JP5309713B2 - Speaker - Google Patents

Abstract

In a speaker set having an enclosure containing a drive unit, a flying bridge is arranged to interconnect inner walls of the enclosure. The flying bridge is formed with a recess at location excluding a portion abutting the inner walls, and a damping material is fitted in the recess for absorbing vibration of the enclosure. Typically, the flying bridge interconnects opposite ones of the inner walls of the enclosure. The flying bridge is composed of a plurality of wedge-shaped parts contacting each other at planes oblique to the inner walls interconnected by the flying bridge, and the wedge-shaped parts are arranged such that a front end of one wedge-shaped part is directed opposite to a front end of another wedge-shaped part which is adjacent to the one wedge-shaped part.

Description

  The present invention relates to a speaker having a structure for suppressing vibration of an enclosure caused by vibration of a speaker unit.

  In the conventional speaker, since the speaker unit vibrates when sound is emitted, vibration is transmitted from the speaker unit to the enclosure. For this reason, the enclosure vibrates and a box sound is generated, which causes a problem that noise is generated and sound quality is deteriorated. Therefore, conventionally, a speaker for reducing vibration of the enclosure has been proposed (for example, see Patent Document 1).

For example, Patent Document 1 discloses an invention of a speaker box using MDF (composite material) in which a damping sheet is sandwiched between wall surfaces of an enclosure.
JP 2000-125380 A

  However, in the invention of Patent Document 1, although the vibration of the speaker box body is reduced, there is a problem that the vibration cannot be completely suppressed. Moreover, the composite material used for each wall surface had the problem that it was expensive. Furthermore, in order to obtain the effect, it is necessary to select the material of the composite material by trial and error, and there is a problem that it takes time and effort.

  Therefore, a speaker that can effectively suppress vibration of the enclosure using an inexpensive material is provided.

  In the speaker of the present invention, the inner walls of the enclosure are connected to each other by a crosspiece. In addition, the crosspiece is formed with a notch at a portion other than a portion in contact with the inner wall of the enclosure. Furthermore, a vibration damping material is inserted into the notch. Thereby, the crosspiece in which the notch is formed operates as an elastic body while connecting the inner walls of the enclosure, and the damping material fitted in the notch absorbs vibration transmitted to the crosspiece. For this reason, even if the vibration of the speaker unit is transmitted to the enclosure, the vibration of the enclosure absorbs the vibration of the enclosure, so that the vibration of the enclosure can be suppressed. As a result, noise generated by the vibration of the enclosure can be suppressed. In addition, since the crosspiece has a structure in which a vibration-damping material is fitted by providing a notch, it can be easily produced at low cost.

  Moreover, the speaker of this invention is good also as a structure which connects the inner wall which faces each other among the inner walls of an enclosure with a crosspiece. As a result, the inner walls facing each other can be prevented from vibrating.

  Furthermore, the speaker according to the present invention may be configured such that the position where the amplitude is maximum among the inner walls of the enclosure, for example, the approximate centers of the two inner walls having the largest area among the inner walls of the enclosure are connected. In this way, since the crosspiece is connected to the position where the amplitude is maximized, the vibration of the enclosure can be suppressed most effectively.

  In addition, the speaker of the present invention comprises a plurality of wedge-shaped parts, and each part is brought into contact with a plane that is not parallel to the inner wall surface of the enclosure, and the wedge-shaped tip part is opposite to the adjacent part. It is good also as a structure arrange | positioned so that it may face. For example, when the crosspiece is composed of two wedge-shaped parts A and B, each part is arranged and attached to the inner wall of the enclosure as follows. First, the front end portion of the part A is directed to the front side, and one surface is fixed to the central portion of the inner wall of the left side surface of the enclosure. Subsequently, with the front end of part B facing the rear side, one surface is in contact with the center of the inner wall on the right side of the enclosure so that the planes that are not parallel to the inner wall of the enclosure of parts A and B are in contact with each other. To place. Then, each part is slid until each part connects the inner walls of the enclosure. As a result, each part of the crosspiece can be attached to the distance between the inner walls facing each other without adjusting the crosspiece size (width), and it is necessary to create the crosspiece size precisely for each enclosure. And can easily create a crosspiece.

  Moreover, the speaker of this invention is good also as a structure which connects adjacent inner walls among the inner walls of an enclosure by a crosspiece. With this configuration, for example, even when a speaker unit or the like becomes an obstacle and the inner walls facing each other cannot be connected, the enclosure can be prevented from vibrating by connecting the adjacent inner walls with a crosspiece. .

  Furthermore, the speaker of this invention is good also as a structure which inserts a damping material in a notch in the contracted state. Thereby, since the damping material is always sandwiched by the notch, the damping material can be held by the notch without bonding.

  According to the present invention, since the speaker can reliably suppress the vibration of the enclosure, the sound quality is not deteriorated by noise generated by the vibration of the enclosure, and the sound quality can be improved. In addition, noise generated by vibration of the enclosure can be suppressed at low cost and easily.

“First Embodiment”
The speaker according to the first embodiment will be described with reference to FIGS. FIG. 1 is an explanatory view showing a crosspiece according to the first embodiment. FIG. 1 (A) is a front view showing a timber as a material of the crosspiece, and FIG. 1 (B) is a front view showing an overview of the crosspiece. FIG. 2 is an explanatory view showing a procedure for attaching the crosspiece. 2A is a top perspective view showing the inside of the enclosure before the mounting of the crosspiece, and FIG. 2B is a top perspective view showing the inside of the enclosure after the mounting of the crosspiece. FIG. 3 is a conceptual diagram for explaining the vibration generated in the speaker enclosure. FIG. 4 is an oblique perspective view for explaining the enclosure in which the attachment of the crosspiece is completed. FIG. 4A shows an example of one set of bars, and FIG. 4B shows an example of three sets of bars.

  First, the shape of the crosspiece 3 to be installed in the enclosure 2 (see FIG. 2) of the speaker 1a and an example of the creation method will be described. As shown in FIG. 1A, the crosspiece 3 is created using a rectangular parallelepiped wood 5 having a predetermined thickness. The wood 5 can be an inexpensive material such as MDF (Medium Density Fiber). The crosspiece 3 is composed of a set of parts 3a and 3b cut along a straight line L that passes through a substantially center O of the rectangular parallelepiped wood 5. At this time, the straight line L is not parallel to each side of the wood 5. Each of the parts 3a and 3b of the crosspiece 3 has a right trapezoidal shape with a cut surface being a hypotenuse, but is not limited thereto, and may be a wedge shape. For example, a triangle may be used. However, when the parts 3a and 3b are formed in a triangular shape, the strength of the acute angle portion is weakened, so it is necessary to pay attention to this point when mounting.

  As shown in FIG. 1 (B), the parts 3a and 3b have two surfaces adjacent to the cut surface 31, from the approximate center of the long surface 33 to the approximate center of the short surface 34. A notch is made and a notch 30 is created. The width of the notch 30 is preferably constant. In the notch 30, the damping material 4 is fitted on the surface 33 side. As the damping material 4, a material having a width larger than the width of the notch 30 and a length that is substantially half of the length of the notch 30 is used. The damping material 4 is preferably made of a material with little change with time and little compression strain. Specifically, the damping material 4 is preferably a high density urethane foam or the like.

  As described above, the crosspiece 3 can be easily and inexpensively produced because it cuts the inexpensive wood 5 and only provides the notch 30 with the damping material 4 interposed therebetween. Further, since the damping material 4 having a thickness larger than the width of the notch 30 is sandwiched, the damping material 4 is pressed against and easily fixed by the notch 30.

  Next, a procedure for attaching the crosspiece 3 to the enclosure 2 of the speaker 1a will be described. First, as shown in FIG. 2A, the part 3 a is arranged so that the surface 32 of the part 3 a contacts the inner wall of the left side surface 23 of the enclosure 2. Subsequently, the surface 32 of the part 3b and the inner wall of the right side surface 22 of the enclosure 2 are made parallel, and the surface 31 of the part 3b is brought into contact with the surface 31 of the part 3a. Then, the part 3b is moved in the direction of the arrow 7 along the cut surface 31 of the part 3a. As shown in FIG. 2B, when the surface 32 of the part 3b comes into contact with the inner wall of the enclosure 2 and the parts 3a and 3b push the side surfaces 22 and 23 to a certain extent and are stretched, the part 3b moves. Stop. Thus, the mounting of the crosspiece 3 is completed, and the inner walls facing each other of the enclosure 2 can be firmly connected by the crosspiece 3.

  In this way, by providing the crosspiece 3, the vibrations of the side surfaces 22 and 23 of the enclosure are transmitted to the crosspiece 3 (parts 3a and 3b), and the notch 30 provided in parallel with the surface 32 expands and contracts according to this vibration. It operates as an elastic body. And the damping material 4 inserted in the notch 30 absorbs the energy of this expansion-contraction movement (vibration), converts it into thermal energy, and dissipates heat.

  Thereby, the crosspiece 3 can absorb the vibration which arises in the inner wall which the enclosure 2 faces. Further, since the crosspiece 3 is composed of a plurality of wedge-shaped parts, the crosspiece 3 can be easily attached to the inner wall of the enclosure 2.

  Further, as described above, the size of the crosspiece 3 (the distance between the surface 32 of the part 3a and the surface 32 of the part 3b) can be adjusted only by moving the part 3b along the cut surface 31 of the part 3a. it can. Thereby, even if the distance between the inner walls facing each other of the enclosure 2 is slightly different due to an error in manufacturing or the like, the crosspiece 3 can reliably connect the inner walls facing each other of the enclosure 2. For this reason, when creating the crosspiece 3, it is not necessary to strictly measure the distance between the inner walls of the speaker 1a. Therefore, the crosspiece 3 can be easily produced.

  Here, the vibration which arises in the enclosure 2 of the speaker 1a is demonstrated. In the vertically long speaker 1a shown in FIG. 3, when the attachment surface 21 to which the speaker unit 20 is attached is a front surface, the areas of the side surfaces 22 and 23 are the largest among the wall surfaces of the speaker 1a. For this reason, of the wall surface of the speaker 1a, the central portions of the side surfaces 22 and 23 vibrate most, and the amplitude of these portions becomes maximum.

  Therefore, as shown in FIG. 4 (A), the rails are connected so as to connect the portions that are approximately the center (the portion where the amplitude is maximum) of the inner surfaces of the side surfaces 22 and 23 (the wall surface having the largest area) of the speaker 1a. 3 is attached. Thereby, the crosspiece 3 can absorb the vibration of the enclosure 2 more effectively. It should be noted that the number of the crosspieces 3 may be one or more, and as shown in FIG. 4B, a plurality of sets are more preferable than one set because vibration of the enclosure 2 can be absorbed.

  The crosspiece 3 according to the first embodiment was created such that the sides facing each other (the surface 32 of the part 3a and the surface 32 of the part 3b, the surface 33 and the surface 34 of the parts 3a and 3b) were parallel to each other. However, the surfaces 33 and 34 of the parts 3a and 3b that do not come into contact with the enclosure 2 need not be formed so as to be parallel.

  Further, an example has been described in which the parts 3a and 3b of the crosspiece 3 according to the first embodiment are attached so as to stretch the both side surfaces 22 and 23 of the enclosure 2 so as to stretch. However, the present invention is not limited to this, and each part of the crosspiece 3 may be attached so as to connect between both side surfaces of the enclosure 2 using an adhesive or a screw. When using screws, the crosspieces 3 may be attached so as to push and narrow the side surfaces 22 and 23 of the enclosure 2.

  FIG. 5 is a front view showing another crosspiece of the first embodiment. Although 1st Embodiment demonstrated the case where the crosspiece 3 was comprised from two parts, this invention is not restricted to this, Furthermore, you may comprise from several wedge-shaped parts. For example, the crosspiece 3 ′ shown in FIG. 5A is composed of a plurality of parts 3 a ′ to 3 c ′ cut in a straight line so as not to be parallel to each side constituting the outer periphery of the wood 5. And in each part, the notch 30 'is formed and the damping material 4 is inserted. When configured in this way, each part may be placed in contact with a plane that is not parallel to the inner wall surface of the enclosure, so that the wedge-shaped tip is directed in the opposite direction to the adjacent part. Thereby, it can connect reliably to the inner wall which the enclosure 2 faces, and the vibration of the enclosure 2 can be suppressed. Further, as shown in FIG. 5B, the crosspiece 3 '' may be composed of one part. In this case, the crosspiece 3 is attached so as to connect between both side surfaces of the enclosure 2 using screws.

  FIG. 6 is a front view showing another crosspiece of the first embodiment. In the first embodiment, the description has been given of the case where the notch 30 is provided for each crosspiece. However, the present invention is not limited to this, and the cutout 30 '' 'may be provided only for a part of the crosspieces. For example, the crosspiece 3 ′ ″ shown in FIG. 6 is composed of a plurality of parts 3a ′ ″ and 3b ′ ″ cut in a straight line so as not to be parallel to the sides constituting the outer periphery of the wood 5. . Then, a notch 30 ″ ″ is formed in the crosspiece 3 b ″ ″ and the damping material 4 is fitted therein.

  As described above, the crosspiece 3 can be easily produced at low cost and absorbs the vibration of the enclosure 2, so that the vibration of the enclosure 2 can be suppressed. Therefore, it is possible to suppress noise caused by vibration of the enclosure 2 easily and inexpensively.

“Second Embodiment”
A speaker according to the second embodiment will be described with reference to FIGS. FIG. 7 is a general view for explaining the crosspiece of the second embodiment. FIG. 7A is a front view showing a timber as a material of the crosspiece, and FIG. 7B is a front view showing an overview of the crosspiece. FIG. 8 is an oblique perspective view for explaining the enclosure in which the attachment of the crosspiece is completed. In the second embodiment, the shape of the crosspiece 6 and connecting the adjacent inner walls of the enclosure 2 using the crosspiece 6 are different from the first embodiment. Therefore, only differences from the first embodiment will be described below.

  First, the shape of the crosspiece 6 to be installed in the enclosure 2 of the speaker 1b and the production method will be described. As shown in FIG. 7A, the crosspiece 6 is created by cutting along a straight line L that passes through the approximate center O of the rectangular parallelepiped wood 5. For this reason, although the crosspiece 6 becomes a right trapezoid shape, it is not restricted to this.

  As shown in FIG. 7B, a notch 60 is formed in the crosspiece 6 from the approximate center of the cut surface 61 of the wood 5 toward the corner A (the angle formed by the surface 62 and the surface 63). In the notch 60, the damping material 4 is fitted on the cut surface 61 side, like the parts 3a and 3b of the crosspiece 3 shown in FIG. At this time, the damping material 4 is sandwiched between the notches 60 and contracts by using a material that is thicker than the width of the notches 60. As described above, since the inexpensive wood 5 is cut and the notch 60 sandwiching the damping material 4 is provided, the crosspiece 6 can be easily and inexpensively made.

  Next, a procedure for attaching the crosspiece 6 to the enclosure 2 of the speaker 1b will be described. First, as shown in FIG. 8A, the crosspiece 6 is attached so as to connect adjacent inner walls of the enclosure 2. At this time, the crosspiece 6 is attached by bonding with an adhesive so that the surfaces 62 and 63 of the crosspiece 6 are in contact with the adjacent inner wall of the enclosure 2.

  In this way, by providing the crosspieces 6, vibrations of the adjacent inner walls of the enclosure 2 are transmitted to the crosspieces 6, and the notch 60 operates as an elastic body that expands and contracts in response to the vibrations. And the damping material 4 inserted by the notch 60 absorbs the energy of this expansion-contraction movement (vibration), converts it into thermal energy, and dissipates it.

  In particular, a location that is substantially the center of the inner wall of the right side surface 22 (the wall surface having the largest area) of the enclosure 2 (a location that maximizes the amplitude) and a surface adjacent to the right side surface 22 (the mounting surface 21, the bottom surface 24, and the top surface 25). Or the inner wall of the back surface 26). Similarly, a location (location where the amplitude is maximum) of the inner wall of the left side surface 23 (wall surface having the largest area) of the enclosure 2 and a surface (mounting surface 21, bottom surface 24, top surface) adjacent to the left side surface 23. 25, or the inner wall of the back surface 26). Thereby, the crosspiece 6 can absorb the vibration of the place where the amplitude becomes the maximum, so that the vibration of the enclosure 2 can be effectively absorbed.

  Further, in the sides 221 to 224 forming the right side surface 22 of the enclosure 2, the amplitude increases as the distance between the facing sides (the distance between the long side 221 and the long side 223, the distance between the short side 222 and the short side 224) increases. . For this reason, it is preferable to attach the crosspiece 6 so that the corner A of the crosspiece 6 contacts the center of the short side 222 (or the short side 224) of the right side 22 rather than the long sides 221 and 223 of the right side 22. That is, it is better to connect the right side surface 22 and the bottom surface 24 (or the top surface 25) than to connect the right side surface 22 and the back surface 25 (or the attachment surface 21). Similarly, in the sides 231 to 234 forming the left side surface 23 of the enclosure 2, the corners of the crosspiece 6 are more centered on the short side 232 (or the short side 234) of the left side surface 23 than the long sides 231 and 233 of the left side surface 23. It is good to attach the crosspiece 6 so that A may contact. As a result, the crosspiece 6 can effectively absorb the vibration of the place where the amplitude becomes maximum, and thus can absorb the vibration of the enclosure 2 more effectively.

  Thereby, the crosspiece 6 can absorb the vibration which arises in the adjacent inner wall (inner wall of the side surface 22 and the bottom face 24) of the enclosure 2. FIG. Further, the crosspiece 6 can be easily attached to the inner wall of the enclosure 2.

  In addition, the crosspiece 6 is connected by bringing the surface 62 having an obtuse tip into contact with a portion where the amplitude is maximum and bringing the surface 63 having an acute angle into contact with an adjacent inner wall. That is, by providing the strong side of the crosspiece 6 on the high amplitude side, the adjacent inner walls can be more firmly connected. The number of bars 6 may be any number, and as shown in FIG. 8B, a plurality of bars 6 are more preferable than one because they can absorb vibration of the enclosure 2. In particular, the mounting surface 21 is made stronger than other wall surfaces for mounting the speaker unit 20 and is resistant to vibration. For this reason, if the surface (the bottom surface 24, the upper surface 25, or the back surface 26) excluding the attachment surface 21 and the side surface 22 or the side surface 23 are attached by the crosspiece 6, the vibration of the enclosure 2 can be more effectively suppressed. .

  In the second embodiment, the angle A is formed at a right angle. However, the corner A does not have to be formed at a right angle because it only needs to contact the inner wall of the enclosure 2 when installed in the enclosure 2.

  As described above, the crosspiece 6 can be easily and inexpensively produced and absorbs the vibration of the enclosure 2, so that the vibration of the enclosure 2 can be suppressed. Therefore, it is possible to suppress noise caused by vibration of the enclosure 2 easily and inexpensively.

  In addition, the shape of the crosspiece is not limited to the above-described embodiment, and it is only necessary to provide a notch into which the damping material 4 is fitted, and the inner walls of the enclosure 2 may be connected by the crosspiece. Further, the number of notches provided in the crosspiece is not limited to one as in the above-described embodiment, and may be a plurality of places.

It is explanatory drawing which shows the crosspiece of 1st Embodiment. It is explanatory drawing which shows the attachment procedure of a crosspiece. It is a conceptual diagram for demonstrating the vibration which arises in the enclosure of a speaker. It is an oblique perspective view for demonstrating the enclosure which the attachment of the crosspiece was completed. It is a front view which shows the other crosspiece of 1st Embodiment. It is a front view which shows the other crosspiece of 1st Embodiment. It is a general-view figure for demonstrating the crosspiece of 2nd Embodiment. It is an oblique perspective view for demonstrating the enclosure which the attachment of the crosspiece was completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Speaker, 2 ... Enclosure, 3a, 3b ... Parts, 3, 6 ... Crosspiece, 4 ... Damping material, 5 ... Wood, 7 ... Arrow, 20 ... Speaker unit, 30, 60 ... Notch, 31, 61 ... Cut surface, A ... corner, L ... straight line, O ... approximately center

Claims (6)

It has a crosspiece that connects the inner walls of the enclosure,
The crosspiece is formed with a notch at a portion other than a portion in contact with the inner wall, and a damping material is fitted into the notch,
Speaker the damping material is fitted into the part of the notch.   The speaker according to claim 1, wherein the crosspiece connects the inner walls facing each other among the inner walls of the enclosure.   The speaker according to claim 2, wherein the crosspieces connect positions where the amplitude of the inner wall of the enclosure becomes maximum.   The crosspiece is composed of a plurality of wedge-shaped parts that are in contact with each other in a plane that is not parallel to the inner wall surface of the enclosure to be connected, and each part is arranged so that the wedge-shaped tip end faces in the opposite direction to the adjacent part. The speaker according to claim 2 or claim 3 to be performed.   The speaker according to claim 1, wherein the crosspiece connects adjacent inner walls among the inner walls of the enclosure.   The speaker according to claim 1, wherein the damping material is fitted into the notch in a contracted state.

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