WO2016199318A1

WO2016199318A1 - Mobile object speaker system

Info

Publication number: WO2016199318A1
Application number: PCT/JP2015/074529
Authority: WO
Inventors: 孝之根岸; 泰美梅津
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2015-06-09
Filing date: 2015-08-28
Publication date: 2016-12-15

Abstract

Provided is a mobile object speaker system capable of improving the acoustic characteristic of a low register. One end (4A) of a pipe member (4) communicates with an interior space of an enclosure (3) that houses a speaker unit (2). The other end (4B) of the pipe member (4) is opened toward a corner (C1) at which three among a plurality of surfaces surrounding a cabin space (A1) intersect. Accordingly, a low tone emitted from the other end (4B) more easily reverberates in the cabin space (A1) by being reflected by the three surfaces, thereby making it possible to improve the acoustic characteristic of a low register in a mobile object speaker system (1A).

Description

Speaker system for moving objects

The present invention relates to a speaker system for a moving body.

2. Description of the Related Art Conventionally, a vehicle-mounted speaker device (speaker system for a moving body) using a sound radiated from the back side has been proposed (see, for example, Patent Document 1) while a speaker is disposed in an instrument panel of a vehicle. . In the conventional vehicle-mounted speaker device described in Patent Document 1, a speaker is installed with the upper surface of the instrument panel as the front side, and the speaker is accommodated in a cylindrical acoustic tube (tube member). Moreover, the low-frequency component of the sound generated on the back side of the speaker resonates in the acoustic tube and is emitted from the lower surface of the instrument panel.

Japanese Utility Model Publication No. 1-143595

However, in the vehicle-mounted speaker device described in Patent Document 1, the sound radiated from the acoustic tube is less likely to reverberate in the vehicle interior space, and the acoustic characteristics in the low frequency range cannot be sufficiently improved.

Therefore, an object of the present invention is, for example, to provide a moving body speaker system capable of improving the acoustic characteristics in the low sound range.

In order to solve the above-described problems and achieve the object, a moving body speaker system according to a first aspect of the present invention includes a speaker unit that emits sound from the front surface toward a box-shaped space formed by the moving body. A housing part for housing the back surface of the speaker unit, and a tube member having one end communicating with the internal space of the housing unit, wherein the other end of the tube member is at least two of a plurality of surfaces surrounding the space. It is characterized by opening toward the intersection where the two intersect.

It is a side view which shows the mobile body provided with the speaker system for mobile bodies which concerns on Example 1 of this invention. It is a front view which shows the principal part of the tube member of the said speaker system for moving bodies. It is a perspective view which shows the said pipe member. 6 is a graph showing frequency dependence of sound pressure in the moving body speaker system and the moving body speaker system of Comparative Example 1; It is a side view which shows the mobile body provided with the speaker system for mobile bodies which concerns on Example 2 of this invention. It is a graph which shows the frequency dependence of the sound pressure in the said speaker system for mobile bodies and the speaker system for mobile bodies of the comparative example 2. It is a front view which shows the speaker unit of the speaker system for moving bodies which concerns on the 1st and 2nd modification of this invention. It is a side view which shows the speaker system for moving bodies which concerns on the 3rd modification of this invention. It is a side view which shows the speaker system for moving bodies which concerns on the 4th modification of this invention. It is a rear view which shows the speaker system for moving bodies which concerns on the 5th modification of this invention. It is a top view which shows the speaker system for moving bodies which concerns on the 6th modification of this invention. It is the perspective view and side view which show the speaker system for moving bodies which concerns on the 7th modification of this invention.

Hereinafter, embodiments of the present invention will be described. The moving body speaker system according to the first embodiment of the present invention includes a speaker unit that emits sound from the front surface toward a box-shaped space formed by the moving body, a housing portion that houses the back surface of the speaker unit, and A pipe member having one end communicating with the internal space of the housing portion. The other end of the tube member opens toward the intersection where at least two of the plurality of surfaces surrounding the space intersect. Here, the moving body forming the box-shaped space has a plurality of surfaces. For example, in the traveling direction of the moving body, the front surface, the rear surface, the left side surface, the right side surface, the lower surface (bottom surface), and the upper surface ( It has a top surface.

One end of the tube member communicates with the internal space of the housing portion (the space for housing the speaker unit), so that a low frequency component corresponding to the length of the tube member among the sounds generated on the back side of the speaker unit. Resonates in the tube member and is emitted from the other end. In addition, the accommodating part and the pipe member may be integrally formed. Furthermore, the other end of the tube member opens toward the intersection where at least two of the plurality of surfaces surrounding the space of the moving body intersect, so that the bass emitted from the other end is reflected by at least two surfaces. Thus, it is easy to reverberate in the space of the moving body, and the acoustic characteristics such as the sound pressure in the low range in the moving body speaker system can be improved.

It is preferable that the other end of the pipe member is open toward the corner where three of the plurality of surfaces intersect. Thereby, the low frequency sound radiated from the other end is reflected on the three surfaces and easily echoes in the space of the moving body, and the acoustic characteristics such as the sound pressure in the low frequency range in the moving body speaker system can be further improved. .

It is preferable that the speaker unit emits sound so that the sound pressure in the mid-high range is higher than the sound pressure in the low range. Thereby, the vibration of the speaker unit can be reduced, and it is possible to suppress the generation of abnormal noise due to the vibration transmitted to the members (such as the vehicle body) constituting the outline of the moving body. In addition, by improving the low-frequency acoustic characteristics as described above, even when a small speaker unit having a low sound pressure in the low-frequency range is used, good acoustic characteristics can be obtained. Furthermore, although the sounds radiated from the front side and the back side of the speaker unit are in opposite phases and tend to weaken in the space, the sound pressure of the bass emitted from the front side of the speaker unit is relatively low, In the low sound range, the sound pressure of the synthesized sound of the sound radiated from the front surface of the speaker unit and the sound radiated from the other end of the tube member can be hardly lowered.

The speaker unit is provided in the instrument panel so as to emit sound from the front side on the upper surface of the instrument panel of the moving body, and the other end of the pipe member is provided below the instrument panel. It is preferable that the front surface, the lower surface, and the side surface of the surface are open toward the corner portion. Thereby, the speaker unit is provided in the instrument panel, and the sound emitted from the front side on the upper surface of the instrument panel can be easily delivered to the passenger.

Furthermore, the other end of the tube member is opened toward the corner where the front surface, the lower surface, and the side surface of the moving body intersect below the instrument panel, and is emitted from the other end and reflected around the corner portion. The sound travels toward the opposite corner (the corner where the rear surface, the upper surface, and the opposite side surface of the moving body intersect), and forms a standing wave between the corners. At this time, since the distance between the corners is longer than the distance between the pair of opposing surfaces, a standing wave having a long wavelength can be formed, and the bass can be efficiently reflected in the space of the moving body. Can do.

It is preferable that the speaker unit and the housing portion are provided in the instrument panel, and the tube member passes through the instrument panel. As a result, the speaker unit and the housing portion are provided in the instrument panel, and the tube member passes through the instrument panel, so that the appearance of the mobile body is kept good when the mobile body speaker system is provided in the mobile body. Can do. Moreover, even if the vicinity of the other end of the pipe member is exposed by protruding from the instrument panel, the other end is less noticeable because it is located below the instrument panel.

It is preferable that the cross-sectional shape of the pipe member changes toward the other end in at least one region in the longitudinal direction. Thereby, the acoustic characteristics of the sound radiated from the other end of the tube member can be improved. Moreover, it is more preferable that the cross-sectional shape of the pipe member changes in the region near the other end toward the other end.

The speaker unit and the accommodating portion are provided below the seat of the moving body, a part of the tube member is integrated with the air conditioning duct of the moving body, and the tube member extends toward the front side in the moving direction of the moving body. It is good also as a structure. Thus, the cost can be reduced by using the air conditioning duct as a pipe member, and the space formed in the moving body can be used to pass the duct. A part of the pipe member may be shared as a passage portion through which hot air or cold air passes in the air conditioning duct. Further, the passage portion may be divided by the partition portion to have two or more passages, and one passage may be used for passing hot air or cold air, and the other passage may be a part of the pipe member. Moreover, even if the installation space of the speaker unit below the seat is small (that is, even if the speaker unit is downsized), the other end of the tube member opens toward the intersection, so that the sound pressure in the low frequency range is reduced. Such acoustic characteristics can be improved.

The housing part is a part of the box part provided on the instrument panel of the moving body, the front surface of the speaker unit is directed to the outside of the box part, and the other end of the tube member is in the traveling direction of the moving body. It is good also as a structure which has opened toward the cross | intersection part which a front surface and a lower surface cross at least. Thereby, the sound radiated from the back side of the speaker unit can be reflected using the space inside the box. Furthermore, the instrument panel is provided on the front side of the moving body, and the other end of the tube member is easily directed to the intersection where the front surface and the lower surface of the moving body intersect. Moreover, even if the speaker unit is reduced in size to suppress the narrowing of the space in the box part, the other end of the tube member opens toward the intersection, so that acoustic characteristics such as sound pressure in the low frequency range can be obtained. Can be improved.

The speaker unit and the housing portion may be provided in a wheel of a spare tire housed in a box-shaped space formed by the moving body. Thereby, the speaker unit and the housing portion can be installed using the space in the wheel of the spare tire. Note that when the wheel of the spare tire is attached to the moving body and viewed from the width direction, one of the surfaces (for example, the inner surface in the width direction of the moving body) is formed in a concave shape. Arrangement of the speaker unit and the accommodating portion in the concave portion is referred to as “accommodated in the wheel”. In addition, the speaker unit and the housing portion may be entirely housed in the wheel, or may be partly housed. As a result, even if the speaker unit is downsized to be accommodated in the wheel of a spare tire, the other end of the tube member opens toward the intersection, improving acoustic characteristics such as sound pressure in the low frequency range. Can be made.

The speaker unit and the housing portion are provided in the center portion in the width direction of the moving body, and two tube members are connected to the housing portion, and the two tube members extend toward the opposite sides in the width direction, It is good also as a structure which the other end opens toward the cross | intersection part where the side surface of a moving body and at least one other surface cross. Thereby, the low sound radiated | emitted from the other end of the pipe member in both sides of the width direction reverberates, and it can be set as the reproduction sound which is powerful for a passenger. Moreover, even if the installation space of the speaker unit is narrow at the center in the width direction, the other end of the tube member opens toward the intersection, so that acoustic characteristics such as sound pressure in the low frequency range can be improved. .

The speaker unit and the housing portion are provided in the vicinity of the intersection on the rear side in the moving direction of the moving body, the tube member passes through the inside of the side sill of the moving body, and the other end is on the front side of the side sill in the moving direction. It is good also as a structure opened toward the crossing part. Thereby, the bass radiated by the other end of the tube member is reflected at the intersection, and the acoustic characteristics such as the sound pressure in the bass range can be further improved. Further, the speaker unit may be a speaker unit for low sound reproduction (for example, a speaker unit capable of reproducing sound of 100 Hz or less, or a speaker unit having a minimum resonance frequency of 100 Hz or less). Sound waves with a frequency of 100 Hz or less are less likely to feel directivity, and even if a speaker unit that emits such sound waves is arranged far away from the passenger, the sound waves can be sufficiently transmitted.

A moving body speaker system according to a second embodiment of the present invention includes a speaker unit that emits sound from the front surface toward a box-shaped space formed by the moving body, and a storage section that stores the back surface of the speaker unit. A pipe member having one end communicating with the internal space of the housing portion. The other end of the tube member opens toward at least one of a plurality of surfaces surrounding the space.

The other end of the tube member opens toward at least one of a plurality of surfaces surrounding the space of the moving body, so that bass radiated from the other end is reflected by at least one surface and the space of the moving body The acoustic characteristics such as the sound pressure in the low frequency range in the speaker system for moving bodies can be improved.

A speaker system for a moving body according to a third embodiment of the present invention includes a speaker unit that emits sound from the front side toward a box-shaped space formed by the moving body, a housing portion that houses the speaker unit, and a housing A pipe member having one end communicating with the internal space of the unit. The other end of the tube member is disposed in the vicinity of the first intersection where the front surface and the upper surface or the lower surface of the moving body intersect, or in the vicinity of the second intersection where the rear surface of the movable body and the upper or lower surface intersect.

The other end of the pipe member is arranged in the first intersection or the second intersection, that is, in the vicinity of the passenger's head or the foot on the front side of the moving body, or in the vicinity of the passenger's head or the foot on the rear side. As a result, the sound radiated from the other end of the tube member travels toward the other intersection, and forms a standing wave between the intersections. At this time, since the distance between the intersections is longer than the distance between a pair of opposing surfaces among a plurality of surfaces surrounding the space, a standing wave having a long wavelength can be formed, With this, bass can be efficiently reflected.

In addition, the mobile body in the present embodiment includes the above mobile body speaker system. According to such a moving body, it is possible to improve low-frequency acoustic characteristics in a box-shaped space by emitting sound to the moving body speaker system.

Hereinafter, each embodiment of the present invention will be described in detail. In the second embodiment, the same constituent members as those described in the first embodiment and the constituent members having similar functions are denoted by the same reference numerals as those in the first embodiment and the description thereof is omitted.

<Example 1>
FIG. 1 is a side view showing a vehicle C provided with a moving body speaker system 1A according to a first embodiment of the present invention, and FIG. 2 shows a main part of a tube member 4 of the moving body speaker system 1A. 3 is a front view, FIG. 3 is a perspective view showing the pipe member 4, and FIG. 4 is a frequency dependence of sound pressure in the moving body speaker system 1A of the first embodiment and the moving body speaker system of the first comparative example. It is a graph which shows.

As shown in FIG. 1, the moving body speaker system 1 A is provided in a vehicle C as a moving body, and is connected to the speaker unit 2, an enclosure 3 as a housing portion that houses the speaker unit 2, and the enclosure 3. A pipe member 4.

The vehicle C includes an inner surface of a windshield (front glass) W, an upper surface S1 and a lower surface S2 of the vehicle body, a front surface S3 in the traveling direction of the vehicle C, and a pair of side surfaces S4 (vehicle door bodies facing each other in the width direction). And a rear surface (not shown) in the traveling direction of the vehicle C, a box-shaped vehicle interior space A1 is formed. In addition, an instrument panel I is provided on the front surface S3, and a seat (driver's seat and passenger seat) SH is provided so as to face the rear side of the instrument panel I. In the present embodiment, the moving body speaker system 1A is provided on the front side of the driver's seat, but may be provided on the front side of the passenger seat or may be provided on both sides. The vehicle body may have a panel and a frame (hollow body), and examples thereof include a monocoque body.

The speaker unit 2 includes a diaphragm, a voice coil, an edge that supports the diaphragm, a magnetic circuit that can drive the diaphragm, a frame that supports the edge and the magnetic circuit, and a damper that suppresses natural vibration of the diaphragm. And comprising. The speaker unit 2 may emit sound so that the sound pressure in the middle and high sound range (for example, 1000 to 10000 Hz) is higher than the sound pressure in the low sound region (for example, 10 to 1000 Hz). The diaphragm is installed so that the speaker unit 2 emits sound (front side) upward and the magnetic circuit side (rear side) faces downward. Further, the speaker unit 2 is attached to the instrument panel I so that the vibration direction (sound radiation direction) of the diaphragm of the speaker unit 2 is inclined by a predetermined angle (for example, 30 °) with respect to the upper surface of the instrument panel I. It may be provided. The inclination angle of the diaphragm may be set as appropriate according to the angle of the windshield W, the distance between the speaker unit 2 and the seat SH, and the central axis or the diaphragm of the speaker unit 2 is inclined. It does not have to be. Further, the central axis or the diaphragm of the speaker unit 2 may be directed to the driver seat or the passenger seat.

The enclosure 3 is formed in a box shape and is provided in the instrument panel I, a diaphragm is disposed on the top surface thereof, and the speaker unit 2 is disposed in an internal space formed by a bottom surface and four side surfaces, The rear surface of the speaker unit 2 is accommodated in the enclosure 3. Further, the enclosure 3 may be provided with an inclination corresponding to the diaphragm. The enclosure 3 is disposed in the vicinity of the side surface S4 in the width direction. By accommodating the speaker unit 2 in such an enclosure 3, the speaker unit 2 is provided in the instrument panel I so as to emit sound from the front surface on the upper surface of the instrument panel I. Further, the sound generated on the back side of the speaker unit 2 is radiated toward the internal space of the enclosure.

The tube member 4 is formed in a cylindrical shape having both ends opened by an appropriate metal, resin, or the like. One end 4A is connected to the lower surface of the enclosure 3 on the back side of the speaker unit 2, and the other end is connected to the lower surface of the enclosure 3. 4B is arranged at the foot of the driver's seat (near the accelerator pedal). The cross-sectional shape and cross-sectional area of the tube member 4 are substantially constant from one end 4A side to the other end 4B side, and a resonance frequency (for example, 30 to 100 Hz) corresponding to a standing wave formed in the vehicle interior space A1, as will be described later. It is formed in such a length that it has. The pipe member 4 is connected to the inner space of the enclosure 3 at one end 4A by connecting one end 4A to the bottom surface of the enclosure 3. As shown in FIGS. 2 and 3, the other end 4 B opens toward the corner C 1 where the front surface S 3, the lower surface S 2, and the side surface S 4 on the driver seat side are below the instrument panel I. .

The pipe member 4 passes through the instrument panel I on the one end 4A side, and protrudes to the outside of the instrument panel I on the other end 4B side. Further, the pipe member 4 extends from the one end 4A to the other end 4B in the width direction so as to be once separated from the side surface S4 on the driver's seat side, and then extends so as to approach the side surface S4 again. That is, when the tube member 4 is viewed from the front-rear direction (the traveling direction of the vehicle C), it has a shape that is convexly curved toward the passenger seat side. Moreover, the pipe member 4 is extended in the front-back direction so that it may go to the front side as it goes to the other end 4B from the one end 4A.

The following describes the sound progression and reflection when the speaker unit 2 radiates sound in the mobile speaker system 1A as described above. First, the sound radiated from the front side of the speaker unit 2 travels obliquely rearward according to the inclination of the diaphragm and heads near the headrest (driver's head) of the driver's seat. Note that the sound radiated from the front side may be reflected by the windshield W or the upper surface S1 and directed toward the headrest.

The sound generated on the back side of the speaker unit 2 reverberates in the internal space of the enclosure 3, enters the pipe member 4 from one end 4 A, and travels through the pipe member 4. At this time, of the sound generated on the back side of the speaker unit 2, a low-frequency component corresponding to the length of the tube member 4 resonates in the tube member 4. Therefore, the other end 4B of the tube member 4 emits a sound mainly composed of a low-frequency component. The sound radiated from the other end 4B is reflected by the corner portion C1 and the surrounding surfaces S2 to S4, and is opposed to the corner portion C1 (the corner portion where the upper surface S1, the rear surface, and the side surface on the passenger seat side intersect). ), Is reflected again at the opposite corner and its surroundings, and proceeds toward the corner C1. In this way, a standing wave having a wavelength corresponding to the distance between the corner C1 and the opposing corner is generated by the sound wave traveling from the corner C1 toward the opposing corner and the sound wave from the opposing corner toward the corner C1. It is formed. The frequency of the standing wave and the resonance frequency of the tube member 4 are substantially the same, and the bass amplified by the tube member 4 and emitted from the other end 4B forms a standing wave in the vehicle interior space A1. . As described above, since the pipe member 4 has a resonance frequency corresponding to the standing wave formed in the vehicle interior space A1, the resonated component of the sound radiated from the other end 4B generates the standing wave. Form.

As a result of the sound being radiated as described above, the vehicle interior space A1 is radiated mainly from the middle and high frequency range components radiated from the front side of the speaker unit 2 and from the other end 4B of the tube member 4. Sounds mainly composed of low-frequency components.

Here, the acoustic characteristics of the moving body speaker system 1A of the first embodiment will be specifically described. First, in the moving body speaker system 1A of Example 1, the capacity (volume of the internal space) of the enclosure 3 was 1 L, the inner diameter of the tube member 4 was 32 mm, and the length of the tube member 4 was 500 mm. In the moving body speaker system 1 A, the other end 4 B of the tube member 4 is closed so that almost no sound is radiated. For the moving body speaker systems of Example 1 and Comparative Example 1, the frequency dependence of sound pressure was measured in the vicinity of the headrest of the driver's seat.

The graph of FIG. 4 shows the measurement results of the frequency dependence of the sound pressure in the mobile speaker system of Example 1 and Comparative Example 1 as described above. The horizontal axis of FIG. 4 indicates the frequency (Hz) of the measured sound, the vertical axis indicates the sound pressure (dB), the solid line corresponds to Example 1, and the broken line corresponds to Comparative Example 1. The scale on the horizontal axis is logarithmic. According to this measurement result, the sound pressure in Example 1 was higher than that in Comparative Example 1 at about 30 Hz to 70 Hz, particularly about 15 Hz at around 60 Hz. Therefore, the result that the acoustic characteristics were improved in the low sound range by the sound radiated from the other end 4B of the pipe member 4 was obtained.

With the above configuration, the other end 4B of the pipe member 4 opens toward the corner C1 where three of the plurality of surfaces surrounding the vehicle interior space A1 intersect, so that the bass emitted from the other end 4B is 3 It is reflected by two surfaces and easily reverberates in the vehicle interior space A1, so that the acoustic characteristics of the low frequency range in the moving body speaker system 1A can be improved.

Further, when the speaker unit 2 emits sound so that the sound pressure in the mid-high range is higher than the sound pressure in the low range, the vibration of the speaker unit 2 can be reduced, and the vehicle body It is possible to suppress the generation of abnormal noise due to vibration. In addition, by improving the acoustic characteristics in the low frequency range as described above, even when the small speaker unit 2 having a low sound pressure in the low frequency range is used, good acoustic characteristics can be obtained. Further, since the sound pressure of the low sound emitted from the front surface of the speaker unit 2 is relatively low, the sound emitted from the front surface of the speaker unit 2 and the sound emitted from the other end 4B of the tube member 4 in the low sound range Are difficult to weaken each other.

In the moving body speaker system 1 A, middle to high frequency sounds are mainly emitted from the front surface of the speaker unit 2, and low frequency sounds are mainly emitted from the other end 4 B of the tube member 4. The optimal radiation position may differ between the mid-high range (for example, 1000 to 10000 Hz) and the low range (for example, 10 to 1000 Hz), but the mid-high range and the low range are radiated. Since the positions are separated from each other, they can be arranged at optimum positions, and extremely good acoustic characteristics can be obtained.

Further, when the other end 4B of the tube member 4 opens toward the corner C1, a standing wave is formed between the corner C1 and the opposite corner by the sound radiated from the other end 4B. At this time, the distance between the corner C1 and the opposite corner is longer than the distance between a pair of opposing surfaces (upper surface S1 and lower surface S2, front surface S3 and rear surface, pair of side surfaces S4). A long standing wave can be formed, and bass can be efficiently reflected in the interior space A1.

In addition, the speaker unit 2 and the enclosure 3 are provided in the instrument panel I, and the tube member 4 passes through the instrument panel I, so that the appearance of the mobile speaker system 1A is provided in the vehicle C. Can keep good.

<Example 2>
FIG. 5 is a side view showing a vehicle C provided with the moving body speaker system 1B according to the second embodiment of the present invention. FIG. 6 shows the moving body speaker system 1B according to the second embodiment and the comparative example 2. It is a graph which shows the frequency dependence of the sound pressure in the speaker system for moving bodies.

As shown in FIG. 5, the moving body speaker system 1 B includes a speaker unit 2, an enclosure 3, and a tube member 5.

The pipe member 5 has one end 5 A communicating with the internal space of the enclosure 3, and the other end 5 B disposed at the corner of the driver's seat (near the accelerator pedal). That is, the other end 5B is opened in the vicinity of the first intersection R1 where the front surface S3 and the lower surface S2 intersect. In addition, the opening direction of the other end 5B does not face the first intersecting portion R1, but is inclined slightly downward from the lower side. The other end 5B may be provided at a position close to the side surface S4 in the width direction, or may be provided at a separated position. In the front-rear direction, the tube member 5 extends from the one end 5A to the other end 5B once toward the front side, then returns to the rear side again, and curves convexly toward the front side when viewed from the width direction. It has a shape.

The following describes the progress and reflection of the sound radiated from the other end 5B of the tube member 5 in the moving body speaker system 1B. Similar to the first embodiment, a sound mainly composed of a low-frequency component is radiated from the other end 5B, reflected by the lower surface S2 near the first intersection R1, and directed toward the second intersection where the rear surface and the upper surface S1 intersect. And proceed. Furthermore, this sound is reflected at the second intersection and its surroundings and travels toward the first intersection R1. Thus, the standing wave of the wavelength according to the distance between a pair of crossing part by the sound wave which goes to the 2nd crossing part from the 1st crossing part R1, and the sound wave which goes to the 1st crossing part R1 from the 2nd crossing part Is formed.

Here, the acoustic characteristics of the moving body speaker system 1B of the second embodiment will be specifically described. First, in the moving body speaker system 1B of Example 2, the capacity of the enclosure 3 (volume of the internal space) was 1 L, the inner diameter of the tube member 5 was 32 mm, and the length of the tube member 5 was 700 mm. Then, in the moving body speaker system 1B, the other end 5B of the tube member 5 was closed so that almost no sound was radiated. For the moving body speaker systems of Example 2 and Comparative Example 2, the frequency dependence of sound pressure was measured in the vicinity of the headrest of the driver's seat.

The measurement result of the frequency dependence of the sound pressure in the mobile speaker system of Example 2 and Comparative Example 2 as described above is shown in the graph of FIG. The horizontal axis of FIG. 6 indicates the frequency (Hz) of the measured sound, the vertical axis indicates the sound pressure (dB), the solid line corresponds to Example 2, and the broken line corresponds to Comparative Example 2. The scale on the horizontal axis is logarithmic. According to this measurement result, in the vicinity of about 30 Hz to 100 Hz, the sound pressure of Example 2 was higher than that of Comparative Example 2, and was about 15 dB higher especially around 50 Hz. Therefore, the result that the acoustic characteristics were improved in the low sound range by the sound radiated from the other end 5B of the tube member 5 was obtained.

With the above configuration, the same effects as in the first embodiment can be obtained. Furthermore, when the other end 5B of the tube member 5 is opened in the vicinity of the first intersection R1, a standing wave is formed between the pair of intersections by the sound radiated from the other end 5B. At this time, the distance between the pair of intersecting portions is longer than the distance between the pair of opposing surfaces (upper surface S1 and lower surface S2, front surface S3 and rear surface, pair of side surfaces S4). It can be formed, and the bass can be efficiently reflected in the interior space A1.

In addition, this invention is not limited to the said Example, The other deformation | transformation etc. which can achieve the objective of this invention are included, and the following modifications etc. are also contained in this invention.

For example, in the first embodiment, the cross-sectional shape and the cross-sectional area of the pipe member 4 are substantially constant. However, in accordance with the internal structure of the instrument panel I, a first modification is shown in FIG. As described above, in the region in the vicinity of the other end in the longitudinal direction, the pipe member 6 having an enlarged inner diameter whose cross-sectional area is constant and whose cross-sectional shape changes is increased from one end 6A connected to the enclosure 3 toward the other end 6B. Also good. Specifically, as shown in the cross-sectional views along the AA ′ line, the BB ′ line, and the CC ′ line, the cross-sectional shape is substantially a perfect circle on the one end 6A side, and goes toward the other end 6B. Accordingly, the tube member 6 that becomes a flat ellipse (the major axis of the ellipse becomes longer) may be used. According to such a configuration, the acoustic characteristics of the sound radiated from the other end 6B of the tube member 6 can be improved. Further, the cross-sectional shape of the tube member may change as it goes to the other end over the entire length direction, for example, or the cross-sectional shape changes as it goes to the other end in the central region in the length direction. Also good.

Further, in the first embodiment, the enclosure 3 and the pipe member 4 serving as the accommodating part are separate members. However, as shown in FIG. 7B as a second modification, the accommodating part and the pipe member are used. Alternatively, a tubular housing portion 7 that is integrally formed with each other may be used. At this time, the tubular housing portion 7 has a portion whose inner diameter becomes smaller as it extends from the speaker unit 2 side to the other side. This portion becomes the housing portion 71, and the opposite side of the speaker unit 2 across the housing portion 71 is tubular. It becomes the pipe part 72 as a member. That is, one end of the pipe part 72 is provided continuously with the accommodating part 71.

In the first embodiment, the speaker unit 2 and the enclosure 3 are provided on the instrument panel I. However, the speaker unit 2 and the enclosure 3 may be provided at other locations.

For example, as shown in FIG. 8 as a third modification, the speaker unit 2 and the enclosure 3 may be a moving body speaker system 1C provided below the seat SH of the vehicle C. An air conditioning duct D is provided in the vehicle C provided with the moving body speaker system 1C. The air conditioning duct D extends from the air conditioner provided on the front side (for example, in the instrument panel) along the front-rear direction in order to send cold air or warm air to the feet of the rear seat. As shown to C), it has the tubular channel | path part D0. The passage portion D0 includes a first passage D1 through which cold air or hot air passes and a second passage D2 by being partitioned by the partition portion D3. The second passage D2 is provided, for example, for reinforcing the first passage D1.

The tube member 4 of the moving body speaker system 1C has one end 4A connected to the front surface of the enclosure 3 and extends toward the front side, is connected to the second passage D2, and the second passage D2 functions as a tube member and moves forward. It extends toward the side and is separated from the second passage D2 on the other end side, and opens toward the front intersection or corner. That is, a portion between one end 4A and the other end of the pipe member 4 is formed integrally with the air conditioning duct D. In addition, the 2nd channel | path is not formed in the air-conditioning duct D, It is good also as a structure by which a part of pipe member 4 was integrally formed with the 1st channel | path D1.

According to the moving body speaker system 1C of the third modified example, the air conditioning duct D is used as the pipe member 4 to reduce the cost, and the air conditioning duct D is formed in the vehicle C so as to pass through. Space can be used. Furthermore, even if the installation space of the speaker unit 2 below the seat SH is narrow, the other end of the tube member 4 is open toward the corner or the intersection so that acoustic characteristics such as sound pressure in the low frequency range can be obtained. Can be improved.

Further, as shown in FIG. 9A as a fourth modified example, the speaker unit 2 and the enclosure 3D are formed as a part of a glove box G as a box portion provided on the instrument panel I of the vehicle C. Alternatively, the moving body speaker system 1D may be used. On the instrument panel I of the vehicle C provided with the moving body speaker system 1D, there is a glove box G that opens and closes by rotating with a rotation axis along the width direction (illustrated by a two-dot chain line). Is provided. The space on the lower side of the glove box G is partitioned from the other portion G0 (a space in which an object can be stored), thereby forming an enclosure 3D. The speaker unit 2 is accommodated in the enclosure 3D so that the front surface thereof faces the outside of the glove box G and the front surface faces the front side and the lower side. One end 4A of the tube member 4 is connected to the lower side of the enclosure 3D, and the other end 4B is open toward the corner C1.

In addition, the other end 4B of the pipe member 4 may open toward the intersection where the front surface S3 and the lower surface S2 intersect. 9B, the front surface of the speaker unit 2 may face the rear side in the traveling direction of the vehicle C. Further, an enclosure 3D may be formed in an existing glove box G attached to the vehicle C to accommodate the speaker unit 2, or a glove box G in which a moving body speaker system 1D is provided in advance is produced. Also good. Moreover, it is good also as a structure which does not partition the glove box G, but the closed space or sealed space formed when the glove box G is closed functions as an enclosure.

According to the moving body speaker system 1D of the fourth modified example as described above, since the enclosure 3D is a part of the glove box G, the other end of the tube member 4 can be easily directed to the corner portion C1. Moreover, even if the speaker unit 2 is reduced in size in order to suppress the narrowing of the space in the glove box G, the other end 4B of the tube member 4 is opened toward the corner portion C1 or the intersection portion. Acoustic characteristics such as sound pressure in the range can be improved.

Further, as shown in FIG. 10 as a fifth modification, the speaker unit 2 and the enclosure 3E may be a moving body speaker system 1E provided in the wheel T1 of the spare tire T accommodated in the vehicle interior space A1. . The spare tire T is accommodated in a tire accommodating portion formed on the rear side in the traveling direction of the vehicle C, for example, and includes a wheel T1 and a tire T2. The wheel T1 is formed with a recess T0 on the surface facing the inner side in the width direction when being attached to the vehicle C and used. The inner peripheral surface of the concave portion T0 is formed in a cylindrical shape, and the enclosure 3E is formed in a cylindrical shape whose outer peripheral size is the same as or slightly smaller than the concave portion T0. The enclosure 3E is accommodated in the recess T0.

Further, the height of the enclosure 3E is larger than the depth of the recess T0, a part (lower part) of the enclosure 3E is accommodated in the recess T0, and the other part (upper part) protrudes from the recess T0. The entire enclosure 3E may be accommodated in the recess T0 in the vertical direction. One end 4A of two pipe members 4 is connected to the enclosure 3E. The other end 4B of the pipe member 4 is open toward the corner C2 where the side surface S4, the lower surface S2, and the rear surface of the vehicle C intersect, but faces the corner portion where the side surface S4 intersects the upper surface and the rear surface. May be opened, or may be opened toward an intersection where the rear surface and another surface (side surface S4, lower surface S2 or upper surface) intersect.

In addition, unevenness is formed on the surface of the lower surface S2 of the vehicle by reinforcing ribs RB extending in the front-rear direction or the width direction, and a flat cover portion may be provided on this surface. You may utilize the clearance gap formed between this unevenness | corrugation and a cover part as a pipe member.

According to the moving body speaker system 1E of the fifth modified example as described above, even if the speaker unit 2 is downsized to be accommodated in the recess T0 of the spare tire T, the other end 4B of the tube member 4 has the corner portion C2. Or by opening toward the intersection, it is possible to improve acoustic characteristics such as sound pressure in the low frequency range.

As a sixth modification, the speaker unit 2 and the enclosure 3F may be a mobile speaker system 1F provided at the center in the width direction of the vehicle C as shown in FIG. The speaker unit 2 and the enclosure 3F are provided between the two front seats SH and below, and one end 4A of two pipe members 4 is connected to the front surface of the enclosure 3F. One of the two pipe members 4 extends to the right side with respect to the traveling direction, and the other extends to the left side. That is, the two pipe members 4 extend toward opposite sides in the width direction. The other ends 4B of the two pipe members 4 are open toward the left and right corners C1, respectively.

In addition, the other end 4B of the pipe member 4 may open toward the intersection where the side surface S4 and the lower surface S2 of the vehicle C intersect. Further, as shown in FIG. 11B, two speaker units 2 are accommodated in the enclosure 3F, and one speaker unit 2 radiates sound to the front side, and the other speaker unit 2 radiates sound to the rear side. It is good also as composition to do. According to such a configuration, sounds emitted from the two speaker units 2 from the back side are weakened, and the enclosure 3 can be prevented from vibrating during sound emission.

According to the moving body speaker system 1F of the sixth modified example, the space between and below the two seats SH on the front side can be used. Moreover, even if the installation space in this space is narrow, the other end 4B of the pipe member 4 is open toward the corner C1 or the intersection, thereby improving acoustic characteristics such as sound pressure in the low frequency range. it can. Furthermore, the low sound radiated | emitted from the other end 4B of the pipe member 4 in both sides of the width direction reverberates, and it can be set as the reproduction sound which is powerful for a passenger. Propagation of the vibration of the speaker unit 2 itself into the vehicle C can be suppressed by connecting the back surfaces of the two speaker units 2.

Further, as shown in FIG. 12 as a seventh modified example, a speaker unit 2G for low sound reproduction and an enclosure 3G are provided on the rear side in the traveling direction of the vehicle C, and an upper surface S1 and a rear surface S5 of the vehicle C are provided. It is good also as the speaker system 1G for moving bodies which is provided in the crossing part CR1 vicinity which cross | intersects and the pipe member 4 passes the inner side of the side sill SS of the vehicle C, and extends toward the front corner | angular part C1. The enclosure 3G is provided at the center in the width direction and behind the headrest of the seat SH on the rear side. The speaker unit 2G is accommodated with the front surface facing upward, and one end 4A of the tube member 4 is connected to the lower surface of the enclosure 3G. ing. The tube member 4 extends downward from the lower surface of the speaker unit 2G and toward one side surface of the vehicle C, passes through the inside of the side sill SS extending in the front-rear direction below the door body of the vehicle C, and extends toward the front side. . Furthermore, the tube member 4 is further forward on the front side than the side sill SS, then once on the upper side and then on the lower side, so that the other end 4B opens toward the corner C1.

The sound radiated from the speaker unit 2G goes to the intersection CR1, and the sound radiated from the other end of the tube member 4 goes to the corner C1. The enclosure may be arranged on either the left or right side in the width direction, and the sound radiated from the speaker unit may be directed to the corner where the upper surface S1, the side surface S4, and the rear surface S5 intersect. Moreover, the other end 4B of the pipe member 4 should just open toward the crossing part ahead of the side sill SS, and may face the crossing part where the front surface S3 and the lower surface S2 cross each other, or the side surface S4. It may face the intersection where the portion on the front side of the side sill SS and the lower surface S2 intersect.

According to the moving body speaker system 1G of the seventh modified example, the bass radiated from the speaker unit 2G and the other end 4B of the tube member 4 is reflected at the front and rear corners or intersections, Acoustic characteristics such as sound pressure can be further improved.

Also, the frequency dependence of the sound radiated from the speaker unit may be set appropriately. Even if the sound pressure in the low frequency range radiated from the front side of the speaker unit is high, the sound from the front side and the sound from the other side can be resonated if the low sound pressure radiated from the other end by resonating with the tube member is sufficiently high. Even if the sound weakens, it is possible to secure a low sound pressure. In other words, if the sound pressure of the bass is sufficiently improved due to resonance in the tube member, the speaker unit that emits sound so that the sound pressure is the same level from the low range to the mid-high range, or the sound pressure of the low range A speaker unit that emits sound may be used so as to be higher than the sound pressure in the mid-high range, or a mid-high range speaker unit (tweeter) may be used. The shape of the speaker unit is not particularly limited, and may be a cone type or a dome shape.

In the first embodiment, sound is emitted from the front side of the speaker unit 2 on the upper surface of the instrument panel I. However, the speaker unit is, for example, the rear surface of the instrument panel I (the surface facing the driver's seat). In this case, sound may be emitted from the front side. Moreover, although the speaker unit 2 shall be provided in the instrument panel I, it is good also as a structure by which a speaker unit is provided in the outer side of the instrument panel I (for example, it mounts on the upper surface of the instrument panel I). At this time, the pipe member may be provided along the outside without passing through the inside of the instrument panel I. According to such a structure, when installing the speaker system for mobile bodies by retrofit with respect to a vehicle, installation work can be implemented easily.

In the first embodiment, the other end 4B of the pipe member 4 is opened toward the corner C1 where the front surface S3, the lower surface S2, and the side surface S4 on the driver's seat intersect. Corner portions (corner portions C1 to C3 shown in FIG. 3) where any three of a plurality of surfaces (inner surface, upper surface S1, lower surface S2, front surface S3, pair of side surfaces S4, rear surface) of space shield A1 intersect. It just needs to be open facing. Further, the other end of the tube member may be open toward an intersection (R1 to R8 shown in FIG. 3) where two of the plurality of surfaces intersect, or open so as to face one surface. Or may be along a surface.

The corner portion C1 is a corner portion where the front surface S3, the lower surface S2 and the side surface S4 of the vehicle C intersect, and the corner portion C2 is a corner portion where the rear surface S5, the lower surface S2 and the side surface S4 of the vehicle C intersect. The corner C3 is a corner where the rear surface S5, the upper surface S1, and the side surface S4 of the vehicle C intersect. The intersection R1 is an intersection where the front surface S3 and the lower surface S2 of the vehicle C intersect, and the intersection R2 is an intersection where the lower surface S2 and the side surface S4 of the vehicle C intersect, and the intersection R3 is The intersection portion R4 intersects the front surface S3 and the side surface S4 of the vehicle C, the intersection portion R4 intersects the rear surface S5 of the vehicle C and the lower surface S2, and the intersection portion R5 is the rear surface S5 of the vehicle C. And the side S4 intersect, the intersection R6 is the intersection where the front surface S3 and the upper surface S1 of the vehicle C intersect, and the intersection R7 intersects the upper surface S1 and the side S4 of the vehicle C. The intersection R8 is an intersection where the rear surface S5 of the vehicle C and the upper surface S1 intersect.

In the first and second embodiments, the standing wave is formed between the pair of corners or the pair of intersections by the sound radiated from the other ends 4B and 5B. For example, the other end may be opened in such a direction that a standing wave is formed between the front surface and the rear surface of the moving body, between a pair of side surfaces, and between the lower surface and the upper surface.

Further, in the first embodiment, the vehicle C is provided with one moving body speaker system 1A. However, a combination of a pair of moving body speaker systems in which the other ends of the tube members are opposed to each other is combined. May be. For example, the moving body speaker system in which the other end of the tube member is provided at the opposite corner may be combined with the moving body speaker system 1A of the first embodiment. At this time, the other end is moved so that the position of the node of the standing wave formed by the one moving body speaker system and the position of the node of the standing wave formed by the other moving body speaker system are shifted. It is preferable to arrange. Furthermore, it is more preferable to arrange the other end so that the position of the node of one standing wave and the position of the antinode of the other standing wave substantially coincide. According to such a configuration, the position dependency of the sound pressure in the vehicle interior space A1 can be reduced by shifting the nodes of the two standing waves or by substantially matching the nodes and the belly.

In addition, the best configuration and method for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the present invention has been illustrated and described primarily with respect to particular embodiments, but is not limited to the embodiments described above without departing from the scope and spirit of the present invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

1A-1G Speaker system for moving body 2

Speaker unit

3, 3D-3G Enclosure (container)
4 Pipe member 4A One end 4B The other end C1 Corner A1 Car interior space (space)
C Vehicle (moving body)
S2 Lower surface S3 Front surface S4 Side surface I Instrument panel CR1 Intersection D Air conditioning duct G Glove box (box)
T spare tire T0 recess SS side sill

Claims

A speaker unit that emits sound from the front toward the box-shaped space formed by the moving body;
An accommodating portion for accommodating a rear surface of the speaker unit;
A pipe member having one end communicating with the internal space of the housing portion,
The other end of the tube member opens toward a crossing portion where at least two of a plurality of surfaces surrounding the space intersect.
2. The mobile speaker system according to claim 1, wherein the other end of the tube member opens toward a corner where three of the plurality of surfaces intersect.
The speaker system for a moving body according to claim 1, wherein the speaker unit emits a sound so that a sound pressure in a middle / high range is higher than a sound pressure in a low range.
The speaker unit is provided in the instrument panel so as to emit sound from the front side on the upper surface of the instrument panel of the moving body,
The other end of the pipe member opens below the instrument panel and faces the corner where the front surface, the lower surface, and the side surface of the plurality of surfaces of the movable body intersect in the traveling direction of the movable body. The speaker system for a moving body according to claim 2, wherein:
The speaker unit and the accommodating portion are provided in the instrument panel,
The said pipe member passes through the said instrument panel, The speaker system for moving bodies of Claim 4 characterized by the above-mentioned.
2. The mobile speaker system according to claim 1, wherein a cross-sectional shape of the tube member changes toward the other end in at least one region in the longitudinal direction.
The speaker unit and the accommodating portion are provided below a seat of the movable body,
The mobile speaker system according to claim 1, wherein a part of the tube member is integrated with an air conditioning duct of the mobile body and extends toward a front side in a traveling direction of the mobile body. .
The accommodating portion is a part of a box portion provided in an instrument panel of the moving body,
The front surface of the speaker unit is directed to the outside of the box portion,
2. The mobile speaker system according to claim 1, wherein the other end of the tube member opens toward an intersection where a front surface and a lower surface intersect in the traveling direction of the mobile body.
The speaker system for a moving body according to claim 1, wherein the speaker unit and the housing portion are provided in a wheel of a spare tire housed in a box-shaped space formed by the moving body.
The speaker unit and the accommodating portion are provided in a central portion in the width direction of the movable body,
Two pipe members are connected to the accommodating portion,
The two pipe members extend toward opposite sides in the width direction, and the other ends open toward the intersection where the side surface of the movable body and at least one other surface intersect. The mobile speaker system according to claim 1.
The speaker unit and the housing portion are provided in the vicinity of the intersecting portion on the rear side in the traveling direction of the moving body,
The pipe member passes through the inside of the side sill of the movable body, and the other end is open toward the intersection portion on the front side of the side sill in the traveling direction. The speaker system for moving bodies as described.
A moving body comprising the speaker system for a moving body according to claim 1.