JP4657615B2 - Sound diffusion device - Google Patents

Description

  The present invention relates to a sound wave diffusing device, and more particularly to a sound wave diffusing device that realizes a sound field effect in a small-scale space.

Various attempts have been made with the aim of providing a so-called sound field effect in which sound image localization is dispersed by controlling the spread of sound radiated from a speaker into the room according to the shape of the room.
The most common practice is to install a speaker with the sound wave emitting surface facing the indoor ceiling. When the sound wave emitting surface of the speaker is directed to the ceiling, most of the sound radiated from the speaker creates a virtual image of sound when passing through the ceiling, and an effect of adding reverberant sound is obtained.
On the other hand, an attempt has been made to install a special function for diffusing sound in the speaker itself, instead of matching the arrangement of the speaker to the indoor shape. As a document disclosing a speaker equipped with this kind of function, for example, there is Patent Document 1.
In the diffuser disclosed in this document, a support member extending in the vertical direction is fixed to the front surface of the speaker, and each end of a pair of rectangular diffusion plates is attached so that the support member can be rotated about a rotation axis. It is attached to the support member. According to this diffuser, the sound wave radiated from the speaker can be diffused to the side of the speaker via the back surfaces of the two diffusion plates. In addition, since both diffuser plates are pivotally attached using a support member on the front surface of the speaker as a rotation axis, it is possible to appropriately adjust the inclination so that the sound spread is best.
Japanese Utility Model

However, it is pointed out that the conventional method as described above is not suitable for use in a small space. In general, the speaker has a substantially rectangular parallelepiped shape, so if it is placed as it is facing the ceiling, the sound wave radiation surface and the ceiling will face each other in parallel, and many of the sounds radiated toward the ceiling After being reflected by the ceiling, it reaches the listener without passing through other wall surfaces in the room. However, in a small-scale space where the distance from the speaker to the ceiling is short, the sound image of the primary reflected sound reflected on the ceiling can be heard strongly, so the sound image of the sound radiated from the speaker is localized on the speaker, and the natural reverberation sound There is a problem that is hindered. Further, it has been pointed out that the reflected wave reflected from the ceiling and the direct wave radiated from the speaker interfere with each other to cause a peak dip at a specific frequency and cause coloration.
On the other hand, the sound wave emitting surface of the loudspeaker is set to ensure a sufficient path length (propagation distance) by making the incident angle so that the sound reflected by the ceiling reaches the listener after passing through other wall surfaces. Although some attempts have been made to place the camera at a slight tilt with respect to the ceiling, most speakers do not have a function to adjust the tilt angle. It is not cumbersome to perform the work of fixing the speaker in the room while holding the lamp.
On the other hand, in the case of a speaker equipped with a diffuser as disclosed in Patent Document 1, it is relatively easy to adjust the incident angle to the ceiling, and demerits when installing in a small-scale space can be avoided. However, in reality, there are very few speakers equipped with such an expander. Therefore, when it is desired to achieve a sufficient sound field effect in a small-scale space, a speaker to be installed in a room is selected from extremely limited options. I had to choose.
The present invention has been devised under such a background, and even when any type of speaker is arranged in a small-scale space, a good sound field can be obtained by using it in combination with the speaker. An object of the present invention is to provide a sound wave diffusing device capable of realizing the effect.

Acoustic diffuser is a preferred embodiment of the present invention comprises a strut having one end pivotally attached to the side of the speaker which is fixed to the chamber wall via a support rod, is more supported on the other end of the prior SL strut, the a sound wave spreading device equipped with a sound wave diffuser for diffusing the sound waves radiated toward the listener from the sound wave emitting surface of the speaker upward and downward of the indoor, the ultrasonic diffuser before Kion wave radiation The angle of inclination with respect to the surface is adjustable, and is supported so as to be movable between a position of the sound wave radiation area of the speaker and a position outside the sound wave radiation area, and the sound wave diffuser faces the sound wave radiation surface of the speaker. It is characterized by being formed of a member curved toward the sound wave emitting surface so that the surface has a convex shape .

  According to the present invention, a suitable sound field effect can be realized by diffusing sound waves emitted from a speaker. Moreover, it can be used in combination with any type of speaker.

(First embodiment)
The first embodiment of the present invention will be described below. The sound wave diffusing device according to this embodiment can be used in combination with speakers of various sizes and shapes, and the feature is that it is good by diffusing sound waves emitted from the speakers. It is in the point which gives a sound field effect.
FIG. 1 is a front view showing a sound wave diffusing device according to the present embodiment. FIG. 2 is a side view showing the sound wave diffusing device.
As shown in the figure, the sound wave diffusing device includes a speaker mounting table 10, a sound wave diffusing body 20, and two support columns 30 attached so as to sandwich them.
The speaker mounting table 10 is formed of a plate-like member, and is provided with an insertion hole 11 penetrating from a position below the center of the left end face toward a position below the center of the right end face.
The acoustic diffuser 20 is formed of a plate-like member, and is provided with insertion holes 21 and 22 penetrating from the left end face toward the right end face.
On the other hand, each of the support columns 30 has a rectangular column 32 standing upright at the rear end of a substantially rectangular parallelepiped base 31, and a diffuser is provided in a hanging hole 33 provided from the upper end to the middle of the rectangular column 32. A part of the support portion 34 is suspended. The diffuser support portion 34 is formed by connecting the rod bodies 34 a and 34 b, and a part of the rod body 34 b is suspended in the hanging hole 33. A rod (not shown) is provided at the lower end of the rod 34b, and the rod 34b is prevented from being pulled out by locking the rod near the upper end of the hanging hole 33 of the rectangular column 32. A stopper (not shown) protrudes. The distance (height) from the lower end of the quadrangular column 32 to the diffuser support 34 can be freely expanded and contracted by displacing the position of the suspended rod body 34b in the vertical direction along the suspended hole 33. it can. Further, the connecting portion 34c of the rod body 34a and the rod body 34b is latched by a hinge mechanism, whereby the rod body 34a is rotatable in the front-rear direction with the connecting portion 34c as a fulcrum. In the following description, of the surfaces constituting the acoustic diffuser 20, the surface facing upward when the connecting portion 34c of the column 30 is rotated forward is referred to as the “surface”, and the column 30 The surface that faces downward when the connecting portion 34c of this is rotated in the forward direction is referred to as a “back surface”.

On the rod bodies 34a of both support columns 30 that sandwich the acoustic wave diffusing body 20, housings 35 and 36 are provided inwardly. The interval between the casings 35 and 36 is the same as the interval between the insertion holes 21 and 22 provided in the sound wave diffuser 20. Then, both struts 30 are partially inserted into the insertion holes 21 and 22 of the sound diffusing body 20 by inserting the casings 35 and 36 provided on the respective diffusing body support portions 34, near the upper end of the sound diffusing body 20. And the lower end is supported from both the left and right sides. Moreover, the base part 31 of both the support | pillar parts 30 is each provided with the housing 37 toward the inner side. Both struts 30 are connected to the speaker mounting table 10 by partially inserting a housing 37 provided on each base portion 31 into the insertion hole 11 of the speaker mounting table 10.
The ends of the casings 35 to 37 of the support column 30 are provided with not-shown saddles, near the left and right ends of the insertion holes 21 and 22 of the sound wave diffuser 20, and near the left and right ends of the insertion hole 11 of the speaker mounting table 10. Is provided with a stopper (not shown) that prevents the rod from being pulled out by locking the rod. The distance between the two struts 30 that sandwich the acoustic diffuser 20 can be freely expanded and contracted by displacing the position of the inserted casing in the left-right direction along the insertion hole.

Next, a procedure for installing the sound wave diffusing device according to the present embodiment in a room will be described.
FIG. 3 is a flowchart showing an installation procedure of the sound wave diffusing device.
The installer of the sound wave diffusing device (hereinafter referred to as “installer”) first selects a speaker to be used with the sound wave diffusing device in the room (S100).
Subsequently, the installer adjusts the height of both struts 30 of the sound wave diffusing device and the distance between both struts 30 so as to match the size of the selected speaker (S110). Specifically, the position of the bar 34b of the support column 30 is displaced so that the distance between the sound wave diffuser 20 and the speaker mounting table 10 is larger than the distance from the front surface to the back surface of the speaker, and both the support columns 30 are provided. The positions of the casings 35 to 37 are displaced so that the distance between them becomes larger than the distance from the upper surface to the lower surface of the speaker.

The installer installs the sound wave diffusing device at a predetermined position in the room (S120). The installation position and orientation in the room are arbitrarily determined by the installer according to the shape of the room.
The installer places the speaker on the speaker mounting table 10 of the installed sound diffusing device (S130). At this time, the speaker must be placed with the sound wave emitting surface on the front surface thereof facing the sound wave diffusing body 20 of the sound wave diffusing device.

Finally, the installer adjusts the inclination angle of the sound diffuser 20 with respect to the sound wave emitting surface (S140). The inclination angle of the sound diffuser 20 is adjusted in consideration of the shape of the room and the naturalness of the sound field to be realized in the room.
The adjustment of the inclination angle of the sound wave diffuser 20 will be further described.
For example, it is assumed that the sound wave diffusing device is installed in a general small-scale space as shown in FIG. As shown in the figure, this small-scale space includes a ceiling C, a floor F, a right wall RW, and a left wall LW, and on the shelf R provided on the right wall RW, sound wave diffusion. A sound wave diffusing device is installed with the surface of the body 20 facing the right wall RW, and a speaker S is mounted on the speaker mounting table 10.
In this figure, when the inclination angle of the sound wave diffuser 20 is set to θl, most of the sound waves radiated from the speaker S follow a path as indicated by L. That is, after being reflected by the ceiling C, it reaches the listener on the floor F without passing through the left wall LW.
When the inclination angle of the sound wave diffusing body 20 is set to θm, which is sharper than θl, most of the sound waves radiated from the speaker S follow a path as indicated by M. That is, after being reflected by the ceiling C, it is once reflected by the left wall LW and then reaches the listener on the floor F. In this case, the path length becomes longer than the inclination angle θl, so that the level of sound emitted from the speaker at the listening position becomes smaller than the level of diffused sound in the room. Thereby, the impression that sound is emitted from the speaker is weakened, and a reverberant sound better than the inclination angle θ1 can be added.
FIG. 4 illustrates a case where the surface of the sound wave diffuser 20 is installed facing the right wall RW. Of course, the back surface of the sound wave diffuser 20 may be installed facing the right wall RW.

As described above, the sound wave diffusing device according to the present embodiment supports the sound wave diffusing body 20 formed of a plate-like member from the left and right sides by the two support columns 30, and further the support columns 30. The angle of inclination of the sound wave diffuser 20 can be freely adjusted. Therefore, a sound field effect can be provided regardless of the shape of the room by installing the sound wave diffusing device together with the speaker in a room and suitably controlling the spread of the sound radiated from the speaker. .
Moreover, the support | pillar part 30 which supports the sound wave diffuser 20 can extend / contract the distance (height) from the speaker mounting base 10 to the sound wave diffuser 20, and can also extend / contract the distance between both the support | pillar parts 30 also. It has become. For this reason, it can be used in combination with a speaker of any size.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment, the sound wave diffusing body 20 is formed only by a plate-like member. On the other hand, in the present embodiment, the sound diffuser 20 is bent toward the sound wave emitting surface of the speaker.
FIG. 5 is a front view of the sound wave diffusing device according to the present embodiment, and FIG. 6 is a side view of the same device. As shown in both drawings, the sound wave diffusing device according to the present embodiment includes a curved diffuser 20 a disposed in front of the back surface of the sound diffuser 20. The curved diffuser 20 a has a back surface curved into a shape that coincides with an arc of a quarter circle centering around the vicinity of the upper end of the sound wave diffuser 20. The lower end of the curved diffuser 20 a is joined to the vicinity of the lower end of the back surface of the sound wave diffuser 20. Further, the surface of the curved diffuser 20a is supported in the vicinity of the center of the back surface of the sound wave diffuser 20 via a rod-shaped reinforcing member 20b.
By adopting the configuration as described above, the sound wave emitted from the speaker is reflected so as to spread on the curved surface, so that a higher diffusion effect is exhibited.

(Third embodiment)
A third embodiment of the present invention will be described. In the present embodiment, similarly to the second embodiment, the sound wave diffuser 20 is bent toward the sound wave emitting surface of the speaker.
FIG. 7 is a front view of the sound wave diffusing device according to the present embodiment, and FIG. 8 is a side view of the device. Similar to the second embodiment, this sound diffusing device also includes a curved diffuser 20c disposed in front of the back surface of the sound diffuser 20. However, the curved diffuser 20c is not only curved in the vicinity of the substantially center of the back surface thereof in a shape coinciding with the arc of a quarter circle centering on the vicinity of the upper end of the sound wave diffuser 20, and further, both side surfaces thereof are spherical. Is curved. The lower end of the center of the curved diffuser 20 c is joined to the vicinity of the lower end of the back surface of the acoustic diffuser 20. Further, the surface of the curved diffuser 20c is supported near the center of the back surface of the sound wave diffuser 20 via the reinforcing member 20d.
By adopting the configuration as described above, the reflection of sound waves at the spherical portions on both side surfaces becomes more spread, and a high diffusion effect can be expected.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. The speaker equipped with the sound wave diffusing device according to the present embodiment can serve both as a speaker that supports the sound field effect and as a speaker that supports the surround effect.
Surround means creating a sound image at a specific position in a room by linking a plurality of speakers, so that it is difficult to achieve a sufficient effect if sound waves emitted from the speakers are diffused. In order to avoid such an inconvenience, the sound wave diffusing device according to the present embodiment is supported so that the sound wave diffusing body can rotate from a position facing the sound wave emitting surface of the speaker to a position facing the side surface of the speaker. It has become a structure.
FIG. 9 is a diagram showing a state of the sound wave diffusing device according to the present embodiment in the sound field support mode, and FIG. 10 is a diagram showing a state of the device in the surround mode. This sound wave diffusing device is provided on a speaker S fixed to the right wall RW in the room via a speaker support bar 40. Two substantially semicircular sound wave diffusers 41 curved toward the speaker S are provided. The two support portions 42 are sandwiched from both left and right sides by one end. On the other hand, the other ends of the support portions 42 are pivotally attached to holes (not shown) provided near the center of the left and right side surfaces of the speaker S, and the sound diffusing body 41 and the support portion 42 rotate around the pivoted portion as a fulcrum. It is free to move. That is, the support portion 42 supports the sound wave diffusing body 41 so as to be movable between the position of the sound wave radiation area of the speaker and the position outside that area.
In the sound field support mode, the sound wave diffuser 41 is set at a position facing the sound wave radiation surface X of the speaker S. As a result, most of the sound waves radiated from the sound wave radiation surface X of the speaker S are diffused upward and downward through the sound wave diffuser 41, so that a good sound field effect is obtained.
On the other hand, in the surround mode, the sound wave diffuser X is rotated to a position facing the upper side surface of the speaker S. Thereby, the sound wave emitted from the sound wave emitting surface X of the speaker S is not diffused by the sound wave diffuser 41, and a good surround effect is obtained.

(Fifth embodiment)
A fifth embodiment of the present invention will be described. The sound wave diffusing device according to the first to third embodiments includes a speaker mounting table 10 and is used together with a speaker mounted on the mounting table to realize a sound field effect. On the other hand, in this embodiment, the sound wave diffusing device is fixed to the wall surface of the room.
FIG. 11 is a diagram illustrating a state in which the sound wave diffusing device according to the present embodiment is installed. In the figure, the speaker S is placed on the shelf R provided on the right wall RW in the room with the sound wave radiation surface X facing upward. The sound wave diffuser 43 is fixed to the indoor right wall RW via the support portion 44. The sound wave diffuser 43 has a substantially semicircular cross section curved toward the sound wave radiation surface X of the speaker S, and the support portion 44 that fixes the sound wave diffuser 43 to the right wall RW extends from the right wall RW. The rod body 44 b is suspended from the left end of the horizontally disposed rod body 44 a, and the lower end of the rod body 44 b is joined to the sound wave diffusing body 43.
FIG. 12 is a diagram showing a state in which another sound diffusing device according to the present embodiment is installed. In the figure, the speaker S is fixed to the right wall RW via a speaker support bar 45. Two support portions 46 are erected on the right wall RW so as to sandwich the speaker S, and both the support portions 46 sandwich the sound diffusing body 47 at a position facing the sound wave emitting surface X of the speaker S. ing. Each of the support portions 46 is formed by connecting the rod body 46a and the rod body 46b by a hinge mechanism (not shown), and the sound wave diffusing body 47 and the rod body 46b are rotatable about the connection portion. For this reason, the speaker S used in combination with the sound wave diffusing device can also serve as a speaker that supports the sound field effect and a speaker that supports the surround effect, as in the fourth embodiment. .

(Other embodiments)
The present invention can be modified in various ways.
In the above embodiment, the shape of the sound wave diffuser provided in the sound wave diffusing device is a plate shape or a substantially semicircular shape, but the sound wave diffuser may be formed by other shapes. FIG. 13 and FIG. 14 show the shape of a sound wave diffuser as a preferred modification. FIG. 13 is a side view of a sound wave diffusing body according to this modification, and FIG. 14 is a sectional structural view thereof. As shown in both figures, by arranging irregular irregularities over the entire surface of the sound diffuser directed to the speaker, a high frequency sound wave is emitted from the speaker and a low frequency sound wave is emitted. A similar scattering effect can be achieved regardless of the case.
Although the sound wave diffusing device according to the first embodiment includes the speaker mounting table 10, the speaker is mounted directly on the surface on which the base portions 31 of the two support columns 30 are installed without providing such a mounting table. The sound wave emitted from the sound wave emitting surface may be diffused using a sound wave diffusing device.
In the fourth embodiment, the position of the sound diffuser is moved from the sound wave radiation area of the speaker to the outside of the speaker by rotating the support portion that supports the sound diffuser. It may be realized by a mechanism or a panda graph mechanism. In this case, the setting position of the sound diffusing body is not limited to two positions: a position facing the sound wave emitting surface of the speaker and a position facing the side surface thereof. For example, by finely adjusting the position of the sound wave diffuser within the sound wave radiation area, it may be possible to optimize the method of sound wave diffusion.

It is a front view showing a sound wave diffusing device (first embodiment). 1 is a side view showing a sound wave diffusing device (first embodiment). It is a flowchart which shows the installation procedure of a sound diffusing device. It is a figure which shows the installation aspect of a sound wave diffusing device. It is a front view which shows a sound wave diffusing device (2nd Embodiment). It is a side view which shows a sound wave diffusing device (2nd Embodiment). It is a front view which shows a sound wave diffusing device (3rd Embodiment). It is a side view which shows a sound wave diffusing device (3rd Embodiment). It is a figure which shows the installation state of a sound wave diffusing device (4th Embodiment). It is a figure which shows the installation state of a sound diffusing device (4th Embodiment). It is a figure which shows the installation state of a sound wave diffusing device (5th Embodiment). It is a figure which shows the installation state of a sound wave diffusing device (5th Embodiment). It is a side view of a sound wave diffuser (modification). It is sectional drawing of a sound wave diffuser (modification).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Speaker mounting base, 11, 21, 22 ... Insertion hole, 20, 41, 43, 47 ... Sound diffusing body, 30 ... Support | pillar part, 31 ... Base part, 32 ... Square column body, 33 ... Droop hole, 34 ... Diffuser support part, 35, 36, 37 ... housing, 42, 44, 46 ... support part

Claims (1)

A column having one end pivotally attached to the side surface of the speaker fixed to the indoor wall via a support bar ,
A previous SL is more supported on the other end of the strut, acoustic diffuser that includes a sound wave diffuser for diffusing the sound waves radiated toward the listener upward and downward of the chamber from the sound wave emitting surface of the speaker ,
The acoustic diffuser, front inclined angle with respect to Kion wave radiation surface is adjustable, and is movably supported between the positions of the outside of the sound wave emission region of the sound wave radiating area of the speaker,
The sound wave diffusing device, wherein the sound wave diffuser is formed of a member curved toward the sound wave emitting surface so that a surface facing the sound wave emitting surface of the speaker has a convex shape.

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