CN102802104B - 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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- CN102802104B CN102802104B CN201210291862.5A CN201210291862A CN102802104B CN 102802104 B CN102802104 B CN 102802104B CN 201210291862 A CN201210291862 A CN 201210291862A CN 102802104 B CN102802104 B CN 102802104B
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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 loudspeaker techniques field, especially relate to a kind of coil-moving speaker that carries variable area formula capacitor vibration transducer.
Background technology
In the playback link in electroacoustic field, the distortion factor of digital sound source and power amplifier all can reach below 0.01% easily.Yet in the loud speaker of sound reproduction link least significant end, the distortion factor is generally all greater than more than 1%, ultralow frequency range reaches more than 5% especially, becomes the neck bottle that 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, by the length relation of voice coil loudspeaker voice coil and magnetic gap, can be further divided into long magnetic gap short coil design and the design of short magnetic gap long loop.Conventionally by forming with lower member: vibrating diaphragm, speech coil framework, coil, basin frame, ring, centring disk, permanent magnet, magnetic conduction upper plate, magnetic conduction lower plate, conducting magnetic column form.For internal magnetization, be also provided with magnetic conductor bowl, coil winding, on speech coil framework, and is positioned to be called in the annular gap of magnetic gap between conducting magnetic column and magnetic conduction upper plate the radial magnetic field that is distributing in 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.After the logical upper signal code of voice coil loudspeaker voice coil, the effect of electromagnetic force will be subject to.Electromagnetic force is delivered to vibrating diaphragm by speech coil framework, and vibrating diaphragm is done forced vibration under the effect of actuating force, drives air to sound.The speech coil framework of coil-moving speaker can be used conductive metal sheet or biochip to reel and form, and in general application, only as mechanical part, uses, and does not emphasize 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, do not emphasize to be equally connected with the signal of circuit.The structure of coil-moving speaker is determining that it can exist following distortion:
(1) distortion being caused by actuating force: be mainly inhomogeneous by magnetic gap Distribution of Magnetic Field, and the non-linear of coil inductance causes.Although adopt symmetrical magnetic circuits can reduce a part of distortion, be limited to cost and other factors, the linear stroke of loud speaker is always limited, for the woofer significantly vibrating, often can greatly dynamically time, exceed the range of linearity and cause distortion.
(2) the non-linear distortion causing of suspension system: due to the restriction of material property, the restoring force of passive ring and centring disk is magnetic hysteresis loop shape with vibrating diaphragm displacement relation, and non-linear relation is particularly evident when particularly 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, vibrational system has certain mass and certain damping, can not follow rapidly fast-changing input signal vibration, always has certain time delay.The loud speaker that forward position rising characteristic is slow, because reaching stable state acoustic pressure overlong time, causes the disappearance of sound head signal; Then, along the poor loud speaker of falling characteristic, after input signal disappearance, vibration damping is poor, causes 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 distortion at last.This distortion is mainly that low-frequency range is because of speaker operation underfrequency because the diaphagras of vibrating diaphragm produces at high band, and working frequency points causes away from oscillating mass controlled area enters 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 expanding 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 can correct the inherent distortion of loud speaker comprehensively, improve the fidelity of whole sound system.Loudspeaker feedback signal acquisition behavior has following methods at present:
(1) Chinese patent communique discloses the speaker unit that publication number is CN1377566A: near loud speaker, install pick-up additional, pick up the voice signal that loud speaker sends, be converted to the feedback end that then signal of telecommunication feeds back to power amplifier.There is following shortcoming in the method: voice signal sends from loud speaker will be through arriving pick-up after a while, and the feedback of signal exists longer time lag, and phase relation is complicated, and it is dark that feedback generally can not Jia get Tai, otherwise easily cause the concussion of system.Therefore the improvement of negative feedback sound reproduction effect not obvious.Meanwhile, also there is distortion in pickup process, and the microphone price of low distortion is higher.In addition, extraneous sound noise is easy to be incorporated in system by pick-up, has reduced the signal to noise ratio of system.
(2) Chinese patent communique discloses the moving feedback type loudspeaker that publication number is CN85204257U: it is on common coil-moving speaker basis, increase velocity coils, velocity coils output voltage is proportional to loudspeaker voice coil vibration velocity, and feedback signal feeds back to amplifier in after single order differential.An extra magnetic circuit and the coil of increasing of the method, complex structure manufacturability is poor, and the magnetic circuit that tests the speed exists phenomenon pockety equally, causes distortion.
(3) Chinese patent communique discloses the low distortion loudspeaker vibration negative feedback system assembly that publication number is CN2319986y: it detects the displacement of vibrating diaphragm with reflective photoelectric sensor.The method be can predict and the cone angle as the vibrating diaphragm of reflecting surface, the impact of diaphragm materials reflection characteristic are easy to be subject to, in embodiment, used ON2152 as described transducer, in the specification of ON2152, listed the Ic-D figure of blank sheet of paper 90% reflection with mirror-reflection, can confirm the impact that it is subject to 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, there is large-scale linear output, meet especially the large dynamic woofer of large amplitude and measured requirement, the output of this transducer just can obtain the motor message of loudspeaker voice coil by the detection of electric capacity/motor message change-over circuit, as feedback signal, be input to the feedback input end of motion servo formula amplifier, 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 magnetic type magnetic circuit, coil 7 forms voice coil loudspeaker voice coil on conduction speech coil framework 4, also be provided with electricity Rong ∕ motor message change-over circuit 14, between described conducting magnetic column 8 and magnetic conduction upper plate 9, be provided with described conduction speech coil framework 4 coaxial, for measuring 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 described electricity Rong ∕ motor message change-over circuit 14 inputs.
Described variable area formula capacitor vibration transducer 24 comprises various structures below: described conduction speech coil framework 4 forms variable area formula capacitor vibration transducer 24 with conducting magnetic column 8 outer cylinders, and conduction speech coil framework 4 and conducting magnetic column 8 outer cylinders are respectively by the 1st conductive lead wire 3 and the described electricity Rong ∕ motor message change-over circuit of the 2nd conductive lead wire 13 access 14 inputs.Conducting magnetic column 8 surfaces are fixed with electrode 16 in straight-tube shape, described conduction speech coil framework 4 forms variable area formula capacitor vibration transducers 24 with the interior electrode 16 of straight-tube shape, and in conduction speech coil framework 4 and straight-tube shape, electrode 16 accesses described electricity Rong ∕ motor message change-over circuit 14 inputs by the 1st conductive lead wire 3 and the 2nd conductive lead wire 13 respectively.Described conduction speech coil framework 4 and magnetic conduction upper plate 9 inner cylinder form variable area formula capacitor vibration transducer 24, and conduction speech coil framework 4 and magnetic conduction upper plate 9 are respectively by the 1st conductive lead wire 3 and the described electricity Rong ∕ motor message change-over circuit of the 3rd conductive lead wire 17 access 14 inputs.
At described voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode 18 that its internal diameter is larger 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 magnetic conduction upper plate 9, described conduction speech coil framework 4 forms 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 are respectively by the 1st conductive lead wire 3 and the described electricity Rong ∕ motion change-over circuit of the 3rd conductive lead wire 17 access 14 inputs.
At described voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode 18 that its internal diameter is larger 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 magnetic conduction upper plate 9, described conduction speech coil framework 4, straight-tube shape external electrode 18 and conducting magnetic column 8 outer cylinders form 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 are respectively by the 1st conductive lead wire the 3, the 3rd conductive lead wire 17 and the described electricity Rong ∕ motor message change-over circuit of the 2nd conductive lead wire 13 access 14 inputs.
At described voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode 18 that its internal diameter is larger 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 magnetic conduction upper plate 9, on described conducting magnetic column 8 surfaces, be fixed with electrode 16 in straight-tube shape, described conduction speech coil framework 4, electrode 16 in straight-tube shape, the common formation variable area of straight-tube shape external electrode 18 formula capacitor vibration transducer 24, conduction speech coil framework 4, in straight-tube shape, electrode 16 and straight-tube shape external electrode 18 are respectively by the 1st conductive lead wire 3, the 2nd conductive lead wire 13 and the described electricity Rong ∕ motor message change-over circuit of the 3rd conductive lead wire 17 access 14 inputs.
Described 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 to conduction speech coil framework 4.
Compared with prior art, the present invention has following remarkable result:
(1) the present invention does to transform and can make loud speaker comprise a variable area formula capacitor vibration transducer quite cleverly to common coil-moving speaker structure, thereby realize loudspeaker vibration, measures, simple easy manufacture of component structural of using, and cost is low.
(2) owing to forming capacitor vibration transducer, be variable area formula, thereby there is large-scale linear output, met especially the large dynamic woofer of large amplitude and measure requirement.By contrast, the method for existing employing velocity coils is that the cost that the dimension of the equal large amplitude of acquisition is paid is huge.
(3) because all parts are all installed in the magnetic circuit of loud speaker, compact conformation, is subject to ectocine little, can respond rapidly the motion of voice coil loudspeaker voice coil, time delay is short, does not exist and increases the phase relation that pick-up scheme is complicated like that, thereby, high-gain and deep negative can be set and feed back and correct distortion comprehensively.
(4) the present invention can make sound system design break away from loudspeaker parameters, the isoparametric dependence of tank-volumes, makes design simpler, and can meet the demand of product miniaturization.Utilize the active servo formula speaker system that the present invention constructs can significantly reduce playback lower-frequency limit, improve 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 active servo speaker system.The coil-moving speaker that it can be applied to external magnetic circuit also can be applicable to axial magnetic circuit loud speaker and the radial magnetic circuit loudspeaker that internal magnetization designs.
Accompanying drawing explanation
Fig. 1 is a kind of vertical section structure schematic diagram 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 schematic diagram of the 2nd embodiment of the present invention.
Fig. 3 is the loud speaker vertical section structure schematic diagram of the 3rd embodiment of the present invention.
Fig. 4 is the loud speaker vertical section structure schematic diagram of the 4th embodiment of the present invention.
Fig. 5 is the loud speaker vertical section structure schematic diagram of the 5th embodiment of the present invention.
Fig. 6 is the loud speaker vertical section structure schematic diagram of the 6th embodiment of the present invention.
Fig. 7 is the loud speaker vertical section structure schematic diagram of the 7th embodiment of the present invention.
Fig. 8 is the loud speaker vertical section structure schematic diagram of the 8th embodiment of the present invention.
Fig. 9 is the loud speaker vertical section structure schematic diagram of the 9th embodiment of the present invention.
Figure 10 is the loud speaker vertical section structure schematic diagram of the 10th embodiment of the present invention.
Figure 11 is the loud speaker vertical section structure schematic diagram of the 11st embodiment of the present invention.
Figure 12 is the loud speaker vertical section structure schematic diagram of the 12nd embodiment of the present invention.
Figure 13 is the loud speaker vertical section structure schematic diagram of the 13rd embodiment of the present invention.
Figure 14 is the loud speaker vertical section structure schematic diagram of the 14th embodiment of the present invention.
Figure 15 is the loud speaker vertical section structure schematic diagram of the 15th embodiment of the present invention.
Figure 16 is the voice coil loudspeaker voice coil structural representation having 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 common open loop constant voltage type of drive.In figure, fine rule curve is that open loop constant voltage drives frequency response curve; Bold line curve is servo-drive frequency response curve.
Figure 19 is the 30Hz acoustic waveform of audio amplifier output under servo-drive shown in Figure 18 and common open loop constant voltage type of drive.In figure, dotted line waveform is that open loop constant voltage drives acoustic waveform; Solid line waveform is servo-drive acoustic waveform.
Figure 20 is the fft analysis figure of the 30Hz acoustic waveform exported under two kinds of modes shown in Figure 19.In figure, dotted line waveform is that open loop constant voltage drives acoustic waveform FFT; Solid line waveform is servo-drive acoustic waveform FFT.
Number in the figure explanation: 1, ring; 2, vibrating diaphragm; 3, the 1st conductive lead wire; 4, conduction speech coil framework; 5, determine 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 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
By embodiment below, the present invention is further elaborated.
Embodiment 1
Shown in Figure 1, a kind of coil-moving speaker that carries variable area formula capacitor vibration transducer is by 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, electricity Rong ∕ motor message change-over circuit 14 forms, between conducting magnetic column 8 and magnetic conduction upper plate 9, be provided with to conduct electricity speech coil framework 4 coaxial, for measuring 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 electricity Rong ∕ motor message change-over circuit 14 inputs.Described conduction speech coil framework 4 can be coated with sheet metal or surface the biochip making of conductive layer.The present embodiment is the loud speaker of external magnetic circuit, conduction speech coil framework 4 and conducting magnetic column 8 outer cylinders form variable area formula capacitor vibration transducer 24, conduction speech coil framework 4 and conducting magnetic column 8 outer cylinders are respectively by the 1st conductive lead wire 3 and the 2nd conductive lead wire 13 access electricity Rong ∕ motion change-over circuit 14 inputs, and electricity Rong ∕ motor message change-over circuit 14 output signals can Tong be crossed electricity Rong ∕ motor message change-over circuit interface 15 and transported in servo speaker system.Cause short circuit when preventing voice coil loudspeaker voice coil and conducting magnetic column 8 that mechanical friction occurs, 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 to or electric insulation all can be realized the function of vibration measurement, if both electric insulations can be made grounding by magnetic conduction lower plate 11, magnet 10 and magnetic conduction upper plate 9 after processing, make variable area formula capacitor vibration transducer 24 in a shielding space, improve its signal to noise ratio.If both,, for being electrically connected to, need to consider, the permanent magnet 10 contacting with magnetic conduction lower plate 11 has certain conductivity, can introduce interference equally, for improving signal to noise ratio, magnetic conduction lower plate 11 and permanent magnet 10 can be done, after insulation processing, magnetic conduction upper plate 9 and permanent magnet 10 are made to grounding.
Embodiment 2
Shown in Figure 2, the present embodiment is the loud speaker of internal magnetization axial magnetic circuit, and this kind of loud speaker is provided with magnetic conductor bowl 12.Except magnetic structure difference, all the other are identical with embodiment 1.During application, generally will in one of them contact-making surface between conducting magnetic column 8, magnetic conduction lower plate 11, permanent magnet 10, magnetic conductor bowl 12, insert insulating barrier, and magnetic conduction upper plate 9, magnetic conductor bowl 12 are made to grounding, can obtain the highest signal to noise ratio.
The seeming of some internal magnetic type magnetic circuit loud speakers do not have magnetic conduction upper plate 9, this kind of design is just constantly extended to magnetic conduction upper plate 9 endoporus with magnetic conduction upper plate 9 external diameters and overlaps in fact, now magnetic conductor bowl has served as the function of magnetic conduction upper plate 9 in the part of magnetic gap, can think to be exactly the magnetic conduction upper plate 9 described in this patent, just be manufactured in together with magnetic conductor bowl 12.
There are some internal magnetization axial magnetic circuit loudspeaker design there is no magnetic conduction lower plate 11, the part that conducting magnetic column 8 contacts with permanent magnet 10 in fact plays the function of magnetic conduction lower plate 11, can think that this part is exactly in the magnetic conduction lower plate 11 described in this patent, just conducting magnetic column 8 and magnetic conduction lower plate 11 have been manufactured together with doing.
With respect to the loud speaker of internal magnetization axial magnetic circuit, the loud speaker permanent magnet 10 of internal magnetization radial magnetic circuit or be fixed on conducting magnetic column outer cylinder 8, or be fixed in magnetic conduction upper plate 9 inner cylinder, or be fixed on magnetic conduction upper plate 9 outer cylinders.For unified description of the loud speaker of the loud speaker of axial magnetic circuit and radial magnetic circuit made to following provisions: both are looked to as a whole conducting magnetic column 8 on conducting magnetic column 8 if the loud speaker permanent magnet 10 of internal magnetization radial magnetic circuit is fixed on, both are considered as to unified magnetic conduction upper plate 9 on magnetic conduction upper plate 9 if permanent magnet 10 is fixed on.
Embodiment 3
Shown in Figure 3, the present embodiment is the loud speaker of external magnetic circuit, at conducting magnetic column 8 outer surfaces, be fixed with electrode 16 in straight-tube shape, conduction speech coil framework 4 forms variable area formula capacitor vibration transducers 24 with the interior electrode 16 of straight-tube shape, and in conduction speech coil framework 4 and straight-tube shape, electrode 16 accesses electricity Rong ∕ motor message change-over circuit 14 inputs by the 1st conductive lead wire 3 and the 2nd conductive lead wire 13 respectively.In order to obtain enough large linear output amplitude, in straight-tube shape the axial length of electrode 16 should meet when voice coil loudspeaker voice coil is done peak swing motion, be unlikely to exceed electrode 16 in straight-tube shape up and down along limit.For avoiding the thickness of electrode 16 in straight-tube shape to increase the probability of wiping circle, for conducting magnetic column 8, adopt the loud speaker of isometrical design, in straight-tube shape, electrode 16 suggestions adopt the thick metal forming manufacture of 0.02mm to 0.1mm.Cause short circuit when preventing in voice coil loudspeaker voice coil and straight-tube shape electrode 16 that mechanical friction occurs, in straight-tube shape, electrode 16 outer cylinders and voice coil loudspeaker voice coil surface can be covered with insulating barrier.The interior electrode 16 of straight-tube shape is electrically connected to conducting magnetic column 8 or electric insulation all can be realized the function of vibration measurement, if in straight-tube shape, electrode 16 can be made grounding by magnetic conduction lower plate 11, permanent magnet 10, magnetic conduction upper plate 9 and conducting magnetic column 8 with conducting magnetic column 8 insulation, to improve signal to noise ratio; If electrode 16 is electrically connected to conducting magnetic column 8 in straight-tube shape, technique is relatively simple and can by the outer surface of conducting magnetic column 8, expand the scope of linear output, be to improve signal to noise ratio, magnetic conduction lower plate 11, permanent magnet 10 and magnetic conduction upper plate 9, do after insulation processing with conducting magnetic column 8, can make grounding.
Embodiment 4
Shown in Figure 4, the present embodiment is the loud speaker of internal magnetization axial magnetic circuit, and the longitudinal section of conducting magnetic column 8 is T font, and in straight-tube shape, electrode 16 is placed on conducting magnetic column 8 path places, and in addition, all the other are identical with embodiment 3.When in straight-tube shape, electrode 16 is placed on conducting magnetic column 8 path place, in suggestion, electrode 16 external diameters are made consistent with conducting magnetic column 8 magnetic gap section diameters.When if in straight-tube shape, electrode 16 is placed on place, the large footpath of conducting magnetic column 8, for avoiding the thickness of electrode 16 in straight-tube shape to increase the probability of wiping circle, in straight-tube shape, electrode 16 suggestions adopt the thick metal forming manufacture of 0.02mm to 0.1mm.
Embodiment 5
Shown in Figure 5, the present embodiment is external magnetic circuit and is the loud speaker of long magnetic gap short coil design, conduction speech coil framework 4 forms variable area formula capacitor vibration transducer 24 with magnetic conduction upper plate 9 inner cylinder, and it is respectively by the input of the 1st conductive lead wire 3 and the 3rd conductive lead wire 17 access electricity Rong ∕ motor message change-over circuits 14.Cause short circuit when preventing voice coil loudspeaker voice coil and magnetic conduction upper plate 9 that mechanical friction occurs, 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 contacting with magnetic conduction upper plate 9 has certain conductivity, may introduce interference, for improving signal to noise ratio, magnetic conduction upper plate 9 and permanent magnet 10 can be done, after insulation processing, magnetic conduction lower plate 11 and permanent magnet 10 are made to grounding.
Embodiment 6
Shown in Figure 6, the present embodiment is internal magnetization axial magnetic circuit and is the loud speaker of long magnetic gap short coil design, and in addition, all the other are identical with embodiment 5.Being noted that the magnetic conductor bowl 12 contacting with magnetic conduction upper plate 9 can disturb in introducing, is to improve signal to noise ratio, magnetic conduction upper plate 9 and magnetic conductor bowl 12 can be done, after insulation processing, magnetic conductor bowl 12 is made to grounding.
Embodiment 7
Shown in Figure 7, the present embodiment is external magnetic circuit and is the loud speaker of short magnetic gap long loop design, at voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode 18 that internal diameter is larger than voice coil loudspeaker voice coil external diameter, 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, conduction speech coil framework 4 forms variable area formula capacitor vibration transducer 24 with straight-tube shape external electrode 18, conduction speech coil framework 4 and straight-tube shape external electrode 18 are respectively by the input of the 1st conductive lead wire 3 and the 3rd conductive lead wire 17 access electricity Rong ∕ motor message change-over circuits 14.The internal diameter of straight-tube shape external electrode 18 more sluggishness is higher, but should consider the difficulty of assembling, because straight-tube shape external electrode 18 internal diameters are less larger with the probability of voice coil loudspeaker voice coil generation mechanical friction.Cause short circuit when preventing voice coil loudspeaker voice coil and straight-tube shape external electrode 18 that mechanical friction occurs, 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 meet voice coil loudspeaker voice coil and do peak swing when motion and be unlikely to exceed the upper lower edge of straight-tube shape external electrode 18 and cause distortion.Straight-tube shape external electrode 18 is electrically connected to magnetic conduction upper plate 9 or electric insulation all can be realized the function of vibration measurement, if straight-tube shape external electrode 18 can be made grounding by 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 to magnetic conduction upper plate 9, and straight-tube shape external electrode 18 internal diameters are consistent with magnetic conduction upper plate 9 internal diameters, can serve as the extension of straight-tube shape external electrode 18 and expand the linear scope of exporting by the inner cylinder of magnetic conduction upper plate 9, even large, conducting electricity speech coil framework 4 lower edges dynamically time has exceeded straight-tube shape external electrode 18 upper edges and enters magnetic gap and also there will not be obvious distortion, but notice that the permanent magnet 10 contacting with magnetic conduction upper plate 9 has certain conductivity, may introduce interference, for improving signal to noise ratio, magnetic conduction upper plate 9 and permanent magnet 10 can be done, after insulation processing, magnetic conduction lower plate 11 and permanent magnet 10 are made to grounding.
Embodiment 8
Shown in Figure 8, the present embodiment is internal magnetization axial magnetic circuit and is the loud speaker of short magnetic gap long loop design, and in addition, all the other are identical with embodiment 7.If straight-tube shape external electrode 18 is electrically connected to and is noted that the magnetic conductor bowl 12 contacting with magnetic conduction upper plate 9 can disturb in introducing with magnetic conduction upper plate 9, is to improve signal to noise ratio, magnetic conduction upper plate 9 and magnetic conductor bowl 12 can be done, after insulation processing, magnetic conductor bowl 12 is made to grounding.
Embodiment 9
Embodiment 8 is the loud speaker of short magnetic gap long loop design, and the loud speaker designing for long magnetic gap short coil can also improve by increasing straight-tube shape external electrode 18 range of linearity of variable area formula capacitor vibration transducer 24 outputs.Shown in Figure 9, with respect to embodiment 6, now can improve the range of linearity of lower edge.Straight-tube shape external electrode 18 shown in Fig. 9 should fit tightly and be electrically connected to magnetic conduction upper plate 9.
Embodiment 10
Shown in Figure 10, the 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.Impact for fear of the thickness of straight-tube shape external electrode 18 on magnetic gap, straight-tube shape external electrode 18 can adopt the metal forming manufacture that 0.02mm to 0.1 is thick, 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.
Embodiment 11
Shown in Figure 11, the present embodiment is the loud speaker of external magnetic circuit, at voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode 18 that its internal diameter is larger than voice coil loudspeaker voice coil external diameter, 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, described conduction speech coil framework 4, conducting magnetic column 8 outer cylinders and the common formation variable area of straight-tube shape external electrode 18 formula capacitor vibration transducer 24, conduction speech coil framework 4, conducting magnetic column 8 outer cylinders and straight-tube shape external electrode 18 are respectively by the 1st conductive lead wire 3, the input of the 2nd conductive lead wire 13 and the 3rd conductive lead wire 17 access electricity Rong ∕ motor message change-over circuits 14.During application, conduction speech coil framework 4 ground connection can be made to screening electrode 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 using 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 less variable area of the internal diameter formula capacitor vibration transducer 24 of straight-tube shape external electrode 18 is higher, but should consider the difficulty of assembling, because straight-tube shape external electrode 18 internal diameters are less larger with the probability of voice coil loudspeaker voice coil generation mechanical friction.In order to prevent voice coil loudspeaker voice coil and straight-tube shape external electrode 18, conducting magnetic column 8 to cause short circuit while there is mechanical friction, 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 meet voice coil loudspeaker voice coil and do peak swing when motion and be unlikely to exceed the upper lower edge of straight-tube shape external electrode 18 and cause distortion.Straight-tube shape external electrode 18 is electrically connected to magnetic conduction upper plate 9 or electric insulation all can be realized the function of vibration measurement, if straight-tube shape external electrode 18 can be made grounding by 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 to magnetic conduction upper plate 9, and straight-tube shape external electrode 18 internal diameters are consistent with magnetic conduction upper plate 9 internal diameters, can serve as the extension of straight-tube shape external electrode 18 and expand the scope of linear output by the inner cylinder of magnetic conduction upper plate 9, even large, conduct electricity speech coil framework 4 lower edges dynamically time and exceeded straight-tube shape external electrode 18 upper edges and enter magnetic gap and also there will not be obvious distortion.Should guarantee between conducting magnetic column 8 and 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 if desired, for example when being electrically connected to magnetic conduction upper plate 9, straight-tube shape external electrode 18 to note, some permanent magnets 10 have certain conductivity, can cause between straight-tube shape external electrode 18 and conducting magnetic column 8 and be communicated with and affect measurement by magnetic conduction lower plate 11-permanent magnet 10-magnetic conduction upper plate 9, for this reason can be at conducting magnetic column 8, magnetic conduction lower plate 11, permanent magnet 10, in the mutual one or more contact-making surfaces of magnetic conduction upper plate 9, insert insulating barrier, for example, at magnetic conduction upper plate 9 and permanent magnet 10 contact-making surfaces, conducting magnetic column 8 is all inserted insulating barrier with magnetic conduction lower plate 11 contact-making surfaces, and can further magnetic conduction lower plate 11 ground connection be increased to signal to noise ratio.
Embodiment 12
Shown in Figure 12, the 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.In order to reduce the impact of the thickness of straight-tube shape external electrode 18 on magnetic gap, straight-tube shape external electrode 18 can adopt the metal forming manufacture that 0.02mm to 0.1mm is thick, 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 will in one of them contact-making surface between conducting magnetic column 8, magnetic conduction lower plate 11, permanent magnet 10, magnetic conductor bowl 12, insert insulating barrier, between straight-tube shape external electrode 18 and magnetic conduction upper plate 9, make insulation processing, magnetic conduction upper plate 9, magnetic conductor bowl 12 are made grounding, can obtain the highest signal to noise ratio.
Embodiment 13
Shown in Figure 13, the present embodiment is the loud speaker of external magnetic circuit, at voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode 18 that its internal diameter is larger than voice coil loudspeaker voice coil external diameter, 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, on conducting magnetic column 8 surfaces, be fixed with electrode 16 in straight-tube shape, described conduction speech coil framework 4, electrode 16 in straight-tube shape, the common formation variable area of straight-tube shape external electrode 18 formula capacitor vibration transducer 24, conduction speech coil framework 4, in straight-tube shape, electrode 16 and straight-tube shape external electrode 18 are respectively by the 1st conductive lead wire 3, the 2nd conductive lead wire 13 and the 3rd conductive lead wire 17 access electricity Rong ∕ motor message change-over circuit 14 inputs.During application, conduction speech coil framework 4 ground connection can be made to screening electrode and use, electric capacity/motor message change-over circuit 14 detects the electric capacity between electrode 16 in straight-tube shape external electrode 18 and straight-tube shape; Also can be using conduction speech coil framework 4 as public electrode, electric capacity/motor message change-over circuit 14 detects the electric capacity between electrode 16 in conduction speech coil framework 4 and straight-tube shape external electrode 18 and straight-tube shape.The sensitivity of the less variable area of the internal diameter formula capacitor vibration transducer 24 of straight-tube shape external electrode 18 is higher, but should consider the difficulty of assembling, because straight-tube shape external electrode 18 internal diameters are less larger with the probability of voice coil loudspeaker voice coil generation mechanical friction.Cause short circuit when preventing in voice coil loudspeaker voice coil and straight-tube shape external electrode 18, straight-tube shape electrode 16 that mechanical friction occurs, in straight-tube shape external electrode 18 inner cylinder, straight-tube shape, electrode 16 outer cylinders, voice coil loudspeaker voice coil surface can be covered with insulating barrier.The axial length of electrode 16 should meet be unlikely to exceed this two electrode when voice coil loudspeaker voice coil is done peak swing motion upper and causes below distortion in straight-tube shape external electrode 18 and straight-tube shape.In straight-tube shape, electrode 16 is electrically connected to or electric insulation with conducting magnetic column 8, straight-tube shape external electrode 18 is electrically connected to magnetic conduction upper plate 9 or electric insulation all can be realized the function of vibration measurement, if straight-tube shape external electrode 18 can be made grounding by 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 to magnetic conduction upper plate 9, and straight-tube shape external electrode 18 internal diameters are consistent with magnetic conduction upper plate 9 internal diameters, can serve as the extension of straight-tube shape external electrode 18 and expand the scope of linear output by the inner cylinder of magnetic conduction upper plate 9, even large, conduct electricity speech coil framework 4 lower edges dynamically time and exceeded straight-tube shape external electrode 18 upper edges and enter magnetic gap and also there will not be obvious distortion.But should guarantee between the interior electrode 16 of straight-tube shape and 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 if desired, for example, when straight-tube shape external electrode 18 is electrically connected to magnetic conduction upper plate 9 and the interior electrode 16 of straight-tube shape is electrically connected to conducting magnetic column 8, to note, some permanent magnets 10 have certain conductivity, can cause between the interior electrode 16 of straight-tube shape external electrode 18 and straight-tube shape and be communicated with and affect measurement by conducting magnetic column 8-magnetic conduction lower plate 11-permanent magnet 10-magnetic conduction upper plate 9, for this reason can be at conducting magnetic column 8, magnetic conduction lower plate 11, permanent magnet 10, magnetic conduction upper plate 9 is inserted insulating barrier in one or more contact-making surfaces between any two, for example, at magnetic conduction upper plate 9 and permanent magnet 10 contact-making surfaces, conducting magnetic column 8 is inserted insulating barrier with magnetic conduction lower plate 11 contact-making surfaces, and can further magnetic conduction lower plate 11 ground connection be increased to signal to noise ratio.
Embodiment 14
Shown in Figure 14, the 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.In order to reduce the impact of the thickness of straight-tube shape external electrode 18 on magnetic gap, straight-tube shape external electrode 18 can adopt the metal forming manufacture that 0.02mm to 0.1mm is thick, 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 will between electrode in straight-tube shape 16 and conducting magnetic column 8, make insulation processing, between straight-tube shape external electrode 18 and magnetic conduction upper plate 9, make insulation processing, conducting magnetic column 8, magnetic conduction upper plate 9, permanent magnet 10, magnetic conduction lower plate 11, magnetic conductor bowl 12 are made grounding, can obtain the highest signal to noise ratio.
Embodiment 15
Shown in Figure 15, the present embodiment is the loud speaker of internal magnetization radial magnetic circuit, and all the other are identical with embodiment 14.During application, between the interior electrode 16 of general straight-tube shape and permanent magnet 10, make insulation processing, between straight-tube shape external electrode 18 and magnetic conduction upper plate 9, make insulation processing, conducting magnetic column 8, magnetic conduction upper plate 9, magnetic conductor bowl 12 are made grounding, can obtain the highest signal to noise ratio.
Embodiment 16
The voice coil loudspeaker voice coil structural representation that Figure 16 is a modification of the present invention, coil 7 is coated with metal forming 19, described conductive metal foil 19 with conduct electricity speech coil framework 4 and be electrically connected to.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.
Embodiment 17
By loudspeaker applications of the present invention, to active servo speaker system, its circuit box structure is shown in Figure 17.In the coil-moving speaker 23 that carries variable area formula capacitor vibration transducer of the present invention, include the variable area formula capacitor vibration transducer 24 that a capacitance is proportional to voice coil loudspeaker voice coil displacement, 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 electricity Rong ∕ motor message change-over circuit 14 that is contained on loud speaker 23 forms.14 pairs of variable area formula capacitor vibration transducers 24 of electricity Rong ∕ motor message change-over circuit detect, through signal, be converted to the motor message of loud speaker 23 voice coil loudspeaker voice coils, as acceleration, speed, displacement etc., and the feedback input end of error originated from input amplifier 20 and the outside signal In comparison of inputting, the error signal input control device 21 of gained, 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 accompanying drawing 11 to make an active woofer by the system block diagram of the present embodiment, audio amplifier is provided with change over switch, can make speaker operation in servo-drive mode or common open loop constant voltage type of drive.Figure 18 is above-mentioned two kinds of frequency response curves that working method records under same acoustic enviroment.Common open loop constant voltage type of drive is limited to resonance frequency and starts to roll-off with the speed of 16dB/oct from 65Hz, and the frequency of-3db can only go to 60Hz left and right.And adopt closed loop servo type of drive, and its frequency response curve is comparatively straight, the through 35Hz of frequency of-3db, and low-frequency minimum is significantly expanded.Under open loop constant voltage type of drive, use equalizer low-frequency range to be done suitably to promote process equally can expansion low-frequency lower limit, but the bass distortion obtaining is sizable.Figure 19, Figure 20 will disclose this consequence.Figure 19 is the oscillogram that two kinds of above-mentioned modes are play 30Hz same sound pressure sine wave, and the waveform of servo-drive mode has no obvious distortion, but the waveform of open loop constant voltage type of drive is obviously out of shape.Figure 20 is the fft analysis figure of these two waveforms, and open loop constant voltage type of drive second harmonic and third harmonic distortion rate are 9%.And adopt servo-drive mode second harmonic aberration rate of the present invention, being 0.9%, is 1/10th of open loop constant voltage type of drive, and triple-frequency harmonics aberration rate is 0.6%, only, for 1/15th of open loop constant voltage type of drive, improves effect quite obvious.
Claims (8)
1. a 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 magnetic type magnetic circuit, coil (7) is around the upper formation of conduction speech coil framework (4) voice coil loudspeaker voice coil, also be provided with electricity Rong ∕ motor message change-over circuit (14), it is characterized in that: between described conducting magnetic column (8) and magnetic conduction upper plate (9), be provided with described conduction speech coil framework (4) coaxial, for measuring 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 described electricity 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: described conduction speech coil framework (4) forms 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 access described electricity Rong ∕ motor message change-over circuit (14) input by 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: on conducting magnetic column (8) surface, be fixed with electrode in straight-tube shape (16), described conduction speech coil framework (4) forms variable area formula capacitor vibration transducer (24) with the interior electrode (16) of straight-tube shape, and in conduction speech coil framework (4) and straight-tube shape, electrode (16) accesses described electricity Rong ∕ motor message change-over circuit (14) input by the 1st conductive lead wire (3) and the 2nd conductive lead wire (13) respectively.
4. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1, it is characterized in that: described conduction speech coil framework (4) and magnetic conduction upper plate (9) inner cylinder form variable area formula capacitor vibration transducer (24), conduction speech coil framework (4) and magnetic conduction upper plate (9) access described electricity Rong ∕ motor message change-over circuit (14) input by 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: at described voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode (18) that its internal diameter is larger 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 magnetic conduction upper plate (9), described conduction speech coil framework (4) forms variable area formula capacitor vibration transducer (24) with straight-tube shape external electrode (18), conduction speech coil framework (4) and straight-tube shape external electrode (18) access described electricity Rong ∕ motor message change-over circuit (14) input by 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: at described voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode (18) that its internal diameter is larger 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 magnetic conduction upper plate (9), described conduction speech coil framework (4), straight-tube shape external electrode (18) and conducting magnetic column (8) outer cylinder form variable area formula capacitor vibration transducer (24) jointly, conduction speech coil framework (4), straight-tube shape external electrode (18) and conducting magnetic column (8) outer cylinder are respectively by the 1st conductive lead wire (3), the 3rd conductive lead wire (17) and the 2nd conductive lead wire (13) access described electricity Rong ∕ motor message change-over circuit (14) input.
7. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1, it is characterized in that: at described voice coil loudspeaker voice coil outer, be arranged with the straight-tube shape external electrode (18) that its internal diameter is larger 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 magnetic conduction upper plate (9), on described conducting magnetic column (8) surface, be fixed with electrode in straight-tube shape (16), described conduction speech coil framework (4), electrode (16) in straight-tube shape, straight-tube shape external electrode (18) forms variable area formula capacitor vibration transducer (24) jointly, conduction speech coil framework (4), in straight-tube shape, electrode (16) and straight-tube shape external electrode (18) are respectively by the 1st conductive lead wire (3), the 2nd conductive lead wire (13) and the 3rd conductive lead wire (17) access described electricity Rong ∕ motor message change-over circuit (14) input.
8. the coil-moving speaker that carries variable area formula capacitor vibration transducer according to claim 1, it is characterized in that: described 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 to 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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| 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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| US10219090B2 (en) | 2013-02-27 | 2019-02-26 | Analog Devices Global | Method and detector of loudspeaker diaphragm excursion |
| CN109362007B (en) * | 2013-04-01 | 2020-12-08 | 日本先锋公司 | Loudspeaker device |
| CN106231513A (en) * | 2016-08-31 | 2016-12-14 | 歌尔股份有限公司 | A kind of coil-moving speaker |
| CN106211000A (en) * | 2016-08-31 | 2016-12-07 | 歌尔股份有限公司 | A kind of coil-moving speaker |
| CN111669695B (en) * | 2020-07-17 | 2022-01-04 | 维沃移动通信有限公司 | Loudspeaker amplitude detection method and electronic equipment |
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| US4256923A (en) * | 1979-08-17 | 1981-03-17 | Meyers Stanley T | Sound reproducing system utilizing motional feedback and integrated magnetic structure |
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