CN111741384A

CN111741384A - Loudspeaker system

Info

Publication number: CN111741384A
Application number: CN201911265061.XA
Authority: CN
Inventors: 鴫原显英
Original assignee: JVCKenwood Corp
Current assignee: JVCKenwood Corp
Priority date: 2019-03-25
Filing date: 2019-12-11
Publication date: 2020-10-02
Also published as: JP7200788B2; JP2020161855A

Abstract

The invention provides a speaker system, which can make a perforated net exert expected anti-ball performance under the condition of not influencing the directional characteristic of a directional horn. The directional horn (33) attaches a first directional angle (theta A) to sound emitted from the middle tweeter (32) in a first direction (D1), and attaches a second directional angle (theta B) narrower than the first directional angle (theta A) in a second direction (D2) orthogonal to the first direction (D1). The directional horn (33) is mounted on the front baffle (3). The perforated net (4) is integrally formed with the front baffle (3) or is mounted on the front baffle (3) separately from the front baffle (3). The reinforcing member (56) is disposed in contact with a back surface (57) of the perforated web (4), the back surface (57) being a surface on the side opposite to the directional horn (33), and extends along the first direction (D1).

Description

Loudspeaker system

Technical Field

The present invention relates to a speaker system.

Background

When the speaker system is used in a gym or an indoor sports facility, a speaker system having a basket surrounding the speaker system or a ball-blocking structure is used, assuming that a basketball, a volleyball, or the like collides with the speaker system.

The speaker system having the ball-preventing structure has a relatively strong frame and mounting structure so that no malfunction or damage occurs even if a ball is directly hit. In such a speaker system, a perforated metal mesh may be disposed in an opening of a speaker unit so as not to be largely deformed.

In addition, from the viewpoint of general use of parts, rust prevention, or reduction in manufacturing cost, a perforated mesh made of resin may be disposed in an opening portion of the speaker unit in the speaker system as described above.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-124593

Disclosure of Invention

In order to satisfy the desired pilling resistance performance only by the strength of the perforated web, the thickness of the perforated web in the depth direction needs to be made thick. However, since the depth of the holes in the perforated mesh is also increased, the directivity characteristic of the directional horn is corrected by the perforated mesh, and the target directivity characteristic may not be achieved.

The invention aims to provide a loudspeaker system which can enable a perforated net to exert expected anti-ball performance without influencing the directional characteristic of a directional horn.

The present invention provides a speaker system comprising: a speaker; a directional horn that attaches a first directional angle to a sound emitted from the speaker in a first direction and attaches a second directional angle narrower than the first directional angle in a second direction orthogonal to the first direction; the front baffle is provided with the directional loudspeaker; a perforated net formed integrally with the front barrier or mounted to the front barrier separately from the front barrier; and a reinforcing member disposed in contact with a face of the perforated web, the face being a face on a side opposite to the directional horn, and extending in the first direction.

Effects of the invention

According to the present invention, it is possible to provide a speaker system in which a perforated mesh exhibits a desired anti-roll performance without affecting the directivity characteristics of a directional horn.

Drawings

Fig. 1 is a perspective view of a speaker system according to an embodiment of the present invention;

fig. 2 is a front view of a speaker system according to an embodiment of the present invention;

FIG. 3 is a perspective view of the housing;

FIG. 4 is a front view of the front baffle and perforated web;

FIG. 5 is a rear view of the front baffle and perforated web;

fig. 6 is a perspective view showing a state in which the woofer unit and the midrange-high speaker unit are mounted on the front baffle;

fig. 7 is a plan view showing a state in which the woofer unit and the midrange speaker unit are mounted on the front baffle;

fig. 8 is a side view showing a state in which the woofer unit and the midrange speaker unit are mounted on the front baffle;

FIG. 9 is a perspective view of the directional horn showing a state before the reinforcing member is installed;

fig. 10 is a perspective view of the directional horn showing a state in which the reinforcing member is attached.

Detailed Description

Hereinafter, a speaker system according to an embodiment will be described with reference to the drawings.

In the drawing, arrow UPR indicates the upper side of the speaker system, arrow LWR indicates the lower side of the speaker system, arrow FR indicates the front side of the speaker system, and arrow RR indicates the rear side of the speaker system. In addition, in the drawing, an arrow RH indicates a right side when the speaker system is viewed from the front side, and an arrow LH indicates a left side when the speaker system is viewed from the front side.

As shown in fig. 1 and 2, the speaker system 1 includes a housing 2, a front baffle 3, and a perforated mesh 4. Further, the speaker system 1 includes a woofer unit 5 and a middle tweeter unit 6 (see fig. 6 to 8) accommodated inside the housing 2.

As shown in fig. 3, the housing 2 has a cylindrical peripheral wall portion 11, a rear wall portion 12 closing a rear end of the peripheral wall portion 11, and a housing space portion 13 formed inside the peripheral wall portion 11 to house the woofer unit 5 and the middle-high range speaker unit 6.

The perforated net 4 shown in fig. 4 and 5 constitutes a structure for preventing a ball in the speaker system 1. The perforated web 4 is an integral perforated web 7 formed integrally with the front baffle 3. The perforated web 4 and the front baffle 3 are made of resin.

The perforated web 4 is not limited to the one-piece perforated web 7 formed integrally with the front baffle 3, and may be formed separately from the front baffle 3 and attached to the front baffle 3.

As shown in fig. 4 and 5, the integrated perforated web 7 has a front face 14 and a rear face 15. The integrated perforated web 7 has a first opening portion 16 penetrating the front surface 14 and the rear surface 15, and a second opening portion 17 penetrating the front surface 14 and the rear surface 15. Further, the integrated perforated web 7 has a third opening portion 18 penetrating the front face 14 and the rear face 15. The first opening portion 16 is formed in a circular shape in a rear view, and the second opening portion 17 is formed in a quadrangular shape in the rear view.

The rear surface 15 of the integrated perforated screen 7 is provided with a frame 21 connected to the first opening portion 16 and a reinforcing rib 22 for reinforcing the first opening portion 16 and the frame 21. Further, an outer frame portion 23 connected to the second opening portion 17 and a bass reflex port 24 connected to the third opening portion 18 are provided on the rear surface 15 of the integrated perforated screen 7. The frame portion 21 is formed in a circular shape in a rear view, and the outer frame portion 23 is formed in a quadrangular shape in the rear view.

The integrated perforated web 7 is provided with a plurality of

holes

25 and 26. Although not shown, in the perforated web 4, the thickness of the portion covering the second opening portion 17 in the front-rear direction is formed to be thinner than the thickness of the portion covering the first opening portion 16 in the front-rear direction. That is, the depth of the holes 26 in the portion of the perforated web 4 covering the second opening portion 17 is formed to be shorter than the depth of the holes 25 in the portion covering the first opening portion 16.

In the present embodiment, the thickness of the perforated web 4 in the front-rear direction is preferably 2mm or more and less than 6mm, and more preferably 3mm, for example. The

holes

25 and 26 are regular triangular holes (triangular holes) having a side of, for example, about 7 mm. The thickness of the perforated web 4 in the front-rear direction is 6mm, which greatly affects the directional characteristic of the directional horn 33, but the thickness of the perforated web 4 in the front-rear direction is 3mm, which does not greatly affect the directional characteristic of the directional horn 33. Further, by forming the

holes

25 and 26 as triangular holes (triangular holes), the surface tension of water is less likely to be uniform and water is less likely to accumulate in the

holes

25 and 26 than in circular holes (circular holes).

As shown in fig. 6 and 7, the woofer unit 5 has a woofer 31. The woofer 31 is a so-called woofer, and mainly emits sound in a bass range.

The woofer unit 5 is engaged with and fixed to the frame 21 of the front baffle 3 with an insect-proof net (not shown) for repelling insects interposed between the woofer unit and the perforated net 4. The insect net is formed of, for example, a nonwoven fabric, and the size of the pores of the insect net is smaller than the size of the pores 25 of the perforated net 4.

As shown in fig. 6 to 8, the midrange-high speaker unit 6 has a midrange-high speaker 32 and a directional horn 33. The midrange speaker 32 is a so-called tweeter that mainly emits sound from the middle to the high range. The directional horn 33 is made of resin.

The middle-high-range speaker unit 6 is engaged with and fixed to the outer frame portion 23 of the front baffle 3 with an insect-proof net (not shown) for repelling insects interposed between the middle-high-range speaker unit and the perforated net 4. The insect net is made of, for example, a nonwoven fabric, and the size of the pores of the insect net is smaller than the size of the pores 26 of the perforated net 4.

As shown in fig. 9 and 10, the directional horn 33 has a path length correction collar portion 44. The path length correction neck portion 44 corrects the sound wave path length of the sound emitted from the middle tweeter 32.

Furthermore, the directional horn 33 has a horn portion 45. The horn 45 is configured to add a first directional angle θ a to the sound emitted from the middle tweeter 32 in a first direction D1, and to add a second directional angle θ B narrower than the first directional angle θ a in a second direction D2 orthogonal to the first direction D1 (see fig. 7 and 8).

The horn portion 45 of the directional horn 33 has a right side peripheral wall portion 46 and a left side peripheral wall portion 47, and these right side peripheral wall portion 46 and left side peripheral wall portion 47 have a shape expanding in the first direction D1. The horn 45 is configured to attach a first directivity angle θ a (see fig. 7) to the sound emitted from the middle tweeter 32 in the first direction D1 through the right side peripheral wall portion 46 and the left side peripheral wall portion 47.

The directional characteristic of the horn section 45 of the directional horn 33 as the first direction D1 extends from the center axis CL at an angle θ a1 (see fig. 7) to the right-hand limit LR and the left-hand limit LL, respectively. The angle θ a1 is, for example, 50 °. The spread of the first direction D1 of the sound emitted from the high pitch speaker unit 6 is within the range of the first directivity angle θ a (see fig. 7).

The horn portion 45 of the directional horn 33 has an upper peripheral wall portion 48 and a lower peripheral wall portion 49, and these upper and lower

peripheral wall portions

48 and 49 have a shape expanding in the second direction D2. The horn 45 is configured to impart a second directional angle θ B in the second direction D2 to the sound emitted from the middle tweeter 32 through the upper peripheral wall portion 48 and the lower peripheral wall portion 49 (see fig. 8).

The directional characteristic of the horn portion 45 of the directional horn 33 as the second direction D2 extends from the center axis CL at an angle θ B1 (see fig. 8) to the upper limit LU and the lower limit LB, respectively. The angle θ B1 is, for example, 7.5 °. The sound emitted from the high pitch speaker unit 6 extends in the second direction D2 to a range of the second directional angle θ B (see fig. 8).

The directional horn 33 includes an inner frame portion 51, and the inner frame portion 51 is provided at a front end portion of the directional horn 33 and engages with the outer frame portion 23 of the front baffle 3. The inner frame portion 51 is formed in a quadrangular shape in front view by an upper frame 52, a lower frame 53, a right frame 54, and a left frame 55.

Such a directional horn 33 is mounted on the front baffle 3 (refer to fig. 6 to 8).

The speaker system 1 includes a pair of upper and lower reinforcing

members

56, 56 as shown in fig. 9 and 10. The reinforcing member 56 is in contact with the back surface 57 of the perforated web 4, which back surface 57 is the surface on the side opposite to the directional horn 33, and is arranged to extend along the first direction D1 (see fig. 7). The reinforcing member 56 is constituted by a rod made of metal, for example.

The reinforcing member 56 is attached to the directional horn 33 and contacts a back surface 57 (see fig. 5) of the perforated web 4, and the back surface 57 is a surface facing the directional horn 33.

The right frame 54 of the inner frame portion 51 of the directional horn 33 and the right side peripheral wall portion 46 of the horn portion 45 are formed with accommodating grooves 61 in a pair at an interval in the second direction D2. In addition, the left frame 55 of the inner frame portion 51 of the directional horn 33 and the left peripheral wall portion 47 of the horn portion 45 are formed with accommodating grooves 62 in a pair at an interval in the second direction D2.

These receiving

grooves

61, 62 extend in parallel with the center axis CL (see fig. 8) with respect to the front-rear direction, and have a sufficient depth (groove depth) required for inserting the reinforcing member 56 in the front-rear direction.

The reinforcing member 56 is adhesively fixed to the

housing grooves

61 and 62 in a state of being housed in the

housing grooves

61 and 62, respectively. The fixing of the reinforcing member 56 to the directional horn 33 is not limited to chemical bonding such as adhesion, and may be material bonding such as welding or welding, or mechanical bonding such as screw fixing.

As shown in fig. 10, in a state where the reinforcing member 56 is attached to the directional horn 33, the interval Pa between the pair of upper and lower reinforcing

members

56, 56 is smaller than the vertical length Pb (see fig. 8) of the ball 60 when it is assumed that the ball collides against the perforated net 4. The ball 60 is, for example, a basketball.

In a state where the reinforcing members 56 are attached to the directional horn 33, the distance Pc between the upper frame 52 of the inner frame portion 51 and the upper reinforcing member 56 is substantially equal to the interval Pa between the pair of upper and lower reinforcing members 56.

Further, in a state where the reinforcing member 56 is attached to the directional horn 33, the distance Pd between the lower frame 53 of the inner frame portion 51 and the lower reinforcing member 56 is also substantially equal to the interval Pa between the pair of upper and lower reinforcing members 56.

Further, the reinforcing member 56 may be attached to the front fender 3 as long as a structure for appropriately holding the reinforcing member 56 can be provided to the front fender 3.

The operation and effect according to the present embodiment will be described below.

(1) The speaker system 1 has a directional horn 33, and the directional horn 33 attaches a first directional angle θ a in a first direction D1 to sound emitted from the middle tweeter 32 and attaches a second directional angle θ B narrower than the first directional angle θ a in a second direction D2 orthogonal to the first direction D1. In addition, the speaker system 1 includes: a front baffle 3 mounted with a directional horn 33; a perforated net 4 formed integrally with the front fender 3 or attached to the front fender 3 separately from the front fender 3. The speaker system 1 further includes a reinforcing member 56 disposed so as to contact the rear surface 57 of the perforated mesh 4 and extend along the first direction D1, and the surface 57 is a surface on the side facing the directional horn 33.

In order to satisfy the desired pilling prevention performance only by the strength of the perforated web 4, the thickness of the perforated web 4 in the depth direction needs to be made thick. However, since the depth of the holes 26 in the perforated web 4 is also increased, the directivity characteristic of the directional horn 33 is corrected by the perforated web 4, and there is a possibility that the target directivity characteristic cannot be achieved.

In addition, when the reinforcing rib is provided on the back surface 57 of the perforated screen 4 to reinforce the perforated screen 4, the directivity characteristic of the directional horn 33 may be corrected by the rib depending on the arrangement direction of the rib, and the target directivity characteristic may not be achieved.

Therefore, in the present embodiment, as shown in fig. 7 and 8, the reinforcing member 56 is disposed in a direction in which the directivity characteristics of the directional horn 33 are hardly affected. Specifically, the reinforcing member 56 is disposed so as to extend along the first direction D1.

As shown in fig. 10, in a state where the reinforcing member 56 is disposed, the reinforcing member 56 is sandwiched between the perforated web 4 and the directional horn 33 so that the reinforcing member 56 is in contact with the back surface 57 of the perforated web 4. Thus, when the ball 60 hits the portion of the perforated web 4 covering the second opening portion 17, the reinforcing member 56 and the directional horn 33 as a rigid body can receive the flexural deformation of the perforated web 4.

According to the present embodiment, it is possible to provide the speaker system 1 in which the mesh 4 can exhibit a desired anti-roll performance without affecting the directivity characteristics of the directional horn 33.

Further, by forming the perforated mesh 4 integrally with the front baffle 3, the number of parts of the speaker system 1 can be reduced, and the number of manufacturing steps and manufacturing cost of the speaker system 1 can be reduced.

(2) The reinforcing member 56 is attached to the directional horn 33 or the front baffle 3, and is in contact with a back surface 57 of the perforated web 4, the back surface 57 being a surface on the side opposite to the directional horn 33.

Thus, when the ball 60 hits the portion of the perforated web 4 covering the second opening portion 17, the reinforcing member 56 and the directional horn 33 as a rigid body can receive the flexural deformation of the perforated web 4.

(3) At least one of the directional horn 33 and the front baffle 3 is formed with receiving

grooves

61, 62 for receiving and holding the reinforcing member 56, and the reinforcing member 56 is fixed to the receiving

grooves

61, 62 in a state of being received in the receiving

grooves

61, 62.

By forming the receiving

grooves

61, 62 that receive and hold the reinforcing member 56 on at least one of the directional horn 33 and the front baffle 3, the reinforcing member 56 can be stably held.

Further, by fixing the reinforcing member 56 to the

housing grooves

61 and 62 in the state of housing the reinforcing member in the

housing grooves

61 and 62, it is possible to suppress the reinforcing member 56 from vibrating with respect to the directional horn 33 and the front baffle 3 to generate so-called chatter sound.

(4) The perforated web 4 is made of resin, and the reinforcing member 56 is made of metal.

By making the reinforcing member 56 of metal, the depth can be reduced with the same strength as compared with the case where the reinforcing member 56 is made of resin, and the influence on the directivity characteristics of the directional horn 33 can be suppressed to be smaller.

(5) The distance Pc between the upper frame 52 of the inner frame portion 51 and the upper reinforcement member 56, the interval Pa between the pair of upper and lower reinforcement members 56, and the distance Pd between the lower frame 53 of the inner frame portion 51 and the lower reinforcement member 56 in the directional horn 33 are substantially equal to each other.

By making these distances Pc, Pa, and Pd uniform and substantially equal, even if the ball 60 hits the part of the perforated net 4 covering the second opening portion 17, the reinforcing member 56 can receive a force uniformly.

However, the speaker system of the present invention has been described by taking the above embodiment as an example, and is not limited to this embodiment, and various other embodiments can be adopted within a scope not departing from the gist of the present invention.

For example, the reinforcing member may be formed in a cross shape according to the pointing angle of the directional horn.

Description of the symbols

1 speaker system

3 front baffle

4 perforated web

32 middle high-sound loudspeaker (loudspeaker)

33 directional horn

56 reinforcing element

61 accommodating groove

62 accommodating groove

Claims

1. A speaker system comprising:

a speaker;

a directional horn that attaches a first directional angle to a sound emitted from the speaker in a first direction and attaches a second directional angle narrower than the first directional angle in a second direction orthogonal to the first direction;

the front baffle is provided with the directional loudspeaker;

a perforated net formed integrally with the front barrier or mounted to the front barrier separately from the front barrier; and

a reinforcing member disposed in contact with a surface of the perforated web on a side opposite to the directional horn and extending in the first direction.

2. The speaker system of claim 1,

the reinforcing member is mounted on the directional horn or the front baffle.

3. The speaker system of claim 1,

a receiving groove that receives and holds the reinforcing member is formed on at least one of the directional horn and the front baffle,

the reinforcing member is fixed to the housing groove in a state of being housed in the housing groove.

4. The speaker system of any of claims 1-3,

the perforated web is made of a resin,

the reinforcing member is made of metal.