TW515220B - Loudspeakers - Google Patents

Abstract

A loudspeaker comprising a panel-form acoustic member intended for operation as a bending wave radiator and an electrodynamic moving coil transducer having a voice coil mounted to the acoustic member to excite bending wave vibration in the acoustic member, wherein the junction between the voice coil and the acoustic member is of sufficient length in relation to the size of the acoustic member to represent a line drive such that the acoustic member has a mechanical impedance which has a rising trend with bending wave frequency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved wave panel speaker, such as a resonant curved wave panel speaker of the kind shown in WO97 / 09842, and a drive motor for such a speaker. BACKGROUND ART When manufacturing a vibration transducer of an electric bending wave panel speaker, that is, a moving coil, the size and quality of the currently considered voice coils are oriented toward the use of a small diameter and low mass voice coil system, typically a conventional piston speaker. Ajin speaker coil size. In some applications, such as the driven bending wave panel or diaphragm shown by W098 / 39947, which is driven by the center, for example, it can be piston-type and curved-type at the same time. This small-diameter voice coil can cause power processing and Offset related issues. ^ For this small diameter + coil, the driving point impedance (Zm) is similar to a-panel driven at -single-point. When the frequency increases, the vibrations of the modal and modal structures oscillate, but they are fixed on the average & the money looks like the infinite number of panels given by:

As a result of Zm given a voice line quality (Mc), there will be a high-frequency limit (f (b)), and the rising impedance of this quality will exceed the constant driving point impedance. This frequency is as follows:

f {b) ^ VTT 2ήΜο Therefore the quality of the voice coil on a known curved wave panel is kept low according to the above formula. The obvious pattern is to increase Zm or decrease Mc to maintain the sound band. -4- Paper-like degree of towel making depends on $ M (cmS) A4 size (2 ^) 7 public goods) 515220 Λ 7 ____________ Β7 ^, description of the invention ( 2) " ^ ^ high inversion frequency. The voice coil diameter only increased slightly, and then only the cymbal unit 盍, drum mode, and resonance became dominant, causing premature stoppages. Other factors that can be detrimental to the low-quality voice coils of the piston drive panel are sensitivity and bandwidth. In order to maintain an ideal low frequency bandwidth in an ideally closed volume, the quality of the diaphragm needs to be improved. In order to maintain a high sensitivity, the B1 factor will need to be south. High Bi drivers usually increase this B 1 product based on the number of turns, and therefore increase the quality of the voice coil. The other direction is to use a bottom-mounted vibration exciter design, which increases the B 1 product according to the magnet, thereby keeping the voice coil quality low. This has been tracked using a 2.5 cm voice coil diameter with increased rigidity at this drive point. But it still limits power handling and offset. It has been known that WO97 / 09842 can provide a flat panel speaker which operates in a low frequency piston type and resonates at high frequencies. It is also known that patent us_A_ 4,532,383 provides a loudspeaker with a moving coil transducer and a diaphragm, of similar diameter, and the voice coil is configured to drive the diaphragm around it. Disclosure of the Invention According to the present invention, there is provided a loudspeaker including a panel-shaped sound component, which is to be a bending wave radiator, and an electric moving coil transducer, which has a voice coil mounted to the sound component Bending wave vibration is excited in the sound component, wherein the interface between the voice coil and the sound component has a length sufficient for the size of the sound component to represent a line driver, so that the sound component has a mechanical impedance, which The average rises at a bending wave frequency. The interface between the voice coil and the diaphragm can be a round paper. 丨〗 Towel® National Standard 41 (CNS) A4 (2) GX 297 public goods) '---- 515220 Λ 7 Β7 Fifth invention Explanation (3) " — '~-', and the junction may be substantially continuous. In this paper, the length of the voice coil interface is the diameter of the length or a circular interface, which is equal to the length of at least one bending wave in the part of the sound component defined by the interface. Or surrounded by the voice circle, and at the highest operating frequency of the speaker. The mechanical impedance of a panel is the ratio of the force applied at a single point to the speed obtained at that point. The panel is driven by a force acting on a line, and the effective mechanical impedance is the ratio of the total force exerted on the line to the resulting speed averaged over the length of the line. In this description and the scope of the patent application, the use of the term mechanical impedance is used to describe this ratio of two drive configurations. It will learn that for a one-point drive plate or diaphragm, it is only an infinite diaphragm with a stack of positive constant Zm '. A finite diaphragm has a Zm, which oscillates about the number of the typical diaphragm. Similarly, the mechanical impedance seen by a large area voice coil on the diaphragm will vibrate in a modal structure, but will rise in frequency on average. The sound component, and the part surrounded by the voice coil may have a thickness different from that of the sound component outside the voice coil. The transducer may be configured to simultaneously move the sound component ' and apply bending wave energy to the sound component in an overall body mode. The size, shape, and position of the interface between the voice coil and the sound component can be adjusted in accordance with the modal distribution of the diaphragm or sound component, so as to achieve a smooth transition from overall movement at low frequencies to higher frequencies Resonance bending wave behavior. For example, T 'is usually driven in the case of a circular diaphragm. The second resonance can be -6- this paper size is suitable for National Standard (.NS) A4 specification (210 X 297 Gong Chu) 515220 A7 ________B7 ____ V. Description of the invention (4) Increase the irregularity in the output. With a circular driving line, the effective perimeter of the driving line can be selected at a position and size to be located at or close to the node circle of the second resonance. Herein, the first resonance is an equal resonance of the whole body or the piston. By coupling or accessing the node circle of the second resonance, its effect is reduced, and the child mode is weak or not driven at all. Therefore, the designer can adjust the driving parameter to increase the second quality from the low piston frequency to the modal dense region of the middle frequency. A mass bearing can be applied to the sound component within the diameter of the voice coil. The sound component may have a non-circular shape. The transducer voice coil is in common with the geometric center of the sound component. A second transducer may be coupled to the sound component within its portion surrounded by the voice coil and used to cause high frequency bending wave activity in that portion. The second transducer may be offset from the main axis of the -voice coil. A coupling device may be used to secure the voice coil to the sound assembly, the coupling device having a non-circular footprint. The part of the sound component surrounded by the voice coil may be harder than the part of the sound component outside the voice coil. The flexural rigidity of the sound component may be anisotropic. The sound and sound component may be bent or sunken, or formed to increase its bending rigidity. The speaker may include a frame having a portion surrounding the sound component, and another portion supporting the electric dragon changer, and may further include a device connected between the sound component and the frame portion, and is flexible. The sound component is suspended from the frame. The suspension device can be connected between the frame and the margin of the sound assembly. The elastic suspension can be used to carry the sound component in mass. The meaning of this paper is suitable for Sichuan National Standard (CNS) 8-4 specifications (〇x 297 public love) 515220 Λ 7 Β7 standing, invention description (5 elastic suspension can be used to dampen the sound component. The elastic suspension can at least Partly formed by the skin of the sound radiator. The far sound component may be radiated from the front side of the sound energy, and may include a sound masking device placed on the sound component portion surrounded by the sound coil, which The cover device defines a sound cavity. The electric moving coil transducer can deviate from the geometric center of the sound component and provide an anti-balance mass on the sound component. The motion of the large area voice coil on the diaphragm can produce a The distribution of the excitation mode 'causes significant transmission on the radiation axis, at least over some frequency ranges. In some applications, such as the differentiation of the output sound, this has benefits, but in some applications, off-axis power is required. One way to improve off-axis power is to excite the panel in bending wave vibration, whose frequency is close to or greater than the coincidence frequency.-, 泫 The coincidence frequency is in the plate The speed of the curved wave is equal to the speed of sound in the air. Above this frequency, the speed in the flat plate will exceed the speed in the air, and this ultrasonic vibration will cause strong directivity off-axis radiation. In fact, at this coincident frequency When the radiation is directly off-axis, the transmission angle will move closer to the axis when the frequency increases. The coincidence frequency of a flat plate is determined by its bending stiffness (B) and mass density (mu). These The parameters can be changed so that the narrowing of the radiation pattern t caused by the large-area voice coil can be compensated at least to some extent by the extra energy transmitted by the off-axis of the bending wave vibration above the coincident frequency. The speaker of the present invention can be used As a full range device. Brief description of the drawing, Chinese National Standard (cns) Λ4 specification (21 () X 297 mm)

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-8-515220 A7 B7 V. Description of the invention (6) The present invention will be illustrated graphically using the examples in the drawings, where: Figure I shows a front view of a speaker driver motor, and Figure 2 shows 1 is a cross-sectional side view of the driving motor of FIG. 1; FIG. 3 is a front view of a speaker housing; FIG. 4 is a side view of the speaker housing; FIG. 5 is a frequency response; Near-field bass frequency response; Figures 7 to 9 show front views of specific embodiments of the diaphragm, each of which has a supplementary vibration exciter; Figures 10 to 13 show front views of further specific embodiments of the diaphragm Views; Figure 14 shows a perspective view of a further specific embodiment of the diaphragm; Figures 15 to 18 show cross-sectional views of a specific embodiment of the diaphragm; Figures 19 to 21 show a diaphragm ~ surrounding or A cross-section of a specific embodiment of a suspension; FIG. 22 shows a cross-sectional view of a specific embodiment of a speaker drive motor; FIG. 23 shows a front view of a specific embodiment of a diaphragm; A cross-sectional view of a specific embodiment; FIG. 25 shows a comparison FIG polar response of the speaker and the speaker of the piston according to the present invention; and FIG. 26 and 27 prior to the voice coil / diaphragm line drive junctions of Example view more specifically. The best mode for carrying out the present invention is shown in Figs. 1 and 2 as a speaker drive motor (1) for mounting to a sound insulation plate, for example in a housing, please refer to Figs. 3 and 4 below, which include rigidity A circular flat diaphragm of lightweight material, for example, containing a core sandwiched between a high-tensile sheet-9-515220 Λ7 ____ 1 ^ 7 ____ V. Description of the invention A core between the skins of the material, which forms a sound component or radiator, It is used to simultaneously / Gusei 'and bend's to operate under the higher frequency Baoqu wave resonance device. In this way, the driver motor of the present invention can operate as a full range device, which substantially covers all of the sound spectrum with a wide sound dispersion. Unlike a conventional piston driver, its frequency band or at least its dispersion angle is limited by Below the high frequency of the diaphragm diameter, please refer to Figure 25 below, and a bending wave driver, which stops at a frequency below 200 Hz, unless a very large diaphragm size. Generally speaking, the diaphragm (2) is supported by a frame or a basket (3), for example, made of metal, and a ring-shaped flange (4) is formed at the front end, which has a plurality of spaced fixing holes (5). ), So that the frame can be fixed in a suitable hollow speaker housing, please refer to Figures 3 and 4 below. A wave-shaped suspension (6) 'is made of, for example, a rubber-like material, which is fixed to the diaphragm surrounding its periphery by an adhesive, and the suspension can be clamped by the help of a clamp ring (7) The annular flange (4), whereby the diaphragm can be moved piston-like relative to the frame. The frame can support an electrically moving coil transducer (8) for piston-moving the diaphragm and for applying bending wave energy to the diaphragm to resonate, for example in the manner described in WO97 / 09842. The transducer includes a magnet assembly (9) 'which is fixed to the frame and defines an annular gap (1 0) concentric with the diaphragm, and a combination of a coil and the former (丨 丨) is mounted on the frame. The annular gap is used for axial movement and is concentrically fixed to the diaphragm by a coupling ring (12). In common practice, a wave-shaped suspension tripod (1 3) is fixed between the voice coil assembly and the frame, so as to ensure -10- Shichuan China National Standard ((, NS) A4 specification U1.0 κ 29? Male 飨) ~~ ^

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515220 A7 __ B7 _ _ V. Description of the invention (8) ^ " The appropriate axial movement of the 6th tone coil in the annular gap. ^ Haiju tone coil is large relative to the length of the Baoqu wave, and it should be a line driver to the diaphragm, not a point driver, which usually has a small diameter voice coil for bending wave radiators using electric exciters. This line driver provides a significant increase in mechanical drive impedance to the voice coil, and this higher mechanical impedance allows the system to tolerate fairly high-quality voice coils without stopping prematurely at high frequencies. At the same time, because of the large diameter of the voice coil, it is possible to manipulate the rigidity of the diaphragm panel to allow the diaphragm portion surrounded by the voice coil to have multiple modes instead of a single main drum mode, as the same small diameter voice line has . The inner part (丨 6) of the diaphragm can be surrounded by the language coil, as shown in Figure 1, when the outer part (丨 7) of the diaphragm extends radially beyond the voice coil. As shown in Figs. 1 and 2, a small-size, quantity (14, 15) is fixed to the diaphragm within the diameter of the voice coil, thereby adjusting and / or smoothing the frequency response of the sound radiator. This quality is not always necessary, but it is usually required. These masses appear as dispersive masses, but they do not have to be disperse. Its mass range can be from 5 g to 100 g, and the basic range is from 2 to 20 g. It can provide one or more of these qualities. The specific embodiments of the speaker driver of Figs. 1 and 2 have been optimized for use in a stereo speaker, and when coupled to an amplifier, it has a planar voltage conversion function throughout the sound band. Taking this as part of the design conditions for this specific embodiment, the following design parameters can be used. The transducer has a large 75 cm diameter voice coil, which is installed in a low-inductance motor system with an exhaust hole (18), which is on the pole block or the front plate-11 Standard (CNS) Λ4 specification (2 ratio x 297 male I) '515220 A? Η 7 V. Description of the invention () (20) has a copper eddy current shield (19). Figure 2 shows a cross section of a magnetic ring (21) made of neodymium, which is installed in the center of a magnet circuit, and includes-a magnetic cup (2 2) and the front plate (20), resulting in an average of 0.8. B field of T. The Jin coil (1 1) protrudes the magnetic front plate (20) to form a protruding structure. The voice coil contains an aluminum winding with a height of 14.5 cm and is wound on a 0.1 cm thick bobbin. The parameters of the voice coil are as follows: Diameter of the mandrel or coil bobbin = 7 5 cm. Number of coil layers = = 2 wire diameter = 0.3 centimeters of unwound turns = 7 1 The coupling ring (1 2) needs to be placed between the voice coil and the diaphragm. _ Fixed interface provided between. This overlaps inside the voice coil. It provides a 2.5 cm stack to allow a good junction & area between the coupler and the voice coil bobbin. The coupling ring extends the effective length of the voice coil by 1-7 cm, providing a ring width of 3.5 cm to couple to the diaphragm. This system is shown in Figure 2. The material of this light ring is a commercial grade thermoplastic or thermosetting resin, such as ABS, with a mass of 3.4 g. For the coupling between the voice coil and the coupler, a heat-resistant cyanuronic acid (Loctite 4212) was used. This is also used to combine the coupler with the diaphragm. The dynamic parameters of the motor system with the coupling ring are shown below: cm s = 11 g (moving mass of the voice coil combination)

Rms = 1.95 Ns / m (mechanical impedance of suspension)

Bl = 8.1 Tm (motor conversion factor)

Re = 6.5 ohm (DC resistance of voice coil) -12-

The meaning of this paper is suitable for Sichuan National Standards (CNS) Λ4, and strict public goods 515220 A7 _ B7 V. Description of Invention (1C) " " " Γ ^

Fs = 40 Hz (mass spring resonance of the system)

Le = 0.2 mH (inductance factor of the voice coil at 1 kHz) The diaphragm material used and its parameters are as follows: Material = Rotrex Lite 51LS (trade name) 3.5 cm (35 cm thick 51LS uncompressed Rohacell ( Trade name) core solid closed cell polymethacrylimide thermoplastic foam with a glass curtain / thermoplastic skin). Diameter = 120 cm. The parameter series are shown in Table 1 ·· Table 1 Density of the mass area M 0.35 K g / m 2 Poisson ratio N 0.11 Bending rigidity D 1 2.4 N m Bending rigidity D2 1.8 Nm Mud blocking D ττ 0.02 Shear rate in the plane Shr 0.36 Thickness T 3.5 Cm M Shear modulus Gz 19M Pa Mud blocking G z η — 1 Coincidence frequency Fc 7.7 kHz

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From the parameters provided in Table 1, the wavelength of this panel can be calculated using the highest operating frequency, which is 20 kHz. This calculation is based on an average flexural rigidity of 2.1 Nm and a wavelength of 28 cm. Therefore, the voice coil diameter is 2.7 times the wavelength of the highest frequency operation. In the previous technology of curved wave speakers, the first empty -13- This paper size is applicable to the Chinese National Standard (CMS) A4 specification (210 X 297 mm) 515220

AT B7 V. Description of the Invention (11) The hole resonance corresponds to a half wavelength of the voice coil. The coincident blades of this panel provide strong off-axis output close to or above the coincident frequency, as shown in Table 1 above. As shown in the indication diagram of FIG. 25, wherein the thin line or trace (4 5) is a pattern of a speaker having a 300 cm diameter diaphragm according to the present invention, and the thick trace (4 4) is a conventional 250 Piston diaphragm with cm diameter. The frame contains an aluminum back plate (23) to support the transducer (8), which is connected to the front flange (4). An Allen bolt (not shown) is used to secure the clamp ring (7) to the flange (4). The pair of masses (14, 15) fixed to the diaphragm is used to smooth the first drum pattern of the inner part of the diaphragm, which is about 2 kHz. The parameters of the motor drive unit are as follows: d D = 14 cm (diameter of the radiation area (centered on the center of the periphery)) cm s = 27 g (moving mass of the voice coil and diaphragm combination)

Rms = 2.4 Ns / m (mechanical impedance of suspension)

Bl = 8.1 Tm (motor conversion factor)

Re = 6.5 ohm (DC resistance of voice coil)

Fs = 33 Hz (mass spring resonance of the system)

Le = 0.2 mH (inductance factor of the voice coil at 1 kHz) Figures 3 and 4 show the speaker housing (24) of the drive unit of Figures 1 and 2, which has an inclined front side (2 5) and side edges ( 2 6). A cavity (2 7) is provided on the thistle side (2 5) to receive the drive unit or motor (1). The enclosure has been designed to provide a volume of 17 liters for a maximum planar alignment. The shell form was chosen to destroy the standing wave of the inner shell, although it is not the design of the speaker. -14- This paper size Lin Chuan threshold National Standard Apple (CNS) 8 4 specifications (2U) X 297 mm) B7 V. Invention Say ^ (12) " '-and necessary for operation. The shell is constructed of [8 cm medium density fiberboard (mdf)]. The contacts are glued (using pVA wood glue) and rotated to provide a hermetic seal. The following measurement of the above specific embodiment of the speaker was performed in an echoless state. The microphone is located at m (on the axis of the diaphragm) and outputs 2.83 v. As shown in FIG. 5, inaccuracy may occur for measurements below about 200, so a close field measurement showing the low frequency performance is shown in FIG. When the specific embodiment of FIGS. 1 and 2 uses a single large-diameter voice coil driver, a supplementary excitation device can be used to improve the high frequency level and / or extension, and the directivity of the speaker. The supplementary exciter can be placed anywhere on the diaphragm to provide a smaller radiation area. Like a large area piezoelectric device, you can use a small area or strip form, or a smaller moving coil device. This system is shown in Figures 7. to 9. In Fig. 7, it will be seen that a circular piezoelectric disc vibration exciter (28) has been installed in the center of the diaphragm (2) and the inside of the diameter of the voice coil (11). In the specific embodiment of FIG. 8, a piezoelectric strip-shaped vibration exciter (29) has been mounted on the diaphragm (2), and is co-centered with it 'on the inside of the diameter of the voice coil (11). In Figure 9, a circular disc vibration exciter (30) has been installed on the inner diaphragm (2) of the voice coil diameter (i), but off-center. It can be seen that the moving quality of the voice coil has a small effect on the high frequency expansion of the speaker. Therefore, the present invention is not limited to a lightweight voice coil. This represents the scope of using a moving magnet motor system, and / or a rather high mass coupling ring between the voice coil assembly and the diaphragm, which can currently be excluded from small drive areas or point drive designs for curved wave speakers. This permits -15- The meaning of this paper is in accordance with China National Standards (CNS) A4 specifications (210X297). A7 '----——. —____ B7 V. Description of the invention (13) ---- 々 复 4 的The coupler is designed to convert the voice coil ring into other better shapes to improve political performance. Triangular, square, and elliptical coupling examples are shown in Figures 10 to 12, respectively, and refer to (31) to (33), respectively. These two shapes represent the distribution of excited modes and therefore represent the meaning of the direction. For example, 'as shown in Figure 13, if a triangular diaphragm (34) has been selected, together with a rectangular coupler ring (32) rotated by an angle relative to the diaphragm side, it can provide a more unusual one in the diaphragm. Modal style. This can further improve the frequency response on and off axis. In the specific embodiment of FIGS. 1 and 2, the diameter of the voice coil is 75 cm. This can be increased or decreased according to the design specification. If the design specification requires narrower directivity for differentiating applications, a larger voice coil can be used, which is coupled to a low wave speed panel, which has a very high F c. Conversely, if wide directivity is required, a smaller voice coil can be used, which is under the condition of a line driver. However, this requires electrical high-frequency pressurization to maintain a fixed pressure throughout the sound band. As shown in Fig. 13 above, the present invention is not limited to the circular panel shape shown in the specific embodiments of Figs. Other shapes for directivity and / or frequency response may be better because different modal shapes can be created by the panel geometry. It can be expected that a more complex pattern shape in this panel makes less directivity in the sound output. Examples include square, rectangular, and hexagonal panels. At the same time, as shown in Figure 14, the present invention is not limited to diaphragm pure piston behavior at low frequencies, and tympanic membrane-like behavior at low frequencies. The diaphragm (3 4) can be a large light-emitting panel. This can provide a self-barrier device, and provide a pair of -16- this paper κ degree suitable for Sichuan Ten Threshold National Standard (C NS) Λ4 specification (210 X 297 mm) 515220 A7 ___ B7 V. Description of the invention (14 ) Very low bone response, as shown by the relative arrows. The edge of the panel can be free or lost. The invention is not limited to a planar diaphragm or to a single material form. The profile and shape of the diaphragm can be used to change the modal behavior. For example, the diaphragm portion surrounded by the language coil may be constructed of different materials, or use the same material but be thicker or thinner. Exemplary embodiments are shown in FIGS. 5 to 18. Rigidity can be applied to the diaphragm by contouring. Variations in stiffness can also be achieved using material isotropy. Therefore, in FIG. 15, the inner part (16) of the diaphragm (2) is thinned by denting its lower skin. In Fig. 16, the inner portion (16) of the diaphragm is thickened. In Fig. 17, the inner portion (16) of the diaphragm (2) is thinner uniformly than the outer portion (1 7) of the diaphragm. In FIG. 18, the outer part (1 7) of the diaphragm (2) gradually decreases in thickness toward the inner part until it reaches the left side of the drawing '... and its formation can be seen from the right side of the drawing A curved profile of varying thickness. It can be seen that the diaphragm surround affects sound performance. Both the piston and the modal region can be changed by changing the surrounding material properties. In particular, if a mass is applied to the perimeter of the diaphragm, as shown by (36) in FIG. 19, high-frequency performance can be improved. The diaphragm's edge damping can be used to control its modal behavior. This can be in the form of surface treatment or edge damping, which can be performed by the surrounding foot, as shown in (37) in FIG. The panel skin, or one of them, can be used to form the surround, as shown in Figure 21. In this specific embodiment, the membrane includes a core (38), and an epidermis (39, 40) covering the core. The lower epidermis (40) is extended to form the surround or suspension (6). This can provide cost benefits. Benefits may also include low loss termination of the diaphragm. -17- The size of this paper is Shizhou Mid-Threshold National Standard Zheng (CNS) 8-4 (210X297 mm)

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515220 Λ7 B7 V. Description of the invention (15 Radiation at frequencies close to and above the coincidence frequency (fc) is used in this preferred embodiment to widen the directivity at high frequencies. However, coincidence Can be set at either end of the spectrum. Increasing the rigidity of the panel / decreasing the coincidence frequency should still provide wider directivity and improve the sensitivity of the modal area. Use an isotropic diaphragm, for example at about twice the F c, It will provide side blades at the same location in both planes. When using an anisotropic panel, coincidence can be independently set in spaced planes to provide a smoother overall power response. Mechanical elements such as coupled to The quality of the panel or the voice coil can provide a mechanical filtering device. By placing an interface between the voice coil coupler and the panel, the frequency response can be corrected. The passive component is electrically inclined or the amplifier conversion function is inclined Placement / high-frequency pressurization can also be used to modify the sound output of the device. In the specific embodiment of FIGS. 1 and 2, the interference sound is radiated by the annular area, wherein the voice coil It is fixed to the diaphragm. This can cause transmission at high frequencies due to a large radiation area relative to the wavelength in 2 gas. As shown in Figure 22, the directivity is widened at high frequencies, one with a small cavity (42 The cover (4 1) can be placed on the inner part (16) of the diaphragm (:) mounted on the support (43) of the frame (3) to convert this to a smaller radiation area. This effect It has been seen when the measurement is performed from the rear of the device. In the specific embodiment of the drawings and the embodiment, the exhaust hole (18) in the motor system forms the cover cavity, which is considered after the radiation. If necessary, as shown in FIG. 23, the eccentric position of the diaphragm (2) is used to improve the resonance mode excited in the diaphragm of the voice coil (1 1). The paper M financial specifications _ X 297 public goods)一 丨 一 _ B7 V. Description of the invention () " S-- The distribution has an anti-balance mass (3 5) placed on the diaphragm to prevent vibration. As shown in Figure 24, the diaphragm (2) does not need Is flat and can be recessed or otherwise formed to increase its stiffness. This can take advantage of the varying curvature across the diaphragm Form, so the rigidity becomes larger toward the edge of the diaphragm, as shown in the figure. The curvature or contouring of the diaphragm can assist in scaling the diaphragm, while keeping fc fixed, and it can help smooth the piston for modal conversion. , Especially for larger diaphragms. In Figure 26, it shows a circular diaphragm (2), which is driven by a transducer coil, which is not shown, and has a straight line configuration The coupler (46), which is equivalent to the coupler ring (12) of the specific embodiment of FIGS. 1 and 2, is connected between the voice coil and the diaphragm to provide a linear drive interface. The ballast ( 4 6) It is arranged and arranged on a diameter of the diaphragm, and its ends are evenly spaced from opposite edges of the diaphragm. In Fig. 27, 'It shows a rectangular diaphragm (2 ) 'It is not shown, and it has a coupler (46) composed of a line connected between the voice coil and the diaphragm to provide a line-driven interface. The coupler (4 6) is placed eccentrically to the diaphragm and makes an angle with respect to the side of the diaphragm. Industrial Applicability The invention thus provides an effective way to increase the frequency bandwidth of a bending wave speaker. -19- This paper is suitable for Sichuan National Standard (C NS) Λ4 specification (2ίο X 297) 515220 Λ7 Β7 V. Description of the invention (17) P. 6558-Reference symbol ————__ 1 Drive motor 2 Diaphragm 3 Frame 4 Front flange 5 Hole 6 Suspension 7 Clip ring 8 Transducer 9 Magnet combination 10 Ring gap 11 Voice coil combination 12 Coupling ring, 13 Tripod 14 Mass 15 Mass 16 2 Internal part 17 2 External Section 18 Exhaust hole 19 Copper shield 20 Front plate (pole block) 2 1 Magnet 22 Magnetic cup 23 Frame back plate -20- This paper is suitable for Sichuan Chuan fujian® family standard apple (CNS) Λ4 now (210 X 297 male I) 515220 Λ 7 Β7 V. Description of the invention (18 24 case 25 case front side 26 case side 27 cavity 28 piezo disc 2 9 piezo strip 3 0 piezo disc 3 1 Α coupler 3 2 □ Coupler 3 3 0 Coupler 34 Rectangular diaphragm 3 5 Anti-balance 3 6 Mass-, 3 7 Footprint (vibration damping) 3 8 Core 39 Skin 40 Skin 4 1 Mask 42 Hollow 43 Support 44 Thick trace 45 Fine trace 46 Straight Line Coupler-21-This paper Associate (CNS) Α4 specification (210 Χ 297 public-funded)

Claims (1)

515220 Λ 8 B < S C.8 6. Scope of patent application 1. A loudspeaker comprising a sound component in the form of a flat plate for use as a blue curve wave radiator and an electric moving coil transducer, which has the phrase The coil is 'mounted to the sound component to excite bending wave vibration in the sound component', wherein the interface between the voice coil and the sound component has a sufficient length related to the size of the read sound component to represent a line driver such that The sound component has a mechanical impedance, which has an upward trend in bending wave frequency. 2 The loudspeaker according to item 1 of the scope of patent application, wherein the interface between the voice coil and the sound component is circular. 3. The speaker as claimed in item 1 or 2 of the patent scope, wherein the interface between the voice coil and the acoustic component is substantially continuous. 4. If the speaker of item 2 of the patent scope is requested, the ear coil 3 component of the voice coil ring VC (the thickness is different from that of the voice component outside the voice coil. 5. If the scope of patent application is the first Xiang Zhiyang wailed, gan yi., Heart, different, in which the sound component can also be moved in the overall mode by the transducer. 6 · Such as crying Yang Xiang on page 2 of the patent application, ^ 柯Zhuo Zun, which includes a device to put mass into the voice component within the diameter of the voice coil. 7. As the first patent application scope of the Qing Dynasty cry hard _ Jia n handle Yanzhai, where the shape of the voice component is non- Circular. 8. For example, if the volume of the patent application is No. 1, the transducer bone coil system is concentric with the geometric center of the sound component. Cry 4 ", including a second transducer that is coupled to the sound component in its part surrounded by the voice coil-22- 9. 515220 six 1 1 1 1 1 1 1 1 Λ 8 Β8 C8 ----- Π8 applied for patent scope and used to cause high Bending wave activity. For example, the speaker in the ninth scope of the patent application, wherein the second transducer is deviated from the axis of the voice coil. Attached to the sound component, the coupling device has a non-circular footprint. For example, the speaker of the scope of patent application item 1, wherein the portion of the sound component surrounded by the language coil is greater than the sound component in the voice. The part outside the coil is hard. For example, the speaker of the scope of patent application, the bending rigidity of the sound component is anisotropic. For the speaker of the scope of patent application, the frame includes a frame, a A part surrounds the sound component, and another part supports the electric transducer, and includes a device connected between the sound component and the frame part, and the sound component is elastically suspended on the frame. The loudspeaker according to item 14 of the patent, wherein the suspension device is connected between the frame and the edge of the sound component. For example, the loudspeaker according to item 14 or 15 of the patent application, wherein The elastic suspension is used to put the mass into the sound component. For example, the speaker of the scope of patent application No. 14 is used, and the elastic suspension is used to damp the sound component. The elastic suspension is formed at least in part by the skin of the sound radiator. For example, the loudspeaker of the first patent application scope, wherein the sound component has -23- This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 male) %) On the other hand, the sound energy is radiated from it, and it includes a sound masking device ′, u million; 忒 The sound component is over the part surrounded by the voice coil, and the cover defines a sound cavity. 〇. As stated in the speaker of the first patent scope, wherein the electric moving coil transducer is deviated from the geometric center of the sound component, and contains an anti-balanced mass on the sound component. 21. The loudspeaker according to the scope of patent application item i is used as a full range device. 2 2. The loudspeaker according to the scope of patent application item i, wherein the sound component is recessed or otherwise shaped to increase its rigidity. 2 3. The loudspeaker according to item 1 of the scope of patent application, wherein the configuration is such that the acoustic component is excited by bending wave vibration having a frequency close to or greater than the coincident frequency. 2 4 · The speaker of item i in the scope of patent application, wherein the size shape or position of the interface between the voice coil and the 45 component is configured according to the modal distribution of the sound component, so as to achieve Motion smoothly transitions to resonant bending wave behavior at higher frequencies. -24- This paper size applies to China National Standard (CNS) A4 (210 X 297)