CN102187687B - Diaphragm for sound converter and sound converter including the same - Google Patents
Diaphragm for sound converter and sound converter including the same Download PDFInfo
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- CN102187687B CN102187687B CN200980141189.3A CN200980141189A CN102187687B CN 102187687 B CN102187687 B CN 102187687B CN 200980141189 A CN200980141189 A CN 200980141189A CN 102187687 B CN102187687 B CN 102187687B
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- diaphragm
- groove
- middle body
- acoustic transducers
- frame
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Classifications
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
- H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/029—Diaphragms comprising fibres
-
- 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
Abstract
The present invention discloses a diaphragm for a sound converter including a first diaphragm having a central portion which is a plane surface and a side dome formed around the central portion, and a second diaphragm formed at the central portion of the first diaphragm. The sound converter maximizes the volume of a magnet mounted therein, and thus improves a sound pressure of low frequency bands. In addition, the sound converter allows a lead wire of a coil portion to be pulled out without interfering with other elements, and thus stably transmits electrical signals without damaging the lead wire or the other elements.
Description
Technical field
The present invention relates to diaphragm and the acoustic transducer that comprises diaphragm for acoustic transducer, relate more specifically to have the diaphragm for acoustic transducer and the acoustic transducer of the effective area of increase and the rigidity of reduction.
Background technology
Conventionally, loud speaker converts electrical energy into mechanical energy according to the bright Left Hand Rule of Franc by the voice coil loudspeaker voice coil that is arranged in space, this Franc of bright Left Hand Rule explanation: in the time that the conductor of current flowing is disposed in magnetic field, apply power thereon.That is, in the time applying to voice coil loudspeaker voice coil the current signal that comprises various frequencies, voice coil loudspeaker voice coil produces mechanical energy according to the size of current strength and frequency, and the diaphragm accompanying for voice coil loudspeaker voice coil causes vibrations, and last generation is enough to by the big or small acoustic pressure of ear recognition.
The magnetic circuit that has designed loud speaker in the yoke by using the ferrous metal element of magnet (permanent magnet) and top board (or upper plate) to form, makes magnetic flux be linked to the voice coil loudspeaker voice coil that is arranged in space with right angle.Voice coil loudspeaker voice coil is attached to diaphragm vertically to produce excitation force according to input signal, and the diaphragm that vibrations are attached to frame and are retrained by this frame, therefore produces acoustic pressure.Provide various forms of ripples to diaphragm, to prevent good response characteristic and the flexing phenomenon during vertical vibration.The shape of diaphragm is as the design variable for frequency characteristic with major effect.
Fig. 1 is the sectional view of traditional Microspeaker.
As shown in fig. 1, Microspeaker comprises: frame 1; The yoke 2 that inserts and install in frame 1; Interior ring magnet 3 and outer shroud magnet 4, for sending magnetic flux or receiving magnetic flux from yoke 2 to yoke 2; Interior ring top board 5 and outer ring top board 6, for receiving magnetic flux from interior ring magnet 3 and outer shroud magnet 4, and send magnetic flux with right angle to voice coil loudspeaker voice coil 7; Voice coil loudspeaker voice coil 7, it is partially inserted in the space between interior ring magnet 3 and interior ring top board 5 and outer shroud magnet 4 and outer ring top board 6; Diaphragm 8, voice coil loudspeaker voice coil 7 is attached to it, and diaphragm 8 produces vibrations for the vertical movement according to voice coil loudspeaker voice coil 7; The ventilation hole 9 forming in frame 1 under diaphragm 8; And protector 10, wherein form audio emission hole 11, and for the protection of diaphragm 8.The groove (not shown) forming by the side surface of frame 1 or in frame 1 pulls out the lead-in wire (not shown) of voice coil loudspeaker voice coil 7, and this lead-in wire is soldered to splicing ear 12 along the outer surface of frame 1 respectively.Splicing ear 12 allows pair of outer lead-in wire (not shown) and lead-in wire (introducing and draw wire) to be connected to each other.
The side dome 8b that diaphragm 8 is included in the central dome 8a of central authorities' formation and forms around central dome 8a.
The size that the sound property of common Microspeaker is wherein installed the rear volume of the equipment (for example, mobile communication terminal etc.) of Microspeaker affects significantly.According to Helmholtz equation, rear volume has larger impact for the rigidity that is equal to of air.Rear volume is less, is equal to rigidity higher.This has reduced the acoustic pressure of low-frequency band, and has improved principal resonant frequency.
In traditional magnetic circuit, be difficult to increase the size of the whole magnet 3 and 4 in the frame of limited size, be therefore difficult to increase electromagnetic force.In addition,, because the side dome in traditional diaphragm is larger, so the effective area of diaphragm reduces, and reduced acoustic pressure.In the time moulding diaphragm with the monofilm of high stiffness, the vibrant characteristic degradation of low-frequency band.In addition,, if rear volume is little, the vibrant characteristic of low-frequency band is demoted more.
In addition, in traditional Microspeaker, by binder-treatment etc., the lead-in wire of voice coil loudspeaker voice coil is coupled to the lower surface of diaphragm, does not disturb yoke etc. when it is drawn out with box lunch.With implementing the processing for the lead-in wire of voice coil loudspeaker voice coil being bonded to diaphragm for the wire binder-treatment that with wire adhesive, lead-in wire is fixedly bonded to the basal surface of diaphragm.Although this processing needs high accuracy, manually carry out it.Therefore, processing time and cost have been increased.In addition, during processing, often there is defect.Therefore, this processing is the weakest part for the manufacture of the whole processing of Microspeaker.
In addition, because lead-in wire is fixed to diaphragm by wire adhesive, so in the time converting electrical signals to voice signal by vibrations, the quality of diaphragm and stiffness distribution imbalance.Therefore, occur the vibrations of separation, this makes sound property degradation.
Summary of the invention
Technical problem
An object of the present invention is to provide a kind of acoustic transducer, described acoustic transducer can maximize the volume of the magnet of wherein installing.
Another object of the present invention is to provide a kind of acoustic transducer, and described acoustic transducer comprises diaphragm, and described diaphragm has the effective area of increase by optimizing the width of side dome.
Another object of the present invention is to provide a kind of acoustic transducer, and described acoustic transducer can allow to have the diaphragm of multiple layers and easily superpose.
Another object of the present invention is to provide a kind of acoustic transducer, described acoustic transducer can allow the situation of not disturbing other elements drop-down go out the lead-in wire of coiler part.
Another object of the present invention is to provide a kind of acoustic transducer, and described acoustic transducer can go between to prevent by prolongation the lead effect diaphragm of coiler part.
Another object of the present invention is to provide a kind of acoustic transducer, and described acoustic transducer can improve the reliability of the connection between yoke assembly and frame.
Technical scheme
According to an aspect of the present invention, provide a kind of diaphragm for acoustic transducer, having comprised: primary diaphragm, it has the side dome forming as the middle body of plane surface with around described middle body; And secondary diaphragm, it is formed on the described central portion office of described primary diaphragm.
In addition, the described middle body of described primary diaphragm comprises: the opening forming in central authorities; And forming and be connected to the central base part of described side dome around described opening, described secondary diaphragm is installed in described central base part.
In addition, in the described side dome of described primary diaphragm, be formed for guiding the stepped portion of described secondary diaphragm.
In addition the apart predetermined space of described side dome of described secondary diaphragm and described primary diaphragm.
In addition, form described primary diaphragm by following manner: stacked the first sub-diaphragm that comprises TPUE (TPU) and comprise at least one the second sub-diaphragm of polyester (PET), Polyetherimide (PEI), polyether-ether-ketone (PEEK) and polyarylate.
In addition, described the first sub-diaphragm and described the second sub-diaphragm are sequentially located and are laminated to each other.
In addition the elastic layer that, described secondary diaphragm comprises the first and second metal levels and inserts between described the first and second metal levels.
In addition, described the first and second metal levels are aluminium laminations.
In addition, described elastic layer is foamed polystyrene (PS) layer.
In addition, the width of described side dome be equal to 10% to 20% or described diaphragm of the radius of described diaphragm minor axis radius 20% to 30%.
In addition, the scope of the thickness of described secondary diaphragm is from 0.25mm to 0.35mm.
According to another aspect of the present invention, provide a kind of acoustic transducer, having comprised: claim 1 11 any one described in diaphragm; The coiler part of installing around the basal surface of the middle body of described diaphragm; Magnetic circuit, it is configured such that magnetic flux is linked at least a portion of described coiler part with right angle; Frame, its have downside for hold the first holding portion of described magnetic circuit and upside for holding the second holding portion of described diaphragm; And protector, for protect described diaphragm on described frame.
In addition, the described coiler part that is attached to the rear surface of described diaphragm be mounted with the overlapping predetermined extent of described secondary diaphragm, described primary diaphragm is therebetween.
In addition, described predetermined degree of overlapping is equal to or greater than 50%.
In addition, described protector comprises audio emission hole, and described sound holes has the big or small size of the described middle body or the described secondary diaphragm that are equal to or greater than described diaphragm.
In addition, in one end of described frame, form guide groove, and the bending under side dome of the lead-in wire of described coiler part at least one times, and is extended to described guide groove.
According to another aspect of the present invention, a kind of acoustic transducer is provided, comprise: diaphragm unit, it comprises diaphragm and coiler part, described diaphragm has the side dome forming as the middle body of planar plate with around described middle body, described side dome has the thickness less than described middle body, around the basal surface of described middle body, described coiler part is installed; Magnetic circuit, it is configured such that magnetic flux is linked at least a portion of described coiler part with right angle; Frame, its have downside for hold the first holding portion of described magnetic circuit and upside for holding the second holding portion of described diaphragm unit, make to arrange described coiler part in gap; And protector, for protect described diaphragm unit on described frame.
In addition, described diaphragm comprises: primary diaphragm, and it has middle body and side dome; And secondary diaphragm, it is arranged on the top surface of described middle body of described primary diaphragm.
In addition, described diaphragm comprises: tertiary membrane sheet, and it has the opening forming in central authorities and the side dome forming around described opening, and forms central base part thereon; And the 4th diaphragm, it is installed on the top surface of described central base part, to form middle body.
In addition, form guide groove in one end of described frame, and the bending under described side dome of the lead-in wire of described coiler part at least one times, and extends to described guide groove.
In addition, limit conductive path and extend to described guide groove with the described lead-in wire that allows described coiler part, and do not contact with described magnetic circuit.
In addition, described magnetic circuit comprises: magnet; The top board of installing on described magnet; And yoke, it has the side plate of the base of described magnet being installed and having been formed gap around described floor installation with the side surface with respect to described magnet, described conductive path is included in the first guide groove forming on the described side plate of described yoke, and described lead-in wire extends through described the first groove or extends on described the first groove.
In addition, described conductive path comprises the second groove that is adjacent to formation with described first holding portion of described frame, for described wires guides is arrived to described guide groove.
In addition, forming described the second groove for the partition that described the first holding portion and described the second holding portion are separated.
In addition, described guide groove has stepped portion with respect to the described diaphragm base portion forming on described frame.
In addition, described the first groove and described the second groove face with each other and form.
In addition, described the first groove is a pair of groove of being separated by supporting bracket, and described the second groove comprises the inside groove for holding described supporting bracket.
In addition, described the second groove comprises and is inserted in described the first groove and is arranged on the inside protrusion in described the first groove.
Beneficial effect
According to the present invention, described acoustic transducer maximizes the volume of the described magnet of wherein installing, and has therefore improved the acoustic pressure of low-frequency band.
According to the present invention, described acoustic transducer improves the vibrant characteristic of low-frequency band, increases the effective area of described diaphragm, therefore improves the second acoustic pressure.According to the present invention, described acoustic transducer allows to have the diaphragm of multiple layers and easily superposes, and has therefore improved and has manufactured easness and the precision processed.According to the present invention, described acoustic transducer allows not disturb other elements and pulls out the described lead-in wire of described coiler part, therefore, stably sends the signal of telecommunication, and does not damage described lead-in wire or other elements.
According to the present invention, described acoustic transducer prevents diaphragm described in the described lead effect of described coiler part by extending described lead-in wire, therefore minimize the impact that described diaphragm applies for described acoustic pressure.
According to the present invention, described acoustic transducer comes in the reliability improving in intensity by firmly described yoke assembly being coupled to described frame.
Brief description of the drawings
Fig. 1 is the sectional view of traditional Microspeaker;
Fig. 2 uses according to the sectional view of the acoustic transducer of diaphragm of the present invention;
Fig. 3 is the perspective view of the yoke assembly of Fig. 2;
Fig. 4 and Fig. 5 are perspective view and the plane graphs of the frame of Fig. 2;
Fig. 6 and Fig. 7 are the views for the manufacture of the processing of diaphragm;
Fig. 8 is the view of another embodiment of diaphragm;
Fig. 9 to Figure 14 is other embodiment and view and the performance graph thereof of diaphragm;
Figure 15 to Figure 19 is the view of the embodiment of the position relationship between primary diaphragm, secondary diaphragm and coiler part;
Figure 20 is the detailed plan view of diaphragm;
Figure 21 is the diaphragm of Fig. 2 and the part enlarged drawing of protector;
Figure 22 and Figure 23 are the part enlarged drawings of coiler part;
Figure 24 is the end perspective view of the position relationship between diaphragm and coiler part;
Figure 25 is the perspective view of another embodiment of the yoke piece of Fig. 2;
Figure 26 and Figure 27 are perspective view and the plane graphs of another embodiment of the frame of Fig. 2;
Figure 28 and Figure 29 are the part enlarged drawings of another embodiment of coiler part;
Figure 30 is the end perspective view of the position relationship between diaphragm and the coiler part of another embodiment;
Figure 31 is illustrated in the figure that the sound pressure level (SPL) between prior art and the present invention compares; And
Figure 32 is illustrated in the figure that the total harmonic distortion (THD) between prior art and the present invention compares.
Embodiment
Below, describe the present invention in detail with reference to preferred embodiments and drawings.
Fig. 2 uses according to the sectional view of the acoustic transducer of diaphragm of the present invention, and Fig. 3 is the perspective view of the yoke assembly of Fig. 2, and Fig. 4 and Fig. 5 are perspective view and the plane graphs of the frame of Fig. 2.
The acoustic transducer of Fig. 2 comprises: frame 20; Yoke assembly 30,40 and 42, it is fixedly mounted in frame 20 times to form gap A, to form magnetic circuit; Coiler part 50, it is inserted in the A of gap at least in part; Diaphragm 60, coiler part 50 is arranged on its bottom (or basal surface) and locates, and diaphragm 60 is installed on frame 20; Protector 70, wherein forms audio emission hole 72, and protection diaphragm 60; Ventilation hole 80, it is formed in the frame 20 of diaphragm 60 belows; And splicing ear 90, the groove (not shown) that the lead-in wire (not shown) of coiler part 50 forms by the side surface of frame 20 or in frame 20 is drawn out, and is connected to splicing ear 90 along the outer surface of frame 20 respectively.Splicing ear 90 allows pair of outer lead-in wire (not shown) and lead-in wire (introducing and draw wire) to be connected to each other.At this, coiler part 50 and diaphragm 60 can be called as diaphragm unit.
Diaphragm 60 has primary diaphragm 62 and the stacked structure of the secondary diaphragm 64 installed on the top surface of primary diaphragm 62.With respect to primary diaphragm 62, in the shape of plane surface, form middle body, form side dome around middle body, and on the limit of side dome, be formed on the base portion 66 of installing regularly on frame 20.Secondary diaphragm 64 forms with the shape of plane surface, and is positioned at the central portion office of primary diaphragm 62.
Coiler part 50 is installed in the position corresponding with middle body, the limit of secondary diaphragm 64 or the installation site of secondary diaphragm 64 of primary diaphragm 62 on the rear surface of diaphragm 60.
Yoke assembly comprises: yoke 30, the side plate 30b that it has base 30a and form wall on the limit of base 30a; Magnet 40, it is installed on the top surface of base 30a to separate predetermined space to limit gap A with side plate 30b; And top board 42, it is installed on the top surface of magnet 40.Magnetic flux is by the gap A between top board 42 and side plate 30b.At least a portion of coiler part 50 is located with right angle with respect to magnetic flux.Can with shown in the shape of ellipse, circle, quadrangle and track etc. form yoke 30, magnet 40 and the top board 42 of yoke assembly.Can change according to the shape of yoke assembly the shape of diaphragm 60 and coiler part 50.
With a magnet type, magnet 40 is set, to improve magnetic field efficiency.Specifically, the area of the side dome of diaphragm 60 is less than the area as the middle body of plane surface, and the area of magnet 40 is slightly less than the area of middle body.The magnet 40 that, install has larger area.The area (or volume) of magnet is larger, and magnetic circuit is stronger.Therefore, can in whole frequency bands, improve the acoustic pressure of acoustic transducer.
Yoke 30 comprises fixing protrusion 32, for yoke 30 is fixed to frame 20.Fixing protrusion 32 is formed on the outer surface on top of side plate 30b, with parallel with long axis direction and/or short-axis direction.Can change as required the installation site of fixing protrusion 32.
In addition, the lead-in wire wider space of yoke 30 on side plate 30b comprises groove 34, interfering with each other to prevent lead-in wire and the side plate 30b of coiler part 50.Therefore, although coiler part 50 during the driving of acoustic transducer, shake, and lead-in wire also vibrations, groove 34 for prevent lead-in wire and yoke 30 (specifically, side plate 30b) contact with each other.Groove 34 is formed on the angle place that wherein major axis and minor axis intersect each other.To the position of groove 34 be described in the description of coiler part 50 again.
Next, use description to produce the relation between the radius Yr of magnetic circuit and the radius Fr of frame 20 of maximum electromagnetic force.The in the situation that of magnetic structure, the radius Yr of magnetic circuit be designed to frame 20 radius Fr about 75% to 85%.If the radius Yr of magnetic circuit is less, electromagnetic force reduces, and this makes to improve the acoustic pressure in low capacity.If the radius Yr of magnetic circuit is larger, the size of ventilation hole 80 reduces, and this reduces acoustic pressure, or the thickness of frame 20 reduces, and this makes product reliability degradation.The in the situation that of ellipse or quadrilateral structure, the minor axis radius of magnetic circuit be designed to frame 20 minor axis size about 75% to 85%.
As shown in Figures 4 and 5, frame 20 comprises: the first holding portion 22, for holding the yoke assembly (specifically, yoke 30) that wherein will install; The second holding portion 25, for holding diaphragm unit (specifically, diaphragm 60) and the protector 70 that wherein will install; Guide groove 27, extends outward for the lead-in wire that allows coiler part 50; And groove 28, extend to guide groove 27 via groove 34 for the lead-in wire that allows coiler part 50.At this, because frame 20 is made up of insulating material, so the lead-in wire of coiler part 50 can contact side surface and the basal surface of guide groove 27 or 28 in guide groove 27 or 28.Guide groove 27 has stepped portion with respect to pockets 29a.A pair of pockets 29a is formed on short-axis direction, and a pair of pockets 29b is formed on long axis direction.Pockets 29a and 29b hold guiding protrusion 68a and the 68b (referring to Fig. 8) of diaphragm 60 described later.
The first holding portion 22 and the second holding portion 25 are cut off 23 separations.In cutting off 23, form multiple fixed grooves 24, fixed groove 24 is for holding the fixing protrusion 32 for the yoke 30 of tie-down yoke 30.In addition, in cutting off 23, form ventilation hole 80.Ventilation hole 80 penetrates the first holding portion 22 and the second holding portion 25.In addition, in cutting off 23, the position corresponding with the groove 34 of yoke 30 forms groove 28.The angle place of the frame 20 that, major axis and minor axis intersect each other therein forms groove 28.
In the time that the inner surface of the first holding portion 22 contacts with the outer surface of side plate 30b and fixes protrusion 32 and fixedly inserted into fixed groove 24, yoke assembly is fixedly mounted on frame 20.
The second holding portion 25 comprises diaphragm base portion 26, and the base portion 66 of diaphragm 60 has been installed on it regularly.After the base portion 66 of diaphragm 60 is fixedly mounted in diaphragm base portion 26, protector 70 is fixedly mounted on it.
Fig. 6 and Fig. 7 are the views for the manufacture of the processing of diaphragm.
Fig. 6 shows the processing that is used to form primary diaphragm 62.Use the stacked film of the first sub-diaphragm 62a and the second sub-diaphragm 62b to mould primary diaphragm 62, the first sub-diaphragm 62a comprises TPUE (TPU) to minimize the rigidity of diaphragm, the second sub-diaphragm 62b comprise Polyetherimide (PEI), polyester (PET), polyether-ether-ketone (PEEK) and polyarylate at least one with improve reliability.Specifically, because soft TPU may be attached to mould during moulding processing, so it is always sequentially layered on the top surface of the second sub-diaphragm 62b.
Moulding after processing, primary diaphragm 62 has middle body C, side dome S and base portion 66.As shown in Figure 6, in the time that the width of side dome S reduces, use limit diaphragm material, this has improved the vibrant characteristic of low-frequency band.In addition, because diaphragm has large flat structures in middle body C, so its effective area increases, this has improved acoustic pressure and has obtained high sound quality.
Fig. 7 illustrates the processing that is used to form secondary diaphragm 64.The rigidity of the stacked middle body C with compensation primary diaphragm 62 of the first and second metallic plate 64a and 64b and the elastic layer 64c inserting betwixt, therefore prevents audio distortions.At this, the first metallic plate 64a can be set or at the second metallic plate 64b.
The first and second metallic plate 64a and 64b are by the metal level forming such as the light and hard material of aluminium.When manufacturing process during when easily aluminium lamination is out of shape, there is foamed polystyrene (PS) material of good restoring force compressed and be laminated thereon.
In addition, consider machinability, the thickness of the secondary diaphragm 64 after compression is preferably maintained at 0.25mm to 0.35mm.If the thickness of secondary diaphragm 64 is less than 0.25mm, in the time that secondary diaphragm 64 is attached to primary diaphragm 62, out of hand.For example, in the time using guiding device, if the thickness of secondary diaphragm 64 is too little, guiding device can not normally guide secondary diaphragm 64.Use additive method, be difficult to detect the correct position of secondary diaphragm 64.On the contrary, if its thickness is greater than 0.35mm, secondary diaphragm 64 takies large region, and the elastic layer 64c being made up of PS has low rigidity, makes to increase to cut apart, and may in high frequency band, produce dipping.
Fig. 8 is the sectional view of another embodiment of the diaphragm of Fig. 2.As shown in Figure 8, diaphragm 63 comprises: middle body C1, and it is plane surface, and forms opening in central authorities; Side dome S, it is formed on the limit of middle body C1; And base portion 66, it is formed on the limit of side dome S.At this, generally can form diaphragm 63 with circle.When form opening on middle body C1 time, the weight of middle body C1 reduces.In addition,, in the time that middle body C1 and secondary diaphragm 64 are attached to one another, opening is used for preventing that such as adhesive etc. from causing folding line.
Fig. 9 to Figure 14 is other embodiment of diaphragm and the view of performance graph thereof.
Fig. 9 is the topology view of circular film, and Figure 10 and Figure 11 are the performance graph of the diaphragm of Fig. 9.
As shown in Figure 10, in the time that the width of the side dome S of diaphragm reduces, the rigidity of diaphragm increases, and therefore low-frequency band reduces.Meanwhile, in the time that the width of side dome S reduces, the size of magnetic circuit reduces, and therefore power reduces.Therefore, total frequency band acoustic pressure reduces, but due to low rigidity, strengthens again low-frequency band.It is therefore preferable that the ratio that is identified for acoustic pressure to remain on constantly the radius R of the diaphragm in main acoustic pressure frequency band (500Hz to 5kHz) and the width W of side dome S.
Can in Figure 11, find out, the semicircle side dome S structure with about width W of 10% to 20% of the radius R that is equal to diaphragm keeps constant acoustic pressure in low-frequency band 500Hz and high frequency band 5kHz.
Figure 12 is corresponding to the situation that forms diaphragm with elliptical shape.Because with the similar reason of Figure 10, preferably, be identified for acoustic pressure to remain on constantly the ratio of the radius R of the minor axis part in main acoustic pressure frequency band (500Hz to 5kHz) and the width W of side dome S.In this embodiment, be that minor axis part has large impact for the quality of the sound at oval diaphragm for the reason of calculating W/R ratio with respect to minor axis part, that is, the restraining force of oval diaphragm is larger in minor axis part.Therefore,, at the during the design of diaphragm, if meet the condition of minor axis part, meet most of conditions of major axis part.
In Figure 14, need semicircle side dome S structure, it has about width W of 20% to 30% of the length R that is equal to minor axis part.In 20% to 30% scope, improve the acoustic pressure of low-frequency band (500Hz), and the acoustic pressure of locating at high frequency band (5kHz) reduce slack-off.
The width W of side dome S can be optimized, and the effective area of diaphragm can be maximized with size adjustment.Can maximize by maximizing the size of the effective area of diaphragm and the magnet 40 of maximization yoke assembly as above the size of magnetic circuit.
As follows for limiting big or small reason.If the width W of side dome S is less than above-mentioned value, side dome S limiting diaphragm, to reduce the movement of diaphragm, and if the width W of side dome S is larger, the effective area of middle body C reduces acoustic pressure, cause shaking insufficient space, and defect increases because vibrations width improves.
Figure 15 to Figure 19 is the view of the embodiment of the position relationship between primary diaphragm, secondary diaphragm and coiler part.
As shown in Figure 15, in the time that secondary diaphragm 64 is attached to the middle body C of primary diaphragm 62, use independently guiding device (not shown) to determine correct position.For this object, the interval between side dome S and the external diameter (or limit) of internal diameter and secondary diaphragm 64 must be equal to or greater than 0.2mm.
As shown in Figure 16, guide step part 67 is provided to secondary diaphragm 64 to be attached to the middle body C of primary diaphragm 62, and does not use independently guiding device.Guide step part 67 is formed on the inside place of side dome S, between side dome S and middle body C.Therefore, side dome S itself is for guiding secondary diaphragm 64.
As shown in Figure 17, secondary diaphragm 64 and coiler part 50 predetermined extent that must overlap each other, and the middle body C of primary diaphragm 62 is therebetween.The hatched example areas B instruction overlapping region of secondary diaphragm 64, and W2 instruction Non-overlapping Domain.Because secondary diaphragm 64 has high rigidity, so preferably, the position of coiler part 50 is determined in the outside based on secondary diaphragm 64, make coiler part 50 winding width 50% or be more very much not exposed to the outside of secondary diaphragm 64., W2/W3 is preferably less than 0.5.
As shown in Figure 18, the region corresponding with coiler part 50 can be included on the limit of secondary diaphragm 64 substantially,, the width of region B can be substantially the same with the width of coiler part 50, or as shown in Figure 19, the region corresponding with coiler part 50 can entirety be included in secondary diaphragm 64, that is, the width of region B can be identical with the width of coiler part 50.
Figure 20 is the detailed plan view of diaphragm.
In the time the primary diaphragm of low rigidity 62 being attached to the diaphragm base portion 26 of frame 20 with adhesive as adhesive, probably primary diaphragm 62 can be out of shape and with its coupling.Also be difficult to determine the correct position of primary diaphragm 62.Therefore, diaphragm 60 comprises guiding protrusion 68a and 68b in the position corresponding with the pockets 29a of frame 20 and 29b.Guiding protrusion 68a and 68b are for being coupled to frame 20 in correct position by diaphragm 60.
Figure 21 is the diaphragm of Fig. 2 and the part zoomed-in view of protector.The radius R 1 (short-axis direction) in the audio emission hole 72 forming in protector 70 is greater than the radius R 2 (short-axis direction) of the secondary diaphragm 64 on the middle body C of diaphragm 60.Must set up identical relation with respect to long axis direction radius.The size in the audio emission hole 72, forming in protector 70 must at least be equal to or greater than the size of the secondary diaphragm corresponding with it 64.
Require the reason of such magnitude relationship as follows.When the thickness of the middle body C of diaphragm 60, when specifically the thickness of secondary diaphragm 64 increases, need the vibrations space of secondary diaphragm 64.Therefore,, in order to prevent that the machinery between secondary diaphragm 64 and protector 70 from disturbing, the size in audio emission hole 72 must be equal to or greater than the size of secondary diaphragm 64.
Figure 22 and Figure 23 are the part zoomed-in views of coiler part.As shown, coiler part 50 comprises coil windings part 51 and the pair of lead wires 52 and 54 that is connected to winding part 51.
As mentioned above, because maximize the effective area of magnetic circuit and diaphragm, so can increase the internal diameter of winding part 51.In the time that the internal diameter of winding part 51 increases, the winding width of every circle increases, and therefore, thicker coil is for keeping identical resistance and identical whole height.Therefore, increased the length of the coil of the power that is applied in, this causes forceful electric power magnetic force.This contributes to the increase of low-frequency band linearly.Meanwhile, because weight is along with electromagnetic force also increases, so acoustic pressure increases indistinctively in midband.The width of side dome S is because the increase of the internal diameter of coiler part 50 reduces.Therefore, as primary diaphragm 62, use the mould of low rigidity, to minimize the rigidity of loud speaker, improve thus the sound property of low-frequency band.
As shown, lead-in wire 52 is pulled out by the upside of the winding part 51 from parallel with the long axis direction of winding part 51 respectively with 54, and has sweep 53 and 55 at immediate sweep or the angle place of winding part 51.After sweep 53 and 55, lead-in wire 52 and 54 finally extends through the guide groove 27 forming accordingly with the short-axis direction of frame 20, makes their termination ends be connected to external connection terminals 90.
Lead-in wire 52 and 54 extends through the space being limited by the groove 34 of yoke 30 or extends on groove 34, extend through the space that limited by the groove 28 of frame 20 or on groove 28 or approach the side surface of groove 28 or extend contiguously with the side surface of groove 28, extend accordingly with the inner surface of the second holding portion 25 of frame 20, and be connected to outside by guide groove 27.
Figure 24 is the end perspective view of the position relationship between diaphragm and coiler part.As shown in Figure 24, the top surface of the winding part 51 of Figure 22 is installed on the middle body C of diaphragm 60, and the sweep 53 and 55 of the lead-in wire 52 and 54 pulling out from winding part 51 is arranged in the region corresponding with side dome S.At this, lead-in wire 52 and 54 not with diaphragm 60 contiguously, be not coupled to any part and extend.
Figure 25 is the perspective view of another embodiment of the yoke piece of Fig. 2, and Figure 26 and Figure 27 are perspective view and the plane graphs of another embodiment of the frame of Fig. 2.Figure 25 to Figure 27 illustrates the circular acoustic transducer except oval acoustic transducer as above.The sectional view of the oval acoustic transducer of Fig. 2 and the sectional view of circular acoustic transducer are almost identical.
Figure 28 and Figure 29 are the part enlarged drawings of another embodiment of coiler part, and Figure 30 is the end perspective view of the position relationship between diaphragm and coiler part.
Yoke assembly in Figure 25 comprises: yoke 130, and it has base 130a and the side plate 130b corresponding with having the base 30a of Fig. 3 and the yoke 30 of side plate 30b; Magnet 140, it is installed on the top surface of base 130a to separate predetermined space to limit gap B with side plate 130b; And the top board 142 of installing on the top surface of magnet 140.
Magnet 140 is corresponding to the magnet 40 of Fig. 3, and carries out identical function.
Yoke 130 comprises the fixing protrusion 132 corresponding with the fixing protrusion 32 of yoke 30.Fixing protrusion 132 can form with circle framework shape as shown in Figure 25, or can form with different shapes in different positions according to the shape of yoke 130.
In addition, yoke 130 comprises the groove corresponding with the groove 34 of Fig. 3 134.Therefore,, although shake coiler part 150 and also shake lead-in wire during the driving of acoustic transducer, groove 134 contacts with each other for preventing lead-in wire and yoke 130 (specifically, side plate 130b).Lead-in wire extends through groove 134 or on groove 134, and this makes to prevent the contact between lead-in wire and yoke 130.
In addition, yoke 130 is included in the supporting bracket 132a between a pair of groove 134.Supporting bracket 132a is inserted into and is arranged in groove 129c so that yoke 130 is coupled to frame 120, separates a pair of groove 134, and the width of confinement groove 134.
As shown in Figure 26 and Figure 27, frame 120 comprise first holding portion 122 corresponding with the first holding portion 22, with the second holding portion 125 corresponding to the second holding portion 25, with guide groove 127 corresponding to guide groove 27 and the groove 128 corresponding with groove 28.
The first holding portion 122 and the second holding portion 125 are cut off 123 and separate.Form multiple fixed grooves 124 cutting off in 123, with the fixing protrusion 132 that holds yoke 130 with tie-down yoke 130.In addition, ventilation hole 180 is formed on and cuts off in 123, penetrates the first holding portion 122 and the second holding portion 125.In addition, groove 128 is preferably formed in the position corresponding with the groove 134 of yoke 130 cutting off in 123, and lead-in wire is extended to guide groove 127.Guide groove 127 comprises guide groove 129, and guide groove 129 has stepped portion with respect to diaphragm base portion 126, and lead-in wire is directed into guide groove 127 by groove 128 and guide groove 129.This is corresponding to conductive path.Guide groove 127 is formed integrally as with guide groove 129, and guide groove 129 has stepped portion with respect to diaphragm base portion 26.
In addition, groove 128 comprises: a pair of inner protrusion 128a and 128b, for being inserted in a pair of groove 134 of yoke 130; And internal recess 128c, it is formed between inner protrusion 128a and 128b, and the supporting bracket 132a of yoke 130 fixedly inserted in internal recess 128c.Because inner protrusion 128a and 128b are inserted in the top of groove 134, so can prevent the contact between lead-in wire and yoke 130.In addition, internal recess 128c is for strengthening the connection between yoke 130 and frame 120.
In the time that the outer surface of the inside surface of the first holding portion 122 and the side plate 130b of yoke 130 contacts and fixes protrusion 132 and fixedly inserted into fixed groove 124, yoke assembly is fixedly mounted on frame 120.
The second holding portion 125 comprises diaphragm base portion 126, in diaphragm base portion 126, the base portion 166 of diaphragm 160 has been installed regularly.After the base portion 166 of diaphragm 160 is fixedly mounted in diaphragm base portion 126, protector 170 is fixedly mounted on it.As shown in Figure 28 and Figure 29, coiler part 150 comprises coil windings part 151 and the pair of lead wires 152 and 154 that is connected to winding part 151, and they are corresponding to winding part 51 and lead-in wire 52 and 54.
As shown, lead-in wire 152 and 154 is pulled out from the upside of winding part 151 respectively., the pilot point of lead-in wire 152 and 154 is upsides of winding part 151.Lead-in wire 152 and 154 comprises the sweep 153 and 155 being positioned under side dome S.
Lead-in wire 152 and 154 and pilot point is substantially parallel or a little less than pilot point extend.At this, because sweep 153 and 155 is positioned under side dome S, so lead-in wire 152 and 154 can not be drawn out with basal surface and the side surface of side dome S contiguously.
Lead-in wire 152 and 154 can (outside of base portion 166 or side dome S) extend to bottom from the top adjacent with guide groove 127 after sweep 153 and 155, and finally extend through the guide groove 127 forming accordingly with frame 120, make their termination ends be connected to outside link 190.
Lead-in wire 152 and 154 extends through the space being limited by the groove 134 of yoke 130 or extends on groove 134, extend through the space that limited by the groove 128 of frame 120 or on groove 128 or approach the side surface of groove 128 or extend contiguously with the side surface of groove 128, extend accordingly with the inner surface of the second holding portion 125 of frame 120, and be connected to outside by guide groove 127.
As shown in Figure 30, the top surface of the winding part 151 of Figure 28 is installed on the middle body C of diaphragm 160, and the sweep 153 and 155 of the lead-in wire 152 and 154 pulling out from winding part 151 is positioned at the region corresponding with side dome S.At this, lead-in wire 152 and 154 not with diaphragm 160 contiguously, be not coupled to any part and extend.
Figure 31 and Figure 32 are Performance Ratio between prior art and the present invention of Fig. 1 figures.Figure 31 is illustrated in the figure that the sound pressure level (SPL) between prior art and the present invention compares, and Figure 32 is illustrated in the figure that the total harmonic distortion (THD) between prior art and the present invention compares.The diaphragm of prior art and diaphragm of the present invention have identical size.The diaphragm of prior art is made up of PE.The rear volume that is connected to each acoustic transducer is 1cc.
As shown in Figure 31, acoustic transducer according to the present invention minimizes because the increase of the area of the middle body of diaphragm 60 causes the vibrations of cutting apart that occur with the stacked diaphragm 60 of high rigidity of flat type.As a result, acoustic transducer has been realized the acoustic pressure uniformity in the frequency band after resonance frequency, has therefore improved sound property.
As shown in Figure 32, in the time that the internal diameter of coiler part 50 increases due to the maximization of magnetic circuit, side dome narrows.Therefore, use according to acoustic transducer of the present invention the diaphragm 60 being formed by low rigid film.Therefore, acoustic transducer minimizes rigidity, and improves the sound property of low-frequency band.
Although illustrate and described the present invention with preferred embodiment by reference to the accompanying drawings, the invention is not restricted to this, and limited by appended claim.Therefore, those skilled in the art can understand, in the case of not departing from the spirit and scope of the present invention defined by the appended claims, can carry out various amendments for the present invention.
Claims (25)
1. for a diaphragm for acoustic transducer, comprising:
Primary diaphragm, it has the side dome forming for the middle body of plane surface with around described middle body; And
Secondary diaphragm, it is formed on the described central portion office of described primary diaphragm;
Wherein, the described middle body of described primary diaphragm comprises: the opening forming in central authorities; And central base part, on the basal surface of described central base part, coiler part is installed, described central base part forms and is connected to described side dome around described opening, and described secondary diaphragm is installed in described central base part and covers described opening.
2. diaphragm according to claim 1 wherein, is formed for guiding the stepped portion of described secondary diaphragm in the described side dome of described primary diaphragm.
3. diaphragm according to claim 1, wherein, the described side dome of described primary diaphragm and the apart predetermined space of described secondary diaphragm.
4. diaphragm according to claim 1, wherein, form described primary diaphragm by following manner: stacked the first sub-diaphragm that comprises thermoplastic polyurethane elastomer and comprise at least one the second sub-diaphragm in polyester PET, Polyetherimide PEI, polyether-ether-ketone PEEK and polyarylate.
5. diaphragm according to claim 4, wherein, described the first sub-diaphragm and described the second sub-diaphragm are sequentially located and are laminated to each other.
6. diaphragm according to claim 1, wherein, the elastic layer that described secondary diaphragm comprises the first and second metal levels and inserts between described the first and second metal levels.
7. diaphragm according to claim 6, wherein, described the first and second metal levels are aluminium laminations.
8. diaphragm according to claim 6, wherein, described elastic layer is foamed polystyrene (PS) layer.
9. diaphragm according to claim 1, wherein, the width of described side dome be equal to 10% to 20% or described diaphragm of the radius of described diaphragm minor axis radius 20% to 30%.
10. diaphragm according to claim 1, wherein, the scope of the thickness of described secondary diaphragm is from 0.25mm to 0.35mm.
11. 1 kinds of acoustic transducers, comprising:
For the diaphragm of acoustic transducer, the described diaphragm for acoustic transducer comprises:
Primary diaphragm, it has the side dome forming for the middle body of plane surface with around described middle body; And
Secondary diaphragm, it is formed on the described central portion office of described primary diaphragm;
Wherein, the described middle body of described primary diaphragm comprises: the opening forming in central authorities; And central base part, on the basal surface of described central base part, coiler part is installed, described central base part forms and is connected to described side dome around described opening, and described secondary diaphragm is installed in described central base part and covers described opening;
Magnetic circuit, it is configured such that magnetic flux is linked at least a portion of described coiler part with right angle;
Frame, its have downside for hold the first holding portion of described magnetic circuit and upside for holding the second holding portion of described diaphragm; And
Protector, for protecting described diaphragm on described frame.
12. acoustic transducers according to claim 11, wherein, the described coiler part that is attached to the rear surface of described diaphragm be mounted with the overlapping predetermined extent of described secondary diaphragm, described primary diaphragm is therebetween.
13. acoustic transducers according to claim 12, wherein, described predetermined extent is equal to or greater than 50%.
14. acoustic transducers according to claim 11, wherein, described protector comprises audio emission hole, described sound holes has the big or small size of the described middle body or the described secondary diaphragm that are equal to or greater than described diaphragm.
15. acoustic transducers according to claim 11 wherein, form guide groove in one end of described frame, and the bending under side dome of the lead-in wire of described coiler part at least one times, and is extended to described guide groove.
16. 1 kinds of acoustic transducers, comprising:
Diaphragm unit, it comprises diaphragm and coiler part, described diaphragm has the side dome forming for the middle body of planar plate with around described middle body, and described side dome has the thickness less than described middle body, and described coiler part is installed around the basal surface of described middle body;
Magnetic circuit, it is configured such that magnetic flux is linked at least a portion of described coiler part with right angle;
Frame, its have downside for hold the first holding portion of described magnetic circuit and upside for holding the second holding portion of described diaphragm unit, make to arrange described coiler part in gap; And
Protector, for protecting described diaphragm unit on described frame;
Wherein, described diaphragm comprises: primary diaphragm, and it has middle body and side dome; And secondary diaphragm, it is arranged on the top surface of described middle body of described primary diaphragm;
Wherein, described diaphragm comprises: tertiary membrane sheet, and it has the opening forming in central authorities and the side dome forming around described opening, and forms central base part thereon; And the 4th diaphragm, it is installed on the top surface of described central base part, to form middle body.
17. acoustic transducers according to claim 16, wherein, form guide groove in one end of described frame, and the bending under described side dome of the lead-in wire of described coiler part at least one times, and extends to described guide groove.
18. acoustic transducers according to claim 17, wherein, limit conductive path and extend to described guide groove with the described lead-in wire that allows described coiler part, and do not contact with described magnetic circuit.
19. acoustic transducers according to claim 18, wherein, described magnetic circuit comprises: magnet; The top board of installing on described magnet; And yoke, it has the side plate of the base of described magnet being installed and having been formed gap around described floor installation with the side surface with respect to described magnet, described conductive path is included in the first groove forming on the described side plate of described yoke, and described lead-in wire extends through described the first groove or extends on described the first groove.
20. acoustic transducers according to claim 19, wherein, described conductive path comprises the second groove that is adjacent to formation with described first holding portion of described frame, for described wires guides is arrived to described guide groove.
21. acoustic transducers according to claim 20, wherein, are forming described the second groove for the partition that described the first holding portion and described the second holding portion are separated.
22. acoustic transducers according to claim 20, wherein, described guide groove has stepped portion with respect to the diaphragm base portion forming on described frame.
23. acoustic transducers according to claim 20, wherein, described the first groove and described the second groove face with each other and form.
24. acoustic transducers according to claim 20, wherein, described the first groove is a pair of groove of being separated by supporting bracket, and described the second groove comprises the inside groove for holding described supporting bracket.
25. acoustic transducers according to claim 20, wherein, described the second groove comprises and is inserted in described the first groove and is arranged on the inside protrusion in described the first groove.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2008-0101346 | 2008-10-15 | ||
| KR1020080101346A KR101033867B1 (en) | 2008-10-15 | 2008-10-15 | Diaphrahm for sound converter |
| KR10-2008-0103000 | 2008-10-21 | ||
| KR1020080103000A KR101012862B1 (en) | 2008-10-21 | 2008-10-21 | Sound converter |
| PCT/KR2009/005941 WO2010044623A2 (en) | 2008-10-15 | 2009-10-15 | Diaphragm for sound converter and sound converter including the same |
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| Publication Number | Publication Date |
|---|---|
| CN102187687A CN102187687A (en) | 2011-09-14 |
| CN102187687B true CN102187687B (en) | 2014-09-03 |
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| CN200980141189.3A Active CN102187687B (en) | 2008-10-15 | 2009-10-15 | Diaphragm for sound converter and sound converter including the same |
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| CN (1) | CN102187687B (en) |
| WO (1) | WO2010044623A2 (en) |
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|---|---|---|---|---|
| CN102598709B (en) * | 2010-08-18 | 2014-12-24 | 易音特电子株式会社 | Acoustic transducer device |
| KR101213682B1 (en) * | 2012-06-08 | 2012-12-18 | 태경에프앤씨 주식회사 | Laminating film of polymer film and tpu for diaphragm material of audio device and thereof |
| KR101395050B1 (en) * | 2012-10-25 | 2014-05-19 | 주식회사 이엠텍 | Sound transducer with ventilation structure |
| CN103347233B (en) * | 2013-06-14 | 2016-08-24 | 歌尔声学股份有限公司 | The diaphragm of loudspeaker |
| CN105611463B (en) * | 2016-03-21 | 2019-11-15 | 歌尔股份有限公司 | A kind of manufacturing method of vibrating diaphragm and vibrating diaphragm |
| CN106507256A (en) * | 2016-12-05 | 2017-03-15 | 歌尔丹拿音响有限公司 | The speaker diaphragm and loudspeaker of cone basin formula |
| WO2019047082A1 (en) * | 2017-09-06 | 2019-03-14 | 深圳市同富达电子科技有限公司 | Method for forming aluminum surface selenium treated nano coating for improving low frequency extension of earphone |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1638530A (en) * | 2003-12-24 | 2005-07-13 | 日本先锋公司 | Speaker apparatus |
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| DE4329637A1 (en) * | 1993-09-02 | 1995-03-09 | Sennheiser Electronic | Method for producing a contoured diaphragm for electroacoustic transducers such as headphones, and a transducer diaphragm produced in accordance with this method |
| JP4780067B2 (en) * | 2006-08-30 | 2011-09-28 | 日本ビクター株式会社 | Electroacoustic transducer and diaphragm |
| KR100788476B1 (en) * | 2006-09-04 | 2007-12-24 | 주식회사 이엠텍 | Structure of high quality sound microspeaker |
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2009
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1638530A (en) * | 2003-12-24 | 2005-07-13 | 日本先锋公司 | Speaker apparatus |
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| WO2010044623A3 (en) | 2010-06-10 |
| CN102187687A (en) | 2011-09-14 |
| WO2010044623A2 (en) | 2010-04-22 |
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