CN102802104A - Moving-coil loudspeaker with area-alterable capacitive vibration sensor - Google Patents
Moving-coil loudspeaker with area-alterable capacitive vibration sensor Download PDFInfo
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- CN102802104A CN102802104A CN2012102918625A CN201210291862A CN102802104A CN 102802104 A CN102802104 A CN 102802104A CN 2012102918625 A CN2012102918625 A CN 2012102918625A CN 201210291862 A CN201210291862 A CN 201210291862A CN 102802104 A CN102802104 A CN 102802104A
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Abstract
The invention provides a moving-coil loudspeaker with an area-alterable capacitive vibration sensor, of which the magnetic path structure is an outer magnetic path or an inner magnetic path. A coil is wound on a conductive voice coil framework to form a voice coil, a capacitive/moving signal converting circuit is provided, the area-alterable capacitive vibration sensor positioned in the same axial direction as the conductive voice coil framework and used for measuring the displacement of the voice coil is arranged between a magnetic-conductive column and a magnetic-conductive upper plate, and capacitance variable output by the area-alterable capacitive vibration sensor is transmitted to the input terminal of the capacitive/moving signal converting circuit. As the capacitance value of the area-alterable capacitive vibration sensor and the displacement of the voice coil form a linear relationship, wide-range linear output is achieved, and the measurement requirement of a large-amplitude highly-dynamic low-frequency loudspeaker is particularly satisfied; and a moving signal of the loudspeaker voice coil can be obtained through detecting the output of the sensor by the capacitive/moving signal converting circuit to serve as a feedback signal to be input into the feedback input terminal of a moving servo amplifier, so that the closed-loop control of the loudspeaker is realized.
Description
Technical field
The present invention relates to the loudspeaker techniques field, especially relate to a kind of coil-moving speaker that carries variable area formula capacitor vibration transducer.
Background technology
The distortion factor of digital source of sound and power amplifier all can reach below 0.01% easily in the playback link in electroacoustic field.Yet, being in the loud speaker of sound reproduction link least significant end, generally all greater than more than 1%, ultralow frequency range reaches more than 5% the distortion factor especially, becomes the neck bottle that the sound system fidelity is further improved.
Coil-moving speaker is divided into two kinds of internal magnetization and external magnetic types according to magnetic structure; And internal magnetization can be divided into axial charging magnetic circuit and radial magnetizing magnetic circuit according to the magnetizing direction of magnet, can be further divided into long magnetic gap short coil design and short magnetic gap long loop design by the length of voice coil loudspeaker voice coil and magnetic gap relation.Usually by forming with lower component: vibrating diaphragm, speech coil framework, coil, basin frame, ring, centring disk, permanent magnet, magnetic conduction upper plate, magnetic conduction lower plate, conducting magnetic column are formed.Also be provided with magnetic conductor bowl for internal magnetization, coil is wound on the speech coil framework, and is positioned to be called in the annular gap of magnetic gap between conducting magnetic column and the magnetic conduction upper plate, the radial magnetic field that is distributing in the magnetic gap and produced by permanent magnet.Ring and centring disk all play a part to support voice coil loudspeaker voice coil, keep voice coil loudspeaker voice coil to be suspended in the centre of magnetic gap, prevent voice coil loudspeaker voice coil and conducting magnetic column, magnetic conductive board generation mechanical friction.Behind the logical upward signal code of voice coil loudspeaker voice coil, with the effect that receives electromagnetic force.Electromagnetic force is delivered to vibrating diaphragm through speech coil framework, and vibrating diaphragm is done forced vibration under the effect of actuating force, and drive air is sounded.The speech coil framework of coil-moving speaker can use conductive metal sheet or biochip to reel and form, and in general application, only uses as mechanical part, does not stress to be connected with the signal of circuit.Magnetic conduction upper plate, conducting magnetic column are metal parts but only make simple magnetic conductive component and use, and do not stress equally to be connected with the signal of circuit.The structure of coil-moving speaker is determining it can have following distortion:
(1) distortion that causes by actuating force: mainly be inhomogeneous, and the non-linear of coil inductance causes by the magnetic gap Distribution of Magnetic Field.Though adopt symmetrical magnetic circuits can reduce a part of distortion, be subject to cost and other factors, the linear stroke of loud speaker is always limited, then exceeds the range of linearity and causes distortion greatly dynamically the time through regular meeting for the woofer that significantly vibrates.
(2) the non-linear distortion that causes of suspension system: because the restriction of material property; The restoring force of passive ring and centring disk is the magnetic hysteresis loop shape with the vibrating diaphragm displacement relation; And non-linear relation is particularly evident when particularly the low-frequency range vibrating diaphragm significantly vibrates.
(3) transient distortion: vibrating diaphragm is done forced vibration under the effect of voice coil loudspeaker voice coil actuating force, and vibrational system has certain mass and certain damping, can not follow fast-changing input signal vibration rapidly, always has certain delay.The loud speaker that the forward position rising characteristic is slow because of reaching stable state acoustic pressure overlong time, causes the disappearance of sound head signal; Then along the loud speaker of falling characteristic difference, after the input signal disappearance, vibration damping is poor, causes the sound conditions of streaking.
(4) frequency response distortion: actual loud speaker has different responses to the input signal of different frequency, forms the frequency response curve that height rises and falls.Can not truly reduce the energy distribution ratio of various frequency sound waves in original signal, also a kind of at last distortion.This distortion mainly is that low-frequency range is then because of the speaker operation underfrequency because the vibration of cutting apart of vibrating diaphragm produces at high band, and working frequency points causes away from the oscillating mass controlled area gets into the elasticity controlled area.
Using conventional way to reduce loudspeaker distortions always attends to one thing and lose sight of another; The oscillating mass that for example often will increase loud speaker for expansion loud speaker low-frequency minimum (that is reducing frequency response distortion) reduces resonance frequency, and minus effect is to cause decrease in efficiency and transient distortion aggravation.And adopt feedback technique loud speaker to be included in the feedback control loop of amplifier, and then can correct the inherent distortion of loud speaker comprehensively, improve the fidelity of whole sound system.The loudspeaker feedback signal acquisition behavior has following method at present:
(1) to disclose publication number be the speaker unit of CN1377566A to the Chinese patent communique: near loud speaker, install pick-up additional, pick up the voice signal that loud speaker sends, convert the feedback end that the signal of telecommunication feeds back to power amplifier then into.There is following shortcoming in the method: voice signal sends from loud speaker will be through could arriving pick-up after a while, and there is long time lag in the feedback of signal, and phase relation is complicated, and it is dark that feedback generally can not Jia Detai, otherwise cause the concussion of system easily.Therefore the improvement of negative feedback sound reproduction effect and not obvious.Simultaneously, also there is distortion in the pickup process, and the microphone price of low distortion is higher.In addition, extraneous sound noise is easy to be incorporated in the system through pick-up, has reduced the signal to noise ratio of system.
(2) to disclose publication number be the moving reaction type loud speaker of CN85204257U to the Chinese patent communique: it is on common coil-moving speaker basis; Increase velocity coils; The velocity coils output voltage is proportional to the loudspeaker voice coil vibration velocity, and feedback signal feeds back to amplifier in through after the first order differential.Magnetic circuit of the extra increase of the method and coil, the complex structure manufacturability is poor, and there is phenomenon pockety equally in the magnetic circuit that tests the speed, causes distortion.
(3) the Chinese patent communique discloses the low-distortion loudspeaker vibration degeneration factor assembly that publication number is CN2319986y: its uses reflective photoelectric sensor to detect the displacement of vibrating diaphragm.The method be can predict and the cone angle as the vibrating diaphragm of reflecting surface, the influence of diaphragm materials reflection characteristic are easy to receive; Used ON2152 as described transducer in the embodiment; Listed the Ic-D figure of blank sheet of paper 90% reflection in the specification of ON2152 with direct reflection; Can confirm the influence that it receives reflecting surface, its output dimension is unsatisfactory.
Summary of the invention
The object of the present invention is to provide a kind of coil-moving speaker that carries variable area formula capacitor vibration transducer; This loud speaker comprises a variable area formula capacitor vibration transducer; Its capacitance and voice coil loudspeaker voice coil displacement are linear; Have large-scale linear output, satisfied the big dynamic woofer measurement requirement of large amplitude especially, the output of this transducer just can obtain the motor message of loudspeaker voice coil through the detection of electric capacity/motor message change-over circuit; Be input to the feedback input end of motion servo formula amplifier as feedback signal, thereby realize the closed-loop control of loud speaker.
Technical solution proposed by the invention is such:
A kind of coil-moving speaker that carries variable area formula capacitor vibration transducer; Comprise ring 1, vibrating diaphragm 2, centring disk 5, basin frame 6, conduction speech coil framework 4, coil 7, conducting magnetic column 8, magnetic conduction upper plate 9, permanent magnet 10, magnetic conduction lower plate 11; Its magnetic structure is external magnetic circuit or internal magnetization magnetic circuit; Coil 7 constitutes voice coil loudspeaker voice coil on conduction speech coil framework 4; Also be provided with Dian Rong ∕ motor message change-over circuit 14; Between said conducting magnetic column 8 and magnetic conduction upper plate 9, be provided with 4 coaxial with said conduction speech coil framework, be used to measure the variable area formula capacitor vibration transducer 24 of voice coil loudspeaker voice coil displacement, the electric capacity variable of these variable area formula capacitor vibration transducer 24 outputs is transported to said Dian Rong ∕ motor message change-over circuit 14 inputs.
Said variable area formula capacitor vibration transducer 24 comprises following multiple structure: said conduction speech coil framework 4 constitutes variable area formula capacitor vibration transducer 24 with conducting magnetic column 8 outer cylinders, and conduction speech coil framework 4 inserts said Dian Rong ∕ motor message change-over circuit 14 inputs through the 1st conductive lead wire 3 and the 2nd conductive lead wire 13 respectively with conducting magnetic column 8 outer cylinders.Conducting magnetic column 8 surfaces are fixed with electrode 16 in the straight-tube shape; Said conduction speech coil framework 4 and the interior electrode 16 formation variable area formula capacitor vibration transducers 24 of straight-tube shape, electrode 16 passes through the 1st conductive lead wire 3 and said Dian Rong ∕ motor message change-over circuit 14 inputs of the 2nd conductive lead wire 13 accesses respectively in conduction speech coil framework 4 and the straight-tube shape.Said conduction speech coil framework 4 constitutes variable area formula capacitor vibration transducer 24 with magnetic conduction upper plate 9 inner cylinder, and conduction speech coil framework 4 inserts said Dian Rong ∕ motor message change-over circuit 14 inputs through the 1st conductive lead wire 3 and the 3rd conductive lead wire 17 respectively with magnetic conduction upper plate 9.
Be provided with its internal diameter straight-tube shape external electrode 18 bigger than voice coil loudspeaker voice coil external diameter in the periphery of said voice coil loudspeaker voice coil; This straight-tube shape external electrode 18 is coaxial with conduction speech coil framework 4; And be fixed on the magnetic conduction upper plate 9; Said conduction speech coil framework 4 constitutes variable area formula capacitor vibration transducer 24 with straight-tube shape external electrode 18, and conduction speech coil framework 4 inserts said Dian Rong ∕ movement conversion circuit 14 inputs through the 1st conductive lead wire 3 and the 3rd conductive lead wire 17 respectively with straight-tube shape external electrode 18.
Be provided with its internal diameter straight-tube shape external electrode 18 bigger than voice coil loudspeaker voice coil external diameter in the periphery of said voice coil loudspeaker voice coil; This straight-tube shape external electrode 18 is coaxial with conduction speech coil framework 4; And be fixed on the magnetic conduction upper plate 9; Said conduction speech coil framework 4, straight-tube shape external electrode 18 and conducting magnetic column 8 outer cylinders constitute variable area formula capacitor vibration transducer 24 jointly, and conduction speech coil framework 4, straight-tube shape external electrode 18 and conducting magnetic column 8 outer cylinders insert said Dian Rong ∕ motor message change-over circuit 14 inputs through the 1st conductive lead wire the 3, the 3rd conductive lead wire 17 and the 2nd conductive lead wire 13 respectively.
Be provided with its internal diameter straight-tube shape external electrode 18 bigger than voice coil loudspeaker voice coil external diameter in the periphery of said voice coil loudspeaker voice coil; This straight-tube shape external electrode 18 is coaxial with conduction speech coil framework 4; And be fixed on the magnetic conduction upper plate 9; Be fixed with electrode 16 in the straight-tube shape on said conducting magnetic column 8 surfaces; Electrode 16 in said conduction speech coil framework 4, the straight-tube shape, straight-tube shape external electrode 18 be common to constitute variable area formula capacitor vibration transducers 24, and electrode 16 and straight-tube shape external electrode 18 insert said Dian Rong ∕ motor message change-over circuit 14 inputs through the 1st conductive lead wire the 3, the 2nd conductive lead wire 13 and the 3rd conductive lead wire 17 respectively in conduction speech coil framework 4, the straight-tube shape.
Said coil 7 outer surfaces are coated with conductive metal foil 19, and this conductive metal foil 19 is wound into inc tubular, and conductive metal foil 19 is electrically connected with conduction speech coil framework 4.
Compared with prior art, the present invention has following remarkable result:
(1) the present invention does to transform quite cleverly to make loud speaker comprise a variable area formula capacitor vibration transducer to common coil-moving speaker structure, thereby realizes the loudspeaker vibration measurement, and employed component structural is simple to be made easily, and cost is low.
(2) because formation capacitor vibration transducer is the variable area formula, thereby have large-scale linear output, satisfied the big dynamic woofer measurement requirement of large amplitude especially.By contrast, the cost paid of the existing method that the adopts velocity coils dimension that is the equal large amplitude of acquisition is huge.
(3) because all parts all are installed in the magnetic circuit of loud speaker, compact conformation receives ectocine little; Can respond the motion of voice coil loudspeaker voice coil rapidly, time-delay is short, and not existing increases the such complicated phase relation of pick-up scheme; Thereby, high-gain and degree of depth negative feedback can be set to correct distortion comprehensively.
(4) the present invention can make the sound system design break away from loud speaker parameter, the isoparametric dependence of tank-volumes, makes design simpler, and can satisfy the demand of product miniaturization.The active servo formula speaker system of utilizing the present invention to construct can significantly reduce the playback lower-frequency limit, improves the fidelity of low-frequency range sound reproduction.
The coil-moving speaker that carries variable area formula capacitor vibration transducer of the present invention is mainly used in the active servo speaker system.The coil-moving speaker that it can be applied to external magnetic circuit also can be applicable to the axial magnetic circuit loud speaker of internal magnetization design and magnetic circuit loudspeaker radially.
Description of drawings
Fig. 1 is a kind of vertical section structure sketch map that carries the coil-moving speaker of variable area formula capacitor vibration transducer of the 1st embodiment of the present invention.
Fig. 2 is the loud speaker vertical section structure sketch map of the 2nd embodiment of the present invention.
Fig. 3 is the loud speaker vertical section structure sketch map of the 3rd embodiment of the present invention.
Fig. 4 is the loud speaker vertical section structure sketch map of the 4th embodiment of the present invention.
Fig. 5 is the loud speaker vertical section structure sketch map of the 5th embodiment of the present invention.
Fig. 6 is the loud speaker vertical section structure sketch map of the 6th embodiment of the present invention.
Fig. 7 is the loud speaker vertical section structure sketch map of the 7th embodiment of the present invention.
Fig. 8 is the loud speaker vertical section structure sketch map of the 8th embodiment of the present invention.
Fig. 9 is the loud speaker vertical section structure sketch map of the 9th embodiment of the present invention.
Figure 10 is the loud speaker vertical section structure sketch map of the 10th embodiment of the present invention.
Figure 11 is the loud speaker vertical section structure sketch map of the 11st embodiment of the present invention.
Figure 12 is the loud speaker vertical section structure sketch map of the 12nd embodiment of the present invention.
Figure 13 is the loud speaker vertical section structure sketch map of the 13rd embodiment of the present invention.
Figure 14 is the loud speaker vertical section structure sketch map of the 14th embodiment of the present invention.
Figure 15 is the loud speaker vertical section structure sketch map of the 15th embodiment of the present invention.
Figure 16 is the voice coil loudspeaker voice coil structural representation that has improved.
Figure 17 adopts the present invention to carry a kind of active servo speaker system block diagram of the coil-moving speaker of variable area formula capacitor vibration transducer.
Figure 18 is the frequency response curve comparison diagram of audio amplifier under servo-drive shown in Figure 17 and the common open loop constant voltage driving mode.The fine rule curve is an open loop constant voltage driving frequency response curve among the figure; Bold line curve is the servo-drive frequency response curve.
Figure 19 is the 30Hz acoustic waveform of audio amplifier output under servo-drive shown in Figure 180 and the common open loop constant voltage driving mode.Dotted line waveform is an open loop constant voltage driving acoustic waveform among the figure; Solid line waveform is the servo-drive acoustic waveform.
Figure 20 is the fft analysis figure that dual mode shown in Figure 19 descends the 30Hz acoustic waveform of output.Dotted line waveform is open loop constant voltage driving acoustic waveform FFT among the figure; Solid line waveform is servo-drive acoustic waveform FFT.
Label declaration among the figure: 1, ring; 2, vibrating diaphragm; 3, the 1st conductive lead wire; 4, conduction speech coil framework; 5, decide core and prop up sheet; 6, basin frame; 7, coil, 8, conducting magnetic column; 9, magnetic conduction upper plate; 10, permanent magnet; 11, magnetic conduction lower plate; 12, magnetic conductor bowl; 13, the 2nd conductive lead wire, 14, electric capacity/motor message change-over circuit; 15, electric capacity/motor message change-over circuit interface; 16, electrode in the straight-tube shape; 17, the 3rd conductive lead wire; 18, straight-tube shape external electrode; 19, conductive metal foil; 20, error amplifier; 21, controller; 22, power amplifier; 23, loud speaker, 24, variable area formula capacitor vibration transducer.
Embodiment
Through following embodiment the present invention is done further to set forth in detail.
Embodiment 1
Referring to shown in Figure 1; A kind of coil-moving speaker that carries variable area formula capacitor vibration transducer is made up of ring 1, vibrating diaphragm 2, centring disk 5, basin frame 6, conduction speech coil framework 4, coil 7, conducting magnetic column 8, magnetic conduction upper plate 9, permanent magnet 10, magnetic conduction lower plate 11, Dian Rong ∕ motor message change-over circuit 14; Between conducting magnetic column 8 and magnetic conduction upper plate 9, be provided with conduct electricity speech coil framework 4 coaxial, be used to measure the variable area formula capacitor vibration transducer 24 of voice coil loudspeaker voice coil displacement, the electric capacity variable of these variable area formula capacitor vibration transducer 24 outputs is transported to Dian Rong ∕ motor message change-over circuit 14 inputs.Described conduction speech coil framework 4 can be coated with the biochip making of conductive layer with sheet metal or surface.Present embodiment is the loud speaker of external magnetic circuit; Conduction speech coil framework 4 constitutes variable area formula capacitor vibration transducer 24 with conducting magnetic column 8 outer cylinders; Conduction speech coil framework 4 inserts Dian Rong ∕ movement conversion circuit 14 inputs through the 1st conductive lead wire 3 and the 2nd conductive lead wire 13 respectively with conducting magnetic column 8 outer cylinders, and Dian Rong ∕ motor message change-over circuit 14 is exported signals and can Tong be crossed Dian Rong ∕ motor message change-over circuit interface 15 and transport in the servo speaker system.Cause short circuit when preventing voice coil loudspeaker voice coil and conducting magnetic column 8 that mechanical frictions take place, conducting magnetic column 8 outer cylinders and voice coil loudspeaker voice coil surface can be covered with insulating barrier.Conducting magnetic column 8 and magnetic conduction lower plate 11 is no matter be electrically connected or electric insulation all can be realized the function of vibration measurement; If can magnetic conduction lower plate 11, magnet 10 and magnetic conduction upper plate 9 be done ground connection processing after both electric insulations are handled; Variable area formula capacitor vibration transducer 24 is in the shielding space, improves its signal to noise ratio.If both are electrically connected then need to consider; The permanent magnet 10 that contacts with magnetic conduction lower plate 11 has certain conductivity; Can introduce interference equally,, can magnetic conduction lower plate 11 and permanent magnet 10 done after the insulation processing magnetic conduction upper plate 9 and permanent magnet 10 to be done ground connection processing for improving signal to noise ratio.
Embodiment 2
Referring to shown in Figure 2, present embodiment is the loud speaker of internal magnetization axial magnetic circuit, and this kind loud speaker is provided with magnetic conductor bowl 12.Except that the magnetic structure difference, all the other are identical with embodiment 1.Generally with inserting insulating barrier in one of them contact-making surface between conducting magnetic column 8, magnetic conduction lower plate 11, permanent magnet 10, the magnetic conductor bowl 12, and magnetic conduction upper plate 9, magnetic conductor bowl 12 done ground connection processing during application, can obtain the highest signal to noise ratio.
Some internal magnetization magnetic circuit loud speakers as if do not have a magnetic conduction upper plate 9; This kind design just constantly is extended to magnetic conduction upper plate 9 endoporus with magnetic conduction upper plate 9 external diameters and overlaps in fact; This moment, magnetic conductor bowl was in the function that the part of magnetic gap has been served as magnetic conduction upper plate 9; Can think to be exactly the described magnetic conduction upper plate 9 of this patent, just be manufactured on magnetic conductor bowl 12.
There are some internal magnetization axial magnetic circuit loudspeaker design not have magnetic conduction lower plate 11; The part that contacts with permanent magnet 10 of conducting magnetic column 8 plays the function of magnetic conduction lower plate 11 in fact; Can think that this part is exactly in the described magnetic conduction lower plate 11 of this patent, just conducting magnetic column 8 has been made with magnetic conduction lower plate 11 and has been done together.
With respect to the loud speaker of internal magnetization axial magnetic circuit, internal magnetization radially magnetic circuit loud speaker permanent magnet 10 or be fixed on the conducting magnetic column outer cylinder 8, or be fixed on magnetic conduction upper plate 9 inner cylinder, or be fixed on magnetic conduction upper plate 9 outer cylinders.For the loud speaker of axial magnetic circuit and unified description of loud speaker of magnetic circuit are radially made following provisions: internal magnetization radially the loud speaker of magnetic circuit if permanent magnet 10 is fixed on the conducting magnetic column 8 and then both is looked as a whole conducting magnetic column 8, if permanent magnet 10 is fixed on the magnetic conduction upper plate 9 and then both is regarded as unified magnetic conduction upper plate 9.
Embodiment 3
Referring to shown in Figure 3; Present embodiment is the loud speaker of external magnetic circuit; Be fixed with electrode 16 in the straight-tube shape at conducting magnetic column 8 outer surfaces; Electrode 16 constitutes variable area formula capacitor vibration transducers 24 in conduction speech coil framework 4 and the straight-tube shape, and conduction speech coil framework 4 inserts Dian Rong ∕ motor message change-over circuits 14 inputs through the 1st conductive lead wire 3 and the 2nd conductive lead wire 13 respectively with the interior electrode 16 of straight-tube shape.In order to obtain enough big linear output amplitude, the axial length of electrode 16 should satisfy the limit, last lower edge that is unlikely to exceed electrode 16 in the straight-tube shape when voice coil loudspeaker voice coil is done the peak swing motion in the straight-tube shape.For the thickness of avoiding electrode 16 in the straight-tube shape increases the probability of wiping circle, for the loud speaker of the isometrical design of conducting magnetic column 8 employings, the thick metal forming manufacturing of 0.02mm to 0.1mm is adopted in electrode 16 suggestions in the straight-tube shape.In order to prevent to cause short circuit when mechanical friction takes place electrode 16 in voice coil loudspeaker voice coil and the straight-tube shape, electrode 16 outer cylinders and voice coil loudspeaker voice coil surface can be covered with insulating barrier in the straight-tube shape.Electrode 16 is electrically connected with conducting magnetic column 8 or electric insulation all can be realized the function of vibration measurement in the straight-tube shape; If electrode 16 then can be done ground connection processing with magnetic conduction lower plate 11, permanent magnet 10, magnetic conduction upper plate 9 and conducting magnetic column 8 with conducting magnetic column 8 insulation in the straight-tube shape, to improve signal to noise ratio; If electrode 16 is electrically connected with conducting magnetic column 8 in the straight-tube shape; Then technology is simple relatively and can enlarge the scope of linear output by the outer surface of conducting magnetic column 8, be to improve signal to noise ratio, magnetic conduction lower plate 11, permanent magnet 10 and magnetic conduction upper plate 9; After making insulation processing with conducting magnetic column 8, can do ground connection processing.
Referring to shown in Figure 4, present embodiment is the loud speaker of internal magnetization axial magnetic circuit, and the longitudinal section of conducting magnetic column 8 is the T font, and electrode 16 is placed in conducting magnetic column 8 path places in the straight-tube shape, and in addition, all the other are identical with embodiment 3.When electrode 16 was placed in conducting magnetic column 8 path places in the straight-tube shape, electrode 16 external diameters were made consistent with conducting magnetic column 8 magnetic gap section diameters in the suggestion.If electrode 16 is placed in conducting magnetic column 8 big footpaths when locating in the straight-tube shape, is to avoid the thickness of electrode 16 in the straight-tube shape to increase the probability of wiping circle, the thick metal forming manufacturing of 0.02mm to 0.1mm is adopted in electrode 16 suggestions in the straight-tube shape.
Embodiment 5
Referring to shown in Figure 5; Present embodiment is external magnetic circuit and is the loud speaker of long magnetic gap short coil design; Conduction speech coil framework 4 constitutes variable area formula capacitor vibration transducer 24 with magnetic conduction upper plate 9 inner cylinder, and it inserts the input of Dian Rong ∕ motor message change-over circuit 14 respectively through the 1st conductive lead wire 3 and the 3rd conductive lead wire 17.Cause short circuit when preventing voice coil loudspeaker voice coil and magnetic conduction upper plate 9 that mechanical frictions take place, magnetic conduction upper plate 9 inner cylinder, voice coil loudspeaker voice coil surface can be covered with insulating barrier.It is also noted that the permanent magnet 10 that contacts with magnetic conduction upper plate 9 has certain conductivity, may introduce interference,, can magnetic conduction upper plate 9 and permanent magnet 10 done after the insulation processing magnetic conduction lower plate 11 and permanent magnet 10 to be done ground connection processing for improving signal to noise ratio.
Embodiment 6
Referring to shown in Figure 6, present embodiment is the internal magnetization axial magnetic circuit and is the loud speaker of long magnetic gap short coil design that in addition, all the other are identical with embodiment 5.Being noted that the magnetic conductor bowl 12 that contacts with magnetic conduction upper plate 9 can disturb in introducing, is to improve signal to noise ratio, can magnetic conduction upper plate 9 and magnetic conductor bowl 12 done after the insulation processing magnetic conductor bowl 12 to be done ground connection processing.
Referring to shown in Figure 7; Present embodiment is external magnetic circuit and is the loud speaker of short magnetic gap long loop design; Be provided with the internal diameter straight-tube shape external electrode 18 bigger than voice coil loudspeaker voice coil external diameter in the periphery of voice coil loudspeaker voice coil; This straight-tube shape external electrode 18 is coaxial with conduction speech coil framework 4; Its upper end is fixed on the lower limb of magnetic conduction upper plate 9 centre bores, and conduction speech coil framework 4 constitutes variable area formula capacitor vibration transducer 24 with straight-tube shape external electrode 18, and conduction speech coil framework 4 and straight-tube shape external electrode 18 insert the input of Dian Rong ∕ motor message change-over circuit 14 respectively through the 1st conductive lead wire 3 and the 3rd conductive lead wire 17.The internal diameter of straight-tube shape external electrode 18 sluggishness more is high more, but the difficulty of considered assembling, because the more little then probability with voice coil loudspeaker voice coil generation mechanical friction of straight-tube shape external electrode 18 internal diameters is big more.Cause short circuit when preventing voice coil loudspeaker voice coil and straight-tube shape external electrode 18 that mechanical frictions take place, straight-tube shape external electrode 18 inner cylinder, voice coil loudspeaker voice coil surface can be covered with insulating barrier.The axial length of straight-tube shape external electrode 18 should satisfy voice coil loudspeaker voice coil and do the peak swing motion and the time be unlikely to exceed the last lower edge of straight-tube shape external electrode 18 and cause distortion.Straight-tube shape external electrode 18 is electrically connected with magnetic conduction upper plate 9 or electric insulation all can be realized the function of vibration measurement, if straight-tube shape external electrode 18 then can be done ground connection processing with magnetic conduction upper plate 9 with 9 insulation of magnetic conduction upper plate, can improve signal to noise ratio; If straight-tube shape external electrode 18 fits tightly and is electrically connected with magnetic conduction upper plate 9; And straight-tube shape external electrode 18 internal diameters are consistent with magnetic conduction upper plate 9 internal diameters; Then can serve as the extension of straight-tube shape external electrode 18 and enlarge the linear scope of exporting by the inner cylinder of magnetic conduction upper plate 9; Even conduction speech coil framework 4 lower edges have exceeded straight-tube shape external electrode 18 upper edges entering magnetic gap and also tangible distortion can not occur in the time of greatly dynamically, but will notice that the permanent magnet 10 that contacts with magnetic conduction upper plate 9 has certain conductivity, may introduce interference; For improving signal to noise ratio, can magnetic conduction upper plate 9 and permanent magnet 10 be done after the insulation processing magnetic conduction lower plate 11 and permanent magnet 10 to be done ground connection processing.
Referring to shown in Figure 8, present embodiment is the internal magnetization axial magnetic circuit and is the loud speaker of short magnetic gap long loop design that in addition, all the other are identical with embodiment 7.If straight-tube shape external electrode 18 is electrically connected with magnetic conduction upper plate 9 and is noted that the magnetic conductor bowl 12 that contacts with magnetic conduction upper plate 9 can disturb in introducing,, can magnetic conduction upper plate 9 and magnetic conductor bowl 12 be done after the insulation processing magnetic conductor bowl 12 to be done ground connection processing for improving signal to noise ratio.
Embodiment 9
Referring to shown in Figure 10, present embodiment is the loud speaker of internal magnetization axial magnetic circuit, and in the present embodiment, the straight-tube shape external electrode 18 that external diameter is matched with magnetic conduction upper plate 9 internal diameters embeds in magnetic conduction upper plate 9 centre bores.For fear of the influence to magnetic gap of the thickness of straight-tube shape external electrode 18, straight-tube shape external electrode 18 can adopt the thick metal forming manufacturing of 0.02mm to 0.1, and the available working of plastics of part or the epoxy resin reinforcing of outstanding magnetic conduction upper plate 9.In addition, all the other are identical with embodiment 7.
Referring to shown in Figure 11; Present embodiment is the loud speaker of external magnetic circuit; Be provided with its internal diameter straight-tube shape external electrode 18 bigger than voice coil loudspeaker voice coil external diameter in the periphery of voice coil loudspeaker voice coil; This straight-tube shape external electrode 18 is coaxial with conduction speech coil framework 4; Its upper end is fixed on the lower limb of magnetic conduction upper plate 9 centre bores, and said conduction speech coil framework 4, conducting magnetic column 8 outer cylinders and straight-tube shape external electrode 18 be common to constitute variable area formula capacitor vibration transducers 24, and conduction speech coil framework 4, conducting magnetic column 8 outer cylinders and straight-tube shape external electrode 18 insert the input of Dian Rong ∕ motor message change-over circuits 14 respectively through the 1st conductive lead wire the 3, the 2nd conductive lead wire 13 and the 3rd conductive lead wire 17.Can conduction speech coil framework 4 ground connection be made screening electrode during application and use, the electric capacity that electric capacity/motor message change-over circuit 14 detects between straight-tube shape external electrode 18 and conducting magnetic column 8 outer cylinders; Also can be with conduction speech coil framework 4 as public electrode, the electric capacity that electric capacity/motor message change-over circuit 14 detects between conduction speech coil framework 4 and straight-tube shape external electrode 18 and conducting magnetic column 8 outer cylinders.The sensitivity of the more little then variable area of the internal diameter of straight-tube shape external electrode 18 formula capacitor vibration transducer 24 is high more, but the difficulty of considered assembling, because the more little then probability with voice coil loudspeaker voice coil generation mechanical friction of straight-tube shape external electrode 18 internal diameters is big more.In order to prevent voice coil loudspeaker voice coil and straight-tube shape external electrode 18, conducting magnetic column 8 to cause short circuit when mechanical friction takes place, conducting magnetic column 8 outer cylinders, straight-tube shape external electrode 18 inner cylinder, voice coil loudspeaker voice coil surface can be covered with insulating barrier.The axial length of straight-tube shape external electrode 18 should satisfy voice coil loudspeaker voice coil and do the peak swing motion and the time be unlikely to exceed the last lower edge of straight-tube shape external electrode 18 and cause distortion.Straight-tube shape external electrode 18 is electrically connected with magnetic conduction upper plate 9 or electric insulation all can be realized the function of vibration measurement, if straight-tube shape external electrode 18 then can be done ground connection processing with magnetic conduction upper plate 9 with 9 insulation of magnetic conduction upper plate, can improve signal to noise ratio; If straight-tube shape external electrode 18 fits tightly and is electrically connected with magnetic conduction upper plate 9; And straight-tube shape external electrode 18 internal diameters are consistent with magnetic conduction upper plate 9 internal diameters; Then can serve as the extension of straight-tube shape external electrode 18 and enlarge the scope of linear output by the inner cylinder of magnetic conduction upper plate 9, though big dynamically the time conduction speech coil framework 4 lower edges exceeded straight-tube shape external electrode 18 upper edges and get into magnetic gap and also tangible distortion can not occur.Should guarantee between conducting magnetic column 8 and the straight-tube shape external electrode 18; And the insulation between the parts of both and other different potentials of circuit; Can between part, make insulation processing in case of necessity; For example, straight-tube shape external electrode 18 to note when being electrically connected with magnetic conduction upper plate 9; Some permanent magnets 10 have certain conductivity, and can cause between straight-tube shape external electrode 18 and the conducting magnetic column 8 to be communicated with through magnetic conduction lower plate 11-permanent magnet 10-magnetic conduction upper plate 9 influences measurement, can in the mutual one or more contact-making surfaces of conducting magnetic column 8, magnetic conduction lower plate 11, permanent magnet 10, magnetic conduction upper plate 9, insert insulating barrier for this reason; For example all insert insulating barrier with magnetic conduction lower plate 11 contact-making surfaces, and can further magnetic conduction lower plate 11 ground connection be increased signal to noise ratio at magnetic conduction upper plate 9 and permanent magnet 10 contact-making surfaces, conducting magnetic column 8.
Referring to shown in Figure 12, present embodiment is the loud speaker of internal magnetization axial magnetic circuit, and in the present embodiment, the straight-tube shape external electrode 18 that external diameter is matched with magnetic conduction upper plate 9 internal diameters embeds in magnetic conduction upper plate 9 centre bores.For the influence to magnetic gap of the thickness that reduces straight-tube shape external electrode 18, straight-tube shape external electrode 18 can adopt the thick metal forming manufacturing of 0.02mm to 0.1mm, the available working of plastics of part or the epoxy resin reinforcing of outstanding magnetic conduction upper plate 9.In addition, all the other are identical with embodiment 11.During application generally with inserting insulating barrier in one of them contact-making surface between conducting magnetic column 8, magnetic conduction lower plate 11, permanent magnet 10, the magnetic conductor bowl 12; Make insulation processing between straight-tube shape external electrode 18 and the magnetic conduction upper plate 9; Magnetic conduction upper plate 9, magnetic conductor bowl 12 are done ground connection processing, can obtain the highest signal to noise ratio.
Embodiment 13
Referring to shown in Figure 13; Present embodiment is the loud speaker of external magnetic circuit; Be provided with its internal diameter straight-tube shape external electrode 18 bigger than voice coil loudspeaker voice coil external diameter in the periphery of voice coil loudspeaker voice coil; This straight-tube shape external electrode 18 is coaxial with conduction speech coil framework 4; Its upper end is fixed on the lower limb of magnetic conduction upper plate 9 centre bores; Be fixed with electrode 16 in the straight-tube shape on conducting magnetic column 8 surfaces, electrode 16 in said conduction speech coil framework 4, the straight-tube shape, straight-tube shape external electrode 18 be common to constitute variable area formula capacitor vibration transducers 24, and electrode 16 and straight-tube shape external electrode 18 insert Dian Rong ∕ motor message change-over circuits 14 inputs through the 1st conductive lead wire the 3, the 2nd conductive lead wire 13 and the 3rd conductive lead wire 17 respectively in conduction speech coil framework 4, the straight-tube shape.During application, can conduction speech coil framework 4 ground connection be made screening electrode and use, electric capacity/motor message change-over circuit 14 detects the electric capacity between the electrode 16 in straight-tube shape external electrode 18 and the straight-tube shape; Also can be with conduction speech coil framework 4 as public electrode, electric capacity/motor message change-over circuit 14 detects the electric capacity between the electrode 16 in conduction speech coil framework 4 and straight-tube shape external electrode 18 and the straight-tube shape.The sensitivity of the more little then variable area of the internal diameter of straight-tube shape external electrode 18 formula capacitor vibration transducer 24 is high more, but the difficulty of considered assembling, because the more little then probability with voice coil loudspeaker voice coil generation mechanical friction of straight-tube shape external electrode 18 internal diameters is big more.In order to prevent to cause short circuit when mechanical friction takes place electrode 16 in voice coil loudspeaker voice coil and straight-tube shape external electrode 18, the straight-tube shape, electrode 16 outer cylinders, voice coil loudspeaker voice coil surface can be covered with insulating barrier in straight-tube shape external electrode 18 inner cylinder, the straight-tube shape.The axial length of the interior electrode 16 of straight-tube shape external electrode 18 and straight-tube shape should satisfy voice coil loudspeaker voice coil and do to be unlikely to when peak swing moves to exceed going up bottom and causing distortion of this two electrode.Electrode 16 is electrically connected or electric insulation with conducting magnetic column 8 in the straight-tube shape; Straight-tube shape external electrode 18 is electrically connected with magnetic conduction upper plate 9 or electric insulation all can be realized the function of vibration measurement; If straight-tube shape external electrode 18 then can be done ground connection processing with magnetic conduction upper plate 9 with 9 insulation of magnetic conduction upper plate, can improve signal to noise ratio; If straight-tube shape external electrode 18 fits tightly and is electrically connected with magnetic conduction upper plate 9; And straight-tube shape external electrode 18 internal diameters are consistent with magnetic conduction upper plate 9 internal diameters; Then can serve as the extension of straight-tube shape external electrode 18 and enlarge the scope of linear output by the inner cylinder of magnetic conduction upper plate 9, though big dynamically the time conduction speech coil framework 4 lower edges exceeded straight-tube shape external electrode 18 upper edges and get into magnetic gap and also tangible distortion can not occur.But should guarantee between interior electrode 16 of straight-tube shape and the straight-tube shape external electrode 18; And the insulation between the parts of both and other different potentials of circuit; Can between part, make insulation processing in case of necessity; For example straight-tube shape external electrode 18 is electrically connected with magnetic conduction upper plate 9 and straight-tube shape in electrode 16 to note when being electrically connected with conducting magnetic column 8; Some permanent magnets 10 have certain conductivity; Can cause in straight-tube shape external electrode 18 and the straight-tube shape between the electrode 16 to be communicated with and influence measurement through conducting magnetic column 8-magnetic conduction lower plate 11-permanent magnet 10-magnetic conduction upper plate 9; Can in conducting magnetic column 8, magnetic conduction lower plate 11, permanent magnet 10, the one or more between any two contact-making surfaces of magnetic conduction upper plate 9, insert insulating barrier for this reason, for example insert insulating barrier with magnetic conduction lower plate 11 contact-making surfaces, and can further magnetic conduction lower plate 11 ground connection be increased signal to noise ratio at magnetic conduction upper plate 9 and permanent magnet 10 contact-making surfaces, conducting magnetic column 8.
Referring to shown in Figure 14, present embodiment is the loud speaker of internal magnetization axial magnetic circuit, and in the present embodiment, the straight-tube shape external electrode 18 that external diameter is matched with magnetic conduction upper plate 9 internal diameters embeds in magnetic conduction upper plate 9 centre bores.For the influence to magnetic gap of the thickness that reduces straight-tube shape external electrode 18, straight-tube shape external electrode 18 can adopt the thick metal forming manufacturing of 0.02mm to 0.1mm, the available working of plastics of part or the epoxy resin reinforcing of outstanding magnetic conduction upper plate 9.In addition, all the other are identical with embodiment 13.During application generally with making insulation processing between electrode in the straight-tube shape 16 and the conducting magnetic column 8; Make insulation processing between straight-tube shape external electrode 18 and the magnetic conduction upper plate 9; Conducting magnetic column 8, magnetic conduction upper plate 9, permanent magnet 10, magnetic conduction lower plate 11, magnetic conductor bowl 12 are done ground connection processing, can obtain the highest signal to noise ratio.
Referring to shown in Figure 15, present embodiment is the radially loud speaker of magnetic circuit of internal magnetization, and all the other are identical with embodiment 14.Make insulation processing between interior electrode 16 of general straight-tube shape and the permanent magnet 10 during application, make insulation processing between straight-tube shape external electrode 18 and the magnetic conduction upper plate 9, conducting magnetic column 8, magnetic conduction upper plate 9, magnetic conductor bowl 12 are done ground connection processing, can obtain the highest signal to noise ratio.
Figure 16 is a kind of voice coil loudspeaker voice coil structural representation that has improved of the present invention, and coil 7 coats with metal forming 19, said conductive metal foil 19 with conduct electricity speech coil framework 4 and be electrically connected.For reducing eddy current loss, metal forming 19 is wound as inc tubular.The effect of metal forming 19 is electric fields of shielded coil, thereby reduces the interference that coil 7 is introduced.
To the active servo speaker system, its circuit box structure is referring to shown in Figure 17 with loudspeaker applications of the present invention.Include the variable area formula capacitor vibration transducer 24 that a capacitance is proportional to the voice coil loudspeaker voice coil displacement in the coil-moving speaker 23 that carries variable area formula capacitor vibration transducer of the present invention, this active servo speaker system by error amplifier 20, controller 21, power amplifier 22, carry the loud speaker 23 of variable area formula capacitor vibration transducer 24 and the Dian Rong ∕ motor message change-over circuit 14 that is contained on the loud speaker 23 is formed.14 pairs of variable area formulas of Dian Rong ∕ motor message change-over circuit capacitor vibration transducer 24 detects; Obtain the motor message of loud speaker 23 voice coil loudspeaker voice coils through conversion of signals; Like acceleration, speed, displacement etc., and the feedback input end of error originated from input amplifier 20 compares the error signal input controller 21 of gained with the outside signal In that imports; The output of this controller 21 connects power amplifier 22 inputs, and power amplifier 22 output drive signals are to loud speaker 23.
In order to verify actual effect of the present invention; Adopt the coil-moving speaker of the variable area formula that the carries capacitor vibration transducer shown in the accompanying drawing 11 to make an active woofer by the system block diagram of present embodiment; Audio amplifier is provided with change over switch, can make speaker operation in servo-drive mode or common open loop constant voltage driving mode.Figure 18 is above-mentioned two kinds of frequency response curves that working method records under same acoustic enviroment.Common open loop constant voltage driving mode is subject to resonance frequency and begins to roll-off with the speed of 16dB/oct from 65Hz, and the frequency of-3db can only go to about 60Hz.And adopt the closed loop servo type of drive, and its frequency response curve is comparatively straight, the frequency of-3db 35Hz that goes directly, and low-frequency minimum is significantly expanded.Under open loop constant voltage driving mode, use equalizer low-frequency range to be done suitably to promote handle equally can the expansion low-frequency lower limit, but the bass distortion that obtains is sizable.Figure 19, Figure 20 will disclose this consequence.Figure 19 is that above-mentioned dual mode is play the sinusoidal wave oscillogram of 30Hz same sound pressure, and the waveform of servo-drive mode is not seen obvious distortion, but the waveform of open loop constant voltage driving mode obviously is out of shape.Figure 20 is the fft analysis figure of these two waveforms, and open loop constant voltage driving mode second harmonic and third harmonic distortion rate are 9%.And adopt servo-drive mode second harmonic aberration rate of the present invention is 0.9%, is 1/10th of open loop constant voltage driving mode, and the triple-frequency harmonics aberration rate is 0.6%, is merely 1/15th of open loop constant voltage driving mode, and it is quite obvious to improve effect.
Claims (8)
1. coil-moving speaker that carries variable area formula capacitor vibration transducer; Comprise ring (1), vibrating diaphragm (2), centring disk (5), basin frame (6), conduction speech coil framework (4), coil (7), conducting magnetic column (8), magnetic conduction upper plate (9), permanent magnet (10), magnetic conduction lower plate (11); Its magnetic structure is external magnetic circuit or internal magnetization magnetic circuit; Coil (7) is gone up around conduction speech coil framework (4) and is constituted voice coil loudspeaker voice coil; Also be provided with Dian Rong ∕ motor message change-over circuit (14); It is characterized in that: between said conducting magnetic column (8) and magnetic conduction upper plate (9), be provided with coaxial with said conduction speech coil framework (4), be used to measure the variable area formula capacitor vibration transducer (24) of voice coil loudspeaker voice coil displacement, the electric capacity variable of this variable area formula capacitor vibration transducer (24) output is transported to said Dian Rong ∕ motor message change-over circuit (14) input.
2. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1; It is characterized in that: said conduction speech coil framework (4) constitutes variable area formula capacitor vibration transducer (24) with conducting magnetic column (8) outer cylinder, and conduction speech coil framework (4) and conducting magnetic column (8) outer cylinder insert said Dian Rong ∕ signaling conversion circuit (14) input through the 1st conductive lead wire (3) and the 2nd conductive lead wire (13) respectively.
3. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1; It is characterized in that: be fixed with electrode in the straight-tube shape (16) on conducting magnetic column (8) surface; Said conduction speech coil framework (4) constitutes variable area formula capacitor vibration transducer (24) with the interior electrode (16) of straight-tube shape, and electrode (16) is respectively through the 1st conductive lead wire (3) and the 2nd conductive lead wire (13) access said Dian Rong ∕ motor message change-over circuit (14) input in conduction speech coil framework (4) and the straight-tube shape.
4. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1; It is characterized in that: said conduction speech coil framework (4) and magnetic conduction upper plate (9) inner cylinder constitute variable area formula capacitor vibration transducer (24), and conduction speech coil framework (4) and magnetic conduction upper plate (9) insert said Dian Rong ∕ motor message change-over circuit (14) input through the 1st conductive lead wire (3) and the 3rd conductive lead wire (17) respectively.
5. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1; It is characterized in that: be provided with its internal diameter straight-tube shape external electrode (18) bigger in the periphery of said voice coil loudspeaker voice coil than voice coil loudspeaker voice coil external diameter; This straight-tube shape external electrode (18) is coaxial with conduction speech coil framework (4); And be fixed on the magnetic conduction upper plate (9); Said conduction speech coil framework (4) constitutes variable area formula capacitor vibration transducer (24) with straight-tube shape external electrode (18), and conduction speech coil framework (4) and straight-tube shape external electrode (18) insert said Dian Rong ∕ movement conversion circuit (14) input through the 1st conductive lead wire (3) and the 3rd conductive lead wire (17) respectively.
6. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1; It is characterized in that: be provided with its internal diameter straight-tube shape external electrode (18) bigger in the periphery of said voice coil loudspeaker voice coil than voice coil loudspeaker voice coil external diameter; This straight-tube shape external electrode (18) is coaxial with conduction speech coil framework (4); And be fixed on the magnetic conduction upper plate (9); Said conduction speech coil framework (4), straight-tube shape external electrode (18) and conducting magnetic column (8) outer cylinder constitute variable area formula capacitor vibration transducer (24) jointly, and conduction speech coil framework (4), straight-tube shape external electrode (18) and conducting magnetic column (8) outer cylinder insert said Dian Rong ∕ motor message change-over circuit (14) input through the 1st conductive lead wire (3), the 3rd conductive lead wire (17) and the 2nd conductive lead wire (13) respectively.
7. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1; It is characterized in that: be provided with its internal diameter straight-tube shape external electrode (18) bigger in the periphery of said voice coil loudspeaker voice coil than voice coil loudspeaker voice coil external diameter; This straight-tube shape external electrode (18) is coaxial with conduction speech coil framework (4); And be fixed on the magnetic conduction upper plate (9); Be fixed with electrode in the straight-tube shape (16) on said conducting magnetic column (8) surface; Electrode (16), straight-tube shape external electrode (18) constitute variable area formula capacitor vibration transducer (24) jointly in said conduction speech coil framework (4), the straight-tube shape, and electrode (16) and straight-tube shape external electrode (18) insert said Dian Rong ∕ motor message change-over circuit (14) input through the 1st conductive lead wire (3), the 2nd conductive lead wire (13) and the 3rd conductive lead wire (17) respectively in conduction speech coil framework (4), the straight-tube shape.
8. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1; It is characterized in that: said coil (7) outer surface is coated with conductive metal foil (19); This conductive metal foil (19) is wound into inc tubular, and conductive metal foil (19) is electrically connected with conduction speech coil framework (4).
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| CN201210291862.5A CN102802104B (en) | 2012-08-16 | 2012-08-16 | Moving-coil loudspeaker with area-alterable capacitive vibration sensor |
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| CN104010263A (en) * | 2013-02-27 | 2014-08-27 | 亚德诺半导体股份有限公司 | Method and detector of loudspeaker diaphragm excursion |
| CN106211000A (en) * | 2016-08-31 | 2016-12-07 | 歌尔股份有限公司 | A kind of coil-moving speaker |
| CN106231513A (en) * | 2016-08-31 | 2016-12-14 | 歌尔股份有限公司 | A kind of coil-moving speaker |
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| TWI596958B (en) * | 2015-12-08 | 2017-08-21 | 富祐鴻科技股份有限公司 | Assembly method for thin mini speaker bracket and slim mini speaker lead |
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