CN1554210A - An electro-acoustic transducer with two diaphragms - Google Patents
An electro-acoustic transducer with two diaphragms Download PDFInfo
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- CN1554210A CN1554210A CNA02817691XA CN02817691A CN1554210A CN 1554210 A CN1554210 A CN 1554210A CN A02817691X A CNA02817691X A CN A02817691XA CN 02817691 A CN02817691 A CN 02817691A CN 1554210 A CN1554210 A CN 1554210A
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- barrier film
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
- H04R9/063—Loudspeakers using a plurality of acoustic drivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/006—Interconnection of transducer parts
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/046—Construction
Abstract
The present invention relates to an electro-acoustic transducer suitable for applications within mobile communication equipment and hearing aids. The transducer comprises two diaphragms positioned on opposite sides of a magnetic circuit having two magnetic gaps. When used as a microphone the transducer is substantially insensitive to vibrations, and when used as a speaker the transducer generates only very low vibration levels. The magnetic circuit has a number of advantages compared to conventional transducers with circular magnetic. The transducer can be made lightweight and with very compact dimensions compared to conventional designs. In a preferred embodiment the diaphragms are rectangular. The transducer may additionally be used as a vibration generator for silent alarm signals.
Description
Technical field
The present invention relates to an a kind of electric acoustical convertor, especially a kind of electric power transducer with two barrier films, above-mentioned each barrier film can both carry an electric lead coil that can move in magnetic field.
Background technology
Electricity one acoustical convertor, especially electric power transducer are widely used in the communication equipment, telephone for example, mobile phone or cellular phone etc. and require to have in the hearing aids of small scale structures.No matter transducer is as microphone, or loud speaker (microphone) all is that voice signal is converted to the signal of telecommunication, and vice versa.For microphone that is used for mini-plant and loud speaker, vital is exactly that above-mentioned transducer can antivibration, to avoid unnecessary noise or feedback problem.
If microphone and loud speaker are in close proximity to each other, especially in hearing aids, because the vibration that loud speaker produces will produce feedback loop.The vibration of loud speaker is delivered in the microphone by shell, if reach a certain degree, above-mentioned vibration will be converted to the signal of telecommunication of amplification, and be converted to sound and vibration once more by loud speaker, so just produces a unnecessary feedback loop.Such loop can reduce the quality of sound.If under big gain situation, for example in hearing aids, above-mentioned feedback loop even can cause the interference microphony of sound, thus become a limiting factor of maximum possible gain in the hearing aids.
In the prior art, use rubber boot or built-in box (box-in-a-box) structure to carry out vibration isolation usually.In above-mentioned built-in box structure, receiver is installed in the very soft packing ring, to obtain required vibration isolating effect.Utilize in the hearing aids of conductive coil, also can utilize extra shell conduct every magnetic mechanism.
The another kind of mode of vibration isolation is utilized two identical receivers (dual collector) of (back to back) coupling back-to-back exactly, thereby reduces the vibration of whole system.
A shortcoming of above-mentioned rubber boot is exactly that it does not have enough vibration isolation functions, and is difficult to design and restive design parameter.And above-mentioned built-in box structure is easy to become big and heavy.
Above-mentioned dual collector structure can not thoroughly be eliminated vibration, because when using balanced armature receiver in the hearing aids, such receiver always produces rotational component.When utilization has the dual collector of two conventional radial electric power transducers or loud speaker, just vibration isolation significantly.And for mobile phone, such transducer also can be used as vibration machine, in order to producing the alarm signal of mourning in silence, thus the weight and the space of having saved single vibration machine.
JP11 308691A (english abstract) discloses a kind of speaker system, and it comprises two barrier films and a general magnetic circuit.Because above-mentioned two barrier films move in opposite direction, the vibration force of magnetic circuit just is minimized, thereby single relatively barrier film loud speaker has just improved electroacoustic efficiency.But the speaker system among the JP11308691A has a shortcoming, because its magnetic circuit and barrier film all are annular, whole winding is positioned at annular magnetic gap.So for such loud speaker, in order to reduce interference, manufacturing tolerance is just extremely important during design, for example the centering of voice coil loudspeaker voice coil.In addition, magnetic circuit is very huge, thereby is unsuitable for being used for the limitation in height of space limited application, especially loud speaker.And a large amount of single elements of the speaker system of JP11308691A needs, produce by batch so be unsuitable for low cost.
JP07 131893A (english abstract) discloses the two barrier film loud speakers with a general magnetic circuit.Loud speaker purpose among the JP07 131893A is to launch two-way sound, and phase deviation can not take place.This is accomplished by two vibrational systems are synthesized a main body (body).Above-mentioned barrier film and magnetic circuit are annular, and the full annular voice coil loudspeaker voice coil is positioned at above-mentioned magnetic gap.This design has a large amount of shortcomings, owing to relate to the technology of upper two-way loudspeaker, parameters such as size and weight seem unimportant, and therefore design is just very miscellaneous huge.So the loud speaker of JP07 131893A is unsuitable for small design.In addition, above-mentionedly relate to the problem of dtmf distortion DTMF that non-complete symmetry causes in the magnetic circuit and also be not resolved.And because a large amount of single elements and complicated geometric configuration, so this design and be not suitable for low cost and produce by batch.
So just need a kind of electricity one acoustical convertor with two barrier films, insensitive to vibrating as microphone the time, during as loud speaker, the free induction vibration.Above-mentioned transducer must be adapted to compact applications, for example is used for communication equipment and hearing aids.
Summary of the invention
One object of the present invention just provide a kind of compact conformation and be common to telecommunication apparatus and hearing aid device in electricity one acoustical convertor.
Another purpose of the present invention just provides a kind of electricity-acoustical convertor with following characteristics:
1. the twin loudspeaker that has general magnetic circuit and two barrier films,
2. two kinds of possible operator schemes: vibration cancellation pattern or vibration producing method,
3. owing to the low efficient magnetic circuit that leaks has high efficiency.
According to the present invention, above-mentioned purpose is accomplished by a kind of electricity-acoustical convertor that first aspect provided, and it comprises:
One has the magnetic circuit in first and second gaps, and above-mentioned each first and second gap all have a upper and lower, and above-mentioned magnetic circuit further comprises magnetic force mechanism, thereby generates a magnetic field in above-mentioned first and second gaps,
One is positioned at first and second barrier films of above-mentioned magnetic circuit opposite side,
One is fixed to first lead loop of above-mentioned first barrier film, first coil with first and second clearance portion of lead is positioned at a top in first and second gaps separately, above-mentioned first coil further has and the interconnected lead bridge part of first, second clearance portion of lead, above-mentioned first coil is at least at the bridge part of above-mentioned lead, be fixed on above-mentioned first barrier film, and
One is fixed to second lead loop of above-mentioned second barrier film, second coil with lead first and second clearance portion is positioned at a bottom in first and second gaps separately, above-mentioned second coil further has and the interconnected lead bridge part of first, second clearance portion of lead, above-mentioned second coil is fixed on above-mentioned second barrier film at least at the bridge part of above-mentioned lead.
Above-mentioned first coil is along above-mentioned first barrier film of being fixed to of at least one clearance portion.Similarly, second coil can be fixed on above-mentioned second barrier film along one clearance portion at least.
Each first and second gap can be limited by a pair of apparent surface, and these surfaces are the plane substantially, and parallel to each other.
Above-mentioned magnetic force mechanism comprises first and second permanent magnets, and above-mentioned first magnet produces one first magnetic field in first gap, and above-mentioned second magnet produces one second magnetic field in second gap.Above-mentioned magnetic circuit comprises the magnet of a soft magnetic material, and above-mentioned magnet has first and second openings.
Preferably, above-mentioned first magnet is positioned within first opening of above-mentioned magnet, and second magnet is positioned within second opening of magnet.
Above-mentioned barrier film comprises conductive part, and the conductor wire end of above-mentioned conductive part and above-mentioned coil links to each other, the entered portion of conductive part for can transducer being cut off the power supply from the external world.
For hearing aids, between the top and the bottom in first and second gaps separately, be provided with a space overlap.Introduce this space overlap, can reduce the size of above-mentioned transducer.In other were used, desirable was that the top and the bottom in first and second gaps are separately separated by the space.
Second aspect according to first aspect present invention, the present invention relates to a kind of lead loop that is used for transducer, and wherein this coil comprises:
Be limited with the bridge part on a bridge joint plane, and have a flat surface, in order to being fixed on the barrier film,
Clearance portion outside the above-mentioned bridge joint plane, each clearance portion all comprise the conducting line segment outside a plurality of bridge joints plane.
Preferably, the conducting line segment in the above-mentioned clearance portion is straight line substantially.
The third aspect the present invention relates to a kind of method of making lead loop, and this method comprises:
Limit the coil of coil axis by lead processing one; And
The crooked above-mentioned coil of bending axis around two basic vertical above-mentioned coil axises.
Fourth aspect according to first aspect, the present invention relates to a kind of magnetic circuit that is used for transducer, and this magnetic circuit comprises:
Be formed with a permeability magnetic material, thereby limit a pair of apparent surface, be formed with a gap between this surface, above-mentioned gap is in order to receiving the first and second lead loop parts,
Magnetic force mechanism, thus a magnetic field generated in the top and the bottom in above-mentioned gap, above-mentioned top is in order to receive first coiler part, and the bottom is in order to receive second coiler part.
Preferably, each all has plane parallel to each other to the apparent surface.Above-mentioned magnetic force mechanism comprises permanent magnet, and each this permanent magnet all has the plane on a formation plane, one gap.This magnetic force mechanism forms the magnet that is made of soft magnetic material, thereby is limited with two openings in magnet, and each opening has a pair of apparent surface in first and second gaps separately that is formed with.Preferably, magnetic force mechanism is arranged in the opening of above-mentioned magnetic circuit.
The 5th aspect according to first aspect, the present invention relates to a kind of method of operation of transducer, and wherein first and second barrier films are in equidirectional deflection, and provide the identical signal of telecommunication to first and second coils at the same time.
The 6th aspect according to first aspect, the present invention relates to the method for operation of another kind of transducer, wherein first and second barrier films deflection in the opposite direction, and provide the identical signal of telecommunication to first and second coils at the same time.
Description of drawings
Below, the present invention will be further by coming with reference to the accompanying drawings to be described in detail, wherein:
Fig. 1 shows embodiment major part that the present invention one the is suitable for telecommunication apparatus exploded view shown in last;
Fig. 2 shows the identical parts (in Fig. 1) that part is decomposed;
Fig. 3 shows more detailed same parts;
Fig. 4 shows the coil of using in the transducer of the present invention;
Fig. 5 shows the sectional view that the present invention is suitable for another embodiment of hearing aids;
The sound equipment passage that sound connects between the volume that provides between barrier film and the transducer outside is provided Fig. 6;
Fig. 7 shows the transducer of installing fully that is suspended on two elastic components;
Fig. 8 shows the transducer that is used for hearing aids;
Fig. 9 shows the same part (Fig. 8) that part is installed.
Embodiment
Fig. 1-3 shows an electric power transducer, and has main parts size: magnetic circuit 10, the first coils 2, the second coil 12, the first barrier films, 1, the second barrier film 13 and four joint 6-9.
As shown in Figure 1, electric power transducer according to the present invention comprises two barrier films 1,13 and two coils 2,12, and has a general magnetic circuit.Above-mentioned two barrier films are driven by two kinds of operator schemes, both can be identical polars, also can be opposite polarities.If above-mentioned two barrier films drive at equidirectional in response to input electrical signal, above-mentioned transducer is just driven by so-called vibration mode.Vibration mode can cause maximum vibration, but does not have voice output.If above-mentioned two barrier films are driven in the opposite direction, just have maximum acoustic output, above-mentioned transducer free vibration.Joint 6,8 and coil 2 electrically contact, and joint 7,9 and coil 12 electrically contact.Contact between above-mentioned joint and the coil can be provided by the conduction portion of barrier film 25,26.The present invention is particularly suitable for for the very limited application of speaker volume.Utilize the structure among the present invention, just can obtain efficient volume and maximum output to the desirable rate between the volume.
Below, two embodiment are described, one is suitable for hearing aids, and one is suitable for communication equipment.Be appreciated that the present invention is not limited to these fields.
Among Fig. 1, two-piece type plastic casing 3,11 is in suitable position in order to keep magnetic force systems.This magnetic force systems comprises the magnetic circuit 10 with two long foot 27,28 and two short legs 30,30 ', and above-mentioned leg forms the ring that is roughly rectangle in the end.Middle leg 29 and two short legs 30,30 ' interconnect, thereby the inside of above-mentioned straight-flanked ring is divided into two rectangular apertures.Above-mentioned two long foot 27,28 of magnetic circuit, short leg 30,30 ' and middle leg 29 are soft magnetic material, are preferably the material with high magnetic saturation value.Above-mentionedly be generally the plane, and be formed with a gap towards two long foot 27,28 of opening 24 and the surface of middle leg 29.
Can remove the mid portion of above-mentioned long foot,, then magnet 4,5 is positioned in the above-mentioned opening 24 so that be the sticking flange 21,22 that plastic casing 3,11 parts are provided for magnet 4,5.Operating the installation process that obtains to simplify based on simple accumulation is a target.Each magnet all has a magnetic pole and the opposite magnetic pole towards middle leg 29 towards the long foot direction.According to the location of magnet, between free pole surface and middle leg, or just can be limited with above-mentioned magnetic gap between free pole surface and the long foot like this.
Each magnet 4,5 all can produce a magnetic field in the gap of correspondence, by leg 29 in above-mentioned, short leg 30,30 ' and long foot 27,28 just are limited with a magnetic return path.This magnetic return path is fully around above-mentioned magnetic gap, and each magnet has the pole surface in a qualification gap.This just makes the compact conformation of above-mentioned magnetic force systems and smooth, and magnetic field all concentrates in the above-mentioned gap, and magnetic field is rare spuious, thereby has hypersensitivity, and has reduced the demand of magnetic screen.
A sound travel can be provided with in the outside, thereby the volume in the shift joint can be utilized.This sound travel can be penetrated into plastic casing and pole shoe, produces a tone channel inside volume (back volume) of extraneous and loud speaker is connected.Can be by the interpolation cloth, mesh, or the acoustic damping material of process opening 15,18 obtains sound dampening.Above-mentioned acoustic damping material can be an induction type, resistance-type or the combination of the two.Above-mentioned tone channel can also be used for the bass reflex load as in using at other, to obtain the LF-response of expansion.The tone channel in the above-mentioned inner volume and the transducer outside can remove magnetic circuit 61,62 parts, as described in Figure 6 so that constitute above-mentioned tone channel.As shown in the figure, above-mentioned tone channel can be used as elongated and narrow in the magnetic circuit edge.Because size is less, such slype can be used as the filter of sound low pass, and cut-off frequency is about 1Hz.In Fig. 6, two passages are around above-mentioned magnetic circuit half-turn, and on the principle, above-mentioned passage can have several circles, and occupying more or less, which floor forms the stepped construction of above-mentioned magnetic circuit.
The volume of above-mentioned inner volume can increase by leg 29 in removing, because flux density is almost nil, so almost there is not the opposite effect.
In the required number of turn of coil coiling, reach required form after, coil removes from above-mentioned mandrel.Because the temperature that raises is still awfully hot when above-mentioned coil, when above-mentioned japanning is still very soft, utilizes a bending apparatus (not shown), coil is along two in the flatwise coil plane parallel cambered axle 33 bendings.The given shape of coil as shown in Figure 1, 2, two long section 34 short relatively section, 35 crooked about 90 degree of coil, two long section 34 parallel to each other.After coil bending, begin to cool down, thereby make japanning no longer soft, coil is fixed.Above-mentioned bending and fixing coil are set on the barrier film 1,13.For telecommunication apparatus, above-mentioned barrier film can be by flexible thin manufacturing, for example flexible circuit board material.Side within it, promptly in the side shown in Fig. 2 lower part, barrier film 1,13 has copper conductive part 25,26.Utilize binding agent, two of coil short sections 35 and conductor wire end 31 are fixed to the inboard of above-mentioned barrier film, and conductor wire end connects by welding and 25,26 conductions of conductive part separately.Conductive part can also be in order to the sclerosis and the fixing mid portion of barrier film 1,13, and as mentioned above, makes coil contact with above-mentioned joint conduction.Owing to avoided fine rule fully, so this has just improved the reliability of loud speaker from moving coil to permanent joint 6-9.But conductor wire end also can be connected electrically on the joint on the shell by welding.
In another embodiment, coil can be formed by flexible thin, for example flexible printed circuit board, i.e. core of flexible (flexprint).Such flexible thin comprises a default conductive path, thereby forms a helical form conductive path.As described later, in a preferred embodiment, above-mentioned barrier film also comprises conductive part.So above-mentioned coil and barrier film can be made by the single core of flexible with conductive path.The shape of this core print can be so that two long section relative remaining whole barrier film/loop construction of coil has the angle of 90 degree.Barrier film 1,13 is a rectangle, and protuberance 24 ' stretches out from the elongate curved side of above-mentioned film, and conductive part 25,26 extends to above-mentioned protuberance 24 ', thereby makes the conductive part 25,26 of protuberance be connected with separately winding wire end 31 conduction.
The barrier film 1,13 that is fixed with coil 2,12 is then and in two long section each top, gap that is installed on the above-mentioned magnetic force systems of coil 2.Similarly, in the bottom that two of coil 12 long section is positioned in each gap.Therefore above-mentioned long section 34 can also be as the clearance portion of coil.The short section 35 of coil is arranged on the above-mentioned leg 29, and the clearance portion of the above-mentioned coil of bridge joint.
Above-mentioned section 35 preferably in order to by bonding agent with above-mentioned coil stationary to barrier film.This coil can further be fixed on the barrier film along the part of at least one clearance portion 34.Can be by whole length along clearance portion 34, to barrier film, for example binding agent obtains the good mechanical connection between coil and the barrier film with coil stationary, and this will improve the hardness of barrier film and make barrier film have the motion of similar piston.
Above-mentioned barrier film is fixed to above-mentioned magnetic force systems along its edge as shown in Figure 3.If desired, the minor face of barrier film can also be fixed on magnetic force systems or the shell, and above-mentioned groove also can be by flexible material sealing, thereby makes above-mentioned minor face to move.But above-mentioned core of flexible can prevent air and enter opposite side from a side of barrier film that if desired, the edge of barrier film can be fixed to magnetic force systems by binding agent.
In a preferred embodiment, barrier film is a rectangle, but also can utilize other shape.
By laser beam perforation, the flexibility around the barrier film can increase.And the common form of above-mentioned two barrier films can be by the introducing hole institute balance on one or two barrier film, thereby obtains two flexibilities between the barrier film.
Magnetic circuit 1 as shown in Figure 1 is stacked to be which floor.Magnetic circuit can also be made of a solid element, or can be used as the outer shroud that is inserted in the middle leg.
Fig. 1-3 also shows above-mentioned two-piece type plastic casing 3,11 and has four groove or passages that extend at above-mentioned shell long axis direction of total in its side.As shown in Figure 2, these grooves are in order to supported joint 6-9.The height of above-mentioned passage is corresponding to the width of each joint 6-9.Barrier film 1 is connected to joint 6,8, and barrier film 13 is connected to joint 7,9.Installing and the contacted transducer of above-mentioned joint place, can approach the tin layer by on membrane portions, being provided with between above-mentioned barrier film and the joint, and be connected.As Figure 1-3, in the barrier film of each area of isolation, be provided with an aperture.By heated coupling, these apertures can so that laser beam heats around the barrier film in these holes, thereby melt tin on these zones.Use this process on all four zones that link to each other with above-mentioned joint, above-mentioned barrier film just is soldered on the joint.
For the output of synthetic above-mentioned two barrier films, need the shell of circulating loudspeaker.Such shell is provided with in the following manner, i.e. the output of outlet of inner volume and barrier film front portion is isolated.As shown in Figure 7, the front and back output as shown in the figure, can constitute the annex that links to each other with surrounding environment by flexible rubber material 74,75 in different sound outlets, and the resonance that this mode obtained is approximately 100-150Hz.When transducer is worked under vibration mode, just can obtain the maximum output that produces, this usually occurs in the zone of 100-150Hz.Represent 100 gram masses of mobile phone quality can obtain the required acceleration of about 1G.Vibration on the rubber accessory can be a spring, plastics, and silicones or other flexible materials produce, and in required frequency range, promptly obtain above-mentioned resonance in the 100-150Hz.
Above-mentioned transducer can be equal to loudspeaker transducer and microphone.When being used as loudspeaker transducer, the signal of telecommunication of audio frequency is provided with above-mentioned joint, and the resultant current of above-mentioned winding space portion and the magnetic field interaction in the gap make above-mentioned coil and barrier film move, and produces audio sound.And when being used as microphone, act on audio sound on the barrier film it to be produced move, when the clearance portion of coil is mobile in magnetic field, the output that will produce the signal of telecommunication and transducer joint.
Can also be used as annunciator according to transducer of the present invention,, can have a resonance peak value, be approximately 1.5KHz, but also replaceablely be between 800Hz-3KHz by tuning above-mentioned transducer.
Two membrane transducer can be operated-above-mentioned two barrier film coil system homophases (barrier film in the opposite direction moves) or the connection of out-phase (barrier film moves at equidirectional) conduction in two ways.Above-mentioned transducer can be used to have the high efficiency loudspeakers of ball-type directional mode when couple in phase.When transducer out-phase was coupled, it was the vibration source of mourning in silence substantially.Accordingly, when being used as microphone, above-mentioned transducer also can have ball-type or lemniscate type (8 font) directional mode.
For the equipment of mobile communication, owing to it can be used as the loud speaker of operate in standard mode and can be used as the vibration source that silent signal can be provided, so above-mentioned pair of membrane transducer is very attractive.Just save the space as the double source transducer of above-mentioned two functions like this, reduced the total quantity of weight and single element.
For specific application, it should be noted that the directional mode of above-mentioned pair of membrane transducer can utilize the appropriate signal processing to control in more detail.But frequency range need depend on the size of barrier film.
About portable unit, user can thinkable pattern utilizes mechanical mechanism exactly and is not only pictures and sounds, will vibrate and voice output mixes and simulates.For the present invention, such reason is exactly by feed signal polarity on the coil of simple switching, can switch between vibration mode and acoustic pattern at an easy rate.
About hearing aids, main problem is fed back exactly.Feedback just means that the vibration that produced by receiver (loud speaker) is by the above-mentioned hearing aids of mechanical connection/be delivered to.After this, will be converted to sound once more, thereby be entered microphone, be caused feedback.Even the loud speaker sometimes, in hearing aids also is a problem when directly linking to each other with microphone.
Because the motion of above-mentioned barrier film does not have rotational component, so the present invention just can eliminate vibration fully.This true determines that promptly barrier film is driven by hard coil by following, above-mentioned drive point space, and also symmetrical.Only difference is exactly that above-mentioned barrier film is flexible poor.
Optimizing a kind of of above-mentioned situation may mode utilize above-mentioned inner volume exactly, and above-mentioned inner volume can be determined the flexibility of above-mentioned barrier film.Because the inside volume of two barrier films is identical, so very helpful.Barrier film should with extraneous acoustic isolation mutually.For hearing aids, this just needs good LF-response.Only a barrier film is provided with the isostasy hole.
As shown in Figure 6, another kind of mode is used sheet shaped piece exactly in above-mentioned magnetic circuit, in order to structure sound low pass filter.Usually, in hearing aids,, can cause the previous feedback of being discussed, so inner volume does not have opening because the sound that such opening is sent is passed in the hearing aids.The cut-off frequency very low (sub 1Hz) of above-mentioned sound low pass filter, the high frequency scale is not sufficient to cause feedback.
Can be provided with one with the output of barrier film and the synthetic general operatic tunes of output of path, so that the path joint, the output of barrier film has identical phase place with the output of path for a certain frequency range, and is similar to a bass reflex loud speaker.
Magnetic circuit in the transducer of the present invention can design the feasible loop A C flux that can cancel the opposite polarity driving.This just will reduce the shielding of communication coil magnetic feedback greatly.This result makes and can utilize plastic casing (reducing cost) in the low gain hearing aids, in the high-gain hearing aids, needs lower shielding.The pole shoe storehouse self is exactly a complete self-enclosed magnetic circuit with good shielding properties.
About mechanical stability, the pole shoe that is preferably sandwich construction is very hard.Direct and the contacted shell of sandwich construction can move and replace.Because be compared to present hearing aids receiver, hard shell can also reduce acoustic radiating like this, and this rigid structure will make performance be improved greatly.
For hearing aids, very important is exactly to have a thin transducer.A kind of mode of Fig. 1-3 structure thin makes above-mentioned coil 2,12 compete each other exactly, cuts open the described identical gap of figure thereby make among their shared Fig. 5.Because the gap is very big, but thickness is very little, so such structure can make loss in efficiency.For hearing aids, need have the multi-form barrier film of dwell angle (closed corner) 81.Transducer with such barrier film is as described in Fig. 8 and 9.
Can at least one barrier film electronic mechanism be installed, such electronic mechanism has different functions.This electronic mechanism can be installed on the single-chip by bonding agent.If the impedance of transducer coil is too low, to such an extent as to can not carry out work, for example can not be used in the mobile phone with the conditional electronic amplifier apparatus, above-mentioned electronic mechanism can comprise an impedance transformer.Such chip can be installed in the coil sides of barrier film.Owing to can improve the filling of lead, so just might improve above-mentioned converter efficiency by reducing the quantity of coil simplex winding with impedance transformer to above-mentioned magnetic gap.This is that the embodiment with core of flexible of integrated coil is even more important at least one barrier film.For this scheme, by increase winding quantity, owing to can remove conductor material so that increase more windings, so above-mentioned filling can obviously reduce.Use above-mentioned impedance transformer can compensate Low ESR,, will improve the efficient of above-mentioned transducer by reducing winding quantity.
Electronic mechanism can comprise the mechanism of detecting diaphragm movement and being combined with reponse system.Above-mentioned electronic mechanism can also comprise switching mechanism, if for example above-mentioned transducer is used as loud speaker, can be the switching mechanism between sound and the vibration mode.Above-mentioned electronic mechanism can also comprise one in order to regulate the attenuator of volume.
In a preferred embodiment, above-mentioned magnetic circuit is a rectangle, and is provided with the clearance portion that two gaps receive above-mentioned coil.Wherein above-mentioned gap is limited between the apparent surface.In another structure, magnetic circuit has four clearance portion, and similar foursquare four limits, ground are set.Corresponding, above-mentioned coil has four clearance portion, and same similar foursquare four limits, ground are set.The bridge part of above-mentioned coil is positioned at the angle of above-mentioned positive direction, is fixed on the above-mentioned barrier film in above-mentioned four positions.The outline of above-mentioned magnetic circuit can have required shape, can be annular.And above-mentioned gap and clearance portion coil also can bend to circular arc.
Claims (26)
1. electricity one acoustical convertor comprises:
One has the magnetic circuit in first and second gaps, and above-mentioned each first and second gap all have a upper and lower, and above-mentioned magnetic circuit further comprises magnetic force mechanism, thereby generates a magnetic field in above-mentioned first and second gaps,
One is positioned at first and second barrier films of above-mentioned magnetic circuit opposite side,
One is fixed to first lead loop of above-mentioned first barrier film, first coil with lead first and second clearance portion is positioned at a top in first and second gaps separately, above-mentioned first coil further has and the interconnected lead bridge part of first, second clearance portion of lead, above-mentioned first coil is at least at the bridge part of above-mentioned lead, be fixed on above-mentioned first barrier film, and
One is fixed to second lead loop of above-mentioned second barrier film, second coil with lead first and second clearance portion is positioned at a bottom in first and second gaps separately, above-mentioned second coil further has and the interconnected lead bridge part of first, second clearance portion of lead, above-mentioned second coil is fixed on above-mentioned second barrier film at least at the bridge part of above-mentioned lead.
2. transducer as claimed in claim 1 is characterized in that above-mentioned first coil is along on above-mentioned first barrier film of being fixed to of at least one clearance portion.
3. transducer as claimed in claim 1 or 2 is characterized in that second coil can be fixed on above-mentioned second barrier film along one clearance portion at least.
4. the described transducer of arbitrary as described above claim is characterized in that each first and second gap can be limited by a pair of apparent surface, and these surfaces are the plane substantially, and parallel to each other.
5. the described transducer of arbitrary as described above claim is characterized in that above-mentioned magnetic force mechanism comprises first and second permanent magnets, and above-mentioned first magnet produces one first magnetic field in first gap, and above-mentioned second magnet produces one second magnetic field in second gap.
6. transducer as claimed in claim 5 is characterized in that above-mentioned magnetic circuit comprises the magnet of a soft magnetic material, and above-mentioned magnet has first and second openings.
7. transducer as claimed in claim 6 it is characterized in that above-mentioned first magnet is positioned within first opening of above-mentioned magnet, and second magnet is positioned within second opening of magnet.
8. transducer as claimed in claim 7, it is characterized in that above-mentioned first gap is made of the apparent surface of first magnet and first long foot of soft magnetic material magnet, and second gap is made of the apparent surface of second magnet and second long foot of soft magnetic material magnet.
9. transducer as claimed in claim 7 it is characterized in that above-mentioned first gap is made of the apparent surface of first magnet and the middle leg of soft magnetic material magnet, and second gap is made of the apparent surface of second magnet and the middle leg of soft magnetic material magnet.
10. the described transducer of arbitrary as described above claim is characterized in that above-mentioned barrier film comprises conductive part, and the conductor wire end of above-mentioned conductive part and above-mentioned coil links to each other, the entered portion of conductive part for can transducer being cut off the power supply from the external world.
11. the described transducer of arbitrary as described above claim is characterized in that being provided with a space overlap between the top and the bottom in first and second gaps separately.
12., it is characterized in that the top and the bottom in first and second gaps are separated by the space separately as the arbitrary described transducer of claim 1-10.
13. the described transducer of arbitrary as described above claim is characterized in that for example core of flexible of a flexible PCB, forms above-mentioned first barrier film, wherein above-mentioned first coil is formed by the conductive path on the flexible PCB.
14. the described transducer of arbitrary as described above claim is characterized in that for example core of flexible of a flexible PCB, forms above-mentioned second barrier film, wherein above-mentioned second coil is formed by the conductive path on the flexible PCB.
15. the described transducer of arbitrary as described above claim further comprises the electronic mechanism that is installed at least one barrier film.
16. transducer as claimed in claim 15 is characterized in that above-mentioned electronic mechanism comprises an impedance transformer.
17. one kind is described and be used for the lead loop of transducer according to aforementioned arbitrary claim, it is characterized in that this coil comprises:
Be limited with the bridge part on a bridge joint plane, and have a flat surface, in order to being fixed on the barrier film, and
Clearance portion outside the above-mentioned bridge joint plane, each clearance portion all comprise the conducting line segment outside a plurality of bridge joints plane.
18. coil as claimed in claim 17 is characterized in that the conducting line segment in the above-mentioned clearance portion is straight line substantially.
19. a method of making lead loop, this method comprises:
Limit the coil of coil axis by lead processing one,
Around the crooked above-mentioned coil of bending axis of two basic vertical above-mentioned coil axises,
20. one kind as arbitrary described and be used for the magnetic circuit of transducer among the claim 1-16, this magnetic circuit comprises:
Be formed with a permeability magnetic material, thereby limit a pair of apparent surface, be formed with a gap between this surface, above-mentioned gap is in order to receiving the first and second lead loop parts,
Magnetic force mechanism, thus a magnetic field generated in the top and the bottom in above-mentioned gap, above-mentioned top is in order to receive first coiler part, and the bottom is in order to receive second coiler part.
21. magnetic circuit as claimed in claim 20 is characterized in that each all has plane parallel to each other to the apparent surface.
22. magnetic circuit as claimed in claim 21 is characterized in that above-mentioned magnetic force mechanism comprises permanent magnet, each this permanent magnet all has the plane on a formation plane, one gap.
23. as the arbitrary described magnetic circuit of claim 20-22, it is characterized in that this magnetic circuit comprises the magnet that is made of soft magnetic material, thereby in magnet, be limited with two openings that each opening has a pair of apparent surface in first and second gaps separately that is formed with.
24. magnetic circuit as claimed in claim 23 is characterized in that magnetic force mechanism is arranged in the opening of above-mentioned magnetic circuit.
25. one kind as the arbitrary described transducer method of operation of claim 1-16, wherein first and second barrier films are in equidirectional deflection, and provide the identical signal of telecommunication to first and second coils at the same time.
26. one kind as the arbitrary described transducer method of operation of claim 1-16, wherein first and second barrier films deflection in the opposite direction, and provide the identical signal of telecommunication to first and second coils at the same time.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US31879801P | 2001-09-11 | 2001-09-11 | |
| DKPA200101325 | 2001-09-11 | ||
| US60/318,798 | 2001-09-11 | ||
| DKPA200101325 | 2001-09-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1554210A true CN1554210A (en) | 2004-12-08 |
Family
ID=26069062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA02817691XA Pending CN1554210A (en) | 2001-09-11 | 2002-09-11 | An electro-acoustic transducer with two diaphragms |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1437030A1 (en) |
| JP (1) | JP2005503091A (en) |
| CN (1) | CN1554210A (en) |
| WO (1) | WO2003024151A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891423A (en) * | 2014-03-06 | 2015-09-09 | 英飞凌科技股份有限公司 | Double diaphragm mems microphone without a backplate element |
| US9232305B2 (en) | 2007-09-26 | 2016-01-05 | Harman Becker Gepkocsirendszer Gyarto Korlatolt Felelossegu Tarsasag | Acoustic transducer |
| CN105432095A (en) * | 2013-03-06 | 2016-03-23 | 哈曼贝克自动系统制造有限责任公司 | Acoustic transducer assembly |
| CN105916071A (en) * | 2016-07-06 | 2016-08-31 | 沈伟 | Flexible telephone receiver and loudspeaker |
| CN108632723A (en) * | 2017-03-15 | 2018-10-09 | 奥音科技（北京）有限公司 | Dynamic loudspeaker with magnetic circuit system |
| CN109089197A (en) * | 2018-07-27 | 2018-12-25 | Oppo广东移动通信有限公司 | Loudspeaker monomer, loudspeaker assembly and electronic equipment |
| CN109151680A (en) * | 2018-07-27 | 2019-01-04 | Oppo广东移动通信有限公司 | Electronic equipment |
| CN109756828A (en) * | 2019-01-15 | 2019-05-14 | 歌尔股份有限公司 | Sounding device and electronic equipment |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152678A (en) * | 2013-03-08 | 2013-06-12 | 山东共达电声股份有限公司 | Driver for electrodynamic loudspeaker |
| JP7352549B2 (en) * | 2017-12-22 | 2023-09-28 | ビー アンド エル センサー テクノロジーズ エルエルシー | Device and method for sensing underwater sound pressure |
| GB2591223A (en) | 2020-01-22 | 2021-07-28 | Gp Acoustics International Ltd | Loudspeakers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57154998A (en) * | 1981-03-19 | 1982-09-24 | Seiko Instr & Electronics Ltd | Electromagnetic speaker |
| JPH07131893A (en) * | 1993-10-29 | 1995-05-19 | Kenwood Corp | Speaker unit |
| JPH11308691A (en) * | 1998-04-24 | 1999-11-05 | Sony Corp | Loud speaker system |
| JP4032369B2 (en) * | 1998-11-27 | 2008-01-16 | アツデン株式会社 | Vibration / speaker unit |
-
2002
- 2002-09-11 CN CNA02817691XA patent/CN1554210A/en active Pending
- 2002-09-11 WO PCT/DK2002/000592 patent/WO2003024151A1/en not_active Application Discontinuation
- 2002-09-11 EP EP02776891A patent/EP1437030A1/en not_active Withdrawn
- 2002-09-11 JP JP2003528061A patent/JP2005503091A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9232305B2 (en) | 2007-09-26 | 2016-01-05 | Harman Becker Gepkocsirendszer Gyarto Korlatolt Felelossegu Tarsasag | Acoustic transducer |
| CN101884226B (en) * | 2007-09-26 | 2016-10-19 | 哈曼贝克自动系统制造有限责任公司 | Acoustic transducer and operational approach thereof |
| US9807518B2 (en) | 2007-09-26 | 2017-10-31 | Harman Becker Gepkocsirendszer Gyarto Korlatolt Felelossegu Tarsasag | Acoustic transducer |
| CN105432095B (en) * | 2013-03-06 | 2019-05-10 | 哈曼贝克自动系统制造有限责任公司 | Acoustic transducer assembly |
| CN105432095A (en) * | 2013-03-06 | 2016-03-23 | 哈曼贝克自动系统制造有限责任公司 | Acoustic transducer assembly |
| CN104891423A (en) * | 2014-03-06 | 2015-09-09 | 英飞凌科技股份有限公司 | Double diaphragm mems microphone without a backplate element |
| US9510107B2 (en) | 2014-03-06 | 2016-11-29 | Infineon Technologies Ag | Double diaphragm MEMS microphone without a backplate element |
| CN104891423B (en) * | 2014-03-06 | 2017-09-12 | 英飞凌科技股份有限公司 | Double barrier film MEMS microphones without backboard |
| CN105916071A (en) * | 2016-07-06 | 2016-08-31 | 沈伟 | Flexible telephone receiver and loudspeaker |
| CN108632723A (en) * | 2017-03-15 | 2018-10-09 | 奥音科技（北京）有限公司 | Dynamic loudspeaker with magnetic circuit system |
| CN108632723B (en) * | 2017-03-15 | 2020-07-10 | 奥音科技（北京）有限公司 | Dynamic loudspeaker driver, manufacturing method thereof, loudspeaker and mobile device |
| CN109089197A (en) * | 2018-07-27 | 2018-12-25 | Oppo广东移动通信有限公司 | Loudspeaker monomer, loudspeaker assembly and electronic equipment |
| CN109151680A (en) * | 2018-07-27 | 2019-01-04 | Oppo广东移动通信有限公司 | Electronic equipment |
| CN109151680B (en) * | 2018-07-27 | 2020-09-04 | Oppo广东移动通信有限公司 | Electronic device |
| CN109756828A (en) * | 2019-01-15 | 2019-05-14 | 歌尔股份有限公司 | Sounding device and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003024151A1 (en) | 2003-03-20 |
| JP2005503091A (en) | 2005-01-27 |
| EP1437030A1 (en) | 2004-07-14 |
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