CN206136281U - Miniature sounder - Google Patents

Abstract

The utility model discloses a miniature sounder relates to electro -acoustic products technical field, which comprises an outer shell, a vibration system and a magnetic circuit system are held in the housing, magnetic circuit includes the yoke, the border position of yoke is fixed with limit magnet and limit magnetic conduction board in proper order the position that magnetic circuit's the outside is close to limit magnet is equipped with leak protection magnetism part, the material of leak protection magnetism part is magnetic materials, the up end of leak protection magnetism part upwards no longer than the up end of limit magnetic conduction board, the lower extreme face down of leak protection magnetism part no longer than the lower terminal surface of yoke. The utility model discloses miniature sounder has solved the serious technical problem of miniature sounder side magnetic leakage among the prior art, the utility model discloses miniature sounder side magnetic leakage volume is little, can not produce other parts of portable electronic equipment and disturb, and waterproof performance is good simultaneously, and the reliability is high, long service life.

Description

Minitype acoustic generator

Technical field

The utility model is related to electro-acoustic product technical field, more particularly to a kind of minitype acoustic generator.

Background technology

Minitype acoustic generator is the important acoustic element of portable electric appts, for completing between electric signal and voice signal Conversion, be a kind of energy conversion device.Existing minitype acoustic generator includes vibrational system and magnetic circuit system, and magnetic circuit system includes Yoke, the center of yoke is fixed with successively the internal magnet and interior magnetic conductive board to form center magnetic path, the marginal position of yoke according to It is secondary be fixed with to be formed external magnetic circuit while magnet and while magnetic conductive board, magnetic gap, vibrational system are provided between center magnetic path and external magnetic circuit Voice coil loudspeaker voice coil be located at magnetic gap in.Because the outside of the side magnet of the minitype acoustic generator of this kind of structure is exactly directly minitype acoustic generator Shell, thus results in sidepiece leakage field seriously, as shown in fig. 6, and then other parts to portable electric appts produce interference, shadow The normal work of these parts is rung, the such as camera in mobile phone will be unable to realize focusing that serious reduces portable electronic The overall performance of equipment.

Utility model content

For disadvantages described above, technical problem to be solved in the utility model is to provide a kind of minitype acoustic generator, and this is miniature The side leakage field of acoustical generator is few, will not produce interference to other parts of portable electric appts, can lift portable electronic The overall performance of equipment.

To solve above-mentioned technical problem, the technical solution of the utility model is：

A kind of minitype acoustic generator, including shell, the inside the shell contains vibrational system and magnetic circuit system, the magnetic circuit system System includes yoke, the marginal position of the yoke be fixed with successively while magnet and while magnetic conductive board, in the outside of the magnetic circuit system Leakproof magnet assembly is provided near the position of side magnet, the material of the leakproof magnet assembly is permeability magnetic material, the leakproof magnet assembly Upper end face upwards upper surface less than the side magnetic conductive board, the lower end of the leakproof magnet assembly faces down less than the magnetic The lower surface of yoke.

Wherein, the leakproof magnet assembly is fitted on the side magnet, or the leakproof magnet assembly is molded in described outer In shell, and near the side in magnet be exposed to the shell and with it is described while magnet recline.

Wherein, highly equal, both consistencies from top to bottom of the height of the leakproof magnet assembly and the side magnet.

Wherein, the height of the leakproof magnet assembly is less than the height of the side magnet, and the leakproof magnet assembly is located at institute State between the upper and lower end face of side magnet.

As a kind of embodiment, the outer ledge in magnet with it is described while magnetic conductive board and the yoke outer side edges Edge is flushed.

As another embodiment, the magnetic conductive board when the outer ledge of magnet protrudes from described and the yoke Outer ledge.

Wherein, the magnetic circuit system is external magnetic circuit structure, also including the internal magnet of the center for being arranged on the yoke With interior magnetic conductive board；Or, the magnetic circuit system is external magnetic circuit structure, also arranges or is integrally disposed upon in the yoke including split The conducting magnetic column of heart position.

Wherein, the minitype acoustic generator also includes that with reference to the protecgulum held on the housing the protecgulum has side wall, institute The inner side for stating side wall lower ends face is recessed to form mounting groove, and the edge part of the vibrational system is placed in the mounting groove and thereon Surface is fixed on the bottom surface of the mounting groove, the lower surface of the outside in the side wall lower ends face and the vibrational system edge part It is common to fix on the housing.

Wherein, the outside in the side wall lower ends face is put down with the lower surface of the vibrational system edge part generally within same Face, between the upper surface of the vibrational system edge part and the bottom surface of the mounting groove, the outside in the side wall lower ends face and institute State and be adhesively fixed by glue-line between the lower surface of vibrational system edge part and the shell.

Wherein, the vibrational system includes vibrating diaphragm, and gasket ring is fixed with the downside of the vibrating diaphragm edge, the vibrational system Edge part includes the edge and the gasket ring of the vibrating diaphragm.

After employing above-mentioned technical proposal, the beneficial effects of the utility model are：

Because the side magnet outside of the utility model minitype acoustic generator is provided with the leakproof magnet assembly by made by permeability magnetic material, prevent Leakage field part changes the magnetic line of force distribution of side magnet sidepiece, and the magnetic line of force of opposite side magnet sidepiece is corrected, such as Fig. 6 and Tu Shown in 7, the leakage field of magnetic circuit system side is greatly reducing, so as to produce to the part of other in portable electric appts Interference, it is ensured that the normal work of these parts, improves the overall performance of portable electric appts.

Because protecgulum has side wall, the inner side in side wall lower ends face is recessed to form mounting groove, and the edge part of vibrational system is housed In mounting groove and its upper surface is fixed on the bottom surface of mounting groove, under the outside and vibrational system edge part in side wall lower ends face Surface is fixed on shell jointly.When the extraneous water of portable electric appts is entered in vibrational system from going out at acoustic aperture for protecgulum During the space of side, in the minitype acoustic generator of conventional structure, when bonding between the upper surface of the edge part of vibrational system and protecgulum During imprecision, the inside that water will enter into portable electric appts from the gap between the edge of vibrational system and protecgulum is empty Between, it is possible to the short circuit in electronic equipment can be caused, and is served stop in the utility model on the outside of the wall of protecgulum side and is made With while the lower surface of the outside in side wall lower ends face and vibrational system edge part is fixed on shell jointly, increasing and shell Bond area, increased the fastness and tightness of bonding, two road barriers are defined, even if the edge part of vibrational system is upper Bonding imprecision between surface and the bottom surface of mounting groove, can be effectively prevented by the sealing between side-wall outer side and shell Water is entered in electronic equipment inner chamber, and the width without increasing vibrating diaphragm edge can be good at realizing waterproof Performance, it is ensured that the vibration area of minitype acoustic generator, and then the utility model minitype acoustic generator is with preferable water resistance While also have higher acoustical behavior.

Due to being fixed with gasket ring on the downside of vibrating diaphragm edge, the edge and gasket ring of vibrating diaphragm are also secured in mounting groove.Gasket ring Supporting role is served to the edge of vibrating diaphragm so that the edge of vibrating diaphragm is more smooth, even if offering on the upper surface of shell The edge of the fair line groove vibrating diaphragm of voice coil leads also will not deform, so as to ensure that the edge of vibrating diaphragm and installing between groove bottom , will not there is bonding imprecision because of the out-of-flatness of vibrating diaphragm edge in the tightness of bonding, the bad of gap occur, further to improve The water resistance of minitype acoustic generator.

In sum, to solve minitype acoustic generator side leakage field in prior art serious for the utility model minitype acoustic generator Technical problem, the utility model minitype acoustic generator side magnetic flux leakage is little, and other parts of portable electric appts will not be produced Interference, while water resistance is good, reliability is high, long service life.

Description of the drawings

Fig. 1 is the structural representation of the utility model minitype acoustic generator embodiment one；

Fig. 2 is that the utility model minitype acoustic generator embodiment one removes protecgulum and the overlooking the structure diagram after vibrating diaphragm；

Fig. 3 is that the utility model minitype acoustic generator embodiment one removes the side structure schematic view after protecgulum；

Fig. 4 is the cross section structure diagram of the utility model minitype acoustic generator embodiment one；

Fig. 5 is the cross section structure diagram of the utility model minitype acoustic generator embodiment two；

Fig. 6 is the magnetic line of force distributed simulation figure of minitype acoustic generator of the prior art；

Fig. 7 is the magnetic line of force distributed simulation figure of the utility model minitype acoustic generator；

In figure：10th, shell, the 12, second hierarchic structure, 14, fair line groove, 20, protecgulum, 22, steel disc, 220, go out acoustic aperture, 24, Side wall, 30, vibrating diaphragm, 32, oscillating plate, 34, voice coil loudspeaker voice coil, 340, voice coil leads, 36, gasket ring, 40, yoke, 42, internal magnet, 44, interior lead Magnetic sheet, 46a, side magnet, 46b, side magnet, 48, side magnetic conductive board, the 480, first hierarchic structure, 50, leakproof magnet assembly.

Specific embodiment

With reference to the accompanying drawings and examples, the utility model is expanded on further.

The inner side being related in this specification refers to that outside refers to away from minitype acoustic generator near the side at minitype acoustic generator center The side at center；Refer to the orientation for being provided with vibrational system in the orientation being related to, the orientation for being provided with magnetic circuit system is referred under orientation.

Embodiment one：

As Fig. 1 and Fig. 4 jointly shown in, a kind of minitype acoustic generator, including shell 10 and combine the upper end of shell 10 protecgulum 20, contain vibrational system and magnetic circuit system in the space that shell 10 is surrounded with protecgulum 20.Magnetic circuit system is fixed on shell 10 Inner side, the edge part of vibrational system is fixed between the lower surface of the upper surface of shell 10 and protecgulum 20.

As shown in figure 4, magnetic circuit system includes yoke 40, yoke 40 is platy structure.The center of yoke 40 is solid successively Surely have internal magnet 42 and an interior magnetic conductive board 44, the marginal position of yoke 40 be fixed with while magnet 46a and while magnetic conductive board 48.Internal magnet 42 With interior magnetic conductive board 44 constitute magnetic circuit system internal magnetic circuit, while magnet 46a and while magnetic conductive board 48 constitute magnetic circuit system external magnetic circuit, it is interior Magnetic gap is provided between magnetic circuit and external magnetic circuit.While magnet 46a outer ledge with while magnetic conductive board 48 and yoke 40 outer ledge Flush, " the flushing " described in the present embodiment includes the complete situation in straight line under theoretical case, additionally includes Due to all parts exist tolerance or due to assembly precision not enough etc. caused by there is less dislocation.

In order to prevent the sidepiece leakage field of magnetic circuit, the utility model is in the outside of magnetic circuit system near the position of side magnet 46a Leakproof magnet assembly 50 is provided with, leakproof magnet assembly 50 is made up of permeability magnetic material, and the upper end of the leakproof magnet assembly 50 faces upwards and do not surpass The upper surface of side magnetic conductive board 48 is crossed, the lower end of leakproof magnet assembly 50 faces down less than the lower surface of yoke 40.Present embodiment In the material of preferably leakproof magnet assembly 50 be one kind in iron, mild steel or iron-based alloy, magnetic circuit system sidepiece can be changed The magnetic line of force is distributed, and side leakage field is reduced, referring to Fig. 6 and Fig. 7.

Used as a kind of specific embodiment, leakproof magnet assembly 50 can first pass through the technique laminating such as gluing and be fixed on side magnet On the side wall of 46a, the assembling with miscellaneous part is then completed.In addition, in order to reduce assembling difficulty, as a kind of preferred enforcement Mode, the leakproof magnet assembly 50 is first molded in inside the shell, and near while the side of magnet 46a be exposed to shell and with while magnet 46a reclines." reclining " described by the present embodiment includes the situation that leakproof magnet assembly 50 is contacted face-to-face with side magnet 46a, separately It is outer also to include due to reserved fit-up gap or due to the assembly precision caused situation that there is small gap such as not enough.

Although settings of the side magnet 46a in the short transverse in the outside of magnetic circuit system there can be various situations, for example, prevent The upper surface of leakage field part 50 and the upper surface of side magnetic conductive board 48 are substantially flush, lower surface and the upper surface of yoke 40 are substantially flush；Or The upper surface of person's leakproof magnet assembly 50 and the lower surface of side magnetic conductive board 48 are substantially flush, the lower surface of lower surface and yoke 40 is basic Flush；Or the height of leakproof magnet assembly 50 is highly equal with side magnet 46a, both flush up and down；Again or magnetic-leakage preventing portion The height of part 50 is slightly less than side magnet 46a, and leakproof magnet assembly 50 is located at the situation in the upper and lower end face of side magnet 46a.

But found by emulation experiment, although above-mentioned various situations have the effect for reducing magnetic leakage, however, it was found that anti- In the case that the lower surface of leakage field part 50 exceedes the continuation downwards of the upper surface of yoke 40, although magnetic-leakage preventing effect is being lifted, acoustics Can but reduce.And in the case that the upper surface of leakproof magnet assembly 50 continues up more than side magnetic conductive board lower surface, acoustical behavior exists Improve, but magnetic-leakage preventing effect is but being reduced.Therefore in order to ensure magnetic-leakage preventing effect and acoustical behavior simultaneously, preferred one has Body scheme is that the height of leakproof magnet assembly 50 is highly equal with side magnet 46a, and both flush up and down, " the flushing " described at this The same complete situation in straight line including under theoretical case, additionally include due to all parts exist tolerance or There is less dislocation caused by not enough waiting due to assembly precision, " equal " also including essentially equal under theoretical case, with And due to there is the caused approximately equalised situation such as tolerance, mismachining tolerance.

As shown in figure 4, protecgulum 20 has side wall 24, the inner side of the lower surface of side wall 24 is recessed into mounting groove, vibrational system Edge part be contained in mounting groove, and the upper surface of edge part is fixed on the bottom surface of mounting groove, the lower surface of side wall 24 it is outer The lower surface of side and vibrational system edge part is fixed on shell 10 jointly, wherein, upper surface and the peace of vibrational system edge part Pass through glue between the bottom surface of tankage, between the outside of the lower surface of side wall 24 and the lower surface and shell 10 of vibrational system edge part Layer is adhesively fixed.This kind of structure of the lower surface of protecgulum 20 can effectively improve the water resistance of minitype acoustic generator.

As shown in figure 4, vibrational system includes vibrating diaphragm 30, vibrating diaphragm 30 is fixedly arranged in the middle of oscillating plate 32, in present embodiment Oscillating plate 32 is fixed on the downside at the middle part of vibrating diaphragm 30, and the edge of oscillating plate 32 is fixed with voice coil loudspeaker voice coil 34, the end position of voice coil loudspeaker voice coil 34 In magnetic gap.Voice coil loudspeaker voice coil 34 does reciprocal cutting magnetic line fortune according to by the sound wave electric signal in its coiling in magnetic gap It is dynamic, so as to drive vibrating diaphragm 30 and the up-down vibration of oscillating plate 32, air sounding is instigated, realize the energy conversion between electroacoustic.Protecgulum 20 middle part injection is combined with steel disc 22, and steel disc 22 is provided with out acoustic aperture 220, and vibrating diaphragm 30 and oscillating plate 32 instigate what air sent Sound is from going out at acoustic aperture 220 to external radiation.

As Fig. 2, Fig. 3 and Fig. 4 jointly shown in, in present embodiment voice coil leads 340 from the upper end fair line of shell 10, in order to Avoid scalding the rubber fabric on shell 10 in 340 spot welding of voice coil leads, therefore correspondence voice coil loudspeaker voice coil draws on the upper surface of shell 10 The position of line 340 is provided with fair line groove 14, in order to anti-vibrating diaphragm 30 deforms downwards at fair line groove 14, in the edge of vibrating diaphragm 30 Lower section is fixed with a gasket ring 36, and gasket ring 36 is becket, and preferred gasket ring 36 is copper ring in present embodiment.The edge of vibrational system Portion includes the edge and gasket ring 36 of vibrating diaphragm 30, and the edge and gasket ring 36 of vibrating diaphragm 30 are contained in mounting groove jointly, wherein vibrating diaphragm 30 The upper surface at edge be bonded on the bottom surface of mounting groove, the lower surface of gasket ring 36 and the outside of the lower surface of side wall 24 generally within The outside of the lower surface of same plane, the i.e. lower surface of vibrational system edge part and side wall 24 is generally within same plane, gasket ring 36 lower surface and the outside of the lower surface of side wall 24 are bonded on the upper surface of shell 10 jointly, and the outer surface of gasket ring 36 with The side surface of mounting groove fits, and can further improve the water resistance of minitype acoustic generator.

As shown in figure 1, the apparent height that the position of side magnet 46a is fixed with yoke 40 is high less than the surface at other positions The middle part of degree, i.e. yoke 40 forms a boss structure, and boss structure opposite side magnet 46a plays position-limiting action, is prevented from Side magnet 46a inwardly offsets under the action of a magnetic force.

As shown in figure 1, the upper surface of side magnetic conductive board 48 is provided with the first hierarchic structure 480, it is located at the apparent height in outside Less than the apparent height positioned at inner side.The upper end of shell 10 extend internally along the upper surface in magnetic conductive board 48 and with while magnetic conductive board 48 upper surface fits, so as to define the second hierarchic structure 12 being adapted with the first hierarchic structure 480, can be effective Strengthen the bond strength between side magnetic conductive board 48 and shell 10, prevent magnetic circuit system from coming off from shell 10.

Embodiment two：

As shown in Fig. 2 present embodiment is essentially identical with embodiment one, its difference is：

The outer ledge of magnetic conductive board 48 and yoke 40 when the outer ledge of magnet 46b is protruded from, i.e., to the side of shell 10 To protrusion, the volume of side magnet 46b is bigger in present embodiment, can lift the BL (electromechanical coupling factors, by magnetic of minitype acoustic generator The magnetic flux density in gap and the effective length of voice coil loudspeaker voice coil coiling are determined), so as to reduce to other parts of portable electric appts Interference while improve the acoustical behavior of minitype acoustic generator.

This specification is only that the technical solution of the utility model is illustrated by taking the minitype acoustic generator of said structure as an example Illustrate, the technical solution of the utility model is not limited in the minitype acoustic generator of said structure in practical application, it can be applied It is provided with the minitype acoustic generator of side magnet in any one, for example, magnetic circuit system can also be external magnetic circuit structure, in yoke Heart position is not provided with centring magnet, but split arranges or be wholely set conducting magnetic column conducting magnetic column and side magnetic conductive board is formed between magnetic Gap.Elaboration of the those skilled in the art according to above-described embodiment, it is not necessary to which paying any performing creative labour just can be by this The technical scheme of utility model is applied in the minitype acoustic generator of other structures, therefore no matter whether the other structures of minitype acoustic generator It is identical with above-described embodiment, as long as the leakproof magnet assembly by made by permeability magnetic material is increased on the outside of the magnet of side, to The product for reducing side leakage field is each fallen within protection domain of the present utility model.

The name of the first hierarchic structure and the second hierarchic structure that are related in this specification is merely to difference technology is special Levy, do not represent position relationship therebetween, assemble sequence etc..

The utility model is not limited to above-mentioned specific embodiment, and one of ordinary skill in the art visualizes from above-mentioned Send out, without performing creative labour, a variety of conversion made, all fall within protection domain of the present utility model.

Claims (11)

1. minitype acoustic generator, including shell, the inside the shell contains vibrational system and magnetic circuit system, and the magnetic circuit system includes Yoke, the marginal position of the yoke be fixed with successively while magnet and while magnetic conductive board, it is characterised in that in the magnetic circuit system Outside is provided with leakproof magnet assembly near the position of side magnet, and the material of the leakproof magnet assembly is permeability magnetic material, the magnetic-leakage preventing The upper end of part faces upwards the upper surface less than the side magnetic conductive board, and the lower end of the leakproof magnet assembly faces down less than institute State the lower surface of yoke.

2. minitype acoustic generator according to claim 1, it is characterised in that the leakproof magnet assembly is fitted in the side magnet On.

3. minitype acoustic generator according to claim 1, it is characterised in that the leakproof magnet assembly is molded in the shell It is interior, and near the side in magnet be exposed to the shell and with it is described while magnet recline.

4. according to the arbitrary described minitype acoustic generator of claims 1 to 3, it is characterised in that the height of the leakproof magnet assembly with Highly equal, both consistencies from top to bottom of the side magnet.

5. according to the arbitrary described minitype acoustic generator of claims 1 to 3, it is characterised in that the leakproof magnet assembly it is highly little It is located between the upper and lower end face of the side magnet in the height of the side magnet, and the leakproof magnet assembly.

6. minitype acoustic generator according to claim 4, it is characterised in that the outer ledge in magnet with it is described while lead The outer ledge of magnetic sheet and the yoke is flushed.

7. minitype acoustic generator according to claim 4, it is characterised in that the outer ledge of the side magnet protrudes from described The outer ledge of side magnetic conductive board and the yoke.

8. according to the arbitrary described minitype acoustic generator of claims 1 to 3, it is characterised in that the magnetic circuit system is external magnetic circuit knot Structure, the also internal magnet including the center for being arranged on the yoke and interior magnetic conductive board；

Or, the magnetic circuit system is external magnetic circuit structure, and the yoke center is also arranged or be integrally disposed upon including split Conducting magnetic column.

9. according to the arbitrary described minitype acoustic generator of claims 1 to 3, it is characterised in that the minitype acoustic generator also includes knot The protecgulum that conjunction is held on the housing, the inner side that the protecgulum has side wall, the side wall lower ends face is recessed to form mounting groove, institute The edge part for stating vibrational system is placed in the mounting groove and its upper surface is fixed on the bottom surface of the mounting groove, the side The lower surface of the outside of wall lower surface and the vibrational system edge part is fixed on the housing jointly.

10. minitype acoustic generator according to claim 9, it is characterised in that the outside in the side wall lower ends face shakes with described The lower surface in dynamic system edges portion is generally within same plane, upper surface and the mounting groove of the vibrational system edge part Pass through between bottom surface, between the outside in the side wall lower ends face and the lower surface and the shell of the vibrational system edge part Glue-line is adhesively fixed.

11. minitype acoustic generators according to claim 10, it is characterised in that the vibrational system includes vibrating diaphragm, described to shake Gasket ring is fixed with the downside of film edge, the edge part of the vibrational system includes the edge and the gasket ring of the vibrating diaphragm.