WO2014115464A1

WO2014115464A1 - Bass reflex duct, speaker apparatus, and acoustic device

Info

Publication number: WO2014115464A1
Application number: PCT/JP2013/084362
Authority: WO
Inventors: 一平來山
Original assignee: 三洋電機株式会社
Priority date: 2013-01-22
Filing date: 2013-12-20
Publication date: 2014-07-31
Also published as: JP2014143469A

Abstract

The present invention provides a bass reflex duct capable of improving acoustic effects, and a speaker apparatus and an acoustic device provided with the same. This bass reflex duct is placed in a cabinet accommodating a speaker and is provided with a tube part for establishing communication between the inside and the outside of the cabinet, the tube part having disposed therein a lattice frame constituted by connecting rods the profile of which on the interior side of the cabinet is curved. The lattice frame can be disposed leaving some space from an opening on the exterior side of the tube part. This speaker apparatus is provided with the bass reflex duct.

Description

Bass reflex duct, speaker device and audio equipment

The present invention relates to a bass reflex duct for low-frequency output, and also relates to a speaker device and an acoustic device including the bass reflex duct.

There is a device provided with a bass reflex duct that guides bass output from the back side of the speaker to the outside in order to increase the output of the bass range in a speaker device or an acoustic device including the speaker (see, for example, Patent Document 1).

JP 2008-48176 A

Since the bass reflex duct communicates with the interior of the speaker device and the audio equipment, foreign matter may enter the interior of the speaker device through the bass reflex duct.

Therefore, the inventors installed a lattice frame formed in a lattice shape from a box having a rectangular cross section in a bass reflex duct. However, as a result of the sound that passes through the bass reflex duct hits the lattice frame and is reflected, acoustic effects such as sound spreading and sound omission are not sufficient.

An object of the present invention is to provide a bass reflex duct capable of improving the acoustic effect, and a speaker device and an acoustic device including the bass reflex duct.

The bass reflex duct of the present invention is
A bass reflex duct that is arranged in a housing containing a speaker and has a cylindrical portion that communicates the inside and outside of the housing,
In the cylindrical portion, a lattice frame formed by connecting casings having a curved cross section on the inner side of the casing is disposed.

In the bass reflex duct according to the present invention, at least the inside of the housing has a curved cross-section with respect to the lattice frame disposed in the tubular portion of the bass reflex duct, so that sound passing through the bass reflex duct hits the housing and is reflected. The sound effects such as the spread of sound output from the bass reflex duct and sound omission can be enhanced.

FIG. 1 is a perspective view of an audio device to which the present invention is applied. FIG. 2 is an exploded perspective view of an audio device to which the present invention is applied. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1, and is a cross-sectional view with the speaker grille removed. FIG. 4 is a perspective view of the grill frame as viewed obliquely from the front. FIG. 5 is a perspective view of the grill frame as viewed obliquely from the rear. 6 is an enlarged cross-sectional view taken along the line BB in FIG. FIG. 7 is an exploded perspective view of a speaker grill that employs a plate-shaped covering material as a covering material. FIG. 8 is an enlarged cross-sectional view showing a state in which the plate-like covering material is adhered to the first covering material attaching recess. FIG. 9 is a perspective view of a speaker grill that employs a plate-shaped covering material. FIG. 10 is an exploded perspective view of a speaker grill that employs a cloth-like covering material as a covering material. FIG. 11 is an enlarged cross-sectional view showing a state in which the cloth-like covering material is thermocompression bonded to the second covering material attaching recess. FIG. 12 is a perspective view of a speaker grill that employs a cloth-like covering material. 13 is a cross-sectional view taken along line CC in FIG. FIG. 14 is a perspective view of the circle D in FIG. 5 and shows the boss in an enlarged manner. FIG. 15 is a perspective view of the bass reflex duct. 16 is a cross-sectional view taken along line EE of FIG. FIG. 17 is a right side view of the bass reflex duct. 18 is a cross-sectional view taken along line FF in FIG.

Hereinafter, the present invention records information such as music, video and images input from a personal computer, hard disk, TV, etc., and information such as music, video and images input via a network etc. in an internal memory. An embodiment applied to the so-called “sound bar”, which is a so-called “sound bar” that outputs audio from the built-in

speakers

12 and 12 and can be displayed on a display means such as an externally connected television or personal computer display will be described. The present invention is not limited to a sound bar, and can of course be applied to a speaker device or other audio equipment including the configuration of the present invention.

FIG. 1 is a perspective view of an audio device 10 according to an embodiment of the present invention. As shown in FIG. 1, it can be configured in a horizontally long shape. In the figure, the front side (front side in FIG. 1) of the acoustic device 10 has a shape that is enlarged in the width direction as compared to the back side.

FIG. 2 is an exploded perspective view of the acoustic device 10. The acoustic device 10 can be configured by housing main components in a housing 20 made of an integrally molded product of resin. As shown in FIGS. 1 and 2, the housing 20 has a horizontally long shape, and the front side is enlarged in the width direction as compared with the back side.

A power display unit (LED) 15 and a volume operation unit 16 are provided on the upper surface of the housing 20. The volume operation unit 16 can be a touch panel type operation unit, and can be adjusted by touching the vicinity of the volume operation unit 16.

As shown in FIGS. 2 and 3, the housing 20 has an open bottom surface and is closed by a bottom plate 21 on the bottom surface. The bottom plate 21 can be attached to the housing 20 by screwing or the like.

The front surface of the housing 20 has a front wall 22 in which speaker holes 23 into which the speakers 12 are fitted are opened on the left and right. The front wall 22 may have a lattice shape, and an opening 24 is formed between the

speaker holes

23, 23. The opening 24 is closed by an auxiliary front wall 25 having the same rectangular shape as the opening 24. By forming the opening 24 between the

speaker holes

23, 23, it is possible to install the power supply display unit 15 and the sound volume operation unit 16 and the terminal box 17 described later from the opening 24.

Also, a bass reflex duct opening 27 through which a later-described bass reflex duct 70 protrudes is formed on one side surface of the housing 20. Reference numeral 71 in FIG. 2 is an annular decorative plate that covers the outer periphery of the front end of the bass reflex duct 70.

The housing 20 accommodates

speakers

12 and 12, a bass reflex duct 70, and a substrate 14 on which electronic components are mounted. The substrate 14 can be attached to the bottom plate 21.

The board 14 has electronic parts such as tuners and amplifiers for outputting audio from the

speakers

12 and 12, a terminal box 17 having terminals for connection to a commercial power source and external connection, and input video and audio. Electronic components necessary for all operations, control, and the like related to the acoustic device 10 are mounted, such as a memory to be stored and a decoder that outputs input information to an output device such as a television or a personal computer. In addition, the terminal of the terminal box 17 is installed so that it may protrude on the back side of the housing 20.

As described above, the bottom surface of the housing 20 is opened and the bottom surface of the housing 20 is closed by attaching the substrate 14 to the bottom plate 21, thereby providing the following advantages.

Since the substrate 14 can be attached to the bottom plate 21 in advance, it is easier to assemble than when the front surface is opened and the substrate 14 is inserted into the housing 20 and fixed.

In addition, when the front surface of the housing 20 is opened and then closed separately with a panel, screwing bosses are provided on the top surface, side surface and / or bottom surface of the housing 20, and sound leakage from the outer periphery of the panel is prevented. It is necessary to provide a sealing groove or the like for prevention, but if the configuration is to attach the bottom plate 21, it is only necessary to provide a boss only on the side surface, the upper surface and the bottom surface of the housing 20 can be thinned, The acoustic device 10 can be reduced in thickness and improved in design. There is also an advantage that the number of parts can be reduced.

As shown in FIGS. 1 and 2, a speaker grill 30 covering the front surface of the housing 20 is attached to the front surface of the housing 20. The speaker grill 30 includes a grill frame 40 and a covering material 60 that covers the front surface of the grill frame 40.

4 and 5 are perspective views of the grill frame 40. FIG. The grill frame 40 can be made of resin, and includes an outer frame 41 that forms an outer periphery. The outer frame 41 is suspended by one or a plurality of

ribs

50 and 50.

As shown in FIGS. 4 and 6, the outer frame 41 is formed with a first covering material mounting recess 42 that is recessed so as to go around the front side. The first covering material mounting recess 42 is desirably formed on the inner peripheral side of the outer frame 41 so as to be a stepped portion lower than the outer peripheral side.

As shown in FIG. 7, a plate-shaped covering material 61 having a large number of holes such as punching metal is mounted on the first covering material mounting recess 42 as shown in FIG. The plate-shaped covering material 61 can be made of metal or resin, and can be colored, letters, or designs as desired.

As shown in FIG. 8, the plate-shaped covering material 61 can be attached to the first covering material mounting recess 42 by a double-sided tape 62 or an adhesive.

FIG. 9 is a perspective view of the speaker grill 30 in which the plate-like covering material 61 is mounted on the grill frame 40. By mounting the plate-shaped covering material 61 on the grill frame 40, the grill frame 40 leaves the outer periphery of the outer frame 41 and the front surface is covered with the plate-shaped covering material 61.

Further, as shown in FIGS. 5 and 6, the outer frame 41 is formed with a second covering material mounting recess 43 that is recessed so as to go around the back side. The second covering material mounting recess 43 can be formed with an interval from the outer periphery of the outer frame 41.

As shown in FIG. 10, a cloth-like covering material 63 such as a mesh-shaped saran net (jersey net) is attached to the second covering-material mounting recess 43 as shown in FIG. The cloth-like covering material 63 can be selected from various colors as desired, and can be provided with characters and patterns.

As shown in FIG. 11, the cloth-like covering material 63 covers from the front side of the grill frame 40, extends the peripheral edge to the back surface of the outer frame 41, and is thermocompression-bonded or adhered to the second covering material mounting recess 43. It is attached by.

When the cloth-like covering material 63 is attached by thermocompression bonding, a protrusion 44 that is raised from the other portion of the bottom surface as shown in FIG. As shown in FIG. 11, the bonding strength between the second covering material mounting recess 43 and the cloth-like covering material 63 can be increased by melting the protrusion 44 at the time of crimping, and the cloth-like covering material 63. Can be prevented from peeling.

FIG. 12 is a perspective view of the speaker grill 30 in which the cloth-like covering material 63 is mounted on the grill frame 40. By attaching the cloth-like covering material 63 to the grill frame 40, the grill frame 40 is in a state where the front surface and the outer periphery are all covered with the cloth-like covering material 63.

As described above, the grill frame 40 can be shared by selecting and mounting either the plate-shaped coating material 61 or the cloth-shaped coating material 63 as the coating material 60 on the grill frame 40. Can be planned. Moreover, since the plate-shaped covering material 61 and the cloth-shaped covering material 63 can be selected and mounted on the grill frame 40 as desired, the design variations of the speaker grill 30 can be diversified, and the design of the acoustic device 10 can be improved. Can be increased.

The rib 50 suspended between the outer frames 41 of the grill frame 40 is for preventing deformation and breakage of the covering material 60 when a finger or a foreign object hits the covering material 60.

As shown in FIGS. 4 and 5, the rib 50 is configured such that the position facing the

speakers

12, 12 is a punched hole 51 having a shape similar to that of the speaker 12, and the other portions of the rib 50 are rectangular or the like. It is desirable to have a lattice shape. By making the portions other than the positions facing the

speakers

12 and 12 into a punched shape, it is possible to achieve a reduction in component costs and a reduction in the weight of the grill frame 40.

The rib 50 has at least a cross-sectional shape on the back side as shown in FIG. As a result, it is possible to prevent the sound output from the speaker 12 from hitting the rib 50 and reflecting it, and to enhance acoustic effects such as the spread of sound output from the speaker 12 and sound omission.
The rib 50 has a curved cross-sectional shape, and the curved portion does not need to be a perfect circle, but may be an elliptical shape. Moreover, it can also be set as the spindle shape where the back side of the rib 50 was pointed. Although the acoustic effect is slightly inferior, only the peripheral surface from the back surface to the side surface of the rib 50 may be curved, and a straight portion may remain on a part of the back surface of the rib 50.

The speaker grill 30 having the above configuration is attached to the front surface of the housing 20.
As shown in FIG. 5, the speaker grill 30 can employ a frame mounting structure that is attached to the housing 20 by inserting a boss 52 projecting from the grill frame 40 into a fitting hole 26 formed in the housing 20. . In the drawing, a fitting hole 26 is formed in the front wall 22 of the housing 20 and the auxiliary front wall 25 attached to the front wall 22.

FIG. 14 is an enlarged perspective view of the boss 52 projecting from the grill frame 40. As shown in the figure, the boss 52 has a cylindrical wall surface 53 protruding from the rear surface of the grill frame 40 toward the housing 20, and the cylindrical wall surface 53 faces in the protruding direction. One or a plurality of slits 54 are cut out.

Further, the boss 52 is provided with a reinforcing rib 55 projecting from one or a plurality of locations on the outer periphery of the cylindrical wall surface 53 and the back surface of the grill frame 40. The reinforcing rib 55 is desirably provided with a draft in a direction in which the outer periphery is reduced from the back side to the tip side of the grill frame 40.

The shape of the boss 52 includes the cylindrical wall surface 53 having the slit 54 and the reinforcing rib 55 as described above, so that when the boss 52 is fitted into the fitting hole 26 of the housing 20, The outer peripheral surface hits the inner surface of the fitting hole 26, and the boss 52 enters the fitting hole 26 while bending the cylindrical wall surface 53 inward.

When the outer peripheral surface of the reinforcing rib 55 hits the fitting hole 26, the insertion resistance can be reduced as compared with the case of contact with the surface. Further, by providing a draft angle on the outer periphery of the reinforcing rib 55, even if the boss 52 or the fitting hole 26 has a size variation, the reinforcing rib 55 has a reduced diameter at the tip. 26 is easy to fit.

Furthermore, since the cylindrical wall surface 53 is provided with the slits 54, the cylindrical wall surface 53 can be provided with a spring property. Therefore, the cylindrical wall surface 53 is bent inward when the boss 52 is inserted, and the fitting hole 26 is surely fitted. The reinforcing rib 55 can be brought into contact.

Therefore, it is possible to prevent the situation where the boss 52 does not fit into the fitting hole 26, the situation where the boss 52 cannot be removed even if it is fitted, and the play is large and rattled or easily detached. In addition, since the boss 52 has the above-described configuration, the speaker grill 30 can be easily attached to and detached from the housing 20, so that it is easy to maintain.

FIG. 15 is a perspective view of the bass reflex duct 70 housed in the housing 20 as shown in FIG. The bass reflex duct 70 has a cylindrical portion 72 that communicates the inside of the housing 20 and the outside of the housing 20, and is disposed on the back side of the

speakers

12, 12 to reduce the sound generated from the rear surfaces of the

speakers

12, 12. The sound range is amplified by Helmholtz resonance and output to the outside.

Since the bass reflex duct 70 communicates with the inside and outside of the housing 20 as described above, if foreign matter enters the housing 20 from the bass reflex duct 70, the acoustic device 10 may malfunction or break down. Therefore, a lattice frame 73 is provided in the cylindrical portion 72 of the bass reflex duct 70 as shown in FIG.

The lattice frame 73 can be configured by connecting a plurality of housings 74, and at least the inside of the housing 20 has a cross-sectional curved shape as shown in FIGS. As a result, it is possible to prevent the sound passing through the bass reflex duct 70 from being reflected by the housing 74 and to enhance acoustic effects such as the spread of sound output from the bass reflex duct 70 and sound omission.
Furthermore, as shown in FIG. 17, the casing 74 has a shape similar to the inner peripheral shape of the opening 75, so that further sound omission can be improved and wind noise can be reduced.

In FIG. 18, the housing 74 has a spindle shape in which both the inner side and the outer side of the housing 20 are curved in cross section.

The shape of the curved section of the casing 74 does not have to be a perfect circle, and may be an elliptical shape. Also, a spindle shape as shown in FIG. 18 may be used. With such a structure, the spindle shape has a better acoustic effect because the air flow is better than that of a perfect circle. In addition to the spindle type, the acoustic effect is slightly inferior, but only the peripheral surface from the back surface to the side surface of the housing 74 is curved, and a straight portion remains on a part of the back surface of the housing 74, or the length of the bass reflex duct 70 is long. It does not matter as a rectangular parallelepiped shape having long sides in the direction.

The lattice frame 73 can be attached to the bass reflex duct 70 by inserting the lattice frame 73 from a notch (not shown) formed on the side surface of the bass reflex duct 70. Further, the bass reflex duct 70 may be divided in the longitudinal direction or the radial direction, and the lattice frame 73 may be sandwiched. Further, the bass reflex duct 70 may be divided in the longitudinal direction, and the lattice frame 73 may be integrally formed on one end face.

In any case, it is preferable that the installation position of the lattice frame 73 is a position away from the opening 75 on the outside of the bass reflex duct 70, and the inner center of the bass reflex duct 70 in the longitudinal direction or substantially in the center. It is desirable to be close to the opening 76 on the side. This is because if the lattice frame 73 is installed in the vicinity of the opening 75 on the outer side of the bass reflex duct 70, since the air enters and exits heavily, a wind noise may be generated.

By adopting the bass reflex duct 70 in the acoustic device 10, the acoustic effect of the sound output from the bass reflex duct 70 can be enhanced as much as possible.

The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

For example, the speaker grill 30 and the audio device 10 are not limited to the above-described and illustrated external shapes. Moreover, the structure and function of the audio equipment 10 are not limited to the above. Furthermore, the present invention can be applied not only to the acoustic device 10 but also to a speaker device in which the acoustic device 10 includes a part of its configuration and functions.

Further, the cylindrical portion 72 of the bass reflex duct 70 does not need to be a straight pipe, and may have a shape that expands toward the outside of the housing 20 or a bent shape. Furthermore, you may make it open not on the side surface of the housing | casing 20, but the front surface, an upper surface, a bottom face, etc.

The present invention is useful as a bass reflex duct capable of improving the acoustic effect, and a speaker device and an acoustic device including the bass reflex duct.

DESCRIPTION OF SYMBOLS 10 Audio equipment 12 Speaker 20 Housing 21 Bottom plate 30 Speaker grill 40 Grill frame 41 Outer frame 42 First covering material mounting recess 43 Second covering material mounting recess 50 Rib 52 Boss 60 Covering material 61 Plate-shaped covering material 63 Cloth-like Covering material 70 Bass reflex duct 73 Lattice frame

Claims

A bass reflex duct that is arranged in a housing containing a speaker and has a cylindrical portion that communicates the inside and outside of the housing,
In the cylindrical portion, a lattice frame formed by connecting the casings having a curved cross section on the inner side of the casing is disposed.
Bass reflex duct.
The bass reflex duct according to claim 1, wherein the lattice frame is disposed at a distance from an opening on the outside of the cylindrical portion.
Speakers,
A housing containing the speaker;
A bass reflex duct for outputting sound generated from the back side of the speaker;
A speaker device comprising:
The bass reflex duct according to claim 1 or claim 2 is used as the bass reflex duct.
Speaker device.
An audio device comprising the speaker device according to claim 3.