JP3890183B2 - Bass reflex enclosure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bass-reflex type enclosure, and particularly relates to a waterproof type.
[0002]
[Prior art]
The bass reflex type enclosure is intended to reproduce a low frequency range satisfactorily by providing a port (duct) having an opening in a speaker mounting surface in a sealed envelope. Since a port opened on the speaker mounting surface is provided, rainwater or the like may enter the envelope from this port. Therefore, conventionally, a bass reflex type enclosure as shown in FIG. 8 is used. That is, the speaker 6 is attached to the speaker attachment surface 4 of the substantially rectangular parallelepiped envelope 2. Further, a port 8 is attached to the speaker attachment surface 4. In order to prevent rainwater or the like from entering the envelope 2, the inner end of the port 8 is curved upward.
[0003]
[Problems to be solved by the invention]
However, in this enclosure, in order to prevent the intrusion of rainwater, the enclosure can be arranged only in the state shown in FIG. 8, for example, in the state where the envelope 2 is laid sideways. I can't. That is, there is a problem that the degree of freedom of the arrangement of the enclosure is low. Enclosures that are to be laid sideways must be manufactured with the inner end of the port curved upward in a separately laid down state. Further, it is desirable that the port 8 is integrally formed with the speaker mounting surface 4 from the viewpoint of reducing the number of parts and the number of assembly steps. However, since the port 8 has a curved portion, it cannot be integrally formed with the speaker mounting surface 4, increasing the number of parts and increasing the number of assembly steps.
[0004]
An object of the present invention is to provide a waterproof bass-reflex enclosure with a high degree of freedom in arrangement. Another object of the present invention is to provide a waterproof bass-reflex enclosure that can reduce the number of parts and reduce the number of assembly steps.
[0005]
[Means for Solving the Problems]
The bass reflex enclosure of one embodiment of the present invention includes an envelope to which a speaker is attached. This envelope is of a sealed type. One end of a port is opened in the envelope, and the port has a peripheral wall surrounding a straight line extending from the opening in the envelope, and the inner end is closed. The envelope is arranged in one of a first arrangement state and a second arrangement state rotated about 90 degrees around an axis parallel to the straight line from the first arrangement state. . The port has an opening in a peripheral wall near the inner end, and is vertical to a horizontal plane passing through the straight line and passing through the straight line in both the first and second arrangement states. The opening is formed at a position away from a portion below the horizontal plane.
[0006]
In this bass reflex enclosure, the opening is located at a position away from the vertical plane passing through the straight line below the horizontal plane passing through the straight line, regardless of whether the first or second arrangement state is provided. positioned. That is, there is no opening in the lower portion of the port in both the first and second arrangement states. Therefore, in any of the first and second arrangement states, rainwater does not enter the envelope from this opening, and the degree of freedom of arrangement is high and waterproofing is possible.
[0007]
The opening may be formed by removing a part of the inner end of the port. If comprised in this way, when shape | molding a port using a type | mold, the shape of a type | mold will become simple and manufacture will become easy.
[0008]
In addition, the port can be formed integrally with the envelope. In this case, the number of parts and the number of assembling steps are reduced, facilitating the manufacturing, and the mold used for manufacturing the envelope and the port can be used with a relatively simple configuration, thereby reducing the manufacturing cost. be able to.
[0009]
A bass reflex enclosure according to an aspect of the present invention includes an envelope having an attachment surface to which a speaker is attached. One end of the port is opened in the envelope, and the port has a peripheral wall extending from the envelope to the inside so as to surround a straight line extending from the opening, and an inner end connected to the tip of the peripheral wall Is blocked . This port is formed integrally with the envelope. In the peripheral wall portion of the inner end portion of a predetermined arrangement of said envelope, divided into two upper than the horizontal surface of the port by the vertical plane passing through the straight line that intersects the horizontal plane and in which through the line One of the sections is removed, and at least the edge of the inner end portion following the section is removed to form an opening.
[0010]
In this bass-reflex type enclosure, in the arrangement state, the peripheral wall portion and the inner end portion above the horizontal plane passing through the port are removed to form the opening, so that it can be waterproofed. Moreover, since the port is formed integrally with the envelope, and not only the peripheral wall portion but also a part of the inner end portion is removed, the port is relatively simple in a mold for integrally molding with the envelope. Can be used. In addition, the number of parts and the number of assembly steps can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The bass-reflex type enclosure according to an aspect of the present invention has a substantially rectangular parallelepiped envelope 10 as shown in FIG. The envelope 10 is a sealed type. As shown in FIG. 1, the envelope 10 is arranged in a vertically long state, and has a mounting surface, for example, a speaker mounting surface 12 having a substantially rectangular shape, on the front surface thereof. A circular sound emitting hole 14 is formed in the speaker mounting surface 12. A speaker, for example, a woofer 16 is disposed inside the envelope 10 so as to emit sound from the sound emitting hole 14, and is fixed to the inner surface of the speaker mounting surface 12. Although not shown, a tweeter is also provided in the envelope 10.
[0012]
A port (duct) 18 is formed integrally with the speaker mounting surface 12 so as to be positioned above the woofer 16. One end of the port 18 is open to the speaker mounting surface 12. The port 18 has a peripheral wall portion 20 extending inward of the envelope 10 so as to surround, for example, a straight line indicated by an alternate long and short dash line in FIG. The external shape is, for example, a cylindrical shape. The other end of the port 18 is gradually reduced in diameter toward the central axis side and is finally closed.
[0013]
An opening 22 is formed on the other end side of the port 18. As shown in FIGS. 2 and 3, the opening 22 is located on the upper side of four upper and lower regions defined by a horizontal plane that passes through the central axis of the port 18 and a vertical plane that also passes through the central axis. The peripheral wall portion and the inner end portion of one region are removed. As is apparent from FIG. 3, the opening 22 has an angle range of about 90 degrees. The opening 22 is positioned perpendicular to the horizontal plane passing through the central axis indicated by the alternate long and short dash line and away from the portion below the horizontal plane in the plane passing through the central axis.
[0014]
In the bass reflex type enclosure configured in this way, as shown in FIG. 4A, when the opening 22 is in the first arrangement state located at a position equal to or higher than the horizontal plane passing through the central axis, the speaker mounting surface 12 Even if rainwater enters the port 18 from the opening in the opening 18, since the opening 22 is above the horizontal plane passing through the central axis of the port 18, rainwater can enter the envelope 10 from the opening 22. There is no.
[0015]
Further, in the second arrangement state in which the envelope 10 is rotated about 90 degrees counterclockwise from the first arrangement state shown in FIG. 4A, the opening 22 passes through the central axis of the port 18. Since it is located at a position above the horizontal plane, rainwater does not enter the envelope 10 from the opening 22.
[0016]
Therefore, since the opening 22 is formed as described above, rainwater can enter the envelope 10 even if the envelope 10 is arranged in either arrangement state of FIG. 4A or 4B. There is no freedom in arrangement.
[0017]
Further, the opening 22 is formed by removing not only a part of the peripheral wall part 20 but also a part of the inner end part. Therefore, even when the port 18 is formed by a mold, a simple shape can be used. Further, since the opening 22 is formed by removing not only a part of the peripheral wall part 20 but also a part of the inner end part, even if the speaker mounting surface 12 and the port 18 are integrally molded, The mold used for manufacturing becomes simple.
[0018]
The opening area of the port 18 on the speaker mounting surface 12 and the opening area of the opening 22, that is, the total area of the portions indicated by the symbols a, b, and c are set to be equal. Accordingly, this bass reflex enclosure operates in the same manner as a normal bass reflex enclosure.
[0019]
FIG. 5 shows a port 18a used in a bass reflex type enclosure according to the second embodiment of the present invention. Since the configuration of the port 18a is the same as that of the first embodiment except that the shape of the port 18a is different, the description other than the port 18a is omitted.
[0020]
The port 18a is formed in a quadrangular prism shape, and an opening 22a is formed by removing a portion near the inner end portion of the peripheral wall 20a. Similarly to the opening 22 of the port 18 of the first embodiment, the opening 22a also has an inner surface of the port 18a that is divided into four upper and lower regions by a horizontal plane passing through the central axis indicated by a one-dot chain line and a vertical plane passing through the central axis. The peripheral wall 20a of one divided upper region is removed.
[0021]
In this port 18a, in the same manner as the port 18 of the first embodiment, intrusion of rainwater or the like into the envelope can be prevented in any of the first and second arrangement states different by about 90 degrees. Above, the enclosure with this port 18a operates in the same way as a normal bass reflex enclosure. Moreover, in the bass reflex enclosure of the second embodiment, when the opening 22a is formed, the removal of the inner end of the port 18a is limited to the wall thickness of the port peripheral wall. Therefore, waterproofness is further improved. Moreover, since the removal of the inner end portion is performed as described above, it is possible to perform the die cutting at the time of manufacturing the port, and to reduce the manufacturing cost. Of course, even in the cylindrical port as in the first embodiment, the removal of the inner end portion can be similarly limited to the wall thickness of the port peripheral wall portion to further improve the waterproofness.
[0022]
A bass reflex type enclosure according to a third embodiment of the present invention is shown in FIG. Similarly to the first embodiment, this bass reflex enclosure also has a woofer 16 attached to the speaker mounting surface 12 of the envelope 10 and a port 18b provided above it. The port 18b has a square opening that opens to the speaker mounting surface 12. However, this opening is arranged in a state where the square is rotated about 45 degrees. From this opening, the port 18 extends into the envelope 10 so as to surround the central axis along the central axis thereof, like the port 18 of the first embodiment, and as shown in FIG. From the vicinity, it gradually curves with a radius substantially equal to the length of one side of the opening, and the inner end is closed. An opening 22b is formed in the peripheral wall near the inner end. The opening 22 has a peripheral wall portion of one region located on the upper side of the upper and lower four regions defined by the horizontal plane passing through the central axis of the port 18b and the vertical plane passing through the central axis, with a thickness of about the same. It has been removed. The cross-sectional area of the port 18b is equally formed from the opening in the speaker mounting surface 12 to the opening 22b at the inner end.
[0023]
Since the port 18b has a simple shape, it can be easily manufactured. In particular, when manufacturing using a mold, it is possible to easily perform rearward punching and reduce manufacturing costs. Moreover, since the cross-sectional area does not change from the opening of the attachment surface 12 to the opening 22b at the inner end including the curved portion, the acoustic characteristics are excellent.
[0024]
In the above-described three embodiments, the openings 22, 22a, 22b are one on the upper side of the four regions divided by the horizontal plane passing through the central axis and the vertical plane, and the first and second arrangement states In any case, it was formed in a position above the horizontal plane. However, the present invention is not limited to this. For example, in any of the first and second arrangement states, an opening is formed in a portion below the horizontal plane passing through the central axis in the vertical plane passing through the central axis. If it is a position which is not located, an opening part can be arrange | positioned in various positions.
[0025]
Further, in the above three embodiments, the openings 22, 22a, and 22b all have an angle range of 90 degrees passing through the central axis, but have an angle range larger or smaller than 90 degrees. It may be a thing.
[0026]
In the above-described three embodiments, the ports 18, 18a, and 18b are cylindrical and prismatic, but the present invention is not limited to this, and may be, for example, elliptical. In the above embodiment, the ports 18, 18 a, and 18 b are provided above the speaker 16. Furthermore, although the ports 18, 18 a, and 18 b are provided on the speaker mounting surface 12, the ports 18, 18 a, and 18 b are not necessarily provided on the speaker mounting surface 12, and can be provided, for example, on the side surface or the back surface of the envelope 10. .
[0027]
In the above three embodiments, the speaker 16 is provided on the speaker mounting surface 16 provided on the front surface of the envelope 10. However, the speaker 16 may be provided on the back surface of the envelope 10 in the envelope 10.
[0028]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain a bass reflex enclosure having a high degree of freedom in arrangement and an improved waterproof function. In addition, according to the present invention, it is possible to obtain a bass reflex enclosure having a sufficient waterproof function in addition to reducing the number of parts and the number of assembly steps.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a bass reflex enclosure according to a first embodiment of the present invention.
2 is a partially omitted side view of a port used in the bass reflex enclosure of FIG. 1. FIG.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4 is a front view showing different usage states of the bass reflex type enclosure of FIG. 1; FIG.
FIG. 5 is a partially omitted perspective view of a port used in a bass reflex enclosure according to a second embodiment of the present invention.
FIG. 6 is a vertical side view of a bass reflex type enclosure according to a third embodiment of the present invention.
7 is a partially omitted perspective view of a port used in the bass reflex type enclosure of FIG. 6. FIG.
FIG. 8 is a vertical side view of a conventional bass reflex enclosure.
[Explanation of symbols]
10 envelope 12 speaker mounting surface 16 speaker 18 18a port 20 20a peripheral wall 22 22a opening

Claims (4)

An envelope to which a speaker is attached;
One end of the envelope has an opening, the envelope has a peripheral wall surrounding a straight line extending from the opening, and a port whose inner end is closed.
Have
The envelope is arranged in any one of a first arrangement state and a second arrangement state rotated about 90 degrees around an axis parallel to the straight line from the first arrangement state,
The port has an opening in a peripheral wall near the inner end, and in any of the first and second arrangement states, the port is perpendicular to a horizontal plane passing through the straight line and a vertical plane passing through the straight line. A bass-reflex enclosure in which the opening is formed at a position away from a portion below the horizontal plane. 2. The bass reflex enclosure according to claim 1, wherein the opening is formed by removing a part of an inner end of the port. 3. The bass reflex enclosure according to claim 2, wherein the port is formed integrally with the envelope. An envelope to which a speaker is attached ;
One end is opened in the envelope, and has a peripheral wall extending from the envelope to the inside thereof so as to surround a straight line extending from the opening, and an inner end connected to the tip of the peripheral wall is closed, A port formed integrally with the envelope;
Has, in the peripheral wall of the inner end portion of a predetermined arrangement of said envelope, above the said horizontal plane of said ports by a vertical plane passing through the straight line that intersects the horizontal plane and in which through the line A bass-reflex type enclosure in which one of the two sections is removed and at least an edge of the inner end following the section is removed to form an opening .

Images