TW543332B - Loudspeaker and method of making same - Google Patents

Abstract

A loudspeaker includes an assembly of at least two bending wave panel-form acoustic members (82, 84) each having a set of modes which are distributed in frequency, the parameters of at least two of the acoustic members (82, 84) being selected so that the model distributions of each acoustic member are substantially different and the arrangement being such that the modal distributions of the assembly of acoustic members are interleaved constructively in frequency, and transducer means (88) to apply bending wave energy to the acoustic members to cause them to resonate to produce an acoustic output. A method of making such a loudspeaker.

Description

543332 A7 B7 V. Description of the invention (1) ^ ^ The present invention relates to speakers, and more specifically to the general type of resonant bending wave speakers described in our international patent application WO97 / 09842, this international application The case describes a new type of so-called distributed mode speaker (DML) speaker. Background Art It is known from international application WO 97/09846 to provide a loudspeaker comprising two separately driven boards. The first board is smaller, and the first board is designed to operate at a higher frequency than the large second board. The first board is suspended in the second board, and the frequency ranges of the boards may overlap at the middle range. A cross-over network may be added to control any output in the overlapping frequency range. A loudspeaker is known from International Application No. W098 / 52381, which loudspeaker comprises a larger low-frequency board and a smaller higher-frequency board, both of which are excited by a common driver. Smaller and larger boards can be attached together by a material that forms a controlled elastic coupling, thereby distinguishing the high and low frequency portions of the speaker. According to a first aspect of the present invention, a loudspeaker is provided. The loudspeaker includes an assembly of at least two curved wave plate sound members, each sound member has a group of modes in a frequency distribution, and at least two sound members are selected. Parameters so that the mode distribution of each acoustic component is significantly different, and its configuration can make the mode distribution of the acoustic component assembly present a constructive stagger at frequency; and a transducer device, whereby bending wave energy is applied to the acoustic component to cause its resonance to generate One beep. -4- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 543332 A7 ----------- ^ V. Description of the invention (2) Hunting for constructive staggered acoustic components Compared with the mode distribution of any individual acoustic component, the overall mode distribution of the speaker is denser, that is, it has more modes in the known frequency range. Therefore, unlike conventional techniques, the acoustic components are designed to cover approximately overlapping or approximately the same frequency range, rather than different frequency ranges that may partially overlap in the middle range (ie, about 1 or 2 仟 Hz). . The contention of the 'mode distribution' may be constructively staggered, so that the modes in the overall mode distribution of the assembly are more evenly distributed at a frequency than the modes of any individual acoustic component, so the individual sounds can be significantly reduced in the overall distribution. Any of the patterns that can occur in the component, 'bunching,' or clustering, the patterns in the pattern distribution of the assembly may be approximately evenly distributed with frequency. These methods can be used to enhance the overall output of the speaker and achieve a smoother frequency response. The acoustic components may have different areas or shapes, so that each acoustic component has a different pattern distribution as required. Alternatively, different mode distributions can be achieved by using acoustic components with different mechanical parameters (i.e., parameters such as bending stiffness, damping, mass per unit area, or Young's modulus). At least two acoustic members can be coupled together by a coupling device, so bending wave energy can be transmitted between the acoustic members. Therefore, the acoustic component can be mechanically and acoustically coupled by the coupling device. In this way, only one transducer needs to be attached to one side, and the adjacent side may be driven by the bending wave energy transmitted through the coupling device. Therefore, the complex mechanical and acoustic interactions between the acoustic components in the assembly may be encouraged, and the incentive to increase the available modes in each component 'is especially used when some acoustic components are not actively excited.

V. Description of the invention 3 The assembly of the acoustic component may be made of a single piece of early hard rigid light weight material ... r ^, 丨 丨 w, soil diameter 材料 I material piece = This should greatly simplify Process and assembly. Or, this assembly is made of rigid light-weight materials and materials, and the material is oblique A π 6 kg. It is composed of several separate acoustic components. The material is rigidly constructed, and the device may be engaged. It has sufficient flexibility: the flexible coupling device may be made of continuous or discontinuous early films-the assembly is a coupling device may be made of a piece of material ^ one material or less- . The double-sided "larger decoupling" can shape the material piece into a groove, and the groove may include local compression of the material piece. For an assembly made of separate components, the M-coupling device Possible package = component 'The coupling component may include a hinge portion so that the acoustic components can move with each other. The assembly of the acoustic component in the package flat can be a stereo or box speaker to define a volume; T can have any suitable Geometry, such as a tetrahedron; and may be opened or closed in different orientations of the component. This assembly may include a f-plane and sides and may be configured, for example, between a pair of opposite rear faces; a rear opening, at least One or two acoustic members may be approximately triangular, the assembly may form a truncated angle I, and the truncated plane may appear oblique to the plane at the bottom of the pyramid, such as 20 °. Alternatively, the acoustic member may be configured as Located approximately on the same plane, the acoustic components may be plate-shaped and flat or curved in one or more planes. For curved plates, the plate can be arranged on the same surface of a rotating volume. The piece may be used as a baffle for an adjacent acoustic component, and may be partially or completely filled with foam or other known acoustic treatments, such as 543332 A7 B7. 5. Description of the invention (4) into a defined volume In order to improve the baffle effect, the transducer device may include an inertial or ground vibration transducer, which may be a moving coil inertial exciter, which includes a magnet assembly and-^ Coil assembly, a piezoelectric transducer, a magnetostrictive transducer, a curved or twisted transducer (such as the type disclosed in WOOO / 13464) or a distributed mode transducer (such as W001 / 54450 Type disclosed). Especially for folding speakers, the transducer is preferably inertial. As disclosed in International Application Nos. WO97 / 09859, W098 / 31188 or W098 / 52383, the transducer may be mounted to the acoustic member. It is possible to design the transducer and especially the low frequency transducer to have a lower fundamental suspension resonance than the low frequency range required by the loudspeaker, and a filter can be used to prevent the lower limit of the transducer from falling below its fundamental resonance. It may be a moving coil inertial exciter, which includes a magnet assembly and a voice coil assembly. If the transducer is installed on a sloped surface, it will have an uneven weight load and cause a bad non-axis of the magnet assembly Direction, therefore, the magnet assembly may be supported in a transducer housing, which is mounted to the acoustic member, and the housing may be a plastic central disc that decouples the mass of the transducer from the acoustic member The transducer housing prevents undesirable non-axial movement of the magnet assembly, thus reducing damage to the voice coil and limiting the deviation of the transducer. The transducer device may include attachment to each The separate vibration transducers of the acoustic components can obtain stereo sound sources from a single object by placing the transducers on more than one side. A transducer may be installed on each side of the box structure to improve the high-frequency Unidirectional. This paper size is applicable to China National Standard (CNS) A4 specification (210 X 297 mm). 5 V. Description of the invention It is possible to use different transducers for different frequency ranges, which should be connected by a crossover (Cna. Call to connect These different transducers, for example, the first-order low-pass bridge of the ϋ :? device. The converter can include-the first; the sequence: the standby state, the first-order sequence capacitor has a selection in which The overall output of the speaker is weak-one of the frequency and the resonance of the serial inductor, to provide amplification in the controlled frequency band. A passive second-order high-pass filter can be used to limit the signal (band_limlting) to protect the switching Energy converter, e can also be used to make the knee point of the transducer "vibrate" to get the bass amplification, and the compensation is expected-bipolar gradient roll or other bass value loss. You can also use the modified amplifier transfer function to The bass value is amplified. The hard and light weight material may be a corrugated board or the like, the tile board may be a skin with a sandwich-corrugated core, and the assembly may have an attached-bottom front, and At least one has a bottom side and the corrugated core may have its corrugated portion extending perpendicular to the bottom in the front and / or its corrugated portion at an acute angle with its bottom in the side. Alternatively, a rigid, lightweight piece of material may It is a vacuum-formed plastic or extruded double-walled polypropylene sheet, such as roughly equivalent to corrugated cardboard and sold under the Correx trademark. So these materials can be made extremely lightweight, portable, low-cost and May be disposable speakers. Alternatively, more durable, long-lasting, or higher-performance pieces of material may be used, such as the seller under the "Traumalite" trademark. Each speaker may have a bottom and may define a Closed box, the speaker may be suspended on the floor and the bottom may be a radiating acoustic component. Or -8-This paper size applies to China National Standard (CNS) A4 specifications (210 X 207 mm 543332 V. Description of the invention (6 The bottom of the speaker may be defined by Yang Jian crying on the base and the f surface, and the speaker may be tied to the feet or the acoustic component itself == the bottom edge of each acoustic component or separated The surname is from the foam or rubber strip on the extension. Or the hanging part of the sound member may be a rubber strip, combined with the sound Lidu 7 foam, 帛, or oak. "A surface of the cow < A foam or rubber strip, or a dagger, or a “molded” molding, etc. < According to another aspect of the present invention, there is provided a system for bending wave plate type speakers. : Select at least two curved wave-shaped acoustic components, each f, leather ==-group mode with frequency distribution, 丄 = :: system is significantly different, and the acoustic component makes the acoustic component assembly = knife cloth with frequency Constructive interleaving is presented, and the transducer device is coupled to this assembly to apply bending wave energy to the acoustic member to resonate to produce an acoustic output. The dagger method may include an assembly that manufactures the acoustic structure from a single piece of rigid light-weight material. The acoustic component may be defined by a single piece of material, such as by forming at least one groove in the piece of material by local compression, etc. A pair of parallel grooves may be formed, and the arrangement of the grooves may cause the sheet of material to be folded. ^ This method can include coupling at least two acoustic members together, so that the bending wave energy can be transmitted between the acoustic members, and the assembly can be flattened by this combination. The rigid fe weight material sheet may be of a type that includes a crust, and the crust inserts a corrugated core, and the assembly may be configured to define a regular surface with a bottom and at least one side with a bottom. The corrugated core may make it The corrugated portion extends perpendicularly to the bottom in the front and makes the corrugated portion at an acute angle to the bottom in the side. -9-543332 V. Description of the invention (★ The model group of each ^ component starts from the basic or the lowest mode and is defined by parameters such as the geometric structure and properties of the material including the acoustic component. Therefore, the method may include: The geometric structure, size, surface mass density, bending stiffness, internal self-damping: and anisotropy or isotropy of bending stiffness or thickness are selected in the group of objects. The lowest mode may be the largest individual The size of the acoustic component is determined. Therefore, the size of the largest acoustic component may be selected so that the output of the speaker is extended to a required low frequency limit. The lowest mode of an acoustic component may be selected so that it is lower than a coupled transducer The fundamental resonance frequency of the device, such as at least lower two or three eight f. By properly selecting the parameters, the acoustic component may have a mounting mode as low as 5 Hz and utilize a transducer with a fundamental inertial resonance of 40 Hz The fundamental resonance or complete body bending mode of a 2 member does not produce any contribution to the acoustic output, so the output may be dense in mode and at the entire frequency This method may include providing a plurality of separate transducer devices and selecting them to have different fundamental resonance frequencies. In particular, using different types of low-frequency exciters with different fundamental resonance frequencies will be possible. For the speaker to disperse the effects of these resonances. In normal operation, a transducer coupled to drive an acoustic component can harden the material of the acoustic component directly under the transducer converter, specifically, The circular area of the sound member surrounded by a voice coil of a moving coil transducer maintains a strong drum-like pattern that is inherent and maintains a neat geometry. The frequency at which this local resonance occurs has been referred to as the aperture resonance frequency and its Depends on the shape of the coupler footprint and the nature of the acoustic components. The separation can be changed for 10- This paper size applies to China National Standard (CNS) A4 (210X297 mm) 543332 A7

Fig. 28 is a plan view of a two-beam speaker; Fig. 29 is a cost function diagram for the speaker of Fig. 28 relative to α; Fig. 30 is a perspective view of a two-plate speaker; Figs. 31 and 32 are three and four Plane view of beam ring loudspeaker; Figures 3 3a and 3 3b show the pattern distribution of three and four beam ratios for Figures 3 and 3 2 respectively; Figure 3 3c shows that it is not added to the three beam ring to form a four beam ring The mode distribution of the frequency of the fourth beam; and Figures 34a to 34c show the mode distribution for three, four, and five beam circles. Demonstration Mode of Best Practice Figures 1 and 2 show the first embodiment of the present invention, in which the speaker is roughly in the form of a truncated square bottom pyramid. Figure 丨 shows the speaker in an assembled use position, and Figure 2 shows the corrugated The blanks of cardboard are folded to form speakers. & The speaker includes a front face 82, two side faces 84, and a rear face. The rear face has two sections 86 separated by a gap 90 for the speaker as a vent. Therefore, the speaker system defines a generally closed volume. A single transducer 88 is mounted to each side 84, and a pair of transducers is mounted to the front 82, so that each side forms a separately driven plate-type bending wave. Acoustic radiator or component. The rear 8 6 is passive and may become modaUy active via the aforementioned hinge coupling. To this end, the loudspeaker system comprises an assembly of five curved-wave plate-type acoustic members, of which at least three acoustic members are directly driven by the transducer to produce an acoustic output.

543332

According to the present invention, each acoustic member or surface has different shapes and sizes, so that the mode distribution of each acoustic member is substantially different and may be constructively staggered, and each of the front and side surfaces 82, 84 has a top edge with a length of 10 cm. A truncated triangle, the front 82 has a 56 cm base and a generally vertical 100 cm side. Each side surface 84 is approximately an isosceles triangle and has a base angle of about 80 degrees and a base of 47 cm in length. The rear section 86 can be formed into a substantially triangular shape, with a base of about 20 cm long and a free edge of about 100 cm. As shown in the figure, the speaker of FIG. 1 does not have parallel surfaces or edges. Therefore, it should be possible to suppress the sound coloration (c0urati) from standing waves inside the speaker. In addition, compared to the single-plate type acoustic components, each acoustic component is placed in a different orientation, which increases the complexity of the interaction between the speaker, the environment and the audience. Therefore, the priority stimulus of individual standing waves in the room, and, most effectively, the listening point can be removed or reduced. "In all embodiments, the position of the transducer can be selected so as to be approximately evenly coupled to the resonance% wave mode, which is easy. In other words, the transducer may be located at one of a larger number of active resonance antinodes and a smaller number of resonance nodes. In this embodiment, the transducers 8 and 8 are positioned on the front and the bottom respectively. 90 cm and 30 cm apart and 4 cm and 30 cm apart to achieve the above-mentioned effect. The transducers 8 and 8 are mounted to the side by joining the vertical side to the front side. The distance from the generally vertical side is 16 cm and the bottom of the side is 40 cm. The transducer on the other side is installed 18 cm from the front slope surface and 2 5 from the bottom of the side Common Office. -13- The paper size is suitable for the financial country standard (CNS) A4 specification (210X297) —— " — --- 543332 A7 B7 V. Description of the invention (11) The back 8 6 series control side 8 4 after Edge action, back increase Effective trap size for improved bass response. The shape of the bezel can be adjusted to suit different room sizes or acoustic needs. Alternative bezel configurations are shown in Figures 3 and 4 'One of the speakers includes a truncated triangle front 82 and two A two-sided side surface 8 4. The front surface 8 2 is driven by a transducer (not shown), and the side surface 8 4 serves as a baffle. The rear edge of the side surface defines a gap, which can be regarded as an open back 9 2, 9 4. Figure 3 shows a generally closed baffle, in which the rear edges of the sides almost meet. Therefore, the open rear 9 2 is smaller, and the lower edges of each side and the lower edge of the 5th side are in a Acute angle α. Figure 4 shows a generally open baffle, where the open back 9 4 is larger and the lower edge of each side and the lower edge of the front have an obtuse angle Θ, which generally has a larger bass weight than the open baffle. Figure 5 shows a loudspeaker 2 2 ′ which is approximately similar to FIG. 3 and is installed near a wall 24. Since the side 8 4 adjacent to the wall 24 is at an angle to the wall, the radiation reflected by the wall 2 4 is homogeneous. The system was destroyed to provide low room sound Advantages of better stereo focusing. Off-axis light shots from other sides and fronts also help destroy reflections. The speakers sit on a carpeted floor and define the lower edge or bottom of all acoustic components. End conditions, which will increase the length of the shortest leaking sound path and may effectively double the size of the baffle. Figures 1 to 5 show the speaker, where the assembly of the acoustic component defines a volume. Alternatively, the acoustic component may be roughly arranged at The same plane as shown in Figures 6 to 〇. In Figure 6, the assembly of the acoustic member 26 forms a pile, which may have -14- This paper size applies to the Chinese National Standard (CNS) A4 specification (210X 297 (Public Director) 543332 The invention describes a geometric order or pseudo-random and where components may be separated or connected. In FIG. 7, the “assembly” includes a large acoustic component 30, and the acoustic component 30 has a larger low-frequency transducer 32 and a smaller acoustic component 3 4, and a smaller mid / high frequency. The transducer 3 6 is mounted to this smaller acoustic member 3 4. The large truncated triangular member 30 is partially surrounding the smaller triangular member 34, it is possible to use a smaller member and it is possible to configure the large member 30 to completely or partially surround each of the smaller members 34. In FIG. 8, the assembly system includes a front triangular acoustic member 40, and the front triangular acoustic member 40 is installed above a rear triangular acoustic member 44 at an angle to each other so that the rear triangular acoustic member 44 receives the front member. 40 is partially shielded, and this angle is suitable for completely shielding the rear member 44. The front acoustic member 40 is driven by a transducer 42, and the rear acoustic member 44 may be actively driven by its own transducer (not shown), or an acoustic adapter 46 may be passively driven from the front acoustic member 40. drive. It is preferred to couple this, for example one or more pin-shaped couplers, to the component where a high-speed action in the main mode is found. The pin 46 may also serve as a mass, affecting the pattern in one or two members in a known manner. Referring to FIG. 9 ', the speaker includes an assembly of flat triangular plate 100, 102, and 104 sound members. The flat triangular plate 100, 102, and 104 are arranged on the same plane and inlaid. A composite super board is formed, and the transducers 108 and 110 are mounted to two larger boards, such as boards 100 and 104, so that boards 100 and 104 become active and the smallest boards. 10 is passive. Figure 10a shows acoustic components in the form of panels 120, 122, 124, and 126. The panels 1 2 0, 1 2 2, 1 2 4, 1 2 6 are pasted into an irregular or skewed Maltese cross 128 ' The cross-shaped center at the off-center will be a -15- This paper size applies to China National Standards (CNS) A4 specifications (210X 297 mm)

Binding

k 543332 A7 B7 V. Description of the invention (13) Replacement of theft 1 0 0 0 Installed to this assembly. In Fig. 10b, this assembly comprises a single active isosceles dihedral plate i 4 0 driven by a transducer i 50 and three smaller passive coupling plates i 4 2, M 4 and 146. The plates 142 and 144 are rectangular meniscuses coupled along their hypotenuses, and the plates 140 are rectangular. The plates are held together in a single plane by the low shear strength joint 152 (see Fig. 17). A mass load 148 is added to an originally identical passive right triangle to change its modality relative to the others, and further increase the overall speaker's modal complexity. As shown in FIG. 10c, the single board is subdivided by removing the material generating grooves 222, 224 to form a separate sound member with a hard connection portion 2 2 0, 8 2 and 8 2 therebetween, These slots may be open end slots 2 2 2 or closed slots 2 2 4. The sound members or surfaces of the stereo speakers of Figs. 1 to 5 are preferably connected by a coupling device that can move the sound members relative to each other. Therefore, the coupling device may be a hinge of the type shown in Figs. 11 to 16. In Figures 11 to 14 ^, the hinge is integrated with the face, so adjacent faces may be made of a single piece of material. Figure 15 & and the hinge is a separate member connected to both sides, so both sides can be made of separate pieces of material. , = Shengzhai may be made of a foldable material, such as a core with a can. Single body (monolth) or with leather plate. Figures 11 and 12 show the hinges that may be folded from these materials. Figure 11 shows a single hinge 5 0 used to connect the two sides 4 unconnected. The hinge 50 includes the cutout 5 and the cutout of the folding door. Or opening 5 6. Figure i 2 shows a paper sheet with -16- between two sides of $ 2 (21 × 297 mm) _ 543332

And may be used for thicker drum keys such as cardboard. If this surface is not made of a foldable material, a hinge can be provided with a V-shaped groove as shown in Figures i3a and 1 3b. Figures 3a and 3b show the hinges in the open and closed states. It is made of a composite panel which includes a core 60 sandwiched between two skins 62. A v-shaped section (including a skin) of the core is cut off. The v-shaped points define the fulcrum 66 where the faces can rotate relative to each other. Rotate to a position where the two faces are perpendicular to each other (Figure i3b). Reinforcement straps 64 are added along the sides of the plate in the groove area, and the reinforcement straps pass through the inside of the closed hinge. The reinforcing tape 6 can be replaced by any suitable alternative such as an adhesive. Fig. 1 4a, 1 4b shows a double hinge. The double hinge system contains two Vs shown in Figs. 1a, 1 and 3b. The grooves therefore have the same number, and in the directions of the arrows C and D, each face is rotated from a position where the two faces are on one of the same planes to a position where the two faces are parallel but not coplanar, thereby achieving 18 °. fold. Figures 15a and 15b show two sides 5 2 which are separated to define a gap approximately equal to the thickness of each side and connected by a self-adhesive tape 68 forming a hinge. One side can be rotated in the direction of arrow B from a position where the two sides are on the same plane (Fig. 15a) to a position where the two sides are perpendicular to each other (Fig. 15b). The self-adhesive tape is selected to have a high internal damping and an appropriate southern adhesive. If this surface is made of a cut core, the self-adhesive tape can prevent the squeaking of the edges of the meal. The hinge may be flexible enough to flatten the speaker, and the flexibility of the hinge may be from a degree of resistance to deflection to a degree of complete flexibility. L_ -17- This paper size applies to China National Standard (CNS) A4 (210 X 297 public love) 543332 A7

As the side is completely flexible, this hinge system serves as a simple supporting edge terminal for an excited plate and little or no bending waves can be transmitted through the hinge. Or, if the hinge can resist deflection, that is, it has residual bending stiffness after being folded, then the bending wave violates "and encourages the surface to transmit through the hinge to an adjacent surface. Although there may be losses as the frequency increases, it may be possible to design the hinge to transmit bending wave energy at all frequencies within the operating range, that is, at least as high as 20 Hz. Figure 16 shows that the curved wave energy system is transmitted from a driven surface 76 through a hinge to an adjacent surface 78. The curved wave energy system in the driven surface causes a rotational pivot along one of the longitudinal axes of the hinge 80. (Arrow 〇), the hinge 80 drives the bending wave energy into the adjacent surface 78, and the bending wave system from the driven surface 76 reaches the suture 80 as a partial lateral angular displacement. The equal partial lateral angular displacement is converted into a displacement of relative polarity in the adjacent surface 7 8. The displacement of the relative polarity has an angle equal to and opposite to the original position and the area mass (surface mass) of the surface 7 8 The degree and inertia drive the bending waves into the Xiangzheng surface 78. As shown by arrows E and F showing the directions of the local bending wave vibration in the driven surface 76 and the adjacent surface 78, respectively, the adjacent surface 78 is excited with the anti-phase of the driven surface 76. Conversely, the acoustic components of the flat speakers of Figs. 7, 9, 10a, and 10b are preferably formed by a coupling device that can form a self-supporting plate having a stable size, possibly with a frame or supported, like a single plate. At the same time, the coupling device or joint should have low shear strength so that the acoustic member or plate in the assembly maintains its own bending wave mode independently of its neighbors. In Figures 17 and 18, the two plate-shaped sound members 16 0 and 16 2 are placed next to each other with their near edges separated by 1 mm to 2 mm. The engaging device is An-18- This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 543332 A7 B7 V. Description of the invention (16) The form of the high-tension film 164 mounted on the front and back surfaces of the two plates, the film has a size of less than 200 microns Thickness and modulus of tension in a plane greater than 1 GPa. As shown by the arrows 16 8 and 169, the bending action of the adjacent edges of the plates 16 0 and 16 2 is anti-phase. In Figures 17 and 18, the space 1 6 6 enclosed between the edge of the plate and the membrane is filled with air or an alternative filler 17 0. By properly selecting the filler, the joint can resist the relative rotation and lateral crushing of the plates (that is, the gap between the closed plates), but has near-zero shear strength. The filling may be another gas, a liquid, or a flexible foam, or a fibrous substance that may also add damping to the joint or stiffness that changes with frequency. In Figs. 19 and 20, the coupling device is a double-sided self-adhesive foam plastic tape 1 7 6 which is bonded to adjacent edges 172, 174 of the plates 160, 162. This joint has a significantly lower shear strength. Compression in the plane of the plates, lateral compression as shown in Fig. 20, can cause the plates to have some degree of rotation relative to each other. The foam 1 70 may be an open or closed cell and the foam joints produced may be reinforced by a band on one or both sides of the board. The band should be flexible (such as P · V. C · τ ), So it can move sideways in the direction of arrow 178. This structure may be effective for automotive applications (especially after-sales products), custom installation or architectural presentation. As shown in FIG. 21, the coupling device 1 8 4 is located in a separated position and locks the acoustic member or plate 180, 182 in a fixed overall geometry while still having independent bending mode vibration. The coupling device is a fully rigid joint and may be shown in Figs. In Fig. 22, the joint system includes a substantially rigid rib 丨 8 6 and the rib ^ 丨 8 6 crosses -19 ·

543332 A7 B7 V. Description of the invention (17) Bonded to the surfaces of the plates 182 and 182 through a gap. In Fig. 23, the joint includes a block of 1 8 8 hard cement or other similar material. In Fig. 24, a roughly rigid pin 190 is located in the hole 9 2 of the edge surface 9 4 of each of the plates 8 2 and 8 2. In Fig. 25, the plates 1 800 and i 8 2 have a composite structure including a core 2 0 sandwiched between the skin 2 0 2 and the joint portion includes a substantially rigid rod 2 0 4 2 0 4 is located in a recess 206 which is cut into the core 2000 of the edge surface of each plate. FIG. 26 shows that one of the nuts and bolts 214, 212 located between the collars 210 is provided with the clamping plates 18, 182. Fig. 2a shows the pattern distributions for large triangular plate-shaped acoustic members and a similarly shaped acoustic member reduced by 50%, 70 and 72, respectively. Figure 27b shows the pattern distributions 70, 74 for the same large acoustic component and a similarly shaped acoustic component that is reduced by 20%, respectively. Because these components have similar shapes, the patterns in each distribution have the same relative spacing. However, for larger acoustic components (the distribution is significantly the same as the smaller components, they are more evenly distributed and extend to lower frequencies. As shown in the figure, the patterns are structurally staggered with frequency. It may be shown in Figure 28. Two beams 14, 16 with lengths L1 & L2 have developed a way to improve the overall pattern distribution in a simple case where one end is joined together. The contact 18 is rigid and is assumed to meet the boundary conditions of a simple support. Any bending wave energy transmission system around the contact uses rotation. The mode frequency of this simple case is one of the basic intervals set by the combined length. Interval: the difference between the two length ratios (also defined as L1: LW size ratio α) The actual interval at which the frequency is modulated is determined by one of the determined speeds. Figure 29 shows the decision from the calculated mode frequency for this simple speaker.

M3332 A7

= Take the best size ratio (two_, Figure-20 shows the cost function ed (also the central difference of the mode frequency) phase '/,) relative to the size ratio, the valley in the figure represents: ruler: ratio; The second figure 25 shows "the derivative function with respect to α, the figure: the second and fifth troughs represent good size ratio values. It can be seen that the optimal size ratio is 1134, which is ν (9 / 7), for i ^ is the heart) and the size ratio of ι · 76 also obtained good results. The cost function cannot be defined as follows: cd (n, N, a) > r ^-ξηίη, α! For meO " N cf < ~ 0

f〇 「rnel」 NM

Cf cf + ⑷one ten fm + 1 one 2.fm i2

pL

Jn-i, where fm is the mode frequency, and r is a length vector in an appropriate ratio (1: a: a2: aN) with a total length of 1. And X is a function that returns Γ to the function of η (the number of beams) and α. Because the cost function is the central difference of the measurement modes, it indicates the pattern distribution for the Zhao rate. For this reason, when the cost function is minimized, the patterns are more evenly distributed at the rate, that is, any of the patterns are reduced, ^ (bunching), or clusters. Available from W099 / 56497 for the cost function combination. An alternative equivalent is: '

Hast (/)-3 ⑺ · 'lasT \ -21-This paper size applies to China National Standard (CNS) A4 (210X297 mm) — ------ 543332 A7 B7 V. Description of the invention (19) Yes The results are extended to the two rectangular plates 21, 23 shown in FIG. 30, because these two plates can be regarded as a series of beams. The two plates have the same height Η and lengths L1 and L2. Set the two beams to lengths li and [2, that is, α = V (9/7) and calculate a cost function as above. The optimal ratio for wide plates is also λ / (9/7). Therefore, the size ratio of L 丨: l 2: Η is equal to 1: V (9/7): 9/7. This result can also be extended to one circle of the η beam 2 8 and therefore also to a speaker with an η plate, where η is at least 3 and the beam has a length ratio determined by 1: α: ^:. The loop system of three or four beams 28 is shown in Figures 3 1 and 3 2 'The following cost function is plotted for α of a loop with three beams, and good alpha values are 1.1 to 1.2 and 1.4 to 1 · 5 range. Figures 33a and 33b show the frequency divisions for the frequencies of the three and four beam circles of Figs. 31 and 32, respectively. The longest beam system in each circle has a unit length, so the two circle systems have the same minimum that occurs at approximately 10 Hz mode. In the frequency range of 10 to 50 Hz, the three and four beam coils have 8 and 20 modes, respectively. Therefore, by adding an extra turn, the number of modes in a known bandwidth will increase 'so the density of the mode distribution will also increase. And, especially below 200 Hz, the patterns are more evenly distributed at the frequency. Figure 3 3c shows the mode distribution of the frequency of the fourth beam added to the three-beam circle to form the four-beam beam. The mode distribution of the fourth beam is significantly different from the three-beam circle, that is, the merged mode occurs at the same frequency. The pattern distribution of the fourth beam and the three beam circles both overlap each other because they have patterns in the illustrated frequency range (that is, 20 Hz to 5500 Hz). As shown in the figure, the mode distribution of the four beam circles is not the sum of the pattern groups for the two beam circles and the fourth beam. -22- 543332 A7 B7 V. Description of the invention (20) Figures 34a to 34c show the pattern distribution of three, four and five beam circles, where the overall length of the circle is fixed to the unit length. The size of the largest beam therefore decreases as the number of beams increases, as shown in Figures 3 4a to 3 4c. The lowest modes occur at the eigenvalues of 9.5, 13 and 14 for three, four and five beam circles, respectively. value. Because the frequency of the occurrence mode is proportional to the square of the eigenvalue, the lowest mode of the beam reduces the frequency, so as the maximum beam size increases, the lower frequency limit of the frequency of the loudspeaker increases, because in all cases the same The combined dimensions of the circles' have the same pattern spacing in each figure. Although the above disclosure is about board size, similar results can be obtained by changing other board parameters, with the goal of generating an optimized base model ratio for the board. If there is the same material and thickness, the ratio of the modes is just the square of the length ratio. Therefore, the best basic frequency ratio for the simple two-naked or two-plate case is 1: 9/7 and for the η beam is ^ / 7. 'This effect can be achieved by changing any parameter or related parameters, including isotropic or anisotropic bending stiffness or thickness. -23 · This paper is taken from Guanzhong® National Standard (CNS) A4 specification (210> < 297 mm) ----------- 543332 A7 B7 V. Description of the invention (21) Numbering table 14, 16 beam 18 contact 20 Cost function relative to size ratio 21, 23 Rectangular plate 22 Speaker 24 Wall 25 Derivative function of cost function relative to size ratio 26 Acoustic member 28 Coil of η beam 30 Large acoustic member 32 Low-frequency transducer 34 Small acoustic Element 36 Mid-high frequency transducer k 40 Front triangular acoustic element 42 Transducer 44 ^ Rear triangular acoustic element 46 Acoustic coupler / pin 50 Discontinuous hinge 52 Surface 54 Fold 56 Cutout or opening 58 Double Fold 60 Core 62 Leather 64 reinforced belt 66 fulcrum -24- This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 543332 A7 B7 V. Description of the invention (22) 68 Self-adhesive tape 70 For a large board pattern distribution 72 For Pattern distribution of a 50% reduced plate 74 Pattern distribution of a 20% reduced plate 76 driven surface 78 adjacent surface 80 hinge 82 front 84 side 86 rear segment / rear 88 transducer 90 gap 92 rear 94 rear 100,102,104Angle plate 106 Composite super plate 108, 110 Transducer 120, 122, 124, 126 Plate 128 Maltese cross 130 Transducer 140 Isosceles triangle plate 142, 144, 146 Smaller passive cake plate 148 Mass load 150 Transducer 152 Low shear strength joint 160, 162 Plate-shaped acoustic member 164 Still tension film 166 Space-25- This paper size applies to Chinese National Standard (CNS) A4 specification (210 X 297 mm) 543332 A7 B7 V. Description of the invention (23) 168,169 Arrow 170 Filler / foam 172,174 Adjacent edges 176 Self-adhesive foam plastic band 178 Arrow 180/182 Acoustic member / plate 184 Coupling device 186 Rib 188 Gel lump 190 Pin 192 Hole 194 Edge surface 200 Core 202 Leather 204 Rigid rod 206 Recess 210 Washer 214,212 Nut and bolt 220 Hard Connecting section 222,224 slot -26- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Claims (1)

543332 A BCD, patent application scope l A% acoustic device, which includes at least two curved wave plate-shaped acoustic components-the assembly 'each of these acoustic components has a set of modes with frequency distribution, select at least two of the The parameters of the isosonic components make the modes of each acoustic component significantly different and their configuration can make the mode distribution of the acoustic component assembly constructively staggered with a dance rate, and the transducer device applies bending wave energy to the The isophonic component causes its resonance to produce an acoustic output. 2. The loudspeaker components of item 1 in the scope of the patent application are coupled together by a coupling device between the acoustic components. 3. The loudspeaker of item 2 in the scope of patent application is made of a single piece of rigid, lightweight material. 4. The speaker according to item 3 of the patent application, formed by at least one fold in the sheet of material. 5. The speaker according to item 4 of the patent application, wherein the fold between at least two adjacent sound members includes a Pair of parallel folds. 6. The speaker 2 as claimed in item 4 or 5 of the patent application, wherein the folds are formed by grooving the sheet. 7. The loudspeaker according to item 6 of the patent application, wherein the setting groove includes locally compressing the sheet of material. 8 ·: The speaker of the scope of patent application No. 2, wherein the coupling device has sufficient flexibility to be able to flatly construct the assembly. I = "CL" of the 1st or 2nd item of the profit range, where the sound is proximate = a plurality of separate sound components made of "hard light weight material". Among them, the at least two sounds allow the bending wave energy to be transmitted to the wheel%. Wherein the sound component assembly is the coupling device system package total -27 543332-A8 B8 C8 -------- D8 t, The scope of the patent application '~ 一-一 &quot; &quot; ^ 10 · If 2 the speaker of the patent scope item 9 is attached, when it is attached to the patent scope scope item 2, the coupling device includes a coupling member. U. The loudspeaker according to item 2 of the patent application, wherein the coupling device is discontinuous. 12. The loudspeaker according to item i of the patent application scope, comprising acoustic members having different areas. As claimed in the patent scope of the first speaker, it includes sound members with different shapes. It is considered that the loudspeaker of the above item} in the scope of patent application includes sound components with different mechanical parameters. 15. As for the scope of patent application! The loudspeaker of item, wherein the acoustic component assembly defines a volume. Among them, at least one of them includes a component having a large structure, wherein the assembly is formed. For example, the speaker of the patent application No. 15 has a substantially triangular sound structure. 17. An assembly of at least two acoustic members in a triangle shape as in the case of the patent application No. 16. 18. A loudspeaker with a truncated corner, as in the case of the 17th patent application. 19. The loudspeaker according to claim 18, wherein the truncated plane is oblique to the plane of the bottom of the pyramid. 20. The loudspeaker according to item 16, 16, 17, 18, or 19 of the scope of patent application, wherein the assembly includes a front and a side, and the configuration is such that the assembly defines a rear opening. 21 · The speaker of claim 20 in the scope of patent application, wherein the assembly contains ~ -28- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) At the rear of the captain, the rear opening is defined in the 22nd of the pair if the scope of the patent application is <. Includes 4-member I% sound system, in which the transducer device is attached to each sound structure. 23. Rushen Co., Ltd. and separate vibration transducers. How to describe the description of item 15 of the patent scope _ 廿 丄 ,, The material sheet is a corrugated board, this tile board: two, eight of which: rigid light weight * _ ^ α Also the board is made of noodles and these noodles Embed the type of Bayi corrugated core. 24 ′: The loudspeaker according to item 23 of the patent, wherein the assembly defines a center and at least-side ’and wherein the 25-u series configuration in the front face makes its corrugated portion extend vertically to the bottom. The loudspeaker of the scope of the patent No. 24, wherein the at least one side surface has a-bottom 'and the foot system of the tile sections in the at least one side surface forms an acute angle with the bottom thereof. 26 · ^ The loudspeaker according to item i of the patent scope, wherein the transducer device is an inertial electric device. The inertial electric device includes a coil assembly coupled to the radiator, and an elastic suspension on the spoke. Magnet assembly. 27. —A method for manufacturing a curved wave plate type speaker, which comprises selecting at least two f-wave plate type acoustic members, each of which has a set of modes distributed in frequency such that the modes of each such acoustic member The distribution is significantly different, and the assembly of the acoustic components causes the acoustic component assembly to be structurally staggered at frequency, and a transducer device is coupled to the assembly to apply wave energy to the acoustic components to cause them to resonate. One beep. Bow / 28. If the method of the scope of patent application No. 27, its #. Put together at least two of the temple sound components so that the bending wave energy can be transmitted at -29- 543332 A B c D Six, the scope of patent application --- between. 29. The method of claim 27 or 28, which comprises manufacturing the acoustic member assembly from a single piece of rigid, lightweight material. 30. The method of claim 29, which includes defining the acoustic components by the single piece of material by forming at least one groove in the piece of material. 31. The method of claim 30, which includes forming a pair of parallel grooves between at least two adjacent acoustic members. 32. The method of claim 30, which includes configuring the grooves to fold the sheet of material. 33. The method of claim 30, which includes forming the groove by locally compressing the sheet of material. 34. The method of claim 28, which includes coupling the acoustic components together to flatten the assembly. 35. The method of claim 27 in the scope of patent application, which comprises: selecting a rigid, light-weight material as a material for the acoustic members, the material being of a type that includes a cover and the cover is embedded with a corrugated core, And the Wei assembly is configured to define a front face with a bottom and at least one side, and the corrugated core is arranged in the front face so that the corrugated portion extends perpendicular to the bottom. 36. The method of claim 35, wherein the at least one side has a bottom, and includes arranging the orientation of the corrugated portions in the at least one side at an acute angle with the bottom. 37. If you apply for the method of item No. 27 in the scope of patent application, it includes the following items: -30- This paper size applies Chinese National Standard (CNS) A4 specifications (210 X 297 public directors) 543332 A8 &quot; B8 C8 D8 The group of patent-pending objects selects the parameters of these acoustic components: geometry, size, surface mass density, bending stiffness, and internal self-damping. 38. The method of claim 27, which includes selecting the lowest mode of an acoustic component below the fundamental resonance frequency of a coupled transducer device. 39. The method of claim 27 in the scope of patent application, which includes providing a plurality of separate transducer devices and selecting the transducer devices to have different fundamental resonance frequencies. 40. The method of claim 38 or 39, which includes selecting separate transducer devices with coupler footprints of different sizes so that their respective aperture resonances are at different frequencies. -31-This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)