WO2010150385A1

WO2010150385A1 - Vibration damper and damping mechanism

Info

Publication number: WO2010150385A1
Application number: PCT/JP2009/061623
Authority: WO
Inventors: 大介高橋; 泰久阿部
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2009-06-25
Filing date: 2009-06-25
Publication date: 2010-12-29

Abstract

Provided are a vibration damper capable of damping vibrations at various frequencies of a mount member, and a damping mechanism provided with the vibration damper. A damping mechanism (1) is provided with an inner panel (7), a speaker (4), and a vibration damper (5). The inner panel (7) is vibrated by the speaker (4). A vibration damper mounting portion (9) for mounting the vibration damper (5) thereto is provided in the surface of the inner panel (7). The vibration damper (5) is provided with a magnetic circuit portion (12) and a vibration portion (13) provided with a conductive member (27) disposed in a magnetic gap (G) of the magnetic circuit portion (12). The vibration portion (13) is provided to be able to be vibrated with respect to the magnetic circuit portion (12) by an elastic member (30), and a mass body (31) is mounted to the vibration portion. Either one of the magnetic circuit portion (12) or the mass body (31) of the vibration portion (13) is mounted to the inner panel (7).

Description

Vibration attenuator and damping mechanism

The present invention relates to a vibration attenuator for attenuating vibration generated by a speaker of a member to be attached such as a frame to which the speaker is attached, and a damping mechanism including the vibration attenuator.

A speaker attached to a door panel or the like as a member to be attached to an automobile that has been conventionally used includes a speaker unit including a vibration part and a magnetic circuit part that vibrates the vibration part to generate sound, and the speaker. And a case for housing the unit. The vibration part includes a voice coil provided in a magnetic gap (to be described later) of the magnetic circuit part, a diaphragm that can vibrate together with the voice coil, and the like.

The magnetic circuit is made of a magnetic material and is formed in an annular shape, and is connected to the diaphragm and the like via a damper, a magnet attached to the yoke plate, a magnetic material, and the magnetic material. A yoke that is attached to the magnet and that forms a magnetic gap for generating a magnetic force for driving (vibrating) the diaphragm with respect to the yoke plate.

The case is formed in a bottomed cylindrical shape including a bottom plate portion and a cylindrical portion erected from the outer edge of the bottom plate portion. The case accommodates the speaker unit in such a manner that the diaphragm is exposed outside the case. The case is fixed to the yoke of the magnetic circuit unit described above. Further, the case is attached to the door panel described above.

In the speaker configured as described above, a voice current is supplied to the voice coil, the voice coil vibrates according to the voice current, and the diaphragm vibrates to generate a sound according to the voice current. In the conventional speaker described above, when a sound is generated, a voice current is supplied to the voice coil to vibrate the voice coil. At this time, the yoke and the case vibrate due to a reaction when vibrating the voice coil. When the case vibrates, the door panel described above vibrates. There is a possibility that unnecessary sound based on the vibration of the door panel is added to the sound generated by the speaker unit described above, and the sound quality of the speaker unit described above is deteriorated. In order to suppress this kind of deterioration in sound quality, it has been proposed to attach a vibration attenuator for attenuating the vibration of the door panel to the door panel described above (see, for example, Patent Document 1).

The vibration attenuator shown in Patent Document 1 includes an elastic body that is elastically deformable and a mass body (weight) attached to the elastic body. When the door panel vibrates, the vibration attenuator shown in Patent Document 1 is elastically deformed by the mass body that tries to stay in place according to the law of inertia, so that the attached member such as the door panel described above is elastically deformed. Vibration is damped.

JP 2005-343362 A

In the conventional vibration attenuator described above, since the spring constant of the elastic body provided between the mass body and the mounted member is constant, the resonance frequency of vibration when the elastic body is deformed is constant. End up. For this reason, the above-described conventional vibration attenuator has a limited frequency of vibration of the attached member that can attenuate the vibration of the attached member, and sufficiently attenuates vibrations of various frequencies. It was difficult.

Further, since the above-described elastic body is made of synthetic resin or the like, it is easily affected by a change in temperature or easily deteriorated over time, and it is difficult to stably attenuate the vibration of the mounted member for many years. Met.

Therefore, an object of the present invention is to provide, for example, a vibration attenuator capable of attenuating vibrations of various frequencies of a mounted member and a damping mechanism including the vibration attenuator.

In order to solve the problems and achieve the object, the vibration attenuator of the present invention according to claim 1 is attached to a member to be attached to which a speaker is attached and a vibration attenuator that attenuates the vibration of the member to be attached. In addition, the magnetic circuit unit, the conductive member disposed in the magnetic gap of the magnetic circuit unit, the conductive member is provided, and the elastic member is provided so as to freely vibrate with respect to the magnetic circuit unit, and the mass. A vibration part to which a body is attached, and one of the magnetic circuit part and the mass body of the vibration part is attached to the attached member.

It is a perspective view of the damping mechanism concerning the 1st example of the present invention. It is a front view of the vibration attenuator of the damping mechanism shown in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. FIG. 4 is a cross-sectional view of a mass body accommodating portion and the like of the vibration attenuator shown in FIG. FIG. 5 is a cross-sectional view of the mass body taken along line VV in FIG. 3. FIG. 4 is a cross-sectional view of the mass body taken along line VI-VI in FIG. 3. FIG. 3 is a front view of an elastic member of the vibration attenuator shown in FIG. 2. It is sectional drawing of modifications, such as a mass body accommodating part shown by FIG. It is sectional drawing of the modification of the mass body shown by FIG. It is sectional drawing of the modification of the mass body shown by FIG. FIG. 4 is a cross-sectional view of a modified example of the conductive member of the vibration attenuator shown in FIG. 3. It is sectional drawing of other modifications, such as a conductive member of the vibration attenuator shown in FIG. It is sectional drawing of the modification of the damping mechanism shown by FIG. It is sectional drawing of the vibration attenuator of the damping mechanism concerning the 2nd Example of this invention. It is sectional drawing of the vibration attenuator of the damping mechanism concerning the 3rd Example of this invention.

Hereinafter, a vibration attenuator according to an embodiment of the present invention will be described. A vibration attenuator according to an embodiment of the present invention includes a mass body in a vibration part provided with a conductive member disposed in a magnetic gap of a magnetic circuit part and provided in an elastic member so as to vibrate with respect to the magnetic circuit part. Is attached. With this configuration, when the attached member vibrates, the mass is opposite to the direction in which the attached member vibrates at the resonance frequency defined by the mass of the mass body and the spring constant of the elastic member. The body vibrates. At this time, the conductive member arranged in the magnetic gap vibrates, and an induced electromotive force is generated in the conductive member. An electromagnetic force acts on the conductive member by the induced current generated in the conductive member due to the generation of the induced electromotive force and the magnetic flux passing through the magnetic gap. The vibration of the conductive member due to the electromagnetic force is transmitted to the mass body, and the vibration of the attached member is attenuated. In addition, the electromagnetic force acting on the conductive member is naturally generated when the mass body vibrates at various frequencies. Therefore, it is a predetermined frequency different from the above-described resonance frequency, and even if the phase of vibration of the mass body and the attached member is different from each other and is not equal to 180 degrees, in other words, the vibration directions are not completely opposite to each other. In both cases, the vibration of the attached member can be attenuated.

As described above, the vibration attenuator according to the embodiment of the present invention attenuates the vibration of the mass body, that is, the mounted member by the electromagnetic force generated by the elastic deformation of the elastic member and the vibrations of various frequencies described above. In the vibration attenuator, because the electromagnetic force described above is generated by vibrations of various frequencies, the mass body vibrates with respect to the magnetic circuit section even at a frequency other than the resonance frequency determined by the mass of the mass body and the spring constant of the elastic member. Therefore, it is possible to attenuate vibrations of various frequencies of the mounted member.

Furthermore, since the damping mechanism described above attenuates the vibration of the mounted member not only by the elastic member but also by the electromagnetic force of the conductive member, the conductive member is naturally less likely to deteriorate over time than the elastic member. The vibration of the mounted member can be attenuated stably. Further, since the temperature dependence of the damping characteristic with respect to the temperature around the vibration attenuator is relatively small, the vibration of the attached member can be stably damped.

Further, in the damping mechanism of the present invention, the vibration part may be constituted by a mass body support part and a conductive member support part. In this case, since the vibration part is divided into a member that supports the mass body and a member that supports the conductive member, the mass body and the conductive member can be easily assembled and assembled.

Furthermore, the conductive member support part may attach the conductive member to one end part and attach the mass body support part to the other end part. In this case, the conductive member can be disposed in the magnetic gap, and the mass body support portion can be reliably assembled to the conductive member support portion.

Further, the mass body support section may include a mass body housing section that houses the mass body. In this case, the mass body can be attached to the mass body support portion.

A through-hole communicating with the outside may be provided in the mass body support portion. In this case, when the mass body, that is, the mass body support portion vibrates, even if the pressure in the space surrounded by the magnetic circuit portion, the conductive member support portion, and the mass body support portion changes, the gas is externally supplied through the above-described through hole. Thus, it is possible to prevent the mass body support portion, that is, the vibration of the mass body from being hindered by the change in the pressure of the space described above. Therefore, the mass body can be vibrated, and the vibration of the attached member can be attenuated.

A through hole may be provided on the inner peripheral side (inside) of the conductive member support. In this case, the mass body can be vibrated by communicating the inside and outside of the space surrounded by the magnetic circuit portion, the conductive member support portion, and the mass body support portion, and the vibration of the attached member can be attenuated. it can.

A first yoke through-hole opened in a space surrounded by the yoke and the mass body support portion may be provided in the yoke of the magnetic circuit portion. In this case, in addition to the through hole, the first yoke through hole communicates the inside and outside of the space surrounded by the magnetic circuit portion, the conductive member support portion, and the mass body support portion. Even if the pressure in the space surrounded by the part, the conductive member support part, and the mass body support part changes, gas enters and exits through the first yoke through hole in addition to the through hole described above. It is possible to suppress the vibration of the mass body supporting portion, that is, the mass body from being hindered by the change.

A second yoke through hole extending along the vibration direction may be provided in the columnar portion of the yoke. In this case, the first yoke through-hole opens toward the second yoke through-hole, and the first yoke through-hole can communicate the inside and outside of the space described above.

The first yoke through hole may extend in the direction intersecting the second yoke through hole and open to the outer peripheral surface of the columnar portion. In this case, the first yoke through hole can reliably communicate the inside and outside of the space described above.

The elastic member may be formed in an annular shape having an inner edge attached to the conductive member support and an outer edge attached to the magnetic circuit, and a slit may be provided between the inner edge and the outer edge. In this case, the elastic member is easily elastically deformed, and the mass body can be vibrated at various frequencies.

The slit provided in the elastic member may be composed of a circumferentially extending portion extending in the circumferential direction of the elastic member and a radially extending portion extending in the radial direction. In this case, the slit can easily elastically deform the elastic member.

A curved portion may be provided on the elastic member. In this case, since the elastic member has a desired rigidity and the elastic member is easily elastically deformed, the elastic member can be prevented from aging, and the vibration of the mounted member can be stably attenuated for many years. be able to.

Multiple mass bodies may be attached. In this case, by changing the number of mass bodies, it is possible to appropriately change the resonance frequency of vibration of the mass body, that is, the member to be damped. Therefore, it is possible to attenuate vibrations of various frequencies of the mounted members.

The mass body accommodating portion may have a shape that allows the number of mass bodies to be accommodated to be changed. In this case, the number of mass bodies can be easily changed, and the mass body is housed in the mass body housing portion in a state where the mass body can be detached from the mass body housing portion. The prescribed resonance frequency can be changed, and vibrations at various frequencies of the mounted member can be reliably damped.

The mass body housing portion may be provided with a support rod that stands from the bottom surface portion thereof and enters the center hole (hole portion) of the mass body. In this case, the number of mass bodies can be easily changed, and vibrations at various frequencies of attached members can be reliably damped.

The yoke may be provided with an outer peripheral cylinder portion standing from the outer edge of the bottom surface portion and accommodating at least a part of the mass body support portion. In this case, the thickness of the entire vibration attenuator can be made relatively small.

An inner diameter enlarged portion may be provided in the second yoke through hole, and an outer diameter reduced portion that enters the inner diameter enlarged portion may be provided in the mass body accommodating portion. In this case, the thickness of the entire vibration attenuator can be made relatively small.

The conductive member may be formed in an annular shape and disposed in the magnetic gap. In this case, the electromagnetic force generated in the conductive member is substantially uniform in the circumferential direction, so that the vibration of the mass body can be prevented from being uneven in the circumferential direction, and the vibration of the attached member can be attenuated. . Further, by forming the conductive member in an annular shape or by winding it along the magnetic gap to form an annular shape, the entire length of the conductive member becomes relatively long and the electrical resistance value becomes relatively small. Therefore, the induced electromotive force generated in the conductive member can be made relatively large, the amplitude of the conductive member and the mass body to which the vibration of the conductive member is transmitted become relatively large, and the vibration of the attached member can be attenuated satisfactorily. The vibration of the mounted member can be damped in a relatively large frequency band. Note that the conductive member formed in an annular shape or wound may be short-circuited by connecting both ends thereof, and the short-circuit method is not particularly limited.

The conductive member may be composed of a coil having both ends connected by an electric resistor. In this case, the strength of the electromagnetic force generated in the conductive member is adjusted by the electric resistance value of the electric resistor, and the desired electromagnetic force can be generated in the conductive member. Can be adjusted.

A plurality of electrical resistors may be provided, and both ends of the coil may be connected by any one of the plurality of electrical resistors. In this case, by appropriately changing the electric resistor, the strength of the electromagnetic force generated in the conductive member can be changed as appropriate, a desired electromagnetic force can be generated in the conductive member, and the damping characteristic provided in the vibration attenuator Can be adjusted.

A variable resistor may be provided as an electrical resistor. In this case, by appropriately changing the electric resistance value of the electric resistor, the strength of the electromagnetic force generated in the conductive member can be changed as appropriate, and a desired electromagnetic force can be generated in the conductive member, and vibration can be generated. The attenuation characteristic of the attenuator can be adjusted.

The mass body may be arranged on the plate, and the outer diameter of the mass body may be formed larger than the inner diameter of the plate. In this case, since the outer diameter of the mass body is larger than the magnetic circuit portion, the magnetic circuit portion can be prevented from obstructing the vibration of the mass body, and the vibration of the attached member can be attenuated. Further, the outer diameter of the mass body can be set to a desired outer diameter without considering the outer diameter of the magnetic circuit portion.

A mass body may be arranged inside the magnet and plate of the magnetic circuit section. In this case, the thickness of the entire vibration attenuator can be made relatively small.

The mass body supporting portion may be provided inside the magnet and the plate and may include a mass body accommodating portion that accommodates the mass body. In this case, since the mass body can be arranged inside the magnet and the plate of the magnetic circuit unit, the thickness of the entire vibration attenuator can be made relatively small.

The present invention may be a damping mechanism including a mounted member and the above-described vibration attenuator mounted on the mounted member. In this case, since the damping mechanism includes the vibration attenuator having the above-described configuration, it can attenuate vibrations of various frequencies of the mounted member, and can stably vibrate the mounted member for many years. Can be attenuated. Further, since the temperature dependence of the damping characteristic with respect to the temperature around the vibration attenuator is relatively small, the vibration of the attached member can be stably damped.

The resonance frequency of the attached member and the resonance frequency of the vibration attenuator may be substantially equal to each other. In this case, the vibration attenuator can attenuate the vibration of the attached member. In the present invention, the resonance frequency is substantially equal means that the vibration of the mounted member is attenuated by the vibration of the vibration attenuator even if the resonance frequency of the mounted member and the resonance frequency of the vibration attenuator do not completely match. It shows that these resonance frequencies are close to the extent that they can be generated.

A through-hole into which a fixture for fixing the frame and the attached member is inserted may be formed on the outer edge portion of the frame attached to the magnetic circuit portion. In this case, the frame, that is, the vibration attenuator can be attached to the attached member.

Further, the present invention may be an automobile provided with the vibration attenuator described above. In this case, it is possible to attenuate the vibration of the body of the automobile.

Further, the present invention may be an electronic device including the vibration attenuator described above. In this case, vibration of the casing of the electronic device can be attenuated.

Further, the present invention may be a building including the vibration attenuator described above. In this case, it is possible to attenuate the vibration of the wall of the building.

An embodiment of the present invention will be described with reference to FIGS. An automobile 1 according to an embodiment of the present invention includes a damping mechanism 1 shown in FIG. As shown in FIG. 1, the damping mechanism 1 includes a door panel 3 as a panel constituting a vehicle body of an automobile 2 as a moving body, a speaker 4 attached to the door panel 3, and a plurality of attached to the door panel 3. The vibration attenuator 5 is provided.

As shown in FIG. 1, the door panel 3 includes an outer panel 6 and an inner panel 7 attached to the outer panel 6.

Panels

6 and 7 are obtained by roll forming a steel plate. A door glass (not shown) is stored between the

panels

6 and 7. The door panel 3 is attached to the body of the automobile 2 via a hinge and is rotatably supported by the hinge described above. The door panel 3 opens and closes the passenger compartment by being rotated by a hinge.

Further, the speaker 4 described above, a power window motor as an electronic device (not shown), a door lock actuator, and the like are attached to the inner panel 7. The inner panel 7 is provided with a plurality of holes 8 for accommodating the speaker 4 described above, a power window motor as an electronic device (not shown), a door lock actuator, and the like. In addition, this inner panel 7 has comprised the to-be-attached member described in the claim.

Further, the inner panel 7 vibrates along arrows P1 and P2 parallel to the axis of the speaker 4 when the speaker 4 generates sound as will be described later. Further, the resonance frequency when the inner panel 7 vibrates along the arrows P1 and P2 differs depending on the location. In general, the resonance frequency decreases (shifts to the reduction side) toward the speaker 4 or toward the center of the inner panel 7, and the resonance frequency increases toward the outer edge of the inner panel 7 (to the high reduction side). shift).

Note that the resonance frequency described in this specification refers to a so-called resonance frequency of a structure such as the vibration attenuator 5 and the inner panel 7 and n of a structure such as the vibration attenuator 5 and the inner panel 7 (n is a natural number). This is a general term for the nth order resonance frequency in the next natural vibration mode.

Furthermore, a plurality of vibration attenuator attachment points 9 are provided on the surface of the inner panel 7. The vibration attenuator mounting portion 9 vibrates when the speaker 4 generates sound. For this reason, at least two resonance frequencies among the plurality of vibration attenuator mounting portions 9 are different from each other. A vibration attenuator 5 is attached to each of the vibration attenuator attachment points 9.

The speaker 4 generates a sound corresponding to the sound current when the sound current is supplied to a voice coil (not shown) and the voice coil or the like vibrates the diaphragm 10 along the arrows P1 and P2. The speaker 4 vibrates the inner panel 7 along the arrows P1 and P2 simultaneously when vibrating the diaphragm 10 and the like.

Each of the plurality of vibration attenuators 5 is attached to the vibration attenuator attachment portion 9 on the surface of the inner panel 7 described above. The resonance frequency when the mass body 31 described later of each vibration attenuator 5 vibrates relative to the magnetic circuit unit 12 described later along the axis P is, for example, a vibration attenuator to which each vibration attenuator 5 is attached. This is substantially equal to the primary resonance frequency when the attachment portion 9 vibrates along the axis P. For this reason, the resonance frequency of each vibration attenuator 5 is substantially equal to the resonance frequency of the vibration attenuator attachment location 9 to which each vibration attenuator 5 is attached. Further, the resonance frequency of each vibration attenuator 5 may be set to be approximately equal to the primary resonance frequency or the higher-order resonance frequency of the vibration attenuator mounting portion 9 to which each vibration attenuator 5 is attached, or audibility. However, it may be set to a specific frequency that causes a problem, or may be changed as necessary. It should be noted that the resonance frequencies referred to in the present invention are substantially equal even if the vibration attenuator mounting portion 9 of the inner panel 7, that is, the resonance frequency of the inner panel 7 and the resonance frequency of the vibration attenuator 5 do not completely match. It shows that these resonance frequencies are close to the extent that the vibration attenuator mounting portion 9 of the panel 7, that is, the vibration of the inner panel 7 can be attenuated by the vibration of the mass body 31 of the vibration attenuator 5.

As shown in FIGS. 2 and 3, the vibration attenuator 5 includes a frame 11, a magnetic circuit unit 12, and a vibration unit 13.

As shown in FIG. 2, the frame 11 is made of, for example, a nonmagnetic material and has a planar shape formed in a convex shape from the outer peripheral surface of the frame main body 14 to the outer peripheral surface. It is provided with the attachment part 15 which has. The attachment portions 15 are provided at positions corresponding to the attachment positions with the inner panel 7. For example, a pair of attachment portions 15 are provided at positions that are substantially symmetrical with respect to one point on the axis P of the frame main body 14, that is, the vibration attenuator 5. ing. The attachment portion 15 is provided on the outer edge portion of the frame 11 by being provided so as to protrude from the outer peripheral surface of the frame body 14. The attachment portion 15 is provided with a through hole 16 that penetrates along the axis P. The through-hole 16 passes a bolt 18 as a fixing tool screwed into a weld nut 17 attached to the inner panel 7 to the inside. The bolt 18 is screwed into the weld nut 17 through the through hole 16 to fix the frame 11 to the inner panel 7.

The magnetic circuit unit 12 is fixed to the inner peripheral surface of the frame main body 14 and attached to the frame 11. As shown in FIG. 3, the magnetic circuit unit 12 includes a yoke 19 made of a magnetic material (so-called ferromagnetic material), a magnet 20 supported by the yoke 19, and a magnetic material (so-called ferromagnetic material). ) Or the like, and an annular (annular in the illustrated example) plate 21 is provided. The yoke 19 is an outer magnet integrally provided with an annular bottom plate 22 as a bottom surface portion and a cylindrical center pole 23 as a columnar portion formed so as to rise from the central inner edge portion of the bottom plate 22. Type magnetic circuit. In this embodiment, an external magnetic type magnetic circuit is disclosed. However, the present invention may be applied to an internal magnetic type magnetic circuit or a magnetic circuit in which a magnetic circuit using both an internal magnetic type and an external magnetic type is arranged. . In the present embodiment, the center pole 23 is provided with a second yoke through hole 24 extending along the shaft core P, that is, the shaft core P as the vibration direction of the vibration portion 13 at the center. It is provided over the full length of. That is, the second yoke through hole 24 opens on the surface side of the bottom plate 22 facing the outside.

The second yoke through hole 24 is provided with an inner diameter enlarged portion 25 whose inner diameter increases toward a mass body supporting portion 29 described later of the vibrating portion 13. Specifically, the inner diameter enlarged portion 25 is formed in a shape in which the inner diameter gradually increases as the mass body supporting portion 29 is approached.

Furthermore, the yoke 19 is provided with a first yoke through hole 26 that opens on both the inner and outer peripheral surfaces of the center pole 23 and extends in the radial direction of the center pole 23. The longitudinal direction of the first yoke through hole 26 and the longitudinal direction of the second yoke through hole 24 intersect each other (in the illustrated example, orthogonal). The first yoke through-hole 26 opens to both the inner and outer peripheral surfaces of the center pole 23, so that the first space K (see FIG. 5) surrounded by the center pole 23 of the yoke 19 and the mass body support portion 29 of the magnetic circuit portion 12. 3), the first space K and the outer periphery of the center pole 23, that is, the outside of the first space K, communicate with each other, and external gas enters and exits the first space K. It is free.

The magnet 20 is formed in an annular shape. The inner diameter of the magnet 20 is larger than the outer diameter of the center pole 23. The magnet 20 is superimposed on the bottom plate 22 through the center pole 23 on the inside. The magnet 20 described above may be excited by a permanent magnet or a DC power source.

The plate 21 is formed in an annular shape. The inner diameter of the plate 21 is larger than the outer diameter of the center pole 23. The plate 21 is superposed on the magnet 20 in a state where a center pole 23 of the yoke 19 and a conductive member support portion 28 described later are passed inside. The yoke 19, the magnet 20, and the plate 21 described above are arranged coaxially so that their centers are substantially the same. For this reason, a magnetic gap G is provided by forming a gap between the inner peripheral surface of the magnet 20 and the plate 21 and the outer peripheral surface of the center pole 23 of the yoke 19.

Further, the plate 21 described above is fixed to the inner peripheral surface of the frame main body 20 by a bolt (not shown) or a known adhesive. Thus, the magnetic circuit unit 12 is fixed to the frame 11. Of course, the yoke 19, the magnet 20 and the plate 21 are arranged coaxially with the frame 11.

With the above-described configuration, the magnetic circuit unit 12 forms a magnetic gap G having a relatively large magnetic flux density between the outer peripheral surface of the center pole 23 of the yoke 19 and the inner peripheral surface of the plate 21. That is, the magnetic circuit unit 12 causes the electromagnetic force (Lorentz force) to act on the conductive member 27 that is vibrated by the inner panel 7 in the magnetic gap G, and attenuates the vibration of the mass body 15 and the like.

The vibration unit 13 is accommodated in the frame body 20 of the frame 11. The vibration unit 13 includes a conductive member 27, a conductive member support portion 28, a mass body support portion 29, an elastic member 30, a plurality of mass bodies (weights) 31, and the like.

The conductive member 27 is made of a conductive metal and has an annular shape (annular shape in the illustrated example). The conductive member 27 is disposed coaxially with the conductive member support 28 and is attached to the outer periphery of one end of the conductive member support 28. The conductive member 27 is disposed in the above-described magnetic gap G of the magnetic circuit unit 12 in a stationary manner before the inner panel 7 vibrates.

The conductive member support portion 28 is formed in a cylindrical shape. The inner diameter of the conductive member support portion 28 is formed larger than the outer diameter of the center pole 23 that the yoke 19 has. The outer diameter of the conductive member support portion 28 is formed smaller than the inner diameters of the plate 21 and the magnet 20. The conductive member support portion 28 is disposed coaxially with the yoke 19, the plate 21, the conductive member 27, and the like. One end of the conductive member support portion 28 is inserted into the magnetic gap G, and a conductive member 27 is attached to the outer periphery of the one end portion. The conductive member support 28 is supported by the elastic member 30 so as to vibrate (move) along the axis P of the yoke 19. Note that the axis P of the conductive member support 28 and the yoke 19 is substantially the same as the axis P of the vibration attenuator 5.

As shown in FIG. 4, the mass body support portion 29 is formed in a cylindrical shape and attached to the inner periphery of the other end portion of the conductive member support portion 28, a through hole 33, and a surrounding wall 34 is provided. The mass body accommodating portion 32 includes a prefix conical portion 35 as an outer diameter reducing portion, an annular portion 36, an outer cylinder portion 37, and a support rod 38 that are arranged coaxially with each other. The prefix cone portion 35 is erected from a flat disk-shaped bottom surface portion 39 along a direction orthogonal to the axis P, and an outer edge of the bottom surface portion 39 in a direction away from the magnetic circuit portion 12. A cylindrical portion 40 whose inner and outer diameters gradually increase as the distance from the magnetic circuit portion 12 increases, and the appearance is formed in a so-called prefix cone shape. The prefix cone portion 35 includes the above-described bottom surface portion 39 and the cylindrical portion 40, and the outer diameter gradually decreases toward the yoke 19 and enters the inner diameter enlarged portion 25.

The annular portion 36 is formed in an annular shape, and the inner edge is continuous with the edge on the side away from the bottom surface portion 39 of the cylindrical portion 40 of the prefix cone portion 35. The outer cylinder part 37 is formed in a cylindrical shape, and stands up from the outer edge of the annular part 36. The support bar 38 is formed in a columnar shape and is erected from the center of the bottom surface 39.

The mass body accommodating portion 32 accommodates a mass body 31 which will be described later on the inside thereof, and the support rod 38 is inserted into the hole 41 of the mass body 31, so that these mass bodies 31 are replaced with the mass body supporting portion 29. Attach to. Further, the mass body accommodating portion 32 is configured to attach the mass body 31 by inserting the support rod 38 into the hole portion 41 of the mass body 31, thereby inserting the support rod 38 into the hole portion 41. It has a shape that can change the number of mass bodies 31 to be changed. With this configuration, the mass body accommodating portion 32 is configured to change the number of mass bodies 31 to be accommodated, and accommodates the mass body 31 in a state in which the mass body accommodating portion 32 can be detached from the mass body accommodating portion 32.

Of course, the mass body accommodating portion 32 is arranged coaxially with the magnetic circuit portion 12 and the like. The mass body accommodating portion 32 is provided so as to freely vibrate along the axis P by an elastic member 30 described later. Further, the mass body accommodating portion 32 is provided in the inner diameter enlarged portion 25 of the yoke 19 in a neutral state where the elastic member 30 is not elastically deformed by the elastic member 30 or the like and spaced from the yoke 19. It arrange | positions in the state in which some accommodating parts 32 were penetrate | invaded.

A plurality of through-holes 33 are provided at the outer edge of the annular portion 36 at intervals in the circumferential direction of the annular portion 36. For this reason, the through hole 33 is arranged on the inner peripheral side of the conductive member support portion 28 with respect to the conductive member 27. Of course, the through-hole 33 penetrates the annular portion 36. In the illustrated example, four through holes 33 are provided at equal intervals in the circumferential direction of the annular portion 36. The surrounding wall 34 stands up from the edge of the through hole 33 and surrounds the through hole 33 together with the outer cylinder portion 37. The through-hole 33 passes through the annular portion 36 to communicate the first space K surrounded by the mass body support portion 29, the magnetic circuit portion 12, and the conductive member support portion 28 with the outside. . Note that the first space K is formed inside the conductive member 27. Further, the through-hole 33 penetrates the annular portion 36, so that the conductive member 27 and the conductive member support portion 28 are disposed on the inner side with respect to a position where the conductive member support portion 28 is attached to the mass body support portion 29. Furthermore, a second space K2 surrounded by the mass body support portion 29, the plate 21 of the magnetic circuit portion 12, and the conductive member 27 is formed outside the conductive member 27.

The elastic member 30 is made of an elastic material and is formed in an annular shape (annular in the illustrated example) as shown in FIG. The elastic member 30 has its inner edge attached to the outer peripheral surface of the other end of the conductive member support portion 28 and its outer edge attached to the magnetic circuit portion 12 via the frame body 14 of the frame 11 to be elastically deformed. Thus, the conductive member support portion 28, the mass body support portion 29, and the mass body 31 are supported along the axis P so as to be able to vibrate relative to the magnetic circuit portion 12 and the like. The elastic member 30 is attached to the magnetic circuit unit 12 via the frame body 14 because the outer edge of the elastic member 30 is attached to the frame body 14 of the frame 11.

Further, the elastic member 30 is provided with a plurality of slits 42. The slits 42 penetrate the elastic member 30, and four slits 42 are arranged in the circumferential direction of the elastic member 30 in the illustrated example. The slit 42 is, of course, provided between the inner edge portion and the outer edge portion of the elastic member 30, two circumferentially extending portions 43 extending in the circumferential direction of the elastic member 30, and the circumferentially extending portions 43. And a single radially extending portion 44 that extends in the radial direction of the elastic member 30 and extends in the circumferential direction of the elastic member 30 as a whole.

The mass body 31 has a predetermined thickness in the vibration direction of the conductive member 27, is formed in an annular shape, and is made of a material having a relatively large specific gravity. When the mass bodies 31 are overlapped with each other, the outer shape of the mass bodies 31 is substantially equal to the shape of the inner peripheral surface of the mass body accommodating portion 32 as shown in FIGS. The mass bodies 31 are overlapped with each other, and the support bar 38 is press-fitted or inserted into the hole portion 41, so that the mass body 31 is attached to the mass body support portion 29 in a shape accommodated in the mass body accommodation portion 32.

In the vibration attenuator 5 having the above-described configuration, the frame main body 14 of the frame 11 and the bottom plate 22 of the yoke 19 are overlapped on a predetermined vibration attenuator mounting portion 9 of the inner panel 7, and the bolt 18 is passed through the through hole 16. It is attached to the inner panel 7 by being screwed into the weld nut 17. In this way, the predetermined vibration attenuator 5 is attached to the vibration attenuator attachment location 9 and the above-described damping mechanism 1 is assembled.

In the damping mechanism 1 configured as described above, when a sound current is supplied to the voice coil of the speaker 4 to vibrate the diaphragm 10 along the axis, the yoke of the speaker 4 is pivoted by the reaction of the vibration. It vibrates in the direction opposite to the vibration of the diaphragm 10 along the core. For this reason, the vibration of the yoke of the speaker 4 described above is transmitted to the inner panel 7 and the like, and each vibration attenuator mounting portion 9 of the inner panel 7 vibrates in the opposite direction to the diaphragm 10.

Then, the mass body 31 tries to stay in place according to the law of inertia. Therefore, the elastic member 30 is elastically deformed, and the mass body 31 vibrates relative to the inner panel 7, the magnetic circuit unit 12, and the frame 11 in the direction opposite to the vibration direction of the inner panel 7 described above. Further, by making the resonance frequency of the vibration attenuator 5 substantially the same as the resonance frequency of each vibration attenuator mounting portion 9, the mass body 31 of the vibration attenuator 5 can move with respect to the vibration direction of the inner panel 7. In the opposite direction, the inner panel 7 vibrates.

Further, since the conductive member 27 is disposed in the magnetic gap G of the magnetic circuit unit 12, an induced electromotive force is generated in the conductive member 27 and an induced current is also generated. At this time, the induced current and the magnetic flux passing through the magnetic gap act, and the conductive member 27 generates an electromagnetic force (Lorentz force) that attenuates the vibration of the mass body 31 with respect to the magnetic circuit portion 12 described above. Due to this electromagnetic force, a part of the inner panel 7 is pulled or pushed in the direction opposite to the vibration direction of the inner panel 7 by the vibration of the mass body 31.

For example, when the vibration attenuator mounting portion 9 of the inner panel 7 is displaced along the arrow P1 in FIG. 1, the Lorentz force described above follows the arrow P2 opposite to the arrow P1 due to the inertia of the mass body 31. Then, the inner panel 7 is pushed. Further, when the inner panel 7 is displaced along the arrow P2 in FIG. 1, due to the inertia of the mass body 31, the Lorentz force described above pulls the inner panel 7 along the arrow P1 opposite to the arrow P2. Become.

For this reason, the vibration attenuator 5 can quickly attenuate the vibration of the inner panel 7 described above, which is caused by a reaction when the diaphragm 10 is vibrated.

According to the present embodiment, the elastic member 30 is provided so as to be able to vibrate with respect to the magnetic circuit unit 12, and the vibrating unit 13 provided with the conductive member 27 disposed in the magnetic gap G of the magnetic circuit unit 12 includes: The mass body 31 is attached. For this reason, the mass body 31 vibrates in the direction opposite to the direction in which the inner panel 7 vibrates at the resonance frequency defined by the mass of the mass body 31 and the spring constant of the elastic member 30. At this time, the conductive member 27 arranged in the magnetic gap G vibrates, and an induced electromotive force is generated in the conductive member 27. An electromagnetic force acts on the conductive member 27 by the induced current generated in the conductive member 27 due to the generation of the induced electromotive force and the magnetic flux passing through the magnetic gap G. The vibration of the conductive member 27 due to the electromagnetic force is transmitted to the mass body 31, and the vibration of the inner panel 7 is attenuated. Further, the electromagnetic force acting on the conductive member 27 is naturally generated when the mass body 31 vibrates at various frequencies. For this reason, the vibration frequency of the mass body 31 and the inner panel 7 is different only from each other and is not equal to 180 degrees, in other words, the vibration directions are completely opposite to each other. Even if not, the vibration of the inner panel 7 can be attenuated.

As described above, the vibration attenuator 5 attenuates the vibration of the mass body 31, that is, the inner panel 7, by the electromagnetic force generated in the conductive member 27 due to the elastic deformation of the elastic member 30 and the vibrations defined by the various frequencies described above. In the vibration attenuator 5, the above-described electromagnetic force is generated by vibrations defined at various frequencies. Therefore, the magnetic circuit unit 12 has a frequency different from the resonance frequency determined by the mass of the mass body 31 and the spring constant of the elastic member 30. On the other hand, since the mass body 31 vibrates, vibrations defined by various frequencies of the inner panel 7 can be attenuated.

Furthermore, since the damping mechanism 1 described above attenuates vibrations not only by the elastic member 30 but also by the electromagnetic force of the conductive member 27, the conductive member 27 is naturally less likely to deteriorate over time than the elastic member. Thus, the vibration of the inner panel 7 can be attenuated. Further, since the temperature dependence of the damping characteristic with respect to the temperature around the vibration attenuator 5 is relatively small, the vibration of the inner panel 7 can be stably damped.

Further, the damping mechanism 1 includes the vibrating part 13 including a mass body support part 29 and a conductive member support part 28. For this reason, since the vibration part 13 is divided | segmented into the member which supports the mass body 31, and the member which supports the electroconductive member 27, it becomes easy to assemble the mass body 31 and the electroconductive member 27, and becomes easy to assemble.

Furthermore, the conductive member support 28 has a conductive member 27 attached to one end and a mass support 29 attached to the other end. For this reason, the conductive member 27 can be disposed in the magnetic gap G, and the mass body support portion 29 can be assembled to the conductive member support portion 28.

Further, the mass body support portion 29 includes a mass body accommodation portion 32 that accommodates the mass body 31. For this purpose, the mass body 31 can be attached to the mass body support portion 29.

A through-hole 33 is provided in the mass support part 29. For this reason, when the mass body 31, that is, the mass body support portion 29 vibrates, the pressure in the first space K surrounded by the magnetic circuit portion 12, the conductive member support portion 28, and the mass body support portion 29 changes. In addition, gas enters and exits through the above-described through-hole 33, and it is possible to prevent the vibration of the mass body support portion 29, that is, the mass body 31 from being hindered by the change in the pressure of the first space K described above. Therefore, the mass body 31 can be vibrated, and the vibration of the inner panel 7 can be attenuated.

The through hole 33 is provided on the inner peripheral side of the conductive member support portion 28. For this reason, the through-hole 33 can be communicated with the inside and outside of the first space K surrounded by the magnetic circuit portion 12, the conductive member support portion 28, and the mass body support portion 29, and the mass body 31 can be vibrated. The vibration of the inner panel 7 can be attenuated.

The yoke 19 of the magnetic circuit unit 12 has a first space K (a space formed inside the conductive member support 28) surrounded by the yoke 19 and the mass support unit 29 and a first gap opened to the magnetic gap G. A yoke through hole 26 is provided. Further, the magnetic gap G communicates the space formed between the plate 21, the elastic member 42, and the conductive member support portion 28 with the first yoke through hole 26. For this purpose, in addition to the through hole 33, a first space K (a space formed inside the conductive member 27) in which the first yoke through hole 26 is formed inside the conductive member 27 and a magnetic gap G are formed. The space formed outside the conductive member 27 (the second space, the space formed outside the conductive member 27) is communicated with the magnetic circuit portion 12 through the vibration of the mass body 31. Even if the pressure in the first space K surrounded by the member support portion 28 and the mass support portion 29 changes, the gas enters and exits through the first yoke through hole 26 in addition to the through hole 33 described above. It is possible to prevent the vibration of the mass body support portion 29, that is, the mass body 31 from being hindered by the change in the pressure of the first space K.

A second yoke through hole 24 extending in the vibration direction is provided in the center pole 23 as a columnar portion of the yoke 19. For this reason, even when the mass body support portion 29 of the vibration attenuator 5 is attached to the inner panel 7 that is a member to be attached or the yoke 19 of the vibration attenuator 5 is attached to the inner panel 7, the vibration attenuation Since the through hole 33 is formed on the mass body support portion 29 side of the vessel 5 and the second yoke through hole 24 is formed on the yoke 19 side, the state where the space K (first space) communicates with the outside is ensured. can do. Further, the first yoke through hole 26 opens in the inner surface of the second yoke through hole 24, and the first yoke through hole 26 can communicate the inside and outside of the first space K described above.

The first yoke through hole 26 extends in a direction intersecting with the second yoke through hole 24 (orthogonal in the embodiment) and opens to the outer peripheral surface of the center pole 23. For this reason, the first yoke through hole 26 can communicate the inside and outside of the first space K described above.

The elastic member 30 is formed in an annular shape in which an inner edge is attached to the conductive member support portion 28 and an outer edge is attached to the magnetic circuit portion 12, and a slit 42 is provided between the inner edge and the outer edge. Yes. For this reason, the elastic member 30 becomes easy to elastically deform, and the mass body 31 can be vibrated at various frequencies.

The slit 42 provided in the elastic member 30 includes a circumferentially extending portion 43 extending in the circumferential direction of the elastic member 30 and a radially extending portion 44 extending in the radial direction. Therefore, the slit 42 can easily elastically deform the elastic member 30.

* Multiple mass bodies 31 are attached. Therefore, by changing the number of mass bodies 31, the resonance frequency of vibration of the mass body 31, that is, the inner panel 7 that can be damped, can be changed as appropriate. Therefore, it is possible to attenuate vibrations of various frequencies of the inner panel 7.

The mass body accommodating portion 32 has a shape capable of changing the number of mass bodies 31 to be accommodated. For this reason, the number of mass bodies 31 can be easily changed, and the resonance frequency defined by the mass of the mass body 31 and the spring constant of the elastic member 30 can be changed. It can be surely attenuated.

The mass body accommodating portion 32 includes a support bar 38 that stands from the bottom surface portion 39 and enters the hole portion 41 of the mass body 31. For this reason, the number of mass bodies 31 can be easily changed, and vibrations of various frequencies of the inner panel 7 can be attenuated.

The inner diameter enlarged portion 25 is provided in the second yoke through hole 24, and the prefix cone portion 35 as the outer diameter reduced portion that has entered the inner diameter enlarged portion 25 is provided in the mass body accommodating portion 32. For this reason, the thickness of the entire vibration attenuator 5 can be made relatively small.

The conductive member 27 is formed in an annular shape and is disposed in the magnetic gap G. For this reason, the electromagnetic force generated in the conductive member 27 becomes uniform in the circumferential direction, and the vibration of the mass body 31 can be prevented from being uneven in the circumferential direction, and the vibration of the inner panel 7 can be attenuated. Further, by forming the conductive member 27 in an annular shape, or by winding the conductive member 27 along the magnetic gap G, the entire length of the conductive member 27 becomes relatively long, and the electrical resistance value becomes relatively small. Therefore, the induced electromotive force generated in the conductive member 27 can be relatively large, the amplitude of the conductive member 27 and the mass body to which the vibration of the conductive member 27 is transmitted are relatively large, and the vibration of the inner panel 7 can be satisfactorily performed. The vibration of the inner panel 7 can be attenuated in a relatively large frequency band. The conductive member 27 formed in an annular shape or wound may be short-circuited by connecting both ends thereof, and the short-circuit method is not particularly limited.

The mass body 31 is disposed at a position overlapping the yoke 19 of the magnetic circuit unit 12 with a gap. In addition, the mass body 31 is disposed on the plate 21, and the outer diameter of the mass body 31 is formed larger than the inner diameter of the plate 21, so that the magnetic circuit unit 12 prevents vibration of the mass body 31. This can be suppressed, and the vibration of the inner panel 7 can be attenuated. In addition, the outer diameter of the mass body 31 can be set to a desired outer diameter without considering the outer diameter of the magnetic circuit unit 12.

The damping mechanism 1 is a damping mechanism including an inner panel 7 and the above-described vibration attenuator 5 attached to the inner panel 7. For this reason, since the damping mechanism 1 includes the vibration attenuator 5 having the above-described configuration, it is possible to attenuate vibrations defined by various frequencies of the inner panel 7 and stably for many years. The vibration of the inner panel 7 can be attenuated. Further, since the temperature dependence of the damping characteristic with respect to the temperature around the vibration attenuator 5 is relatively small, the vibration of the inner panel 7 can be stably damped.

The resonance frequency of the inner panel 7 and the resonance frequency of the vibration attenuator 5 are substantially equal to each other. For this reason, the vibration attenuator 5 can attenuate the vibration of the inner panel 7. Note that the resonance frequencies in the present invention are substantially equal means that the resonance frequency of the inner panel 7 and the resonance frequency of the vibration attenuator 5 do not completely match the vibration of the inner panel 7. This indicates that these resonance frequencies are close enough to be attenuated.

A through hole 16 into which a bolt 18 for fixing the frame 11 to the inner panel 7 is inserted is formed in the outer edge portion of the frame 11 attached to the magnetic circuit portion 12. For this purpose, the frame 11, ie the vibration attenuator 5, can be attached to the inner panel 7.

Further, the present embodiment is an automobile 2 including the vibration attenuator 5 described above. For this reason, vibrations of the vehicle body of the automobile 2 can be attenuated.

In the above-described embodiment, the mass body 31 is attached to the mass body support portion 29 by the support rod 38. However, in the present invention, as shown in FIG. 8, a bolt 45 is provided instead of the support bar 38, and the bolt 45 passes through the hole 41 of the mass body 31 and is screwed into the bottom surface portion 39 of the mass body accommodating portion 32. Thus, the mass body 31 may be attached to the mass body support portion 29 by sandwiching the mass body 31 between the head 45 a of the bolt 45 and the bottom surface portion 39.

In the present invention, a plurality of the mass bodies 31 described above are provided. However, in the present invention, as shown in FIGS. 9 and 10, a plurality of mass bodies 31 are integrally formed to form a single mass body 31. good. 8 to 10, the same parts as those of the first embodiment described above are denoted by the same reference numerals and the description thereof is omitted.

In the first embodiment described above, the conductive member 27 is made of an annular solid material. However, in the present invention, as shown in FIG. 11, the outer periphery of one end portion of the conductive member support portion 28 is used as the conductive member. Alternatively, a coil 46 formed by winding a wire rod may be used. In the case shown in FIG. 11, the same parts as those in the first embodiment described above are denoted by the same reference numerals and the description thereof is omitted.

Both ends of the coil 46 are drawn to the outside in the magnetic gap G and connected by resistors 47 as a plurality of electric resistors. Each of the resistors 47 is a resistor having a constant electrical resistance value, and is arranged in parallel with each other and with the coil 46 in parallel. A switch 48 is provided between each resistor 47 and the coil 46. The electrical resistance values of the plurality of resistors 47 are different from each other. In the present embodiment, a plurality of switches 48 corresponding to a plurality of resistors 47 provided on a predetermined substrate and supported by a part of the vibration attenuator 5, for example, the frame 11, are arranged. When one switch 48 is closed and the other remaining switches 48 are opened, both ends of the coil 46 are connected by any one or a plurality of resistors 47 among the plurality of resistors 47.

In the case shown in FIG. 11, in addition to the matters described in the first embodiment, the conductive member is constituted by a coil 46 having both ends connected by a resistor 47. Therefore, by appropriately changing the electrical resistance value of the resistor 47, the strength of the electromagnetic force generated in the coil 46 as the conductive member can be changed as appropriate, and the desired electromagnetic force is generated in the coil 46. Thus, the characteristics for attenuating the vibration of the inner panel 7 can be adjusted.

Also, a plurality of resistors 47 are provided, and both ends of the coil 46 are connected by any one of the plurality of resistors 47. Therefore, by appropriately changing the resistor 47, the strength of the electromagnetic force generated in the coil 46 can be changed as appropriate, and a desired electromagnetic force can be generated in the coil 46, so that the vibration of the inner panel 7 can be reduced. The attenuation characteristic of the vibration attenuator 5 to be attenuated can be adjusted.

In the present invention, as shown in FIG. 12, a variable resistor 49 may be used as the electric resistor. In the case shown in FIG. 12, the same parts as those in the first embodiment and the case shown in FIG. The variable resistor 49 is connected to both ends of the coil 46.

In the case shown in FIG. 12, in addition to the effect of the first embodiment described above, the variable resistor 49 is provided as the electric resistor, so that the electric resistance value of the variable resistor 49 can be changed as appropriate. Thus, the strength of the electromagnetic force generated in the coil 46 can be changed as appropriate, a desired electromagnetic force can be generated in the coil 46, and the attenuation characteristic of the vibration attenuator 5 that attenuates the vibration of the inner panel 7 is adjusted. be able to.

In the embodiment described above, the yoke 19 and the frame 11 of the magnetic circuit unit 12 are attached to the inner panel 7. However, in the present invention, as shown in FIG. 7 may be attached. In this case, the second yoke through hole 24 formed in the yoke 19 communicates the outside with the first space K or the second space K2, and the vibration of the mass body 31 is caused in the first space K1. It can be prevented from being hindered by changes in gas pressure.

Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, as shown in FIG. 14, the frame 11 is attached to the magnet 20, the through

holes

24, 26, and 33 are not provided, and the mass body support portion 29 is replaced with an annular outer member 50 and a disk-shaped inner member 51, and the elastic member 30 is provided with a plurality of curved portions 52.

The outer member 50 is formed in an annular shape, an inner edge thereof is attached to the outer periphery of the other end portion of the conductive member support portion 28, and an outer edge is attached to the inner edge portion of the elastic member 30. The inner member 51 is stacked on the outer member 50 and attached to the outer member 50. A support bar 38 is erected at the center of the inner member 51. The outer diameter of a part of the outer member 50 and the inner 51, that is, the conductive member support portion 28 is formed sufficiently larger than the inner diameter of the plate 21. For this reason, the mass body support part 29 arrange | positions the mass body 31 in the position which mutually overlaps the mass body 31 along the axial center P as a vibration direction with the plate 21, and the magnetic circuit part 12 is the mass body 31. Can be prevented, and the vibration of the inner panel 7 can be attenuated. In addition, the outer diameter of the mass body 31 can be set to a desired outer diameter without considering the outer diameter of the magnetic circuit unit 12.

The elastic member 30 is provided with a plurality of curved portions 52 that are curved in a convex shape toward the axis P direction, that is, the vibration direction of the conductive member 27 in the cross section. In the illustrated example, the curved portion 52 convex toward the arrow P1 described above and the curved portion 52 convex toward the arrow P2 are arranged adjacent to each other. The mass body 31 is disposed on the plate 21 with a space from the plate 21, and the outer diameter of the mass body 31 is formed larger than the inner diameter of the plate 21.

In this embodiment, the elastic member 30 is provided with a curved portion 52. For this reason, since the elastic member 30 can be elastically deformed while providing the rigidity of the elastic member 30, it is possible to prevent the elastic member 30 from deteriorating over time, and to stably vibrate the inner panel 7 for many years. Can be attenuated.

In addition, the mass body 31 is disposed at a position overlapping the yoke 19 of the magnetic circuit unit 12 with a gap. For this reason, since the magnetic circuit part 12 does not prevent the vibration of the mass body 31, the vibration of the inner panel 7 can be attenuated.

Next, a third embodiment of the present invention will be described with reference to FIG. The same parts as those in the first and second embodiments described above are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, as shown in FIG. 15, two magnets 20 are provided, and the yoke 19 including the bottom plate 22 and the outer peripheral cylindrical portion 53 is provided without providing the frame 11. The outer peripheral cylindrical portion 53 of the yoke 19 is erected from the outer edge of the bottom plate 22 to receive the mass body accommodating portion 32, and the bottom plate 22 overlaps one magnet 20 on the surface facing the mass body accommodating portion. The magnetic circuit unit 12 is configured by sequentially arranging the plate 21 and the other magnet 20 on one magnet 20.

Then, the inner diameter of the conductive member support portion 28 is made larger than the outer diameters of the magnet 20 and the plate 21, the outer diameter of the conductive member support portion 28 is made smaller than the inner diameter of the outer peripheral cylinder portion 53, and the magnetic gap G is formed on the plate. 21 and the outer peripheral cylinder portion 53. Further, the outer diameter of the bottom plate 22 of the yoke 19 that supports the magnet 20 and the plate 21 is formed in an annular shape (in the illustrated example, an annular shape) that is smaller than the outer diameter of the conductive member 27. The outer diameter of 53 is formed in an annular shape (annular in the illustrated example) larger than the outer diameter of the conductive member 27.

Further, the mass support portion 29 is provided with an annular flange portion 54 whose inner edge is connected to the outer peripheral surface of the mass body accommodating portion 32 and whose outer edge is attached to the inner peripheral surface of the other end portion of the conductive member support portion 28. The through hole 33 is provided in the flange portion 54. Furthermore, the mass body accommodating part 32 is arrange | positioned at the inner peripheral side of the magnet 20 and the plate 21, and the mass body 31 is arrange | positioned at the said inner peripheral side. An edge 55 having an outer edge attached to the inner edge of the bottom plate 22 and an inner edge attached to the outer edge of the bottom surface 39 is provided.

According to the present embodiment, the outer peripheral cylinder portion 53 is provided on the yoke 19 so as to stand from the outer edge of the bottom plate 22 and accommodate the mass body accommodation portion 32 as at least a part of the mass body support portion 29. For this reason, the thickness of the entire vibration attenuator 5 can be made relatively small.

Furthermore, a mass body 31 is arranged inside the magnet 20 and the plate 21 of the magnetic circuit unit 12. For this reason, the thickness of the entire vibration attenuator 5 can be made relatively small.

The mass body support portion 29 includes a mass body accommodating portion 32 that is disposed inside the magnet 20 and the plate 21 and accommodates the mass body 31. For this reason, since the mass body 31 can be arrange | positioned inside the magnet 20 and the plate 21 of the magnetic circuit part 12, the thickness of the vibration attenuator 5 whole can be made comparatively small.

In the above-described embodiment, the vibration attenuator 5 is attached to the inner panel 7 of the automobile door panel. However, in the present invention, the vibration attenuator 5 may be attached to a housing (attached member) of various electronic devices such as various display devices, air conditioners, and refrigerators. Furthermore, in this invention, you may attach the vibration attenuator 5 to the wall surface (attached member) of the room which comprises various buildings, etc.

According to the embodiment described above, the following damping mechanism 1 is obtained.

(Supplementary Note 1) In the vibration attenuator 5 that is attached to the inner panel 7 to which the speaker 4 is attached and attenuates the vibration of the inner panel 7,
A magnetic circuit unit 12;
A conductive member 27 disposed in the magnetic gap G of the magnetic circuit section 12;
The conductive member 27 is provided, and is provided so as to be able to vibrate with respect to the magnetic circuit portion 12 by the elastic member 30, and the vibration portion 13 to which the mass body 31 is attached is provided.
One of the magnetic circuit part 12 and the mass body 31 of the vibration part 13 is attached to the inner panel 7.

According to the remarks, the mass body 31 is attached to the vibrating portion 13 provided with the conductive member 27 provided in the magnetic gap G of the magnetic circuit portion 12 so as to be vibrated with respect to the magnetic circuit portion 12 by the elastic member 30. It is attached. By doing so, when the inner panel 7 vibrates, the mass body 31 tries to stay in place according to the law of inertia, the elastic member 30 is elastically deformed, and the mass body 31 vibrates with respect to the magnetic circuit portion 12. As a result, the vibration of the inner panel 7 is attenuated. At this time, the vibration of the mass member 31 is caused by the induced electromotive force generated in the conductive member 27 that vibrates in the magnetic gap G due to the vibration of the mass member 31 in addition to the elastic deformation of the elastic member 30. An electromagnetic force (Lorentz force) to be attenuated is generated. Of course, this electromagnetic force is also generated by vibrations defined at various frequencies of the mass body 31.

As described above, the vibration attenuator 5 attenuates the vibration of the mass body 31, that is, the inner panel 7, by the electromagnetic force generated by the elastic deformation of the elastic member 30 and the vibrations defined by the various frequencies described above. The vibration attenuator 5 generates the mass 31 with respect to the magnetic circuit unit 12 even at a frequency other than the frequency determined by the spring constant of the elastic member 30 because the electromagnetic force described above is generated by vibrations defined at various frequencies. It will vibrate. For this reason, the vibration attenuator 5 can vibrate the mass body 31 with respect to the magnetic circuit section at various frequencies as well as the frequency determined by the spring constant of the elastic member 30, and various frequencies of the inner panel 7 can be obtained. Can be damped.

Further, since the damping mechanism 1 described above attenuates vibrations not only by the elastic member 30 but also by the electromagnetic force of the conductive member 27, the conductive member 27 is less likely to deteriorate over time than the elastic member. The vibration of the inner panel 7 can be attenuated stably.

It should be noted that the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications or a combination of a part of the techniques in each embodiment can be implemented without departing from the scope of the present invention.

1 Damping mechanism 4 Speaker 5 Vibration attenuator 7 Inner panel (attached member)
11 Frame 12 Magnetic circuit portion 13 Vibration portion 16 Through hole 18 Bolt (bolt)
19 Yoke 20 Magnet 21 Plate 22 Bottom plate (Bottom)
23 Center pole (columnar part)
24 Second yoke through hole 25 Inner diameter enlarged portion 26 First yoke through hole 27 Conductive member 28 Conductive member support portion 29 Mass body support portion 30 Elastic member 31 Mass body 32 Mass body accommodation portion 35 Prefix conical portion (outer diameter reduction portion)
38 Support Rod 39 Bottom Part 41 Hole 42 Slit 43 Circumferential Extension 44 Radial Extension 46 Coil (Conductive Member)
47 Resistor (electric resistor)
49 Variable resistor (electric resistor)
52 curved portion 53 outer peripheral cylindrical portion K first space K2 second space G magnetic gap

Claims

In a vibration attenuator that is attached to a mounted member to which a speaker is mounted and attenuates the vibration of the mounted member,
A magnetic circuit section;
A conductive member disposed in a magnetic gap of the magnetic circuit unit;
The conductive member is provided, and is provided so as to be able to vibrate with respect to the magnetic circuit portion by an elastic member, and a vibration portion to which a mass body is attached,
One of the said magnetic circuit part and the said mass body of the said vibration part is attached to the said to-be-attached member, The vibration attenuator characterized by the above-mentioned.
The vibrating part is
A mass support unit to which the mass is attached;
A conductive member support part to which the conductive member is attached and the mass body support part is attached;
The vibration attenuator according to claim 1, comprising:
3. The vibration attenuator according to claim 2, wherein the conductive member support portion has the conductive member attached to one end thereof and the mass body support portion attached to the other end thereof.
4. The vibration attenuator according to claim 3, wherein the mass body support portion includes a mass body accommodating portion that is formed in a cylindrical shape and accommodates the mass body.
The through hole which connects the 1st space enclosed with the said mass body support part, the said magnetic circuit part, and the said electrically-conductive member and the exterior has penetrated the said mass body support part, It is characterized by the above-mentioned. Item 5. The vibration attenuator according to Item 4.
6. The vibration attenuator according to claim 5, wherein the through-hole is disposed inside a position where the conductive member is attached to the mass body support portion.
The magnetic circuit unit comprises a magnet, a magnetic gap formed between the yoke and the plate;
The first space is formed inside the conductive member;
A second space surrounded by the mass body support portion, the magnetic circuit portion, and the conductive member is formed outside the conductive member,
The yoke is provided with a first yoke through-hole that opens to the first space side and the magnetic gap side,
The vibration attenuator according to claim 6, wherein the first space and the second space communicate with each other through the first yoke through hole and the magnetic gap.
The vibration attenuator according to claim 7, wherein the second space is surrounded by the mass body support portion, the plate, and the conductive member.
The yoke includes a flat bottom surface portion and a columnar portion erected from the center of the bottom surface portion,
The columnar part is provided with a second yoke through hole extending along the vibration direction of the vibration part,
The vibration attenuator according to claim 8, wherein the second yoke through hole is open on a surface side of the bottom surface portion facing the outside.
10. The vibration attenuator according to claim 9, wherein the first yoke through hole extends along a direction intersecting the second yoke through hole and opens on an outer peripheral surface of the columnar portion. .
The elastic member is formed in an annular shape, an inner edge portion of the elastic member is attached to the conductive member support portion, an outer edge portion of the elastic member is attached to the magnetic circuit portion, and the inner edge portion and the outer edge portion The vibration attenuator according to claim 9, wherein a slit extending in a circumferential direction of the elastic member is provided between the first and second portions.
The said slit is comprised by the circumferential direction extension part extended in the circumferential direction of the said elastic member, and the radial direction extension part extended in the radial direction of the said elastic member, It is characterized by the above-mentioned. The described vibration attenuator.
11. The vibration attenuator according to claim 10, wherein the elastic member is provided with a curved portion that curves in a convex shape toward the vibration direction of the vibration portion.
The vibration attenuator according to claim 11, wherein a plurality of the mass bodies are provided.
The mass body accommodating portion has a shape that allows the number of the mass bodies accommodated in the mass body accommodating portion to be changed,
The vibration attenuator according to claim 14, wherein the mass body is housed in the mass body housing portion in a state in which the mass body can be detached from the mass body housing portion.
The vibration attenuator according to claim 15, wherein the mass body accommodating portion includes a support bar that stands up from a bottom surface portion thereof and enters the hole of the mass body.
17. The vibration attenuator according to claim 16, wherein the yoke is provided with an outer peripheral cylindrical portion standing from an outer edge of the bottom surface portion and accommodating at least a part of the mass body support portion.
The second yoke through hole is provided with an inner diameter enlarged portion whose inner diameter increases toward the mass body supporting portion,
18. The mass body accommodating portion of the mass body support portion is provided with an outer diameter reducing portion that decreases in outer diameter toward the yoke and enters into the inner diameter enlarged portion. Vibration attenuator.
The vibration attenuator according to claim 18, wherein the conductive member is formed in an annular shape and is disposed in the magnetic gap.
19. The vibration attenuator according to claim 18, wherein the conductive member is a coil wound around an outer periphery of a conductive member support portion and connected at both ends to an electric resistor.
The vibration according to claim 20, wherein a plurality of electrical resistors having different resistance values are provided as the electrical resistors, and both ends of the coil are connected to one of the plurality of electrical resistors. Attenuator.
The vibration attenuator according to claim 20, wherein a variable resistor is provided as the electric resistor.
The magnetic circuit unit includes a yoke, a magnet supported by the yoke, and an annular plate,
The mass body is disposed on the plate, and an outer diameter of the mass body is formed larger than an inner diameter of the plate.
The vibration attenuator according to claim 1, wherein the vibration attenuator is disposed at a position overlapping the plate with a gap.
The magnetic circuit unit includes an annular magnet having an outer diameter smaller than the outer diameter of the conductive member and a yoke that supports a plate, and the mass body is disposed on an inner peripheral side of the magnet and the plate. The vibration attenuator according to claim 2.
25. The vibration attenuator according to claim 24, wherein the mass body support portion includes a mass body accommodating portion that is formed in a cylindrical shape and accommodates the mass body.
A mounted member with a speaker attached thereto;
The vibration attenuator according to claim 1 attached to the attached member,
One of the said magnetic circuit part with which the said vibration attenuator is equipped, and the said vibration part is attached to the said to-be-attached member, The damping mechanism characterized by the above-mentioned.
27. The damping mechanism according to claim 26, wherein a resonance frequency of the mounted member and a resonance frequency of the vibration attenuator are substantially equal to each other.
The magnetic circuit portion is supported by a frame attached to the attached member,
27. The damping mechanism according to claim 26, wherein a through-hole into which a fixture for fixing the frame and the attached member is inserted is formed in an outer edge portion of the frame.
An automobile comprising the vibration attenuator according to claim 1.
An electronic device comprising the vibration attenuator according to claim 1.
A building comprising the vibration attenuator according to claim 1.