JP2021175093A - Speaker device - Google Patents

Abstract

To improve the absorption efficiency of sound waves radiated from the back of a speaker unit such that faithful sound can be reproduced from the speaker unit as much as possible.SOLUTION: A speaker device includes an enclosure 1, a speaker unit 10, and a sound absorbing member, and includes a tower-shaped body 20 having a base end attached to the enclosure 1 and having a tapered tip as the sound absorbing member, and the tower-shaped body 20 is divided into a plurality of parts along the axis P connecting the base end and the tip end, and the side surface 21 of each of the divided bodies T (T1, T2, ..., and Tn) is formed on an inclined surface that spreads toward the base end side from the tip end side. Further, as the sound absorbing member, in addition to the tower-shaped body 20, a porous filler 30 to be filled in an internal space e is provided, and the density of the filler 30 is set to increase as the distance from the speaker unit increases.SELECTED DRAWING: Figure 5

Description

The present invention relates to a speaker device in which a speaker unit is attached to a box-shaped enclosure, and more particularly to a speaker device having a sound absorbing member in an internal space of the enclosure.

Conventionally, as a speaker device of this type, for example, a technique described in Japanese Patent Application Laid-Open No. 62-208798 (Patent Document 1) is known. As shown in FIG. 20, the speaker device Sa includes a box-shaped enclosure 100 having an internal space e surrounded by an inner wall surface, a speaker unit 101 attached to one end surface of the enclosure 100, and an internal space of the enclosure 100. It is configured to include a sound absorbing member provided in e. The sound absorbing member is composed of a conical tower-like body 102 whose base end is attached to the other end surface of the enclosure 100 and whose tip is tapered. The enclosure 100 and the tower-shaped body 102 of the apparatus Sa are long and large in size exceeding 2 m. Then, the cross-sectional area of the internal space e of the enclosure 100 is gradually narrowed from one end surface to the other end surface of the speaker unit 101 by the conical tower-shaped body 102, and from the back surface of the speaker unit 101. The radiated sound wave is absorbed by filling it with a sound absorbing material having a shape so that the acoustic impedance does not change suddenly, so that the sound wave radiated from the front surface of the speaker unit 101 is not affected by resonance or attenuation.

Further, as a conventional speaker device, for example, the technique described in Japanese Patent Application Laid-Open No. 2001-524287 (Patent Document 2) is also known. As shown in FIG. 21, the speaker device Sb includes an enclosure 110 having an internal space e and a speaker unit 111. The enclosure 110 is acoustically connected to the hollow resonance main body 112 that supports the speaker unit 111 and the rear portion of the speaker unit 111 of the main body 112, and is a tube 113 for deflecting and absorbing sound waves generated at the rear portion of the speaker unit 111. It is configured with and. Inside the enclosure 110, for example, a filler 114 as a sound absorbing member made of glass fiber is provided. The speaker unit 111 is attenuated by the filler 114 so as to reduce the resonance of the main body 112 and the tube 113 of the enclosure 110, and the higher-order resonance of the main body 112 cancels the higher-order resonance of the tube 113. The sound waves emitted from the back of the enclosure do not affect the sound waves emitted from the front, such as resonance and attenuation.

Japanese Unexamined Patent Publication No. 62-20798 Special Table 2001-524287

By the way, in the conventional speaker device Sa shown in FIG. 20, the cross-sectional area of the internal space e of the enclosure 100 is gradually narrowed by the conical tower-shaped body 102, that is, the acoustic impedance does not change substantially suddenly. A sound absorbing member made of such a conical tower-shaped body 102 is provided to absorb sound waves, but it is large because it requires a long enclosure 100 having a sound path of more than 2 m and a large tower-shaped body 102. It is not practical, and even if it is large, it cannot always be said that the absorption efficiency of radiated sound waves is excellent from the back surface.

On the other hand, in the conventional speaker device Sb shown in FIG. 21, due to the simple resonance structure and the simple sound absorbing member configuration, the sound waves emitted from the back surface of the speaker unit 111 are affected by the resonance and attenuation of the sound waves emitted from the front surface. The effect on the sound wave band and the sound absorption characteristics are limited because the sound wave is not given. Therefore, as described in Patent Document 2, a multi-speaker system in which a large number of speaker units are combined is required, and it becomes difficult to achieve phase consistency between the speaker units, which is practical. It cannot be said that the sound quality is excellent.

The present invention has been made in view of these points, and is a speaker device in which the absorption efficiency of sound waves radiated from the back surface of the speaker unit is improved and the faithful sound can be reproduced from the speaker unit as much as possible. The purpose is to provide.

The speaker device of the present invention for achieving such an object is formed on a box-shaped enclosure having an internal space surrounded by an inner wall surface and a wall portion forming a baffle surface composed of one surface of the inner wall surface of the enclosure. A speaker device including a speaker unit to be attached and a sound absorbing member provided in the internal space of the enclosure, and as the sound absorbing member, a speaker device having a tower-like body having a base end attached to the inner wall surface of the enclosure and formed with a tapered tip. In
As the sound absorbing member, in addition to the tower-shaped body, a fibrous or porous filler to be filled in the internal space is provided, and the density of the filler is set to be increased as the distance from the speaker unit increases. ..

The material of the enclosure can be, for example, a wood-based material, a synthetic resin material, a metal material, a ceramic material, a composite material thereof, or the like. Further, the material of the tower-like body can be composed of, for example, a wood-based material, a synthetic resin material, a rubber-based material, a metal material, a ceramic material, a composite material thereof, a porous material, or the like. The tower-shaped body may be provided on any inner wall surface of the enclosure. Further, a plurality of tower-shaped bodies may be provided.

Filler materials include, for example, glass wool, felt, natural fibers such as cotton and wool, chemical fibers such as polyester, polypropylene, acetate and polyamide (nylon), foam materials such as polymers and rubber such as melamine and urethane, and lead. It can be made of wool, aluminum metal foil, rubber, polymer sheet material, non-woven fabric, etc. In addition, these materials can be used in combination as appropriate.

As a result, since the tower-like body is formed with a tapered tip, the cross-sectional area of the internal space of the enclosure can be changed, so that the back surface is formed in a shape so that the acoustic impedance does not substantially change suddenly. Sound waves radiated from can be guided to the end of the enclosure. Further, since the internal space is filled with a fibrous or porous filler, the energy of sound waves can be absorbed by this filler as well. Moreover, since the density of the filler is set higher as the distance from the speaker unit increases, a density gradient structure is formed in which the impedance of the filler with respect to sound waves gradually changes, so that reflection of sound waves is suppressed and the filler is guided to the end. In the meantime, it changes to heat and absorbs sound. Therefore, in addition to the function of forming a shape that does not cause a sudden change in the acoustic impedance of the tower-like body and guiding it to the end of the enclosure, the sound absorption function of the filler works synergistically, so that the sound wave absorption efficiency can be improved. It will be possible to reproduce the faithful sound from the speaker unit as much as possible.

In addition, as a basic design concept of the conventional speaker system, a design method is adopted in which the filling amount of the filler is reduced as much as possible because the sound pressure in the bass range is reduced when a large amount of filler is filled inside the enclosure. However, according to the present invention, by providing a filler in addition to the tower-shaped body, the filling amount can be reduced and the original acoustic characteristics possessed by the speaker unit can be maximized. ..

Further, the speaker device of the present invention for achieving the above object has a box-shaped enclosure having an internal space surrounded by an inner wall surface and a wall portion forming a baffle surface composed of one surface of the inner wall surface of the enclosure. A speaker device including a speaker unit to be attached and a sound absorbing member provided in the internal space of the enclosure, and as the sound absorbing member, a speaker device having a tower-like body having a base end attached to the inner wall surface of the enclosure and formed with a tapered tip. In
The tower-shaped body is divided into a plurality of parts along an axis connecting the base end and the tip end, and the side surfaces of the plurality of divided bodies formed by the division are each spread toward the base end side from the tip end side. It is formed on an inclined surface, and the tower-like body is configured by connecting the plurality of divided bodies in the axial direction.

As described above, the material of the enclosure can be, for example, a wood-based material, a synthetic resin material, a metal material, a ceramic material, a composite material thereof, or the like. Further, as the material of the tower-like body, as described above, for example, it may be composed of a wood-based material, a synthetic resin material, a rubber-based material, a metal material, a ceramic material, a composite material thereof, a porous material, or the like. can. The tower-shaped body may be provided on any inner wall surface of the enclosure. Further, a plurality of tower-shaped bodies may be provided.

As a result, the tower-like body is formed with a tapered tip, and the tower-like body is divided, and each divided body has a side surface formed on an inclined surface, so that the tower-like body is compared with a conventional flat tower-like body. As a result, the sound absorption effect is diversified over a wide range of sound wave frequency bands from high to low, so that the absorption efficiency can be further improved and the faithful sound can be reproduced from the speaker unit. Become.

Then, if necessary, the shape and / or size of each divided body is made different. In order to make the shapes different, for example, the shape of each divided body can be realized by selecting an appropriate combination such as a conical shape, a conical trapezoid, a polygonal trapezoid, and a polygonal trapezoid. The different sizes can be realized, for example, by changing the height dimension of each divided body and the maximum length of the bottom surface.
As a result, it is possible to make it difficult to generate a resonance sound having a constant frequency in each of the divided bodies, and it is possible to further improve the absorption efficiency.

Further, if necessary, the bottom surface of some or all of the plurality of divided bodies is recessed, and the bottom surface of the recessed divided body and the tip portion of the lower divided body adjacent thereto are recessed. It has a structure in which a recess is formed between the two.
As a result, a pocket consisting of a recess is formed on the back side of the divided body, and since sound waves enter this pocket, a sound absorbing action is generated in a wide frequency band from bass to treble, and the absorption efficiency is further improved. This makes it possible to reproduce more faithful sound from the speaker unit.

In this case, it is effective that the surface of the bottom surface is formed as an inclined surface that spreads toward the base end side from the tip end side and has an angle different from the inclined surface of the side surface. Each of the divided bodies has a structure having a changed thickness. Therefore, it is possible to make it difficult for each divided body to generate a resonance sound having a constant frequency, and further improve the absorption efficiency. be able to.

Further, if necessary, three or more divided bodies are provided, and an insertion hole through which a rod can be inserted is formed in the divided body between the divided body at the tip end and the divided body at the base end along the axis thereof, and each divided body is formed. The rod is inserted into the insertion hole in a state where the rods are continuously provided, one end of the rod is fastened to the split body at the tip, and the other end of the rod is fastened to the split body at the base end. The split body between the split body at the end is held by the split body at the tip and the split body at the base end.

In this case, an insertion hole may be formed in the split body at the tip and / or the split body at the base end, and a rod may be inserted through the insertion hole to fix the rod. Fastening can be performed by forming a male screw on the rod and screwing a nut into it. As a result, the divided bodies can be aggregated by a rod to form a tower-shaped body, so that the tower-shaped body can be easily created.

Further, in this case, it is effective to provide three or more of the above-mentioned divided bodies and to connect the adjacent divided bodies on the distal end side and the divided bodies on the proximal end side in succession via an elastic member. The elastic member may be an adhesive.
As a result, since the elastic member is interposed between the divided bodies, it is possible to prevent the generation of the vibration sound peculiar to each divided body. It is possible to prevent the generation of a vibration sound peculiar to the whole structure, and it is possible to increase the sound absorbing action accordingly. The sound absorption effect can be exhibited in a wider frequency band.

Further, if necessary, in addition to the tower-shaped body, a fibrous or porous attachment body facing below the bottom surface of the split body is used as the sound absorbing member, and the attachment body is used as the sound absorbing member of the plurality of split bodies. Of these, some of the divided bodies or all of the divided bodies are provided with each.

Materials of the attachment include, for example, glass wool, felt, natural fibers such as cotton and wool, chemical fibers such as polyester, polypropylene, acetate and polyamide (nylon), foam materials such as polymers and rubber such as melamine and urethane, and lead. It can be made of wool, aluminum metal foil, rubber, polymer sheet material, non-woven fabric, etc. In addition, these materials can be used in combination as appropriate.

As a result, vibration absorption can be performed by the attached body together with the divided body constituting the tower-like body, and sound can be absorbed by the sound absorbing effect, so that the absorption efficiency can be further improved.

In this case, three or more divided bodies are provided, the attached body is formed in a mat shape, the central portion thereof is interposed between the adjacent divided bodies, and the periphery of the central portion is divided above the adjacent divided bodies. It is effective to face it below the bottom of the body.
As a result, the central portion of the mat-shaped attachment body is interposed between the divided bodies, so that the vibration of the divided bodies is absorbed, and therefore, the generation of the vibration sound peculiar to each divided body is prevented. Can be done. It is possible to prevent the generation of a vibration sound peculiar to the whole structure, and it is possible to increase the sound absorbing action accordingly.

Further, in this case, it is effective that a plurality of the attachments are provided corresponding to two or more of the plurality of divisions, and the density of each attachment is set higher as the distance from the speaker unit increases. ..
As a result, the sound absorbing effect can be exhibited in a wide frequency band, and the performance can be further improved.

Further, as necessary, in addition to the tower-like body, a fibrous or porous filler to be filled in the internal space is provided as the sound absorbing member, and the density of the filler is kept away from the speaker unit. The configuration is set larger according to.

As described above, as the material of the filler, for example, natural fibers such as glass wool, felt, cotton and wool, chemical fibers such as polyester, polypropylene, acetate and polyamide (nylon), polymers such as melamine and urethane, and rubber. It can be composed of foam materials such as, lead and aluminum metal foils, rubber, polymer sheet materials, non-woven fabrics, and the like. Further, these materials can be appropriately combined and used, and the density of the filler can be set higher as the distance from the speaker unit increases.

As a result, as described above, since the tower-like body is formed with a tapered tip, the cross-sectional area of the internal space of the enclosure can be changed, so that the acoustic impedance does not change substantially suddenly. It can form a shape and guide sound waves radiated from the back to the end of the enclosure. In this case, the tower is divided and each divided has a side surface formed on an inclined surface, so that the frequency band of sound waves from treble to bass is wider than that of a flat tower. Since the sound absorption effect is diversified, the absorption efficiency can be further improved, and the faithful sound can be reproduced from the speaker unit. Further, since the internal space is filled with a fibrous or porous filler, the energy of sound waves can be absorbed by this filler as well. Moreover, since the density of the filler is set higher as the distance from the speaker unit increases, a density gradient structure is formed in which the impedance of the filler with respect to sound waves gradually changes, so that reflection of sound waves is suppressed and the filler is guided to the end. In the meantime, it changes to heat and absorbs sound. Therefore, in addition to the function of forming a shape that does not cause a sudden change in the acoustic impedance of the tower-like body and guiding it to the end of the enclosure, the sound absorption function of the filler works synergistically, so that the sound wave absorption efficiency can be improved. It will be possible to reproduce the faithful sound from the speaker unit as much as possible.

In addition, as a basic design concept of the conventional speaker system, a design method is adopted in which the filling amount of the filler is reduced as much as possible because the sound pressure in the bass range is reduced when a large amount of filler is filled inside the enclosure. However, according to the present invention, by providing a filler in addition to the tower-shaped body, the filling amount can be reduced and the original acoustic characteristics possessed by the speaker unit can be maximized. ..

More specifically, a plurality of the attachments are provided corresponding to two or more of the plurality of divisions, and the density of each attachment is set higher as the distance from the speaker unit increases.
As the sound absorbing member, in addition to the tower-shaped body, a fibrous or porous filler to be filled in the internal space is provided, and the density of the filler is set higher as the distance from the speaker unit increases.
The sound absorption state inside the enclosure is configured so that the pink noise attenuation intensity is -30 db or less at 500 Hz and -50 db or less at 5000 Hz.

Further, if necessary, the inner wall surface of the enclosure is provided with a baffle surface on which the speaker unit is provided, a facing surface facing the baffle surface, and a cylindrical peripheral surface connected to the facing surface and the baffle surface. The internal space surrounded by the inner wall surface is formed into a polyhedron so that the contour line of the peripheral surface viewed from a plane orthogonal to the axis of the peripheral surface has an odd polygonal shape. It has a formed structure.

As a result, since the peripheral surfaces do not face each other in parallel, it is possible to prevent the generation of a standing wave of sound. That is, the above-mentioned sound absorbing effect and the standing wave reducing effect can synergize to absorb the back sound wave of the speaker unit to the maximum. Therefore, the absorption efficiency can be further improved, and the faithful sound with the same phase can be reproduced from the speaker unit. In particular, you can get the feeling of listening to the clear, raw sound that gives you the illusion of being at the recording site.

In this case, the baffle surface and the facing surface are mirror-symmetrical to each other and formed into a polygonal shape corresponding to the polygonal shape of the peripheral surface, the tower-like body is provided on the facing surface, and the baffle surface and the facing surface are provided with each other. When the distance is L and the height of the tower-like body is H, it is effective to set 0.3L ≦ H ≦ L. The sound absorbing effect of the tower-like body and the standing wave reducing effect can be synergistically and surely exerted. The baffle surface is suppressed to less than twice the area of the speaker unit, and the enclosure becomes horizontally long by that amount, so that the height of the tower can be sufficiently taken. A structure in which the density increases from the low density on the side to the end on the back side can be achieved more effectively.

According to the present invention, it is possible to improve the absorption efficiency of sound waves radiated from the back surface of the speaker unit, and to reproduce as much as possible faithful phase-aligned sound from the speaker unit. That is, the enclosure sufficiently absorbs the sound waves of the opposite phase on the back surface of the speaker diaphragm to eliminate incidental sounds as much as possible without affecting resonance or attenuation, and a wide range from bass to treble so as not to affect the front sound waves. The phase of the sound range can be aligned. Further, the baffle area can be minimized to obtain a point sound source as close as possible. Specifically, it was possible to achieve an approximate point sound source in which the baffle surface was suppressed to less than twice the speaker unit area, and the sound absorption effect inside the enclosure was excellent, and a synergistic effect that faithful to the waveform without turbidity could be reproduced. Therefore, it is possible to obtain a compact speaker system that enables the reproduction of the original sound with the same phase in a wide range of sounds, and gives a sense of reality that the performer and the singer actually exist and the large orchestra spreads in front of the front, back, left and right eyes. .. Further, even a small speaker can be listened to at a close distance of 50 to 90 cm from now on. By contributing to the effect, it is possible to listen to music with a sense of reality and presence that is comparable to that of a large speaker system even in a narrow space such as 4 and a half tatami mats at a sufficient volume without giving much consideration to the neighborhood. Of course, even if you listen to it in an audio room with a large space of more than 20 tatami mats, you can listen to music with a sense of reality and presence that is more than comparable to a conventional large system.

It is a partially cutaway perspective view which shows the speaker apparatus which concerns on 1st Embodiment of this invention. It is a front view which shows the structure of the enclosure main body of the speaker apparatus which concerns on 1st Embodiment of this invention. It is a side sectional view which shows the speaker apparatus which concerns on 1st Embodiment of this invention. It is a partially cutaway perspective view which shows the speaker apparatus which concerns on 2nd Embodiment of this invention. It is a side sectional view which shows the speaker apparatus which concerns on 2nd Embodiment of this invention. It is an exploded perspective view which shows the structure of the tower-like body of the speaker apparatus which concerns on 2nd Embodiment of this invention. It is a side sectional view which shows the tower-like body of the speaker apparatus which concerns on 2nd Embodiment of this invention. It is a side sectional view which shows the speaker apparatus which concerns on 3rd Embodiment of this invention. It is a side sectional view which shows the speaker apparatus which concerns on 4th Embodiment of this invention. It is a side sectional view which shows the speaker apparatus which concerns on 5th Embodiment of this invention. It is a figure which shows the attachment body used for the speaker apparatus which concerns on 5th Embodiment of this invention. It is a side sectional view which shows the speaker apparatus which concerns on 6th Embodiment of this invention. It is a side sectional view which shows the speaker apparatus which concerns on another Embodiment of this invention, (a) is the speaker apparatus which concerns on 7th Embodiment of this invention, (b) is 8th Embodiment of this invention. The speaker device according to the embodiment, (c) is the speaker device according to the ninth embodiment of the present invention, (d) is the speaker device according to the tenth embodiment of the present invention, and (e) is the first aspect of the present invention. The speaker apparatus which concerns on the 11th Embodiment is shown. It is a figure which shows the modification (a) (b) of the tower-like body in the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the modification of the connection of the divided body in the speaker apparatus which concerns on embodiment of this invention. It is a figure which shows the main body of another enclosure in the speaker apparatus which concerns on embodiment of this invention, (a) is a front view, (b) is a side view. Examples and comparative examples of the present invention are shown together with these sound absorption performance test results (relationship graph between frequency and pink noise attenuation intensity), and (a) is a cross-sectional view of the comparative example and a table showing the sound absorption performance test results. (B) is a cross-sectional view of Example 1 and a table view showing the sound absorption performance test result thereof. Examples of the present invention are shown together with the sound absorption performance test results (relationship graph between frequency and pink noise attenuation intensity), (a) is a cross-sectional view of Example 2 and a table diagram showing the sound absorption performance test results, (b). Is a cross-sectional view of Example 3 and a table showing the results of a sound absorption performance test thereof. It is a cross-sectional view of Example 4 of this invention and the table figure which shows the sound absorption performance test result (relationship graph of a frequency and a pink noise attenuation intensity). It is a side sectional view which shows an example of the conventional speaker apparatus. It is a side sectional view which shows another example of the conventional speaker apparatus.

Hereinafter, the speaker device according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 3 show the speaker device S according to the first embodiment of the present invention. The basic configuration of the speaker device S is a wall forming an internal space e and a box-shaped enclosure 1 in which the inner wall surface 2 is formed into a polyhedron and a baffle surface 3 composed of one surface of the inner wall surface 2 of the enclosure 1. A speaker unit 10 attached to the unit and a sound absorbing member provided in the internal space e of the enclosure 1 are provided.

The enclosure 1 is composed of, for example, a wood-based material, a synthetic resin material, a metal material, a ceramic material, and a composite material thereof, and in the embodiment, it is formed of a wood-based material such as wood, laminated wood of wood, or plywood. ing. The enclosure 1 closes the cylindrical main body 4, the front plate 5 which is attached to the front end of the main body 4 and constitutes a wall portion to which the speaker unit 10 is attached, and the rear end opening of the main body 4. It is composed of a rear surface plate 6 attached to the rear end. As shown in FIG. 2, the tubular main body 4 is formed by joining seven plate single units 4a having a trapezoidal cross section long in the axial direction, and the enclosure 1 is formed in a polygonal shape when viewed from the front. , In the embodiment, it is formed in a regular heptagon.

As a result, the inner wall surface 2 of the enclosure 1 has a baffle surface 3 composed of a front plate 5 on which the speaker unit 10 is provided, a facing surface 7 composed of a rear surface plate 6 and facing the baffle surface 3, the facing surface 7, and the facing surface 7. It is configured to include a cylindrical peripheral surface 8 connected to the baffle surface 3. The internal space e surrounded by the inner wall surface 2 is formed into a polyhedron, and as shown in FIG. 2, the peripheral surface 8 has a contour line seen from a plane (front surface of the enclosure 1) orthogonal to the axis P of the peripheral surface 8. It is formed to have an odd polygonal shape, and in the embodiment, it is formed into a regular heptagon. The baffle surface 3 and the facing surface 7 are mirror-symmetrical to each other and are formed into a polygonal shape corresponding to the polygonal shape of the peripheral surface 8, and in the embodiment, are formed into a regular heptagon.

The size of the internal space e of the enclosure 1 may be appropriately determined. For example, when a speaker unit having a diameter of 50 mm to 80 mm is used, the dimension R between the axis and the apex angle is set to R when viewed from the front. = 30 mm to 50 mm, and the distance L between the baffle surface 3 and the facing surface 7, which is the length in the direction along the axis P when viewed from the side surface, is set to L = 200 mm to 300 mm. Although not specified in this dimension, a larger speaker unit having a diameter of 10 cm to 20 cm can be used.

The speaker unit 10 can output various sounds that can be recognized by human hearing, such as music and electronic sounds, by using an acoustic drive device such as an amplifier (not shown), and has a cone type, a dome type, a horn type, and the like. You can select from ribbon type, flat type, etc. In the embodiment, the speaker unit 10 is of a special flat type, and is provided at the flat diaphragm 11, the frame 12 to which the opening edge of the diaphragm 11 is attached, and the base end portion of the frame 12. It is configured to include a yoke 13. Reference numeral 14 in FIG. 3 is a wiring of the speaker unit 10 drawn through the internal space e, and reference numeral 15 is a connection terminal to which this wiring is connected and provided on the rear surface plate 6. Even if a well-known cone-shaped speaker unit is used as appropriate, it can be handled in exactly the same manner.

The sound absorbing member is a tower-shaped body 20 whose base end is attached to the inner wall surface 2 of the enclosure 1 and is formed with a tapered tip, and a fibrous or porous body provided in addition to the tower-shaped body 20 and filled in the internal space e. It is configured to include a filler 30.

Specifically, the tower-shaped body 20 is composed of, for example, a wood-based material, a synthetic resin material, a rubber-based material, a metal material, a ceramic material, a composite material thereof, a porous material, or the like. It is made of wood-based materials such as laminated wood and plywood. The tower-shaped body 20 is formed in a weight shape formed of a cone or a polygonal weight. In the embodiment, it is formed in a cone.

In the embodiment, as described above, the distance L between the baffle surface 3 and the facing surface 7 is set to L = 200 mm to 300 mm, but the height H of the tower-shaped body 20 is 0.3 L ≦ H ≦. L, for example, H = 150 mm to 250 mm is set.

The filler 30 is, for example, glass wool, felt, natural fibers such as cotton and wool, chemical fibers such as polyester, polypropylene, acetate and polyamide (nylon), foam materials such as polymers and rubber such as melamine and urethane, and lead and aluminum. It is composed of metal foil, rubber, sheet material such as polymer, non-woven fabric, etc. The filler 30 is provided by filling the speaker unit 10 from the lower surface of the yoke 13 to the facing surface 7, and the density of the filler 30 is set higher as the distance from the speaker unit 10 increases. In the embodiment, the half of the speaker unit 10 side is made of polyester fiber (low density sound absorbing material) and polypropylene fiber (medium density sound absorbing material), and the half of the facing surface 7 side is made of felt (high density sound absorbing material). Moreover, the densities of the polyester fibers (low-density sound-absorbing material), polypropylene fibers (medium-density sound-absorbing material), and felt (high-density sound-absorbing material) are set higher as the distance from the speaker unit 10 increases.

Therefore, according to the speaker device S according to this embodiment, since the tower-shaped body 20 is formed with a tapered tip, the cross-sectional area of the internal space e of the enclosure 1 can be changed, whereby the speaker It is possible to form a shape in which the acoustic impedance does not substantially change suddenly with respect to the sound wave radiated from the back surface of the unit 10 and to guide and absorb the sound wave to the end of the enclosure without reflecting it. Further, since the internal space e is filled with the fibrous or porous filler 30, the filler 30 can also absorb sound waves. Moreover, since the density of the filler 30 is set higher as the distance from the speaker unit 10 increases, the filler 30 has a density gradient structure in which the impedance with respect to the sound wave gradually changes, so that the reflection of the sound wave is suppressed. It changes to heat at the end and absorbs sound. Therefore, in addition to the sound absorbing function of the tower-shaped body 20, the sound absorbing function of the filler 30 works synergistically, so that the absorption efficiency of the sound waves radiated from the back surface of the speaker unit can be improved, and the speaker unit can be improved as much as possible. You will be able to reproduce faithful sounds from 10.

4 to 7 show the speaker device S according to the second embodiment of the present invention. The speaker device S includes an enclosure 1 and a speaker unit 10 similar to the speaker device S according to the first embodiment, but the configuration of the sound absorbing member is different. Since the configurations of the enclosure 1 and the speaker unit 10 are the same as those described above, the same reference numerals are given and the description thereof will be omitted. The sound absorbing member includes a tower-like body 20 whose base end is attached to the inner wall surface 2 of the enclosure 1 and whose tip is tapered, and a filler 30.

The tower-shaped body 20 is divided into a plurality of parts along the axis P connecting the base end and the tip end, and the side surface 21 of the plurality of divided bodies T (T1, T2 ... Tn) formed by this division is , Each is formed on a sloping surface that spreads toward the base from the tip. Three or more divided bodies T (T1, T2 ... Tn) are provided (six in the embodiment), and the tower-shaped body 20 is configured by connecting a plurality of divided bodies T in the axial direction. Has been done. Further, the shapes and / or sizes of the divided bodies T (T1, T2 ... Tn) are formed differently.

Specifically, the split body T (T1) at the tip is formed in a conical shape, and the split body T on the proximal end side of the split body T (T1) at the tip has a conical trapezoidal shape having the same inclination of the side surface 21. Is formed in. The split body T (Tn) at the base end is integrally formed with the rear surface plate 6. Further, each divided body T is formed so that the diameter of the bottom surface of the divided body T on the proximal end side is sequentially larger than the diameter of the bottom surface of the divided body T on the distal end side. Further, the heights of the divided bodies T are formed to be the same or different.

Further, the bottom surface 22 of a part of the divided bodies T or all the divided bodies T is recessed. In the embodiment, the bottom surface 22 of the split body T between the split body T (T1) at the tip and the split body T (Tn) at the base end is recessed. The surface of the bottom surface 22 is an inclined surface that spreads toward the base end side from the tip end side and is formed at an angle different from the inclined surface of the side surface 21. Then, a recess 23 is formed between the bottom surface 22 of the recessed split body T (T2, T3, T4, T5) and the tip end portion of the lower split body T (T3, T4, T5, Tn) adjacent thereto. Has been done.

Further, an insertion hole 25 through which the rod 24 can be inserted is formed in the split body T between the split body T (T1) at the tip and the split body T (Tn) at the base end along the axis P thereof. The rod 24 is inserted into the insertion hole 25 in a state where the divided bodies T (T1, T2 ... Tn) are continuously provided, and one end of the rod 24 is fastened to the divided body T (T1) at the tip of the rod 24. The other end is anchored to the base end divided body T (Tn), and the divided body T between the tip divided body T (T1) and the base end divided body T (Tn) is the tip divided body T. It is held by T (T1) and the split body T (Tn) at the base end. Specifically, the insertion hole 25 is also formed in the split body T (Tn) at the base end and the rear surface plate 6. The rod 24 is provided with a head portion 26 at the tip end portion, a male screw 27 is formed at the base end portion, and the base end portion is formed to have a length protruding from the rear surface portion. The head 26 is embedded and fixed in the split body T (T1) at the tip. Then, with the rod 24 inserted into the insertion hole 25, the nut 28 is screwed into the male screw 27 at the base end portion of the rod 24 to form a split body T (T1) at the tip and a split body T (Tn) at the base end. The split body T in between is held by the split body T (T1) at the tip and the split body T (Tn) at the base end. As a result, the divided bodies T (T1, T2 ... Tn) can be aggregated by the rod 24 to form the tower-shaped body 20, so that the tower-shaped body 20 can be easily produced.

The filler 30 is, for example, glass wool, felt, natural fibers such as cotton and wool, chemical fibers such as polyester, polypropylene, acetate and polyamide (nylon), foam materials such as polymers and rubber such as melamine and urethane, and lead and aluminum. It is composed of metal foil, rubber, sheet material such as polymer, non-woven fabric, etc. The filler 30 is provided by filling the speaker unit 10 from the lower surface of the yoke 13 to the facing surface 7, and the density of the filler 30 is set higher as the distance from the speaker unit 10 increases. In the embodiment, the half of the speaker unit 10 side is made of polyester fiber (low density sound absorbing material) and polypropylene fiber (medium density sound absorbing material), and the half of the facing surface 7 side is made of felt (high density sound absorbing material). Moreover, the densities of the polyester fibers (low-density sound-absorbing material), polypropylene fibers (medium-density sound-absorbing material), and felt (high-density sound-absorbing material) are set higher as the distance from the speaker unit 10 increases.

Therefore, according to the speaker device S according to this embodiment, since the tower-shaped body 20 is formed with a tapered tip, the cross-sectional area of the internal space e of the enclosure 1 can be changed, whereby the speaker It is possible to form and absorb a shape in which the acoustic impedance does not substantially change suddenly with respect to the sound wave radiated from the back surface of the unit 10. In this case, since the tower-shaped body 20 is divided and each divided body T (T1, T2 ... Tn) has a side surface 21 formed on an inclined surface, the axial surface of the tower-shaped body 20 is unevenly formed. Therefore, the cross-sectional area of the internal space e of the enclosure 1 can be changed in a complicated manner, and the internal space e is also formed by the inclined surface of the side surface 21 of each of the divided bodies T (T1, T2 ... Tn). Since the cross-sectional area of the sound wave can be changed, the sound absorption mode can be variously supported for a wide frequency band from high to low sound waves as compared with the conventional flat tower-shaped body 20. The absorption efficiency can be further improved, and the faithful sound can be further reproduced from the speaker unit 10.

Further, since the shape and / or size of each divided body T (T1, T2 ... Tn) is different, each divided body T (T1, T2 ... Tn) has a constant frequency. It is possible to make it difficult to generate vibration noise, and it is possible to further improve the absorption efficiency. Further, since a pocket made of the recess 23 is formed on the back surface side of the divided body T in which the recess 23 is formed, sound waves enter the pocket, so that a sound absorbing action is generated and the absorption efficiency is further improved. Can be done. Furthermore, since the surface of the recess 23 is an inclined surface that expands toward the base end side from the tip end side and is formed on an inclined surface at an angle different from the inclined surface of the side surface 21, the thickness of each divided body T is increased. Therefore, in each divided body T, it is difficult to generate a vibration sound having a constant frequency, and it is possible to deal with sound waves of various frequencies. The absorption efficiency can be improved. Therefore, more faithful sound can be reproduced from the speaker unit 10.

Further, since the internal space e is filled with the fibrous filler 30, the energy of sound waves can be absorbed by the filler 30 as well. Moreover, since the density of the filler 30 is set higher as the distance from the speaker unit 10 increases, the filler 10 has a density gradient structure in which the impedance with respect to the sound wave gradually changes, so that the reflection of the sound wave is suppressed. It is guided to the end, and during that time it changes to heat and absorbs sound. Therefore, in addition to the function of forming a shape that does not suddenly change the acoustic impedance of the multi-stage tower-shaped body 20 and guiding it to the end of the enclosure, the sound absorbing function of the filler 30 works synergistically, so that the sound wave absorption efficiency It becomes possible to reproduce the faithful sound from the speaker unit as much as possible.

FIG. 8 shows the speaker device S according to the third embodiment of the present invention. The speaker device S includes an enclosure 1, a speaker unit 10, a tower-shaped body 20 as a sound absorbing member, and a filler 30 similar to the speaker device S according to the second embodiment. Since the configurations of the enclosure 1, the speaker unit 10, the tower-shaped body 20, and the filler 30 are the same as described above, the same reference numerals are given and the description thereof will be omitted. Then, in addition to this, as the sound absorbing member, in addition to the tower-shaped body 20 and the filler 30, a fibrous or porous attached body 40 facing below the bottom surface 22 of the divided body T is used, and the attached body 40 is used. , A configuration is provided in each of a part of the divided bodies T or all the divided bodies T among the plurality of divided bodies T. In the embodiment, the attached body 40 faces the lower side of the bottom surface 22 of the other divided bodies T (T1 to T5) excluding the divided body T (Tn) at the base end. It is attached to the side surface 21.

Examples of the material of the attachment 40 include glass wool, felt, natural fibers such as cotton and wool, chemical fibers such as polyester, polypropylene, acetate and polyamide (nylon), and foam materials such as polymers and rubber such as melamine and urethane. It can be composed of lead or aluminum metal foil, rubber, polymer sheet material, non-woven fabric, or the like. In the embodiment, felt was used. The attached body 40 is formed in a mat shape, and a hole (not shown) through which the tip end side of the divided body T (T2 to Tn) is inserted is formed in the central portion thereof, and the periphery of the central portion is formed by the divided body T (not shown). It is attached to the side surface 21 of T2 to Tn) and is provided so as to face below the bottom surface 22 of the upper divided body T (T1 to T5) of the adjacent divided body T.

Therefore, according to the speaker device S according to this embodiment, the action and effect of the tower-shaped body 20 according to the second embodiment can be obtained, and the sound wave can be absorbed by the attached body 40 as well. Therefore, in addition to the sound absorbing function of the tower-shaped body 20 and the filler 30, the sound absorbing function of the attached body 40 works synergistically, so that the sound wave absorption efficiency can be improved and the speaker unit 10 is as faithful as possible. You will be able to reproduce the sound.

FIG. 9 shows the speaker device S according to the fourth embodiment of the present invention. The speaker device S is configured in the same manner as the speaker device S according to the third embodiment, but unlike the above, the attached body 40 is divided into two or more divided bodies T among the plurality of divided bodies T. A plurality of them are provided corresponding to each, and the density of each attachment 40 is set to be increased as the distance from the speaker unit 10 increases. In the embodiment, the attached body 40 faces the lower side of the bottom surface 22 of the other divided bodies T (T1 to T5) excluding the divided body T (Tn) at the base end. It is attached to the side surface 21, and the density of each attached body 40 is set to increase as the distance from the speaker unit 10 increases. Therefore, even in the row of the attachments 40, a density gradient structure in which the impedance with respect to the sound wave gradually changes is formed, so that further optimization can be achieved.

10 and 11 show the speaker device S according to the fifth embodiment of the present invention. The speaker device S is formed in substantially the same manner as the speaker device S according to the third embodiment. Unlike the above, in the tower-shaped body 20 as the sound absorbing member, the number of the divided bodies T (T1, T2 ... Tn) is reduced by one. In addition, the configuration of the attached body 40 is different. The attached body 40 is formed in a mat shape, the central portion thereof is interposed between the adjacent divided bodies T, and the periphery of the central portion is attached to the side surface 21 of the lower divided body T, and the adjacent divided bodies 40 are adjacent to each other. It is provided so as to face below the bottom surface 22 of the upper split body T of the body T. In the embodiment, three attachment bodies 40 are provided, and between the divided body T (T2) and the divided body T (T3), and between the divided body T (T3) and the divided body T (T4), respectively. , It is interposed between the divided body T (T4) and the divided body T (Tn). As shown in FIG. 11, a through hole 41 through which the rod 24 is inserted is formed in the center of the attachment body 40, and by tightening the nut 28 screwed into the rod 24, the central portion thereof is adjacent to the divided body T. Be held by.

Therefore, according to the speaker device S according to this embodiment, the sound wave can be absorbed by the attached body 40 as well. In this case, since the central portion of the mat-shaped attached body 40 is interposed between the divided bodies T, the vibration of the divided body T is absorbed by the attached body 40 inserted between the divided bodies T, and the divided body T is divided. It is possible to prevent the generation of the vibration sound peculiar to the body T (T1, T2 ... Tn). It is possible to prevent the generation of a vibration sound peculiar to the whole structure, and it is possible to increase the sound absorbing action accordingly. In particular, it can exert a sound absorbing effect in the low frequency range. Therefore, in addition to the sound absorbing function of the tower-shaped body 20 and the filler 30, the sound absorbing function of the attached body 40 works synergistically, so that the sound wave absorption efficiency can be further improved, and the speaker unit 10 can be used as much as possible. You will be able to reproduce faithful sounds. Other actions and effects are the same as above.

FIG. 12 shows the speaker device S according to the sixth embodiment of the present invention. The speaker device S is formed in substantially the same manner as the speaker device S according to the fifth embodiment. Unlike the above, in the tower-shaped body 20 as the sound absorbing member, the number of the divided bodies T (T1, T2 ... Tn) is increased by one. The attached body 40 is formed in a mat shape, the central portion thereof is interposed between the adjacent divided bodies T, and the periphery of the central portion is attached to the side surface 21 of the lower divided body T and is adjacent to the attached body 40. It is provided so as to face below the bottom surface 22 of the divided body T above the divided body T. In the embodiment, five attachment bodies 40 are provided, and are divided between the divided body T (T1) and the divided body T (T2) and between the divided body T (T2) and the divided body T (T3). Between the body T (T3) and the split body T (T4), between the split body T (T4) and the split body T (T5), between the split body T (T5) and the split body T (Tn). It is being mediated. Further, unlike the above, the density of each attachment 40 is set to increase as the distance from the speaker unit 10 increases. Therefore, in addition to the sound absorbing function of the tower-shaped body 20 and the filler 30, the sound absorbing function of the attached body 40 works synergistically, and not only the density inclined structure of the filler 30 but also the impedance with respect to the sound wave in the row of the attached body 40. Since a density gradient structure in which is gradually changed is constructed, further optimization can be achieved.

13 (a) to 13 (e) show the speaker device S according to the seventh to eleventh embodiments of the present invention, respectively. The speaker device S according to the seventh to eleventh embodiments corresponds to the speaker device S according to the second to sixth embodiments, respectively, but unlike the above, the filler as a sound absorbing member. 30 is not provided. That is, the speaker device S according to the seventh embodiment shown in FIG. 13A has a configuration in which the filler 30 is removed from the speaker device S according to the second embodiment shown in FIG. The speaker device S according to the eighth embodiment shown in FIG. 13B has a configuration in which the filler 30 is removed from the speaker device S according to the third embodiment shown in FIG. The speaker device S according to the ninth embodiment shown in (c) has a configuration in which the filler 30 is removed from the speaker device S according to the fourth embodiment shown in FIG. 9 (d). The speaker device S according to the tenth embodiment shown in FIG. 10) has a configuration in which the filler 30 is removed from the speaker device S according to the fifth embodiment shown in FIG. In the speaker device S according to the eleventh embodiment shown, the filler 30 is removed from the speaker device S according to the sixth embodiment shown in FIG. 12, the number of the divided bodies T is reduced by one, and the speaker device S is attached. The number of bodies 40 is reduced by two. Even in the speaker device S according to the seventh to eleventh embodiments, the sound absorbing performance is lowered due to the absence of the filler 30, but the range from high to low is wide as compared with the conventional flat tower-shaped body. Since the sound absorption effect is diversified with respect to the frequency band of the sound wave, the absorption efficiency can be improved.
Although not shown, as the speaker device S according to the twelfth to sixteenth embodiments of the present invention, in the speaker device S according to the seventh to eleventh embodiments, the density is set in the enclosure 1, respectively. Examples thereof include those filled with a uniform filler. The filler can be appropriately selected from those of the above materials. A synergistic effect with the filler can be exhibited.

FIG. 14 shows a modified example of the tower-shaped body 20. The tower-shaped body 20 shown in FIG. 14A is formed by connecting the adjacent split body T on the distal end side and the split body T on the proximal end side via an elastic member 50. The elastic member 50 is made of an adhesive, and the adjacent split body T on the distal end side and the split body T on the proximal end side are adhered to each other.

As a result, the elastic member 50 is interposed between the divided bodies T (T1, T2 ... Tn), so that the vibration of the divided body T is absorbed, and therefore, the vibration peculiar to each divided body T. It is possible to prevent the generation of sound. It is possible to prevent the generation of a vibration sound peculiar to the whole structure, and it is possible to increase the sound absorbing action accordingly. In particular, it can exert a sound absorbing effect in the low frequency range. Other actions and effects are the same as above.

The tower-shaped body 20 shown in FIG. 14 (b) is configured in the same manner as the tower-shaped body 20 shown in FIG. 14 (a), but unlike this, all but the split body T (T1) at the tip. The divided bodies T (T2 to Tn) of the above are formed in a truncated cone shape having the same size and the same shape. The bottom surface 22 of the split body T (T2 to T5) between the split body T (T1) at the tip and the split body T (Tn) at the base end is recessed. This also exerts the same action and effect as the tower-shaped body 20 shown in FIG. 14 (a).

FIG. 15 shows a modified example of how to connect each of the divided bodies T (T1 to Tn). This is to provide a fitting hole 60 centered on the axis P on the bottom surface side of the upper split body T, and to fit into the fitting hole 60 centered on the axis P on the tip end side of the lower split body T. The fitting protrusion 61 is provided, and the fitting hole 60 and the fitting protrusion 61 are fitted and continuously provided. The method of continuous installation may be changed as appropriate.

FIG. 16 shows the main body 4 of another enclosure 1 in the speaker device according to the embodiment of the present invention. In this method, a polygonal (regular heptagon in the figure) hole is formed in the disk-shaped plate unit 4b, and a plurality of the plate unit 4b are laminated to form the peripheral surface 8. It has the same effects and effects as above.

Next, Examples 1 to 4 shown in FIGS. 17 (b), 18 (a) and 19 (b) were prepared, and a sound absorption performance test was conducted together with a comparative example shown in FIG. 17 (a).
<Example 1>
As shown in FIG. 17B, it is the configuration (FIGS. 1 to 3) of the speaker device S according to the first embodiment of the present invention. In the first embodiment, the enclosure 1 is formed into a regular heptagon when viewed from the front by joining seven single plates made of wood. Regarding the size of the enclosure 1, when viewed from the front, the dimension R between the axial center and the apex angle was set to R = 45 mm, and the distance L between the baffle surface 3 and the facing surface 7 was set to L = 200 mm. As the speaker unit 10, a 50 × 40 mm flat speaker unit (“FLAT-C40” manufactured by Fal Co., Ltd.) was used.

Further, the tower-shaped body 20 was made of wood. The diameter of the bottom surface was set to 80 mm, and the height H was set to H = 150 mm. In the filler 30, half of the speaker unit 10 side is made of polyester fiber (low density sound absorbing material) and polypropylene fiber (medium density sound absorbing material), and half of the facing surface 7 side is made of felt (high density sound absorbing material). , The polyester fiber (low density sound absorbing material) and the polypropylene fiber (medium density sound absorbing material) and felt (high density sound absorbing material) were each set to a higher density as the distance from the speaker unit 10 increased.

<Example 2>
As shown in FIG. 18A, it is the configuration (FIGS. 4 to 7) of the speaker device S according to the second embodiment of the present invention. The tower 20 was made of wood. Further, the tower-shaped body 20 is configured by using six divided bodies T formed so that the diameter of the bottom surface of the divided body T on the proximal end side is sequentially larger than the diameter of the bottom surface on the distal end side. The diameter of the bottom surface of the split body T at the most basic end was set to 80 mm, and the total height H was set to H = 150 mm. Others are the same as in Example 1.

<Example 3>
As shown in FIG. 18B, it is the configuration (FIG. 8) of the speaker device S according to the third embodiment of the present invention. An attached body 40 was provided on the tower-shaped body 20 of the second embodiment. The attachment 40 was made of felt. Others are the same as in Example 2.

<Example 4>
As shown in FIG. 19, it is the configuration (FIG. 12) of the speaker device S according to the sixth embodiment of the present invention. In the tower-shaped body 20 of Example 2, an attached body 40 was interposed between the divided bodies T. In each attachment 40, half of the speaker unit 10 side is composed of polyester fiber (low density sound absorbing material) and polypropylene fiber (medium density sound absorbing material), and half of the facing surface 7 side is felt (high density sound absorbing material). The polyester fibers (low-density sound-absorbing material) and the polypropylene fibers (medium-density sound-absorbing material) and felts (high-density sound-absorbing material) were each set in increasing density as the distance from the speaker unit 10 increased. Others are the same as in Example 2.

<Comparison example>
As shown in FIG. 17A, in the comparative example, the filler 30 was removed from the speaker device of the first embodiment, and the sound absorbing member was only a conical tower-shaped body 20.

In the test, the following tests were performed on the speaker devices according to Examples 1 to 4 together with the speaker devices according to Comparative Examples.
In the test, a measurement microphone (BEHRIGER ECM8000) (not shown) was inserted inside the enclosure, and when pink noise was input to the speaker 10 to output sound waves, the frequency characteristics inside the enclosure were measured. The results are shown in FIGS. 17 to 19.

As shown in FIG. 17A, in the comparative example, although the pink noise attenuation intensity is slightly reduced, many peak waveforms in which sound waves are reflected and standing waves appear inside the enclosure are observed. On the other hand, as shown in FIG. 17B, in the first embodiment, the standing wave inside the enclosure and the sound wave in the mid-high range are reduced as compared with the comparative example. In particular, the pink noise attenuation intensity is −30 db or less at 500 Hz and −50 db or less at 5000 Hz, which is extremely good. The same applies to the second embodiment shown in FIG. 18 (a), the third embodiment shown in FIG. 18 (b), and the fourth embodiment shown in FIG. In particular, in the third embodiment shown in FIG. 18B and the fourth embodiment shown in FIG. 19, the effect of absorbing standing waves and sound waves inside the enclosure extends to a low frequency range of 100 Hz (10 dB reduction). In the frequency range of 500 Hz to which is important for hearing, the frequency is reduced by 40 db or more and does not affect the acoustic characteristics at all. Therefore, the standing wave and the sound wave generated in the enclosure caused by the sound wave, which are sounded from the back surface of the speaker 10, do not affect the music information sounded from the front side.

As a result, the original sound recorded on the recording medium is reproduced obediently and can be heard by the viewer. If the sound source was recorded under good conditions, I could get a sense of reality that conveys the orchestra performance, the singing of the singer, and the atmosphere of the venue. It has been possible to provide a speaker device capable of reproducing faithful sound from the speaker unit as much as possible.

In the tower-shaped body 20 according to the above-described second to fourth embodiments, the divided bodies T (T1 to Tn) are joined and formed, but the present invention is not necessarily limited to this, and each divided body T (T1) is not necessarily limited to this. ~ Tn) may be integrally formed, and may be appropriately changed. The number of divided bodies T is also not limited to the above. Further, the side surface of the divided body T (T1 to Tn) according to the above embodiment is formed on a conical surface, but the present invention is not necessarily limited to this, and the divided body T (T1 to Tn) may be formed on a conical surface of a polygonal weight, and may be appropriately modified. You can do it. Further, in the above embodiment, the recess 23 is provided in the divided body T of the tower-shaped body 20, but the present invention is not necessarily limited to this, and the divided body T is formed into a weight shape having a flat bottom surface 22. It is not necessary to form the formed ones in succession to provide the recess 23, and it may be changed as appropriate.

Furthermore, in the above embodiment, the peripheral surface of the main body 4 of the enclosure 1 is formed into a heptagon, but the present invention is not necessarily limited to this, and it may be formed into another square such as a pentagon or a triangle, and is appropriately modified. You can do it. Furthermore, it goes without saying that the material of each part is not limited to the above-mentioned one. The present invention is not limited to the embodiments of the invention described above, and one of ordinary skill in the art will make many modifications to these exemplary embodiments without substantial departure from the novel teachings and effects of the invention. It is easy to do so and many of these modifications are within the scope of the present invention.

S Speaker device 1 Enclosure e Internal space 2 Inner wall surface 3 Baffle surface 4 Main body 4a Plate unit 4b Plate unit 5 Front plate 6 Rear plate 7 Facing surface 8 Peripheral surface P Axis line 10 Speaker unit 11 Diaphragm 12 Frame 13 York 14 Wiring 15 Connection Terminal 20 Tower-shaped body (sound absorbing member)
T (T1, T2 ... Tn) Split body 21 Side surface 22 Bottom surface 23 Recession 24 Rod 25 Insertion hole 26 Head 27 Male screw 28 Nut 30 Filler (sound absorbing member)
40 Attachment (sound absorbing member)
41 Through hole 50 Elastic member 60 Fitting hole 61 Fitting protrusion

Claims (14)

A box-shaped enclosure having an internal space surrounded by an inner wall surface, a speaker unit attached to a wall portion forming a baffle surface composed of one surface of the inner wall surface of the enclosure, and a sound absorbing member provided in the internal space of the enclosure. In a speaker device provided with a tower-like body having a base end attached to the inner wall surface of the enclosure and formed with a tapered tip as the sound absorbing member.
As the sound absorbing member, in addition to the tower-shaped body, a fibrous or porous filler to be filled in the internal space is provided, and the density of the filler is set higher as the distance from the speaker unit increases. Speaker device. A box-shaped enclosure having an internal space surrounded by an inner wall surface, a speaker unit attached to a wall portion forming a baffle surface composed of one surface of the inner wall surface of the enclosure, and a sound absorbing member provided in the internal space of the enclosure. In a speaker device provided with a tower-like body having a base end attached to the inner wall surface of the enclosure and formed with a tapered tip as the sound absorbing member.
The tower-shaped body is divided into a plurality of parts along an axis connecting the base end and the tip end, and the side surfaces of the plurality of divided bodies formed by the division are each spread toward the base end side from the tip end side. A speaker device formed on an inclined surface, wherein the tower-shaped body is formed by connecting the plurality of divided bodies in an axial direction. The speaker device according to claim 2, wherein the shape and / or size of each divided body is different. The bottom surface of some or all of the plurality of divided bodies is recessed, and a recess is provided between the bottom surface of the recessed divided body and the tip of a lower divided body adjacent thereto. The speaker device according to claim 2 or 3, wherein the speaker device is formed. The speaker device according to claim 4, wherein the surface of the bottom surface is formed as an inclined surface that spreads toward the base end side and has an angle different from the inclined surface of the side surface. A state in which three or more of the above-mentioned divided bodies are provided, an insertion hole through which a rod can be inserted is formed in the divided body between the divided body at the tip and the divided body at the base end, and the divided bodies are continuously provided. The rod is inserted into the insertion hole, one end of the rod is fastened to the split body at the tip, and the other end of the rod is fastened to the split body at the base end. The speaker device according to any one of claims 2 to 5, wherein the divided body between the two is held by the divided body at the tip end and the divided body at the base end. The speaker device according to any one of claims 2 to 6, wherein three or more of the divided bodies are provided, and the adjacent divided bodies on the distal end side and the divided bodies on the proximal end side are continuously provided via an elastic member. As the sound absorbing member, in addition to the tower-shaped body, a fibrous or porous attachment body facing below the bottom surface of the division body is used, and the attachment body is a part of the division body among the plurality of division bodies. Alternatively, the speaker device according to any one of claims 2 to 7, wherein each of the divided bodies is provided. Three or more of the divided bodies are provided, the attached body is formed in a mat shape, the central portion thereof is interposed between the adjacent divided bodies, and the periphery of the central portion is the upper divided body of the adjacent divided bodies. The speaker device according to claim 8, wherein the speaker device faces below the bottom surface. 8. The speaker device described. As the sound absorbing member, in addition to the tower-shaped body, a fibrous or porous filler to be filled in the internal space is provided, and the density of the filler is set higher as the distance from the speaker unit increases. The speaker device according to any one of claims 2 to 10. A plurality of the attachments are provided corresponding to two or more of the plurality of divisions, and the density of each attachment is set higher as the distance from the speaker unit increases.
As the sound absorbing member, in addition to the tower-shaped body, a fibrous or porous filler to be filled in the internal space is provided, and the density of the filler is set higher as the distance from the speaker unit increases.
The speaker according to any one of claims 8 to 10, wherein the sound absorption state inside the enclosure is such that the pink noise attenuation intensity is -30 db or less at 500 Hz and -50 db or less at 5000 Hz. Device. The inner wall surface of the enclosure is configured to include a baffle surface on which the speaker unit is provided, a facing surface facing the baffle surface, and a cylindrical peripheral surface connected to the facing surface and the baffle surface. The internal space surrounded by the inner wall surface is formed into a polyhedron, and the peripheral surface is formed so that the contour line viewed from a plane orthogonal to the axis of the peripheral surface has an odd polygonal shape. The speaker device according to any one of claims 1 to 12. The baffle surface and the facing surface are mirror-symmetrical to each other and formed into a polygonal shape corresponding to the polygonal shape of the peripheral surface, the tower-like body is provided on the facing surface, and the distance between the baffle surface and the facing surface is L. The speaker device according to claim 13, wherein 0.3 L ≦ H ≦ L is set when the height of the tower-like body is H.

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