Vibration generating device

Abstract

To provide a vibration generation device which can be suppressed in the occurrence of resonance.SOLUTION: A vibration generation device 1 is provided, comprising: a vibration generation unit having a first output unit that outputs vibration corresponding to a low frequency range; a vibration transmission member 60 having one end fixed to a vehicle header panel 86 and having the other end attached to the vibration generation unit, and transmitting the vibration of the first output unit of the vibration generation unit to a header panel 86 and; an elastic deformation member 70 that elastically deforms according to the vibration of the vibration transmission member 60, the elastic deformation member 70 is coupled to the vibration generation unit and a ceiling member in the vehicle compartment of the vehicle 80.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vibration generating device.

Background Art

[0002] Patent Document 1 discloses a speaker device using an interior panel on the ceiling of a vehicle as a diaphragm. Regarding the configuration of the speaker device of Patent Document 1, in the "Means for Solving the Problem" in the abstract of Patent Document 1, it is described that "an interior panel 1 made of a foamed member formed on the back side of the skin facing the passenger compartment of the vehicle, a screw portion 32 having screws formed on the outer surface of the cylindrical body, a bracket 3 provided with a flange portion 31 at one end of the cylindrical body, and an exciter 10 provided with a coupler member 46 connected to the screw portion 32 of the bracket 3. The coupler member 46 is composed of a vibration input portion 46B connected to the vibration generating portion of the exciter 10, a vibration output portion 46C attached to the screw portion 32 of the bracket 3, and an arm portion connecting the vibration input portion 46B and the vibration output portion. With this coupler member 46, it is a speaker device using an interior panel as a diaphragm that vibrates the interior panel at a position away from the interior panel directly below the exciter 10."

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, there is a problem that the bracket 3 may resonate due to the shaking of the vehicle during travel or the vibration generated by the exciter 10, and the sound quality may change due to the resonance.

[0005] An object of the present invention is to provide a vibration generating device capable of suppressing the occurrence of resonance.

Means for Solving the Problem

[0006] One aspect of the present invention includes a vibration generating unit having a first output unit that outputs vibrations corresponding to the low frequency range, a vibration transmission member having one end fixed to the header panel of a vehicle and the vibration generating unit attached to the other end, the vibration of the first output unit of the vibration generating unit being transmitted to the header panel, and an elastically deformable member that elastically deforms in response to the vibration of the vibration transmission member. The elastically deformable member is coupled to the vibration generating unit and the ceiling member inside the vehicle compartment of the vehicle. , the vibration transmission member is in surface contact with the header panel of the vehicle on a plurality of surfaces It is a vibration generating device characterized by the above.

Advantages of the Invention

[0007] According to the present invention, the occurrence of resonance can be suppressed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a vehicle 80 to which a vibration generating device 1 according to the present embodiment is attached. FIG. 2 is a diagram schematically showing a cross-sectional configuration on the ceiling side of the vehicle 80. Note that the cross-section in FIG. 2 is a cross-section obtained by cutting the vehicle 80 along a plane including the vehicle height direction Da and the vehicle width direction Dc of the vehicle 80. Also, FIG. 2 is merely a schematic diagram, the fixing structure of each member is appropriately omitted, and the relative sizes of each member are also appropriately changed. Also, hereinafter, the vehicle height direction Da is defined as the vertical direction.

[0010] As shown in FIG. 1, the vehicle 80 is an automobile including a roof panel 81R which is an outer plate constituting the roof, a front windshield 82F which is a window material at the front, and a pair of A-pillars 83 which support both sides in the vehicle width direction Dc of the front windshield 82F. As shown in FIG. 2, the vehicle 80 further includes an interior material 84 which is one of the ceiling members constituting the ceiling of the passenger compartment. The interior material 84 is also referred to as a headliner, faces the passenger compartment space Sb, and is provided with a gap from the roof panel 81R. Hereinafter, the space between the roof panel 81R and the interior material 84 is referred to as the ceiling back space Sa. In this ceiling back space Sa, the upper edge 85U of the opening 85 into which the front windshield 82F is fitted is located, and a header panel 86 is disposed in this ceiling back space Sa. The header panel 86 is one of the reinforcing members for reinforcing the roof panel 81R, and is a long plate-shaped member formed of a metal material. Such a header panel 86 extends in the vehicle width direction Dc along the upper edge 85U of the opening 85, and both ends are fixed to a pair of A-pillars 83.

[0011] FIG. 3 is a diagram schematically showing the longitudinal cross-sectional configuration on the ceiling side of the vehicle 80. Note that the longitudinal cross-section in the figure is a cross-section obtained by cutting the vehicle 80 along a plane including the vehicle height direction Da and the overall length direction Db of the vehicle 80. As shown in FIG. 3, in the longitudinal cross-section of the vehicle 80, the header panel 86 has a substantially L-shaped cross-section in which the rear side of the vehicle 80 is bent toward the roof panel 81R side. That is, the header panel 86 includes a main surface 86A facing the roof panel 81R and an inclined surface 86B that extends from the rear of the main surface 86A toward the roof panel 81R side while being inclined with respect to the vehicle height direction Da. The header panel 86 reinforces the upper edge 85U of the opening 85 by fixing the tip 86A1 of the main surface 86A to the upper edge 85U of the opening 85 by welding or the like, and the upper end 86B1 of the inclined surface 86B is fixed to the roof panel 81R by an adhesive or the like.

[0012] As shown in FIG. 3, the vibration generating device 1 receives an acoustic signal output from a sound source device 90 provided in the vehicle 80, and generates a low-frequency sound (hereinafter simply referred to as "low sound") and a high-frequency sound (hereinafter simply referred to as "high sound") in the passenger compartment space Sb in the passenger compartment by vibrating based on the acoustic signal. The vibration generating device 1 of the present embodiment is attached to the header panel 86 in the ceiling space Sa and is coupled to the interior material 84 which is the ceiling member.

[0013] FIG. 4 is a perspective view showing the configuration of the vibration generating device 1. As shown in the figure, the vibration generating device 1 includes an exciter 2 which is a vibration generating unit that outputs vibrations based on the acoustic signal, a vibration transmission member 60 that transmits the vibrations of the exciter 2 to the header panel 86, and an elastic deformation member 70 that couples the exciter 2 and the interior material 84.

[0014] [Exciter] FIG. 5 is a perspective view showing the configuration of the exciter 2, and FIG. 6 is a cross-sectional view of the exciter 2. As shown in FIG. 5, the exciter 2 includes two vibration units: a first vibration unit 10 which is a first output unit that outputs vibrations corresponding to low sounds based on the acoustic signal, and a second vibration unit 20 which is a second output unit that outputs vibrations corresponding to high frequencies.

[0015] Such an exciter 2 transmits the vibration of the first vibrating part 10 to the header panel 86 through the vibration transmission member 60, causing the roof panel 81R and the windshield 82F connected to the header panel 86 to vibrate as diaphragms, which are the main components of the speaker device, and output bass to the passenger compartment space Sb. In addition to this, the exciter 2 also transmits the vibration of the first vibrating part 10 to the interior material 84 through the elastic deformation member 70, and the interior material 84 vibrates as a diaphragm due to this vibration to also output bass.

[0016] Also, as shown in FIG. 4, the interior material 84 of the vehicle 80 has a hole portion 84K formed therein that communicates the ceiling back space Sa and the passenger compartment space Sb, and the exciter 2 radiates high-frequency sounds from the hole portion 84K to the passenger compartment space Sb due to the vibration of the second vibrating part 20. Thereby, sounds in a wide frequency band from the bass range to the high-frequency range are reproduced in the passenger compartment space Sb.

[0017] As shown in FIG. 5, in the exciter 2 of the present embodiment, the first vibrating part 10 and the second vibrating part 20 are arranged vertically. Specifically, the exciter 2 has a bottomed cylindrical frame 4 having a bottom surface portion 4A, and a damper 5 provided on the side of the open end portion (hereinafter referred to as the upper end portion 4B) of the frame 4. The first vibrating part 10 is arranged on the top surface side of the frame 4 via the damper 5, and the second vibrating part 20 is arranged on the bottom surface portion 4A of the frame 4, whereby the first vibrating part 10 and the second vibrating part 20 are arranged vertically.

[0018] As shown in FIG. 6, the first vibrating part 10 includes a first vibrating body 12 and a first voice coil bobbin 13, and the first vibrating body 12 is internally provided in the frame 4 via the damper 5. The first vibrating body 12 includes a first yoke 14 made of a magnetic material, a disc-shaped first magnet 15, and a disc-shaped first metal plate 16 made of a metal material, and these constitute a magnetic circuit. The first yoke 14 has a circular top surface portion 14A and a cylindrical side wall portion 14B, forming a covered cylindrical shape. The first magnet 15 is adhered to the top surface 14A1 of the top surface portion 14A with an adhesive, and the first metal plate 16 is adhered to the first magnet 15 with an adhesive so as to be laminated thereon. The diameters of both the first magnet 15 and the first metal plate 16 are sized to form a gap between them and the side wall portion 14B of the first yoke 14, and a first magnetic gap g1 of the magnetic circuit is formed by this gap.

[0019] The first vibrating body 12 has dampers 5 connected to the outer peripheral surface 14B1 and the open-side end portion 14B2 of the side wall portion 14B of the first yoke 14 respectively, and the first vibrating body 12 is elastically supported on the top surface side of the frame 4 by these dampers 5. Each of the dampers 5 is a plate-shaped member made of metal having a rigidity capable of supporting the first vibrating body 12, and is configured to be able to transmit the vibration of the first vibrating body 12 to the frame 4 without reducing it as much as possible. The damper 5 of the present embodiment is provided, for example, with a number of slit holes 5A (Fig. 5) of an appropriate shape for enhancing its own elasticity in the plane of a thin plate-shaped base material made of stainless steel.

[0020] The first voice coil bobbin 13 is a cylindrical member installed inside the frame 4 and is formed of a material with high thermal conductivity (for example, metal). One end 13A of the first voice coil bobbin 13 is fixed to a recess 24D of a second yoke 24 provided in a second vibrating body 22 described later, and a first voice coil 17 through which an acoustic signal flows is wound around the outer peripheral surface of the other end 13B. By extending the other end 13B to the vicinity of the first vibrating body 12, the first voice coil 17 is disposed within the first magnetic gap g1 of the first vibrating body 12.

[0021] In the first vibrating part 10 configured as described above, when an acoustic signal flows through the first voice coil 17, a Lorentz force corresponding to the acoustic signal is generated between the first voice coil 17 and the first vibrating body 12, causing the first voice coil 17 and the first vibrating body 12 to vibrate. The vibration of the first vibrating body 12 is transmitted to the frame 4 via the damper 5, and the vibration is then transmitted to the vibration transmission member 60 to which the frame 4 is fixed. The vibration of the vibration transmission member 60 is transmitted to the roof panel 81R and the windshield 82F through the header panel 86, and the roof panel 81R and the windshield 82F vibrate as diaphragms to output bass to the passenger compartment space Sb. Further, the vibration of the vibration transmission member 60 is transmitted to the interior material 84 through the elastic deformation member 70, and the interior material 84 vibrates as a diaphragm to also output bass to the passenger compartment space Sb.

[0022] A circular opening 6 is formed in the bottom surface portion 4A of the frame 4, and the second vibrating part 20 is disposed in this opening 6. The second vibrating part 20 includes a second vibrating body 22, a second voice coil bobbin 23, and a vibrating member 21.

[0023] The second vibrating body 22 is a member provided inside the frame 4 and includes a second yoke 24 made of a magnetic material with high thermal conductivity (iron in this embodiment), a disk-shaped second magnet 25, and a disk-shaped second metal plate 26 made of a metal material. These constitute a magnetic circuit. The second yoke 24 has a dish shape with a circular top surface portion 24A, a cylindrical side wall portion 24B, and an annular flange portion 24C. A recess 24D that is recessed inside the frame 4 (on the side of the bottom surface portion 4A) is formed by the top surface portion 24A and the side wall portion 24B. On the top surface 24A1 of the top surface portion 24A of the second yoke 24, the second magnet 25 is adhered with an adhesive, and the second metal plate 26 is adhered with an adhesive so as to be laminated on the second magnet 25. The diameters of the second magnet 25 and the second metal plate 26 are sized to form a gap between them and the side wall portion 24B of the second yoke 24, and a second magnetic gap g2 of the magnetic circuit is formed by this gap.

[0024] The second yoke 24 has a flange portion 24C adhesively bonded to the frame 4 such that the recess 24D covers the opening 6 of the bottom surface portion 4A from the inside of the frame 4. As a result, the second vibrating body 22 is disposed at a position inside the frame 4 facing the opening 6. One end 13A of the cylindrical first voice coil bobbin 13 provided in the first vibrating portion 10 is fitted into the cylindrical recess 24D of the second yoke 24, and the second yoke 24 and the first voice coil bobbin 13 are fixed with an adhesive. According to this fixing structure, since the position of the first voice coil bobbin 13 is determined by the position of the second yoke 24, it becomes easy to position the first voice coil bobbin 13.

[0025] An edge 7 is provided at the opening edge of the opening 6. The edge 7 is a member for attaching the vibrating member 21 to the frame 4 without significantly reducing the vibration of the vibrating member 21. The edge 7 forms an annular shape surrounding the opening 6 and is fixed to the bottom surface portion 4A of the frame 4. The vibrating member 21 of the second vibrating portion 20 and the second voice coil bobbin 23 are both connected to the edge 7.

[0026] The second voice coil bobbin 23 is a cylindrical member. One end 23A is connected to the edge 7, and a second voice coil 27 through which an acoustic signal flows is wound around the outer peripheral surface of the other end 23B. The second voice coil bobbin 23 has the other end 23B extending to the vicinity of the second vibrating body 22, so that the second voice coil 27 is disposed in the second magnetic gap g2 of the magnetic circuit of the second vibrating body 22.

[0027] The vibrating member 21 is a member used for the dome portion of a speaker dedicated to high-frequency output (i.e., a tweeter), and is, for example, a dome-shaped member made of silk. The vibrating member 21 is connected to the edge 7 so as to cover the opening 6 from the outside of the frame 4. Note that the material of the vibrating member 21 may be other than silk.

[0028] In the second vibrating part 20 with such a configuration, when an acoustic signal flows through the second voice coil 27, a Lorentz force corresponding to the acoustic signal is generated between the second voice coil 27 and the second vibrating body 22, causing the second voice coil 27 and the second vibrating body 22 to vibrate. The vibration of the second voice coil 27 is transmitted to the vibrating member 21 via the second voice coil bobbin 23, so that the acoustic signal is converted into air vibration (physical vibration) by the vibration of the vibrating member 21, and the sound is output into the air via the vibrating member 21. Since this vibrating member 21 is the same as the member used for the dome part of the high-frequency output dedicated speaker as described above, the sound output by the vibrating member 21 is higher in pitch than that of the first vibrating part 10.

[0029] Also, in the second vibrating part 20, neither the vibrating member 21 nor the second voice coil bobbin 23 is directly fixed to the frame 4, but they are fixed via the edge 7. Therefore, the vibration of the second vibrating part 20 is less likely to be affected by the vibration of the frame 4 caused by the first vibrating part 10, and a high-quality high-pitched sound with less distortion is reproduced.

[0030] Furthermore, the vibrating member 21 is connected not to the first voice coil bobbin 13 of the first vibrating part 10, but to the second voice coil bobbin 23 extending from the second vibrating body 22 disposed in the opening 6. The second voice coil bobbin 23 can make the distance from the vibrating member 21 on the side of one end 23A to the second voice coil 27 at the other end 23B shorter than that of the first voice coil bobbin 13. That is, compared with the configuration in which the vibrating member 21 is connected to the first voice coil bobbin 13, finer vibrations are more likely to be transmitted to the vibrating member 21, and a higher-pitched sound with finer texture can be output.

[0031] [Vibration transmission member] As shown in FIGS. 3 and 4, the vibration transmission member 60 includes a vehicle-side fixing part 62 fixed to the header panel 86, and an extending part 64 extending linearly from the vehicle-side fixing part 62 and having an end 64TA at its end as a free end, and an exciter 2 is attached to the end 64TA of the free end of the extending part 64.

[0032] The vibration transmission member 60 of the present embodiment is configured by fixing a metal plate constituting the vehicle-side fixing portion 62 and a metal plate constituting the extending portion 64 with welding, an adhesive, or the like. Specifically, the vehicle-side fixing portion 62 is formed by bending a metal plate into an L-shaped cross section in accordance with the L-shaped cross section of the header panel 86. By such bending, a vehicle-side fixing portion 62 having a first fixing surface 62A and a second fixing surface 62B that are in surface contact with the main surface 86A and the inclined surface 86B of the header panel 86, respectively, is obtained. The vehicle-side fixing portion 62 is firmly fixed to the header panel 86 with the first fixing surface 62A and the second fixing surface 62B by double-sided tape, screws, or the like.

[0033] The extending portion 64 is a plate material having a substantially rectangular shape in plan view with a predetermined length, has high thermal conductivity for transmitting the heat generated by the exciter 2 in the length direction, and has flexibility that can bend in the vehicle height direction Da along with the vibration of the exciter 2. It is formed of a metal material (iron in the present embodiment). One end portion 64TB of the extending portion 64 is firmly fixed to the vehicle-side fixing portion 62 by welding, an adhesive, a pressure-sensitive adhesive, or the like. In the present embodiment, the upper surface 64A of the extending portion 64 and the bottom surface of the first fixing surface 62A of the vehicle-side fixing portion 62 are surface-bonded with a predetermined area or more, and the extending portion 64 and the vehicle-side fixing portion 62 are fixed together. The other end portion 64TA of the extending portion 64 extends a predetermined distance from the coupling point 65 with the vehicle-side fixing portion 62, and the exciter 2 is fixed to the upper surface 64A of the end portion 64TA by any fixing means such as an adhesive, double-sided tape, or a screw.

[0034] In such a vibration generating device 1, since the vehicle-side fixing portion 62 is fixed to the header panel 86 by the surfaces of the first fixing surface 62A and the second fixing surface 62B, the vibration of the exciter 2 is efficiently transmitted to the header panel 86. Further, since the vehicle-side fixing portion 62 is fixed to the surface of the header panel 86 at two locations, the first fixing surface 62A and the second fixing surface 62B, the vibration is transmitted more efficiently. In addition, the vehicle-side fixing portion 62 has two fixing points with the header panel 86 that sandwich the corner portion (the intersection of the main surface 86A and the inclined surface 86B) of the header panel 86 having an L-shaped cross section in the longitudinal direction Db of the entire vehicle 80. As a result, compared with a configuration in which the vehicle-side fixing portion 62 is fixed to only one of the main surface 86A and the inclined surface 86B of the header panel 86, the vibration of the exciter 2 can be efficiently transmitted to the header panel 86.

[0035] Further, even when large-acceleration vibrations are applied to the exciter 2 due to the swaying of the vehicle 80 and impact sounds may be generated by the vibrations, the flexible extension 64 bends appropriately to disperse the impact sounds. As a result, while the vibration generated by the exciter 2 itself is sufficiently transmitted to the header panel 86, the transmission of the impact sound can be suppressed. In addition, since the extension portion 64 is substantially rectangular in plan view, vibrations of sounds corresponding to the high-frequency range are emitted from the extension portion 64, improving the sound quality. In addition to this, the amount of heat generated by the exciter 2 transferred to the extension portion 64 can also be sufficiently radiated from the entire surface of the extension portion 64, improving the cooling performance of the exciter 2.

[0036] As shown in FIG. 3, a through hole 64K penetrating in the vertical direction is formed in the extension portion 64 of the vibration transmission member 60, and the exciter 2 is fixed to the upper surface 64A above the extension portion 64 so that the second vibration portion 20 is located in the through hole 64K. Such a vibration generating device 1 is installed so that the through hole 64K of the vibration transmission member 60 (that is, the second vibration portion 20 of the exciter 2) is positioned with a gap substantially directly above the hole portion 84K of the interior material 84. As a result, the high-pitched sound generated by the second vibration portion 20 of the exciter 2 is radiated into the passenger compartment space Sb through the through hole 64K of the vibration transmission member 60 and the hole portion 84K of the interior material 84. Since the exciter 2 is fixed to the upper surface 64A of the extension portion 64 and thus the exciter 2 is disposed at a height position approximately the same as that of the header panel 86, the vibration generating device 1 can be installed in a vehicle 80 of a vehicle type with a narrow width in the vehicle height direction Da of the ceiling space Sa.

[0037] [Elastic Deformation Member] As shown in FIG. 3, the elastic deformation member 70 is a hollow cylindrical (cylindrical in this embodiment) member, and a hollow portion 71 penetrating through one end portion 70TA and the other end portion 70TB is formed inside. Such an elastic deformation member 70 is an elastic member that elastically deforms due to the vibration of the vibration transmission member 60 by the first vibration portion 10 of the exciter 2, and is preferably made of resin (for example, chloroprene rubber). In this embodiment, a rubber sponge mainly made of resin is used.

[0038] One end portion 70TA of the elastic deformation member 70 is coupled to the exciter 2 with the vibration transmission member 60 interposed therebetween, and the other end portion 70TB is coupled to the interior material 84. In this case, the hollow portion 71 inside the elastic deformation member 70 extends across the second vibration portion 20 of the exciter 2 and the hole portion 84K of the interior material 84, communicates with the through hole 64K of the vibration transmission member 60 and the hole portion 84K of the interior material 84, and the high-pitched sound radiated by the second vibration portion 20 is radiated from the hole portion 84K to the vehicle compartment space Sb through the hollow portion 71. Thereby, the high-pitched sound radiated by the second vibration portion 20 can be efficiently radiated to the vehicle compartment space Sb without being dissipated in the ceiling back space Sa. The surface of the hollow portion 71 is a smooth surface without irregularities that cause sound absorption of the high-pitched sound, and the loss of the high-pitched sound propagating in the hollow portion 71 is suppressed.

[0039] In addition, in the vibration generating device 1, a vibration with a large acceleration is applied to the exciter 2 due to the shaking of the vehicle 80 during traveling, and the vibration transmission member 60 may resonate due to the vibration. On the other hand, by coupling the elastic deformation member 70 to the vibration transmission member 60, the resonance of the vibration transmission member 60 can be suppressed.

[0040] In addition, the elastic deformation member 70 of the present embodiment has a hardness that transmits the vibration of the vibration transmission member 60 by the first vibration part 10 of the exciter 2 to the interior material 84 and vibrates the interior material 84 as a diaphragm of the speaker device. As a result, bass is also radiated from the interior material 84 into the passenger compartment space Sb. Since the interior material 84 is closer to the head of the occupant than the roof panel 81R and the front glass 82F, the bass can be more efficiently heard by the occupant. Further, since the vibration transmission member 60, the roof panel 81R and the front glass 82F, and the interior material 84 have different natural resonance frequencies, the frequency band of the reproducible bass range is widened compared to the case where the interior material 84 is not used. Also, since the frequency of the vibration transmitted to the interior material 84 through the elastic deformation member 70 changes depending on the hardness of the interior material 84, the band of the bass radiated from the interior material 84 can be changed by using an elastic deformation member 70 with an appropriate hardness.

[0041] Note that the vibration transmission rate of the elastic deformation member 70 is preferably as large as possible within a range not exceeding "1". The vibration transmission rate is a value obtained by dividing the force transmitted to the interior material 84 through the elastic deformation member 70 by the excitation force of the vibration transmission member 60 by the first vibration part 10 of the exciter 2. When the vibration transmission rate of the elastic deformation member 70 is "1" or a value close to "1", the vibration by the first vibration part 10 of the exciter 2 is efficiently transmitted to the interior material 84.

[0042] Here, as the hardness is too high or the like, the smaller the elastic deformation amount of the vibration transmission member 60 with respect to the excitation force of the vibration transmission member 60, the smaller the amplitude of the vibration of the vibration transmission member 60, and the vibration with the amplitude necessary for outputting bass cannot be transmitted to the header panel 86. Therefore, the elastic deformation member 70 of the present embodiment has a hardness such that the amplitude of the vibration of the vibration transmission member 60 is substantially the same as the amplitude in a state where the elastic deformation member 70 is not coupled.

[0043] In addition, in the vibration generator 1 of the present embodiment, since the exciter 2 is fixed to the end portion 64TA which is the free end of the vibration transmission member 60, the convergence time from when the vibration of the first vibration portion 10 stops until the vibration of the vibration transmission member 60 converges is longer than the case where the exciter 2 is fixed to the fixed end. As a result, if no countermeasure is taken, it will cause reverberation sound not based on the acoustic signal to occur for a relatively long time. On the other hand, the vibration transmission member 60 of the present embodiment has a hardness that serves as a resistance to attenuate the vibration of the vibration transmission member 60 after the vibration of the first vibration portion 10 stops (that is, in a state where there is no exciting force by the first vibration portion 10). Thereby, after the vibration of the first vibration portion 10 stops, the elastic deformation member 70 functions as a resistance source for attenuating the vibration, so that the transient characteristics of the vibration generator 1 can be improved.

[0044] The elastic deformation member 70 is coupled to the exciter 2 with the vibration transmission member 60 interposed therebetween, and one end portion 70TA on the coupled side is fixed to the vibration transmission member 60 by an appropriate fixing means such as adhesion. Regarding the fixing of the other end portion 70TB to the interior material 84, it is optional, but by fixing the other end portion 70TB to the interior material 84 with an adhesive or the like, the elastic deformation member 70 does not separate from the interior material 84 along with the vibration of the vibration transmission member 60, and the vibration of the vibration transmission member 60 can be efficiently transmitted to the interior material 84.

[0045] According to the present embodiment, the following effects are obtained.

[0046] The vibration generator 1 of the present embodiment includes an exciter 2 having a first vibration portion 10 that outputs vibration corresponding to the low frequency range, a vibration transmission member 60 having one end fixed to the header panel 86 of the vehicle 80 and the exciter 2 attached to the other end, and that transmits the vibration of the exciter 2 to the header panel 86, and an elastic deformation member 70 that elastically deforms in response to the vibration of the vibration transmission member 60. This elastic deformation member 70 is coupled to the exciter 2 and the interior material 84 of the vehicle 80. Thus, even when large-acceleration vibrations are applied to the exciter 2 due to the shaking of the vehicle 80 during driving, by providing the elastic deformation member 70, resonance of the vibration transmission member 60 due to the vibrations can be suppressed.

[0047] In the vibration generator 1 of the present embodiment, the exciter 2 has a second vibration unit 20 that outputs vibrations corresponding to the high-frequency range, and a hole 84K is formed in the interior material 84. Further, the elastic deformation member 70 has a hollow portion 71 extending between the second vibration unit 20 of the exciter 2 and the hole 84K of the interior material 84. Thus, the high-frequency sound radiated by the second vibration unit 20 can be efficiently radiated into the passenger compartment space Sb without being dissipated in the ceiling-back space Sa.

[0048] In the vibration generator 1 of the present embodiment, when the vehicle height direction Da of the vehicle 80 is the vertical direction, the exciter 2 is attached above the vibration transmission member 60, and a through hole 64K penetrating in the vertical direction is provided in the vibration transmission member 60 at the position of the second vibration unit 20 of the exciter 2. Further, the hollow portion 71 of the elastic deformation member 70 communicates with the through hole 64K of the vibration transmission member 60. Thus, since the exciter 2 is disposed at a height position approximately the same as that of the header panel 86, the vibration generator 1 can be installed in a vehicle 80 of a vehicle type having a narrow width in the vehicle height direction Da of the ceiling-back space Sa.

[0049] In the vibration generator 1 of the present embodiment, the elastic deformation member 70 has a hardness that transmits the vibration of the first vibration unit 10 to the interior material 84. Thus, low-frequency sound can also be radiated from the interior material 84 into the passenger compartment space Sb. Further, since the roof panel 81R and the front glass 82F and the interior material 84 have different natural resonance frequencies from the vibration transmission member 60, the frequency band of the reproducible low-frequency range is widened as compared with the case where the interior material 84 is not used.

[0050] In the vibration generator 1 of the present embodiment, the elastic deformation member 70 is fixed to both the exciter 2 or the vibration transmission member 60 and the interior material 84. As a result, the elastic deformation member 70 does not separate from the interior member 84 along with the vibration of the vibration transmission member 60, and the vibration of the vibration transmission member 60 is efficiently transmitted to the interior member 84.

[0051] In the vibration generator 1 of the present embodiment, the elastic deformation member 70 is fixed to both the vibration transmission member 60 to which the exciter 2 is attached and the interior member 84. As a result, the elastic deformation member 70 does not separate from the interior member 84 along with the vibration of the vibration transmission member 60, and the vibration of the vibration transmission member 60 is efficiently transmitted to the interior member 84.

[0052] The above-described embodiments merely illustrate one aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.

[0053] For example, as shown in FIG. 7, the exciter 2 may be attached to the lower surface of the vibration transmission member 60. In this case, one end portion 70TA of the elastic deformation member 70 is directly coupled to the vibration transmission member 60 and fixed with an adhesive or the like.

[0054] Also, for example, the exciter 2 may not include the second vibration unit 20 that outputs vibrations corresponding to the high frequency range.

[0055] Also, for example, the vibration transmission member 60 does not necessarily have to include the vehicle-side fixing portion 62. That is, the upper surface 64A of the extending portion 64 of the vibration transmission member 60 may be fixed to the main surface 86A of the header panel 86, or the end portion of the extending portion 64 on the side of the windshield 82F may be fixed to the tip portion 86A1 of the main surface 86A of the header panel 86.

[0056] The horizontal and vertical directions and various numerical values, shapes, and materials in the above-described embodiments include ranges (so-called equivalent ranges) that exhibit the same effects as those directions, numerical values, shapes, and materials, unless otherwise specified.

Explanation of Reference Numerals

[0057] 1 Vibration generator 2 Exciter (vibration generating unit) 10 First vibration unit (first output unit) 20 Second vibration unit (second output unit) 60 Vibration transmission member 64 Extension part 64K Through-hole 70 Elastic deformation member 70TA One end 70TB The other end 71 Hollow part 80 Vehicle 81R Roof panel 82F Front glass 84 Interior material (ceiling member) 84K Hole part 90 Sound source device Da Vehicle height direction Db Overall length direction Dc Vehicle width direction Sa Ceiling cavity Sb Passenger compartment space

Claims

1. A vibration generating unit having a first output unit that outputs vibrations corresponding to a low frequency range; A vibration transmission member having one end fixed to a header panel of a vehicle and the vibration generating unit attached to the other end, for transmitting vibrations from the first output unit of the vibration generating unit to the header panel; An elastically deformable member that elastically deforms in response to vibrations of the vibration transmission member; Comprising; The elastically deformable member is Coupled to the vibration generating unit and a ceiling member in the vehicle interior of the vehicle; The vibration transmission member is in surface contact with the header panel of the vehicle on a plurality of surfaces A vibration generating device characterized by the above.

2. The vibration generating unit is Has a second output unit that outputs vibrations corresponding to a high frequency range, The ceiling member is A hole is formed therein, The elastically deformable member is Has a hollow portion extending between the second output unit of the vibration generating unit and the hole of the ceiling member The vibration generating device according to claim 1, characterized by the above.

3. When the vehicle height direction of the vehicle is the vertical direction, the vibration generating unit is attached above the vibration transmission member, A through hole penetrating in the vertical direction is provided in the vibration transmission member at the position of the second output unit of the vibration generating unit, The hollow portion of the elastically deformable member is Communicates with the through hole of the vibration transmission member The vibration generating device according to claim 2, characterized by the above.

4. The elastically deformable member is Has a hardness for transmitting vibrations of the first output unit to the ceiling member The vibration generating device according to any one of claims 1 to 3, characterized by the above.

5. The elastically deformable member is Has a hardness that serves as a resistance for damping vibrations of the vibration transmission member in a state where there is no excitation force by the first output unit The vibration generating device according to any one of claims 1 to 4, characterized by the above.

6. The elastically deformable member is Fixed to both the vibration generating unit, or the vibration transmission member, and the ceiling member The vibration generating device according to claim 4 or 5, characterized by the above.

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