CN101026901A - Double-coil dual magnetic gap transducer - Google Patents
Double-coil dual magnetic gap transducer Download PDFInfo
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- CN101026901A CN101026901A CN 200610020317 CN200610020317A CN101026901A CN 101026901 A CN101026901 A CN 101026901A CN 200610020317 CN200610020317 CN 200610020317 CN 200610020317 A CN200610020317 A CN 200610020317A CN 101026901 A CN101026901 A CN 101026901A
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Abstract
Upper and lower polar plates being as circular plates grip one block or more isopachic uniformly distributed Nd-Fe-B magnet inside. Two annular magnetic gaps are formed between vertical perimeter face of axial hole and cirumferential face of cylindrical magnetic body. It is stated that upper and lower polar plates of permanent magnet possess even symmetric surface field intensity or equal number of magnetic line, and large enough volume, and magnetic energy product; magnetic flux density inside annular magnetic gaps reaches to saturation state; the transducer possesses left/right and up/down two sets of magnetic circuit symmetrical in geometry and magnetic performance, and two sets of symmetrical coil circuit. Wrapping direction of two sets of coil and direction of current make coils generate electric motive force in same direction. The two sets of coil possess equal quantity of inductance and number of turns. The transducer possesses load characteristic of resistance.
Description
Technical field
The present invention relates to electromechanical transducer, particularly have the transducer with resistance load characteristics of two coaxial isometrical magnetic gaps and two coaxial isometrical coils, belong to the electromechanical transducer field of electricity.
Background technology
In the prior art, the inventor's ZL00122197.3 and PCT/CN00/00241 international monopoly provide a kind of have resistance load characteristics, high sensitivity, high fidelity, small size, ventilation and heat good, have long stroke and ultra-long-stroke, on the permanent magnet pole-face, do not re-use the double-coil double-magnet gap transducer of binding agent, its weak point is: to as how the X-X axle money of permanent magnet 1/2nd axial heights be horizontal symmetry axis, obtain that this key technology of laterally zygomorphic two groups of symmetrical magnetic circuits lacks distinct solution aspect magnetic property.Simultaneously, be necessary to be that vertical axis of symmetry is made further qualification to the left-right symmetric of two groups of magnetic circuits and two groups of coil circuits to the up-down symmetry of two groups of coil circuits and with the central axis of described transducer top crown, bottom crown central authorities axis hole aspect physical dimension and the electrical property.In addition, for the transducer of some short stroke and moderate stroke, magnetic structures such as the top crown of foregoing invention patent and bottom crown also can obtain simplifying.
In the prior art, traditional panel speaker equivalence is an inductive load, so form great upper punch at the high band of frequency electrical response curve, makes the obvious deterioration of high pitch frequency range electroacoustic reduction quality of panel speaker.In addition, large-area classic flat-plate loud speaker all adopts a plurality of drivers to promote plane phonation board vibration sounding, because there are certain difference in equivalent inductance or equivalent capacity between a plurality of drivers that use on the same plane phonation board, in the time of such Multipoint Drive panel speaker work, will produce the asynchronous operating mode that the out of phase difference causes between each driver and the audio signal input current, make the fidelity deterioration of panel speaker.In addition, the classic flat-plate loud speaker adopts the internal magnetization moving coil driver, limit by voice coil diameter, and the physical dimension of neodium magnet can not be done very greatly, and the electronic thrust that is produced is lower, and this also is a key factor that causes panel speaker sensitivity on the low side.
Summary of the invention
The objective of the invention is to overcome the weak point of prior art, providing some kinds, to have a resistance load characteristics, high fidelity, high sensitivity, small size, ventilation and heat good, can adapt to various demands such as short stroke, moderate stroke, long stroke and ultra-long-stroke, with simple technical scheme be formed in about the magnetic property aspect, about symmetrical two groups of magnetic circuits and the electrical property aspect, symmetrical two groups of coil circuits, make the frequency impedance and the frequency pressure response curve of two magnetic gap two-coil transducers more become straight, magnetic structure is further simplified.
Another object of the present invention is the weak point that overcomes prior art, provide have resistance load characteristics, strong driving power single-point or Multipoint Drive panel speaker that the neodium magnet volume is not subjected to voice coil diameter restriction, make panel speaker be converted into the resistor-type load by the inductive type load, promote the sensitivity and the fidelity of panel speaker significantly, make the low-frequency minimum of panel speaker produce great dive.
The object of the present invention is achieved like this:
A kind of double-coil double-magnet gap transducer, comprise magnetic circuit and link all-in-one-piece carriage or framework with it with permanent magnet, two coaxial isometrical annular magnetic gaps and a coil rack that inserts magnetic gap, wound in parallel electric wire insulated from each other and constitute two coils on it, the taper shape or the ball that link together with coil rack and elastic damping plate push up shape or planar shaped vibrating diaphragm or plane phonation board, piston motion by coil rack drives described vibrating diaphragm or phonation board vibration sounding, perhaps detect the sound pressure variations of sound and in coil, sense corresponding audio signal by described vibrating diaphragm
The top crown of described magnetic circuit and bottom crown are circular flat boards that is provided with central axis hole, perhaps described top crown and bottom crown are the circular flat boards of a concave shaped that is provided with two different-diameter central authorities axis holes, be provided with the rare-earth permanent magnet of axial charging between described top crown and the bottom crown, the N utmost point of described permanent magnet and S utmost point pole-face have symmetrically surface electric field intensity or equal magnetic figure, having enough big volume and magnetic energy product makes the interior magnetic flux density of described annular magnetic gap reach an annular ndfeb magnet or a fan-shaped or disc or the ring piece shape ndfeb magnet that above uniform thickness is uniform of the sharp state of satiety
Constitute two coaxial isometrical annular magnetic gaps between the vertical side face of central axis hole with the outer peripheral face of described top crown and the coaxial mounted cylinder shape magnetic of bottom crown and described top crown and bottom crown, go into coaxial mounted two coils in described annular magnetic gap interpolation, two coils of regulation around to and the sense of current of flowing through coil, make described coil produce unidirectional electric power F in same work moment
Central axis with described top crown and bottom crown axis hole is a vertical axis of symmetry, bisector X-X axis with described permanent magnet 1/2nd axial heights is a horizontal symmetry axis, described double-coil double-magnet gap transducer has about aspect geometry and the magnetic property, laterally zygomorphic two groups of magnetic circuits and about aspect geometry and the electrical property, laterally zygomorphic two groups of coil circuits, stipulate two described coils after being connected in series around to just opposite, the wire cross-section of two described coils is long-pending, the number of turn and inductance value absolute value are equal to each other, described double-coil double-magnet gap transducer is a transducer with resistance load characteristics
The carriage that non-magnetic conduction rigid material is made be bonded on the outer side plane of described bottom crown and by the securing member that one group of non-magnetic conduction rigid material is made described cylinder shape magnetic, bottom crown, permanent magnet and top crown are connected to as a whole,
Perhaps, described top crown, permanent magnet, bottom crown are embedded into the uncovered cylinder inwall that is installed in the framework that a non-magnetic conduction rigid material makes and the convex column by the framework axis part connects to described cylinder shape magnetic and described bottom crown, permanent magnet, top crown as a whole.
Described permanent magnet is one group of ring piece shape ndfeb magnet that uniform thickness is uniform, be provided with on described top crown and bottom crown and the corresponding through hole of described permanent magnet axis hole, the tight part that one group of non-magnetic conduction rigid material is made inserts the axis hole of each described through hole of described top crown, bottom crown and described permanent magnet and they is connected to as a whole.
The annular coupling piece bonding that the top of described coil rack and non-magnetic conduction rigid material are made is fixing, the outside horizontal plane bonding of a described plane phonation board and described annular coupling piece is fixing, a described elastic damping plate is bearing on the outer side plane of described top crown and with itself and described coil rack bonding to be fixed, and constitutes a flat electroacoustic transducer of superpower power with double-coil double-magnet gap thus.
The carriage that non-magnetic conduction rigid material is made, its central part is provided with an axis hole, the outside of described axis hole is provided with an annular inner concave platform face, the outside of described annular inner concave platform face be provided with one with the corresponding annular groove of described annular magnetic gap, the bottom land of described annular groove is provided with convection current pore uniform more than three, the outside of described annular groove is provided with coaxial and the fixing loop bracket mounting plane of the outer side plane bonding of described bottom crown, the securing member that cylinder shape magnetic is made by one group of non-magnet material is bonded and fixed on the described annular inner concave platform face of described carriage, constitute two coaxial isometrical annular magnetic gaps between the vertical side face of the outer peripheral face of described cylinder shape magnetic and described top crown and bottom crown central authorities axis hole, constitute the described symmetrical magnetic circuits of a described transducer thus.Described carriage is made by engineering plastics or aluminium alloy.
The framework that non-magnetic conduction rigid material is made, the waist of described framework is provided with a coaxial uncovered cylinder, described uncovered cylinder the tube end inner side plane be provided with one with the corresponding annular groove of described annular magnetic gap, the bottom land of described annular groove is provided with convection current pore uniform more than three, the inboard of described annular groove and the outside are respectively equipped with two coaxial annular flat table tops, the axis part of that annular flat table top placed in the middle is provided with the convex column that a non-magnetic conduction rigid material is made, described cylinder shape magnetic is sleeved on the described convex column, and with described top crown, permanent magnet, bottom crown embeds and is installed in the uncovered cylinder of described framework, constitute two coaxial isometrical annular magnetic gaps between the vertical side face of the outer peripheral face of described cylinder shape magnetic and described top crown and bottom crown central authorities axis hole, constitute the described symmetrical magnetic circuits of a described transducer thus.Described framework is made by engineering plastics or aluminium alloy.
Also be provided with one on described carriage that cooperates with the outer side plane of described bottom crown or the described framework described non-magnetic conduction rigid material securing member evagination partly embedded toroidal cavity in it.
The top crown of described magnetic circuit and bottom crown are the circular flat boards of concave shaped that is provided with two central axis holes, the bore of another axis hole of relative aperture of one of them axis hole is little, little that axis hole of bore is near the outside horizontal plane of described top crown and bottom crown, and its vertical side face constitutes two coaxial isometrical described annular magnetic gaps with the outer peripheral face of described cylinder shape magnetic.
Description of drawings
Fig. 1 shows the transducer driver sectional arrangement drawing of the embodiment of the invention 1.
Fig. 2 shows the loud speaker sectional arrangement drawing of the embodiment of the invention 2.
Fig. 3 shows the panel speaker sectional arrangement drawing of the embodiment of the invention 3.
Fig. 4 shows the magnetic circuit A-A flat sectional drawing of the embodiment of the invention 4.
Fig. 5 shows the magnetic circuit A-A flat sectional drawing of the embodiment of the invention 5.
Fig. 6 shows the magnetic circuit partial longitudinal section of the embodiment of the invention 5.
Fig. 7 shows the present invention's annular magnetic gap and permanent magnet magnetic energy product and the corresponding BH curve figure of volume.
Fig. 8 shows the circular dull and stereotyped sectional arrangement drawing of concave shaped of the embodiment of the invention 6.
Main element of the present invention and label corresponding relation are as follows:
Top crown/bottom crown---103,203,303,403,503 (A/B);
Outer side plane/the bottom crown of top crown outer side plane---10300,20300,30300,40300,50300 (A/B);
Pole-face---100,200,300,400,500;
Framework---101,201,301,401,501;
Uncovered cylinder---1871,2871,3871,4871,5871;
Recessed position mating surface----133,233,333,433,533;
Permanent magnet---102,202,302,402,502;
Heat loss through convection air flue----117,217,317,417,517;
Cavity----163,263,363,463,563;
Vibrating diaphragm (flat)----106,206,306,406,506 to phonation board;
Elasticity is hanged limit----199,299,399,499 599;
Elastic damping plate----141,241,341,441,541;
Dust cap----105,205,305,405,505;
Coil rack----107,207,307,407,507;
Coil----109,209,309,409,509;
Annular bearing surface----108,208,308,408,508;
Annular bearing surface----142,242,342,442,542;
Annular groove----135,235,335,435,535;
Annular groove----139,239,339,439,539;
Annular magnetic gap----110,210,310,410,510;
Inner concave platform face----111,211,311,411,511;
Convex column----112,212,312,412,512;
Convex column mating annular face----11200,21200,31200,41200,51200;
The cylinder shape magnetic---113,213,313,413,513;
Carriage---187,287,387,487,587;
Carriage inner concave platform face----1118,2118,3118,4118,5118;
Carriage mounting plane----1800,2800,3800,4800,5800;
The convection current pore---182,282,382,482,582;
Non-magnetic conduction securing member----1000,2000,3000,4000,5000;
Non-magnetic conduction securing member----1900,2900,3900,4900,5900;
Non-magnetic conduction screw----180,280,380,480,580;
Non-magnetic conduction screw----189,289,389,489,589;
Non-magnetic conduction nut----1894,2894,3894,4894,5894;
Non-magnetic conduction nut----183,283,383,483,583;
Non-magnetic conduction packing ring---184,284,384,484,584;
Non-magnetic conduction packing ring---1890,2890,3890,4890,5890;
The annular coupling piece---179,279,379,479,579;
Binding agent-----001
Embodiment
The present invention is further elaborated below with reference to accompanying drawing.
Fig. 2 shows the loud speaker sectional arrangement drawing of the embodiment of the invention 2.
The framework 201 that adopts non-magnetic conduction rigid materials such as aluminium alloy or engineering plastics to make, its waist is provided with a uncovered cylinder 1871, the diameter of its internal diameter and top crown 203A and bottom crown 203B is complementary, the bottom axis part of uncovered cylinder 1871 is provided with a convex column 212 coaxial with central axis, the outside of convex column 212 is provided with a coaxial annular inner concave platform face 211, the outside of inner concave platform face 211 is provided with a coaxial annular groove 235, and the outside of annular groove 235 extends to the inwall vertical plane of uncovered cylinder 1871 and constitutes an annular mounting plane 20300B who is complementary with the outer side plane of bottom crown 203B.On bottom crown mounting plane 20300B, be coated with binding agent 001 in advance, the top crown 203A that will bond together then, permanent magnet 202 and bottom crown 203B embed and are installed in the described uncovered cylinder, regulating it keeps coaxial with convex column 212 and at top crown 203A, permanent magnet 202, forming a width between the vertical outer peripheral face of bottom crown 203B and the inwall vertical plane of uncovered cylinder 1871 is the recessed position mating surface 233 of millimeter level dimension, and the binding agent 001 that is coated on outer side plane 20300B of bottom crown 203B and the recessed position mating surface 233 is bonded and fixed at outer core of described magnetic circuit and framework on the vertical axis of symmetry.
The cylinder shape magnetic 213 that good permeability magnetic material is made has wall thickness symmetrically and is complementary with the height of the outer core of above-mentioned magnetic circuit, and its internal diameter is slightly larger than the external diameter of convex column 212 and constitutes the convex column mating annular face 21200 (do not mark) of a width for millimeter level dimension thus.On the inner concave platform face 211 of the medial surface of cylinder shape magnetic 213 and framework 201, be coated with binding agent 001 in advance, then it is sleeved on the convex column 212 and keeps coaxial with the vertical symmetry axis, all component level faces and mounting plane and vertical symmetry axis intersect vertically.Constitute two described coaxial isometrical annular magnetic gap 210A and 210B between the vertical side face of axis hole of the outer peripheral face of cylinder shape magnetic 213 and top crown 203A, bottom crown 203B.
Permanent magnet 202 is the uniform annular ndfeb magnets of a bulk matter, and the polarity behind the axial charging as shown in this figure.Be horizontal symmetry axis and be vertical axis of symmetry with the bisector X-X axis of permanent magnet 1/202nd 2 axial height, constitute about the geometry thus, symmetrical two groups of symmetrical magnetic circuits with described central axis.Left side magnetic circuit with Fig. 2 loud speaker central axial line is an example: the permanent-magnet line constitutes closed magnetic circuit via the element 202N utmost point → 203A → 210A → 209A → 210A → 213 → 210B → 209B → 210B → 203B → 202S utmost point.This shows that the permanent-magnet line passes through the coil 209A in the magnetic gap from left to right among the last magnetic gap 210A, the permanent-magnet line passes through coil 209B in the magnetic gap by the right side among the following magnetic gap 210B, and the magnetic line of force direction in two magnetic gaps just differs 180 degree phase angles up and down.Therefore, look fashionable from the vibrating diaphragm direction, as long as two coil 209A of regulation and 209B around on the contrary, for example coil 209A for clockwise around to coil 209B be the inhour around to, Lorentz force principle according to electricity, as the same work moment that above-mentioned two coils are connected tone currents, the electric power F that coil 209A produces
AElectric power F with coil 209B generation
BDirection identical, the electric power F=F of loudspeaker coil
A+ F
BWhen tone currents is anti-phase, electric power F
A, F
BDirection also opposite, this moment loud speaker electric power F=F
A+ F
BEquation remain unchanged, the direction of the F that just makes a concerted effort is opposite.
A cylindric coil rack 207, two of parallel winded are connected in series on it coil 209A and 209B, the spacing of coil and the height of coil and described annular magnetic gap are complementary.An elastic damping plate 241 and a conical diaphragm 206 bond together with coil rack 207, and the outstanding limit 299 of the elasticity of vibrating diaphragm 206 is bonded in respectively on the annular bearing surface 242 and annular bearing surface 208 of framework 201 with elastic damping plate 241.The degree of depth of annular groove 210 provides enough following row spaces for the coil rack 207 of loud speaker, and at this moment, the width of annular groove 235 should be complementary with annular magnetic gap 210A210B, and its degree of depth then is complementary with the axial stroke of coil rack 207.As seen from Figure 2, form a narrow and small cavity 263 between dust cap 205, annular magnetic gap 210 and the annular groove 235, in order to make the unlikely piston motion of air in the cavity 263 produce harmful air damping, must convection current pore 282 uniform more than three be set on the annular groove 235 to coil.In addition, when vibrating diaphragm 206 and elastic damping plate 241 were done the piston motion, the heat that convection current pore 282 can also produce coil in the course of the work emitted in time, has satisfied the ventilation and heat requirement of coil simultaneously.
By as seen above-mentioned, the simplest mode of connection of present embodiment coil circuit is that coil 209A is connected with coil 209B reverse parallel connection, at this moment, the equivalent inductance of loud speaker reduces by 1/2nd because of coils from parallel connection of coils work, and its frequency impedance response curve is compared with traditional unicoil loud speaker and obtained tangible improvement.
The preferred forms of present embodiment: stipulate that two coil 209A that are connected in series and coil 209B have long-pending, equal coil turn n of equal wire cross-section and equal winding inductance quantity absolute value L=|209A|=|209B|, therefore, two described coils have equal axial height.Control effectively these two coils and described axis hole center line coaxial precision and with the symmetrical up and down precision of annular magnetic gap, the bisector X-X axis that we just can obtain with described permanent magnet 1/2nd axial heights be horizontal symmetry axis, with the central axis of top crown and bottom crown axis hole be vertical axis of symmetry, about aspect geometry and the electrical property, symmetrical two groups of coil circuits.About aspect two groups of geometries and the magnetic property, under the coupling of symmetrical symmetrical magnetic circuits, the inductance value of coil 209A and coil 209B is cancelled out each other because having 180 degree phase angles in the course of the work, and the present embodiment loud speaker is a kind of double-coil double-magnet gap transducer that has resistance load characteristics or be similar to resistance load characteristics.
Because top crown 203A, bottom crown 203B, permanent magnet 202, cylinder shape magnetic 213, all there is a form and position tolerance in the process and assemble process of annular magnetic gap 210A and 210B, particularly be difficult to the control top crown, the thickness of two layer binders is equal fully between bottom crown and the permanent magnet, therefore, the present invention is providing a new technical scheme again on the basis of former patent of invention ZL00122197.3: must in the manufacturing of permanent magnet and the process that magnetizes, guarantee the N utmost point pole-face of permanent magnet 202 and S utmost point pole-face have symmetrically surface electric field intensity or equal magnetic figure, make permanent magnet 202 have enough big volume and magnetic energy product BH, allow the interior magnetic induction density B of annular magnetic gap 210A and 210B reach hypersaturated state.For example, for a certain image point in the annular magnetic gap 210, when the adhesive thickness of top crown 203A and permanent magnet 202 increased to δ 2 by δ 1, because the volume and the magnetic energy product of permanent magnet are enough big, its energy that provides was enough to guarantee that the magnetic induction density B of this point still is in saturation condition.Concrete condition sees also shown in Figure 7, (magnetic flux density/magnetic field intensity) that flex point 1 shows this image point in the not described annular magnetic gap state that reached capacity, and put 2 and put 3 and all be in hypersaturated state: when the volume of permanent magnet and magnetic energy product put 1 when increasing once again, though the magnetic field intensity H of X-axis obtains growth by a relatively large margin, but Dui Ying Y-axis magnetic flux density is little as can to ignore because of the changing value increment that BH curve has entered horizontal line section (as putting 2) or B value with it, shown in the phantom line segments point 3 that Fig. 7 BH curve upwarps slightly.Like this, we " though waste " little by little ndfeb magnet or excessive magnetic energy product BH value, form and position tolerance and adhesive thickness do not wait the transducer technology performance degradation problem that causes in the transducer magnetic circuit process and assemble process but can very solve simply thus, make loud speaker obtain about, symmetrical two groups of symmetrical magnetic circuits and two groups of symmetric coil circuit, the frequency impedance of transducer and frequency pressure response curve (especially 15～20KHz high pitch frequency range) more become straight.
Fig. 1 shows the transducer driver sectional arrangement drawing of the embodiment of the invention 1.
Different with embodiment illustrated in fig. 22 is: the carriage 187 that adopts non-magnetic conduction rigid materials such as engineering plastics or aluminium alloy to make, and its axis part is provided with an axis hole, and the axis of axis hole constitutes the central axis of transducer magnetic circuit, coil circuit and vibrational system.The outside of axis hole is provided with a coaxial annular carriage inner concave platform face 1118, the external diameter of its external diameter and described cylinder shape magnetic 113 is complementary, the outside of carriage inner concave platform face 1118 is provided with a coaxial annular groove 135, the shaft hole diameter of its external diameter and top crown 103A and bottom crown 103B is complementary, its internal diameter and cylinder shape magnetic 113 are complementary, the outside of annular groove 135 is provided with a coaxial annular carriage mounting plane 1800, the diameter of its external diameter and bottom crown 103B is complementary, and the shaft hole diameter of its internal diameter and bottom crown 103B is complementary.
The cylinder shape magnetic 113 that good permeability magnetic material is made, have wall thickness symmetrically and be complementary with the height of the outer core of described magnetic circuit, 184, non-magnetic conduction screws 180 of a non-magnetic conduction packing ring are installed in the upper surface of cylinder shape magnetic 113 to be passed non-magnetic conduction packing ring 184 and cylinder shape magnetic 113 and the lower surface of cylinder shape magnetic 113 fixedly is bonded in the axis part of inner concave platform face 1118 of carriage 187 by non-magnetic conduction nut 183 and binding agent 001 and coaxial with central axis.On carriage mounting plane 1800, be coated with binding agent 001 in advance, the outer core of the described magnetic circuit that has bonded together is bonded and fixed on the carriage mounting plane 1800, regulating outer core of magnetic circuit and cylinder shape magnetic 113 makes with central axis coaxial, make the X---X axis of itself and permanent magnet keep essential symmetrical up and down precision simultaneously, two coaxial isometrical annular magnetic gap 110A and 110B of formation transducer between the vertical side face of axis hole of the outer peripheral face of cylinder shape magnetic 113 and top crown 103A, bottom crown 103B.
As seen from Figure 1, the transducer framework that vibrational systems such as vibrating diaphragm 106, elastic damping plate 141, the outstanding limit 199 of elasticity and speech coil framework 107 are installed omits in the present embodiment not to be painted, and it can use binding agent to be bonded and fixed on the outer side plane 10300A of top crown 103A.Vibrating diaphragm and supporting clamping plate directly can certainly be fixed on top crown outside flat surface 10300
AOn, the sound diaphragm of loudspeaker risen by for example traditional ball and supporting framework is such.
Except above-mentioned points, the description of the structure of present embodiment, operation principle and Fig. 2 is identical and no longer repeat, for further details, please refer to respective element that specification lists with the label corresponding relation and combine Fig. 1, Fig. 2 is set forth.
Fig. 3 shows the panel speaker sectional arrangement drawing of the embodiment of the invention 3.
Different with framework 201 shown in Figure 2, the framework 301 shown in the embodiment 3 is a kind ofly to have only uncovered cylinder 3871 and do not have a kind of framework scheme of outward extending taper basin.As seen from the figure, the outer core (top crown 303A, hydromagnetic iron 302, bottom crown 303B) of described magnetic circuit just imbeds uncovered cylinder 3871, and outer side plane 30300A is just concordant with the upper end of uncovered cylinder 3871 for its top crown.Cylinder shape magnetic 313 is sleeved on the convex column 312 of framework 301.A speech coil framework 307 inserts annular magnetic gap 310A and 310B, for example traditional round annular coupling piece 379 bondings made of engineering plastics are fixing for the top of speech coil framework 307 and non-magnetic conduction rigid material, elastic damping plate 341 bondings are positioned on the outer side plane 30300A of top crown, and its another bearing-surface and speech coil framework 307 bondings are fixing.A plane phonation board is fixing with the outer side plane bonding of annular coupling piece 379 as vibrating diaphragm 379, constitutes a kind of panel speaker with resistance load characteristics thus.Except above-mentioned points, the description of the structure of present embodiment 3, operation principle and Fig. 2 is identical and no longer repeat, details please refer to respective element that specification lists with the label corresponding relation and combine Fig. 3, Fig. 2 is set forth.
Because this panel speaker has adopted external magnetic type structure, the volume of Nd-Fe-B permanent magnet 302 is not subjected to the restriction of voice coil diameter, so the driver element of superpower power can be provided for panel speaker, promote the sensitivity S PL of panel speaker significantly, the low frequency end dive that makes panel speaker is to about the 60Hz.Secondly, according to execution mode shown in Figure 3, we can also install 2～6 even more driver element on same plane phonation board, constitute a kind of large flat loud speaker (omit and do not paint) of Multipoint Drive thus.
As everyone knows, the large flat loud speaker of traditional Multipoint Drive adopts 2～6 even more internal magnetization driver element, and this driver has two blocks of magnet, a magnetic gap and a voice coil loudspeaker voice coil.Limit by voice coil diameter, the volume of ndfeb magnet can not be done very greatly, and therefore, the driving power that provides is very limited.Secondly, the classic flat-plate loud speaker has the inductive load characteristic.Be installed in 2～6 internal magnetization legacy drive on the same plane phonation board, obtain different equivalent inductances or equiva lent impedance because of the discreteness of processing, assembling process, thereby in the input tone currents, also can produce different phase place retardations (or phase difference) between the electric power F that each driver produces, this also is a higher reason of traditional large flat loudspeaker distortions degree.
If use the mode shown in the present embodiment to make panel speaker be converted into the resistor-type load characteristic by the inductive type load characteristic, each driver on same plane phonation board, make the electric power and input tone currents signal Synchronization or basic synchronization of each driver because having resistance load characteristics, the fidelity of panel speaker and electroacoustic reduction quality can be significantly improved.
Fig. 4 shows the magnetic circuit A-A flat sectional drawing of the embodiment of the invention 4.
Still with Fig. 2 and be illustrated as reference example, embodiment 4 adopts the uniform disc ndfeb magnet of 8 uniform thickness of axial chargings to replace a disc ndfeb magnet shown in Figure 1.They bonded dose 001 be bonded and fixed between top crown 403A and the bottom crown 403B.On the inner concave platform face 4118 of carriage 487, owing to be subjected to the influence of A-A view, Fig. 4 only shows non-magnetic conduction screw 480 to cylinder shape magnetic 413 by one group of non-magnetic conduction securing member 4000 installing and locating.Between two adjacent disc Nd-Fe-B permanent magnets 402, leave suitable heat loss through convection air flue 417, except above-mentioned points, the description of the structure of present embodiment, operation principle and Fig. 2, Fig. 1 is identical and no longer repeat, and for further details, please refer to respective element that specification lists and label corresponding relation and combines Fig. 2 and Fig. 1 is set forth.
Fig. 5 shows the magnetic circuit A-A flat sectional drawing of the embodiment of the invention 5.
Embodiment 4 adopts the uniform ring piece shape ndfeb magnet of 8 uniform thickness of axial charging to replace an annular ndfeb magnet shown in Figure 1.Be provided with 8 uniform and 8 corresponding through holes of ring piece shape ndfeb magnet axis hole at the corresponding position of top crown 503A and bottom crown 503B, be provided with 5900,8 groups of such securing members of one group of non-magnetic conduction securing member in each through hole with top crown 503A, permanent magnet 502 and the outer core of a described magnetic circuit of bottom crown 503B binding becoming.As seen from Figure 5, cylinder shape magnetic 513 is sleeved on the convex column 512 of described framework 501.Between two adjacent ring piece shape Nd-Fe-B permanent magnets 402, leave suitable heat loss through convection air flue 517, except above-mentioned points, the description of the structure of present embodiment, operation principle and Fig. 2 is identical and no longer repeat, and for further details, please refer to respective element that specification lists and label corresponding relation and combines Fig. 2 and Fig. 4 is set forth.
Fig. 6 shows the magnetic circuit partial longitudinal section of the embodiment of the invention 5.
This is the sectional arrangement drawing of elements such as one group of non-magnetic conduction securing member and top crown in the embodiment of the invention 5, permanent magnet, bottom crown.Permanent magnet 502 is ring piece shape ndfeb magnets of axial charging, and non-magnetic conduction securing member 5900 is made up of non-magnetic conduction packing ring 5890, non-magnetic conduction screw 589, non-magnetic conduction nut 5894.Top crown 503A, permanent magnet 502, bottom crown 503B have equal diameters and the corresponding through hole of arranging, non-magnetic conduction screw 589 passes and by non-magnetic conduction packing ring 5890 and non-magnetic conduction screw 589 top crown 503A, permanent magnet 502, bottom crown 503B linked from through hole and is fixed as core outside the magnetic circuit.Cylinder shape magnetic 513 is sleeved on the convex column 512 of framework 501, because a part of evagination of non-magnetic conduction securing member 5900 is outside bottom crown under the side plane 50300B, therefore must set up an annular groove 539 in the outside of annular groove 535, its width and the degree of depth and 8 groups of non-magnetic conduction securing members 5900 are complementary.Except above-mentioned points, the description of the structure of present embodiment, operation principle and Fig. 2, Fig. 5 is identical and no longer repeat, and for further details, please refer to respective element that specification lists and label corresponding relation and combines Fig. 2 and Fig. 5 is set forth.
Fig. 8 shows the circular dull and stereotyped sectional arrangement drawing of concave shaped of the embodiment of the invention 6.
In the present embodiment, the top crown of magnetic circuit and bottom crown are the circular flat boards of concave shaped that is provided with two central axis holes, the bore D2 of one of them axis hole is littler than the bore D1 of another axis hole, little that axis hole of bore is near the outside horizontal plane of described top crown and bottom crown, constitutes two coaxial isometrical described annular magnetic gaps between the outer peripheral face of its vertical side face and described cylinder shape magnetic.
As seen from Figure 8, with circular dull and stereotyped introduced among embodiment 3 above-mentioned several embodiment in addition circular dull and stereotyped that replace of this concave shaped, just can make successfully long stroke or ultra-long-stroke double-coil double-magnet gap transducer with " short magnetic gap and long voice coil ".
On the contrary, if the various circular flat board that will introduce in the foregoing description (except the embodiment 3) changes into hydromagnetic iron thickness and compares the circular dull and stereotyped and shorter transducer winding of supporting axial height of the superthick that seems thicker, we can make successfully long stroke or the ultra-long-stroke double-coil double-magnet gap transducer with " long magnetic gap and minor circle " equally.
It is to be noted at last: utilize all the magnetic structure patterns shown in Fig. 1 to Fig. 8, different permanent magnets, different frameworks and carrier structure and different transducer winding connectivity scenarios, can permutation and combination become various dissimilar double-coil double-magnet gap transducers.Though the present invention can't enumerate out one by one with all these embodiment, but, no matter will above-mentioned technical characterictic of the present invention permutation and combination even make such or such local modification how, their overall technological scheme and design core content all can't surmount the coverage that claim of the present invention and this specification have proposed.
The present invention has following major advantage:
1, high sensitivity. Under bore, the material prerequisite suitable with the vibrational system quality, improved about 2～16 times than the efficient of conventional loudspeakers.
2, high fidelity. Can make all kinds of electroacoustic transducers that have resistance load characteristics or be similar to resistance load characteristics, for example, cooperate suitably Conical diaphragm after just can make the coaxial concurrent full range speaker of 2～6 inches bores of success.
3, can make up easily all kinds of electromechanical transducers of implementing short stroke, moderate stroke, long stroke or ultra-long-stroke.
4, volume is small and exquisite, simple in structure, cost performance is high, be easy to implement scale production.
Claims (9)
1, a kind of double-coil double-magnet gap transducer, comprise magnetic circuit and link all-in-one-piece carriage or framework with it with permanent magnet, two coaxial isometrical annular magnetic gaps and a coil rack that inserts magnetic gap, wound in parallel electric wire insulated from each other and constitute two coils on it, the taper shape or the ball that link together with coil rack and elastic damping plate push up shape or planar shaped vibrating diaphragm or plane phonation board, piston motion by coil rack drives described vibrating diaphragm or phonation board vibration sounding, perhaps detect the sound pressure variations of sound and in coil, sense corresponding audio signal, it is characterized in that by described vibrating diaphragm:
The top crown of described magnetic circuit and bottom crown are circular flat boards that is provided with central axis hole; An or oily shape flat board that is provided with two central axis holes; Be provided with the rare-earth permanent magnet of axial charging between described top crown and the bottom crown; The N utmost point of described permanent magnet and S utmost point pole-face have symmetrically surface electric field intensity or equal magnetic figure; Having enough big volume and magnetic energy product makes the interior magnetic induction intensity of described annular magnetic gap reach an annular ndfeb magnet or fan-shaped or disc or the ring piece shape ndfeb magnet that above uniform thickness is uniform of hypersaturated state
Constitute two coaxial isometrical annular magnetic gaps between the vertical side face of central axis hole with the outer peripheral face of described top crown and the coaxial mounted cylinder shape magnetic of bottom crown and described top crown and bottom crown, go into coaxial mounted two coils in described annular magnetic gap interpolation, two coils of regulation around to and the sense of current of flowing through coil, make described coil produce unidirectional electric power F in same work moment
Central axis with described top crown and bottom crown axis hole is a vertical axis of symmetry, bisector X-X axis with described permanent magnet 1/2nd axial heights is a horizontal symmetry axis, described double-coil double-magnet gap transducer has about aspect geometry and the magnetic property, laterally zygomorphic two groups of magnetic circuits and in geometry and electrical property side and about, laterally zygomorphic two groups of coil circuits, stipulate two described coils after being connected in series around to just opposite, the wire cross-section of two described coils is long-pending, the absolute letter of the number of turn and inductance value is equal to each other, described double-coil double-magnet gap transducer is a transducer with resistance load characteristics
The carriage that non-magnetic conduction rigid material is made be bonded on the outer side plane of described bottom crown and by the securing member that one group of non-magnetic conduction rigid material is made described cylinder shape magnetic, bottom crown, permanent magnet and top crown are connected to as a whole,
Perhaps, described top crown, permanent magnet, bottom crown are embedded into the uncovered cylinder inwall that is installed in the framework that a non-magnetic conduction rigid material makes and the convex column by the framework axis part connects to described cylinder shape magnetic and described bottom crown, permanent magnet, top crown as a whole.
2, the double-coil double-magnet gap transducer of stipulating according to claim 1, it is characterized in that: described permanent magnet is one group of ring piece shape ndfeb magnet that uniform thickness is uniform, be provided with on described top crown and bottom crown and the corresponding through hole of described permanent magnet axis hole, the securing member that one group of non-magnetic conduction rigid material is made inserts the axis hole of each described through hole of described top crown, bottom crown and described permanent magnet and they is connected to as a whole.
3, the double-coil double-magnet gap transducer of stipulating according to claim 1, it is characterized in that: the annular coupling piece bonding that the top of described coil rack and non-magnetic conduction rigid material are made is fixing, the outside horizontal plane bonding of a described plane phonation board and described annular coupling piece is fixing, a described elastic damping plate is bearing on the outer side plane of described top crown and with itself and described coil rack bonding to be decided together, constitutes a flat electroacoustic transducer of superpower power with double-coil double-magnet gap thus.
4, double-coil double-magnet gap transducer according to claim 1 regulation, it is characterized in that: the carriage that non-magnetic conduction rigid material is made, its central part is provided with an axis hole, the outside of described axis hole is provided with an annular inner concave platform face, the outside of described annular inner concave platform face be provided with one with the corresponding annular groove of described annular magnetic gap, the bottom land of described annular groove is provided with convection current pore uniform more than three, the outside of described annular groove is provided with coaxial and the fixing loop bracket mounting plane of the outer side plane bonding of described bottom crown, the securing member that cylinder shape magnetic is made by one group of non-magnet material is bonded and fixed on the described annular inner concave platform face of described carriage, constitute two coaxial isometrical annular magnetic gaps between the vertical side face of the outer peripheral face of described cylinder shape magnetic and described top crown and bottom crown central authorities axis hole, constitute the described symmetrical magnetic circuits of a described transducer thus.
5, according to the double-coil double-magnet gap transducer of claim 4 regulation, it is characterized in that: described carriage is made by engineering plastics or aluminium alloy.
6, double-coil double-magnet gap transducer according to claim 1 regulation, it is characterized in that: the framework that non-magnetic conduction rigid material is made, the waist of described framework is provided with a coaxial uncovered cylinder, described uncovered cylinder the tube end inner side plane be provided with one with the corresponding annular groove of described annular magnetic gap, the bottom land of described annular groove is provided with convection current pore uniform more than three, the inboard of described annular groove and the outside are respectively equipped with two coaxial annular flat table tops, the axis part of that annular flat table top placed in the middle is provided with the convex column that a non-magnetic conduction rigid material is made, described cylinder shape magnetic is sleeved on the described convex column, and with described top crown, permanent magnet, bottom crown embeds and is installed in the uncovered cylinder of described framework, constitute two coaxial isometrical annular magnetic gaps between the vertical side face of the outer peripheral face of described cylinder shape magnetic and described top crown and bottom crown central authorities axis hole, constitute the described symmetrical magnetic circuits of a described transducer thus.
7, according to the double-coil double-magnet gap transducer of claim 6 regulation, it is characterized in that: described framework is made by engineering plastics or aluminium alloy.
8, according to the double-coil double-magnet gap transducers of claim 1,2,4 or 6 regulations, it is characterized in that: also be provided with one on described carriage that cooperates with the outer side plane of described bottom crown or the described framework described non-magnetic conduction rigid material securing member evagination partly embedded toroidal cavity in it.
9, according to claim 1,2,4 or 6 double-coil double-magnet gap transducers of stipulating, it is characterized in that: the top crown of described magnetic circuit and bottom crown are the circular flat boards of concave shaped that is provided with two central axis holes, the bore of another axis hole of relative aperture of one of them axis hole is little, little that axis hole of bore is near the outside horizontal plane of described top crown and bottom crown, and its vertical side face constitutes two coaxial isometrical described annular magnetic gaps with the outer peripheral face of described cylinder shape magnetic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610020317 CN101026901A (en) | 2006-02-20 | 2006-02-20 | Double-coil dual magnetic gap transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610020317 CN101026901A (en) | 2006-02-20 | 2006-02-20 | Double-coil dual magnetic gap transducer |
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| CN101026901A true CN101026901A (en) | 2007-08-29 |
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|---|---|---|---|
| CN 200610020317 Pending CN101026901A (en) | 2006-02-20 | 2006-02-20 | Double-coil dual magnetic gap transducer |
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