Speaker attachment member, speaker attachment structure, and interior body attachment structure for mobile body

Abstract

An inner panel (20) comprises: a base (30) to which a speaker device (10) is attached; and a protrusion (32) which is formed so as to protrude from at least one surface of the base (30) in the plate thickness direction of the base (30), said protrusion (32) being formed so as to surround a resonant portion (R) in the resonance mode of the base (30), and so as to span across the resonant portion (R).

Description

Speaker mounting member, speaker mounting structure, and interior body mounting structure for mobile body

[0001] The present disclosure relates to a speaker mounting member, a speaker mounting structure, and an interior body mounting structure for a vehicle.

[0002] Jitsuto Publication No. 2599532 discloses a technique in which a bracket made of steel plate, to which a speaker driver unit is attached, is attached to the inner body of an automobile via a closed-cell resin such as butyl resin.

[0003] It is preferable that the speaker mounting member has a simple structure and improves the acoustic performance of the speaker device.

[0004] In consideration of the above, an object of the present disclosure is to improve the acoustic performance of a speaker device with a simple configuration.

[0005] A speaker mounting member of a first aspect of the present disclosure comprises a base portion to which a speaker device is attached, and a raised portion that protrudes from at least one surface of the base portion in the thickness direction of the base portion, surrounds a resonating portion in a resonant mode of the base portion, and is further formed so as to cross the resonating portion.

[0006] In the speaker mounting member of the second aspect of the present disclosure, the speaker mounting member of the first aspect of the present disclosure is provided with an opening formed in the base portion into which at least a part of the speaker device is inserted, and the raised portion is formed to surround the opening.

[0007] A speaker mounting member of a third aspect of the present disclosure is the speaker mounting member of the second aspect of the present disclosure, wherein the speaker device is mounted on the protruding portion.

[0008] A speaker mounting member of a fourth aspect of the present disclosure is a speaker mounting member of any one of the first to third aspects of the present disclosure, wherein the raised portion is formed to surround the resonating portion of the base portion in the primary resonance mode and the secondary resonance mode.

[0009] A speaker mounting member of a fifth aspect of the present disclosure is the speaker mounting member of any one of the first to fourth aspects of the present disclosure, wherein a groove is formed in the raised portion.

[0010] A speaker mounting member of a sixth aspect of the present disclosure is a speaker mounting member of any one of the first to fifth aspects of the present disclosure, wherein the protrusion formed on the front surface of the base portion and the protrusion formed on the back surface of the base portion are arranged at approximately the same position when viewed from the thickness direction of the base portion.

[0011] A speaker mounting member of a seventh aspect of the present disclosure is a speaker mounting member of any one of the first to sixth aspects of the present disclosure, wherein the raised portion is connected from one rigid portion of the base portion to another rigid portion.

[0012] A speaker mounting member of an eighth aspect of the present disclosure is the speaker mounting member of any one of the first to seventh aspects of the present disclosure, and is made of a material containing fiber reinforced resin.

[0013] A speaker mounting member of a ninth aspect of the present disclosure is the speaker mounting member of the eighth aspect of the present disclosure, wherein the fiber reinforced resin contains reinforcing fibers having a weight average fiber length of 100 mm or less that are randomly oriented.

[0014] A speaker mounting member of a tenth aspect of the present disclosure is a speaker mounting member of any one of the first to ninth aspects of the present disclosure, and is provided with an opening formed in the base portion into which at least a part of the speaker device is inserted, the opening being an opening of a speaker box formed in the shape of a bottomed box that accommodates at least a part of the rear side of the speaker device.

[0015] A speaker mounting member of an eleventh aspect of the present disclosure is the speaker mounting member of the tenth aspect of the present disclosure, wherein the speaker box has a reflection suppressing shape that suppresses reflected sound directed toward the speaker device.

[0016] A speaker mounting structure of a twelfth aspect of the present disclosure comprises a speaker mounting member of any one of the first to eleventh aspects of the present disclosure, and a speaker device mounted in an opening formed in the base portion into which at least a portion of the speaker device is inserted, and the speaker mounting member is a body panel of a mobile body, an intermediate member mounted to the body panel, or the body panel and the intermediate member.

[0017] A speaker mounting structure of a thirteenth aspect of the present disclosure is the speaker mounting structure of the twelfth aspect of the present disclosure, further comprising a support body that supports the rear side of the speaker device.

[0018] A speaker mounting structure of a fourteenth aspect of the present disclosure is the speaker mounting structure of the twelfth or thirteenth aspect of the present disclosure, and is provided with a diffuser on the rear side of the speaker device that prevents reflected sound that is emitted to the rear side and reflected from returning to the speaker device.

[0019] An interior body mounting structure for a vehicle of a fifteenth aspect of the present disclosure includes a speaker mounting structure of any one of the twelfth to fourteenth aspects of the present disclosure, and the speaker mounting member is a mounting panel for mounting an interior body for a vehicle.

[0020] In the speaker mounting member of the first aspect of the present disclosure, the raised portion surrounds the resonating portion of the base portion in the resonant mode and also crosses the resonating portion, thereby suppressing vibration of the resonating portion in the resonant mode. This reduces the effect of the resonance of the speaker mounting member on the speaker device. As a result, the acoustic performance of the speaker device can be improved with a simple configuration.

[0021] In the speaker mounting member of the second aspect of the present disclosure, the raised portion is formed to surround the opening, so that the raised portion is formed on the base portion where vibrations from the speaker device are transmitted to the base portion. Therefore, vibrations of the speaker device that cause the base portion to vibrate are suppressed. As a result, the acoustic performance of the speaker device can be improved with a simple configuration.

[0022] In the speaker mounting member of the third aspect of the present disclosure, the speaker device is attached to the raised portion, so that the speaker device is held by a portion with high rigidity, thereby suppressing vibration of the base portion due to vibration of the speaker device.

[0023] In the speaker mounting member of the fourth aspect of the present disclosure, the raised portion is formed to surround the resonating portion of the base portion in the primary resonance mode and the secondary resonance mode, thereby suppressing vibration of the base portion in the large-amplitude resonance mode, thereby improving the acoustic performance of the speaker device with a simple configuration.

[0024] In the speaker mounting member of the fifth aspect of the present disclosure, the grooves are formed in the raised portions, thereby reducing the weight, thereby improving the acoustic performance of the speaker device while reducing the weight.

[0025] In the speaker mounting member of the sixth aspect of the present disclosure, the raised portion formed on the front surface of the base portion and the raised portion formed on the back surface of the base portion are located at approximately the same position when viewed from the thickness direction of the base portion, thereby strengthening the reinforcement of the base portion by the raised portion, thereby further improving the acoustic performance of the speaker device with a simple configuration.

[0026] In the speaker mounting member of the seventh aspect of the present disclosure, the raised portion is connected from one rigid portion of the base portion to another rigid portion, thereby effectively suppressing vibrations transmitted from the speaker device to the speaker mounting member, thereby further improving the acoustic performance of the speaker device with a simple configuration.

[0027] In the speaker mounting member of the eighth aspect of the present disclosure, the speaker mounting member is made of a material containing fiber-reinforced resin, which is lighter than metal and can improve the acoustic performance of the speaker device. Furthermore, the speaker mounting member can be molded as a single unit by taking advantage of the fluidity of the fiber-reinforced resin.

[0028] In the speaker mounting member of the ninth aspect of the present disclosure, the fiber-reinforced resin contains reinforcing fibers with a weight-average fiber length of 100 mm or less randomly oriented, thereby making it possible to produce a molded body that is less susceptible to variations in physical properties due to bias or entanglement of the reinforcing fibers.

[0029] In the speaker mounting member of the tenth aspect of the present disclosure, the opening is an opening in a speaker box formed in a box-like shape with a bottom that accommodates at least a portion of the rear side of the speaker device, so that the rear side of the speaker device is covered by the speaker box. This prevents sound emitted from the rear side of the speaker device from leaking to the outside, thereby improving the acoustic performance of the speaker device.

[0030] In the speaker mounting member of the eleventh aspect of the present disclosure, the speaker box has a bottom wall facing the rear surface of the speaker device that has a reflection-suppressing shape, which suppresses the reflected sound emitted to the rear surface of the speaker device from returning to the speaker device, thereby further improving the acoustic performance of the speaker device.

[0031] In the speaker mounting structure of the twelfth aspect of the present disclosure, the speaker mounting member is a body panel of a mobile body, an intermediate member attached to the body panel, or a body panel and an intermediate member, thereby making it possible to create a speaker mounting structure that improves the acoustic performance of the speaker device.

[0032] In the speaker mounting structure of the thirteenth aspect of the present disclosure, the support member that supports the rear side of the speaker device supports the magnetic circuit of the speaker device. Therefore, vibration of the magnetic circuit when the speaker device is driven is suppressed. As a result, the acoustic performance of the speaker device can be improved.

[0033] In the speaker mounting structure of the fourteenth aspect of the present disclosure, a diffuser is provided on the rear side of the speaker device to prevent sound emitted to the rear side and reflected from returning to the speaker device, thereby preventing the sound emitted to the rear side of the speaker device from returning to the speaker device, thereby improving the acoustic performance of the speaker device.

[0034] In the vehicle interior body mounting structure of the fifteenth aspect of the present disclosure, the speaker mounting member is a mounting panel for mounting the vehicle interior body, so that the speaker mounting member is a member to which the speaker device is mounted and a member to which the vehicle interior body is mounted. Therefore, the speaker mounting member is a member having two functions and can be configured simply.

[0035] According to the present disclosure, it is possible to improve the acoustic performance of a speaker device with a simple configuration.

[0036] 1 is a cross-sectional view showing a vehicle door structure according to a first embodiment. FIG. 2 is a cross-sectional view showing a speaker device mounting structure according to a first embodiment. FIG. 3 is a front view schematically showing an inner panel according to a first embodiment. FIG. 4 is a cross-sectional view showing an inner panel according to a first embodiment, showing the A-A cross section of FIG. 3. FIG. 5 is a graph showing the results of a frequency response analysis in a resonance mode for an analytical model of a base portion, the analysis results being for a first resonance mode. FIG. 6 is a graph showing the results of a frequency response analysis in a resonance mode for an analytical model of a base portion, the analysis results being for a second resonance mode. FIG. 7 is a graph showing the results of a frequency response analysis in a resonance mode for an analytical model of a base portion, the analysis results being for a third resonance mode. FIG. 8 is a graph showing the results of a response analysis performed on an analytical model of a base portion, the relationship between frequency and acceleration. FIG. 9 is a graph showing the results of sound pressure frequency measurements performed on an example and a comparative example. FIG. 10 is a graph showing a waterfall analysis of the results of an FFT analysis of an impulse response, the graph showing a comparative example. FIG. 11 is a graph showing a waterfall analysis of the results of an FFT analysis of an impulse response, the graph showing an example. FIG. 12 is a cross-sectional view showing an inner panel according to a second embodiment. FIG. 13 is a cross-sectional view showing a speaker mounting structure according to a third embodiment. FIG. 10 is a cross-sectional view showing a speaker mounting structure according to a fifth embodiment.

[0037] First Embodiment A speaker mounting member and a speaker mounting structure 7 according to a first embodiment will be described below with reference to the drawings. In the first embodiment, an example will be described in which the speaker mounting member is used as an inner panel (an example of a body panel) of a door of an automobile (an example of a moving body) as a vehicle. In each drawing, the arrow FR indicates the front side in the longitudinal direction of the vehicle, the arrow UP indicates the upper side in the vertical direction of the vehicle, and the arrow OUT indicates the outside in the width direction of the vehicle. Furthermore, the sound output side from which sound is output from the speaker device 10 is defined as the front, and the rear side opposite the sound output side is defined as the rear.

[0038] [Configuration of Door 1] As shown in FIG. 1 , the door 1 includes an outer panel 2, an inner panel 20, a speaker device 10 attached to the inner panel 20, and a door trim (an example of an interior body for a vehicle) 4.

[0039] The outer panel 2 is formed into a plate shape from metal (e.g., steel plate or aluminum alloy) and is provided on the outer side of the inner panel 20 in the vehicle width direction. The door trim 4 is formed into a plate shape from resin or the like and is provided on the inner side of the inner panel 20 in the vehicle width direction and attached to the inner panel 20.

[0040] The lowered door window 6 is accommodated between the inner panel 20 and the outer panel 2 in the vehicle width direction. The inner panel 20 constitutes a mounting panel to which the door trim 4 is attached.

[0041] 2, the speaker device 10 is attached to an inner panel 20 with screws S. The speaker device 10 has a magnetic circuit 14, a cone-shaped diaphragm 17, and a bowl-shaped frame 18.

[0042] A bobbin 15 around which a voice coil 15A is wound is connected to the inner edge of the diaphragm 17 so as to transmit the vibration of the bobbin 15. The outer edge of the diaphragm 17 is attached to a flange portion 18A of a frame 18.

[0043] A magnetic circuit 14 is attached to the bottom 18B of the frame 18. The magnetic circuit 14 includes a yoke 11, a disk-shaped magnet 12, and a disk-shaped pole piece 13. A voice coil 15A is disposed in a magnetic gap G of the magnetic circuit 14.

[0044] In the speaker device 10 configured in this manner, a drive current is applied to the voice coil 15A based on an audio signal output from an audio amplifier (not shown). When the voice coil 15A crosses the magnetic flux formed by the magnetic circuit 14, an electromagnetic force is excited by the magnetic flux and the drive current, causing the diaphragm 17 to vibrate via the bobbin 15, and sound is radiated in front of and behind the diaphragm 17.

[0045] [Configuration of Inner Panel 20] The inner panel 20 can be formed of, for example, a resin. The resin forming the inner panel 20 may be a resin mainly composed of a thermoplastic resin, a resin mainly composed of a thermosetting resin, or a resin containing optional components such as a flame retardant or reinforcing fiber.

[0046] Examples of thermosetting resins include epoxy resins, vinyl ester resins, unsaturated polyester resins, diallyl phthalate resins, phenolic resins, maleimide resins, cyanate resins, benzoxazine resins, and dicyclopentadiene resins. Examples of thermoplastic resins include polyolefin resins, polystyrene resins, thermoplastic polyamide resins, polyester resins, polyacetal resins (polyoxymethylene resins), polycarbonate resins, (meth)acrylic resins, polyarylate resins, polyphenylene ether resins, polyimide resins, polyethernitrile resins, phenoxy resins, polyphenylene sulfide resins, polysulfone resins, polyketone resins, polyether ketone resins, thermoplastic urethane resins, fluorine-based resins, and thermoplastic polybenzimidazole resins.

[0047] From the viewpoint of mechanical properties, it is preferable that the resin forming the inner panel 20 contains a fiber-reinforced resin containing reinforcing fibers.

[0048] The type of reinforcing fiber is not particularly limited, and may be either inorganic fiber or organic fiber.

[0049] Examples of inorganic fibers include carbon fibers, activated carbon fibers, graphite fibers, glass fibers, tungsten carbide fibers, silicon carbide fibers (silicon carbide fibers), ceramic fibers, alumina fibers, natural mineral fibers (such as basalt fibers), boron fibers, boron nitride fibers, boron carbide fibers, and metal fibers. Examples of organic fibers include fibers made of aramid, PBO (polyparaphenylenebenzoxazole), polyphenylene sulfide, polyester, acrylic, polyamide, polyolefin, polyvinyl alcohol, polyarylate, and the like. Reinforcing fibers may be continuous or discontinuous fibers of a specific length. Examples of continuous fibers include woven fabrics, knitted fabrics, and fabrics in which multiple reinforcing fiber threads are arranged in one direction.

[0050] It is preferable that the resin forming the inner panel 20 is made of a material containing a fiber-reinforced resin in which reinforcing fibers with a weight-average fiber length of 100 mm or less are randomly oriented and present in the resin component (matrix resin), as this increases the manufacturing efficiency of the resin material molding step in the manufacture of the inner panel 20.

[0051] Regarding the random orientation of the reinforcing fibers, a so-called two-dimensional random orientation, in which the reinforcing fibers are not aligned in a specific direction in the in-plane direction but very few are oriented in the thickness direction, as in the molded article obtained by the method described in WO 2007 / 020910 or WO 2012 / 165418, is preferred because it has excellent physical properties and can be easily reused (remolded) when no longer needed.

[0052] When it is particularly desired to numerically define the two-dimensional random orientation of the reinforcing fibers contained in the fiber-reinforced resin molding material or molded body, as shown in JP 2012-246428 A, the preferred two-dimensional random orientation may be a state in which the reinforcing fibers have a planar orientation degree σ of 90% or more, as defined by the planar orientation degree σ = 100 × (1 - (number of reinforcing fibers with a planar orientation angle γ of 10° or more) / (total number of reinforcing fibers)).

[0053] Reinforcing fibers having a weight-average fiber length of 100 mm or less are preferred because they produce a molded article that is less susceptible to variations in physical properties due to unevenness or entanglement of the reinforcing fibers. The weight-average fiber length is more preferably 1 to 100 mm, even more preferably 3 to 80 mm, and particularly preferably 5 to 60 mm.

[0054] As shown in FIG. 1 , the inner panel 20 has a base portion 30 , a rigid portion 21 , and a speaker box 22 .

[0055] (Base plate portion 30) The base plate portion 30 is formed in a plate shape with its thickness direction aligned with the vehicle width direction. As shown in Figures 2 and 3, the base plate portion 30 is formed in a rectangular plate shape with its major axis aligned with the vehicle front-rear direction and its minor axis aligned with the vehicle up-down direction. The plate thickness of the base plate portion 30 may be, for example, 1.5 mm. The rear side of the speaker device 10 is inserted into and attached to an opening 38A formed in the base plate portion 30. The speaker device 10 is disposed with its diaphragm 17 facing inward in the vehicle width direction. The rear side of the speaker device 10 is housed in a speaker box 22, which will be described later. Note that the base plate portion 30 may be provided with an opening such as a service hole.

[0056] 3 and 4 , the base portion 30 has a raised portion 32 that is raised in a generally rectangular shape from the front surface (the inner surface in the vehicle width direction) of the base portion 30 in the thickness direction of the base portion 30. The height of the raised portion 32 may be, for example, 1 mm. The raised portion 32 may be raised in a generally circular shape from the front surface of the base portion 30 in the thickness direction of the base portion 30, or may be formed in a bead shape with a generally U-shaped cross section.

[0057] The raised portion 32 includes a first raised portion 33 , a second raised portion 34 , a third raised portion 35 , and a fourth raised portion 36 .

[0058] The first protrusions 33 are formed near the outer periphery of the base portion 30. The first protrusions 33 include those formed to extend in the minor axis direction of the base portion 30 and those formed to extend in the major axis direction of the base portion 30. The first protrusions 33 formed to extend in the minor axis direction of the base portion 30 are connected to rigid portions 21 (see FIG. 1 ), which are described below and are formed above and below the base portion 30.

[0059] The second protrusions 34 are formed to connect the first protrusions 33 extending in the minor axis direction of the base portion 30. The second protrusions 34 are formed to connect the first protrusions 33 extending in the major axis direction of the base portion 30. The second protrusions 34 are formed to surround a resonating portion R in the resonance mode of the base portion 30. The resonating portion R is defined as an antinode portion of the amplitude of the antinode and node of the amplitude generated in the base portion 30 in the resonance mode. In other words, the resonating portion R is a antinode of the displacement amplitude where the amplitude in the resonance mode is large, and is defined as a portion of the base portion 30 where the amplitude in the thickness direction is large. When the second protrusions 34 are formed in a substantially rectangular shape to surround the resonating portion R1 in the primary resonance mode of the base portion 30 and the resonating portion R2 in the secondary resonance mode of the base portion 30, the volume of the second protrusions 34 can be reduced while maintaining rigidity. The second raised portion 34 may be formed in a substantially circular shape so as to surround the resonating portion R1 in the primary resonance mode of the base portion 30 and the resonating portion R2 in the secondary resonance mode of the base portion 30 .

[0060] The third raised portions 35 are formed so as to connect the first raised portions 33 extending in the minor axis direction of the base portion 30. The third raised portions 35 are formed so as to cross the resonating portion R in the minor axis direction of the base portion 30.

[0061] The fourth raised portion 36 is formed in a circular shape so as to surround the opening 38 A. The speaker device 10 may be attached to the base portion 30 with the flange portion 18 A of the frame 18 in contact with the fourth raised portion 36 .

[0062] (Rigid portion 21) As shown in Fig. 1 , the rigid portion 21 is formed at the upper and lower ends of the base portion 30. The rigid portion 21 is a portion of the inner panel 20 that has a higher bending rigidity due to its shape compared to the bending rigidity of the base portion 30 in the plate thickness direction. In the first embodiment, the boundary between the rigid portion 21 and the base portion 30 is used as the starting point of bending. The rigid portion 21 is a bending portion of the inner panel 20 or a portion where a reinforcing structure is provided for the inner panel 20.

[0063] The rigid portion 21 formed at the upper end of the base portion 30 is formed to curve outward in the vehicle width direction. The rigid portion 21 formed at the lower end of the base portion 30 is formed to bend outward in the vehicle width direction. The raised portion 32 is formed to connect the rigid portion 21 formed at the upper end of the base portion 30 and the rigid portion 21 formed at the lower end of the base portion 30.

[0064] 2, the speaker box 22 is formed by side walls 24 and a bottom wall 23 into a box shape with an open inner surface in the vehicle width direction. The speaker box 22 is formed into a box shape so as to accommodate the rear side of the speaker device 10. The speaker box 22 accommodates a part of the diaphragm 17 of the speaker device 10 and the magnetic circuit 14. The opening of the speaker box that accommodates the rear side of the speaker device 10 is the opening 38A of the base portion 30.

[0065] The side walls 24 are formed in a cylindrical shape extending in the vehicle width direction. The bottom wall 23 is formed in a plate shape that closes the outer end of the side walls 24 in the vehicle width direction. Note that the side walls 24 may be formed in a cylindrical shape, but are preferably formed in a rectangular cylindrical shape from the viewpoint of suppressing radial resonance.

[0066] The speaker box 22 may have a reflection-suppressing shape. The reflection-suppressing shape is a shape that suppresses the reflection of sound emitted from the rear side of the speaker device 10 in a direction toward the speaker device 10 in the speaker box 22. For example, the reflection-suppressing shape is a shape in which the bottom wall 23 is inclined with respect to the vertical direction of the vehicle.

[0067] As the reflection suppressing shape, the bottom wall 23 may be inclined with respect to the longitudinal direction of the vehicle, the bottom wall 23 or the side wall 24 may be provided with an uneven shape, or the bottom wall 23 may be rounded, including a spherical or rugby ball shape. As the reflection suppressing shape, the side wall 24 may be inclined with respect to the width direction of the vehicle, or the speaker box may be formed into a conical shape.

[0068] [Method of Manufacturing Inner Panel 20] The inner panel 20 can be manufactured, for example, by forming the raised portion 32 by injection molding on the base portion 30, the rigid portion 21, and the speaker box 22 that are formed by press molding. Note that the method of manufacturing the inner panel 20 is not limited to this embodiment, and the inner panel 20 may be formed by press molding, injection molding, or any other known method.

[0069] [Method for determining the shape of the raised portion 32] The raised portion 32 is formed by performing a frequency response analysis to determine the resonating portion R of the resonant mode, and then performing a topology analysis to form the shape determined by the topology analysis, which is necessary to suppress vibration of the resonating portion R. Furthermore, the raised portion 32 is formed to have a smooth shape that does not cause excessive stress concentration and that facilitates the flow of resin when the raised portion is formed by injection molding. By forming the raised portion in a smooth shape, stress concentration is alleviated, vibration of the resonating portion R is further suppressed, and the flow of resin during molding is improved.

[0070] A frequency response analysis in a resonance mode was performed on a base part model 30A, which was an analytical model created by adding the mass of the speaker device 10 as a mass point M (see FIG. 5A) to the base part 30. The mass point M is a point of mass of the speaker device 10 with respect to the Z axis, and the weight of the speaker device 10 is input to this mass point M, which is connected to the edge of the opening 38A by a rigid element.

[0071] As shown in FIG. 5A, in the first resonance mode of the base model 30A, a resonance portion R1 is formed near the opening 38A to which the speaker device 10 is attached.

[0072] As shown in FIG. 5B, in the second resonance mode of the base model 30A, a resonance portion R2 is formed on the left and right sides of the base model 30A (mainly on the right side where the speaker device 10 is not attached).

[0073] As shown in FIG. 5C, in the third-order resonance mode of the base model 30A, an obliquely inclined resonant portion R3 was formed along the diagonal line of the base model 30A.

[0074] 6, the acceleration T3 of the resonance portion R3 of the third resonance mode tends to be smaller than the acceleration T1 of the resonance portion R1 of the first resonance mode and the acceleration T2 of the resonance portion R2 of the second resonance mode. In other words, the amplitude of the resonance portion R3 of the third resonance mode tends to be smaller than the amplitude of the resonance portion R1 of the first resonance mode and the amplitude of the resonance portion R2 of the second resonance mode. That is, it can be seen that the amplitudes of the resonance portions of the third resonance mode and higher do not have a significant effect on the acoustic performance of the speaker device 10.

[0075] For this reason, in the first embodiment, the shape of the raised portion 32 was determined by topology analysis so as to suppress the resonant portion R1 in the primary resonance mode of the base portion 30 and the resonant portion R2 in the secondary resonance mode of the base portion 30. The topology analysis revealed that the raised portion 32 is preferably formed so as to surround the resonant portions R in the primary resonance mode and the secondary resonance mode of the base portion 30. It was also found that the raised portion 32 is preferably formed so as to cross the resonant portions R in the primary resonance mode and the secondary resonance mode in the minor axis direction. Furthermore, it was found that the raised portion 32 is preferably formed so as to surround the opening 38A.

[0076] [Effect Confirmation Experiment] An experiment was conducted to confirm the effect of the inner panel 20 of the first embodiment. In the experiment, an example model simulating the base portion 30 having the raised portion 32 formed thereon was prepared as an example, and a comparative example model not having the raised portion 32 formed thereon was prepared as a comparative example.

[0077] The example model was a fiber-reinforced resin plate simulating the base portion 30. The example model was a rectangular plate with a thickness of 1.5 mm. The height of the protrusion of the example model was 1.0 mm. The speaker device 10 was attached to the opening of the example model.

[0078] The comparative example model was a rectangular aluminum plate with a thickness of 1.0 mm. The speaker device 10 was attached to the opening of the comparative example model.

[0079] In the experiment, the example model and the comparative example model were placed in an anechoic chamber with their peripheries fixed, and a sweep sine input signal was input to the speaker device 10 with an input power of 1 [W]. Then, sound was collected by a microphone at a location 1 [m] away from the example model or the comparative example model. An audio sound analyzer (ASA-10mkII) manufactured by Etani Electric was used as the measuring device.

[0080] 7, the comparative example model exhibited a large dip in the frequency band of 200 Hz or less, whereas the example model did not exhibit any dip in the characteristics.

[0081] 8A and 8B are graphs showing waterfall analysis results of FFT (Fast Fourier Transform) analysis of impulse responses. It was found that the sound of the comparative model shown in Fig. 8A remained for a longer period of time than the example model shown in Fig. 8B.

[0082] [Function] The inner panel 20 of the first embodiment comprises a base portion 30 to which the speaker device 10 is attached, and a raised portion 32 formed on at least one surface of the base portion 30 by protruding in the thickness direction of the base portion 30, the raised portion 32 being formed so as to surround the resonating portion R in the resonant mode of the base portion 30 and further so as to cross the resonating portion R (see Figure 3).

[0083] The raised portion 32 is formed so as to surround the resonating portion R in the resonant mode of the base portion 30 and also so as to cross the resonating portion R, thereby suppressing vibration of the resonating portion R in the resonant mode. This reduces the effect of the resonance of the inner panel 20 on the speaker device 10. As a result, the acoustic performance of the speaker device 10 can be improved with a simple configuration.

[0084] Furthermore, by providing the protrusions 32 at predetermined positions, the vibration of the resonating portion R in the resonant mode is suppressed, which allows the thickness of the base portion 30 to be reduced, thereby making it possible to reduce the weight of the inner panel 20.

[0085] The inner panel 20 of the first embodiment has an opening 38A formed in the base portion 30 into which at least a part of the speaker device 10 is inserted, and the raised portion 32 is formed to surround the opening 38A (see Figure 3).

[0086] The raised portion 32 is formed so as to surround the opening 38A, and thus the raised portion 32 is formed at the base portion where the vibration of the speaker device 10 is transmitted to the base portion 30. Therefore, the vibration of the speaker device 10 is prevented from vibrating the base portion 30. As a result, the acoustic performance of the speaker device 10 can be improved with a simple configuration.

[0087] In the inner panel 20 of the first embodiment, the speaker device 10 is attached to the raised portion 32 (see FIG. 3).

[0088] The speaker device 10 is attached to the raised portion 32, so that the speaker device 10 is held at a portion with high rigidity. Therefore, vibration of the base portion 30 due to vibration of the speaker device 10 is further suppressed. In addition, the attachment portion of the speaker device 10 can be reinforced.

[0089] Incidentally, in the third or higher resonance mode of the base portion 30, the influence of vibration of the base portion 30 is reduced.

[0090] In the inner panel 20 of the first embodiment, the raised portion 32 is formed so as to surround the resonating portion R of the base portion 30 in the first and second resonance modes (see FIG. 3).

[0091] The raised portion 32 is formed to surround the resonating portion R in the primary and secondary resonance modes of the base portion 30, thereby suppressing vibrations in the large-amplitude resonance modes of the base portion 30. Therefore, the acoustic performance of the speaker device 10 can be improved with a simple configuration.

[0092] In the inner panel 20 of the first embodiment, the raised portion 32 connects one rigid portion 21 of the base portion 30 to another rigid portion 21 (see FIG. 1).

[0093] The raised portion 32 is connected from one rigid portion 21 of the base portion 30 to another rigid portion 21, thereby effectively suppressing vibrations transmitted from the speaker device 10 to the inner panel 20. Therefore, the acoustic performance of the speaker device 10 can be further improved with a simple configuration.

[0094] The inner panel 20 of the first embodiment is made of a material containing fiber reinforced resin.

[0095] The inner panel 20 is made of a material containing fiber-reinforced resin, which is lighter than metal, and can further improve the acoustic performance of the speaker device 10. Furthermore, the inner panel 20 can be molded as a single unit by taking advantage of the fluidity of the fiber-reinforced resin.

[0096] In the inner panel 20 of the first embodiment, the fiber reinforced resin contains reinforcing fibers having a weight average fiber length of 100 mm or less, which are randomly oriented.

[0097] The fiber reinforced resin contains reinforcing fibers with a weight average fiber length of 100 mm or less randomly oriented, which makes it possible to produce a molded product that is less susceptible to variations in physical properties due to bias or entanglement of the reinforcing fibers.

[0098] In the inner panel 20 of the first embodiment, the opening 38A is an opening of a speaker box 22 formed in a box-like shape with a bottom that accommodates at least a part of the rear side of the speaker device 10 (see FIG. 2).

[0099] The opening 38A is an opening of the speaker box 22, which is formed in a box-like shape with a bottom and accommodates at least a part of the rear side of the speaker device 10, so that the rear side of the speaker device 10 is covered by the speaker box 22. This prevents the sound emitted to the rear side of the speaker device 10 from leaking to the outside. As a result, the acoustic performance of the speaker device 10 can be further improved. Moreover, because the rear side of the speaker device 10 is covered by the speaker box 22, it is possible to control the sound pressure emitted to the rear side of the speaker device 10.

[0100] In the inner panel 20 of the first embodiment, the speaker box 22 has a reflection suppressing shape that suppresses reflection of sound emitted from the rear side of the speaker device 10 back toward the speaker device 10 (see FIG. 2).

[0101] The speaker box 22 has a reflection-suppressing shape that suppresses reflection of sound emitted from the rear side of the speaker device 10 back toward the speaker device 10, thereby suppressing the sound emitted from the rear side of the speaker device 10 from being reflected by the speaker box 22 and returning to the speaker device 10. This further improves the acoustic performance of the speaker device 10. However, if the speaker box 22 has a plane that is perpendicular to the vibration direction of the diaphragm 17 of the speaker device 10 (a plane that is equidistant from the speaker device 10), standing waves may be generated, causing resonance within the speaker box 22. In contrast, the reflection-suppressing shape of the speaker box 22 prevents waves of the same frequency from reflecting at the same distance so as not to interfere with the movement of the diaphragm 17, thereby preventing resonance within the speaker box 22.

[0102] In the vehicle interior body mounting structure of the first embodiment, the inner panel 20 is a mounting panel to which the door trim 4 is attached (see FIG. 1).

[0103] The inner panel 20 is a mounting panel to which the door trim 4 is attached, and therefore the inner panel 20 is a member to which the speaker device 10 is attached and a member to which the door trim 4 is attached. Therefore, the inner panel 20 is a member having two functions and can be configured simply.

[0104] [Second embodiment] The speaker mounting member of the second embodiment differs from the speaker mounting member of the first embodiment in that the configuration of the raised portion is different. Note that the same or equivalent parts as those described in the first embodiment will be described using the same terms or symbols.

[0105] 9, the raised portion 132 is formed by protruding from the front surface of the base portion 30 in the plate thickness direction of the base portion 30, and is also formed by protruding from the back surface of the base portion 30 in the plate thickness direction of the base portion 30. In other words, the raised portion 132 is formed on the front side and the back side of the base portion 30. The raised portion 132 formed on the front side of the base portion 30 and the raised portion 132 formed on the back side of the base portion 30 are provided at approximately the same position when viewed in the plate thickness direction of the base portion 30.

[0106] A groove 132A having a rectangular cross section is formed on the tip surface of the raised portion 132 along the extension direction of the raised portion 132. The shape of the groove is not limited to this, and may be, for example, a groove having a circular cross section formed along the extension direction of the raised portion 132.

[0107] [Operation] The weight of the raised portion 132 is reduced by forming the grooves in the raised portion 132. Therefore, the acoustic performance of the speaker device 10 can be improved while achieving a reduction in weight.

[0108] Furthermore, the raised portion 132 formed on the front surface of the base portion 30 and the raised portion 132 formed on the back surface of the base portion 30 are provided at approximately the same position when viewed in the thickness direction of the base portion 30, thereby enhancing the reinforcement of the base portion 30 by the raised portion 132. Therefore, the acoustic performance of the speaker device 10 can be further improved with a simple configuration.

[0109] The other configurations and effects are substantially the same as those of the first embodiment, and therefore will not be described further.

[0110] [Third embodiment] The speaker mounting structure 7 of the third embodiment differs from the speaker mounting member of the first embodiment in that the mounting structure of the speaker device is different. Note that the same or equivalent parts as those described in the first embodiment will be described using the same terms or symbols.

[0111] [Configuration] As shown in FIG. 10 , the speaker device 10 has a support 41 on the rear side thereof that supports the magnetic circuit 14 of the speaker device 10. The support 41 can be formed of, for example, an elastic material or a viscoelastic material. When the support 41 is formed of a viscoelastic material, the viscoelastic material can absorb impacts generated by the magnetic circuit. Note that the support is not limited to this form and may have a structure that supports the center of gravity of the speaker device 10 and has a reflection-suppressing shape that suppresses reflection of sound emitted from the rear side of the speaker device 10 back toward the speaker device 10. Furthermore, the support may have, for example, a truncated cone shape with a bottom wall 23 protruding toward the speaker device, or a shape in which the inclined surface of the truncated cone is formed by a curved surface.

[0112] [Function] The support 41 that supports the rear side of the speaker device 10 supports the magnetic circuit of the speaker device 10. Therefore, vibration of the magnetic circuit when the speaker device 10 is driven is suppressed. As a result, the acoustic performance of the speaker device 10 can be improved.

[0113] The other configurations and effects are substantially the same as those of the first embodiment, and therefore will not be described further.

[0114] [Fourth embodiment] The speaker mounting structure 7 of the fourth embodiment differs from the speaker mounting member of the first embodiment in that the mounting structure of the speaker device is different. Note that the same or equivalent parts as those described in the first embodiment will be described using the same terms or symbols.

[0115] 11 , the rear side of the speaker device 10 is provided with a diffuser 42 that prevents sound emitted toward the rear side of the speaker device 10 and reflected by the bottom wall 23 of the speaker box 22 from returning to the speaker device 10. The diffuser 42 is formed in a roughly bowl shape with a recess, and a bottom portion 42A is attached to the bottom portion 18B of the frame 18.

[0116] [Function] The rear side of the speaker device 10 is provided with the diffuser 42 that prevents the sound emitted to the rear side and reflected from returning to the speaker device 10, thereby preventing the sound emitted to the rear side of the speaker device 10 from returning to the speaker device 10. Therefore, the acoustic performance of the speaker device 10 can be improved.

[0117] The inner panel 20 does not necessarily have to include the speaker box 22. For example, the inner panel 20 may have an opening formed as a through-hole penetrating in the thickness direction, or may have a cylindrical sidewall. In such a case, sound emitted from the rear side of the speaker device 10 is reflected by the outer panel 2. Here, it is preferable to attach a diffuser 42 to the speaker device 10. This prevents the sound reflected from the outer panel 2 from returning to the speaker device 10, thereby improving the acoustic performance of the speaker device 10. Furthermore, other configurations and effects are substantially the same as those of the first embodiment, and therefore description thereof will be omitted.

[0118] Fifth Embodiment The speaker mounting structure 7 of the fifth embodiment differs from the speaker mounting member of the first embodiment in that the mounting structure of the speaker device is different. Note that the same or equivalent parts as those described in the first embodiment will be described using the same terms or symbols.

[0119] As shown in Fig. 12, the speaker mounting member includes an intermediate member 130 attached to the inner panel 20, and the inner panel 20. The intermediate member 130 is formed in a plate shape and attached so as to cover the speaker box 22. The rear side of the speaker device 10 is inserted into an opening 138A formed in the intermediate member 130 and attached. The intermediate member 130 is attached to the inner panel 20 with screws S. Note that the inner panel 20 may be made of metal and the intermediate member 130 may be used as the speaker mounting member, or the intermediate member 130 may be made of metal and the inner panel 20 may be used as the speaker mounting member. Even with this configuration, substantially the same effects as those of the first embodiment are achieved.

[0120] The present disclosure has been described above based on the first to fifth embodiments. However, the specific configurations are not limited to these embodiments, and design changes and the like are permitted as long as they do not deviate from the gist of the invention according to each claim in the scope of the claims.

[0121] In the first to fifth embodiments, the speaker mounting member is made of resin, but the material is not limited to this and may be metal such as iron or aluminum.

[0122] In the first to fifth embodiments, examples have been shown in which the raised portions 32, 132 are provided on the base portion 30. However, the raised portions may also be provided on the speaker box.

[0123] In the first to fifth embodiments, the protrusions 32, 132 are formed to cross the resonating portion R in the minor axis direction of the base portion 30. However, the protrusions may be formed to cross the resonating portion R in the major axis direction of the base portion 30, or may be formed to cross the resonating portion R in a direction inclined with respect to the major axis direction of the base portion 30.

[0124] In the first to fifth embodiments, the protruding portion 32 is formed to surround the opening 38A. However, the protruding portion may not surround the opening 38A.

[0125] In the first to fifth embodiments, examples have been shown in which the height of the raised portions is constant. However, the height of the raised portions does not have to be constant. For example, by making the height of the raised portions lower as they approach the center of the base portion, it is possible to ensure both weight reduction and rigidity.

[0126] In the first to fifth embodiments, an example has been shown in which the speaker box 22 is provided integrally with the base portion 30. However, the speaker box may be provided separately from the base portion. In this case, the speaker box may be formed of a material different from that of the base portion. Furthermore, the speaker box does not have to be provided on the base portion. In this case, the inner panel may be formed with an opening as a through-hole penetrating through the plate thickness direction, or may have a cylindrical side wall.

[0127] In the first to fifth embodiments, the raised portion 32 is formed to surround the resonating portion R1 in the primary resonance mode of the base portion 30 and the resonating portion R2 in the secondary resonance mode of the base portion 30. However, the raised portion may also be formed to surround the resonating portions in the tertiary or higher resonance modes of the base portion 30.

[0128] In the first embodiment, the speaker box 22 has a reflection suppressing shape, in the third embodiment, a support body 41 is provided on the rear side of the speaker device 10, and in the fourth embodiment, an example is shown in which a diffuser 42 is provided on the rear side of the speaker device 10. However, the speaker mounting structure does not have to include the reflection suppressing shape, the diffuser, and the support body 41, or may include at least one of the reflection suppressing shape, the diffuser, and the support body 41.

[0129] In the first to fifth embodiments, the base portion and the intermediate member have an opening into which the rear side of the speaker device 10 is inserted for attachment. However, the base portion and the intermediate member do not necessarily have to have an opening.

[0130] In the first to fifth embodiments, an example has been shown in which the speaker mounting member is attached to the door of an automobile as a mobile body. However, the speaker mounting member may be attached to an interior body of the automobile (for example, a pillar or a headlining) or to an interior body for another mobile body. The other mobile body may be a vehicle other than an automobile, such as a train or a small mobility vehicle, a ship, an aircraft, or the like.

[0131] The disclosure of Japanese Patent Application No. 2023-188833, filed on November 2, 2023, is incorporated herein by reference in its entirety.

Claims

1. A speaker mounting member comprising: a base portion to which a speaker device is attached; and a raised portion that protrudes from at least one surface of the base portion in the thickness direction of the base portion, surrounds a resonating portion in a resonant mode of the base portion, and is formed so as to cross the resonating portion.

2. The speaker mounting member according to claim 1, further comprising an opening formed in said base portion into which at least a part of said speaker device is inserted, and said raised portion is formed so as to surround said opening.

3. The speaker mounting member according to claim 2, wherein the speaker device is mounted on the raised portion.

4. A speaker mounting member as claimed in claim 1, wherein the raised portion is formed so as to surround a resonating portion of the base portion in a primary resonance mode and a secondary resonance mode.

5. The speaker mounting member according to claim 1, wherein the raised portion has a groove formed therein.

6. A speaker mounting member as described in claim 1, wherein the raised portion formed on the front surface of the base portion and the raised portion formed on the rear surface of the base portion are provided at approximately the same position when viewed in the thickness direction of the base portion.

7. The speaker mounting member according to claim 1, wherein the raised portion is connected from one rigid portion of the base portion to another rigid portion.

8. The speaker mounting member according to claim 1, which is made of a material containing fiber-reinforced resin.

9. The speaker mounting member according to claim 8, wherein the fiber reinforced resin contains reinforcing fibers having a weight average fiber length of 100 mm or less, which are randomly oriented.

10. A speaker mounting member as described in claim 1, further comprising an opening formed in the base portion into which at least a part of the speaker device is inserted, the opening being an opening of a speaker box shaped like a bottomed box that houses at least a part of the rear side of the speaker device.

11. The speaker mounting member according to claim 10, wherein the speaker box has a reflection suppressing shape that suppresses reflected sound directed toward the speaker device.

12. A speaker mounting structure comprising: a speaker mounting member as claimed in any one of claims 1 to 11; and a speaker device mounted in an opening formed in the base portion into which at least a part of the speaker device is inserted, wherein the speaker mounting member is a body panel of a mobile body, an intermediate member mounted to the body panel, or both the body panel and the intermediate member.

13. The speaker mounting structure according to claim 12, further comprising a support for supporting the rear side of the speaker device.

14. The speaker mounting structure according to claim 12, further comprising a diffuser on the rear side of the speaker device for preventing sound emitted to the rear side and reflected from returning to the speaker device.

15. A mounting structure for an interior body of a moving body, comprising the speaker mounting structure according to claim 12, wherein the speaker mounting member is a mounting panel for mounting an interior body of a moving body.

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