JP2005022546A - On-vehicle stereo speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle stereo speaker device with vibrators being directly mounted on a ceiling plate of a vehicle. <P>SOLUTION: A pair of vibrators 8L, 8R are mounted on a flat part of the ceiling plate 5 of the vehicle at a prescribed interval D2. A stereo signal is supplied to the respective vibrators, mounting parts of the vibrators on the ceiling plate are vibrated, and sound waves SL, SR are output to form the stereo speaker device. The interval D<SB>2</SB>is selected to be such a distance to give a listener a stereo feeling. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle-mounted stereo speaker device that is directly attached to a ceiling plate of a vehicle, and in particular, a plurality of vibration devices are directly attached to a ceiling plate of a vehicle at a predetermined interval, and a part of the ceiling plate is the vibration. The present invention relates to an in-vehicle stereo speaker device used as a diaphragm of the device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a speaker device has been used to perform acoustic reproduction of music and voice in a vehicle, for example, a passenger compartment of a passenger car. The speaker device is embedded in, for example, a door for a front seat, or further placed on a rear tray, and a plurality of speaker devices are mounted on at least one of the front seat and the rear seat. It is common to be mounted and arranged correspondingly.
[0003]
Therefore, in addition to arranging the speaker device related to sound reproduction in the front seat door or on the rear tray, it has been proposed to arrange the speaker device on the ceiling plate in the vehicle interior (for example, Patent Document 1). See).
[0004]
The speaker device described in Patent Document 1 will be described with reference to FIGS. In order to cope with the fact that when a normal speaker device is mounted in a vehicle interior, there are restrictions on the mounting position of the speaker device, and a speaker device having a very large aperture cannot be used. Instead of a speaker device having a caliber, a speaker device directly attached to a ceiling board is used.
[0005]
In the prior art, the effect of the heavy bass possessed by the speaker device having a large aperture is used as an enclosure in the door or the trunk room, and the heavy bass is enhanced by resonance of the enclosure. Furthermore, in another conventional technique, signal processing is performed so as to enhance deep bass using a so-called digital signal processor or the like.
[0006]
However, in these prior arts, the distance from the speaker device embedded in the door and the speaker device placed on the rear tray to the listener riding in the front seat and the rear seat is greatly different. Therefore, there is a problem that the balance of the sound field is lost. Furthermore, in particular, the speaker device embedded in the door emits sound from below the listening position, and there is a problem that there is insufficient sound effective for localization of the sound image. Sound reproduction with no.
[0007]
Therefore, in the proposed in-vehicle speaker device, in consideration of these problems, at least a part of the ceiling plate of the passenger car is used as a diaphragm, and a speaker main body capable of reproducing at least a mid-high range, The opening is attached so as to face the passenger compartment side of the passenger car.
[0008]
FIG. 3 shows a state in which the proposed in-vehicle speaker device is incorporated in a passenger car by a partial longitudinal sectional view of the passenger car. In the passenger compartment of the passenger car 1, a front seat 3 including a driver's seat and a rear seat 4 are provided. A front speaker 6 is embedded in the door with respect to the front seat 3, and a rear speaker 7 is placed on the rear tray of the rear seat 10. The ceiling portion of the passenger car 1 includes an outer plate 2 and a ceiling plate 5, and a vibration device 8 described later is attached near the center of the ceiling plate 5 to constitute a speaker device.
[0009]
FIG. 2 is an enlarged cross-sectional view of the vicinity of the attached vibration device 8 in that the vibration device 8 is directly attached to the ceiling board 5 to form a speaker device. In the vibration device 8, an outer magnet type magnetic circuit is formed so as to sandwich an annular magnet 85 between the plate 84 and the base plate of the pole piece 86. A voice coil 82 is provided in the gap between the pole piece 86 forming the magnetic circuit and the plate 14. The voice coil 82 is wound around the bobbin 81, and the pedestal portion of the bobbin 81 is fixed to the ceiling plate 5. A damper 83 attached to the plate 84 is fixed to the pedestal portion of the bobbin 81.
[0010]
Since the ceiling plate 5 is usually formed of a material such as urethane or foamed PP, the ceiling plate 5 itself serves as a diaphragm. Therefore, when an AC signal is applied to the voice coil 82, the ceiling plate 5 connected to the bobbin 81 around which the voice coil 82 is wound can be vibrated to generate sound corresponding to the AC signal. Thus, by using the ceiling plate 5 as a diaphragm, a good sound field can be formed. Further, the vibration device 8 may be attached between the outer plate 2 and the ceiling plate 5, but the same effect can be obtained when the vibration device 8 is attached to the vehicle interior side of the ceiling plate 5 as indicated by a broken line in FIG. 3. Is obtained.
[0011]
As described above, the proposed in-vehicle speaker device uses a part of the ceiling plate of the passenger car as a diaphragm, and is attached to the remaining part of the ceiling plate via a damper or the like. For example, a free end portion of a bobbin around which a voice coil is wound may be fixed to the diaphragm, while the magnetic circuit may be attached to the inside of the vehicle body corresponding to the bobbin. It may be attached to the side of the outer plate that covers the interior material. By using the ceiling in this way, a good sound field can be formed without sacrificing the space in the vehicle interior.
[0012]
This in-vehicle speaker device includes a magnetic circuit, a frame, a diaphragm, etc., is disposed near the ceiling of a passenger car, and is attached so that the opening of the speaker device body faces the ceiling side. By making the area reproducible and installing the speaker device on the ceiling, it is possible to enhance the realistic sensation of the sound field and to form a better vehicle interior sound field.
[0013]
[Patent Document 1]
Japanese Utility Model Publication No. 6-45865 [0014]
[Problems to be solved by the invention]
By the way, in the passenger compartment of a passenger car in which the vehicle-mounted speaker device proposed in Patent Document 1 is employed, a front speaker originally embedded in a door, and a rear speaker placed on a rear tray on the rear seat side, The space for sound stereo reproduction is formed by this, and the purpose of attaching this in-vehicle stereo device to the ceiling part is that it is easy to secure a large opening, and good heavy bass reproduction is possible A stereo reproduction space is to be obtained.
[0015]
For this reason, when a stereo reproduction space is formed in the passenger compartment of a passenger car, there is a problem in that an in-vehicle speaker device is required in addition to a front speaker and a rear speaker depending on the prior art, resulting in an increase in cost.
[0016]
Therefore, the present invention provides an in-vehicle device in which a plurality of vibration devices are directly mounted on a ceiling plate of a ceiling portion of the vehicle compartment at a predetermined interval in order to form a stereo reproduction space in a vehicle interior such as a vehicle. An object is to provide a stereo speaker device.
[0017]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, in a vehicle-mounted stereo speaker device provided on a ceiling plate of a vehicle cabin such as a vehicle, a plurality of vibration devices are attached to the ceiling plate of the vehicle at predetermined intervals, A stereo signal is supplied to each of the vibration devices to vibrate the mounting portion of the vibration device on the ceiling plate.
[0018]
Further, the plurality of vibration devices are attached to a flat portion of the ceiling plate, and the predetermined interval is any one of the position of a sound image when the same sound wave is output by each vibration device and the vibration device. It is set to a distance that is recognized as being separated from the position of the sound image related to the sound wave by one, and the pair of the vibration devices is set to the distance from the listening position inside the vehicle. It was decided to be attached to the ceiling board at a position left and left.
[0019]
And the said vibration apparatus used for the vehicle-mounted stereo speaker apparatus of this invention is arrange | positioned between the structural members of the magnetic circuit containing a magnet, The voice coil to which the said stereo signal is supplied, and this voice coil were wound A bobbin, and an end of the bobbin is mounted on the ceiling plate, and the constituent member is fixed to the end or the other end via a damper member. did.
[0020]
The in-vehicle stereo speaker device configured as described above can form a stereo reproduction space in the vehicle interior only by the stereo speaker device without a front speaker or a rear speaker, and obtain a good vehicle interior sound field. be able to.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the in-vehicle stereo speaker device of the present invention will be described with reference to the drawings.
[0022]
The in-vehicle stereo speaker device of the present embodiment is based on a vibration device that is directly attached to the ceiling plate of the passenger car shown in FIG. A plurality of vibration devices having voice coils to which stereo signals are supplied are arranged at appropriate intervals on a ceiling plate forming a ceiling portion of a vehicle, for example, a passenger car. I tried to install it. A plurality of vibration devices cause a part of the ceiling plate to directly act as a diaphragm of the speaker, and generate a sound wave corresponding to the stereo signal supplied to each voice coil from a part of the corresponding ceiling plate.
[0023]
Here, when attention is paid to a plurality of vibration devices, for example, a pair of vibration devices, they are attached to a common ceiling plate and a part of the ceiling plate is used as a vibration plate. If the interval between the two is too small, even if the vibration devices driven by the stereo signals are mounted independently and apart from each other, the stereo sense may be impaired in the listener's sense of hearing, resulting in a monaural sensation. I understood.
[0024]
Therefore, FIG. 5 shows an example of sound wave emission when a pair of vibration devices are mounted on a common ceiling board and the arrangement interval is narrow. In FIG. 3, as shown in FIG. 3, the ceiling portion to which the vibration device is attached is mainly shown. For example, two vibration devices 8 _L and 8 _R are attached to the side of the outer plate 2 of the ceiling plate 5 so that stereo reproduction can be realized using the vibration device 8 as shown in FIG. It is shown.
[0025]
In FIG. 5, the two vibration devices 8 _L and 8 _R are mounted on the ceiling plate 5 with a distance D ₁ therebetween. When stereo signals are supplied to the voice coils provided in the vibration devices 8 _L and 8 _R , a part of the ceiling plate 5 to which the vibration devices 8 _L and 8 _R are respectively attached is used as a vibration plate. _L outputs the sound wave S _L and the vibration device 8 _R individually outputs the sound wave S _R to the passenger compartment side.
[0026]
However, for listeners sitting in the front seat or rear seat of the vehicle interior, the sound waves S _L and S _R are above the head, and each sound wave is listened to at some distance from these sound sources. Will do. Therefore, the distance D ₁ of the the vibration device 8 _L and 8 _R, small and is mounted in a state that both of the vibration device is close, there is no different than that acting in a common diaphragm single Therefore, when the sound waves S _L and S _R reach the listener, the sound waves are mixed, and a stereo feeling cannot be obtained, and the sound is heard as if it were monaural reproduction.
[0027]
Therefore, in order to solve the problem that the sound is heard as if it is monaural reproduction, in the in-vehicle stereo speaker device of this embodiment, a plurality of vibration devices are attached to the ceiling plate of a vehicle, for example, a passenger car. In some cases, the vibration devices are arranged apart from each other by a predetermined distance.
[0028]
FIG. 1 shows a state in which the vibration devices are arranged apart from each other by a predetermined distance. In the figure, two vibration devices 8 _L and 8 _R are mounted on the ceiling plate 5 with a distance D ₂ apart. When stereo signals are supplied to the voice coils provided in the vibration devices 8 _L and 8 _R , a part of the ceiling plate 5 to which the vibration devices 8 _L and 8 _R are respectively attached is used as a vibration plate. _L is an acoustic wave _{S L,} then the vibration device _{8 R} can output the sound wave _{S R} individually to the cabin side.
[0029]
Here, the interval D ₂ is wider than the distance D ₁ in FIG. 5, for example, formed of a material such as urethane or foamed PP, in a case of a ceiling plate which is commonly used for this spacing _{D 2} is selected from 40cm to the size of the extent than 60cm. The size of the interval D ₂ is, in fact, by using the vehicle-mounted stereo speaker device fitted with a pair of the vibration device in the ceiling plate is determined by the listener's audible experiments.
[0030]
An example of experimental Determination of the interval D _2, can be the following procedure. First, the same experimental signal is simultaneously supplied to a pair of vibration devices 8 _L and 8 _R attached to an actual ceiling board, and sound waves S _L and S _R as a speaker device are output. At this time, the experimenter confirms the position of the sound image by the sound waves S _L and S _R. Then, by supplying the same experiment signal on either of the pair of the vibration device 8 _L, 8 _R, and it outputs the sound wave S _L or sonic S _R.
[0031]
Therefore, the position of the sound image by the sound wave S _L or S _R was confirmed by the experimenter, the deviation degree between the position of the sound image by both wave S _L and wave S _R, confirmed by hearing the experimenter. Here, when the positions of the sound images are almost the same or when it is felt that they are not so shifted, it means that the distance D ₂ between the pair of vibration devices 8 _L and 8 _R is too close. ing. The position of the sound image of each is, when it is Kanze and are displaced, the distance D ₂ of the pair of the vibration device 8 _L, 8 _R is a stereo is large enough intact be able to.
[0032]
In the in-vehicle stereo speaker device of the present embodiment, the distance between the vibration devices is experimentally determined so that a stereo feeling can be obtained in a state where the vibration device is directly attached to a ceiling board that is actually used. As a result, the obtained size of the interval reflects the characteristics of each vibration device and the characteristics and shape of the ceiling board itself.
[0033]
In the above, the method of calculating the distance D ₂ at the time of attaching the pair of the vibration device 8 _L, 8 _R the ceiling board has been described an example. On the other hand, it is a fact of acoustic engineering that the wider the interval between the pair of speaker devices, the more the listener can obtain a stereo feeling. The pair of vibration devices 8 _L and 8 _R are mounted on the ceiling board and mounted on the vehicle. even in the case of the use stereo speaker device, similarly, wide end of the interval D ₂ is good stereo is obtained, the sound field is widened.
[0034]
Therefore, when the in-vehicle stereo speaker device by the pair of vibration devices 8 _L and 8 _R is formed on the ceiling plate of the vehicle, as shown in FIG. 1, the pair of vibration devices 8 _L with reference to the listener. , 8 _R is distributed to the left and right of the listener, so that the interval D ₂ spreads, when attached to the ceiling plate 5, a good stereo feeling is obtained. In this case, as a listener, the driver can be set as the center, or the passenger in the rear seat can be set as the center. When the vibration device is distributed to the left and right in this way, the listener can obtain a sound field that spreads substantially from the front to the left of the listener, rather than a stereo feeling in a sound field biased to either the left or right.
[0035]
By the way, in order to obtain a good stereo feeling, it is preferable that the mounting positions of the plurality of vibration devices on the ceiling plate are as far apart as possible. However, in a ceiling plate of a vehicle, for example, a passenger car, the size of the vibration device is not limited. In addition, the ceiling plate is partially deformed for the convenience of mounting the ceiling plate to the vehicle body or for the strength of the ceiling plate itself. Furthermore, when attaching the vibration device to the ceiling plate, a part of the ceiling plate is used as the vibration plate of the vibration device. Therefore, the ceiling plate at the position where the vibration device is attached may be flat in consideration of speaker characteristics. preferable. When there is a sudden change in the plate shape at the position where the vibration device is attached, the clarity of the sound image is lowered. For this reason, in order to form a vehicle-mounted stereo speaker device by directly attaching a plurality of vibration devices to a vehicle ceiling board, as shown in FIG.
[0036]
In FIG. 2, the longitudinal cross-section is shown as an example of the ceiling board in the ceiling part of a vehicle. The ceiling plate 5 shown in the figure is provided with a suddenly changing shape at an edge portion attached to the vehicle body, and is flattened at a central portion surrounded by the edge portion. When a pair of vibration devices are attached to the ceiling plate 5 illustrated in this manner, the attachment position of the vibration device 8 _L in the flat portion of the ceiling plate 5 is in the range d _L in consideration of the above-described attachment requirements. , the mounting position of the vibration device _{8 R} is a range _{d R.} Further, each of the vibration devices so as to fall within the scope of each securing an interval D ₂ stereo feeling is obtained. However, also in the flat part of the ceiling board 5, when the sudden change part of a shape exists in the intermediate part, this sudden change part is avoided and a vibration apparatus will be attached in the position away from there. By not attaching the vibration device to the sudden change portion of the ceiling board, it is possible to obtain a stereo feeling and improve the clarity of the sound image.
[0037]
As described above, a plurality of vibration devices are directly mounted on the ceiling plate of the vehicle, and by arranging them at appropriate intervals, a part of the ceiling plate can be used as the vibration plate of the speaker device, so that a good stereo feeling can be obtained. A vehicle-mounted stereo speaker device is obtained.
[0038]
Heretofore, a plurality of vibration devices of the in-vehicle stereo speaker device have been described by taking as an example a case where the plurality of vibration devices are mounted on the upper side of the vehicle ceiling plate, that is, using the gap between the vehicle outer plate and the ceiling plate. A plurality of vibration devices may be directly attached to the side surface of the ceiling plate. Further, a plurality of vibration devices may be directly attached to the ceiling plate, such as for front seats or rear seats.
[0039]
【The invention's effect】
As described above, according to the in-vehicle stereo speaker device of the present invention, a plurality of vibration devices are directly mounted on the ceiling plate at intervals from each other on the ceiling plate of the vehicle. When the interval is selected, a stereo speaker device using a part of the ceiling plate as a diaphragm can be obtained. When stereo signals are supplied to a plurality of vibration devices, good stereo reproduction can be realized in the passenger compartment.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a state in which a vehicle-mounted stereo speaker device according to the present invention is attached to a ceiling interior board of a vehicle.
FIG. 2 is a diagram for explaining a limitation when an in-vehicle stereo speaker device according to the present invention is attached to a ceiling interior board of a vehicle.
FIG. 3 is a diagram for explaining a state where a conventional in-vehicle speaker device is attached to a ceiling interior board of a vehicle.
FIG. 4 is a view showing a longitudinal section of a conventional in-vehicle speaker device.
FIG. 5 is a diagram for explaining a state in which the in-vehicle speaker device is mounted in juxtaposition with the ceiling interior board of the vehicle.
[Explanation of symbols]
1 ... vehicle 2 ... ceiling plate 3 ... front seat 4 ... rear seat 5 ... ceiling interior plate 6 ... front speaker 7 ... rear speakers 8, 8 _L, 8 R _... vibration device 81 ... bobbin 82 ... voice coil 83 ... damper 84 ... plate 85 ... annular magnet 86 ... pole piece

Claims (5)

A plurality of vibration devices attached to the ceiling plate of the vehicle at a predetermined interval;
A vehicle-mounted stereo speaker device in which a stereo signal is supplied to each of the vibration devices to vibrate a mounting portion of the vibration device on the ceiling panel. The in-vehicle stereo speaker device according to claim 1, wherein the plurality of vibration devices are attached to a flat portion of the ceiling board. The predetermined interval is set to a distance at which it is recognized that the position of the sound image when the same sound wave is output by each vibration device and the position of the sound image related to the sound wave by any one of the vibration devices are separated. The in-vehicle stereo speaker device according to claim 2, wherein the in-vehicle stereo speaker device is provided. 4. The in-vehicle stereo according to claim 3, wherein the pair of the vibration devices are attached to the ceiling plate at positions spaced apart from each other at a distance when viewed from a listening position in a room of the vehicle. Speaker device. The vibration device includes a voice coil that is disposed between components of a magnetic circuit including a magnet and is supplied with the stereo signal, and a bobbin around which the voice coil is wound,
The end portion of the bobbin is attached on the ceiling plate, and the component member is fixed to the end portion or the other end portion via a damper member. The in-vehicle stereo speaker device according to the item.

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