JP5076828B2 - Door structure - Google Patents

Description

  The present invention relates to a door structure in which a speaker unit is mounted on an inner panel constituting a door, for example.

  Conventionally, the structure of a vehicle door is, for example, a structure formed from an outer panel disposed on the outer side of the vehicle and an inner panel attached to the outer panel and disposed on the inner side of the vehicle. A door space in which a motor for driving a power window and the like is disposed is formed between the outer panel and the inner panel. In this door space, a speaker unit connected to in-vehicle audio (car radio etc.) may be arranged.

As a door structure in which the speaker unit is disposed in the door space as described above, for example, there is a configuration as described in Patent Document 1.
In the door structure described in Patent Document 1, a first opening is formed in a door trim that covers the interior side of the inner panel, and a second opening is formed in the inner panel. In the trim space formed between the inner panel and the door trim, a first duct portion is formed that combines the inner panel and the door trim to partially partition the trim space. The first opening and the second opening communicate with each other through the first duct, and the door space communicates with the vehicle interior.

In such a door structure, sound waves output from the back side of the speaker unit resonate in the door space. Further, after the phase of the sound wave output from the back side of the speaker unit is reversed in the door space of the speaker unit, the sound wave output from the front side of the speaker unit is output to the vehicle interior through the first duct portion. And synthesized.
For this reason, it becomes possible to introduce the sound output from the back side of the speaker unit via the first duct portion into the vehicle interior with the phase reversed. Thereby, it is possible to enhance the sound output from the speaker unit.
JP 2006-281932 A

By the way, as a result of the output from the speaker, a part of the sound heard in the passenger compartment includes a sound generated by the vibration of the inner panel, which is generated by the sound pressure output from the back side of the speaker unit.
However, in the door structure described in Patent Document 1, since the opening is formed in the inner panel and the door trim, most of the energy of the sound output from the back side of the speaker unit is released from the opening into the vehicle interior. Is done. Therefore, the pressure fluctuation generated in the door space is suppressed, the vibration of the inner panel is suppressed, and there is a concern that it may be difficult to enhance sound.
The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a door structure that can efficiently vibrate an inner panel to efficiently enhance sound.

In order to solve the above-mentioned problems, the present invention is arranged in a door space formed by a speaker unit with a front side facing the vehicle compartment formed between an outer panel arranged on the vehicle exterior side and an inner panel arranged on the vehicle compartment side. Door structure,
A phase inversion sound obtained by inverting the phase of the sound output from the back side of the speaker unit is radiated to the door space to vibrate the inner panel ,
A partition member that surrounds the back side of the speaker unit and forms a speaker arrangement space isolated from the door space, and the speaker arrangement space and the door space communicate with each other through at least two openings,
A first opening of the opening is opened to the speaker arrangement space, a second opening of the opening is opened to the door space, and is opposed to the inner panel. A door structure is provided.

  According to the present invention, it is possible to efficiently vibrate the inner panel by inverting the phase of the sound output from the back surface of the speaker unit and radiating it to the door space. Is possible.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
(Constitution)
FIG. 1 is a view of a front door 1 of an automobile formed using the door structure of the present embodiment as viewed from the vehicle interior side, and is a view showing a configuration concept of the front door 1. 2 is a cross-sectional view taken along line II-II in FIG. 1, and is a view of the front door 1 in FIG. 1 as viewed from above.
As shown in FIGS. 1 and 2, the front door 1 of this embodiment includes an outer panel 2, an inner panel 4, a speaker unit 6, an inner panel vibration means 8, and a door trim 10.

The outer panel 2 is arranged on the vehicle outer side than the inner panel 4. In the present embodiment, the material forming the outer panel 2 is, for example, a steel plate for automobiles.
The inner panel 4 is disposed on the vehicle compartment 12 side of the outer panel 2 by being attached to a surface of the outer panel 2 on the vehicle compartment 12 side using means such as welding. In the present embodiment, the material forming the inner panel 4 is, for example, a steel plate for automobiles, similar to the material forming the outer panel 2.

  The inner panel 4 is provided with a working opening 16. The work opening 16 is an opening used when a power window driving motor or the like (not shown) is disposed in the door space 14 formed between the outer panel 2 and the inner panel 4. The work opening 16 is preferably closed by using a steel plate or a resin plate (not shown) after the power window driving motor or the like is disposed. It is described on the assumption that is closed.

The speaker unit 6 is disposed in the door space 14. The speaker unit 6 is connected to an in-vehicle audio (not shown) such as a car radio. The speaker unit 6 has a function of outputting sound from the front side and the back side based on a signal input from the in-vehicle audio.
The front side of the speaker unit 6 is directed to the vehicle compartment 12 side by being attached to the inner panel 4 using a screw or the like (not shown).
The rear side of the speaker unit 6 is opposed to the outer panel 2 in the door space 14.

The inner panel vibration means 8 includes a partition wall member 18 and a communication member 20.
The partition wall member 18 is a box-shaped member having an opening on one surface, and the edge portion forming the opening surface is fixed to the inner panel 4 so as to surround the rear side of the speaker unit 6 and to be isolated from the door space 14. The speaker arrangement space 22 is formed. In this embodiment, the material for forming the partition member 18 is, for example, a resin material such as plastic. In addition, when selecting a resin material, you may select considering a desired acoustic characteristic and durability, for example. The same applies to the communication member 20 described later.

The speaker arrangement space 22 constitutes a space for resonating the sound output from the back side of the speaker unit 6 and inverting the phase of the sound output from the back side of the speaker unit 6 to form a phase-inverted sound. .
Here, the phase inversion sound is formed by inverting the phase of the sound output from the back side of the speaker unit 6, that is, the sound whose phase is inverted from the sound output from the front side of the speaker unit 6. . For this reason, the phase of the phase-reversed sound is in phase or substantially in phase with the phase of the sound output from the front side of the speaker unit 6.

The communication member 20 is a hollow member having two openings 24. In the present embodiment, the material forming the communication member 20 is, for example, a resin material such as plastic, like the partition member 18. In the present embodiment, the communication member 20 is integrally formed with the partition member 18.
The first opening 24 a is opened to the speaker arrangement space 22, and the second opening 24 b is opened to the door space 14. That is, the communication member 20 makes the speaker arrangement space 22 and the door space 14 communicate with each other.

Therefore, the phase inversion sound formed in the speaker arrangement space 22 is radiated to the door space 14 through the communication member 20, and the inner panel 4 is vibrated by the sound pressure.
As described above, the inner panel vibration means 8 radiates the phase inversion sound formed by reversing the phase of the sound output from the back side of the speaker unit 6 to the door space 14 and vibrates the inner panel 4. It has become.

The sound generated by the vibration of the inner panel 4 generated by the sound pressure output from the back side of the speaker unit 6 is mainly composed of an extremely low frequency region around 20 Hz among the sounds output from the speaker unit 6. It has become.
The door trim 10 is arranged on the vehicle compartment 12 side with respect to the inner panel 4. The door trim 10 is attached to the inner panel 4 so as to cover the vehicle compartment 12 side of the inner panel 4 and constitutes an interior material of the front door 1. In the present embodiment, the material forming the door trim 10 is a resin material.

Although not particularly illustrated, an armrest, a door pocket, and the like are disposed on the side of the vehicle compartment 12 of the door trim 10, and the main part thereof is integrally formed with the door trim 10 using a resin material in the same manner as the door trim 10. ing. Moreover, in FIG. 1, illustration of the door trim 10 is abbreviate | omitted for description.
In addition, the door trim 10 is formed with a trim-side opening 26 composed of a plurality of holes, for example. The trim side opening 26 is disposed at a position overlapping the front surface of the speaker unit 6 as viewed from the vehicle compartment 12 side, and introduces sound output from the front surface of the speaker unit 6 into the vehicle compartment 12.
Therefore, most of the sound output from the front side of the speaker unit 6 is introduced into the vehicle compartment 12 through the trim side opening 26.

(Operation)
Next, the operation of the vehicle provided with the front door 1 of the present embodiment will be described.
When using the in-vehicle audio when the vehicle is running or stopped, sound such as a radio program is output from the front side and the back side of the speaker unit 6 based on a signal input from the in-vehicle audio (see FIG. 2).
At this time, most of the sound output from the front side of the speaker unit 6 is introduced into the passenger compartment 12 through the trim side opening 26 (see FIG. 2).
On the other hand, the sound output from the back side of the speaker unit 6 is inverted in phase in the speaker arrangement space 22, and a phase inverted sound is formed by the inverted sound (see FIG. 2).
And the phase inversion sound formed in the speaker arrangement | positioning space 22 is radiated | emitted to the door space 14 through the communication member 20, and the inner panel 4 is vibrated with the sound pressure (refer FIG. 2).

Here, the phase of the phase-reversed sound is in phase or substantially in phase with the phase of the sound output from the front side of the speaker unit 6. For this reason, the inner panel 4 is vibrated by the sound pressure of the phase-reversed sound, and the phase of the sound produced by the inner panel 4 is in phase with or substantially in phase with the phase of the sound output from the front side of the speaker unit 6 ( (See FIG. 2).
Therefore, since the inner panel 4 vibrates efficiently due to resonance between the sound produced by the inner panel 4 and the sound output from the front side of the speaker unit 6, the sound output from the front side and the rear side of the speaker unit 6. Is increased (see FIG. 2).

(Effects of the first embodiment)
(1) In the front door formed using the door structure of the present embodiment, the phase of the sound output from the back side of the speaker unit is reversed by the inner panel vibration means to form a phase reversal sound. Sound is emitted into the door space and the inner panel is vibrated.
For this reason, when the inner panel is vibrated with the sound pressure of the phase-reversed sound, the phase of the sound produced by the inner panel is in phase with or substantially in phase with the phase of the sound output from the front side of the speaker unit.
Therefore, because the inner panel vibrates efficiently due to resonance between the sound produced by the inner panel and the sound output from the front side of the speaker unit, the sound output from the front side and the rear side of the speaker unit is increased. The

Here, the sound generated by vibrating the inner panel, which is generated by the sound pressure output from the back side of the speaker unit, is mainly composed of an extremely low frequency region around 20 Hz among the sounds output from the speaker unit. ing.
As a result, when the inner panel vibrates efficiently due to the resonance between the sound produced by the inner panel and the sound output from the front side of the speaker unit, the extremely low frequency region around 20 Hz is particularly enhanced. It becomes possible to improve the sound quality of the sound range.

(2) Further, in the front door formed using the door structure of the present embodiment, the inner panel vibration means communicates with the partition member that surrounds the back side of the speaker unit, the speaker arrangement space, and the door space. It is set as the structure provided with the member.
For this reason, since it becomes possible to radiate phase inversion sound to the door space without forming openings in the inner panel and the door trim, the inner panel can be vibrated efficiently.
As a result, the inner panel and the door trim can be easily shaped, and the degree of freedom in designing the inner panel and the door trim can be improved.
In addition, it is possible to radiate phase reversal sound to the door space without forming openings in the inner panel and door trim, thus preventing deterioration of sound insulation performance caused by the phase reversal sound entering the vehicle interior. It becomes possible to do.

(Application examples)
(1) In the present embodiment, the front door 1 formed using the door structure of the present invention has been described. However, the present invention is not limited to this, and the door structure of the present invention is applied to a rear door or a back door. May be.
(2) Moreover, although the front door 1 of the structure provided with the door trim 10 was demonstrated in this embodiment, it is not limited to this, The front door 1 which is not provided with the door trim 10 is not limited to this. You may apply to.
(3) Further, in the front door 1 formed using the door structure of the present embodiment, the work opening 16 is formed in the inner panel 4, but the invention is not limited to this, and the work opening is formed in the inner panel 4. The opening 16 may not be formed.

(4) Moreover, in the front door 1 formed using the door structure of this embodiment, although the partition member 18 and the communication member 20 were formed using resin materials, such as a plastic, it is not limited to this. . That is, the partition member 18 and the communication member 20 may be formed using a material other than a resin material such as wood. In this case, as in the case where the partition member 18 and the communication member 20 are formed using a resin material, a material for forming the partition member 18 and the communication member 20 is selected in consideration of, for example, desired acoustic characteristics and durability. It is also possible.

(5) Moreover, in the front door 1 formed using the door structure of this embodiment, the partition member 18 and the communication member 20 are integrally formed. However, the present invention is not limited to this. After the members 20 are molded separately, they may be combined with each other.
(6) Moreover, although this embodiment demonstrated the case where the door structure of this invention was applied to the door with which a vehicle is equipped, it is not limited to this, The door structure of this invention is used for a ship or an aircraft. You may apply to the door with which etc. are equipped.

(7) Moreover, in the front door 1 formed using the door structure of the present embodiment, the inner panel vibration means 8 is configured to include the partition wall member 18 and the communication member 20, but the present invention is not limited to this. is not. That is, for example, a structure may be employed in which an opening for communicating the speaker arrangement space 22 and the door space 14 is formed on a surface of the partition wall member 18 other than the surface facing the outer panel 2 and the inner panel 4.

(Second embodiment)
(Constitution)
Next, a second embodiment of the present invention will be described.
FIG. 3 is a view of the front door 1 of the automobile formed by using the door structure of the present embodiment as viewed from the vehicle interior side, and is a view showing the configuration concept of the front door 1. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, and is a view of the front door 1 in FIG. 3 as viewed from above.
As shown in FIGS. 3 and 4, the configuration of the front door 1 formed using the door structure of the present embodiment is the same as that of the first embodiment described above except for the configuration of the communication member 20. Yes. In addition, since structures other than the communication member 20 are the same structures as 1st embodiment mentioned above, description is abbreviate | omitted.

The communication member 20 makes the speaker arrangement space 22 and the door space 14 communicate with each other.
In the present embodiment, the position at which the communication member 20 is disposed is the front of the speaker unit 6 in the front-rear direction of the vehicle.
The first opening 24 a is opened to the speaker arrangement space 22.
The second opening 24b is opened in the door space 14 so as to face a position where the rigidity in the out-of-plane direction is lower than the part of the inner panel 4 where the parts other than the speaker unit 6 and the speaker unit 6 are attached. I'm allowed.

  Specifically, a power window driving motor 28, that is, a component other than the speaker unit 6, is attached to the inner panel 4 behind the speaker unit 6 in the vehicle front-rear direction. In the following description, the case where the component other than the speaker unit 6 is the motor 28 for driving the power window is described. However, the component other than the speaker unit 6 may be, for example, a door opening handle. .

  Here, in order to support the motor 28 for driving the power window, the rigidity in the out-of-plane direction of the inner panel 4 at the position where the motor 28 for driving the power window is attached is higher than that of the other portions. . Further, the position of the inner panel 4 where the power window driving motor 28 is attached has a larger mass per area than the other portions due to the power window driving motor 28.

  On the other hand, since no components other than the speaker unit 6 are attached to the position where the second opening 24b is opposed to the inner panel 4, it is compared with the position where the motor 28 for driving the power window is attached. Thus, the rigidity in the out-of-plane direction is low. Further, the position of the inner panel 4 facing the second opening 24b is lighter in mass per area than the position where the power window driving motor 28 is attached.

As described above, the position of the inner panel 4 facing the second opening 24b is more than the position where the motor 28 for driving the power window is attached, that is, the position where the components other than the speaker unit 6 are attached. Stiffness in the out-of-plane direction is low. Moreover, the motor 28 for driving the power window is not attached at the position where the second opening 24b is opposed, and since the mass per area is light, it is easy to vibrate in the out-of-plane direction.
Other configurations are the same as those of the first embodiment described above.

(Operation)
Next, the operation of the vehicle provided with the front door 1 of the present embodiment will be described. In the following description, since the configuration other than the communication member 20 is the same as that of the first embodiment described above, the operation of different parts will be mainly described.
When sound is output from the front side and the back side of the speaker unit 6 during use of the vehicle-mounted audio, most of the sound output from the front side of the speaker unit 6 is introduced into the vehicle compartment 12 through the trim side opening 26. (See FIG. 4).
On the other hand, the sound output from the back side of the speaker unit 6 is inverted in phase in the speaker arrangement space 22, and the phase inversion sound formed by the inverted sound is radiated to the door space 14 through the communication member 20. Is done. And the phase inversion sound radiated | emitted to the door space 14 vibrates the inner panel 4 with the sound pressure (refer FIG. 4).

At this time, since the second opening 24b is opposed to the inner panel 4, the phase-inverted sound formed in the speaker arrangement space 22 and radiated from the second opening 24b is directly directed to the inner panel 4. Radiated (see FIG. 4).
Further, the position of the inner panel 4 facing the second opening 24b is less rigid in the out-of-plane direction than the position where the power window driving motor 28 is attached, Since the mass is light, it is easy to vibrate out of the plane (see FIG. 4).
Therefore, because the inner panel 4 vibrates efficiently due to resonance between the sound generated from the inner panel 4 and the sound output from the front side of the speaker unit 6, the sound is output from the front side and the rear side of the speaker unit 6. The sound is increased (see FIG. 4).

(Effect of the second embodiment)
(1) In the front door formed using the door structure of the present embodiment, the second opening of the communication member that emits the phase inversion sound is opposed to the inner panel. The phase-inverted sound radiated from the opening is directly radiated to the inner panel.
As a result, the inner panel vibrates more efficiently compared to the first embodiment described above, so that the sound output from the front side and the rear side of the speaker unit is increased, and compared with the first embodiment described above. Thus, it is possible to further improve the sound quality in the low frequency range.

(2) Moreover, in the front door formed using the door structure of this embodiment, the communication member is arrange | positioned ahead of the vehicle front-back direction rather than the speaker unit. Further, the second opening of the communication member is arranged in a direction facing the position where the rigidity in the out-of-plane direction is lower than the portion of the inner panel where the parts other than the speaker unit and the speaker unit are attached in the door space. Opened.
For this reason, the phase reversal sound radiated from the second opening of the communication member is directly radiated to a position in the inner panel where vibration is easier than a portion where components other than the speaker unit are attached. It will be.
As a result, the inner panel vibrates more efficiently compared to the first embodiment described above, so that the sound output from the front side and the rear side of the speaker unit is increased, and compared with the first embodiment described above. Thus, it is possible to further improve the sound quality in the low frequency range.

(Application examples)
(1) In the front door 1 formed using the door structure of the present embodiment, the second opening 24b is formed from the portion of the inner panel 4 where the components other than the speaker unit 6 and the speaker unit 6 are attached. Also, the opening is made in a direction opposite to the position where the rigidity in the out-of-plane direction is low. However, the direction in which the second opening 24b is opened is not limited to this. That is, the second opening 24b is opened in a direction opposite to the position where the rigidity in the out-of-plane direction is higher than the portion of the inner panel 4 where the speaker unit 6 and the parts other than the speaker unit 6 are attached. Also good.

(Third embodiment)
(Constitution)
Next, a third embodiment of the present invention will be described.
FIG. 5 is a diagram showing a configuration concept of the front door 1 of the automobile formed using the door structure of the present embodiment, and is a cross-sectional view of the front door 1 as viewed from above.
As shown in FIG. 5, the configuration of the front door 1 formed using the door structure of the present embodiment includes the connecting member 30 that connects the inner panel 4 and the door trim 10. The configuration is the same as that of the embodiment. In addition, since structures other than the connecting member 30 are the same as those in the first embodiment described above, description thereof is omitted.

The connecting member 30 is disposed in a trim space 32 formed by the inner panel 4 and the door trim 10. Further, the connecting member 30 is constituted by a columnar member extending in the out-of-plane direction of the inner panel 4. In the present embodiment, the material forming the connecting member 30 is, for example, a metal material.
One end 34 a of the connecting member 30 is fixed to a surface of the inner panel 4 that faces the door trim 10. The other end 34 b of the connecting member 30 is fixed to the surface of the door trim 10 that faces the inner panel 4.
Other configurations are the same as those of the first embodiment described above.

(Operation)
Next, the operation of the vehicle provided with the front door 1 of the present embodiment will be described. In the following description, since the configuration other than the connecting member 30 is the same as that of the first embodiment described above, the operation of different parts will be mainly described.
When sound is output from the front side and the back side of the speaker unit 6 during use of the vehicle-mounted audio, most of the sound output from the front side of the speaker unit 6 is introduced into the vehicle compartment 12 through the trim side opening 26. (See FIG. 5).
On the other hand, the sound output from the back side of the speaker unit 6 is inverted in phase in the speaker arrangement space 22, and the phase inversion sound formed by the inverted sound is radiated to the door space 14 through the communication member 20. Is done. And the phase reversal sound radiated | emitted to the door space 14 vibrates the inner panel 4 with the sound pressure (refer FIG. 5).

At this time, since the inner panel 4 and the door trim 10 are connected by the connecting member 30, the vibration of the inner panel 4 excited by the sound pressure of the phase reversal sound is transmitted to the door trim 10 via the connecting member 30. The door trim 10 vibrates (see FIG. 5).
Therefore, in addition to the resonance between the sound generated from the inner panel 4 and the sound output from the front side of the speaker unit 6, the door trim 10 vibrates, so that the sound output from the front side and the back side of the speaker unit 6 increases. Sounded (see FIG. 5).

(Effect of the third embodiment)
(1) In the front door formed using the door structure of the present embodiment, the inner panel and the door trim are connected by the connecting member, and therefore the vibration of the inner panel that is vibrated by the sound pressure of the phase reversal sound is It is transmitted to the door trim via the connecting member.
For this reason, the vibration of the inner panel excited by the sound pressure of the phase reversal sound is effectively transmitted to the door trim, and the door trim vibrates.
As a result, in addition to the resonance between the sound produced by the inner panel and the sound output from the front side of the speaker unit, the door trim vibrates, so the sound output from the front side and the back side of the speaker unit is increased. It is possible to improve the sound quality in the low frequency range.

(Fourth embodiment)
(Constitution)
Next, a fourth embodiment of the present invention will be described.
FIG. 6 is a diagram showing a configuration concept of the front door 1 of the automobile formed using the door structure of the present embodiment, and is a cross-sectional view of the front door 1 as viewed from above. FIG. 7 is a perspective view showing the connecting member 30 of the present embodiment.
As shown in FIGS. 6 and 7, the configuration of the front door 1 formed using the door structure of this embodiment is the same as that of the third embodiment described above except for the configuration of the connecting member 30. Yes. In addition, since structures other than the connecting member 30 are the same as those in the third embodiment described above, description thereof is omitted.

The connecting member 30 is composed of a tubular member that opens in the out-of-plane direction of the inner panel 4 and has two openings. The shape of the connecting member 30 viewed from the out-of-plane direction of the inner panel 4 is a quadrangle.
An edge portion 36a constituting the first opening of the connecting member 30 is fixed to the surface of the inner panel 4 on the vehicle compartment 12 side. An edge portion 36 b constituting the second opening of the connecting member 30 is fixed to a surface of the door trim 10 that faces the inner panel 4.
Other configurations are the same as those of the third embodiment described above.

(Operation)
Next, the operation of the vehicle provided with the front door 1 of the present embodiment will be described. In the following description, since the configuration other than the connecting member 30 is the same as that of the above-described third embodiment, the operation of different parts will be mainly described.
When sound is output from the front side and the back side of the speaker unit 6 during use of the vehicle-mounted audio, most of the sound output from the front side of the speaker unit 6 is introduced into the vehicle compartment 12 through the trim side opening 26. (See FIG. 6).
On the other hand, the sound output from the back side of the speaker unit 6 is inverted in phase in the speaker arrangement space 22, and the phase inversion sound formed by the inverted sound is radiated to the door space 14 through the communication member 20. Is done. And the phase inversion sound radiated | emitted to the door space 14 vibrates the inner panel 4 with the sound pressure (refer FIG. 6).

At this time, since the inner panel 4 and the door trim 10 are connected by the connecting member 30, the vibration of the inner panel 4 excited by the sound pressure of the phase reversal sound is transmitted to the door trim 10 via the connecting member 30. (See FIG. 6).
Moreover, the connection member 30 is comprised from the tubular member which has two opening parts (refer FIG. 7). The edge 36 a constituting the first opening of the connecting member 30 is fixed to the inner panel 4, and the edge 36 b constituting the second opening of the connecting member 30 is fixed to the door trim 10. (See FIG. 6).
Therefore, the vibration of the inner panel 4 transmitted to the door trim 10 via the connecting member 30 is transmitted to a wide range of the door trim 10 via the connecting member 30, so that the vibration of the inner panel 4 is efficient to the door trim 10. (See FIG. 6).

(Effect of the fourth embodiment)
(1) In the front door formed using the door structure of the present embodiment, the connecting member that connects the inner panel and the door trim is constituted by a tubular member having two openings.
Moreover, the edge part which comprises the 1st opening part of a connection member is being fixed to the inner panel, and the edge part which comprises the 2nd opening part of a connection member is being fixed to the door trim.
For this reason, the vibration of the inner panel transmitted to the door trim via the connecting member is transmitted to a wide range of the door trim via the connecting member, and the vibration of the inner panel is efficiently transmitted to the door trim. .

As a result, the energy generated by the vibration of the inner panel is efficiently transmitted to the door trim and the door trim vibrates, so that the sound quality in the low frequency range can be further improved compared to the third embodiment described above. Become.
Here, when the connecting member is constituted by a columnar member as in the third embodiment described above, the door trim is connected even if the connecting member and the door trim are coupled within a narrow range and the entire inner panel vibrates. Only the connecting portion with the member and its periphery vibrate locally. Therefore, it may be difficult to efficiently transmit energy generated by the vibration of the inner panel to the door trim.

As a countermeasure, when the connecting member and the door trim are combined in a wide range by increasing the connecting portion of the connecting member constituted by the columnar member with the door trim, the rigidity of the door trim is low and the connecting member is supported. It can be difficult.
As described above, it is preferable to configure the connecting member from a tubular member having two openings because energy generated by vibration of the inner panel can be efficiently transmitted to the door trim.

(Application examples)
(1) In the front door 1 formed by using the door structure of the present embodiment, the shape of the connecting member 30 viewed from the out-of-plane direction of the inner panel 4 is a quadrangle, but is not limited thereto. Absent. That is, for example, as shown in FIG. 8, the shape of the connecting member 30 viewed from the out-of-plane direction of the inner panel 4 may be a circle. FIG. 8 is a perspective view showing a modified example of the connecting member 30.

It is a figure which shows the structural concept of the front door 1 of the motor vehicle formed using the door structure of 1st embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is a figure which shows the structural concept of the front door 1 of the motor vehicle formed using the door structure of 2nd embodiment of this invention. It is the IV-IV sectional view taken on the line of FIG. It is a figure which shows the structural concept of the front door 1 of the motor vehicle formed using the door structure of 3rd embodiment of this invention. It is a figure which shows the structural concept of the front door 1 of the motor vehicle formed using the door structure of 4th embodiment of this invention. 3 is a perspective view showing a connecting member 30. FIG. FIG. 10 is a perspective view showing a modification of the connecting member 30.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front door 2 Outer panel 4 Inner panel 6 Speaker unit 8 Inner panel vibration means 10 Door trim 12 Car compartment 14 Door space 16 Work opening 18 Partition member 20 Communication member 22 Speaker arrangement space 24 Opening portion of communication member 26 Trim side opening Part 28 Power window driving motor 30 Connecting member 32 Trim space 34 End of connecting member 36 Edge

Claims (3)

An outer panel disposed outside the vehicle, an inner panel disposed closer to the passenger compartment than the outer panel, and a speaker unit disposed in a door space formed between the outer panel and the inner panel with the front side facing the passenger compartment A door structure comprising:
An inner panel exciting means for radiating a phase-reversed sound obtained by inverting the phase of the sound output from the back side of the speaker unit to the door space to vibrate the inner panel ;
The inner panel vibration means includes a partition member that surrounds the back side of the speaker unit to form a speaker arrangement space isolated from the door space, and a communication member that communicates the speaker arrangement space and the door space. With
The communication member includes at least two openings,
A first opening of the opening is opened to the speaker arrangement space, a second opening of the opening is opened to the door space, and is opposed to the inner panel. Door structure. Said second opening, to claim 1, wherein the speaker unit and the rigidity in the plane direction than the portion fitted with parts other than the speaker unit of the inner panel was a low position facing The described door structure. 3. The door structure according to claim 1, further comprising: a door trim disposed on a vehicle compartment side with respect to the inner panel; and a connecting member that connects the inner panel and the door trim.

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