WO2021033609A1 - Enclosure, speaker system, and method for producing same - Google Patents

Abstract

Provided is an enclosure which has a cross-sectional shape with excellent acoustic characteristics and with which it is easy to form a sound path of an appropriate length. The enclosure 1 constitutes a speaker system that encloses at least one continuous sound path 2. The enclosure 1 contains a first block 10 in which a plurality of sheets 5 are stacked. The first block 10 is provided with at least one first through-hole 11 constituting all or part of the sound path 2. The first through-hole 11 is formed across the plurality of sheets 5 constituting the first block 10. In the first block 10, the shapes of at least one set of adjacent sheets 5 are different.

Description

Enclosures, speaker systems and how they are manufactured

The present invention relates to an enclosure, a speaker system provided with the enclosure, and a method for manufacturing the same.

The back load horn type speaker system is equipped with a sound path (horn) whose cross-sectional area gradually increases. The longer the sound path, the more the mid-high range is attenuated and the low range is emphasized. Therefore, the long sound path is folded like a bellows and housed in the enclosure. Enclosures for back load horns tend to be expensive to manufacture because they require processing of complex shaped sound paths.

The resonance tube type speaker system emphasizes the bass by utilizing the natural vibration of the air column. The enclosure for the resonance tube has a long sound path having a length corresponding to the wavelength to be resonated (for example, 1/4 of the wavelength in the case of the TQWT type). If the sound path is not bent smoothly, unwanted reflected sound is likely to occur, so the enclosure tends to be tall with the minimum number of folds.

In order to mechanize the processing of the sound path, an enclosure in which the sound path is formed from multiple laminated plates has been proposed. For example, in Patent Document 1, a plurality of intermediate plates sandwiched between a pair of side plates are prepared, and slits (gap between adjacent bent walls) meandering in a zigzag shape of exactly the same shape are formed in each intermediate plate. A speaker box in which these plate materials are laminated and bonded is disclosed. A single continuous sound path is formed by combining a number of slits cut out at the same position.

Japanese Unexamined Patent Publication No. 2003-204586

However, in the speaker box described in Patent Document 1, the left and right widths are the same as the total thickness of the plurality of intermediate plates, and a sound path having a rectangular cross section is formed. The cross section of the sound path can only be adjusted up and down. Further, if the sound path is formed over the entire width on the left and right of the speaker box, the sound path cannot be folded back and arranged side by side, so that the length of the sound path that can be designed is limited. When a back load horn type speaker system is configured by using the speaker box described in Patent Document 1, it is difficult to form a sound path having an ideal length. When a resonance tube type speaker system is configured, an undesired reflected sound is likely to be generated because the cross section of the sound path is rectangular.

Therefore, an object of the present invention is to provide an enclosure having a cross-sectional shape excellent in acoustic characteristics and easily forming a sound path having a suitable length.

The enclosure according to one aspect of the present invention constitutes a speaker system including at least one continuous sound path. The enclosure includes a first block in which a plurality of plates are laminated. The first block is provided with at least one first through hole that constitutes a part or all of the sound path. The first through hole is formed so as to straddle a plurality of plate members constituting the first block. In the first block, adjacent plate members may have different shapes from each other.

According to this aspect, the first through hole is formed across a plurality of plate materials. By dividing into a plurality of plate materials, even a concave cylindrical surface can be designed so as not to include an undercut, and a sound path having a desired cross-sectional shape can be processed. Compared to a sound path with a rectangular cross section, undesired standing waves are less likely to occur. Since the cross section of the first through hole is not a rectangle that extends to the entire width of the left and right sides of the enclosure, the first through hole can be folded back and arranged side by side. Therefore, it is possible to provide an enclosure having excellent acoustic characteristics and easily forming a sound path having a suitable length.

In the above aspect, the cross-sectional shape of the first through hole may be circular.

According to this aspect, a sound path having a circular cross section having excellent acoustic characteristics can be constructed. Undesired standing waves and reflected sounds are less likely to occur.

In the above aspect, the stacking direction of the plurality of plate materials constituting the first block is the first direction. The first through hole may extend along the first plane direction substantially orthogonal to the first stacking direction.

In this aspect, the first through hole is formed along the plane of each plate material. When a plurality of plate materials are laminated to form a first through hole, the stepped surface between the plate materials does not face the traveling direction of sound. If the stepped surfaces between the plate materials face each other in the traveling direction of the sound, undesired reflected sound may be mixed and the acoustic characteristics may be deteriorated. According to this aspect, such reflected sound can be suppressed.

In the above aspect, a second block in which a plurality of plate materials are laminated in a second stacking direction different from the first stacking direction may be further included. The second block is provided with at least one second through hole that forms part of the sound path. The second through hole extends along the second plane direction substantially orthogonal to the second stacking direction, and is formed over a plurality of plate members constituting the second block. In the second block, adjacent plate members may have different shapes from each other. The end of the second through hole is connected to the end of the first through hole.

According to this aspect, the first through hole and the second through hole formed in at least two blocks in which a plurality of plate materials are laminated in different directions are connected. For example, by combining the first through hole extending in the front-back and left-right directions and the second through-hole extending in the front-back and front-back directions, the entire sound path can be folded three-dimensionally. The enclosure can be configured compactly. It can also accommodate an ideal length of sound path.

In the above aspect, the first stacking direction may be the width direction or the height direction of the speaker system.

According to this aspect, the depth direction of the speaker system, that is, the normal direction of the front surface to which the speaker unit is mounted is included in the first plane direction orthogonal to the first stacking direction. When the first through hole is formed along the first plane direction, the traveling direction of the sound output from the back surface of the speaker unit does not face the stepped surface between the plate materials. Since undesired reflected sound can be suppressed, sound quality is improved.

A speaker system including an enclosure of the above aspect and a speaker unit that converts an electric signal into sound may be configured.

According to this aspect, it is possible to provide a speaker system in which the cross-sectional shape and length of the sound path are ideal.

According to the present invention, it is possible to provide an enclosure having a cross-sectional shape excellent in acoustic characteristics and easily forming a sound path having a suitable length.

FIG. 1 is a perspective view showing an example of an enclosure according to the first embodiment of the present invention. FIG. 2 is a perspective view showing the enclosure shown in FIG. 1 in an exploded manner. FIG. 3 is a perspective view showing an example of the enclosure of the second embodiment of the present invention in an exploded manner. FIG. 4 is a perspective view showing a sound path formed by grooves on the concave cylindrical surface shown in FIG. FIG. 5 is a perspective view showing an example of the enclosure of the third embodiment of the present invention in an exploded manner. FIG. 6 is a perspective view showing a sound path formed by grooves on the concave cylindrical surface shown in FIG. FIG. 7 is a perspective view showing another example of the enclosure according to the third embodiment of the present invention in an exploded manner. FIG. 8 is a perspective view showing a sound path formed by grooves on the concave cylindrical surface shown in FIG. 7. FIG. 9 is a perspective view showing an example of the enclosure of the fourth embodiment of the present invention in a partially disassembled manner. FIG. 10 is a cross-sectional view showing the capacity of the air chamber changed by the attachment shown in FIG. 9 and the cross-sectional area of the inlet of the sound path. FIG. 11 is a perspective view showing an example of the enclosure of the fifth embodiment of the present invention with a part cut out. FIG. 12 is a perspective view showing a sound path formed by grooves on the concave cylindrical surface shown in FIG. FIG. 13 is a perspective view showing the enclosure shown in FIG. 11 in an exploded manner. FIG. 14 is a perspective view showing an example of the enclosure of the sixth embodiment of the present invention in an exploded manner. FIG. 15 is a perspective view showing a sound path formed by grooves on the concave cylindrical surface shown in FIG.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings. In each figure, those having the same reference numerals have the same or similar configurations. As shown in FIGS. 1 to 15, the enclosure 1 of the present invention is characterized in that the sound path 2 is formed by laminating plate members 5 having different shapes. Since the cross-sectional shape of the sound path 2 can be freely designed, it is possible to obtain excellent acoustic characteristics by making the cross-sectional shape, for example, circular. Since the cross section of the sound path 2 is not a rectangle extending over the entire width of the left and right sides of the enclosure 1, a long sound path 2 folded three-dimensionally can also be configured.

When constructing a three-dimensionally folded sound path 2, the space inside the enclosure 1 is divided into several parts according to the extending direction of the sound path 2, and the plate material is matched with the main extending direction of the sound path 2. A plurality of blocks 10, 20, and 30 having different stacking directions of 5 may be combined. In each of the blocks 10, 20 and 30, the sound path 2 is divided into a plurality of plate members 5 so as not to include an undercut, and can be machined by a triaxial machining center. From the viewpoint of acoustic characteristics, it is preferable to divide the sound path 2 so that the stepped surface 7 between the plate material 5 and the plate material 5 does not face the traveling direction of the sound from the viewpoint of suppressing the reflected sound.

Since the enclosure 1 of the present invention can be folded and accommodated three-dimensionally even if the sound path 2 is long, the bass is amplified by a long horn such as a back load horn type, a front horn type, or a reverse horn type. It is suitable for the speaker system S of the system. Since the sound path 2 can be folded back with a smooth curved surface to suppress undesired reflected sound, it is suitable for, for example, a resonance tube type speaker system S such as a TQWT type, a transmission line type, or an IR type. First, the enclosure 1 for the back load horn will be described with reference to FIGS. 1 to 10. Next, the enclosure 1 for the resonance tube will be described with reference to FIGS. 11 to 13. Further, the enclosure 1 for the front load horn will be described with reference to FIGS. 14 and 15.

[First Embodiment]
FIG. 1 is a perspective view showing an example of the enclosure 1 according to the first embodiment of the present invention. The enclosure 1 of each embodiment of the present invention can form various speaker systems S in combination with a speaker unit U or the like that converts an electric signal into sound. In the illustrated example, a back load horn type speaker system S is configured.

As shown in FIG. 1, the enclosure 1 is output from the first opening 3 to which the speaker unit U can be assembled, the second opening 4 formed at a position different from the first opening 3, and the back surface of the speaker unit U. A sound path 2 for guiding the sound to the second opening 4 is provided. An air chamber 41 may be further provided between the back surface of the speaker unit U and the inlet (throat) 42 of the sound path 2. The speaker system S may further include an attachment 40 mounted on the first opening 3 and a stand that supports the enclosure 1. The attachment 40 will be described in detail later with reference to FIGS. 9 and 10. The above-mentioned sound path 2 is housed in the enclosure 1 in a folded state.

The enclosure 1 of each embodiment of the present invention has a sound path 2 having a circular cross section. When the cross section is circular, an undesired standing wave is less likely to be generated as compared with a sound path having a rectangular cross section, and the acoustic characteristics are excellent. However, the cross-sectional shape of the sound path 2 is not limited to a circular shape, and may be an elliptical shape or the like. The sound path 2 is preferably formed so as to increase in diameter from the entrance 42 to the second opening 4, but is not limited to this. In the illustrated example, the sound path 2 is formed on the curved surface of the exponential horn whose cross-sectional area increases exponentially in the traveling direction of the sound. However, the sound path 2 may have a shape in which the cross-sectional area does not necessarily increase in the traveling direction of the sound, for example, a part of the sound path 2 is composed of a straight line. The traveling direction of the sound is, for example, the direction away from the speaker unit U in the direction along the locus connecting the centers of the cross sections of the sound path.

FIG. 2 is a perspective view showing the enclosure 1 shown in FIG. 1 in an exploded manner. As shown in FIG. 2, the enclosure 1 includes a first block 10 in which a plurality of plate members 5 are laminated. The enclosure 1 may further include a second block 20 and a third block 30, which will be described later, or may further include an exterior plate 8 attached to them. In the illustrated example, a front baffle, which is an example of the exterior plate 8, is mounted on the front surface of the enclosure 1 in which the speaker unit U is arranged. When the exterior plate 8 is attached, the appearance and rigidity of the enclosure 1 are improved.

The first block 10 is composed of a plurality of laminated plate materials 5. Similarly, the second and third blocks 20 and 30 are composed of a plurality of laminated plate members 5. The second and third blocks 20 and 30 will be described in detail later with reference to FIGS. 5 to 8. In the following description, the direction in which the plurality of plate materials 5 are laminated is referred to as a stacking direction, and the plurality of directions along the main surfaces 5A and 5B of each plate material 5 are collectively referred to as a plane direction.

Further, the stacking direction of the first block 10 is called the first stacking direction Rz, and the plane direction of the first block 10 is called the first plane direction Rxy. Similarly, the stacking direction and the plane direction D of the second block 20 described later are called the second stacking direction Sz and the second plane direction Sxy, respectively, and the stacking direction and the plane direction of the third block 30 described later are the third stacking directions, respectively. It is called Tz and Txy in the third plane direction. The first to third stacking directions Rz, Sz, and Tz may be orthogonal to each other.

In the illustrated example, the first stacking direction Rz coincides with the width direction (left-right direction) W of the speaker system S. However, the first stacking direction Rz is not limited to the illustrated example, and may be the depth direction (front-back direction) D of the speaker system S or the height direction (vertical direction) H. Each plate member 5 has a first main surface 5A, a second main surface 5B opposite to the first main surface 5A, and an end surface 5C connecting between the first and second main surfaces 5A and 5B. It is formed in the shape of a flat plate.

An example of the above-mentioned stacking direction is the normal direction of the first or second main surfaces 5A and 5B. Each board 5 is, for example, a wooden board such as solid wood or medium density fiberboard (MDF), and in the illustrated example, the board thickness is about 3 cm. However, the plate material 5 is not limited to the illustrated example, and various materials and plate thicknesses can be appropriately selected from the viewpoint of processing and acquisition.

A groove 6 on a concave cylindrical surface is formed in each plate material 5. The groove 6 is an example of a cavity formed in the plate material 5. In the first block 10, at least one set (pair) of adjacent plate members 5 is formed with grooves 6 having different shapes. For example, the plate material 5 shown in FIG. 2 has grooves 6 having different shapes. In the illustrated example, the groove 6 extends in the first plane direction Rxy along the main surfaces 5A and 5B of the plate member 5. In other words, the groove 6 extends in a direction substantially orthogonal to the first stacking direction Rz. When a plurality of plate members 5 are laminated in the first stacking direction Rz, the plurality of grooves 6 are united to form one continuous first through hole 11. The first through hole 11 constitutes at least a part of the sound path 2. In the illustrated example, the first through hole 11 constitutes the entire sound path 2. The sound path 2 according to the first embodiment extends along Rxy in the first plane direction and is two-dimensionally folded.

In order to manufacture the enclosure 1, a plurality of plate materials 5 are prepared, and a groove 6 on a concave cylindrical surface is formed in each plate material 5. A groove 6 may be formed in the large-sized plate material 5 and divided into a plurality of plate materials 5. The enclosure 1 can be obtained by laminating a plurality of plate members 5 so as to form one continuous sound path 2 when the grooves 6 are united.

A machining center is preferable for processing the plate material 5. If the stacking direction of the plate material 5 is designed to match the elevating direction (Z-axis direction) of the tool of the machining center, the sound path will not include the shape (undercut) in which the lower part is hollowed out so as to leave the overhanging part. Since 2 can be divided, the enclosure 1 can be machined with a 3-axis machining center without using a 5-axis machining center.

In the enclosure 1 of the first embodiment configured as described above, the first through hole 11 having a circular cross section is formed so as to straddle the plurality of plate members 5. Therefore, it is possible to provide an enclosure 1 for a back load horn which has a cross-sectional shape excellent in acoustic characteristics and can easily form a sound path 2 having a suitable length. Since the first through hole 11 is divided into a plurality of grooves 6, each groove 6 can be designed so as not to include an undercut. If the groove 6 includes an undercut, it cannot be machined by triaxial cutting, so an expensive five-axis machining center or the like is required.

Focusing on a pair of plate members 5 and 5 adjacent to each other, the second main surface 5B of the other plate material 5 which is covered by the first main surface 5A of one plate material 5 is slightly exposed, and as a result, the sound path 2 A stepped surface (hereinafter referred to as a stepped surface 7) may occur. In the first embodiment, the stepped surface 7 between the plate material 5 and the plate material 5 constituting the first block 10 does not face the traveling direction of the sound. Therefore, undesired reflected sound can be suppressed. Since the block is a solid block except for the portion where the first through hole 11 is formed, it is possible to suppress tube noise and the like in which the sound path 2 vibrates as compared with the case where the sound path is housed in a hollow box.

Next, the enclosure 1 of the second to sixth embodiments of the present invention will be described with reference to FIGS. 3 to 15. For the configuration having the same or similar function as the configuration of the first embodiment, the description of the corresponding first embodiment will be referred to with the same reference numerals, and the description thereof will be omitted here. The other configurations are the same as those in the first embodiment.

[Second Embodiment]
FIG. 3 is a perspective view showing an example of the enclosure 1 of the second embodiment of the present invention in an exploded manner. The second embodiment is different from the first embodiment in that the sound path 2 is three-dimensionally folded. In the illustrated example, the first stacking direction Rz, which is the stacking direction of the plurality of plate members 5 constituting the first block 10, coincides with the depth direction D of the speaker system S.

The first through hole 11 constituting the entire sound path 2 is divided into a plurality of short through holes 9 instead of the groove 6 on the concave cylindrical surface. The through hole 9 is an example of a cavity formed in the plate material 5 like the groove 6. As shown in FIG. 3, in the first block 10, through holes 9 having different shapes may be formed in the adjacent plate members 5. In the illustrated example, the folded first through holes 11 are formed side by side in the width direction W of the speaker system S. Further, in the illustrated example, six exterior plates 8 are mounted so as to surround all six surfaces of the first block 10, forming a rectangular parallelepiped box.

FIG. 4 is a perspective view showing a sound path 2 composed of the short through hole 9 shown in FIG. In the second embodiment, as in the first embodiment, the first through hole 11 constitutes the entire sound path 2. In the illustrated example, the sound path 2 extends not only back and forth and up and down but also left and right, and is three-dimensionally folded. According to the second embodiment, as shown in FIG. 4, even a long sound path 2 can be three-dimensionally folded and accommodated in the enclosure 1. Therefore, the size of the enclosure 1 can be made compact. Since the size of the enclosure 1 is not restricted, the sound path 2 having an ideal length can be formed.

[Third Embodiment]
FIG. 5 is an exploded perspective view showing an example of the enclosure 1 according to the third embodiment of the present invention. As shown in FIG. 5, the enclosure 1 of the third embodiment includes the first and second blocks 10 and 20 in which the stacking directions of the plate members 5 are different. In the illustrated example, the first stacking direction Rz, which is the stacking direction of the first block 10, coincides with the width direction W of the speaker system S, and the second stacking direction Sz, which is the stacking direction of the second block 20, is the speaker system. It coincides with the height direction H of S. In the second block 20, at least one set of adjacent plate members 5 is formed with grooves 6 having different shapes. For example, as shown in FIG. 5, in the first block 10, grooves 6 having different shapes may be formed between adjacent plate members 5. Similarly, in the second block 20, grooves 6 having different shapes may be formed between the adjacent plate members 5.

FIG. 6 is a perspective view showing a sound path 2 formed by a groove 6 on a concave cylindrical surface shown in FIG. As shown in FIG. 6, the sound path 2 according to the third embodiment not only spreads up and down and front and back, but also spreads left and right and is three-dimensionally folded. As shown in FIG. 6, the sound path 2 is composed of a first through hole 11 formed in the first block 10 and a second through hole 21 formed in the second block 20. The end of the second through hole 21 is connected to the end of the first through hole 11.

The second through hole 21 constitutes a part of the sound path 2 like the first through hole 11. In the illustrated example, the sound path 2 is divided into three parts, the entrance portion and the exit portion of the sound path 2 are formed by the first through hole 11, and the intermediate portion of the sound path 2 connecting the entrance portion and the exit portion is the second. It is composed of a through hole 21. More specifically, the outlet side end of the first through hole 11 in the upper stage and the inlet side end of the second through hole 21 in the middle stage are connected, and the outlet side end and the lower stage of the second through hole 21 are connected. Is connected to the end of the first through hole 11 on the inlet side. The first through hole 11 includes a straight line portion 111 in which a locus connecting the centers of the cross sections extends substantially linearly, and a bent portion 112 in which the locus connecting the centers of the cross sections is bent in a substantially arc shape. .. Similarly, the second through hole 21 includes a straight portion 211 and a bent portion 212.

The third embodiment will be described again with reference to FIG. As described in the first embodiment, when the groove 6 is formed in the first block 10 along the first plane direction Rxy, the first through hole 11 formed by coalescing the grooves 6 is formed with the plate material 5. The traveling direction of the sound does not face the stepped surface 7 with the plate material 5. Similarly, in the second block 20, when the groove 6 is formed along the second plane direction Sxy, the second through hole 21 formed by uniting the grooves 6 is a stepped surface between the plate material 5 and the plate material 5. The traveling direction of the sound does not face 7.

However, a slight stepped surface may occur at the connection portion between the first through hole 11 and the second through hole 21. The sound path 2 is configured so that the traveling direction of sound does not face the stepped surface 7 between the plate material 5 and the plate material 5, except for the connection portion between the first through hole 11 and the second through hole 12. In the illustrated example, at least in the straight portions 111 and 211, the traveling direction of the sound is not opposed to the stepped surface. According to the third embodiment, similarly to the second embodiment, the long sound path 2 can be three-dimensionally folded and accommodated in the enclosure 1. Further, in the third embodiment, since the plurality of blocks 10 and 20 having different stacking directions are combined, it can be configured so that the traveling direction of the sound does not face the stepped surface 7 between the plate material 5 and the plate material 5.

FIG. 7 is a perspective view showing another example of the third embodiment in an exploded manner. In the illustrated example, the enclosure 1 includes the first to third blocks 10, 20, and 30 in which the plate members 5 are laminated in different directions. In the illustrated example, the first stacking direction Rz, which is the stacking direction of the first block 10, coincides with the height direction H of the speaker system S, and the second stacking direction Sz, which is the stacking direction of the second block 20, is the speaker. The third stacking direction Tz, which corresponds to the depth direction D of the system S and is the stacking direction of the third block 30, coincides with the width direction W of the speaker system S. A third through hole 31, which will be described later, is formed in the third block 30. The third through hole 31 constitutes a part of the sound path 2 like the first and second through holes 11 and 21.

As shown in FIG. 7, in the first block 10, grooves 6 having different shapes may be formed between adjacent plate members 5. Similarly, in the third block 30, grooves 6 having different shapes may be formed in the adjacent plate members 5. The first and third blocks 10 and 30 are configured so that the traveling direction of the sound does not face the stepped surface 7 between the plate material 5 and the plate material 5.

When the first block 10 and the third block 320 having different stacking directions Rz and Tz are bonded to each other, depending on the processing accuracy, the first through hole 11 of the first block 10 and the third through hole 31 of the third block 30 There may be a step between the two. In the illustrated example, the second block 20 is interposed between the first block 10 and the third block 30, and the second block 20 smoothly connects the first through hole 11 and the third through hole 31. There is.

The second through hole 21 of the second block 20 is formed in a shape that is easy to process so that the positional deviation between the first through hole 11 and the third through hole 31 can be easily adjusted. In the illustrated example, the second through hole 21 is composed of a short through hole 9 continuous with the second stacking direction Sz, which is the stacking direction of the second block 20. The second through hole 21 may be formed by a groove 6 along the second plane direction Sxy.

FIG. 8 is a perspective view showing a sound path 2 formed by a groove 6 on a concave cylindrical surface shown in FIG. 7. The first through hole 11 extends in the first plane direction Rxy at a plurality of heights. The second and third through holes 21 and 31 connect the first through holes 11 and 11 having different heights. More specifically, the second through hole 21 connects between the first through hole 11 in the middle stage and the first through hole 11 in the lower stage, and the third through hole 31 is the first through hole 11 in the upper stage and the first through hole 11 in the middle stage. It is connected to 1 through hole 11. The first to third through holes 11, 21, 31 are connected to each other to form a continuous sound path 2.

In the first through hole 11 in the middle stage, the folded parts are lined up on the left and right. Focusing on the first through hole 11 in the middle stage, the length of the first through hole 11 can be doubled as compared with the case where the first through hole 11 is not folded back. Similar to the first and second through holes 11 and 21, the third through hole 31 has a straight portion 311 in which a locus connecting the centers of the cross sections extends substantially linearly and a locus connecting the centers of the cross sections. It includes a bent portion 312 bent in an arc shape.

In the modified example shown in FIG. 8, since the third block 30 whose stacking direction is different from that of the first and second blocks 10 and 20 is further included, the blocks are finely divided according to the extending direction of the sound path 2. Can be divided. By combining blocks 10, 20, and 30 having different stacking directions, the sound path 2 can be configured so that the traveling direction of sound does not face the stepped surface 7 between the plate material 5 and the plate material 5, even if the shape is complicated, which is undesired. The reflected sound of can be suppressed.

[Fourth Embodiment]
FIG. 9 is a perspective view showing an example of the enclosure 1 of the fourth embodiment of the present invention in a partially disassembled manner. The fourth embodiment is different from the first embodiment in that the attachment 40 to be attached to the first opening 3 is further provided. As shown in FIG. 9, the attachment 40 is formed in a funnel shape, for example, like a mouthpiece of a wind instrument.

FIG. 10 is a cross-sectional view showing the capacity V of the air chamber 41 changed by the attachment 40 shown in FIG. 9 and the cross-sectional area A of the inlet 42 of the sound path 2. As shown in FIG. 10, the enclosure 1 of each of the embodiments described so far includes an air chamber 41 and a sound path 2. The purpose of the air chamber 41 is to amplify the vibration of the speaker unit U (shown in FIG. 1) and transmit it to the sound path 2. The inlet 42 of the sound path 2 is a bottleneck in which the cross-sectional area A (throat cross-sectional area) at the inlet 42 is narrowed in order to compress the air in the air chamber 41 and efficiently transmit the vibration energy to the sound path 2. There is.

It is known that the relationship between the capacity V of the air chamber 41 and the cross-sectional area A at the inlet 42 has a great influence on the sound quality in the speaker system S. However, in the conventional speaker system, once the enclosure and the speaker unit are assembled, it is difficult to change the capacity of the air chamber and the cross-sectional area of the inlet later.

According to the present invention, since the enclosure 1 having excellent dimensional accuracy can be mass-produced by NC (numerical control) processing, the assembly accuracy of the attachment 40 and the enclosure 1 which are retrofit parts can be ensured. As shown in FIG. 10, by attaching the attachment 40, the capacity of the air chamber 41 and the cross-sectional area of the inlet 42 can be changed. The inner diameter of the tip of the attachment 40 and the inner diameter of the inlet 42 may be matched with each other. In that case, only the capacity V of the air chamber 41 can be changed without changing the cross-sectional area A of the inlet 42.

Note that the attachment 40 according to the fourth embodiment can be attached to various enclosures as long as it is an enclosure having excellent dimensional accuracy, and is not limited to a combination with an enclosure 1 in which a plurality of plate materials 5 are laminated. For example, the attachment 40 may be attached to a resin enclosure formed by means such as stereolithography or injection molding.

[Fifth Embodiment]
FIG. 11 is a perspective view showing an example of the enclosure 1 according to the fifth embodiment of the present invention with a part cut out. The enclosure 1 shown in FIG. 11 can be combined with the speaker unit U or the like described above to form a resonance tube type speaker system S. FIG. 12 is a perspective view showing a sound path 2 formed by a groove 6 on a concave cylindrical surface shown in FIG. In the fifth embodiment, as shown in FIG. 12, the first opening 3 to which the speaker unit U is assembled is not in the terminals E1 and E2 of one continuous sound path 2, but in the vicinity of the intermediate point of the sound path 2. It is formed.

FIG. 13 is a perspective view showing the enclosure 1 shown in FIG. 11 in an exploded manner. In the illustrated example, the enclosure 1 is composed of a first block 10 in which a plurality of plate members 5 are laminated in the first stacking direction Rz. The sound path 2 extends along the first plane direction Rxy and is two-dimensionally folded. As described above, the enclosure 1 may include the first to third blocks 10, 20, and 30 in which the plate members 5 are laminated in different directions. When the second block 20 and the like are included, the sound path 2 can be folded three-dimensionally.

In the resonance tube type speaker system, a tall enclosure with the sound path folded back only once is in circulation. According to the fifth embodiment, as shown in FIG. 11, since the sound path 2 can be folded back with a smooth curved surface, undesired reflected sound is unlikely to be generated even if the sound path 2 is folded back. The size of the enclosure 1 for the resonance tube can be made compact by folding the sound path 2 a plurality of times instead of once.

[Sixth Embodiment]
FIG. 14 is a perspective view showing an example of the enclosure 1 of the sixth embodiment of the present invention in an exploded manner. FIG. 15 is a perspective view showing a sound path 2 formed by a groove 6 on a concave cylindrical surface shown in FIG. The enclosure 1 shown in FIG. 14 can form a front load horn type speaker system S in combination with the speaker unit U or the like described above. As shown in FIG. 15, the enclosure 1 for the front load horn is arranged on the front side of the speaker unit U, and includes a sound path 2F whose cross-sectional area increases as the distance from the speaker unit U increases.

According to the sixth embodiment, it is possible to provide the enclosure 1 for the front load horn in which the sound path 2F having a smooth curved surface is formed. The back load horn type or resonance tube type sound path 2R described above may be arranged on the back side of the speaker unit U. In the illustrated example, the front side of the speaker unit U is configured as a front load horn type, and the back side of the speaker unit U is configured as a resonance tube type. According to the present invention, since the blocks can be finely divided according to the extending direction of the sound path 2, even a complicated sound path 2 in which the front load horn type and the resonance tube type are combined has undesired reflection. Sound can be minimized.

The embodiments described above are for facilitating the understanding of the present invention, and are not for limiting and interpreting the present invention. Each element included in the embodiment and its arrangement, material, condition, shape, size, etc. are not limited to those exemplified, and can be changed as appropriate. In addition, the configurations shown in different embodiments can be partially replaced or combined.

For example, the first to third blocks 10, 20, and 30 according to the third embodiment shown in FIG. 7 are placed and adhered to the upper surface of the first block 10 according to the first embodiment shown in FIG. Then, the exterior plate 8 may be attached to these four types of blocks (10 + 10, 20, 30) to form an enclosure 1 containing two sound paths 2. For example, in the fifth embodiment, the taper of the sound path 2 may be omitted. In the resonance tube type speaker system S, as shown in FIG. 11, if the sound path 2 is tapered, the resonance of odd-order harmonics can be suppressed. If the taper of the sound path 2 is omitted, it becomes easier to process and the manufacturing cost of the enclosure 1 can be suppressed. For example, the sound path 2 whose cross-sectional area gradually decreases in the traveling direction of the sound may be formed and configured as a reverse horn type speaker system S. For example, a sound absorbing material may be attached to the inner wall surface of the sound path 2 configured as a back load horn system or a resonance tube system, and the speaker system S may be configured as an acoustic maze system in which a sound range other than bass is absorbed by the sound absorbing material. ..

1 ... Enclosure, 2 ... Sound path, 3 ... 1st opening, 4 ... 2nd opening, 5 ... Plate material, 5A ... 1st main surface, 5B ... 2nd main surface, 5C ... End surface, 6 ... Groove, 7 ... Step Surface, 8 ... Exterior plate, 9 ... Through hole, 10 ... 1st block, 11 ... 1st through hole, 20 ... 2nd block, 21 ... 2nd through hole, 30 ... 3rd block, 31 ... 3rd through hole , 40 ... Attachment, 41 ... Air chamber, 42 ... Sound path inlet, A ... Throat cross-sectional area, D ... Depth direction, H ... Height direction, Rz ... First stacking direction, Rxy ... First plane direction, S ... Speaker system, Sz ... 2nd stacking direction, Sxy ... 2nd plane direction, Tz ... 3rd stacking direction, Txy ... 3rd plane direction, U ... Speaker unit, V ... Air chamber capacity, W ... Width direction.

Claims (6)

1. An enclosure that constitutes a speaker system that includes at least one continuous sound path.
   Including the first block in which a plurality of plate materials are laminated,
   The first block is provided with at least one first through hole that constitutes a part or all of the sound path.
   The first through hole is formed so as to straddle a plurality of plate members constituting the first block.
   In the first block, at least one set of adjacent plate members has different shapes.
   Enclosure.
2. The cross section of the first through hole is circular.
   The enclosure according to claim 1.
3. The stacking direction of the plurality of plate materials constituting the first block is the first stacking direction.
   The first through hole extends along a first plane direction substantially orthogonal to the first stacking direction.
   The enclosure according to claim 1 or 2.
4. Further including a second block in which a plurality of plate materials are laminated in a second stacking direction different from the first stacking direction.
   The second block is provided with at least one second through hole that forms a part of the sound path.
   The second through hole extends along a second plane direction substantially orthogonal to the second stacking direction, and is formed so as to straddle a plurality of plate members constituting the second block.
   In the second block, at least one set of adjacent plate members has different shapes.
   The end of the second through hole is connected to the end of the first through hole.
   The enclosure according to claim 3.
5. The first stacking direction is the width direction or the height direction of the speaker system.
   The enclosure according to claim 3 or 4.
6. The enclosure according to any one of claims 1 to 5.
   Equipped with a speaker unit that converts electrical signals into sound,
   Speaker system.
   
   

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