Resonance tube type speaker enclosure

Abstract

To provide a resonance tube type speaker enclosure capable of enhancing a low sound area by using a sound discharged from a speaker unit back side, which simplifies a manufacturing and a trial manufacturing, and facilitates an adjustment of a frequency of the sound discharged from an open part and an adjustment of a sound pressure.SOLUTION: A resonance tube type speaker enclosure is constructed so that components obtained by dividing a role of a baffle component 2, an air chamber component 3, a separation component 4, a sound route component 5, and a rear panel component 6 are overlapped as shown in Figure 1 and Figure 6 and completed. A flow of a route into the sound route component is in a XY shaft direction viewed from a front surface of a sound route component crown-shaped cross section, thereby adjusting a sound pressure to be enhanced by expanding and compressing the sound route component to a Z shaft direction. A frequency enhanced by mainly exchanging an internal structure of the sound route component can be adjusted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a resonance tube type speaker enclosure. [Background technology]

[0002] A resonance tube type speaker enclosure has a tube, also called a sound path, inside, and uses the sound emitted from the back of the speaker unit to create an air column resonance inside the tube, which is then radiated from the open end to increase the sound pressure in the low range.The resonance frequency of the most common one-sided open resonance tube in resonance tube type speaker enclosures can be calculated by the speed of sound (meters) / length of resonance tube (meters) / 4, and the decrease or increase in sound pressure is basically proportional to the increase or decrease in the cross-sectional area of ​​the entire resonance tube.

[0003] However, there are easier ways to enhance low-frequency sounds using bass reflex and passive radiator types, while resonance tube speaker enclosures have the disadvantage that it is difficult to adjust the frequency to be enhanced, as they can enhance not only the low frequency sounds but also the mid- and high frequency sounds. Combined with the need for long tubes, they are relatively difficult to manufacture.

[0004] Also, if the cross-sectional area of ​​the tube is small, it is not possible to obtain sufficient bass enhancement. Since it is difficult to adjust the cross-sectional area after production, the method of making it large in advance is often used, and huge examples of resonance tube type speaker enclosures stand out. Also, if this long tube is shown as it is, the external shape tends to be unconventional.

[0005] There is also a box-shaped resonance tube structure (those with many folds are also called acoustic labyrinth types) in which a tube is added to the left and right when viewed from the front of the speaker unit, creating a fold in the sound path from front to back, and then assembled into a box shape, but in this case, if you try to expand only the cross-sectional area of ​​the sound path without changing the length of the sound path, you have to make it larger in the horizontal direction when viewed from the front, which has a significant impact on the appearance, and also has an impact on installation and sound quality (baffle diffraction, etc.). These are constraints that are almost not present in the same box-shaped bass reflex or passive radiator type enclosures.

[0006] Due to these drawbacks, there are very few commercial or home-built speakers that use resonator tube speaker enclosures compared to enclosures for other bass enhancement technologies.

[0007] The main instruments that utilize the resonating tube phenomenon are wind instruments such as the flute, saxophone, and tuba. Wind instruments that produce low sounds such as the tuba have long and large tubes, so the shape becomes complex by winding the tube, and the difficulty of making them increases. [Prior art documents] [Non-patent literature]

[0008] [Non-Patent Document 1] Publisher: Kumio Horiuchi "Let's Make Speakers!" Ongaku No Tomosha 2022 p12, 13 p66, 67 p72, 73 p80, 81 Summary of the Invention [Problem to be solved by the invention]

[0009] The problem to be solved is to provide the flexibility of sound pressure and frequency adjustment in the resonance tube type speaker enclosure, simplify the manufacturing difficulty, and make it easier to choose the resonance tube type as compared to the bass reflex type and passive radiator type when deciding the type of speaker enclosure. The flexibility of sound pressure and frequency adjustment also contributes to miniaturization. [Means for solving the problem]

[0010] The present invention is a resonance tube type speaker enclosure that is constructed by forming parts with different internal shapes for each function using a CNC machine tool or a 3D printer, and stacking the parts. In addition, by bending the entrance of the sound channel, the sound traveling direction is converted from the Z axis to the XY axis when viewed from the front of the sound channel part's coronal cross section, and the increase or decrease in the sound channel cross-sectional area is in the Z axis direction when viewed from the front of the sound channel part's coronal cross section.

[0011] However, since it is possible to use a mold for mass production or to process by hand, there is no restriction on the molding technology of the material. It is also possible to mold parts with shapes that have multiple functions, and in particular when mass-producing an item that has already been adjusted in the same shape, it is possible to integrate all the functions. Effect of the Invention

[0012] In the structure (Fig. 1) of the resonance tube type speaker enclosure of the present invention, which is simply described, the enclosure is divided into a baffle part 2 on which the speaker unit is attached, an air chamber part 3 which is located immediately after the speaker unit and which is the closed end if the resonance tube is open on one side, a partition part 4 which separates the air chamber from the sound path, a sound path part 5 which occupies most of the resonance tube, and finally a rear panel part 6 which closes the back side of the sound path. By changing the thickness and the number of layers of the parts which mainly include the functions of the air chamber part 3 and the sound path part 5, it is possible to adjust the sound pressure to be increased. If adjustment is possible, there is no need to make it large in advance, and it is possible to find a favorable point while measuring the sound pressure, or to pursue miniaturization while balancing the sound.

[0013] In addition, by using CNC machine tools and 3D printers, it is possible to form complex cavities and grooves inside the parts, and in particular, in the sound channel parts, complex internal shapes can be used to suppress the increase in the mid- and high-frequency range, or to expand the sound like a horn toward the opening. The length of the sound channel can also be adjusted by design, and changing the length changes the resonance frequency of the resonance tube. Since the length of the sound channel can be adjusted by simply replacing the parts of the sound channel, there is no need to remake the entire enclosure when trying out multiple sound channel patterns, but rather it is possible to simply replace the sound channel.

[0014] If the exterior of each part is cubic, the overlapping shape will also be cubic, so instead of bonding plates at right angles as in conventional box-shaped speakers, it is possible to create a cubic (box-shaped) enclosure, which is a universal speaker design, simply by overlapping them. In addition, since the increase or decrease in the cross-sectional area of ​​the sound path is in the Z-axis direction as viewed from the front of the sound path part's crown cross section, there is no longer a restriction to expanding the housing in the XY-axis direction as viewed from the front of the sound path part's crown cross section in order to expand the cross-sectional area of ​​the sound path, and the impact on the appearance, installation, and sound quality is also reduced. Furthermore, since the internal shape of the resonance tube is already formed, the number of parts required to create the sound path is also reduced compared to conventional enclosures with box-shaped resonance tube structures. However, the exterior shape of the parts being cubic is not a constituent requirement of the present invention. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is an external view of an example of a simple resonance tube type speaker enclosure produced according to the present invention. [Diagram 2] FIG. 2 is a front view of the baffle component 2. [Diagram 3] FIG. [Figure 4] FIG. 4 is a front view of the partition part 4 that separates the air chamber and the sound passage. [Diagram 5] FIG. 4 is a front view of a sound-way part 5 that forms the shape of the sound way. [Figure 6] FIG. 1 is an external view of an example of an expandable resonance tube type speaker enclosure manufactured according to the present invention. [Figure 7] FIG. 7 is a front view of the parts 14, 15, and 16 used in FIG. [Figure 8] FIG. 7 is a front view of the parts 19, 20, 21, 22, and 23 used in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] However, it is also possible to create a shape in which all the functions are combined, in cases where parts with multiple functions are produced, or when mass-producing a part in a fixed shape after adjustments are complete. EXAMPLES

[0017] Fig. 1 is an external view of an enclosure simply constructed according to the present invention. The thickness of the parts is uniform for the sake of convenience, but it is not necessary that they are uniform in reality, and the mounting holes of the units and the open ends of the resonance tubes do not have to face the front.

[0018] The first part seen from the front is shown in Figure 2, and is called the baffle part. The shaded areas in Figures 2, 3, 4, and 5 are the coronal sections and also the bottoms of the parts. 7 and 8 in Figure 2 are cavities, 7 is the mounting hole for the speaker unit, and 8 is the open end of the resonance tube. Sound radiated to the back of the speaker unit attached to 7 causes air column resonance in the air chamber and sound path, and is radiated from the open end of 8.

[0019] Figure 3 is a front view of part 3 which creates the air chamber. 9 and 10 are hollow. The front side of 9 connects to the open end of 8, and the back side connects to the sound path through 12. 10 is the space which creates the air chamber. In front of the part in Figure 3 is the baffle part in Figure 2, and 10 is closed by attaching the speaker unit. At the rear is the partition part in Figure 4, and only 11 connects to the sound path, so the space of 10 does not come into direct contact with the outside air. Also, the volume of the air chamber can be adjusted by increasing or decreasing the number of overlapping parts in Figure 3, or by changing the thickness of the parts. The air chamber written here is a name for convenience, and the air chamber is also part of the tube.

[0020] Figure 4 is a front view of part 4, which separates the air chamber from the sound passage. Numerals 9 and 11 are hollow. The front side of 9 is connected to the open end of 8, and the front side of 11 is connected to 10 and the back side is connected to 12.

[0021] Figure 5 is a front view of the sound channel part 5 that forms the sound channel. 9, 12, and 13 are all part of the sound channel and are hollow, and are covered by placing the rear panel part 6 on the back side, forming part of the tube that connects 10 to 8. Because the sound channel flows along the XY axis when viewed from the front, the internal shape of the part is suitable for production with a CNC machine tool or 3D printer. 9 connects to the open end of 8 on the front side, and 12 connects to 10 through 11 on the front side.

[0022] In Figure 1, the parts are divided into five parts based on their roles, but it is possible for one part to have multiple roles by, for example, making the hollow parts into grooves. EXAMPLES

[0023] Fig. 6 is an external view of a speaker enclosure whose structure has been expanded using the present invention. It is for convenience that all parts are cubic and have the same thickness, but in reality, they do not all need to be cubic or have the same thickness. Also, there is no need to limit the number of openings to one.

[0024] 14 is a baffle part, and the resonance tube starts at 10 inside the spatial part 15, and the direction of the stacking of the sound channel parts is switched downward at the partition part 16. However, even when switched downward, the sound channel flows on the XY axis when viewed from the front of the coronal cross section of the sound channel parts. 17 and 24 are solid plates and act as lids.

[0025] There are two sound passages, divided into 19 and 21. A partition part 20 is inserted between the two sound passages. Providing multiple sound passages in this way is one way to adjust the sound passage length, but the internal shape of each sound passage divided by partitions always flows along the XY axis when viewed from the front of the crown cross section of the sound passage part. It is also possible to provide multiple air chambers in the same way as the sound passages.

[0026] 22 is a plate that separates the sound passage of 21 from the opening of 23, and 24 is a single plate. 8 is the open end of the resonance tube, from which the amplified sound is emitted. The thin line of 25 is a simplified visualization of the flow of the tube inside the enclosure, from the baffle part of 14 to the open end of 8.

[0027] Figures 7 and 8 are front views of the components in Figure 6. The components 17 and 24, which are single plates, are omitted. Also, the sound path sections 19 and 21 are shown to have the same shape for the sake of convenience, but in reality they do not need to have the same shape. [Explanation of symbols]

[0028] 2 Baffle parts in the speaker enclosure in Figure 1 3 Air chamber parts in the speaker enclosure of Figure 1 4 Partition part in the speaker enclosure in Figure 1 5 Sound path parts in the speaker enclosure in Figure 1 6 Rear panel part (lid) of the speaker enclosure in Figure 1 7 Speaker unit mounting holes 8 Open end hole 9 Hole connecting the sound passage and the open end 10 Air chamber hole 11 Hole connecting the air chamber and the sound passage, or connecting the sound passages 12 Connection part that connects the 11 holes to the sound channel 13 Ondo 14 Baffle parts in the speaker enclosure of Figure 6 15 Air parts in the speaker enclosure of Figure 6 16 The part that separates and connects the air chamber and the sound channel in the speaker enclosure shown in Figure 6. 17 Rear panel part (lid) of the air chamber in the speaker enclosure of Figure 6 19 The first sound path part in the speaker enclosure in Figure 6 20 Part that separates and connects the first and second sound paths in the speaker enclosure shown in Figure 6 21 The second sound path part in the speaker enclosure of Figure 6 22 Part that separates and connects the second sound path part 21 and the opening part 23 in the speaker enclosure of FIG. 6 23 Openings in the speaker enclosure of Figure 6 24 Rear panel part (lid) of the opening in the speaker enclosure in Figure 6 25 Thin lines showing the flow of the resonator in the speaker enclosure of Figure 6. 26 23 opening

Claims

1. This is a resonance tube type speaker enclosure characterized by stacking parts that function as a baffle, air chamber, partition, sound channel, and rear panel, and bending the entrance of the sound channel to convert the direction of sound travel from the Z axis to the XY axis when viewed from the front of the sound channel part's crown cross section, and limiting the increase or decrease in the sound channel cross section area to the Z axis when viewed from the front of the sound channel part's crown cross section.

2. The resonance tube type speaker enclosure of claim 1, wherein the stacking direction is bent midway.

3. In any one of claims 1 and 2, the air chamber, the partition, and the sound passage parts are arranged repeatedly.

4. In any one of claims 1 to 3, a component that performs multiple functions as an integrated unit among a baffle, an air chamber, a partition, a sound passage, and a rear panel is stacked.

5. In any one of claims 1 to 3, the baffle, air chamber, partition, sound passage, and rear panel are all integrated into a single part.

6. In any one of claims 1 to 5, the volume of the air chamber or sound path can be changed to adjust the sound pressure to be enhanced, and the internal structure of the sound path can be changed to adjust the resonance frequency to be enhanced.

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