WO2011158434A1

WO2011158434A1 - Vehicle-use speaker unit

Info

Publication number: WO2011158434A1
Application number: PCT/JP2011/002794
Authority: WO
Inventors: 浩一長谷川
Original assignee: 東海ゴム工業株式会社
Priority date: 2010-06-15
Filing date: 2011-05-19
Publication date: 2011-12-22

Abstract

A vehicle-use speaker unit of a novel structure is provided which is capable of achieving efficient output of sound waves while securing freedom of design without adversely affecting sound quality of an audio-use speaker. In a vehicle-use speaker unit (10), an output member (52) of an actuator (12) is affixed to a vehicle member (14) configuring a vehicle, and by directly vibrating the vehicle member (14) with the actuator (12), the output of the actuator (12) is exerted via the vehicle member (14).

Description

Speaker unit for vehicle

The present invention relates to a vehicle speaker unit used for reducing noise to a passenger compartment or for generating sound outside the vehicle.

Conventionally, as means for reducing vehicle interior noise, active noise control means has been proposed that cancels and reduces noise by outputting sound waves in the opposite phase to the vehicle interior noise detected by a microphone from a speaker. ing. For example, it is shown in Japanese Patent Application Laid-Open No. 2008-155845 (Patent Document 1).

By the way, a conventional speaker outputs a target sound wave by vibrating a diaphragm such as cone paper by an actuator using a voice coil. In order to output the power efficiently, it is desirable that the diaphragm is exposed to the passenger compartment. Therefore, the conventional speaker has an opening on the passenger compartment side, and generally the design is improved by covering the opening with a cover member (cloth or the like) having a mesh.

However, in such a conventional loudspeaker, even if a cover member is provided, it is inevitable that the design of the loudspeaker placement site is restricted, so a plurality of loudspeakers for noise control are provided. In addition, there is a possibility that realization of excellent design properties in a passenger compartment or the like may be hindered.

In Patent Document 1, in order to prevent an increase in the number of speakers arranged, it is also proposed to configure a noise control means that also serves as an audio speaker. If the sound wave is output, the sound quality of music or the like output from the audio may be deteriorated, which is not desirable.

JP 2008-155845 A

The present invention has been made in the background of the above-mentioned circumstances, and its solution is a speaker unit for a vehicle having a novel structure capable of efficiently outputting sound waves while ensuring the degree of freedom of design. Is realized and provided without adversely affecting the sound quality of the audio speaker.

In other words, a first aspect of the present invention is a vehicle speaker unit, in which an output member of an actuator is fixed to a vehicle member constituting the vehicle, and the vehicle member is directly excited by the actuator. Thus, the output of the actuator is caused to act via the vehicle member.

In the vehicle speaker unit having the structure according to the first aspect, a vehicle member such as an instrument panel is directly vibrated by an actuator, and the vehicle member replaces a diaphragm such as cone paper. It has come to be used as. Therefore, even when a sound generation function or a mute function is provided by the speaker unit, it is possible to prevent the design of the portion where the speaker unit is mounted from being significantly restricted, and to realize interiors and exteriors with excellent design characteristics. .

In addition, if a member exposed in a space to be pronounced or silenced is selected as a vehicle member, the generation or reduction of sound due to vibration of the vehicle member can be reduced in the target space without being reduced by the action of other members. Efficiently realized.

In addition, a speaker unit for sound generation or mute can be provided separately from the speaker unit for audio without adversely affecting the design. Therefore, the target sound can be generated or the sound can be reduced without adversely affecting the sound quality of the audio speaker unit.

Further, in the vehicle speaker unit according to this aspect, since there is no need to provide a diaphragm, it is possible to reduce the number of components and to save space in the arrangement area, thereby reducing the weight of the vehicle. And downsizing can be realized.

According to a second aspect of the present invention, in the vehicle speaker unit described in the first aspect, the vehicle speaker unit is used as a vehicle noise reduction means that reduces noise by actively acting on room noise of the vehicle. It is.

According to the second aspect, the vehicle noise is vibrated and the vibration force is actively applied to the vehicle interior noise, so that the room noise can be offset and reduced. In particular, by using the vehicle member as a diaphragm, it is possible to arrange a speaker unit for noise reduction without affecting the interior of the passenger compartment.

According to a third aspect of the present invention, in the vehicle speaker unit described in the first or second aspect, the vehicle member is a panel member disposed between a power unit and a passenger cabin head. It is what.

According to the third aspect, the panel member disposed on the path from the power unit, which is a noise source, to the occupant's listening point is vibrated by the actuator. Thereby, the vibration of the panel member which transmits the noise emitted from the power unit to the passenger compartment side is reduced by the actuator, and the propagation of the noise vibration can be efficiently reduced.

According to a fourth aspect of the present invention, in the vehicle speaker unit described in any one of the first to third aspects, the vehicle member is a body member constituting an engine room.

According to the fourth aspect, it is possible to suppress the noise emitted from the power unit from being transmitted from the engine room to the outside. Therefore, it is possible to prevent the noise of the power unit from being transmitted to a passenger or a person outside the vehicle.

According to a fifth aspect of the present invention, in the vehicle speaker unit described in the first or second aspect, the vehicle member is a constituent member of a headrest.

According to the fifth aspect, by oscillating the component of the headrest located near the head of the occupant, the noise propagated as air vibrations in the passenger compartment is excited near the occupant's listening point. Offset based on force. As a result, it is possible to prevent noise from being propagated to the passenger's ears in the seated state, thereby substantially ensuring quietness. In particular, the use of a vehicle speaker unit that uses a vehicle member (here, a component of a headrest) eliminates the need for a large arrangement area, and even a relatively small component such as a headrest. An arrangement | positioning area | region can be ensured easily. *

According to a sixth aspect of the present invention, in the vehicle speaker unit described in the first aspect, the vehicle member is an exterior product of a vehicle, and the exterior product is vibrated by the actuator. It is designed to emit an audible sound.

According to the sixth aspect, for example, when a pedestrian or the like hardly senses the approach of a vehicle due to a very low sound during driving, such as an electric car, a sound in an audible frequency range is emitted around the pedestrian. Thus, it is possible to make a pedestrian or the like recognize the approach of the vehicle. Therefore, by adopting the vehicle speaker unit of the present invention and using a vehicle exterior as a vehicle member, the sound is transmitted to surrounding pedestrians and the like without being attenuated by other members, and more effective. The vehicle can be recognized automatically.

Moreover, by arranging the actuator inside the exterior product, it is possible to arrange the speaker unit for sound generation without restricting the appearance of the vehicle, so that it is possible to realize a vehicle with an excellent appearance design. It becomes possible.

According to a seventh aspect of the present invention, in the vehicle speaker unit described in any one of the first to sixth aspects, a mass member is attached to the output member of the actuator.

According to the seventh aspect, by adjusting the resonance frequency of the vehicle member according to the mass of the mass member, various vehicle members can be vibrated by the actuator and used as the diaphragm of the speaker unit. It should be noted that the mass member may be replaceable, and the tuning of the resonance frequency of the vehicle member is further facilitated, so that versatility can be improved.

An eighth aspect of the present invention is the vehicle speaker unit according to any one of the first to seventh aspects, wherein a mass member is attached to the output member of the actuator via an elastic member. It is what.

According to the eighth aspect, the vibration characteristics (for example, resonance frequency, vibration mode, etc.) of the vehicle member are appropriately changed and set by the action of the secondary vibration system constituted by the mass member and the elastic member that supports the mass member. Is possible. Therefore, for example, at the frequency of the noise in question, the vibration of the vehicle member is reduced by the action of the secondary vibration system, and the vehicle member is actively vibrated by the actuator, thereby reducing the noise more effectively. It becomes possible. Moreover, since the auxiliary vibration system is provided in the actuator, and it is not necessary to provide the auxiliary vibration system separately from the actuator for the vehicle member, the structure for mounting the auxiliary vibration system on the vehicle is simplified, and the mounting work Becomes easier.

According to a ninth aspect of the present invention, in the vehicle speaker unit described in any one of the first to eighth aspects, a vibration sensor for obtaining a reference signal is attached to the vehicle member. A control device for controlling the vibration of the actuator based on the signal is provided.

According to the ninth aspect, by directly detecting the vibration state of the vehicle member, the vehicle member can be vibrated according to the vibration state of the vehicle member when actively vibrating the vehicle member with the actuator. . Thereby, the vibration of the vehicle member can be controlled with higher accuracy, and the noise can be reduced more efficiently.

Furthermore, since the reference signal can be obtained based on the vibration state of the vehicle member that is the subject of vibration, errors due to time delay are reduced in the vibration control based on the reference signal. Therefore, control is facilitated and the control device can be simplified.

According to the present invention, the speaker unit can be configured without specially providing a diaphragm such as cone paper by directly vibrating the vehicle member by the actuator. Therefore, it is possible to effectively realize sound generation or mute without providing a hole in a vehicle member constituting a part of the interior or exterior of the vehicle, and prevent the design from being restricted by the arrangement of the speaker unit. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the vehicle speaker unit as 1st embodiment of this invention. The model figure explaining the mounting position to the vehicle of the speaker unit for vehicles shown by FIG. 1 by a side view. The model figure explaining the mounting position to the vehicle of the speaker unit for vehicles shown by FIG. 1 by planar view. The longitudinal cross-sectional view which shows the speaker unit for vehicles as 2nd embodiment of this invention. The longitudinal cross-sectional view which shows the vehicle speaker unit as 3rd embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 show a vehicle speaker unit 10 as a first embodiment of the present invention. The vehicle speaker unit 10 has a structure in which an actuator 12 is attached to an instrument panel (dashboard) 14 as a vehicle member. In the following description, the up and down direction means the up and down direction in FIG.

More specifically, the actuator 12 includes a stator 16 and a mover 18. The stator 16 has two upper and

lower coils

20a and 20b wound around the bobbin in the circumferential direction, and the

coils

20a and 20b are supplied with power from the external power supply device 21 to the

coils

20a and 20b. A magnetic field is formed around the.

Further, a cylindrical yoke member 22 is disposed around the

coils

20a and 20b. The yoke member 22 is a ferromagnetic body made of iron or the like, and includes an upper yoke 24 that covers the upper surface and outer peripheral surface of the coil 20a, a lower yoke 26 that covers the lower surface and outer peripheral surface of the coil 20b, and a lower surface of the coil 20a. And the intermediate yoke 28 covering the upper surface of the coil 20b.

Further, the upper yoke 24 and the intermediate yoke 28, and the intermediate yoke 28 and the lower yoke 26 are assembled in the periphery of the

coils

20a and 20b by being overlapped with each other on the outer peripheral side of the

coils

20a and 20b. Magnetic paths are formed around the

coils

20a and 20b by the yoke member 22 composed of 24, 26 and 28. Further, the upper yoke 24 and the intermediate yoke 28 and the intermediate yoke 28 and the lower yoke 26 are opposed to each other at a predetermined distance on the inner peripheral side of the

coils

20a and 20b, and a magnetic gap is formed at the opposed portions. ing. Thereby, the opposing part of each

yoke

24,26,28 is made into the magnetic

pole formation part

30a, 30b, 30c, 30d in which a magnetic pole is formed by the electric power feeding to

coil

20a, 20b. Note that the N pole and the S pole of the magnetic

pole forming portions

30a, 30b, 30c, and 30d are switched by switching the direction of the current flowing through the

coils

20a and 20b.

Thus, the mover 18 is inserted into the center hole of the substantially cylindrical stator 16 having the structure in which the yoke member 22 is assembled around the

coils

20a and 20b. The mover 18 has a structure in which a permanent magnet 36 is sandwiched between an upper magnetic pole member 32 and a lower magnetic pole member 34.

The upper magnetic pole member 32 and the lower magnetic pole member 34 are both made of a ferromagnetic material such as iron and have a substantially annular block shape. Further, a flange-shaped magnetic pole portion 38a is integrally formed at the lower end portion of the upper magnetic pole member 32 and protrudes to the outer peripheral side, and a flange-shaped magnetic pole portion 38b is integrally formed at the upper end portion of the lower magnetic pole member 34 so as to be on the outer peripheral side. Protruding.

The upper magnetic pole member 32 and the lower magnetic pole member 34 are disposed on the same central axis at a predetermined distance in the vertical direction, and a permanent magnet 36 is interposed between the axially opposed surfaces of the upper and lower

magnetic pole members

32 and 34. It is arranged. The permanent magnet 36 has a substantially cylindrical shape and is extrapolated to a substantially cylindrical sleeve 40 formed of a nonmagnetic material, and the

magnetic pole members

32 and 34 are on the same central axis as the upper and lower

magnetic pole members

32 and 34. Between the opposite surfaces in the axial direction.

Further, the permanent magnet 36 is magnetized in the axial direction, and in this embodiment, the upper end of the permanent magnet 36 is an N pole and the lower end is an S pole. The

magnetic pole members

32 and 34 are superposed on the permanent magnet 36 from above and below, so that a magnetic path is formed by the upper and lower

magnetic pole members

32 and 34. As a result, the

magnetic pole portions

38 a and 38 b of the upper magnetic pole member 32 and the lower magnetic pole member 34 are magnetized by the permanent magnet 36, so that the N pole is formed in the magnetic pole portion 38 a of the upper magnetic pole member 32 and the lower magnetic pole member 34. An S pole is formed in the magnetic pole portion 38b.

The movable element 18 having such a structure is inserted and arranged on the same central axis with respect to the stator 16, and is separated by a predetermined distance in the radial direction over the entire circumference. Further, the upper end and the lower end of the mover 18 are elastically connected to the stator 16 by

leaf springs

42a and 42b, respectively, and the mover 18 is displaced relative to the stator 16 in the axial direction. While being allowed, the relative displacement is limited by the elasticity of the

leaf springs

42a and 42b. At the initial position (relative position of the mover 18 with respect to the stator 16 when the

coils

20a and 20b are not energized) set by the elasticity of the

leaf springs

42a and 42b with respect to the stator 16, the mover 18 The magnetic pole portion 38a is positioned between the magnetic pole forming portion 30a and the magnetic pole forming portion 30b in the axial direction of the stator 16, and the magnetic pole portion 38b is positioned between the magnetic pole forming portion 30c and the magnetic pole forming portion 30d in the axial direction. Yes.

Further, a rod member 44 as an output shaft is inserted on the central axis of the mover 18 and the

leaf springs

42a and 42b. The rod member 44 is a bolt-shaped member having a head at the lower end, and a thread is engraved at the upper end portion. And it inserts in the hole formed in the radial direction center part of the needle | mover 18 and the leaf | plate springs 42a and 42b, and has penetrated these needle | mover 18 and leaf | plate springs 42a and 42b up and down.

Further, the upper end portion of the rod member 44 protrudes upward from the upper leaf spring 42a, and the vibration member 46 is attached to the protruding portion. The vibration member 46 has a small-diameter, substantially bottomed cylindrical shape, and is disposed above the leaf spring 42 a via a substantially cylindrical spacer 47. The vibration member 46 is connected to the mover 18 by inserting the upper end of the rod member 44 through a hole penetrating the bottom wall portion of the vibration member 46 and screwing a nut onto the rod member 44. It is integrated.

Further, the vibration member 46 is vulcanized and bonded to the connecting rubber elastic body 48. The connecting rubber elastic body 48 is a substantially circular plate-shaped rubber elastic body, and the peripheral wall portion of the vibration member 46 is overlapped and vulcanized and bonded to the inner peripheral surface, and the fixing member 50 is attached to the outer peripheral portion. It is vulcanized and bonded. The fixing member 50 has a substantially annular shape, and has a structure in which a flange-like support portion extends from the lower end of the cylindrical peripheral wall toward the radially outer side. The connecting rubber elastic body 48 is formed as an integrally vulcanized molded product including the vibration member 46 and the fixing member 50.

Further, the fixing member 50 is fixed to a housing 52 as an output member. The housing 52 is configured by combining a housing main body 54 and a lid member 56, and has a hollow, generally cylindrical box shape as a whole. The housing main body 54 has a substantially bottomed cylindrical shape as a whole, and an annular caulking piece 58 is integrally formed at the upper end. Further, a plurality of mounting bolts 60 are arranged on the bottom wall portion of the housing body 54 so as to protrude downward. On the other hand, the lid member 56 has a substantially dish-like shape in the reverse direction that opens downward, and an annular fixing piece 62 extending toward the outer peripheral side is integrally formed at the lower end of the peripheral wall portion.

Then, the opening of the housing main body 54 is covered with the lid member 56, and the annular caulking piece 58 is caulked and fixed to the annular fixing piece 62, so that the housing main body 54 and the lid member 56 are connected, and the housing 52 is It is configured. Furthermore, the support portion of the fixing member 50 is overlapped on the annular fixing piece 62 from below, and the fixing member 50 is caulked and fixed to the housing 52 and is sandwiched between the housing main body 54 and the lid member 56. Yes.

Note that a substantially annular plate-shaped stopper member 64 is superimposed on the fixing member 50 from below, and is fixed to the housing 52 together with the fixing member 50 by caulking. The inner peripheral edge portion of the stopper member 64 is disposed opposite to the outer peripheral edge portion of the vibration member 46 at a predetermined distance in the axial direction, and the displacement amount of the vibration member 46 is caused by the contact with the stopper member 64. It has come to be restricted.

Further, the stator 16 is attached to the housing 52. That is, the

yokes

24, 26, and 28 of the stator 16 are press-fitted and fixed to the housing body 54, and the stator 16 is supported by the housing 52.

Then, power is supplied from the outside to the

coils

20a and 20b of the stator 16, and magnetic poles are formed on the magnetic

pole forming portions

30a, 30b, 30c, and 30d on the stator 16, respectively. Attraction force or exclusion force acts between 30b, 30c, 30d and the

magnetic pole portions

38a, 38b on the movable element 18 side, and the movable element 18 is displaced relative to the stator 16 in the axial direction. Yes. It is movable by switching the N pole and S pole formed in the magnetic

pole forming portions

30a, 30b, 30c, and 30d by controlling the direction of the current flowing in the

coils

20a and 20b by adopting an alternating current or the like. The child 18 can be displaced back and forth. Further, by switching the presence / absence of power supply to the

coils

20a and 20b, it is possible to reciprocate the mover 18 using the restoring force based on the elasticity of the

leaf springs

42a and 42b and the connecting rubber elastic body 48. .

Further, a mass member 66 is attached to the housing 52. The mass member 66 has a thick, large-diameter, generally cylindrical shape, and is formed of a material having a high density such as iron. The mass member 66 is externally fitted to the housing body 54 and fixed by means such as welding. The lower end surface of the mass member 66 is located above the bottom surface of the housing main body 54.

A plurality of actuators 12 having such a structure are attached to the instrument panel 14 as shown in FIGS. 2 and 3, thereby constituting the vehicle speaker unit 10. That is, the mounting bolt 60 provided on the housing 52 of each actuator 12 is fastened with a nut to the instrument panel 14 that separates the engine room 70 in which the power unit 68 is disposed and the passenger compartment 72 in which the passenger is boarded. Has been. As a result, the housing 52 is fixed to the surface of the instrument panel 14 on the engine room 70 side, and the vehicle speaker unit 10 includes the actuator 12 and the instrument panel 14. The instrument panel 14 is disposed between the power unit 68 and the occupant's head, which is a listening point of noise, and is a panel member that blocks a noise propagation path from the power unit 68 to the occupant's head. ing.

In this embodiment, a vibration sensor 74 is attached to the instrument panel 14. The vibration sensor 74 transmits the vibration state of the instrument panel 14 to the control device 76 as a reference signal. The control device 76 controls the power supplied from the power supply device 21 to the

coils

20a and 20b based on the reference signal, so that the excitation of the actuator 12 is controlled according to the vibration state of the instrument panel 14. It has become. The control of the actuator 12 by the control device 76 may be feedback control based on the reference signal, but more preferably feedforward control based on the reference signal, thereby reducing noise vibration. On the other hand, an exciting force can be exerted without time delay. 1 and 3, the power supply device 21, the vibration sensor 74, and the control device 76 are schematically shown.

Then, when the electric power from the power supply device 21 is controlled by the control device 76 and supplied to the

coils

20a and 20b, the actuator 12 exhibits an exciting force. The reaction force of this excitation force is exerted on the instrument panel 14 via the housing 52, so that the instrument panel 14 is actively excited. At this time, the instrument panel 14 is vibrated in the opposite phase to the noise emitted from the power unit 68, and the noise vibration exerted from the power unit 68 to the instrument panel 14 is offset and reduced. Yes. As a result, the noise transmitted from the engine room 70 to the vehicle compartment 72 is reduced by the noise canceling action in the instrument panel 14 disposed on the propagation path, and the quietness of the vehicle compartment 72 is ensured. As is clear from this, in the present embodiment, the vehicle speaker unit 10 is used as a vehicle noise reduction means that directly vibrates the instrument panel 14 and actively acts on the noise of the passenger compartment 72. It has been.

Further, when the actuator 12 is fixed to the instrument panel 14 and the mass of the actuator 12 is added, the resonance frequency of the instrument panel 14 is shifted to the low frequency side. Thereby, the transmission rate of the engine noise to the vehicle interior 72 can be reduced by shifting the frequency of the engine noise and the resonance frequency of the instrument panel 14.

Moreover, since the mass member 66 is attached to the actuator 12, the resonance frequency of the instrument panel 14 can be shifted more greatly. Therefore, transmission of engine noise to the passenger compartment 72 can be more effectively reduced.

Further, the vibration characteristics of the actuator 12 are controlled by the vibration sensor 74 and the control device 76 according to the vibration state of the instrument panel 14. Thereby, the vibration of the instrument panel 14 due to the propagation of noise is efficiently canceled by the excitation force of the actuator 12, and the propagation of the noise to the vehicle interior 72 is effectively prevented.

Moreover, in this embodiment, both the actuator 12 and the vibration sensor 74 are mounted on the instrument panel 14, and the vibration state of the instrument panel 14 that is vibrated by the actuator 12 is directly detected by the vibration sensor 74. It is like that. Therefore, the time lag between the vibration of the instrument panel 14 and the vibration detected by the vibration sensor 74 can be reduced, and the control of the actuator 12 can be facilitated.

FIG. 4 shows a vehicle speaker unit 80 as a second embodiment of the present invention. The vehicle speaker unit 80 includes an actuator 82 and an instrument panel 14. In the following description, members and portions that are substantially the same as those of the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

More specifically, the actuator 82 includes a housing 84. The housing 84 is constituted by the housing main body 54 and the lid member 86, and has a hollow, generally cylindrical box shape as a whole.

The lid member 86 is a hard member having a thick, substantially disk shape. Further, an annular fixing portion 88 that projects downward and radially outward is integrally formed on the outer peripheral portion of the lid member 86. Then, the annular caulking piece 58 of the housing main body 54 is caulked and fixed to the annular fixing portion 88, whereby the housing main body 54 and the lid member 86 are connected, and the housing 84 is formed by the housing main body 54 and the lid member 86. Yes.

The lid member 86 is made of a thick metal material such as iron, and has a large mass. Thereby, the lid member 86 has a function as a mass member, and the mass of the entire actuator 82 is increased. Therefore, the resonance frequency of the instrument panel 14 can be shifted to a low frequency by mounting the actuator 82, and an effective noise reduction effect can be obtained.

Moreover, it is not necessary to provide the mass member as a separate member in the actuator 82, and the mass member is integrally provided in the housing 84. Therefore, the number of parts can be reduced, the number of manufacturing processes can be reduced, and the structure can be simplified.

FIG. 5 shows a vehicle speaker unit 90 as a third embodiment of the present invention. The vehicle speaker unit 90 includes an actuator 92 and an instrument panel 14. Further, the actuator 92 has a structure in which a plurality of dynamic dampers 94 are disposed on the outer peripheral surface of the housing 52.

More specifically, the dynamic damper 94 has a mass member 96. The mass member 96 has a thick, substantially cylindrical shape, and is a hard member formed of a material having a high density such as iron. The mass member 96 is disposed on the same central axis with respect to the peripheral wall portion of the housing main body 54, and is elastically connected to the housing main body 54 by a support rubber elastic body 98 as an elastic member. The support rubber elastic body 98 is a substantially cylindrical rubber elastic body, the inner peripheral surface of which is vulcanized and bonded to the outer peripheral surface of the peripheral wall portion of the housing body 54, and the outer peripheral surface is the inner periphery of the mass member 96. Vulcanized to the upper end of the surface.

In the vehicle speaker unit 90 including the actuator 92 having such a structure, the vibration vibration of the actuator 92 is exerted on the instrument panel 14 via the housing 52, so that the noise vibration is canceled in the instrument panel 14. Reduced.

Further, the dynamic damper 94 provided in the actuator 92 reduces the vibration of the instrument panel 14 in the noise frequency range, and the propagation of the noise to the vehicle interior 72 is more effectively reduced. . That is, the mass member 96 elastically connected to the instrument panel 14 via the housing 52 is displaced so as to cancel the vibration of the instrument panel 14 due to the propagation of noise, thereby reducing the vibration energy of the instrument panel 14. The As a result, the noise transmitted to the passenger compartment 72 through the instrument panel 14 is further reduced, and the quietness of the passenger compartment 72 is ensured.

As mentioned above, although embodiment of this invention has been explained in full detail, this invention is not limited by the specific description. For example, the vehicle member is not limited to the instrument panel 14, and other members can be used as the vehicle member by changing the mounting portion of the actuator 12 in the vehicle.

Specifically, for example, as shown by a two-dot chain line in FIG. 2, the actuator 12 is mounted on the wall portion 100 of the engine room 70 that separates the engine room 70 and the vehicle compartment 72, and a part of the body member The wall part 100 which comprises may be utilized as a vehicle member. According to this, it is possible to prevent the noise of the power unit 68 from being propagated from the engine room 70 to the vehicle compartment 72 by reducing the vibration of the wall portion 100 of the engine room 70. In particular, if the vehicle speaker unit 10 using the instrument panel 14 is used in combination, noise from the power unit 68 can be more effectively prevented.

Further, for example, as indicated by a two-dot chain line in FIG. 2, the actuator 12 may be attached to the headrest 102 of the seat 101 and the headrest 102 may be used as a vehicle member. That is, when the headrest 102 is vibrated by the actuator 12, a sound wave is generated, and the noise propagated in the passenger compartment 72 is canceled in the vicinity of the head (ear) of the passenger. According to this, the vibration of the headrest 102 located near the head is vibrated, so that the cancellation of noise vibration near the head is efficiently realized. In addition, not only the noise from the power unit 68 but also various noises in the passenger compartment 72 including road noise can be widely exhibited. When the purpose is to reduce the noise near the head as described above, the predetermined vibration is propagated from the headrest 102 to the space near the head instead of canceling out the vibration of the headrest 102 itself. Thus, the actuator 12 is controlled by the controller 76.

Further, when used for the purpose of reducing the noise in the passenger compartment 72, in addition to the above, the actuator 12 can be mounted on a roof panel, a door panel, a chassis frame, etc., and these members can be used as vehicle members. . If these members are used as vehicle members, noise input from around the vehicle can be effectively reduced.

Further, the present invention is not necessarily provided for the purpose of reducing vehicle noise, and can be used, for example, to emit a sound for notifying nearby pedestrians of the approach of the vehicle. That is, as shown by a two-dot chain line in FIG. 2, the actuator 12 is mounted inside the bonnet 104 as an exterior product, and a vehicle speaker unit using the bonnet 104 as a vehicle member may be configured. . According to this, when the bonnet 104 is vibrated by the actuator 12, a sound imitating an engine sound for notifying the approach of the vehicle, a sound for notifying the left or right turn of the vehicle, etc. can be emitted around the vehicle. . Note that the sound may be emitted constantly, or the sound may be emitted only when a pedestrian or the like is detected by a sensor. In addition, the vehicle member employed when sound is emitted to the outside is not limited to the bonnet 104, and can be used by appropriately selecting an exterior product of the vehicle, for example, a fender or an outside mirror. , Door panels, bumper covers, etc. can be used.

Further, the specific structure of the actuator is not interpreted as being limited to the structure of the actuator 12 shown in the embodiment. For example, an actuator using a known magnetostrictive element or electrostrictive element, an actuator using a solenoid, or the like can be suitably employed.

In the above embodiment, the output member is configured by the housing 52 attached to the stator 16 side. However, the output member can be provided on the movable element 18 side. In other words, the rod member 44 fixed to the mover 18 extends through the housing 52 and extends to the outside, and the rod member 44 is attached to a vehicle member such as the instrument panel 14 to constitute an output member. It may be. In this case, the housing 52 is allowed to be displaced relative to the instrument panel 14.

Moreover, in the said embodiment, although the mass member was supported by the housing 52 fixed to the instrument panel 14, the mass member is provided in the needle | mover 18 side in which the relative displacement with respect to the instrument panel 14 was permitted. Also good. According to this, the excitation force of the actuator 12 can be efficiently applied to the instrument panel 14, and an increase in the excitation force and a reduction in size can be realized. Furthermore, when a mass member is provided on the movable element 18 side, the mass member may be elastically supported on the movable element 18 side via a support rubber elastic body to constitute a secondary vibration system. Even if such a structure is adopted, the excitation efficiency of the instrument panel 14 can be improved, and sound can be emitted efficiently or noise can be effectively eliminated.

Further, the present invention is not only applied to automobiles, but can be applied to, for example, motorcycles, railway vehicles, industrial vehicles, and the like.

10: Speaker unit for vehicle, 12, 82, 92: Actuator, 14: Instrument panel (panel member), 52, 84: Housing (output member), 66, 96: Mass member, 70: Engine room, 74: Vibration Sensor: 76: Control device, 98: Support rubber elastic body (elastic member), 100: Wall part (body member), 102: Headrest, 104: Bonnet (exterior product)

Claims

A vehicle speaker unit,
An output member of an actuator is fixed to a vehicle member constituting the vehicle, and the vehicle member is directly vibrated by the actuator, thereby causing the output of the actuator to act via the vehicle member. A vehicle speaker unit.
The vehicle speaker unit according to claim 1, wherein the vehicle speaker unit is used as vehicle noise reduction means for reducing noise by actively acting on room noise of the vehicle.
The vehicle speaker unit according to claim 1 or 2, wherein the vehicle member is a panel member disposed between a power unit and a passenger cabin head.
The vehicle speaker unit according to any one of claims 1 to 3, wherein the vehicle member is a body member constituting an engine room.
The vehicle speaker unit according to claim 1 or 2, wherein the vehicle member is a constituent member of a headrest.
The vehicle speaker unit according to claim 1, wherein the vehicle member is an exterior product of a vehicle, and the exterior product emits an audible sound when vibrated by the actuator.
The vehicle speaker unit according to any one of claims 1 to 6, wherein a mass member is attached to the output member of the actuator.
The vehicle speaker unit according to any one of claims 1 to 7, wherein a mass member is attached to the output member of the actuator via an elastic member.
The vehicle according to any one of claims 1 to 8, wherein a vibration sensor that obtains a reference signal is attached to the vehicle member, and a control device that controls the actuator based on the reference signal is provided. Speaker unit.