CN100551133C - Bending wave acoustic radiator - Google Patents
Bending wave acoustic radiator Download PDFInfo
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- CN100551133C CN100551133C CNB028068688A CN02806868A CN100551133C CN 100551133 C CN100551133 C CN 100551133C CN B028068688 A CNB028068688 A CN B028068688A CN 02806868 A CN02806868 A CN 02806868A CN 100551133 C CN100551133 C CN 100551133C
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- thin slice
- bending wave
- acoustic radiator
- hardening component
- fold
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/029—Diaphragms comprising fibres
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Building Environments (AREA)
Abstract
The plate shaped acoustic radiator of a kind of bending wave, it is formed by sheeting, to limit a sound active area, and comprise the hardening component of the integral body of at least one fold form, this hardening component extends to outside the plane of thin slice, and the local at least sound active area that strides across radiator, this hardening component is U-shaped cross-section substantially.A kind of method of making the plate shaped acoustic radiator of bending wave, comprise thin slice is formed panel, this panel has at least one whole fold element, this fold element extends to outside the plane of thin slice, and the part strides across thin slice at least, and be roughly U-shaped cross-section, have the desirable ability that can support and propagate bending wave so that thin slice hardened into.
Description
Technical field
The present invention relates to a kind of bending wave acoustic radiator, this acoustic radiator for example is used in the sort of loud speaker described in the application WO97/09842 of new Conversion Works Inc. (New Transducers Limited).
Background technology
Be well known that plane lamina or plate can be for example by making this thin slice fold or by a pattern is molded or be pressed in thin slice or the plate and strengthened, see the GB2336566A of S.P.Carrington, this patent shows that the complicated fold that comprises two or more notion axles (conceptual axes) can increase the bending hardness of thin slice.
At present, the plate shaped acoustic radiator of bending wave is made by following composite material usually, and this composite material comprises the core that is clipped between the superficial layer, although this radiator can be the whole block structure of plastics, metal or cardboard for example.
In addition, can learn the plate shaped acoustic radiator of sclerosis, so that its bending hardness changes to some extent on its zone from the WO00/15000 of new Conversion Works Inc..
From the WO00/65869 of new Conversion Works Inc., also can learn, make the part within the contact ring of the voice coil loudspeaker voice coil that is positioned at the moving coil vibratory transducer in the bending wave panel of loud speaker become dish, this moving coil vibratory transducer is installed on the panel, so that for panel provides points hardness, thus control hole resonance (aperture resonance).
Summary of the invention
The purpose of this invention is to provide a kind of simple and relatively inexpensive plate shaped acoustic radiator of bending wave.
From an aspect, the present invention is the plate shaped acoustic radiator of a kind of bending wave, this acoustic radiator is formed by sheeting, to limit a sound active area, and comprise the hardening component of the integral body of at least one fold form, this hardening component extends to outside the plane of thin slice, and the local at least sound active area that strides across radiator, and this hardening component is U-shaped cross-section substantially.
Thin slice is uniform thickness substantially on the sound active area, and this thickness forms within the restriction that hardening component applied in integral body.
The plate shaped acoustic radiator of bending wave can comprise and is arranged to striding across the upwardly extending hardening component of a plurality of sides of sound active area.
The plate shaped acoustic radiator of bending wave can comprise the hardening component that is arranged to parallel array.
Hardening component can stride across the sound active area substantially fully and extend.
The sound active area can be filled the hardening component with tight spacing basically.
Hardening component can be rectilinear.
Hardening component can roughly be arranged to radial arrays, and this radial arrays will be located the position of vibration exciter on the sound active area and be extended.The part of the general plane in the sound active area of thin slice can be limited between substantially radially the hardening component.
Hardening component can be basic uniform cross-sectional area on its length.
The sound active area can roughly be a rectangle, and hardening component can extend with the edge of sound active area angledly.
Hardening component can be annular, perhaps can disperse.
Hardening component can comprise the each several part that their length is extended in different directions.
Hardening component can be shaped as the cross section rounding, to avoid sharp edges.
Sheeting can be the material of plastically deformable.
Thin slice can comprise the local at least terminal area around the sound active area.
Acoustic radiator can be made of thin slice.The plate shaped acoustic radiator of bending wave can be made of the thin slice of a plurality of fold.The combination Face to face of a plurality of thin slices.Fold on a thin slice can be angled with respect to the adjacent fold on contiguous slices.
This hardening component or each hardening component uniformity highly substantially on its length.
From another point of view, the present invention is a kind of loud speaker, and this loud speaker comprises the plate shaped acoustic radiator of bending wave and is coupled to vibratory transducer on the sound active area of panel.
Panel can be hot formed plastics.Vibratory transducer can be installed on the side of panel, and plastics move on this side, so that form hardening component.
From more on the one hand, the present invention is a kind of method of making the plate shaped acoustic radiator of bending wave, it comprises: thin slice is formed panel, this panel has at least one whole fold element, this fold element extends to outside the plane of thin slice, and the part strides across thin slice at least, and is roughly U-shaped cross-section, has the desirable ability that can support and propagate bending wave so that thin slice hardened into.
This method can comprise arranges at least one hardening component, so that the sclerosis thin slice, the ideal frequency that is supported in standing wave in the panel distributes.
This method can comprise thin slice formed to have one or more edges or other parts, is used for acoustic radiator is connected to or is supported on framework or other bracing or strutting arrangements.
This method can comprise formation edge or other coupling parts, so that resilient suspension to be provided.
This method can comprise formation edge or other parts, so that following device to be provided, can retrain the sound active area of thin slice basically by this device.
This method can comprise the arrangement of selecting hardening component, so that reduce or be limited to the mean free path of the line (line of bending weakness) of the bending reduction in the sound active area of thin slice.The degree that this respect is carried out depends on the desirable characteristics and the each side such as required frequency range of the panel that is obtained.
This method can comprise in conjunction with stacked a pair of fold thin slice.Stacked thin slice can pass through solder bond.Welding can comprise surface-coated thermoplastic to be welded on thin slice, and this thermoplastic has the fusing point of the material that is lower than thin slice; The sheet plane opposite is formed contact, and heating sheet, with the fusing coating, so that thin slice is fused to together.
This method can comprise and the fold on one in the thin slice is arranged to this angled to the fold on another in the thin slice with respect to this.
This method can comprise manufacturing by thin slice or a plurality of, that is, and and the acoustic radiator that two or more thin slices constitute.
Thereby by hot forming or any other suitable technology, sheeting can change the dull and stereotyped acoustic radiator of the bending wave with useful quality hardness ratio into.This panel can be supported the bending wave sympathetic response, and can be used to comprise the different various acoustics of distribution pattern of loud speaker.
Thin slice is formed marginal portion, liner or the tape that panel can comprise the plane, so that for example be installed on the ground structure of framework, perhaps be used for viscosity to be connected on the ground structure by the elasticity short column.Follow distribution pattern instruction for the useful distribution of bending wave sympathetic response pattern in the sound equipment panel, the bending hardness that brings to definite form by hardening component has multiple directional characteristic, they can alignment relative and big or small aspect adjusted so that reach selected model frequency distribute (modalfrequency distribution).
Can in macroscopical unit, carry out Computer Analysis, check the characteristic of whole front panel, for example, aspect the matching panel aspect ratio, simultaneously, the microcosmic modeling can be checked the subordinate part of hardening component pattern, so that explore the relation of the vibratory transducer of points hardness and suitable drive point and panel.
For given panel size, can bi-directional scaling or determine the size of given hardening component pattern.So that change the characteristic of panel.For example, the vertical image of panel can convergent-divergent, or in addition can its be applied to can be shaped or mouldable thin slice aspect reduce.In relevant context, hardening component can be based on fractal graph, this figure and limited block or other Infinite Cyclic sequences similar.Different fractal algorithms provides useful design for the variation of average path length and direction hardness.In addition, the combination of hardening component pattern can be distributed on the panel zone, with the bending hardness that provides widely or localize.This valuable characteristic can be used for balance or balance frequency scope and frequency response, changes the relation of sound power and frequency with the zones of different that can change for the directivity along selected axle.The sound false defect (artefacts) that also can mix or smoothly produce at the critical frequency place, at the critical frequency place, the velocity of wave in the panel is a times or many times of speed of sound in the air.
From a viewpoint, the hardening component pattern can be counted as comparing with the continuity of known bending wave panel more discrete spring and quality sequence.In the discrete feature process of design bending wave panel structure, make the test of the microstructure of the complicated panel characteristics that it can be in by bending, the degree of freedom of the combination of each regional performance of fine setting and desirable characteristics is provided to the designer.On the one hand, bending wave panel is synthetic by the enough big definable designated components of density, makes this panel roughly equiv in even panel construction.This panel itself bears simple or complicated bending, and can comprise whole sound equipment load.
No matter whether transparent material be, the hardening component pattern also can perhaps provide selected translucent ornamentally as a for example texture.Even under translucent, whole light transmission can be higher.Thereby panel of the present invention goes for the light diffuser in conjunction with acousto-optic system, and in this case, the sound equipment panel also is a diffuser.The hardening component pattern that leads on the sound can combine with Fresnel lens, and this Fresnel lens equivalence composition additionally provides the illumination that is guided so that combine with the work of acoustic panels.
By being generally intrafascicular approximately that the U cross section given, the sidewall of hardening component fold can be approximated to be vertical or inclination, perhaps be endowed required form, sinusoidal shape for example is so that change stress-strain relation between plane domain or land regions and the sidewall sections.Might be on the zone of panel and/or on the length at hardening component, the degree of depth and side wall profile change.
The hardening component pattern range can for the concentric ring of spiral, annular to the group or the array of angular variation, perhaps Huan Xing orthogonal subsets (rectangular subset), or parallel straight line.The regular pattern of thin slice mid-plane can be changed by the pattern to the opposite side skew of thin slice mid-plane, thereby break axial symmetry with respect to the transverse curvature axle of panel.Can use various mathematics and repeat function, comprise fractal form at hardening component.
Because the variation of design process, can be with unusual or unpredictable shape, for example, the natural form for fish, bird, animal or the handicraft of decorating loud speaker forms useful distribution pattern work, for example is similar to the instruction near the best distribution pattern.
Description of drawings
By example, the present invention schematically shows in the accompanying drawings, among the figure:
Fig. 1 is the plane graph of plate shaped bending wave loudspeaker;
Fig. 2 is the partial cross section view on the line A-A of Fig. 1;
Fig. 3 is the partial cross section view on the line B-B of Fig. 1;
Fig. 4 is the partial cross section view on the line C-C of Fig. 1;
Fig. 5 is the frequency response curve of the loud speaker of kind shown in Fig. 1 to 4;
Fig. 6 is the plane graph of another embodiment of sound equipment barrier film;
Fig. 7 is the frequency response curve of loud speaker of utilizing the sound equipment barrier film of Fig. 6;
Fig. 8 to 11 is plane graphs of an embodiment again of sound equipment barrier film;
Figure 12 is the perspective view of an embodiment again of sound equipment barrier film;
Figure 13 is the plane graph of the another embodiment of sound equipment barrier film;
Figure 14 is the partial cross section view on the line X-X of Figure 13;
Figure 15 is the cross-sectional view that is similar to another embodiment that passes the plate shaped loud speaker of bending wave of Fig. 4;
Figure 16 is the plane graph that the sound equipment barrier film of engineering simulation is shown;
Figure 17 is the sound equipment barrier film plane graph of an embodiment again;
Figure 18 is the partial cross section view on the line E-E of Figure 17;
Figure 19 is the plane graph of another embodiment of sound equipment barrier film;
Figure 20 is the end view of the barrier film of Figure 19 of obtaining of the arrow A direction at Figure 19;
Figure 21 is the end view of the barrier film of Figure 19 of obtaining on the arrow B direction of Figure 19;
Figure 22 a, b and c are the end views corresponding to Figure 21, and various multi-form that each layer of the barrier film among Figure 19 is secured together is shown; And
Figure 23 adopts the sound power output of loud speaker of barrier film as shown in figure 19 with respect to the curve of frequency.
Embodiment
In Fig. 1 to 5 of accompanying drawing, show loud speaker 1, it has rectangular bend flat plate ideophone sound radiator or barrier film 2, barrier film 2 its periphery 5 be installed to medium density fibre board (MDF) (MDF) around rectangular frame 3 in.As shown in Figure 4, the periphery 4 of barrier film is fixed on the framework by two-sided tape 5, thereby defines a sound active area 13 that is centered on by standing part 5.Inner moving coil bending wave exciter 6 is via coupler loop 8, for example be coupled on the barrier film in the approximate centre position 7 of barrier film down the auxiliary of adhesive means.Thereby when the signal of telecommunication was applied on the exciter, exciter can be applied to the bending wave energy on the barrier film and cause the barrier film vibration, and for example, as instructing in WO97/09842, barrier film resonates as distributed mode device thus.
Barrier film is listed as the roughly linear fold 9 of U-shaped cross-section by the plastic tab hot forming on plane thereby have one, and this fold 9 is radiated the periphery 4 of barrier film from the approximate centre actuator position.The degree of depth of each fold and profile are constant on its length.As shown in the figure, have 16 fold, they are arranged with 22.5 ° mutual angle from actuator position.The radial arrays of fold 9 defines the delta-shaped region 10 of the general plane of barrier film between them.
The inner 11 (this is the part that fold is in the coupler loop inboard) that is to be noted that fold 9 is extended and is connected, and forms fold 9 parallel arrays 12 of a tight spacing, thereby provides additional hardness for the part of barrier film in coupler loop 8 inboards.Coupler loop works effectively in the mode on the top layer on the composite panel core, and on X and Y direction the differential hardening panel.This causes the panel of soft to present higher bending hardness at the activation point place, and this is being realized that by the small panel size in good low frequency and the high frequency output be useful.
Fig. 5 is that this loud speaker has a barrier film according to the acoustic pressure grade of the loud speaker of Fig. 1 to 4 curve with respect to frequency, and this barrier film has the active area of 120mm * 80mm size, and whole lamina dimensions is 130mm * 90mm.This measurement is in the rear portion unlatching, does not have in the free space that blocks under the condition, is carrying out under the 85dB/W of 0.5m place on the axle.Barrier film is formed by the black polypropylene copolymer thin slice vacuum of 400 μ m thickness.This framework has the overall dimensions of 150mm * 110mm, defines the hole of 120mm * 80mm.Panel is provided by the wide double-sided pressure-sensitive adhesive tape of 5mm around whole framework towards the terminal of framework.The bonding of exciter on barrier film is by means of the acrylonitrile binding agent, and its position on barrier film is in 4/9ths Lx, 3/7ths Ly positions, as instructing in WO97/09842.
In Fig. 6, show another form of the sound equipment barrier film 22 that for example is used for plate shaped bending wave loudspeaker, the barrier film 22 shown in this barrier film and Fig. 1 to 4 is roughly the same type.As shown in Figure 6, barrier film 22 is thin slices, and it is with parallel array 23 sclerosis of the angled straight lines shape fold 24 of sine curve cross section, and this has greatly increased barrier film and is hanging down as for the bending hardness on the direction of fold, and barrier film is centered on by edge or peripheral part 4.
As the example of the embodiment of Fig. 6, make the panel of 200mm * 60mm.This panel is made by the thick polypropylene copolymer film vacuum forming of 400 μ m.In this case, the fold pattern is made of the straight fold with sinusoidal cross-section.These fold are oriented to 10 ° with respect to the Lx axle of panel, to realize filling (modal fill) for the intimate best mode of panel aspect ratio.Barrier film utilizes the traditional vacuum forming technique by an instrument manufacturing.
According to the instruction in WO 97/09842, (89mmLx 85mmLy) locates to determine the sound equipment performance by the Electromagnetic Drive motor of 4 ohm of 25mm diameters or exciter (Tianle 0998-04) binding agent are bonded in a position.Panel utilizes pressure sensitive adhesives to be installed to picture frame rigidity, backside openings (on the 245mm * 100mm), so that the terminal of a constrained edge is provided, and does not have independent suspension.The sound equipment performance of loud speaker (measuring under 0.5m place, the driving voltage 2.83V situation on axle) is shown among Fig. 7, and this figure shows and can realize that good low frequency and high frequency extend with less panel zone, and has good mode filling.In this case, with 120cm
2The panel area realize that 180Hz is to the bandwidth of 18kHz (specify in-6dB by the bandwidth at a place).This also shows with such panel can realize good sound output, and does not need independent flexible suspension (compliantsuspension).
Fig. 8 to 11 illustrates the another kind of possible pattern of the fold on the sound equipment barrier film constructed in accordance.Fig. 8 illustrates sound equipment barrier film or the radiator 31 with discrete fold 32 patterns, and this fold roughly strides across radiator obliquely extends, and each fold is made of one group of interconnected parallel sine curve.Fig. 9 to 11 illustrates sound equipment barrier film or the radiator (being respectively 41,52,61) with another kind of fold pattern, and they are made of the sine curve that extends to the other end from radiator one end.
Figure 12 is the perspective view of another embodiment of sound equipment barrier film 71, this barrier film roughly with Fig. 6 in similar, but wherein fold 72 is parallel to the minor face edge of rectangular tab, and tight spacing strides across thin slice from a long limit fully to another long limit and extends.The cross section of fold is roughly square.
Figure 13 is the plane graph of another possible sound equipment barrier film 81, and this sound equipment barrier film has for the zigzag form and is fold 82 patterns of general square shape cross section, as shown in figure 14.Figure 13 illustrates fold on thin slice two kinds may arrangements,, are parallel to the long limit extension of thin slice or with respect to the angled θ in long limit of thin slice that is.
Figure 15 is the cross-sectional view that passes the plate shaped loud speaker 90 of the bending wave that is roughly type shown in Figure 4, this loud speaker is formed with fold 92, and the hot forming thin slice that wherein forms sound equipment barrier film 91 is provided with marginal portion 93, this marginal portion forms resilient suspension, and barrier film 91 is supported on the framework 94 thus.In this case, barrier film forms sealed hollow 96 with backboard 95.
Figure 16 is the view that is used for the thin slice 101 of the plate shaped acoustic radiator of bending wave, a part 102 is exaggerated among this figure, so that the zone of dispersion of thin slice to be shown, for example macroscopic view or microcosmos area are how can be by these zones being thought forming a series of quality 103 that connected by spring 104 is analyzed.The vibration exciter position is by 105 signs.
With reference to Figure 17 and 18, there is shown and be used for for example plate shaped bending wave sound equipment barrier film or the radiator 122 of the loud speaker of type shown in Figure 4, and wherein this radiator is made of the thin slice 123,124 of two overlapping hot forming fold, this thin slice for example is the type shown in Fig. 6 and Fig. 8 to 14, and two thin slices for example are bonded to together by means of binding agent or by the solder side opposite.At thin slice is under the polyacrylic situation, and the face that connect is coated with the thermoplastic lower than the polypropylene fusing point of thin slice, with two thin slice combinations, and can not melt thin slice itself thereby this coating can melt.
As shown in the figure, the fold on two thin slices 123,124 is rectilinear, and is roughly square cross section, strides across thin slice obliquely and extends.The angle of fold on thin slice is arranged to different, and in the example shown, the spacing of fold is also different.
In Figure 19 to 23, show the embodiment of the bending wave sound equipment barrier film 131 that is roughly Figure 17 and 18 shown types, that is to say, this sound equipment barrier film 131 comprises a plurality of flaggies or layer, be the hot formed fold thin slice or the layer 132,133 of two essentially rectangulars in the present embodiment, these two layers are mutually the same, and wrinkling with the long limit that fold is parallel to thin slice along thin slice except one deck 132, and that the minor face that another layer or thin slice 133 are parallel to thin slice with fold strides across thin slice is wrinkling.Thereby, the extension that meets at right angles of the fold on two thin slices 132,133, shown in arrow C and D among Figure 19, this angle θ that is included as 90 ° is interior.Fold on two thin slices is the general square shape cross section, and height is identical with spacing.
Two layers or thin slice can be for example by any method combinations shown in Figure 22 a, b and the c.In Figure 22 a, thin slice 132,133 adhesive film 134 combinations by inserting, this binding agent activates by heating, and forms a barrier film so that thin slice is secured together.In Figure 22 b, thin slice connects by thermal welding.This can realize in the following way, promptly, with in the surface of facing of thermoplastic (not shown) coated platelet one or two, this thermoplastic has the fusing point that is lower than thin slice, thereby when heating, this layer can melt, and is perhaps softening at least, thereby causes each layer to be fused to together when thin slice forms contact.In addition, thin slice itself can directly soften, and, does not have the coating inserted that is, and softening to is enough to the degree that causes thin slice to be secured together when formation is in contact with one another.In Figure 22 c, one or two in the opposed face of two thin slices for example is printed with adhesive pattern 135 by silk screen printing, thereby thin slice connects together when they form contact.
As the example of the embodiment of Figure 19, loud speaker forms has the planar separator that is of a size of 190mm * 125MM, and every layer of thin slice by the thick acrylate film of 250 μ m forms.Each layer utilizes Sarna-Xiro Puro H hot-melt adhesive to be laminated to together, and this binding agent ratio with every square metre of 25gms before the vacuum forming thin slice is with each layer that forms fold is coated on each layer.Stacked condition be under nominal pressure 80 ℃ continue 5 minutes.
Panel is fixed on the rectangular wooden picture frame that overall dimension is 210mm * 145mm by the suspension that is made of the wide foamed plastics of 5mm (Miers M101A) tape, this wooden picture frame back opening, and should hang around all edges of panel and extend.The inner moving coil vibration exciter of 4 ohm of Tianle of a 19mm is fixed on the panel with Loctite 406 acrylonitrile binding agents.Figure 23 be the 2.83V driving voltage measured at the 0.5m place loud speaker from the shaft power response curve.
The present invention can be illustrated as producing the method for the complicated modal distribution outside the sympathetic response of plane, and this satisfies the demand of electroacoustic standard.The final objective function can comprise the size of considering barrier film, sound equipment condition (for example type of local boundary and obstacle), desirable frequency response, to the step of the possible restriction of sheeting, if necessary, add the position of excitation and the consideration of the correlation properties of motivational techniques.
The step that complicated distribution can begin to analyze by the definable element with relative moderate quatity (few to three), and extract then and with the analytical structure expansion, with the quantity of increase element, thereby pattern density reaches gratifying degree.
Industrial applicability
Past when making distributed mode loudspeaker (DML), exists two kinds of main panels to select, That is: whole or clamping profile plate. According to prior art, the fundamental frequency of these panels and panel hardness, Size is relevant with weight. The fundamental frequency of panel passes through to increase size and the surface density of panel, and by reducing Panel hardness reduces.
The high frequency expansion is by panel hardness, core sheath modulus (in clamping profile plate situation) and electromagnetic excitation The coupler loop diameter of device is determined. In this case, high frequency performance is by increasing panel hardness and core The sheath modulus also improves by reducing the coupler loop diameter.
For the low panel hardness of good low frequency performance with for the need of the high rigidity of good high frequency expansion Ask when making small panel (littler than A4) and can cause limit bandwidth.
The fold of the high frequency performance by increasing panel, the profile of fold, shape and orientation can be used for The bending hardness of control panel. This so that panel characteristics can customize so that can be on a large scale The panel aspect ratio realizes good mode performance. The fold profile can be uniformity also, or comprises The amplitude and/or the wavelength that change.
The panel of fold can be by the multiple material manufacturing, and this material is including, but not limited to polymer, change Compound, paper, metal and pottery. These materials can be the lamination system of solid monolithic, foam, multilayer The form of product or their combinations. The thickness of base material depends on final panel size, but may Between 100 μ m and the 2mm. The panel of fold can utilize multiple manufacturing process to form this manufacturing process Including, but not limited to vibration shaping, pressing mold, injection molding, extrusion molding, machined and casting.
Manufacturing process utilize an instrument as " duplicate " of parts (for example vacuum forming, Injection molding, pressing mold and casting) situation under, panel suspension can be incorporated in the panel construction, for example as Shown in Figure 15. Since its compliance of profile, shape and form control of this suspension of forming, therefore Might design following suspension, so that panel is installed on housing or the framework rigidly, for example, as Shown in Fig. 1 to 4. This has just eliminated needs the separately demand of suspension, and prevents the free edge of panel Potential painted (coloration) source has been eliminated in resonance.
The method of replacing can be to form respectively different qualities not for sound active area and panel suspension Same sheeting, different parts connects in any easily mode, for example by binding agent, or Substantially connect when jointly being shaped them.
Use specific purpose tool also can realize the feature of adding, such as anchor clamps point, the driving horse of auxiliary assembling Reach and the quality retainer rings. These features can be used for simplifying assembling parts and/or improve the attractive in appearance of panel.
Thereby these aesthetic characteristics for example can comprise superficial makings, handicraft, trade mark and product mark Know.
When making the panel of fold by vacuum forming, the design of operational characteristic counter plate has applied many Individual restriction. The particularly important is, thin polymer film is because it follows the profile of instrument and attenuate. Usually, Do not recommend to surpass 75% draw ratio, because this can impel the undue attenuate of film. In the DML purposes In owing to fatigue resistance along with film thickness reduces, so particular importance.
This restriction for draw ratio has a significant impact the highest hardness tool that can realize, and therefore Structure tool to fold has a significant impact. For panel hardness is doubled, be parallel to fold direction Dy's The degree of depth of fold and width need to double, to keep 75% draw ratio. Yet, because the fold degree of depth Do not affect the hardness Dx across fold, therefore, the anisotropy of panel also doubles.
The attenuate of thin polymer film also affects the voice response of panel in shaping process. To encourage The thin side that device is installed to panel causes high frequency output to weaken. In order to realize best high frequency performance, excitation Device can be installed to the discontiguous surface of instrument on.
The advantage of the plate shaped acoustic radiator of bending wave of the present invention comprises:
By suitable forming technology molded/forming process in, the driver zone on the panel can Not have in the situation of extra cost for HF performance more and hardening;
2. the center of hardness can be offset in no extra cost situation equally easily, can improve thus The mode at unoptimizable actuator position place on how much;
3. the bending wave characteristic of panel can be controlled by hardening component form and the degree of depth;
4. because its quality/hardness ratio can be very low, can be without lifting an eyebrow and in the feelings of no extra cost Realize higher acoustic efficiency under the condition;
Hardening component with mechanism map can make potentially panel obtain in practice higher vibration with The machine degree;
6. owing to the ability of handling easily the hardness profile, the sort of type of describing among the WO 98/39947 In practice easier realization of DML, this DML has the high frequency performance of adjusting and total tone Balanced capacity and the centre-driven integrated with the eardrum scope, the dynamic equilibrium driver;
7. habitual by forming with same material " roller around " or similarly flying characteristic, can Do not have in the extra cost situation framework to be realized the real low distortion interface of accepting traditionally;
8. utilize the hardening component of concentric/spiral pattern, can realize having the controlled radiation table for frequency The eardrum radiator of area;
9. the whole fact of being made by sheeting of acoustic radiator panel, tolerance in practice only by The tolerance domination of single material, this provides sizable advantage in the mill;
10. by the same token, such as the material behavior of panel damping can by select raw material and/ Or damping layer directly controls;
11. material is not limited to synthetic plastics material, and can be pulpous state or egg case (egg-crate) material Material, this material cost is very low, and applicable in certain purposes. The material behavior of sheeting Can pass through suitable filter, for example nanofilter is improved, so that good hardness-weight to be provided The amount ratio.
Claims (32)
1. plate shaped acoustic radiator of bending wave, its material by the plane lamina form is made, to limit a sound active area, and comprise the whole hardening component of at least one fold form, this hardening component extends to outside the plane of thin slice, and the local at least sound active area that strides across radiator, make the planar section of this thin slice keep, this hardening component is U-shaped cross-section substantially; And this acoustic radiator constitutes by the thin slice of a fold or by the thin slice of a plurality of fold.
2. the plate shaped acoustic radiator of bending wave as claimed in claim 1, wherein, described thin slice is a homogeneous thickness on the sound active area substantially, this zone is within the restriction that is applied by the monolithic molding of hardening component.
3. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2 is characterized in that, comprises being arranged to stride across the hardening component that the sound active area is extended on a plurality of directions.
4. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2 is characterized in that, comprises the hardening component that is arranged to parallel array.
5. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2, wherein, hardening component strides across the sound active area fully and extends.
6. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2, wherein, hardening component is rectilinear.
7. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2, wherein, the hardening component basic setup becomes radial arrays, will locate the position of vibration exciter on the sound active area and extend, the part of the general plane of thin slice sound active area is limiting between radially the hardening component basically.
8. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2, wherein, hardening component is a uniform cross-sectional area on its length substantially.
9. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2, wherein, the sound active area is roughly rectangle, and the edge of the relative sound active area of hardening component extends angledly.
10. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2, wherein, hardening component is annular.
11. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2, wherein, hardening component comprises the each several part that extends along the different length direction.
12. the plate shaped acoustic radiator of bending wave as claimed in claim 1 or 2, wherein, hardening component disperses.
13. the plate shaped acoustic radiator of bending wave as claimed in claim 12, wherein, hardening component is configured as rounding in cross section, to avoid sharp edges.
14. the plate shaped acoustic radiator of bending wave as claimed in claim 1, wherein, sheeting is the plastically deformable material.
15. the plate shaped acoustic radiator of bending wave as claimed in claim 1, wherein, thin slice comprises the local at least terminal area around the sound active area.
16. the plate shaped acoustic radiator of bending wave as claimed in claim 1, wherein, hardening component is highly basic uniformity on its length.
17. the plate shaped acoustic radiator of bending wave as claimed in claim 1, wherein, the opposite combination of a plurality of sheet planes.
18. the plate shaped acoustic radiator of bending wave as claimed in claim 17, wherein, the fold on a thin slice is angled with respect to the adjacent fold on the contiguous slices.
19. a loud speaker comprises according to the plate shaped acoustic radiator of aforesaid right requirement 1 described bending wave, and is coupled to the vibratory transducer on the sound active area of panel.
20. loud speaker as claimed in claim 19, wherein, panel is hot formed plastics.
21. loud speaker as claimed in claim 20, wherein, vibratory transducer is installed on the side of panel, and plastics form hardening component from this side shifting.
22. method of making the plate shaped acoustic radiator of bending wave, comprise that the thin slice with the plane forms panel, this panel has at least one whole fold element, this fold element extends to outside the thin slice on plane, and the part strides across thin slice at least, and be roughly U-shaped cross-section, make the planar section of this thin slice keep, have the desirable ability that can support and propagate bending wave so that thin slice hardened into; And this acoustic radiator constitutes by the thin slice of a fold or by the thin slice of a plurality of fold.
23. method as claimed in claim 22 is characterized in that, comprises arranging at least one hardening component, so that the sclerosis thin slice supports the ideal frequency of standing wave in panel to distribute.
24., it is characterized in that as claim 22 or 23 described methods, comprise thin slice formed to have one or more edges or other parts, be used for acoustic radiator being connected or supporting to framework or other bracing or strutting arrangements.
25. method as claimed in claim 24 is characterized in that, comprises forming edge or other coupling parts, so that resilient suspension to be provided.
26. method as claimed in claim 26 is characterized in that, comprises forming edge or other parts, so that following device to be provided, can retrain the sound active area of thin slice basically by this device.
27., it is characterized in that, comprise the arrangement of selecting hardening component, so that reduce or be limited to the mean free path of the line of the bending reduction in the sound active area of thin slice as claim 22 or 23 described methods.
28. method as claimed in claim 22 is characterized in that, comprises stacked to combination with the fold thin slice.
29. method as claimed in claim 28, wherein, stacked thin slice passes through solder bond.
30. method as claimed in claim 29, it is characterized in that, comprise and on thin slice, want surface-coated thermoplastic welded together, the fusing point of this thermoplastic is lower than the fusing point of sheeting, thin slice formed face-to-face contact and heating sheet so that the fusing coating, thereby thin slice is fused to together.
31. as each described method in the claim 28 to 30, it is characterized in that, comprise this is arranged to respect to angled to the fold on another of thin slice at this fold in the thin slice one.
32. method as claimed in claim 24 is characterized in that, comprises the acoustic radiator that manufacturing is made of described thin slice or a plurality of thin slice.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0107314A GB0107314D0 (en) | 2001-03-23 | 2001-03-23 | Bending wave acoustic radiator |
| GB0107314.7 | 2001-03-23 | ||
| GB0130469.0 | 2001-12-20 | ||
| GB0130469A GB0130469D0 (en) | 2001-12-20 | 2001-12-20 | Bending wave acoustic radiator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1625918A CN1625918A (en) | 2005-06-08 |
| CN100551133C true CN100551133C (en) | 2009-10-14 |
Family
ID=26245888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028068688A Expired - Fee Related CN100551133C (en) | 2001-03-23 | 2002-03-13 | Bending wave acoustic radiator |
Country Status (6)
| Country | Link |
|---|---|
| CN (1) | CN100551133C (en) |
| AU (1) | AU2002238709A1 (en) |
| GB (1) | GB2386790B (en) |
| HK (1) | HK1055655A1 (en) |
| TW (1) | TW527846B (en) |
| WO (1) | WO2002078391A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107409257A (en) * | 2015-01-23 | 2017-11-28 | 构造音频实验室有限责任公司 | Audio-frequency transducer systems stabilisation and method |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101145494B1 (en) | 2004-04-16 | 2012-05-15 | 하이웨이브 테크놀러지스 (유케이) 리미티드 | Acoustic device and method of making acoustic device |
| CN1882198B (en) * | 2006-04-30 | 2012-06-13 | 南京大学 | Method for designing sound pressure frequency response curve of drive location optimization bending vibration type thin plate loudspeaker |
| EP1988740A1 (en) | 2007-05-03 | 2008-11-05 | Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO | Sound generator |
| DE102011015747A1 (en) * | 2011-03-31 | 2012-10-04 | Airbus Operations Gmbh | Active acoustic element e.g. flat speaker, for use in cabin lining of e.g. aircraft, has plate-like element producing sound waves, partially made of foamed glass ceramic material and exhibiting three-dimensional surface structure |
| US9628917B2 (en) * | 2014-07-23 | 2017-04-18 | Bose Corporation | Sound producing system |
| GB2539029B (en) * | 2015-06-04 | 2017-06-07 | Amina Tech Ltd | Distributed mode loudspeaker damping oscillations within exciter feet |
| GB2586959B (en) * | 2019-08-08 | 2021-10-13 | Amina Tech Limited | Distributed mode loudspeaker |
| KR20220091082A (en) | 2020-12-23 | 2022-06-30 | 엘지디스플레이 주식회사 | Sound generating module and vehicle comprising the same |
| GB202217215D0 (en) * | 2022-11-17 | 2023-01-04 | Amina Tech Limited | distributed mode flat panel loudspeaker with overhanging monolithic panel and method of installation thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9704486D0 (en) * | 1997-03-04 | 1997-04-23 | New Transducers Ltd | Acoustic devices etc |
| GB9822246D0 (en) * | 1998-10-13 | 1998-12-09 | New Transducers Ltd | Loudspeakers |
| GB9911271D0 (en) * | 1999-05-15 | 1999-07-14 | New Transducers Ltd | Acoustic device |
| GB9913465D0 (en) * | 1999-06-10 | 1999-08-11 | New Transducers Ltd | Acoustic device |
-
2002
- 2002-03-13 CN CNB028068688A patent/CN100551133C/en not_active Expired - Fee Related
- 2002-03-13 WO PCT/GB2002/000993 patent/WO2002078391A2/en not_active Application Discontinuation
- 2002-03-13 GB GB0316845A patent/GB2386790B/en not_active Expired - Fee Related
- 2002-03-13 AU AU2002238709A patent/AU2002238709A1/en not_active Abandoned
- 2002-03-21 TW TW91105475A patent/TW527846B/en not_active IP Right Cessation
-
2003
- 2003-10-30 HK HK03107835A patent/HK1055655A1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107409257A (en) * | 2015-01-23 | 2017-11-28 | 构造音频实验室有限责任公司 | Audio-frequency transducer systems stabilisation and method |
| CN107409257B (en) * | 2015-01-23 | 2020-01-24 | 构造音频实验室有限责任公司 | Audio transducer stabilization system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2386790B (en) | 2004-08-18 |
| HK1055655A1 (en) | 2004-01-16 |
| WO2002078391A2 (en) | 2002-10-03 |
| GB0316845D0 (en) | 2003-08-20 |
| AU2002238709A1 (en) | 2002-10-08 |
| CN1625918A (en) | 2005-06-08 |
| GB2386790A (en) | 2003-09-24 |
| AU2002238709A8 (en) | 2008-01-03 |
| WO2002078391A3 (en) | 2007-10-25 |
| TW527846B (en) | 2003-04-11 |
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| SE01 | Entry into force of request for substantive examination | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091014 Termination date: 20130313 |