JP6446189B2 - Sound equipment - Google Patents

Description

  The present invention relates to an acoustic device.

  Conventionally, an acoustic device in which a box-shaped speaker is built in a case member of a headrest of a seat is known (for example, see Patent Document 1).

JP 2009-247388 A

However, in the above-described conventional acoustic device, since the box-shaped enclosure of the speaker is incorporated inside the headrest, a large enclosure cannot be used due to the size restriction as the headrest, and the low-frequency sound reproduction capability is low. .
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve a bass reproduction capability with a simple structure in an acoustic device including a speaker on a headrest.

In order to achieve the above object, the present invention includes a sealed core material serving as a core of a headrest main body, an acoustic speaker disposed on the core material, and a hollow headrest stay penetrating the core material. The headrest body has the headrest stay inserted into the backrest portion of the seat and connected to the backrest portion, and the headrest stay communicates the internal space of the core member with the interior of the backrest portion through a hollow portion. The headrest stay includes an air communication hole, and the communication hole that opens in the internal space of the core member is located behind the acoustic speaker and opens above the headrest stay. vinegar Rukoto and features.
Further, according to the present invention, the communication hole that opens in the backrest portion of the communication hole is provided in a pipe-shaped end or side surface of the headrest stay, and the communication hole is provided in the side surface of the pipe shape. The pipe-shaped end in the backrest portion is closed, air flows through the communication hole in the side surface, and the communication hole is not provided in the pipe-shaped side surface, the inside of the backrest portion The end of the pipe shape is not blocked, and air flows through the end .

The present invention also includes an expansion enclosure provided inside the front dress resting portion, the headrest stay is characterized by communicating with the expansion enclosure.
Furthermore, the present invention is characterized in that the expansion enclosure includes a port for releasing air to the front side of the backrest.
Further, the present invention is characterized in that the acoustic speakers are provided as a pair of left and right, and the headrest stay is provided as a pair of left and right at a position close to the acoustic speaker.

  ADVANTAGE OF THE INVENTION According to this invention, the reproduction | regeneration capability of a bass can be improved with a simple structure in the audio equipment which provided the speaker with the headrest.

It is a perspective view showing a headrest device concerning a 1st embodiment of the present invention. It is a perspective view which shows a headrest apparatus. It is the perspective view which decomposed | disassembled the headrest main body. It is a longitudinal cross-sectional view of a headrest apparatus. It is a longitudinal cross-sectional view of a headrest apparatus. It is a cross-sectional view of the headrest device. It is an enlarged view of the peripheral part of the lower cross member in FIG. It is a graph which shows the relationship between the volume of the sound of a headrest apparatus, and the temperature of a control board. It is a front view which shows the upper part of the flame | frame in 2nd Embodiment. FIG. 10 is a Z arrow view of FIG. 9 . It is a figure which shows the structure of the flame | frame in 3rd Embodiment. It is a schematic diagram which shows the structure of the sheet | seat which concerns on 4th Embodiment. It is a figure which shows the internal structure of a sheet | seat.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG.1 and FIG.2 is a perspective view which shows the headrest apparatus 10 which concerns on the 1st Embodiment of this invention. In FIG. 1, illustration of a cushion core member 12 to be described later is omitted. In FIG. 2, illustration of the front surface of the cushion 13 described later is omitted.
The headrest device 10 (acoustic device) is provided on an occupant seat 1 disposed in a vehicle interior. Examples of the vehicle compartment include vehicle compartments such as automobiles, trains, airplanes, and ships. In this embodiment, a headrest device provided on a seat 1 that is a front seat of an automobile and on which a driver sits. 10 will be described as an example. As an automobile, in addition to a normal four-wheeled vehicle, for example, a small electric vehicle not provided with a side door can be cited.
The seat 1 includes a seat surface portion (not shown) on which a driver (seater) sits, a backrest portion 5 that extends upward in a posture slightly tilted rearward from the rear end of the seat surface portion, and the backrest portion 5. And a headrest device 10 attached to the upper end.

  The headrest device 10 includes an acoustic speaker 50 and an acoustic microphone 51, and also includes a communication unit (not illustrated) that enables the headrest device 10 to cooperate with other devices (not illustrated) such as a mobile terminal through short-range wireless communication. As said other apparatus, a mobile telephone, a smart phone, a tablet terminal, a car audio, a car navigation system etc. are mentioned, for example. Examples of the short-range wireless communication include Bluetooth (Near-Range Wireless Communication Standard: registered trademark). The headrest device 10 and the other devices can be connected not only by short-range wireless communication but also by wire, for example.

  In a state in which the headrest device 10 is linked to the other device, the sound speaker 50 outputs sound data of content read from the other device, guidance sound data for guiding the vehicle to the destination, and the like from the acoustic speaker 50. To do. In addition, in the state where the headrest device 10 is linked to the other device, the seated person can operate the other device by using the voice collected by the acoustic microphone 51 as a voice command, or hands-free via the acoustic microphone 51. You can make a call.

  The headrest device 10 covers a frame 11 (frame member) as a skeleton of the headrest device 10, a cushion core material 12 (core material) as a headrest main body connected to the frame 11, and a periphery of the cushion core material 12. And a cushion 13 for receiving the head of the seated person. In the first embodiment, the headrest body is the cushion core material 12, but the headrest body only needs to be covered by the outermost cushion 13, and other members in addition to the cushion core material 12 are used. It may be included.

FIG. 3 is an exploded perspective view of the cushion core member 12 and the frame 11.
The frame 11 is made of metal and is integrally formed by welding a pipe material and a plate material. The frame 11 is made of, for example, a steel material.
The frame 11 includes a pair of headrest stays 15, 15 extending in the vertical direction side by side in the left-right direction, an upper cross member 16 that connects the upper ends of the headrest stays 15, 15 to the left and right, And a lower cross member 17 that connects the headrest stays 15 and 15 to the left and right.

The headrest stays 15 and 15 are formed in a hollow round pipe shape, and include a hollow portion 70 having a substantially circular cross section over the entire length thereof. The headrest stays 15, 15 include stay portions 18, 18 that extend upward substantially parallel to the backrest portion 5, and an internal frame portion 19 that extends upward in a slightly forward tilted posture by bending forward at the upper ends of the stay portions 18, 18. 19.
The inner frame portions 19 and 19 are located inside the headrest device 10 inside the cushion 13. The stay portions 18, 18 are inserted into attachment holes (not shown) formed on the upper surface of the backrest portion 5 and fixed to the seat 1. The headrest device 10 is configured such that the height position of the attachment can be changed according to the physique of the seated person by adjusting the insertion depth of the stay portions 18 and 18 into the attachment hole portion.

The cushion core member 12 is formed in a sealed box shape by combining a substantially box-shaped front case 30 with an open rear surface and a substantially box-shaped rear case 31 with an open front surface at each other opening. Yes. The cushion core material 12 is formed in a substantially rectangular parallelepiped shape that is long in the vertical direction and the left-right direction and short in the front-back direction. The front case 30 and the rear case 31 are resin molded products, and are made of, for example, a resin material such as ABS resin or polypropylene resin.
The front case 30 and the rear case 31 have mating surfaces 32 and 33 at the peripheral edge of the opening, respectively. Specifically, the mating surfaces 32 and 33 are closed by fitting the mating surface 33 of the rear case 31 into the groove 32 a formed on the mating surface 32 of the front case 30. Between the mating surfaces 32 and 33, a frame-like packing (not shown) is interposed to improve the sealing performance. Further, the mating surfaces 32 and 33 may be sealed by joining, for example, by ultrasonic welding.

A plurality of fixing hole portions 20 are provided in front of the upper cross member 16 and the lower cross member 17, and a front case fixing bolt 21 (FIG. 5) for fixing the front case 30 to the frame 11 is fastened to the fixing hole portion 20. Is done. A plurality of fixing hole portions 22 are provided on the rear surfaces of the upper cross member 16 and the lower cross member 17, and a rear case fixing bolt 23 (FIG. 4) that fixes the rear case 31 to the frame 11 is provided in the fixing hole portion 22. Is concluded.
The front case 30 includes a plurality of fixing portions 34 through which the front case fixing bolts 21 are inserted. The rear case 31 includes a plurality of fixing portions 35 through which the rear case fixing bolts 23 are inserted. Specifically, the fixing portions 34 and 35 are formed in a bottomed cylindrical shape that is recessed toward the inside of the cushion core member 12, and the front case fixing bolt 21 and the rear case fixing bolt 23 are inserted into the cylindrical bottom portion. Is done.

The front case 30 and the rear case 31 are arranged such that the frame 11 is sandwiched from the front and the rear and the mating surfaces 32 and 33 are fitted to each other, and the front case fixing bolt 21 and the rear case fixing bolt 23 provided from the outside are used as the frame. 11 is fixed. That is, the upper part of the frame 11 is located inside the cushion core member 12 formed in a hollow shape.
The cushion core material 12 includes stay through holes 36 and 36 in the lower part through which the stay portions 18 and 18 penetrate downward. A seal member (not shown) is provided between the stay through-holes 36 and 36 and the stay portions 18 and 18, and the inside of the cushion core material 12 is secured.

FIG. 4 is a longitudinal sectional view of the headrest device 10. FIG. 5 is a longitudinal sectional view of the headrest device 10. FIG. 6 is a cross-sectional view of the headrest device 10. Here, in FIG.4 and FIG.6, the cross section of the position which passes the acoustic speaker 50 is shown. In FIG. 5, the cross section of the center of the width direction of the headrest apparatus 10 is shown.
3 to 6, the front case 30 includes a partition plate portion 37 that extends substantially horizontally toward the rear case 31 at the lower portion inside. The rear case 31 includes an engagement portion 38 into which the rear end of the partition plate portion 37 is fitted at the lower portion inside.

The space inside the cushion core member 12 is partitioned by a partition plate portion 37 into a lower storage portion 39 and an enclosure portion 40 above the storage portion 39. The enclosure part 40 has a larger internal space 40 a than the storage part 39.
The cushion core 12 includes a front surface 12a facing the back head H of the seated person, a rear surface 12b, a top surface 12c, a lower surface 12d, a right side surface 12e, and a left side surface 12f.

The cushion core member 12 is provided with a pair of left and right acoustic speakers 50, 50, an acoustic microphone 51, and a subwoofer 52. Specifically, the acoustic speakers 50 and 50, the acoustic microphone 51, and the subwoofer 52 are attached to the acoustic device attachment surface 41 that is the front surface of the enclosure unit 40 on the front surface 12 a.
Further, inside the cushion core member 12, a control board 53 (a heating element) and a secondary battery 54 for supplying power to the control board 53 are housed. The control board 53, and acoustic signal processing circuit for operating the acoustic speaker 50 and the subwoofer 52 and conversion processing an audio signal sent from the outside into the audio signal for digital speaker, control for controlling the acoustic microphone 51 Circuits are installed. The control board 53 has an amplifier function.

The left side surface 12f of the cushion core member 12 is provided with an interface portion 55 in which connection terminals, a power switch, and the like from the outside to the control board 53 and the secondary battery 54 are disposed.
The headrest device 10 includes a secondary battery 54 and is detachably provided separately from the backrest 5 and can operate independently.

Each acoustic speaker 50 includes an ellipse (substantially racetrack-like) diaphragm 57 that is longer in the vertical direction than the left-right direction, and a drive unit (not shown) that includes a voice coil and a magnet to drive the diaphragm 57. Is provided.
As shown in FIGS. 2 and 6, the acoustic device mounting surface 41 is an impact-resistant surface that receives the occipital head H of the seated person, and is a receiving surface portion that is formed substantially flat in plan view at the center in the width direction of the headrest device 10. 58 and speaker support holes 59 and 59 communicating with the inside of the enclosure part 40 on the left and right sides of the receiving surface part 58. The acoustic speakers 50 and 50 are fixed so as to be fitted into the speaker support holes 59 and 59.

As shown in FIG. 6, the acoustic speakers 50, 50 are arranged on the left and right edges of the acoustic equipment mounting surface 41 so as to be positioned on the left and right sides of the occipital head H, and the longitudinal direction thereof is directed in the vertical direction. To be arranged. Further, the acoustic speakers 50, 50 are disposed with the diaphragm 57 facing forward so that the sound S1 can be output substantially horizontally, and the sound S1 that is output is directed outward so that the front side of the sound S1 spreads outward on the left and right. It is inclined and arranged.
Thus, since the headrest device 10 is provided with the vertically elongated acoustic speakers 50, 50, the lateral width of the headrest device 10 can be reduced while maintaining the overall size of the diaphragm 57. For this reason, while being able to ensure sound quality, when a seated person confirms back, the headrest apparatus 10 does not become obstructive and the visibility of back is good. In addition, the headrest device 10 has high versatility and can be applied to various types of vehicles because the lateral width does not increase even if the headrest device 10 includes the acoustic speakers 50 and 50.

Since the acoustic speakers 50 and 50 are elongated vertically, as shown in FIGS. 4 and 6, the sound S1 of the acoustic speakers 50 and 50 is output in a narrow range in the left-right direction and wide in the vertical direction. Is output. That is, the directivity of the sound S1 of the acoustic speakers 50, 50 is narrow in the left-right direction and wider in the up-down direction than in the left-right direction.
As a result, the voice S1 can be output in a wide range in the vertical direction, and the sound quality is always provided to the seated person without being affected by the height position of the head of the seated person or the vertical adjustment position of the headrest device 10. it can. In addition, since the voice S1 hardly spreads in the left-right direction, a personal acoustic space can be provided to the seated person, and the sound output from the headrest device 10 can be prevented from reaching the seat side adjacent to the seated person.

  Further, since the sound speakers 50 and 50 are arranged so as to be inclined outward so that the output sound S1 spreads outward in the left and right directions toward the front side, the left and right intervals between the sound speakers 50 and 50 are reduced. Even if the headrest device 10 is downsized, the sound can be spread left and right so that the sound reaches the ears of the seated person, and the seated person can feel a good stereo feeling.

  Moreover, in this Embodiment, the acoustic speaker 50,50 is supported by the cushion core material 12, and the enclosure part 40 of the sealed hollow cushion core material 12 is used as an enclosure which reinforces a low sound. For this reason, it is not necessary to provide a dedicated enclosure, and the structure can be simplified. Further, since the cushion core material 12 having a relatively large internal space 40a is used as an enclosure, the sound quality is good.

  As shown in FIGS. 3 and 5, the acoustic device mounting surface 41 includes a woofer mounting surface 60 to which the subwoofer 52 is mounted at the lower portion. Specifically, the woofer mounting surface 60 is provided at the center in the width direction of the cushion core member 12 below the speaker support holes 59, 59, and is inclined so as to face the front lower side. The subwoofer 52 is attached to the woofer attachment surface 60 so that the subwoofer 52 faces front and lower and outputs the sound S2 to front and lower. The diaphragm of the subwoofer 52 is driven by a drive unit (not shown) controlled by the control board 53. In this way, by providing the subwoofer 52 downward, it is possible to transmit sound to the lower part of the seated person's body and to make it easier for the seated person to feel the bass.

  As shown in FIGS. 2, 3, and 5, the receiving surface portion 58 of the acoustic device mounting surface 41 includes a sound collecting portion 61 that is recessed toward the inside of the enclosure portion 40. The sound collection unit 61 is disposed in the center in the width direction of the headrest device 10 between the acoustic speakers 50, 50, and is disposed in the center in the vertical direction of the headrest device 10 above the subwoofer 52. Located behind. The sound collecting portion 61 is formed in a substantially conical shape that tapers toward the rear end side, and a substantially conical axis (not shown) of the sound collecting portion 61 extends substantially horizontally forward. A sound collection opening 61 a that takes sound into the sound collection unit 61 is formed on the front surface of the sound collection unit 61. Note that the sound collection unit 61 may have any shape that can collect sound, and is not limited to a substantially conical shape. The sound collection unit 61 may have a substantially pyramid shape or a substantially truncated cone shape, for example.

The acoustic microphone 51 is arranged in the center of the sound collection unit 61 so that the acoustic microphone 51 can collect sound efficiently.
In the present embodiment, since the acoustic microphone 51 is disposed between the acoustic speakers 50 and 50 and the acoustic speakers 50 and 50 are disposed outward, the sound S1 of the acoustic speakers 50 and 50 is directly received by the acoustic microphone 51. Sound can be prevented, and the acoustic microphone 51 can be prevented from being affected by the sound S1.
Further, since the subwoofer 52 outputs the voice S2 forward and downward below the acoustic microphone 51, the voice S2 can be prevented from being directly received by the acoustic microphone 51, and the acoustic microphone 51 affects the voice S2. Can be prevented. Further, since the subwoofer 52 outputs the sound S2 from the rear side of the back head H to the front lower side, the sound S2 is transmitted to the seated person mainly through the trunk part of the seated person having a larger volume than the head. . For this reason, a seated person can be made to feel a low sound easily and a powerful low sound can be provided.

Moreover, the subwoofer 52 is supported by the enclosure part 40 of the sealed hollow cushion core material 12 similarly to the acoustic speakers 50, 50, and uses the enclosure part 40 as an enclosure that enhances bass. For this reason, it is not necessary to provide a dedicated enclosure, and the structure can be simplified. Further, since the cushion core material 12 having a relatively large internal space 40a is used as an enclosure, the sound quality is good.
That is, the acoustic speakers 50 and 50 and the subwoofer 52 share the enclosure portion 40 of the cushion core material 12 as an enclosure. Here, when the acoustic speakers 50 and 50 and the subwoofer 52 are provided in the same enclosure unit 40, it may be considered that the sound quality is affected by mutual interference, but the headrest device 10 is close to the head. Since the sound output is relatively small, the influence of the interference is small.

  Further, the fixing portion 34 (FIG. 2) through which the front case fixing bolt 21 is inserted is between the acoustic speakers 50 and 50 above the acoustic microphone 51 and on the left and right sides of the subwoofer 52 below the acoustic speakers 50 and 50. It is provided for each. For this reason, the front case 30 can be fixed by the fixing portion 34 provided at a position where the front case 30 can be firmly fixed while the acoustic speakers 50, 50, the acoustic microphone 51, and the subwoofer 52 are arranged in a well-balanced manner. 12 sealing properties can be secured.

As shown in FIGS. 4 to 6, the cushion 13 includes a front cushion portion 62 that covers the front surface 12 a of the cushion core member 12, and a rear cushion portion 63 that covers the remaining surface of the cushion core member 12.
The rear side cushion part 63 covers the rear surface 12b, the right side surface 12e, the left side surface 12f, the rear surface of the lower surface 12d, and the rear surface of the top surface 12c, which are the remaining surfaces. The front cushion portion 62 covers the entire front surface 12a, the front portion of the lower surface 12d, and the front portion of the top surface 12c. The front cushion portion 62 and the rear cushion portion 63 are joined together at the edges to form a bag shape, and are attached to the cushion core 12 so as to be covered.

The rear cushion 63 includes two layers, an attenuation layer 63a made of a material that attenuates sound with high efficiency, and a sound insulation layer 63b made of a material with high sound insulation.
The attenuation layer 63a is made of, for example, a resin having high sound absorption performance such as urethane and having high cushioning properties. As the urethane, for example, a high sound-absorbing property can be obtained by using an open-cell body having a porous structure.

The sound insulation layer 63b is made of a soft resin material that can be sewn and has high vibration (sound) attenuation and sound insulation. The sound insulation layer 63b is made of, for example, an elastomer, and as an example, is made of an olefin-based thermoplastic elastomer.
The attenuation layer 63a is an inner layer that is in close contact with the rear surface 12b of the cushion core member 12, and the sound insulation layer 63b is an outer layer that is exposed to the outside. The outer surface of the attenuation layer 63a and the inner surface of the sound insulation layer 63b are in close contact with each other, and the attenuation layer 63a and the sound insulation layer 63b are integrated. The attenuation layer 63a is formed thicker than the sound insulation layer 63b.
That is, the rear side cushion part 63 is made of a material that can provide cushioning as a headrest and that can efficiently attenuate and insulate sound.

The front cushion 62 is a so-called fiber pad, which is a three-dimensional mesh cushion formed by knitting a fibrous body into a three-dimensional mesh. Examples of the fiber body include a polypropylene fiber body and a mixed fiber body of polypropylene and polyethylene terephthalate. In detail, the front cushion part 62 is provided with the front cushion part main body 62a which consists of the said three-dimensional net-like cushion body, and the front pad part 62b which covers the surface of the front cushion part main body 62a. The front pad portion 62b is constituted by a three-dimensional mesh cushion body having a mesh that is coarser than that of the front cushion portion main body 62a.
The front cushion portion 62 has high cushioning properties and high sound permeability and breathability due to the three-dimensional network structure. That is, the front cushion part 62 is made of a material having cushioning properties as a headrest and capable of passing sound efficiently.

  The sounds S1 and S2 output forward from the acoustic speakers 50 and 50 and the subwoofer 52 are output forward through the front cushion portion 62 having high sound permeability. On the other hand, the sound output rearward from the acoustic speakers 50 and 50 and the subwoofer 52 is attenuated and blocked in the headrest device 10 by the rear side cushion portion 63, and is hardly output outside the rear. Specifically, the sound output backward from the acoustic speakers 50 and 50 and the subwoofer 52 is first attenuated and attenuated by the attenuation layer 63a, and then attenuated and sound-insulated by the sound insulation layer 63b. The sound to be output can be effectively insulated. Thereby, while being able to supply a sound forward through the front cushion part 62 with high sound permeability, the sound leaking backward can be reduced by the rear cushion part 63, a personal acoustic space can be provided to the seated person.

  Further, the front cushion part 62 is made of a material having a good sound transmission property over the entire surface, and the front cushion part 62 has an effect on the sound as compared with a structure in which a sound passage hole is provided in a part of the cushion. Can be reduced. For this reason, the sound quality of the headrest device 10 is good. Moreover, in the structure provided with the above-described sound hole, the sound hole may be blocked by the head, and in this case, the sound quality is deteriorated. On the other hand, in the present embodiment, the substantially front surface of the front cushion portion 62 is made of a material with good sound transmission, and the entire front cushion portion 62 is not blocked by the head. Good sound quality is obtained. Here, the portion formed of the material having good sound transmission in the front cushion portion 62 may be provided over a region wider than the region of the projection portion in which the head is projected on the front cushion portion 62 side in the front view. desirable. That is, it is desirable that the portion of the front cushion portion 62 made of a material with good sound transmission is provided up to a range that is not hidden by the head when viewed from the front with the head in contact with the headrest device 10.

Next, a configuration for further enhancing the bass reproduction capability of the sound output from the headrest device 10 will be described.
As shown in FIGS. 1, 3, and 6, the headrest stays 15, 15 are formed in a hollow pipe shape over the entire length, and a hollow portion 70 that penetrates the headrest stays 15, 15 in the axial direction. Respectively. The hollow portion 70 includes an upper opening 71 (communication hole) that opens in the enclosure portion 40 and a lower opening 72 (communication hole) that opens outside the cushion core member 12. The lower opening 72 opens inside the backrest 5.
In the present embodiment, the upper opening 71 is located at the upper ends of the headrest stays 15 and 15, and the lower opening 72 is located at the lower ends of the headrest stays 15 and 15.
That is, the internal space 40 a of the enclosure part 40 and the space outside the enclosure part 40 communicate with each other via the hollow part 70 of the headrest stays 15 and 15.

  When the acoustic speakers 50 and 50 and the subwoofer 52 are driven, the air A in the enclosure part 40 is pushed out by the vibration of the acoustic speakers 50 and 50 and the subwoofer 52. Specifically, as shown in FIG. 1, the air A enters the hollow portion 70 from the upper opening 71 of the headrest stays 15, 15, and flows outward from the lower opening 72 through the hollow portion 70. For this reason, the headrest stays 15 and 15 can be used as so-called bass reflex ducts, and the low-frequency reproduction capability of the acoustic speakers 50 and 50 and the subwoofer 52 can be enhanced without providing a dedicated duct.

  Note that the positions of the upper opening 71 and the lower opening 72 are not limited to the upper and lower ends of the headrest stays 15 and 15 and may be provided at positions where excellent acoustic characteristics can be obtained. The positions and sizes of the upper opening 71 and the lower opening 72 are set so that excellent acoustic characteristics can be obtained in consideration of the volume of the enclosure part 40, the size and capacity of the acoustic speakers 50, 50, and the like. For example, instead of the upper opening 71 and the lower opening 72, an upper opening and a lower opening that are provided on the side surfaces of the headrest stays 15 and 15 and communicate with the hollow portion 70 can be provided, respectively. You may adjust the distance between an upper opening and a lower opening so that it may be obtained. Further, according to the required acoustic characteristics, only one headrest stay 15 may be used as a bass reflex duct by providing the upper opening 71 and the lower opening 72 on only one of the headrest stays 15 and 15.

The upper openings 71 and 71 are disposed at positions overlapping the acoustic speakers 50 and 50 when viewed from the front, and are located behind the acoustic speakers 50 and 50 , respectively. For this reason, the air flow resulting from the driving of the left and right acoustic speakers 50, 50 can be flowed through the left and right upper openings 71, 71 into the hollow portions 70, 70 in a well-balanced manner, and the bass can be enhanced with a good balance between the left and right sides. .

Next, a configuration for efficiently cooling the control board 53 will be described.
FIG. 7 is an enlarged view of the periphery of the lower cross member 17 in FIG.
Referring to FIGS. 3, 5, and 7, the lower cross member 17 is formed in a rod shape that connects the headrest stays 15, 15 to the left and right. The lower cross member 17 is formed by bending a plate material into a substantially L shape, and in a cross-sectional view perpendicular to the longitudinal direction, the lower cross member 17 extends substantially horizontally and from above one end of the horizontal plate portion 85. And a vertical plate portion 86 extending in the vertical direction.
The vertical plate portion 86 is inclined toward the other end side of the horizontal plate portion 85 with respect to the vertical direction, and the angle formed by the horizontal plate portion 85 and the vertical plate portion 86 is smaller than 90 °.

The horizontal plate portion 85 has a fixed plate portion 87 extending upward from the other end at both ends in the longitudinal direction, and the fixed hole portion 22 is formed in the fixed plate portion 87. Further, the horizontal plate portion 85 has a cutout portion 85 a formed by cutting the horizontal plate portion 85 from the other end side between the fixed plate portions 87 and 87.
The vertical plate portion 86 includes the fixed hole portions 20 at both ends in the longitudinal direction. The vertical plate portion 86 includes an outer surface 86a facing the front surface side of the headrest device 10 and an inner surface 86b on the back side of the outer surface 86a.
The lower cross member 17 is welded to the headrest stays 15 and 15 at both ends in the longitudinal direction via the other end of the horizontal plate portion 85 and the upper end of the vertical plate portion 86.

The control board 53 includes an LSI 53a that is an integrated circuit and a board 53b that supports the LSI 53a. The control board 53 is provided between the fixed holes 20 and 20 on the inner side surface 86b.
The control board 53 is attached to the inner side surface 86b via a heat conducting member 88 provided between the inner side surface 86b of the lower cross member 17 and the LSI 53a. As the heat conduction member 88, a sheet-like member made of a material having high heat conductivity or heat radiation grease can be used.

The heat of the control board 53 is transmitted to the lower cross member 17 through the heat conducting member 88, and further transmitted from the lower cross member 17 to the headrest stays 15 and 15 and the upper cross member 16, and from the entire frame 11 into the air. Heat is dissipated. That is, since the frame 11 made of metal and having high heat dissipation is used as the heat dissipation member of the control board 53, the heat of the control board 53 can be efficiently radiated with a simple configuration without adding a dedicated heat sink or the like. In particular, the headrest stays 15 and 15 can effectively dissipate heat because their lower portions extend outside the enclosure portion 40. Moreover, since a dedicated heat sink or the like is not added, a large volume of the internal space 40a of the enclosure part 40 can be ensured, and a low sound reproduction capability is good.
In the first embodiment, the control board 53 is provided inside the enclosure unit 40. However, when the control board 53 is provided inside the cushion 13 in a configuration without the enclosure unit 40, the control board 53 is provided. If 53 is provided in contact with the frame 11, the control board 53 can be efficiently radiated by heat conduction through the frame 11.

Further, the air A (FIG. 1) in the internal space 40 a of the enclosure part 40 passes through the hollow part 70 of the headrest stays 15, 15 and is discharged from the lower opening 72 to the outside. For this reason, the air heated by the heat radiation of the control board 53 can be discharged to the outside through the hollow portion 70, and the heat of the control board 53 can be efficiently radiated with a simple configuration.
Further, since the heat conducting member 88 is brought into contact with the LSI 53a, the heat of the LSI 53a can be efficiently transmitted to the lower cross member 17.
Furthermore, when the seated person leans against the backrest part 5, the cushion of the backrest part 5 is deformed, and a part of the air flow generated thereby flows from the lower opening 72 to the hollow part 70 and flows into the internal space 40a. Then, the control board 53 is cooled. For this reason, the control board 53 can be efficiently cooled using the airflow generated by the movement of the seated person.

FIG. 8 is a chart showing the relationship between the sound volume of the headrest device 10 and the temperature of the control board 53. In FIG. 8, a result R1 when the control board 53 is attached to the inner side surface 86b via the heat conducting member 88 and a result R2 when the control board 53 is provided in the internal space 40a without contacting the frame 11 are shown. It is shown.
As shown in FIG. 8, as the sound volume increases, the current required by the acoustic speakers 50, 50, etc. increases, so the temperature of the control board 53 increases as the volume increases.
In the present embodiment, by attaching the control board 53 to the lower cross member 17, the temperature is lowered by about 20 ° C. regardless of the size of the volume as compared with the case where the control board 53 is not in contact with the frame 11. I was able to.
Further, as the volume increases, the vibration of the acoustic speakers 50, 50, etc. increases, and the flow rate of the air A discharged through the hollow portion 70 also increases. In other words, in the present embodiment, as the sound volume increases, the flow rate of the air A naturally increases and the ability to dissipate the heat of the control board 53 increases. For this reason, the heat of the control board 53 can be efficiently radiated.

  As described above, according to the first embodiment to which the present invention is applied, the headrest device 10 includes the cushion core material 12 having a sealed structure, the acoustic speakers 50 and 50 disposed on the cushion core material 12, The headrest stays 15 and 15 have hollow headrest stays 15 and 15 penetrating the cushion core material 12, and the headrest stays 15 and 15 distribute the air inside the cushion core material 12 to the outside via the hollow portion 70. As a result, the headrest stays 15 and 15 can be used as ducts for improving the bass reproduction capability, and the bass reproduction capability can be improved with a simple structure.

Moreover, since the headrest stays 15 and 15 are provided with upper openings 71 and 71 and lower openings 72 and 72 that are air communication holes at the upper and lower ends of the pipe shape, the upper openings 71 and 71 and the lower openings are arranged in accordance with required characteristics. The acoustic characteristics can be optimized with a simple configuration by setting the positions of the openings 72 and 72.
The acoustic speakers 50 and 50 are provided as a pair of left and right, and the headrest stays 15 and 15 are provided as a pair of left and right at positions close to the acoustic speakers 50 and 50. For this reason, the low-pitched sound reproduction ability of the left and right acoustic speakers 50, 50 can be improved in a well-balanced manner.
Furthermore, since the lower openings 72 and 72 are opened in the backrest part 5 away from the seated person's ear, it is possible to suppress the sound of the airflow emitted from the lower openings 72 and 72 from being heard by the seated person. For this reason, noise can be reduced and sound quality can be improved.

  Further, according to the first embodiment to which the present invention is applied, the headrest device 10 includes the metal frame 11 provided inside the headrest device 10, and the frame 11 is connected to the backrest portion 5 of the seat 1. The headrest stays 15 and 15 are integrally provided, and a control board 53 as a heating element is fixed to the frame 11. For this reason, the heat of the control board 53 can be efficiently radiated to the outside through the metal frame 11 including the headrest stays 15 and 15.

Further, the headrest stays 15 and 15 are configured to be hollow, and the air inside the headrest device 10 is circulated to the outside via the hollow portions 70 and 70, so that the air A flowing from the hollow portions 70 and 70 to the outside is used. The heat of the control board 53 can be efficiently radiated to the outside.
Furthermore, the frame 11 is provided inside the cushion core material 12 having a sealed structure and supports the cushion core material 12, and the headrest stays 15 and 15 communicate the inner space 40 a inside the cushion core material 12 to the outside. For this reason, the air in the inner space 40a inside the cushion core member 12 having the sealed structure can be circulated from the hollow portions 70 and 70 to the outside, and the heat of the control board 53 can be efficiently radiated to the outside.

In addition, since the acoustic speaker 50, 50 is provided on the cushion core member 12, sound can be output from the headrest device 10, and air A of the hollow portions 70, 70 can be generated by the air flow generated by the output of the acoustic speaker 50, 50. Can be promoted. For this reason, the heat of the control board 53 can be efficiently radiated to the outside.
Further, since the control board 53 is an acoustic signal processing circuit for the acoustic speakers 50, 50, the heat A of the acoustic signal processing circuit can be efficiently radiated by the air A flowing from the hollow portions 70, 70 to the outside.
Further, the headrest stays 15, 15 communicate the inner space 40 a of the cushion core member 12 with the interior of the backrest 5, so that the hollow portions 70, 70 are formed by the flow of air in the backrest 5 due to deformation of the backrest 5. Air circulation can be promoted. For this reason, the heat of the control board 53 can be efficiently radiated to the outside.

[Second Embodiment]
Hereinafter, a second embodiment to which the present invention is applied will be described with reference to FIGS. 9 and 10. In the second embodiment, parts that are configured in the same manner as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
In the first embodiment, the control board 53 is described as being provided on the lower cross member 17. However, in the second embodiment, the control board 53 is provided on the frame 311 having no lower cross member 17. This is different from the first embodiment.

FIG. 9 is a front view showing the upper part of the frame 311 in the second embodiment.
The upper part of the frame 311 (frame member) is located inside the cushion core material 12, and the cushion core material 12 is supported by the frame 311.
The frame 311 is formed by bending a hollow metal pipe into a substantially U shape, and connects the pair of headrest stay portions 315 and 315 (headrest stay) extending substantially vertically and the headrest stay portions 315 and 315. And a substantially semicircular arc-shaped bent portion 316. The frame 311 includes a hollow portion 370 extending over the entire length thereof.
The headrest stay portions 315 and 315 include a lower opening (communication hole) (not shown) that allows the hollow portion 370 to communicate with the outside at the lower end portion. Moreover, the headrest stay parts 315 and 315 are provided with an upper opening 371 (communication hole) that allows the hollow part 370 to communicate with the outside. The upper opening 371 opens into the internal space 40a.

The headrest stay portions 315 and 315 have small-diameter portions 317 and 317 having outer diameters smaller than those of the surrounding headrest stay portions 315 and 315. The inner diameters of the hollow portions 317a and 317a of the small diameter portions 317 and 317 are smaller than the inner diameter of the hollow portion 370 of the surrounding headrest stay portions 315 and 315. That is, the cross-sectional area of the hollow portions 317a and 317a is smaller than the cross-sectional area of the surrounding hollow portion 370. For this reason, the flow velocity of the air flowing through the hollow portions 317a and 317a is larger than the flow velocity of the air flowing through the surrounding hollow portion 370.
The control board 53 is provided across the left and right headrest stay portions 315 and 315. Specifically, the control board 53 is attached to the small diameter portions 317 and 317 at both ends in the longitudinal direction.

Figure 10 is a Z arrow view of FIG.
The control board 53 is attached to the small diameter portions 317 and 317 via a heat conducting member 88 provided between the outer peripheral surfaces of the small diameter portions 317 and 317 and the LSI 53a.
In the second embodiment, in the headrest stay portions 315 and 315, the small-diameter portions 317 and 317, which are portions in the vicinity of the control board 53, are formed so that the cross-sectional areas of the hollow portions 317a and 317a are smaller than the surroundings. The flow velocity of the air flowing through the hollow portions 317a and 317a in the vicinity of the control board 53 can be increased. For this reason, the heat of the control board 53 can be efficiently radiated to the outside.
Moreover, since the control board 53 is arrange | positioned in the small diameter parts 317 and 317 dented inside, the control board 53 can be arrange | positioned compactly.
Furthermore, since the headrest stay portions 315 and 315 are used as bass reflex ducts, bass can be enhanced.

Note that the headrest stay portions 315 and 315 may have substantially the same diameter over the entire length without providing the headrest stay portions 315 and 315 with the small diameter portions 317 and 317. In this case, the control board 53 is attached to the outer peripheral portions of the headrest stay portions 315 and 315 via the heat conducting member 88.
Further, a small-diameter portion smaller than the outer diameter of the surrounding headrest stays 15 and 15 is provided in the middle of the headrest stays 15 and 15 of the first embodiment, and the cross-sectional area of the hollow portion of the small-diameter portion is reduced. Also good. In this case, by providing the small diameter portion in the vicinity of both end portions of the control board 53, the flow velocity of the hollow portion in the vicinity of the control board 53 can be increased, and the heat dissipation efficiency can be improved.
In the second embodiment, the headrest stay portions 315 and 315 have been described as having small-diameter portions 317 and 317 that have outer diameters smaller than those of the surrounding headrest stay portions 315 and 315. However, the present invention is not limited to this. For example, instead of the small-diameter portions 317 and 317, the headrest stay portions 315 and 315 may be recessed by pressing or the like to provide a planar portion, and the control board 53 may be disposed on the planar portion. In other words, the planar portion has a semi-cylindrical shape in a cross-sectional view, and the contact area between the headrest stay portions 315 and 315 and the control substrate 53 is increased by attaching the control substrate 53 to the semi-cylindrical flat plate-like portion. The heat of the control board 53 can be efficiently transmitted to the headrest stay portions 315 and 315.

[Third Embodiment]
A third embodiment to which the present invention is applied will be described below with reference to FIG. In the third embodiment, parts that are configured in the same manner as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
In the third embodiment, air communication holes are provided at positions different from those of the first embodiment.

FIG. 11 is a diagram illustrating a configuration of the frame 111 according to the third embodiment.
The headrest device 110 includes a frame 111 instead of the frame 11.
The frame 111 includes headrest stays 115 and 115 that are inserted into attachment holes (not shown) formed on the upper surface of the backrest portion 5, and upper end portions of the headrest stays 115 and 115 inside the enclosure portion 40 (FIG. 4). And a cross member 117 connected to the left and right.

Each headrest stay 115, 115 includes a hollow pipe-like stay main body 175, a hollow extension pipe portion 176 connected to the upper end of the stay main body 175, and a lid member 177 that closes the lower end of the stay main body 175. The stay main body 175 and the cross member 117 are made of metal. The extension pipe portion 176 and the lid member 177 are made of resin that is lighter than the material of the stay body 175.
The cross member 117 is provided on the extension pipe portion 176. The stay main body 175 and the extension pipe portion 176 are connected and integrated, and have a hollow portion 170 extending over the entire length thereof. The extension pipe part 176 includes an upper opening 171 (communication hole) that opens in the enclosure part 40 at the upper end. That is, by adding the extension pipe portion 176 to the stay main body 175, the opening positions of the headrest stays 115 and 115 are moved upward. Moreover, since the extension pipe part 176 is resinous and lightweight, the position of the upper opening 171 can be adjusted without greatly increasing the weight.

An opening 175 a at the lower end of the stay main body 175 is closed by a lid member 177. The stay main body 175 includes a side surface opening 172 (communication hole) communicating with the hollow portion 170 on the side surface above the opening 175a. The side opening 172 opens inside the backrest 5. That is, the opening 175a at the lower end of the stay main body 175 is closed with the lid member 177 and the side opening 172 is provided above the opening 175a, whereby the position of the opening on the lower end side of the hollow portion 170 is moved upward. Since the lid member 177 is resinous and lightweight, the weights of the headrest stays 115 and 115 are not greatly increased.
As described above, by adding the extension pipe portion 176 and the lid member 177 to the stay main body 175, the upper opening 171 and the side opening 172 can be provided at arbitrary positions having excellent acoustic characteristics. In addition, the extension pipe part 176 and the cover member 177 do not need to be used simultaneously, but can be used independently according to a required acoustic characteristic.
In the third embodiment, the upper opening 171 and the side opening 172 are described as examples of the communication holes. However, the communication holes are not limited to this, and the communication holes are formed on the inside of the enclosure part 40 and the outside of the enclosure part 40. It is sufficient that at least one pair is provided, and the position of the communication hole is set at an arbitrary position depending on the acoustic characteristics, the restriction of the arrangement space, and the like. That is, a pair of communication holes may be provided on the side surfaces of the headrest stays 115 and 115, or may be provided on the ends and side surfaces of the headrest stays 115 and 115.

[Fourth Embodiment]
Hereinafter, a fourth embodiment to which the present invention is applied will be described with reference to FIGS. 12 and 13. In the fourth embodiment, parts that are configured in the same manner as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
The fourth embodiment is different from the first embodiment in that an expansion enclosure 281 communicating with the lower opening 72 of the headrest stays 15 and 15 is provided in the backrest portion 5.

FIG. 12 is a schematic diagram illustrating a structure of a sheet 201 according to the fourth embodiment. FIG. 13 is a diagram illustrating an internal configuration of the sheet 201.
A seat 201 (acoustic device) as an acoustic device includes a seat surface portion 3, a backrest portion 5, and a headrest device 10.
The backrest 5 includes a seat frame (not shown), a cushion (not shown) provided around the seat frame, and a cover member 280 that covers the cushion.
The cover member 280 includes a backrest front surface portion 280a that is provided on substantially the entire front surface of the backrest portion 5 and contacts the back of the seated person, and a backrest rear surface portion 280b.
The backrest front portion 280a is made of a material having good air permeability, such as resin or cloth. The backrest rear surface portion 280b has a lower air permeability than the backrest front surface portion 280a (has a lower sound permeability than the backrest front surface portion 280a), and is made of a material such as wood, cork, or resin.

A box-shaped expansion enclosure 281 is provided inside the backrest 5. The expansion enclosure 281 is disposed so as to be embedded in the cushion. The expansion enclosure 281 is provided with a port 282 that discharges internal air to the seated person, on the front surface facing the backrest front surface portion 280a.
The headrest stays 15, 15 of the headrest device 10 are connected to the expansion enclosure 281. Specifically, the headrest stays 15, 15 penetrate the upper surface 281 a of the expansion enclosure 281 and enter the internal space of the expansion enclosure 281, and the lower opening 72 of the headrest stays 15, 15 opens into the internal space of the expansion enclosure 281. To do.

That is, the internal space 40 a of the enclosure part 40 and the internal space of the expansion enclosure 281 are communicated via the hollow part 70 of the headrest stays 15 and 15.
The air emitted from the enclosure part 40 by the driving of the acoustic speakers 50 and 50 and the subwoofer 52 flows into the expansion enclosure 281 through the hollow part 70 and is emitted from the port 282 to the front seated person side.
For this reason, the volume of the enclosure of the audio device can be increased by the expansion enclosure 281 to enhance the bass, and the air flow linked to the driving of the acoustic speakers 50 and 50 can be directly applied to the occupant. The sound can be easily felt. In addition, since the volume of the enclosure can be expanded and the bass can be enhanced only by providing the expansion enclosure 281, the port 282 may be omitted.
Further, the backrest front portion 280a is configured to have higher voice volume than the backrest rear portion 280b. For this reason, the sound emitted from the expansion enclosure 281 can be directed and output to the backrest front surface portion 280a side, and a good bass can be felt on the seated person side.

In addition, the said 1st-4th embodiment shows the one aspect | mode which applied this invention, Comprising: This invention is not limited to the said 1st-4th embodiment.
In the above first to fourth embodiments, the control board 53 as a heat generating body, and acoustic signal processing circuit, a control circuit for controlling the acoustic microphone 51 has been described as being mounted However, the present invention is not limited to this. The heating element may be any electronic device, and may be, for example, a control board for controlling the operation of the electric seat, a sensor board built in the headrest device 10, or the like.
In the fourth embodiment described above, the box-shaped expansion enclosure 281 is provided inside the backrest 5, but the present invention is not limited to this. For example, without providing the expansion enclosure 281, the back surface front portion 280 a is formed of a perforated skin or a material having good air permeability so as to have a high air permeability. It is good also as a structure which covers the whole with materials with low air permeability, such as a rubber type. In this case, the sound emitted from the backrest portion 5 can be output by directing it toward the backrest front portion 280a, and the same effect as when the expansion enclosure 281 is provided can be obtained.

1 seat 5 backrest part 10,110 headrest device (acoustic device)
12 Cushion core (core, headrest body)
15, 15, 115, 115 Headrest stay 50, 50 Acoustic speaker 70, 70, 170, 170, 370 Hollow part 71, 171 Upper opening (communication hole)
72 Lower opening (communication hole)
172 Side opening (communication hole)
201 sheet (acoustic device)
281 Expansion enclosure 282 Ports 315, 315 Headrest stay (headrest stay)
371 Upper opening (communication hole)

Claims (5)

The headrest body includes a core material having a sealed structure, a sound speaker disposed on the core material, and a hollow headrest stay that penetrates the core material, and the headrest body includes a backrest of a seat. Inserted into the part and connected to the backrest part,
The headrest stay communicates the internal space of the core member and the interior of the backrest part through a hollow part ,
The headrest stay includes an air communication hole, and the communication hole that opens in the internal space of the core member is located behind the acoustic speaker and opens above the headrest stay. An acoustic device characterized by that. Of the communication holes, the communication hole that opens in the backrest portion is provided on a pipe-shaped end or side surface of the headrest stay ,
When the communication hole is provided on the side surface of the pipe shape, the end of the pipe shape in the backrest portion is closed, and air flows through the communication hole of the side surface,
2. The acoustic device according to claim 1 , wherein when the communication hole is not provided in the side surface of the pipe shape, the end of the pipe shape in the backrest portion is not blocked and air flows through the end. .   The acoustic device according to claim 1, further comprising an expansion enclosure provided inside the backrest, wherein the headrest stay communicates with the expansion enclosure.   The acoustic device according to claim 3, wherein the expansion enclosure includes a port that discharges air to a front side of the backrest portion.   5. The acoustic device according to claim 1, wherein the acoustic speakers are provided in a pair of left and right, and the headrest stay is provided in a pair of left and right at a position close to the acoustic speaker.

Images