JP2007276568A - Noise control structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise control structure capable of expanding the emitting direction of a control sound. <P>SOLUTION: The noise control structure comprises a sound emission part 20 installed in a range from a seat 10 to a headrest 12 and radiating a control sound to control noise and emitting direction expanding means 14 and 22 to expand the emitting direction of the control sound emitted from the sound emission part 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a noise control structure in a vehicle.

Conventionally, a speaker that is provided in the left and right sides of the headrest and radiates a control sound for controlling vehicle interior noise from the opening surface of the headrest toward the front of the vehicle body, and a residual sound generated by controlling the noise is fed back as an error signal. There has been proposed a noise control device including an error microphone (see, for example, Patent Document 1). However, in such a configuration, there is a possibility that the emission of control sound may be suppressed except in the direction in which the opening surface of the headrest faces.
JP 7-281675 A

  Accordingly, an object of the present invention is to obtain a noise control structure capable of expanding the radiation direction of the control sound in consideration of the above fact.

  In order to achieve the above object, a noise control structure according to claim 1 of the present invention is provided in a range from a seat to a headrest and emits a control sound for controlling noise, and the sound generation And a radiation direction enlarging means for enlarging the radiation direction of the control sound radiated from the unit.

  According to the first aspect of the present invention, the direction in which the control sound is emitted can be expanded. Therefore, a noise control effect can be obtained over a wide range.

  The noise control structure according to claim 2 is the noise control structure according to claim 1, wherein the sounding portion is provided inside the headrest, and the radial direction expanding means is arranged around the surface of the headrest. A plurality of the control sound emission ports are provided at different positions in the direction.

  According to the second aspect of the present invention, since a plurality of radiation openings for radiating control sound are provided on the surface of the headrest at different positions in the circumferential direction, the radiation direction of the control sound can be expanded.

  The noise control structure according to claim 3 is the noise control structure according to claim 1, wherein the sound generation unit is provided in the seat or the headrest, and the radial direction expanding means includes the seat and the headrest. A plurality of intermediate members between the control sound and the control sound emission port are provided.

  According to the third aspect of the present invention, the control sound can be radiated from between the seat and the headrest by expanding the radiation direction.

  According to a fourth aspect of the present invention, there is provided the noise control structure according to the first aspect, wherein the sounding portion is provided on one of the seat and the headrest, and the radial direction expanding means is the A reflection plate that reflects control sound is provided on either the seat or the headrest.

  According to the fourth aspect of the present invention, the control sound can be radiated from the reflector provided on the seat or the headrest by expanding the radiation direction.

  The noise control structure according to claim 5 is the noise control structure according to claim 4, wherein the reflecting surface of the reflector is formed in a concave shape.

  According to the invention described in claim 5, the radiation direction of the control sound can be further expanded.

  The noise control structure according to claim 6 is the noise control structure according to claim 1, wherein the sounding portion is a first sounding portion, and is provided in either the seat or the headrest. The radiating direction expanding means is a second sounding unit that radiates the control sound in a direction opposite to the radiating direction of the control sound radiated from the first sounding unit, and is arranged on one of the seat and the headrest. It is characterized by being provided.

  According to the sixth aspect of the present invention, the first sounding unit that radiates the control sound and the second sounding unit that radiates the control sound are provided with their radial directions facing each other. The emitted control sound becomes an omnidirectional control sound, and the radiation direction can be expanded.

  As described above, according to the present invention, it is possible to provide a noise control structure capable of expanding the radiation direction of the control sound.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below in detail based on the embodiments shown in the drawings. First, the first embodiment will be described. FIG. 1 is a schematic perspective view of a vehicle seat 10 having a noise control structure according to a first embodiment of the present invention. In the drawings, the front of the seat 10 is indicated by an arrow FR, the right side of the seat 10 is indicated by an arrow RH, and the upper side of the seat 10 is indicated by an arrow UP. As shown in FIG. 1, in the first embodiment, a speaker 20 as a sound generation unit is provided inside the headrest 12. That is, two speakers 20 that emit control sound for controlling in-vehicle noise are embedded in the headrest 12 so as to be substantially drum-shaped.

  As shown in FIG. 2A, the speaker 20 is formed in a substantially truncated cone shape, and a plurality of radiation ports 22 are formed at equal intervals in the circumferential direction on the circumferential surface portion 20A having the maximum diameter. Yes. Note that the speaker 20 is closed except for the plurality of radiation ports 22. And this speaker 20 is made into a pair of 2 and is embedded in the headrest 12 with the peripheral surface portion 20A being left and right outside. Therefore, in the vicinity of the left and right peripheral edge portions 12B of the headrest 12, a plurality of radiation ports 14 that are opposed (communication) with the plurality of radiation ports 22 and have a diameter larger than that of the radiation port 22 are equally spaced in the circumferential direction. Is formed.

  The radiation ports 14 and 22 are the radial direction expanding means according to the present invention, and the radiation port forming member 24 shown in FIG. 2B is attached to the radiation port 14 of the headrest 12. FIG. 2A shows a state in which the radiation port forming member 24 is attached to some of the radiation ports 22. The radiation port forming member 24 is formed in a horn shape (substantially a quadrangular pyramid shape) with good radiation efficiency, and a through hole 24A is formed in the center thereof. Then, by inserting the small diameter portion 24B side of the radiation port forming member 24 from the radiation port 14 and fitting the small diameter portion 24B side to the radiation port 22, the circumferential surface portion 20A and the headrest 12 are filled. The radiation port 22 and the radiation port 14 are communicated with each other so that the control sound does not leak between the cushion material 13 and the control sound is radiated to the outside of the headrest 12.

  In addition, this radiation | emission port formation member 24 acts also as a clip (stopper) which can fix the skin 16 of the headrest 12 by being inserted in the radiation port 14 (radiation port 22). An error microphone 26 is attached to at least one of the plurality of radiation openings 14. The error microphone 26 is used to finely adjust the output of the control sound radiated from the speaker 20 by picking up and feeding back the residual sound generated by controlling the noise as an error signal.

  Next, the operation of the noise control structure of the first embodiment as described above will be described. In the first embodiment, the control sound radiated from the radiation port 22 of the speaker 20 is radiated from the radiation port 14 to the outside through the through hole 24 </ b> A of the radiation port forming member 24. Generally, in order to improve the noise control effect by the control sound at the position of the passenger's ear with respect to the in-vehicle noise, the sound generation unit (speaker) and the sound detection means (error microphone) are arranged near the ear position. It is effective. That is, for stable control, it is necessary that the relative position between the sound generation unit (speaker) and the sound detection means (error microphone) and the occupant's ear position is constant and constant.

  Therefore, it is extremely effective to provide the headrest 12 with the radiation port 14 (radiation port forming member 24) that radiates control sound from the speaker 20. In other words, the headrest 12 is usually near the position of the passenger's ears, and even if the seat 10 is moved in the longitudinal direction of the vehicle body and the like, it is integrated with the seat 10, so the radiation port 14 (radiation port forming member 24) The distance to the position does not change. Therefore, the noise control effect is high. In addition, since the opening area of the radiation port 14 (radiation port forming member 24) is the circumferential direction of the headrest 12, the noise control space can be expanded.

  The radiating ports 14 and 22 are not limited to those formed in a single row as shown in the figure in the circumferential direction of the headrest 12, and may be formed in, for example, two rows or a zigzag shape. Good. Further, since the speaker 20 is embedded in the headrest 12, the presence of the speaker 20 is not conspicuous and does not obstruct the seating and leaving of the occupant's seat 10. Furthermore, since the radiation port 14 (radiation port forming member 24) is also provided in the vicinity of the peripheral edge portion 12B of the headrest 12, the head of the occupant does not normally contact. Therefore, it is possible to prevent the occupant from feeling uncomfortable when seated.

  Next, a second embodiment will be described. In addition, the same code | symbol is attached | subjected to the thing equivalent to the said 1st Embodiment, and the detailed description is abbreviate | omitted. FIG. 3 is a schematic front view of the vehicle seat 10 having the noise control structure of the second embodiment according to the present invention. As shown in FIG. 3, in the second embodiment, a speaker 30 as a sound generation unit is provided inside the seat back 11. That is, the speaker 30 is formed in a horn shape (substantially conical shape) with good radiation efficiency, and is provided in the space 18 formed in the seat back 11 so that the radiation port 30A opens upward. The control sound is emitted toward the upper side where the headrest 12 is installed.

  The pair of support members 32 for attaching the headrest 12 to the seat back 11 is formed in a hollow pipe shape having at least a lower end opened, and is formed at the upper end 11A of the seat back 11 to form a space. The pair of two cylindrical portions 28 communicating with the portion 18 are fitted and inserted. The front surface of the support member 32 is formed with a plurality of substantially rectangular emission ports 34 at equal intervals along the axial direction of the support member 32, and the control sound radiated from the speaker 30 is The radiation is emitted from each radiation port 34 through the inside of the support member 32.

  The plurality of radiation openings 34 are radial direction expanding means according to the present invention, and each radiation opening 34 may be formed on the rear surface, the left and right side surfaces, or the like as long as the rigidity of the support member 32 can be secured. In other words, the plurality of radiation ports 34 may be formed at least on the front surface of the support member 32. An error microphone 26 is attached to at least one of the plurality of radiation openings 34 formed in the support member 32.

  Next, the operation of the noise control structure of the second embodiment as described above will be described. In the second embodiment, the control sound radiated from the radiation port 30 </ b> A of the speaker 30 is radiated from the plurality of radiation ports 34 through the inside of the support member 32 of the headrest 12. Therefore, the noise control effect is high. That is, the support member 32 is usually near the occupant's ear position, and even if the seat 10 is moved in the longitudinal direction of the vehicle body and the like, it is integrated with the seat 10, so the distance between the radiation port 34 and the occupant's ear position Does not change. A plurality of radiation openings 34 are formed in the support member 32. Therefore, the control sound can be radiated from the narrow space between the seat back 11 and the headrest 12 by expanding the radiation direction, and the radiation efficiency can be improved.

  Since the speaker 30 is embedded in the seat back 11, the presence of the speaker 30 is not conspicuous, and does not obstruct the seating and leaving of the occupant. Furthermore, since the radiation port 34 is also formed in the support member 32 of the headrest 12, the occupant's head usually does not contact. Therefore, it is possible to prevent the occupant from feeling uncomfortable when seated. In addition, the speaker 30 may be embedded in the headrest 12 instead of the seat back 11 and the control sound may be emitted from the radiation port 34 formed in the support member 32.

  Next, a third embodiment will be described. In addition, the same code | symbol is attached | subjected to the thing equivalent to the said 1st Embodiment and 2nd Embodiment, and the detailed description is abbreviate | omitted. FIG. 4 is a schematic front view and a schematic side sectional view of a vehicle seat 10 having a noise control structure according to a third embodiment of the present invention. As shown in FIG. 4, in the third embodiment, a speaker 30 as a sound generation unit is provided inside the seat back 11.

  That is, the speaker 30 is formed in a horn shape (substantially conical shape) with good radiation efficiency, the radiation port 30A is opened upward, and the distal end portion of the radiation port 30A is the upper end portion 11A of the seat back 11. And embedded in the center of the upper end portion 11A (between the left and right tube portions 28) so as to be substantially flush with each other. The speaker 30 emits a control sound toward the center of the lower end 12A of the headrest 12 (between the left and right support members 32).

  On the other hand, in the center of the lower end portion 12A of the headrest 12 (between the left and right support members 32), a concave portion 36 having a substantially semiconical shape in front view is formed in order to improve radiation efficiency. Inside the headrest 12, a reflector 38 as a radial direction expanding means according to the present invention is embedded at a predetermined angle θ with respect to the horizontal direction in a side view. Note that the range of the predetermined angle θ is preferably 30 degrees ≦ θ ≦ 60 degrees, and more preferably θ = 45 degrees.

  The reflecting plate 38 is formed of a material having high reflectivity, for example, resin or metal, and at least its reflecting surface 38A has a concave shape substantially along the shape of the concave portion 36 and is embedded immediately inside the skin of the headrest 12. ing. Therefore, the control sound radiated from the speaker 30 is reflected by the reflecting surface 38A of the reflecting plate 38, and the radiation direction is expanded and radiated. The error microphone 26 is attached to the support member 32 of the headrest 12 or the like.

  Next, the operation of the noise control structure of the third embodiment as described above will be described. In the third embodiment, a control sound is radiated toward the headrest 12 from the radiation port 30 </ b> A of the speaker 30 embedded in the center of the upper end portion 11 </ b> A of the seat back 11. And the control sound radiated | emitted toward the headrest 12 is reflected by the reflective surface 38A of the reflecting plate 38 inclinedly arranged by the predetermined angle (theta) in the center of 12 A of lower ends of the headrest 12, and is spread | diffused at least toward the vehicle body front Radiated. Therefore, the radiation direction can be expanded, and the noise control effect can be enhanced.

  That is, normally, the headrest 12 is near the passenger's ear position, and even if the seat 10 is moved in the longitudinal direction of the vehicle body and the like, it is integrated with the seat 10, so that the reflector 38 (reflecting surface 38A) and the passenger's ears. The distance to the position does not change. Further, since the reflecting plate 38 has at least a reflecting surface 38A formed in a concave shape substantially along the shape of the concave portion 36, even if the headrest 12 is lowered to the lowest position, the occupant's neck and seat A relatively wide space can be secured between the back 11 and the headrest 12. Therefore, the control sound can be radiated from the narrow space between the seat back 11 and the headrest 12 by expanding the radiation direction, and the radiation efficiency can be improved.

  Since the speaker 30 is embedded in the seat back 11, the presence of the speaker 30 is not conspicuous, and does not obstruct the seating and leaving of the occupant. Further, since the reflecting plate 38 is also embedded inside the recess 36 formed in the headrest 12, its presence is not conspicuous and the head of the occupant is not normally in contact. Therefore, it is possible to prevent the occupant from feeling uncomfortable when seated. Further, the speaker 30 may be embedded in the headrest 12, the concave portion 36 may be formed in the seat back 11, and the reflection plate 38 may be embedded in the same manner as described above.

  Next, a fourth embodiment will be described. In addition, the same code | symbol is attached | subjected to the thing equivalent to the said 1st Embodiment-3rd Embodiment, and the detailed description is abbreviate | omitted. FIG. 5 is a schematic front view of the vehicle seat 10 having the noise control structure of the fourth embodiment according to the present invention. As shown in FIG. 5, in the fourth embodiment, a speaker 30 as a sound generation unit is provided inside the seat back 11.

  That is, the speaker 30 is formed in a horn shape (substantially conical shape) with good radiation efficiency, the radiation port 30A is opened upward, and the distal end portion of the radiation port 30A is the upper end portion 11A of the seat back 11. And embedded in the center of the upper end portion 11A (between the left and right tube portions 28) so as to be substantially flush with each other. The speaker 30 emits a control sound toward the center of the lower end 12A of the headrest 12 (between the left and right support members 32).

  On the other hand, a speaker 40 is also provided inside the headrest 12. That is, the speaker 40 is formed in a horn shape (substantially conical shape) with good radiation efficiency, and the radiation port 40A opens downward, and the front end of the radiation port 40A is connected to the lower end 12A of the headrest 12. It is embedded in the center (between the left and right support members 32) of the lower end portion 12A so as to be substantially flush with the front view. The speaker 40 radiates control sound toward the center of the upper end portion 11A of the seat back 11 (between the left and right tube portions 28). The speaker 40 is the radial direction expanding means according to the present invention, and the error microphone 26 is attached to the support member 32 of the headrest 12 or the like.

  Next, the operation of the noise control structure of the fourth embodiment as described above will be described. In the fourth embodiment, a control sound is radiated from the radiation port 30A of the speaker 30 embedded in the center of the upper end portion 11A of the seat back 11 toward the headrest 12, and at the center of the lower end portion 12A of the headrest 12. A control sound is emitted toward the seat back 11 from the radiation port 40A of the embedded speaker 40.

  In this way, when the control sound is counter-radiated from the vertical direction, the control sounds interfere with each other and lose directivity, so a stable noise control space can be secured over all 360 degrees, The noise control effect can be enhanced. Moreover, the headrest 12 is usually near the occupant's ear position, and even if the seat 10 is moved in the longitudinal direction of the vehicle body, etc., the headrest 12 is integrated with the seat 10, so the distance between the speakers 30 and 40 and the occupant's ear position. Does not change. Therefore, the control sound can be radiated from the narrow space between the seat back 11 and the headrest 12 by expanding the radiation direction, and the radiation efficiency can be improved.

  Since the speakers 30 and 40 are embedded in the seat back 11 and the headrest 12, respectively, the presence of the speakers 30 and 40 is inconspicuous and does not obstruct the seating or leaving of the occupant on the seat 10. Therefore, it is possible to prevent the occupant from feeling uncomfortable when seated. In the fourth embodiment, the speaker 30 is a sounding part (first sounding part) and the speaker 40 is a radial direction expanding means (second sounding part). However, since the speakers 30 and 40 are the same, the speaker 30 is the same. May be the radial direction expanding means (second sounding portion), and the speaker 40 may be the sounding portion (first sounding portion).

  As described above, according to the first to fourth embodiments, the direction in which the control sound is emitted can be expanded. Therefore, a noise control effect can be obtained over a wide range. In particular, when it is desired to emit a control sound from within the range from the seat back 11 to the headrest 12, this structure is effective. In addition, the arrangement | positioning position of the error microphone 26 is not limited to the thing of illustration. That is, the error microphone 26 only needs to be near the position of the occupant's ear, and only needs to be on at least one of the left and right sides.

The schematic perspective view which shows the vehicle seat provided with the noise control structure of 1st Embodiment. (A) Schematic perspective view showing a speaker, (B) Schematic perspective view showing a radiation port forming member. The schematic front view which shows the vehicle seat provided with the noise control structure of 2nd Embodiment. (A) The schematic front view which shows the vehicle seat provided with the noise control structure of 3rd Embodiment, (B) The same schematic sectional side view The schematic front view which shows the vehicle seat provided with the noise control structure of 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seat 11 Seat back 11A Upper end part 12 Headrest 12A Lower end part 12B Peripheral part 13 Cushion material 14 Radiation opening (radiation direction expansion means)
16 Epidermis 18 Space 20 Speaker (Sound generator)
20A peripheral surface part 22 radiation port (radiation direction expanding means)
24 Radiation port forming member 26 Error microphone 28 Tube part 30 Speaker (sounding part / first sounding part)
30A Radiation port 32 Support member (intermediate member)
34 Radiation port
36 Concave part 38 Reflector (radiation direction expanding means)
38A Reflective surface 40 Speaker (radiation direction expanding means / second sounding part)
40A radiation outlet

Claims (6)

A sound generation unit that is provided within a range from the seat to the headrest and emits a control sound for controlling noise,
Radial direction expanding means for expanding the radial direction of the control sound radiated from the sound generation unit;
A noise control structure characterized by comprising:   The sound generating portion is provided inside the headrest, and the radial direction expanding means is a radiation port for the control sound provided at a plurality of positions in the circumferential direction on the surface of the headrest. The noise control structure according to claim 1.   The sound generating portion is provided on the seat or the headrest, and the radial direction expanding means is a plurality of intermediate members between the seat and the headrest, and is a radiation opening for the control sound. The noise control structure according to claim 1, wherein:   The sound generating portion is provided on one of the seat and the headrest, and the radial direction expanding means is a reflecting plate that reflects the control sound, and is provided on either the seat or the headrest. The noise control structure according to claim 1, wherein:   The noise control structure according to claim 4, wherein a reflection surface of the reflection plate is formed in a concave shape.   The sound generation unit is a first sound generation unit, and is provided on one of the seat and the headrest, and the radial direction expansion means faces the radial direction of the control sound emitted from the first sound generation unit. The noise control structure according to claim 1, wherein the second sound generation unit that radiates the control sound is provided on the other of the seat and the headrest.

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