Loudspeaker and manufacturing method for a baffle portion of a loudspeaker

[0024] In this article, the term forward direction refers to the direction in which sound waves are mainly emitted from the speaker. Conversely, the backward direction refers to the opposite of the forward direction. Correspondingly, the terms front and rear refer to the sides of the speaker in the direction of the forward direction or the backward direction, but the sides are orthogonal to the front and rear of the enclosure. In addition, the term axial is used herein to describe the size of sound waves emitted forward or backward.

[0025] The partition part 100 according to an embodiment of the present invention extends rearward so that it forms at least a part of the total internal volume of the loudspeaker 1, preferably at least 50%. In the embodiment described in the drawings, the partition part 100 encloses the entire internal volume of the loudspeaker 1, and thus the loudspeaker 1 is closed by the flat closed section 300. A boundary ridge 122 has been provided to the rear of the encapsulation part for embedding the rear panel 300, for closing the partition part 100, and forming the loudspeaker 1. The closed section 300 may also form a part of the internal volume, thereby providing the rear panel with a forwardly extending wall section (not shown) which encloses the internal volume and engages the corresponding wall section of the partition part 100 .

[0026] The partition part 100 includes a mounting section 110 provided with an opening for receiving the driver 200. In the illustrated embodiment, a mounting section 110 is provided to the front end of the partition part 100, and the mounting section 110 is provided with two openings for forming a two-way loudspeaker. Although the present invention is explained with reference to the figures showing the embodiment of the two-way loudspeaker, the present invention is also applicable to loudspeaker enclosures designed for only one driver, coaxial driver or any other device including at least one driver. Thus, in Figure 1 to 3 , The first opening is provided with an intermediate frequency driver 201, and the second opening is provided with a high frequency driver 202. The partition part 100 is manufactured by molding, such as by injection molding. Therefore, the partition part 100 is an integrated piece having a front wall section and a lateral wall section extending rearward from the front wall section. In particular, the encapsulation section 120, 130, 140 is integrally formed to the installation section 110, so that the section 110, 120, 130, 140 encloses the internal volume of the loudspeaker 1 or at least a part thereof. The encapsulation section includes an encapsulation top section 130 and a bottom section 140 extending backward from the installation section 110. The substantially parallel top section 130 and bottom section 140 are separated to create a height for the loudspeaker 1. The enveloping section further includes two mutually and substantially parallel side sections 120 that extend rearward from the mounting section 110 and are spaced apart to create a width for the loudspeaker 1. When viewed from the top encapsulation section 130 of the partition part 100, the encapsulation side sections 120 extend beyond the encapsulation bottom section 140 and are bent toward each other. The resulting bottom extension 121 enclosing the side section 120 creates a stand for providing a gap between the bottom section 140 and the platform on which the loudspeaker 1 is to be placed. Therefore, the bottom extension 121 is preferably flat and wide enough to provide sufficient support.

[0027] As available from figure 2 It can be seen that the partition part 100 includes an internal reflective port former 150 which is integrally formed by molding as an inner wall section which extends backward from the mounting section 110 to the inside thereof. The reflective port former 150 is formed in a manner similar to the encapsulation sections 120, 130, 140, which extend rearward from the inner surface of the front mounting section 110. Therefore, the reflective port shaper 150 acts as a substantially parallel protrusion molded on the side encapsulation section 120 at a distance from the inside of the side encapsulation section 120. Therefore, the reflective port shaper 150 forms a reflective port 160 that opens to the outside of the partition part 100 and away from the mounting section 110. Therefore, the reflective port 160 is formed in the space between the reflective port shaper 150 and the adjacent encapsulation section 120. It would be feasible to provide another parallel reflective port shaper (not shown) between the reflective port shaper 150 and the side encapsulating section 120, where a reflective port 160 will be formed between the two reflective port shapers. However, the reflective port 160 will be formed in the space between the reflective port shaper 150 and the adjacent encapsulation section in any case, with or without an additional reflective port shaper.

[0028] In the illustrated embodiment, the partition part 100 includes two reflective port shapers 150 that form two corresponding reflective ports 160. The driver opening in the mounting section 110 has a plane with a vertical axis. The internal reflective port shaper 150 is shaped to form a vertical axis that at least partially surrounds the driver opening. This results in a curved reflective port 160 that follows the inner surface of the side envelope section 120 and surrounds the rear parts of the drivers 201, 202, ie, internal components such as magnets. The curvature of the reflective port 160 is further amplified by the initial arch 151 in the free tip of the reflective port shaper 150. The reflective port shaper 150 terminates in another arch at the other end thereof, wherein the shaper 150 merges with the bottom encapsulation section 140. Therefore, the reflection port 160 opens to the outside of the loudspeaker 1. As described above, the bottom extension 121 enclosing the side section 120 creates a stand that provides a gap between the bottom section 140 and the platform on which the loudspeaker 1 is to be placed. Therefore, the reflective port 160 opens to the gap, that is, ends at the gap. In other words, the reflective port 160 is open to the inner edge of the stand formed by the vertical overhangs of the side envelope section 120. More specifically, the reflective port shaper 150 terminates at the inner surface of the bottom encapsulating section 140, whereby the reflective port 160 terminates between the extension 121 of the encapsulating side section 120 and the bottom encapsulating section 140 The slit ( image 3 ).

[0029] As mentioned briefly above, one can also deviate from Figure 1 to 3 The manner of construction shown in establishes the loudspeaker enclosure 1 according to the invention. For example, according to one embodiment, the rear part of the enclosure may also form part of the internal volume, whereby the rear panel will be provided with a forwardly extending wall section (not shown) which Enclose the internal volume and engage with the corresponding wall section of the partition part 100. In such an embodiment (not shown), a supplementary part is formed, whereby the enclosure 1 has two opposite parts: the partition part 100 and the supplementary part. The partition portion may be similar to that described above. Therefore, the supplementary part will also be made by molding, such as by injection molding. In contrast to only a flat back plate, the supplementary part according to the not shown embodiment includes a closed section as described, but it includes an integrated lateral wall section extending forward therefrom. In particular, the enclosing section is integrally formed to the closed section so that the section encloses the internal volume of the microphone enclosure 1 or at least a part thereof. The encapsulation section corresponds to those set forth above. The supplementary part also includes a reflective port shaper, which is an integrated extension of the closed section opposite the mounting section. Therefore the reflective port former protrudes inward from the closed section, that is, forward.

[0030] The supplementary part may alternatively form part of the internal volume of the loudspeaker enclosure, whereby the partition part forms the remainder of the internal volume. It is also feasible to use the supplementary part to form the entire internal volume, whereby the partition part is composed of the front plate. According to one embodiment, the partition part and the supplementary part each form approximately 50% of the internal volume of the enclosure. In an embodiment where both parts define the internal volume of the enclosure, the reflective port is formed by two matching reflective port formers, wherein one reflective port former is provided for the mounting section and the other is provided for the closed section Reflective port shaper. The matching reflection port shaper is designed to be joined so that the reflection port is formed by a sufficiently tight joint to prevent pressure shock waves from leaking from the reflection port through the interface of the matching reflection port shaper.

[0031] As mentioned above, the partition part 100 is manufactured by molding, preferably by injection molding. The encapsulation sections 120, 130, 140 and the reflective port former 150 are formed by feeding materials into the mold via the installation section 110, wherein the encapsulation sections 120, 130, 140 and the reflective port former 150 are removed from the installation section The segment 110 protrudes to the inside of the partition part 110. Therefore, a feeding gate is provided to the mounting section 110 during the molding process. Therefore, the section of the partition part 100 is an integrated part of the part, rather than a separate component thereof. It is therefore preferable to facilitate rounding between the enclosed sections 120, 130 and in the extension 121. In addition, the substantially parallel side envelope sections 120 and the top section 130 and the bottom section 140 are preferably slightly angled to facilitate the ejection of the partition portion 100 from the mold. The partition part 100 may be made of any material suitable for injection molding. However, it is preferable to use a composite material, which includes hot wood powder or hot wood pulp and a polymer, thereby reducing the need for a polishing step in the manufacturing process. This is because such materials make it possible to achieve sufficient surface quality directly in the mold.

[0032] In addition to or instead of the materials described above, it is also feasible to use other materials or composites. For example, it is feasible to develop a composite with a combination of gypsum or mica and polymer. Alternatively, rough saponite, cellulose, hot wood, and glass fiber may be used in such a combination, or in combination with the materials listed above.

[0033] Now refer to the one showing yet another embodiment Figure 4 to 7 , Wherein the reflective port 160 is formed in a corresponding space defined by the reflective port former 150, the encapsulating side section 120 and the termination plate 400. As can be seen from the figure, the reflective port former 150 extends rearward from the inner surface of the mounting section 110 to about half of the partition part 100 in the axial direction. The partition part 100 forms substantially the entire axial area of ​​the enclosure 1, and the closed section 300 is only the back plate. Alternatively, it may be feasible to construct a similar termination plate arrangement so that the enclosure 1 will comprise two halves extending in the axial direction, where the mounting section 100 together with the reflective port former 150 will be in the axial dimension Extends to approximately half of the enclosure 1, and the closed section 300 will be characterized by the corresponding axial areas, ie, the corresponding enveloping side section 120, bottom section 140 and top section 130 (not shown). Other axial ratios are also feasible.

[0034] Therefore, the reflective port 160 is not closed by the closed section 300 in the illustrated embodiment, but is closed by the termination plate 400, which is parallel to the closed section 300 and arranged in the enclosure 1, so that the reflective port 160 Close in the axial direction. Provide a reflective port opening to the bottom of the enclosure, such as figure 2 的实施例中。 In the embodiment. The termination plate 400 enables the volume of the reflection port 160 to be adjusted by limiting the axial length of the reflection port 160 while maintaining the total internal volume of the enclosure. This produces the following benefits: one partition part design can be used for a variety of different diaphragms, and the multiple different diaphragms can be adapted to the enclosure by fine tuning the reflective port with the assistance of the termination plate.

[0035] Refer now Figure 4 , Figure 4 The structure of the reflective port shaper 150 for improved sharpness without the termination plate 400 is shown. The illustrated embodiment features two opposing reflective port formers 150a, 150b, which are arranged adjacent to the opposing side section 120, and thus provide two opposing reflective ports 160a, 160b, two opposing The reflective ports 160a, 160b of the two open to the space between the bottom extensions 121 of the opposite encapsulating side sections 120. The reflective port shaper 150 includes similar figure 2 with Figure 4 The initial arch 151 of the first embodiment shown in, the initial arch 151 forms the internal opening of the reflective port 160. Figure 4 It also shows that the reflective port shaper 150 extends backwards from the mounting section 110 to approximately half of the microphone in the axial direction. Since the reflective port 160 does not end in a closed section in this embodiment (not in Figure 4 Shown in), so the fixing point 152 has been provided for connecting the termination plate 400 to the reflective port former 150. The fixing point 152 may take the shape of an axial bulge made on the inner surface of the reflective port former 150. Since the reflective port former 150 is molded at the same time as the entire partition part 100, the fixing point is also the same, which is advantageous from a manufacturing point of view. The fixing point 152 is preferably threaded after molding. Alternatively, screws may be used, such as PT screws or self-tapping screws.

[0036] Figure 5 Display in lower isometric view Figure 4 This lower isometric view of the partition portion 100 shows the external opening of the reflective port 160 in more detail. As explained above, the outer opening of the reflective port 160 is formed into the space between the opposite bottom extensions 121 of the opposite encapsulating side section 120. In other words, the encapsulating bottom section 140 of the loudspeaker enclosure is recessed upward to provide an integrated stand and create a gap to the external opening of the reflective port 160. Because the partition part 100 is produced as an integrated piece, the difference between the different sections lies in semantics. In fact, the envelope sections 120, 130, 140 form a continuous envelope contour (see also Image 6 ), wherein there is a central upper recess in the bottom section 140 and an opening provided to the upwardly extending side edge of the bottom section 140 for generating the external opening of the reflection port 160. Figure 5 Also shown are bumps similar to those on the reflective port former 150, which are formed on the inner surface of the side encapsulation section 120 for fixing the closure section 300 to the partition part 100.

[0037] Refer now Image 6 , Image 6 The structure of the termination board 400 is shown. The termination plate 400 is adapted to be fixed to the fixing point 152 of the reflective port former 150. Therefore, the termination plate 400 has been provided with a through hole to accommodate the screw. In addition, the termination plate 400 has been sized such that it is tightly fitted between the opposite side sections 120 of the partition part 100 for avoiding leakage in the reflective port 160. Once installed, the termination plate 400 together with the encapsulating side section 120 and the reflective port shaper 150 define the contour of the reflective port 160. As available from Image 6 As further seen in the end plate, the termination plate includes two aligned flat rear flange portions 401 and a front portion 402 in front of the rear flange portion 401, and a connecting front portion 402 to the rear flange portion 401 Two corresponding inclined connecting parts 403. The termination plate 400 is fixed to the reflective port former 150 from the rear flange portion 401, and the connecting portion 403 provides a front extension such that the front portion 402 is engaged with the driver 201 arranged between the reflective port former 150.

[0038] According to an alternative embodiment, the termination plate 400 is substantially flat.

[0039] in Figure 7 The cross-sectional view of shows the components of the loudspeaker enclosure 1. As shown, the installation section 110 accommodates a high-frequency driver 202 and a low-frequency driver 201, and the low-frequency driver 201 is fixed to the enclosure through a termination plate 400. More specifically, when the termination plate 400 is fixed to the reflective port former 150, the low frequency driver 201 is attached to the inner surface of the opening in the mounting section during assembly. The front part 402 of the termination plate 400 pushes the magnet of the low frequency driver 201 forward. A component spring 203 can be used between the low frequency driver 201 and the front portion 402 of the termination plate 400 to ensure tight positioning. Furthermore, depending on the compliance of the spring, there may be an additional effect of removing resonance caused by the combination of the basket and the magnet. Figure 7 It is also shown how the rear flange portion 401 of the termination plate 400 is aligned with the rear end of the outer opening of the reflective port 160. When used to support the driver, the termination plate 400 is preferably perforated (not shown) to allow backward pulses generated by the driver diaphragm to flow through the plate 400 so that the plate 400 causes minimal reflections or pressure peaks. The perforation also prevents the internal volume of the enclosure from being separated, which eliminates unwanted reflections or resonance or both.

[0040] The termination plate 400 can be used to achieve additional benefits. As available from Figure 4 As seen in, the board can be used to fix the low frequency driver 201 to the installation section from the inside of the enclosure. By setting the axial length of the driver 201, the reflective port former 150 and the size of the plate and possible additional spacers (not shown), the driver 201 is simultaneously locked in place when the plate is fixed to the partition part 100 during assembly. Therefore, the fixing device cannot be seen from the outside of the package, and there is one less assembly stage compared with conventional assembly.

[0041] The termination plate can also be used as a fixing point for the absorbing material 500 (such as polyester or glass wool), which is used to eliminate reflections in the enclosure, which can color the sound. The optimal arrangement of the absorbent material is located at and below the horizontal plane of the port opening 151 inside the enclosure, such as Figure 7 In the example of the case where the termination plate 400 is used to support the absorbent material. Placing the absorbent material above the horizontal plane of the port opening 151 will add damping to the air flow through the port. Therefore, the beneficial gain of Helmholtz resonance will be reduced. Placing the absorbent material at the bottom of the enclosure is not effective because the maximum particle velocity of the first-order internal mode in the enclosure volume is located in the center of the volume. An additional benefit of having an absorbent material at the end of the port opening is to add damping to the resonance of the air column formed between the two port openings.

[0042] According to yet another embodiment (not shown), both the driver 201 and the termination plate 400 are locked in place by the axial extension of the closure section 300 during assembly. In this embodiment, the driver 201 and the termination plate 400 are assembled in place without the need for additional fixing devices, whereby the axial extension of the closed section pushes the termination plate 400, and therefore also pushes the driver 201 forward to The right location. Therefore, it is feasible to assemble the three members by using only one set of fixing devices (such as screws) to attach the closing section 300 to the partition part 100.

[0043] Table 1: Parts list

[0044] mark part mark part 1 loudspeaker 161 Internal opening of reflection port 100 Partition 161 External opening of reflective port 110 Install section 200 driver 120 Encapsulate the side section 201 IF driver 121 Bottom extension that encloses the side section 202 High frequency driver 122 ridge 203 Component spring 130 Envelope top section 300 Closed part/section 140 Encapsulate the bottom section 400 Termination board 150 Reflective port shaper 401 Rear flange part 151 Starting arch 402 Front part 152 fixed point 403 Connection part 160 Reflection port 500 Absorbing material.