull described voice coil loudspeaker voice coil 22 to return to its initial position.

The operation of described audio unit comprises step below.

(1) produce electromagnetic force by described electromagnetism hair tonic device 20.When described magnetic returns system 21 while being energized, return system 21 by the described magnetic of electromagnetism hair tonic device 20 described in described voice coil loudspeaker voice coil 22 electromagnetic induction and produce electromagnetic force.In other words, return system 21 to described magnetic and input a signal of telecommunication.

(2), in the time that described electromagnetic force up promotes described voice coil loudspeaker voice coil 22, guarantee that described voice coil loudspeaker voice coil 22 moves upward and has to promote described upper vibration unit 30 to top offset with this and described lower vibration unit 40 up moves.Due to described electromagnetic force, described voice coil loudspeaker voice coil 22 is sensed and move.It is worth mentioning that, described outstanding limit 32 guarantees that described voice coil loudspeaker voice coil 22 up moves and has maximum displacement upwards.Step (2) further comprises step below.

(2.1) provide described the first elastic force up to move to guarantee described voice coil loudspeaker voice coil 22 by described upper vibration unit 30.Correspondingly, described outstanding limit 32 will produce the first elastic force and up move to ensure described voice coil loudspeaker voice coil 22, thereby promotes described vibrating elements 31 upwards.Meanwhile, described lower vibrating elements 41 also a synchronous mode up promoted.It is worth mentioning that, described lower outstanding limit 42 guarantees that described vibrating elements 41 is up promoted.

(2.2) by described lower vibration unit 40 produce described the second restoring force with keep described voice coil loudspeaker voice coil 22 in stable mode in displacement upwards and move and pull voice coil loudspeaker voice coil 22 to be back to its initial position after displacement upwards at described voice coil loudspeaker voice coil 22.Produce described the second restoring force by described lower outstanding limit 42, wherein, in the time that described lower vibrating elements 41 is also up promoted, described the second restoring force is little by little added to 42 places, described lower outstanding limit.Described the second restoring force will guide and keep the stably motion in a direction upwards of described lower vibrating elements 41.Especially, described the second restoring force described lower vibration unit 40 places by stop described on any undesired transverse movement of vibration unit 30, thereby described upper vibration unit 30 and described lower vibration unit 40 will stably move.Once described voice coil loudspeaker voice coil 22 moves with to top offset, described the first elastic force will reduce to minimum and described the second restoring force will increase to maximum.As a result, described voice coil loudspeaker voice coil 22 will down be pulled the initial position that is back to it.

(3), in the time that described voice coil loudspeaker voice coil 22 is down pulled by described electromagnetic force, guarantee that described voice coil loudspeaker voice coil 22 down moves and has downward displacement down to pull described upper vibration unit 30 and described lower vibration unit 40.Similarly, by described electromagnetic force, described voice coil loudspeaker voice coil 22 is sensed and move, and wherein, described lower outstanding limit 42 guarantees that described voice coil loudspeaker voice coil 22 down moves and has maximum to bottom offset.Step (3) further comprises step below.

(3.1) thus at described lower vibration unit 40 places, described the second restoring force being switched to described the second elastic force guarantees that described voice coil loudspeaker voice coil 22 down moves.

(3.2) vibration unit 30 places switch to described the first elastic force described the first restoring force and keep described voice coil loudspeaker voice coil 22 to bottom offset in stable mode on described, and after downward displacement, pull described voice coil loudspeaker voice coil 22 to be back to its initial position at described voice coil loudspeaker voice coil 22.

Correspondingly, because described outstanding limit 32 and described lower outstanding limit 42 are symmetrical, the elastic force and the restoring force that are produced by described outstanding limit 32 and described lower outstanding limit 42 are identical and produce in contrary direction.In the time that described upper vibrating elements 31 and described lower vibrating elements 41 up move, described outstanding limit 32 will produce elastic force and described lower outstanding limit 42 will produce restoring force.Same, in the time that described upper vibrating elements 31 and described lower vibrating elements 41 down move, described outstanding limit 32 will produce restoring force and described lower outstanding limit 42 will produce elastic force.In other words, described elastic force and described restoring force be described outstanding limit 32 and 42 places, described lower outstanding limit be mutually transferred respond with this described on the motion of vibrating elements 31 and described lower vibrating elements 41.

(4) drive continuously the reciprocally motion in identical direction in a synchronous manner of described upper vibration unit 30 and described lower vibration unit 40, respond the motion of described voice coil loudspeaker voice coil 22 with this, thus producing sound.When described upper vibration unit 30 and described lower vibration unit 40 are while moving constantly in reciprocal and synchronous mode, by described upper vibration unit 30 and described lower vibration unit 40, be input to the described signal of telecommunication that described magnetic returns system 21 and will be transformed into a voice signal.It is worth mentioning that, the reciprocating motion of described upper vibration unit 30 and described lower vibration unit 40 is synchronous, stable and linear, thereby strengthens the quality of output sound.Correspondingly, the linear movement of described upper vibration unit 30 and described lower vibration unit 40 is the modes with straight line, for example, and above-below direction or fore-and-aft direction.

It is worth mentioning that, described outstanding limit 32 is the identical with its displacement upwards to guarantee the downward displacement of described voice coil loudspeaker voice coil 22 of symmetry with described lower outstanding limit 42.Because described outstanding limit 32 and described lower outstanding limit 42 are to place with being separated from each other, described voice coil loudspeaker voice coil 22 can reciprocally move in a stable mode.

According to a preferred embodiment, a manufacture method of described audio unit comprises step below.

(A) form two identical vibration units.Correspondingly, vibration unit is used as described upper vibration unit 30 and another vibration unit is used as described lower vibration unit 40.Correspondingly, described two identical vibration units are to guarantee that with this described two vibration units are identical by identical swing die is made.Step (A) further comprises step below.

(A.1) form two vibrating elements 31,41 and from outwards radial two outstanding limits 32,42. of extending of described vibrating elements 31,41, form respectively described two vibration units by identical vibration unit mould.Correspondingly, each vibration unit 30,40 can be formed by mold injection by vibration unit mould.Described vibrating elements 31,41, it is a stiffener plate, can first be placed in the mould of described vibration unit.Then, the raw material on described outstanding limit 32,42 are injected in described vibration unit mould and form described outstanding limit 32,42 with this around at described vibrating elements 31,41.By using identical vibration unit mould, described two vibration units will be identical.It is worth mentioning that, described in one of them, vibration unit is be squeezed and become described lower vibration unit 40.

(A.2) another vibration unit of manufacturing described central hole 401 and do not have in order to form described lower vibration unit 40 described central hole at a described vibration unit place become described on vibration unit 30.Described vibration unit is placed in a drilling machine to form described central hole 401 thereon, thereby becomes described lower vibration unit 40.Preferably, described central hole 401 is circular ports, and its diameter is a bit larger tham the diameter of described voice coil loudspeaker voice coil 22.In other words,, except described lower vibration unit 40 has described central hole 401, described upper vibration unit 30 and described lower vibration unit 40 are identical.

(A') form described support frame 10, it comprises step below.

(A'.1) described support frame 10 is installed and is made it have described upper frame 11 and described underframe 12.Correspondingly, described upper frame 11 and described underframe 12 are to be made with this and guaranteed that described upper frame 11 and described underframe 12 are identical by identical frame mold.In other words, two frame bodies are to be made up of identical frame mold, and frame body forms described upper frame 11 and another frame body forms described underframe 12.Especially, a described frame body is overturn rapidly and is rotated with an angle oneself who presets, thereby forms described underframe 12.For example, two foursquare frame bodies are formed, and described lower frame support body 12 is reversed and is rotated 90 degree in order to respectively the described interlock 141 at described underframe 12 places and described chain slot 142 are matched with to described chain slot 142 and the described interlock 141 of described upper frame 11.Preferably, described upper frame 11 and described underframe 12 are to form by mold injection.

(A'.2) support described upper vibration unit 30 and described lower vibration unit 40 by described upper frame 11 and described underframe 12 respectively.

(A'.3) be mutually coupled to keep described upper vibration unit 30 and described lower vibration unit 40 in such position described upper frame 11 and described underframe 12, even if described upper vibration unit 30 and described lower vibration unit 40 are the distances of having living space each other.

(B) described upper vibration unit 30 and described lower vibration unit 40 are coupled to described support frame 10, and to make described upper vibration unit 30 be to be placed on described lower vibration unit 40.Correspondingly, the described outstanding limit 32 of described upper vibration unit 30 and described lower vibration unit 40,42 are coupled to described support frame 10, and described outstanding limit 42 vibrating elements 41 from described extends to described support frame 10 and described in another outstanding limit 32 vibrating elements 31 from described extend to described support frame 10.

Especially, described outstanding limit 32 vibrating elements 31 from described extends to the described upper frame 11 of described support frame 10.Described outstanding limit 42 vibrating elements 41 from described extends to the described underframe 12 of described support frame 10.Therefore, when described upper frame 11 and described underframe 12 are when chain each other, described upper vibration unit 30 and described lower vibration unit 40 are held in such position, and described upper vibration unit 30 is placed on the distance on described lower vibration unit 40 and on having living space with it.Preferably, described outstanding limit 32,42 is attached to described upper frame 11 and described underframe 12 by ultrasonic wave or adhesive.

(C) described voice coil loudspeaker voice coil 22 is coupled to the bottom side of described vibration unit 30, described voice coil loudspeaker voice coil 22 extends through and is attached to the described central hole 401 of described lower vibration unit 40.The top sides of described voice coil loudspeaker voice coil 22 can be attached to by adhesive the bottom side of described upper vibration unit 30.The limit of the surrounding of the described central hole 401 of described lower vibration unit 40 can be fixing by adhesive and described voice coil loudspeaker voice coil 22.

(D) support described magnetic and return system 21 to contact in electromagnetic induction with described voice coil loudspeaker voice coil 22, thereby drive described voice coil loudspeaker voice coil 22 reciprocally to move, thereby described upper vibration unit 30 and described lower vibration unit 40 are reciprocally motions in identical direction in a synchronous manner, and the motion of responding described voice coil loudspeaker voice coil 22 with this is in order to audio reproduction.Correspondingly, described magnetic returns system 21 and is supported by the described basin frame 13 of described support frame 10, thus in the time that described basin frame 13 is coupled to described underframe 12, described magnetic return that system 21 is alignd with described voice coil loudspeaker voice coil 22 and with its electromagnetic ground induction.

According to this preferred embodiment, described support frame 10 of the present utility model is modular with described pair of vibrational structure, thereby forms described audio unit with the manufacturing cost of minimumization and the manufacture process of summary.Because described upper vibration unit 30 and described lower vibration unit 40 are identical and are symmetrical, the motion of described voice coil loudspeaker voice coil 22 will be in one direction stably, thereby stop any undesired horizontal motion or the vibration of described voice coil loudspeaker voice coil 22.And described upper vibration unit 30 and described lower vibration unit 40 can reciprocally move up and down in linear mode for its initial position, the amplitude separately of described upper vibration unit 30 and described lower vibration unit 40 will be maximum.Therefore, described audio unit can be used for producing the voice signal of low frequency.Described vibrational structure also provides better tonequality for described audio unit, raising durable, and the fail safe of reinforcement and stoping is in operation, and it obtains any distortion of any part.

As shown in Fig. 5 to Fig. 8, be the audio unit according to another preferred embodiment of the present utility model, the audio unit in its structure and above preferred embodiment is similar, and difference is the shape difference of two vibrational structures.Particularly, in this preferred embodiment, two vibrational structures comprise supported by described support frame 10 one on vibration unit 30A and vibration unit 40A once, wherein, described voice coil loudspeaker voice coil 22 is coupled to the bottom side of described upper vibration unit 30A.Especially, described upper vibration unit 30A and described lower vibration unit 40A are supported by described upper frame 11 and the described underframe 12 of described support frame 10 respectively.Correspondingly, described upper vibration unit 30A and described lower vibration unit 40A reciprocally move in mode synchronously in the same direction, and the motion of responding described voice coil loudspeaker voice coil 22 with this is for audio reproduction.

The outstanding limit 32A that described upper vibration unit 30A comprises vibrating elements 31A on one and vibrating elements 31A extends to described support frame 10 from described, wherein said voice coil loudspeaker voice coil 22 is attached to the bottom side of described upper vibrating elements 31A.Described lower vibration unit 40A is placed coaxially abreast with described upper vibration unit 30A, and wherein said voice coil loudspeaker voice coil 22 extends through in described lower vibration unit 40A, to return system 21 electromagnetic induction with described magnetic.Correspondingly, described lower vibration unit 40A has a central hole 401A, and wherein, described voice coil loudspeaker voice coil 22 extends through in and be attached to the described central hole 401A of described lower vibration unit 40A.In other words, described voice coil loudspeaker voice coil 22 by the periphery of described central hole 401A accompanying and by around.The outstanding limit 42A once that described lower vibration unit 40A comprises vibrating elements 41A and vibrating elements 41A extends to described support frame 10 from described, wherein, described central hole 401A is formed at described lower vibrating elements 41A.

The shape of all parts of described pair of vibrational structure of the present utility model can arrange as required, for example in the above-described embodiments, the cross section of described upper vibrating elements 31 and described lower vibrating elements 41 (centre is central hole 401) is rounded, and described outstanding limit 32 and 42 cross sections, described lower outstanding limit are annular.Certainly, these parts also can be configured to other shapes, as triangle, and ellipse, and other polygons.For example, in this preferred embodiment, described upper vibrating elements 31A cross section is square, and there is the square of 401A of boring a hole at described lower vibrating elements 41AShi center.Correspondingly, being separately positioned on described upper vibrating elements 31A and described lower vibrating elements 41A upper outstanding limit 32A and lower outstanding limit 42A around can be square.

It is worth mentioning that, in the time being configured to square structure, observe the place of four corners, it is the most serious that outstanding limit is pullled, and the stroke of whole vibrating elements displacement is easy to be limited by the place in surrounding corner.Be restricted with regard to the space that makes oscillating plate upper and lower displacement like this, the movement travel of whole oscillating plate is corresponding being restricted also, and loud speaker can not get desirable low frequency audio.That is to say, because be not the circular configuration of above preferred embodiment, its power of pullling that is subject to various aspects in when vibration is homogeneous, and in square structure, the place of corner can not with other local synchronizing movings, reach maximum displacement.In this preferred embodiment of the present utility model, the 34A of peak place of the part of the corresponding corner of described outstanding limit 32A is higher than the plane at the 35A place, peak of the corresponding peripheral part of described outstanding limit 32A.For example, the plane at the 35A place, peak of the corresponding peripheral part of described outstanding limit 32A can be concordant with the surface of described upper frame 11, and the 34A of peak place of the part of the corresponding corner of described outstanding limit 32A is higher than the plane at the surperficial place of described upper frame 11.

That is to say, described outstanding limit 32A can form roughly arch, and the sagitta H of the part of the corresponding corner of described outstanding limit 32A is greater than the sagitta h of the corresponding peripheral part of described outstanding limit 32A, as shown in Figures 7 and 8.Similarly, described lower outstanding limit 42A can form roughly arch, and the sagitta of the part of the corresponding corner of described lower outstanding limit 42A is greater than the sagitta of the corresponding peripheral part of described lower outstanding limit 42A.So just can ensure corner and the peripheral part synchronously displacement in the vibration period of described outstanding limit 32A and described lower outstanding limit 42A, and synchronously reach maximum stroke.

Be another distortion execution mode of described pair of vibrational structure as shown in Figure 9, wherein said outstanding limit 32B is inverted U shape structure, and described lower outstanding limit 42B is also inverted U shape structure.Be another distortion execution mode of described pair of vibrational structure as shown in figure 10, described outstanding limit 32C and described lower outstanding limit 42C are coaxial, but can be arranged on same vertical direction, as shown in FIG..Like this, the size of the underframe 12C of described audio unit is reduced.That is to say, the external diameter of described underframe 12C can be less than the external diameter of described upper frame 11C, thereby the framework up and down of described audio unit can be configured to general conical or ladder-type structure.

One skilled in the art will understand that the embodiment of the present utility model shown in foregoing description and accompanying drawing only limits the utility model as an example and not.The purpose of this utility model is complete and realization effectively.Function of the present utility model and structural principle are shown in an embodiment and are illustrated, are not deviating under described principle, and execution mode of the present utility model can have any distortion or amendment.

Claims

1. an audio unit, is characterized in that, comprising:

One support frame;

One electromagnetism hair tonic device, it comprises that a magnetic returns system and the voice coil loudspeaker voice coil mutually exchanging with the described magnetic system of returning; And

A pair of vibrational structure, it comprises:

Vibration unit on one, it is supported by described support frame, and wherein said voice coil loudspeaker voice coil is coupled to described upper vibration unit; And

Vibration unit once, it is supported by described support frame and is placed abreast with described upper vibration unit, wherein, described voice coil loudspeaker voice coil extends through described lower vibration unit to return the induction of system electromagnetic ground with described magnetic, wherein, described upper vibration unit and described lower vibration unit are reciprocally motions in identical direction in a synchronous manner, respond the motion of described voice coil loudspeaker voice coil, thereby make audio reproduction with this.

2. audio unit as claimed in claim 1, it is characterized in that, described lower vibration unit comprises the vibrating elements with a central hole, and vibrating elements extends to the outstanding limit of described support frame from described, wherein said voice coil loudspeaker voice coil extends through in and is attached to the described central hole of described lower vibrating elements.

3. audio unit as claimed in claim 1, it is characterized in that, the outstanding limit that described upper vibration unit comprises vibrating elements on one and vibrating elements extends to described support frame from described, wherein, described voice coil loudspeaker voice coil is attached to a bottom side of described upper vibrating elements.

4. audio unit as claimed in claim 2, it is characterized in that, the outstanding limit that described upper vibration unit comprises vibrating elements on one and vibrating elements extends to described support frame from described, wherein, described voice coil loudspeaker voice coil is attached to a bottom side of described upper vibrating elements.

5. audio unit as claimed in claim 4, is characterized in that, described outstanding limit and described lower outstanding limit are symmetrical.

6. audio unit as claimed in claim 5, is characterized in that, described outstanding limit has an inverted U shape structure and described lower outstanding limit has U shape structure.

7. audio unit as claimed in claim 5, is characterized in that, described outstanding limit and described lower outstanding limit all have an inverted U shape structure.

8. audio unit as claimed in claim 6, is characterized in that, the diameter of described upper vibrating elements is identical with the overall diameter of described lower vibrating elements.

9. audio unit as claimed in claim 1, it is characterized in that, the underframe that described support frame comprises a upper frame and locks mutually with described upper frame, wherein, described upper vibration unit and described lower vibration unit are supported by described upper frame and described underframe respectively.

10. audio unit as claimed in claim 4, it is characterized in that, the underframe that described support frame comprises a upper frame and locks mutually with described upper frame, wherein, described upper vibration unit and described lower vibration unit are supported by described upper frame and described underframe respectively.

11. audio units as claimed in claim 8, it is characterized in that, the underframe that described support frame comprises a upper frame and locks mutually with described upper frame, wherein, described upper vibration unit and described lower vibration unit are supported by described upper frame and described underframe respectively.

12. audio units as claimed in claim 9, it is characterized in that, described support frame further comprises a chain unit that is arranged on described upper frame and described underframe, wherein said chain unit comprises and is arranged on respectively a bottom side of described upper frame and multiple interlocks of described underframe one upside, and be arranged on respectively the bottom side of described upper frame and the multiple chain slot of described underframe upside, thereby in the time that described interlock is coupled with described chain slot respectively, described upper frame and described underframe are to lock with respect to one another.

13. audio units as claimed in claim 10, it is characterized in that, described support frame further comprises a chain unit that is arranged on described upper frame and described underframe, wherein said chain unit comprises and is arranged on respectively a bottom side of described upper frame and multiple interlocks of described underframe one upside, and be arranged on respectively the bottom side of described upper frame and the multiple chain slot of described underframe upside, thereby in the time that described interlock is coupled with described chain slot respectively, described upper frame and described underframe are to lock with respect to one another.

14. audio units as claimed in claim 11, it is characterized in that, described support frame further comprises a chain unit that is arranged on described upper frame and described underframe, wherein said chain unit comprises and is arranged on respectively a bottom side of described upper frame and multiple interlocks of described underframe one upside, and be arranged on respectively the bottom side of described upper frame and the multiple chain slot of described underframe upside, thereby in the time that described interlock is coupled with described chain slot respectively, described upper frame and described underframe are to lock with respect to one another.

15. audio units as claimed in claim 11, is characterized in that, described upper frame and described underframe are identical.

16. audio units as claimed in claim 14, is characterized in that, described upper frame and described underframe are identical.

17. audio units as claimed in claim 14, is characterized in that, the shape on described outstanding limit and described lower outstanding limit is selected from the one in annular, side's annular, oval ring, triangular ring and polygon annular.

18. audio units as claimed in claim 17, is characterized in that, the shape side of the being selected from annular on described outstanding limit and described lower outstanding limit, and the cross section on described outstanding limit and described lower outstanding limit is arch, and the sagitta of the part of corner is greater than the sagitta of peripheral part.

19. audio units as claimed in claim 18, it is characterized in that, the peak place of the corresponding corner on described outstanding limit is higher than the plane at place, described upper frame surface, and the peak place of the corresponding peripheral part on described outstanding limit is substantially concordant with the plane at place, described upper frame surface.

20. audio units as claimed in claim 4, is characterized in that, described outstanding limit and described lower outstanding limit coaxially arrange.

21. audio units as claimed in claim 9, is characterized in that, the shape in the cross section of the structure that described upper frame and described underframe are combined is selected from the one being in cylindricality, taper and stairstepping.

22. 1 audio units, is characterized in that, comprising:

One support frame;

One vibrational structure, it is coupled to described voice coil loudspeaker voice coil, comprising:

Outstanding limit on one, in order to guarantee that described voice coil loudspeaker voice coil is up to move and have displacement upwards; And

Outstanding limit once, itself and described outstanding limit arrange abreast for guaranteeing described voice coil loudspeaker voice coil down to move has downward displacement, wherein, when described voice coil loudspeaker voice coil up moves and during in described displacement upwards, described lower outstanding limit pulls described voice coil loudspeaker voice coil to be back to its initial position, wherein, and when described voice coil loudspeaker voice coil down moves and during in described downward displacement, described outstanding limit pulls described voice coil loudspeaker voice coil to be back to its initial position, thereby described voice coil loudspeaker voice coil reciprocally moves in stable mode.

23. audio units as claimed in claim 22, it is characterized in that, before described voice coil loudspeaker voice coil is returned to its initial position by described lower outstanding limit, in the time that described voice coil loudspeaker voice coil up moves, described lower outstanding limit is up pulled, thereby stably keep described voice coil loudspeaker voice coil in the time of displacement upwards, wherein, at described voice coil loudspeaker voice coil by before described, outstanding limit is returned to its initial position, in the time that described voice coil loudspeaker voice coil down moves, thereby described outstanding limit is down pulled and stably keeps described voice coil loudspeaker voice coil in downward displacement.

24. audio units as claimed in claim 22, is characterized in that, described outstanding limit and described lower outstanding limit are symmetrical, thereby guarantee that the described downward displacement of described voice coil loudspeaker voice coil and the described displacement upwards of described voice coil loudspeaker voice coil are identical.

25. audio units as claimed in claim 23, is characterized in that, described outstanding limit and described lower outstanding limit are symmetrical, thereby guarantee that the described downward displacement of described voice coil loudspeaker voice coil and the described displacement upwards of described voice coil loudspeaker voice coil are identical.

26. audio units as claimed in claim 22, is characterized in that, described outstanding limit has an inverted U shape structure and described lower outstanding limit has U shape structure.

27. audio units as claimed in claim 22, is characterized in that, described outstanding limit and described lower outstanding limit have an inverted U shape structure.

28. audio units as claimed in claim 22, is characterized in that, described outstanding limit and described lower outstanding limit are to have distance on mutual space, in order to guarantee that described voice coil loudspeaker voice coil reciprocally moves in stable mode.

29. audio units as claimed in claim 27, is characterized in that, described outstanding limit and described lower outstanding limit are to have distance on mutual space, in order to guarantee that described voice coil loudspeaker voice coil reciprocally moves in stable mode.