JP7748601B2 - Speaker mounting member, speaker mounting structure, and interior body mounting structure for mobile body - Google Patents

Description

This disclosure relates to a speaker mounting member, a speaker mounting structure, and an interior body mounting structure for a vehicle.

Jitto Publication No. 2599532 discloses a technology in which a steel bracket with a speaker driver unit attached is attached to the inner body of a vehicle via a closed-cell resin such as butyl resin.

However, it is preferable for speaker mounting members to have a simple configuration while improving the acoustic performance of the speaker device.

The present disclosure takes into consideration the above facts and aims to improve the acoustic performance of a speaker device with a simple configuration.

The speaker mounting member of the first aspect of the present disclosure comprises a base portion on which a speaker device is mounted, 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 the resonant mode of the base portion, and is further formed so as to cross the resonating portion.

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

The speaker mounting member of the 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 to the raised portion.

A speaker mounting member of the 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.

The speaker mounting member of the fifth aspect of the present disclosure is a 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.

The speaker mounting member of the 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 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 in the thickness direction of the base portion.

The speaker mounting member of the 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.

The speaker mounting member of the eighth aspect of the present disclosure is a 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.

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

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 portion of the speaker device is inserted, the opening being an opening in a speaker box shaped like a bottomed box that accommodates at least a portion of the rear side of the speaker device.

The speaker mounting member of the 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.

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, wherein 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.

The speaker mounting structure of the thirteenth aspect of the present disclosure is the speaker mounting structure of the twelfth aspect of the present disclosure, which is provided with a support body that supports the rear side of the speaker device.

The speaker mounting structure of the 14th aspect of the present disclosure is a speaker mounting structure of the 12th or 13th aspect of the present disclosure, which is provided with a diffuser on the rear side of the speaker device that prevents sound emitted to the rear side and reflected from returning to the speaker device.

The interior body mounting structure for a vehicle of the 15th aspect of the present disclosure includes a speaker mounting structure of any one of the 12th to 14th aspects of the present disclosure, and the speaker mounting member is a mounting panel for mounting the interior body for a vehicle.

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 is formed to cross the resonating portion, thereby suppressing vibration of the resonating portion in the resonant mode. This reduces the impact of 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.

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 at the base where vibrations are transmitted from the speaker device to the base. This prevents the base from vibrating due to vibrations from the speaker device. As a result, the acoustic performance of the speaker device can be improved with a simple configuration.

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 in a highly rigid portion. This prevents the base portion from vibrating due to vibrations from the speaker device.

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 and secondary resonance modes, thereby suppressing vibrations of the base portion in the resonance modes with large amplitudes. This allows for improved acoustic performance of the speaker device with a simple configuration.

In the speaker mounting member of the fifth aspect of the present disclosure, grooves are formed in the raised portion, thereby reducing weight. This allows for weight reduction while improving the acoustic performance of the speaker device.

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. This allows for further improvement in the acoustic performance of the speaker device with a simple configuration.

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. Therefore, the acoustic performance of the speaker device can be further improved with a simple configuration.

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.

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, resulting in a molded body that is less susceptible to variations in physical properties due to bias or entanglement of the reinforcing fibers.

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 houses 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. As a result, the acoustic performance of the speaker device can be improved.

In the speaker mounting member of the eleventh aspect of the present disclosure, the speaker box has a bottom wall facing the rear of the speaker device that has a reflection-suppressing shape, which prevents sound emitted toward the rear of the speaker device and reflected from returning to the speaker device. This further improves the acoustic performance of the speaker device.

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 resulting in a speaker mounting structure that improves the acoustic performance of the speaker device.

In the speaker mounting structure of the thirteenth aspect of the present disclosure, a support is provided that supports the rear side of the speaker device, thereby supporting the magnetic circuit of the speaker device. This suppresses vibration of the magnetic circuit when the speaker device is driven. As a result, the acoustic performance of the speaker device can be improved.

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 sound emitted to the rear side of the speaker device from returning to the speaker device. This improves the acoustic performance of the speaker device.

In the vehicle interior body mounting structure of the fifteenth aspect of the present disclosure, the speaker mounting member is a mounting panel to which the vehicle interior body is attached, and the speaker mounting member is a member to which the speaker device is attached and a member to which the vehicle interior body is attached. Therefore, the speaker mounting member is a member with two functions, allowing for a simple configuration.

According to the present disclosure, the acoustic performance of a speaker device can be improved with a simple configuration.

1 is a cross-sectional view showing a vehicle door structure according to a first embodiment. 1 is a cross-sectional view showing a speaker device mounting structure according to a first embodiment. FIG. 2 is a front view schematically showing the inner panel according to the first embodiment. 4 is a cross-sectional view showing the inner panel according to the first embodiment, taken along line AA in FIG. 3. 10 is a graph showing the results of frequency response analysis in a resonance mode for an analytical model of a base portion, illustrating the analysis results of a primary resonance mode. 10 is a graph showing the results of frequency response analysis in a resonance mode for an analytical model of a base portion, illustrating the analysis results of a second-order resonance mode. 10 is a graph showing the results of a frequency response analysis in a resonance mode for an analytical model of a base portion, illustrating the analysis results of a third-order resonance mode. 10 is a graph showing the results of a response analysis performed on an analytical model of the base portion, in terms of the relationship between frequency and acceleration. 10 is a graph showing the results of sound pressure frequency measurements carried out on an example and a comparative example. 10 is a graph showing a comparative example in which the results of FFT analysis of impulse responses are subjected to waterfall analysis. 10 is a graph showing a waterfall analysis of the results of FFT analysis of an impulse response, and shows a graph of an example. FIG. 10 is a cross-sectional view showing an inner panel according to a second embodiment. FIG. 10 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 fourth embodiment. FIG. 10 is a cross-sectional view showing a speaker mounting structure according to a fifth embodiment.

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.

[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.

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.

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 forms the mounting panel to which the door trim 4 is attached.

[Configuration of speaker device 10]
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.

A bobbin 15 wound with a voice coil 15A is connected to the inner edge of the diaphragm 17, so that the vibrations of the bobbin 15 are transmitted. The outer edge of the diaphragm 17 is attached to the flange portion 18A of the frame 18.

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 the magnetic gap G of the magnetic circuit 14.

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, the electromagnetic force excited by the magnetic flux and the drive current causes the diaphragm 17 to vibrate via the bobbin 15, and sound is radiated in front of and behind the diaphragm 17.

[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.

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.

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

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

Inorganic fibers include, for example, carbon fibers, activated carbon fibers, graphite fibers, glass fibers, tungsten 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. Organic fibers include, for example, 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.

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 stage in the production of the inner panel 20.

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 bodies obtained by the methods described in International Publication No. 2007/020910 or International Publication No. 2012/165418, is preferred as it has excellent physical properties and can be easily reused (remolded) when no longer needed.

If it is desired to specifically define the two-dimensional random orientation of the reinforcing fibers contained in fiber-reinforced resin molding materials or molded bodies, as shown in JP 2012-246428 A, a preferred two-dimensional random orientation can be defined as a state in which the reinforcing fibers have a planar orientation degree σ of 90% or more, defined as 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)).

Reinforcing fibers with a weight-average fiber length of 100 mm or less are preferred, as this results in a molded product 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.

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

(Base portion 30)
The base plate 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 30 is formed in a rectangular plate shape with its major axis aligned in the vehicle longitudinal direction and its minor axis aligned in the vehicle vertical direction. The plate thickness of the base plate 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 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 30 may be provided with an opening such as a service hole.

As shown in Figures 3 and 4, the base portion 30 has a raised portion 32 that protrudes in a generally rectangular shape from the front surface (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 formed by protruding 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.

The raised portion 32 comprises a first raised portion 33, a second raised portion 34, a third raised portion 35, and a fourth raised portion 36.

The first raised portions 33 are formed near the outer peripheral edge of the base portion 30. The first raised portions 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 raised portions 33 formed to extend in the minor axis direction of the base portion 30 are connected to rigid portions 21 (see Figure 1), which are described below and are formed above and below the base portion 30.

The second raised portions 34 are formed to connect the first raised portions 33 extending in the minor axis direction of the base portion 30. The second raised portions 34 are formed to connect the first raised portions 33 extending in the major axis direction of the base portion 30. The second raised portions 34 are formed to surround the resonant portion R in the resonance mode of the base portion 30. The resonant portion R is the 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 resonant portion R is the antinode of the displacement amplitude where the amplitude in the resonance mode is large, and is the portion of the base portion 30 where the amplitude in the thickness direction is large. When the second raised portions 34 are formed in a substantially rectangular shape to surround 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 volume of the second raised portions 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 .

The third raised portion 35 is formed to connect the first raised portions 33 extending in the minor axis direction of the base portion 30. The third raised portion 35 is formed to cross the resonating portion R in the minor axis direction of the base portion 30.

The fourth raised portion 36 is formed in a circular shape surrounding the opening 38A. The speaker device 10 may be attached to the base portion 30 by contacting the flange portion 18A of the frame 18 with the fourth raised portion 36.

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

The rigid portion 21 formed at the upper end of the base portion 30 is formed so as to curve outward in the vehicle width direction. The rigid portion 21 formed at the lower end of the base portion 30 is formed so as to bend outward in the vehicle width direction. The raised portion 32 is formed so as 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.

(Speaker box 22)
2, the speaker box 22 is formed into a box shape with a bottom and an open inner surface in the vehicle width direction by side walls 24 and a bottom wall 23. 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.

The side wall 24 is 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 wall 24 in the vehicle width direction. Note that the side wall 24 may be formed in a cylindrical shape, but it is preferable that it be formed in a rectangular cylindrical shape from the perspective of suppressing radial resonance.

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

As a reflection-suppressing shape, the bottom wall 23 may be inclined relative to the longitudinal direction of the vehicle, the bottom wall 23 or the side walls 24 may be provided with an uneven shape, or the bottom wall 23 may be rounded, including spherical or rugby ball-shaped. As a reflection-suppressing shape, the side walls 24 may be inclined relative to the width direction of the vehicle, or the speaker box may be formed into a cone shape.

[Method of manufacturing the 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 manufacturing method of 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.

[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 a shape determined by the topology analysis that 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.

A frequency response analysis in resonant mode was performed on base model 30A, which was created by adding the mass of the speaker device 10 as mass point M (see Figure 5A) to the base 30. Mass point M is the mass point of the speaker device 10 relative to the Z axis, and the weight of the speaker device 10 was input to mass point M, which is connected to the edge of the opening 38A by a rigid element.

As shown in Figure 5A, in the first resonance mode of the base model 30A, a resonance portion R1 is formed near the opening 38A where the speaker device 10 is attached.

As shown in Figure 5B, in the second-order resonance mode of the base model 30A, a resonance portion R2 was 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).

As shown in Figure 5C, in the third-order resonance mode of the base model 30A, a diagonally inclined resonance portion R3 was formed along the diagonal line of the base model 30A.

Here, as shown in Figure 6, the acceleration T3 of the resonance portion R3 of the third-order resonance mode tends to be smaller than the acceleration T1 of the resonance portion R1 of the first-order resonance mode and the acceleration T2 of the resonance portion R2 of the second-order resonance mode. In other words, the amplitude of the resonance portion R3 of the third-order resonance mode tends to be smaller than the amplitude of the resonance portion R1 of the first-order resonance mode and the amplitude of the resonance portion R2 of the second-order resonance mode. In other words, it can be seen that the amplitude of the resonance portions of the third-order resonance mode and higher does not have a significant impact on the acoustic performance of the speaker device 10.

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 it is preferable for the raised portion 32 to be formed so as to surround the resonant portion R in the primary resonance mode and the secondary resonance mode of the base portion 30. It was also found that it is preferable for the raised portion 32 to be formed so as to intersect the resonant portion R in the minor axis direction in the primary resonance mode and the secondary resonance mode. Furthermore, it was found that it is preferable for the raised portion 32 to be formed so as to surround the opening 38A.

[Effectiveness verification 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.

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 raised portion of the example model was 1.0 mm. A speaker device 10 was attached to the opening of the example model.

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

In the experiment, the example model and the comparative example model were placed in an anechoic chamber with their edges fixed, and a sweep sine input signal was input to the speaker device 10 with an input power of 1 W. Sound was then collected using a microphone 1 m away from the example model or the comparative example model. The measuring device used was an audio sound analyzer (ASA-10mkII) manufactured by Etani Electric.

As shown in Figure 7, the comparative example model exhibited a large dip in the frequency band below 200 Hz. On the other hand, the example model did not exhibit any characteristic dip.

Furthermore, Figures 8A and 8B are graphs showing waterfall analysis results of FFT (Fast Fourier Transform) analysis of impulse responses. It was found that the comparative model shown in Figure 8A retains sound for a longer period of time than the example model shown in Figure 8B.

[Effect]
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).

The raised portion 32 is formed to surround the resonating portion R in the resonant mode of the base portion 30 and also to cross the resonating portion R, thereby suppressing vibration of the resonating portion R in the resonant mode. This reduces the impact 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.

Furthermore, by providing the raised portion 32 at a predetermined position, the vibration of the resonating portion R in the resonant mode is suppressed, allowing the thickness of the base portion 30 to be reduced. This also allows for the weight of the inner panel 20 to be reduced.

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

The raised portion 32 is formed to surround the opening 38A, so that the raised portion 32 is formed at the base where vibrations from the speaker device 10 are transmitted to the base portion 30. This prevents vibrations from the speaker device 10 that cause the base portion 30 to vibrate. As a result, the acoustic performance of the speaker device 10 can be improved with a simple configuration.

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

By attaching the speaker device 10 to the raised portion 32, the speaker device 10 is held in a highly rigid portion. This further reduces vibration of the base portion 30 due to vibration of the speaker device 10. This also reinforces the mounting location of the speaker device 10.

However, in the third-order resonance mode or higher of the base portion 30, the influence of vibration of the base portion 30 is reduced.

In the inner panel 20 of the first embodiment, the raised portion 32 is formed to surround the resonant portion R in the primary and secondary resonant modes of the base portion 30 (see Figure 3).

The raised portion 32 is formed to surround the resonant portion R of the base portion 30 in the primary and secondary resonance modes, thereby suppressing vibrations of the base portion 30 in the large-amplitude resonance modes. This allows for improved acoustic performance of the speaker device 10 with a simple configuration.

In the first embodiment of the inner panel 20, the raised portion 32 is connected from one rigid portion 21 of the base portion 30 to another rigid portion 21 (see Figure 1).

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. This allows for a simple configuration to further improve the acoustic performance of the speaker device 10.

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

By making the inner panel 20 from a material containing fiber-reinforced resin, the material is lighter than metal, further improving 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.

In the first embodiment, the inner panel 20 is made of fiber-reinforced resin in which reinforcing fibers with a weight-average fiber length of 100 mm or less are randomly oriented.

The fiber-reinforced resin contains reinforcing fibers with a weight-average fiber length of 100 mm or less randomly oriented, resulting in a molded product that is less susceptible to variations in physical properties due to bias or entanglement of the reinforcing fibers.

In the inner panel 20 of the first embodiment, the opening 38A is an opening in a speaker box 22 formed in the shape of a bottomed box that accommodates at least a portion of the rear side of the speaker device 10 (see Figure 2).

The opening 38A is an opening in the speaker box 22, which is formed in a box-like shape with a bottom and which accommodates at least a portion 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 sound emitted from 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 from the rear side of the speaker device 10.

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 Figure 2).

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. This prevents 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 perpendicular to the vibration direction of the diaphragm 17 of the speaker device 10 (a plane equidistant from the speaker device 10), standing waves may be generated, causing resonance within the speaker box 22. In contrast, the speaker box 22's reflection-suppressing shape 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.

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

The inner panel 20 is an attachment 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, as well as a member to which the door trim 4 is attached. Therefore, the inner panel 20 is a member with two functions and can be configured simply.

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.

[composition]
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.

A groove 132A with 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 with a circular cross section formed along the extension direction of the raised portion 132.

[Effect]
The weight of the raised portion 132 is reduced by forming the grooves therein, and therefore the acoustic performance of the speaker device 10 can be improved while reducing the weight.

In addition, 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 located at approximately the same position when viewed from the thickness direction of the base portion 30, thereby strengthening 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.

Note that other configurations and effects are substantially the same as those of the first embodiment described above, so explanations will be omitted.

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.

[composition]
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 is formed by a curved surface.

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

Note that other configurations and effects are substantially the same as those of the first embodiment described above, so explanations will be omitted.

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.

[composition]
11 , the rear side of the speaker device 10 is provided with a diffuser 42 that prevents sound emitted to 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.

[Effect]
The rear side of the speaker device 10 is provided with a 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. This makes it possible to improve the acoustic performance of the speaker device 10.

The inner panel 20 does not have to have a 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 side wall. 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 reflected 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, so description thereof will be omitted.

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.

As shown in FIG. 12, the speaker mounting member is made up of 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 is 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 described above are achieved.

The present disclosure has been described above based on the first to fifth embodiments. However, the specific configuration is not limited to these embodiments, and design changes are permitted as long as they do not deviate from the gist of the invention as defined in each claim.

In the first to fifth embodiments, the speaker mounting member is shown as being made of resin. However, the material of the speaker mounting member is not limited to this, and it can also be made of metal such as iron or aluminum.

In the first to fifth embodiments, the raised portions 32, 132 are shown as being provided on the base portion 30. However, the raised portions may also be provided on the speaker box.

In the first to fifth embodiments, the raised portions 32, 132 are formed to cross the resonating portion R in the minor axis direction of the base portion 30. However, the raised portions 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 relative to the major axis direction of the base portion 30.

In the first to fifth embodiments, the raised portion 32 is formed to surround the opening 38A. However, the raised portion may not surround the opening 38A.

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

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 from 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, for example, an opening as a through-hole that penetrates in the thickness direction of the plate, or may have a cylindrical side wall.

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.

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, a diffuser 42 is provided on the rear side of the speaker device 10. However, the speaker mounting structure may not include the reflection-suppressing shape, diffuser, and support body 41, or may include at least one of the reflection-suppressing shape, diffuser, and support body 41.

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

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 also be attached to the interior body of the automobile (e.g., a pillar or headlining), or to the interior body of another mobile body. The other mobile body may be a vehicle other than an automobile, such as a train or small mobility vehicle, a ship, an aircraft, etc.

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

Claims (17)

a base portion on which a speaker device is attached;
a raised portion that is raised on at least one surface of the base portion in a 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;
Equipped with
The resonance portion is an antinode of a displacement amplitude in the resonance mode, and
the raised portion is formed to surround the resonating portion of the base portion in a first resonance mode and a second resonance mode.
Speaker mounting parts. an opening formed in the base portion into which at least a part of the speaker device is inserted;
The speaker mounting member according to claim 1 , wherein the raised portion is formed so as to surround the opening. The raised portion constitutes a part of the resonating portion.
The speaker mounting member according to claim 1 . the raised portion is formed only on a portion of the base portion that surrounds the resonating portion and a portion that crosses the resonating portion.
The speaker mounting member according to claim 1 . The inner panel is located between an outer panel that forms an outer surface of the vehicle door and a door trim that forms an inner surface of the vehicle door in the thickness direction of the vehicle door.
The speaker mounting member according to claim 1 . The speaker mounting member according to claim 2 , wherein the speaker device is mounted on the raised portion. The speaker mounting member according to claim 1 , wherein the raised portion has a groove formed therein. The speaker mounting member according to claim 1 , wherein 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 in the thickness direction of the base portion. 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 of the base portion. The speaker mounting member according to claim 1 , which is made of a material containing fiber-reinforced resin. The speaker mounting member according to claim 10 , wherein the fiber reinforced resin contains reinforcing fibers having a weight average fiber length of 100 mm or less, randomly oriented. an opening formed in the base portion into which at least a part of the speaker device is inserted;
The speaker mounting member according to claim 1 , wherein the opening is an opening of a speaker box formed in a box-like shape with a bottom and accommodating at least a part of a rear side of the speaker device. The speaker mounting member according to claim 12 , wherein the speaker box has a reflection suppressing shape that suppresses reflected sound directed toward the speaker device. The speaker mounting member according to any one of claims 1 to 13 ;
a speaker device attached to an opening formed in the base portion and into which at least a part of the speaker device is inserted,
The speaker mounting structure, wherein the speaker mounting member is a body panel of a mobile body, an intermediate member attached to the body panel, or the body panel and the intermediate member. The speaker mounting structure according to claim 14 , further comprising a support body that supports a rear side of the speaker device. The speaker mounting structure according to claim 14 , further comprising a diffuser provided on the rear side of the speaker device, the diffuser preventing sound emitted to the rear side and reflected from returning to the speaker device. A speaker mounting structure according to claim 14 ,
The speaker mounting member is a mounting panel for mounting the interior body for a mobile body.