JP5145310B2 - Insulator - Google Patents

Description

  The present invention relates to an insulator that is inserted between, for example, a speaker, an LP player, a CD player, etc., and a floor or a rack, and suppresses vibration from either one from being transmitted to the other.

This type of insulator has been commercially available at so-called audio shops, and is favored by users who are interested in reproduced sound, such as so-called audio enthusiasts.
In addition, attempts have been made to improve sound quality by preventing the vibration of the speaker from being transmitted to the outside by suspending the speaker with a wire. For example, in order to accurately grasp the acoustic characteristics of a speaker housed in a box, a certain speaker manufacturer hangs the speaker from the ceiling in an anechoic chamber with a sound-absorbing material attached to the inner surface, and performs measurement with a microphone. Has been made.
Although not currently available in the catalog on the market, a vibration absorbing device has been introduced that can absorb vibration components in the vertical and horizontal directions by a suspension structure using wires and leaf springs (see, for example, Patent Document 1).

  Further, although not particularly in the audio field, a vibration isolator used at the time of installation and transportation of precision equipment has been introduced that uses a suspension member (wire) and a spring (see, for example, Patent Document 2).

JP 59-19739 (FIGS. 1 and 2) JP-A-63-195445 (FIG. 5 etc.)

  Insulators that have been widely marketed in the past can be simply inserted between speakers and various players in use and the floor or rack in terms of being a single form of article, and its application is extremely simple. On the other hand, there are the following problems.

That is, most of these insulators are of a type that absorbs vibration using an elastic material such as synthetic rubber. In the case of an insulator using this elastic material, this elastic material has a three-dimensional volume, and is deformed three-dimensionally when vibration pressure is applied. Therefore, not only the original vibration component is absorbed, but also a vibration component that does not exist originally may be generated due to this three-dimensional deformation. As a result, the playback sound obtained by using this type of insulator for speakers and various players includes distortions, timbres that did not exist in the original sound source, and “sound traps” specific to individual insulators. There is a problem that is added.
Of course, some audiophiles may prefer this “sound of sound”, but it is not preferable from the viewpoint of faithfully reproducing the sound source.

  On the other hand, the vibration absorbing device described in Patent Document 1 is a substantially downsized structure for hanging a speaker, which has been practiced by some speaker manufacturers, etc. There is an advantage that it is easy to apply. However, in order to achieve miniaturization, very short wires are used, and in order to fully demonstrate the simple features of the wire suspension structure that vibrates simply and freely, objects such as speakers It is necessary to satisfy the conditions considering the characteristics of the vibration pattern and the support structure by the insulator, etc., but as will be described in detail in the embodiment of the present invention in the later stage, these conditions are not satisfied. As a result, it must be said that the characteristics as an insulator also have a certain limit.

  In addition, the vibration isolator described in Patent Document 2 is used for installation of precision equipment and vibration suppression during transportation, and cannot be diverted to a field where delicate operating characteristics for audio applications such as the present application are a subject. Absent. Even if the suspension structure is applied to an insulator for audio applications, as described in the case of the above-mentioned Patent Document 1, it does not satisfy the conditions for exhibiting the maximum advantage of the wire suspension structure. The characteristics as an insulator cannot be sufficient.

  The present invention has been made in order to solve the above-described problems of the conventional ones, and employs a structure suspended by a wire, and at the same time, maximizes the simple features of the suspension structure that it vibrates simply and freely. An object of the present invention is to obtain an insulator having an excellent vibration transmission cutoff characteristic to which an unnecessary vibration component is not added by satisfying the configuration that can be exhibited in half.

The insulator according to the present invention includes a first horizontal plane at the upper end of the first object and a second horizontal plane positioned above the first horizontal plane at the lower end of the second object positioned above the first object. In the insulator that suppresses the vibration from one of the two objects from being transmitted to the other of the two objects, the vibration direction of the second object is substantially horizontal. The speaker is provided with a vibration plate in a box in a posture, and a lower first support member whose bottom surface is in contact with the first horizontal plane is provided for each portion supporting the speaker, and an upper end of the speaker is provided with an elastic member. through and coupled to the first support member via the elastic member and the wire by being directly coupled single wire consisting of the line than twisting a plurality of thin lines, and the lower end of the wire The Rukoto comprising a large second support member of the first rigid suspended top from the support member in contact with the second horizontal surface, the second of the speaker placed on the upper surface of the support member In the horizontal direction, free vibration of single oscillation of pendulum motion is possible with the upper end of the wire as a fulcrum, and the equation (fh = √ (G / l) / (2 · π ) However, the length of the wire is set so that the natural vibration frequency determined by fh: natural vibration frequency, G: gravitational acceleration, l: wire length) is less than the lower limit of human audible frequency. is there.

Since the insulator according to the present invention is configured as described above, for example, in the case where the first object is a floor , the lower surface abuts on the floor surface as the first horizontal plane. If the first support member is placed on the second support member and the lower end of the speaker is placed on the upper surface of the second support member, the insulator can be installed, so that its application becomes extremely simple.
Then, a simple and free vibration structure is realized in which the speaker is suspended at the lower end of one wire at each location where the speaker is substantially supported via the second support member, and the lateral vibration of the speaker is reduced. A state of being separated and insulated from the floor is realized. Further, the vibration in the vertical direction of the speaker is absorbed by the elastic deformation of the elastic member provided at the upper end of the same single wire, and a state of being surely separated and insulated from the floor is realized. Therefore, the speaker is in a state of being lifted from the floor, and an excellent vibration transmission cutoff characteristic in which unnecessary vibration components are not added can be obtained.
Further, the wire has a sufficiently small bending rigidity by adopting a single twisted wire obtained by combining a plurality of fine wires, and the pendulum movement with the upper end of the wire as a fulcrum is made smoother. Since the natural frequency in the horizontal direction is set below the lower limit of the human audible frequency, no harmful resonance phenomenon occurs in the audible frequency region.

It is a figure which shows an example at the time of applying the insulator by this invention to a speaker. It is a figure which shows an example at the time of applying the insulator by this invention to LP player. It is a figure which shows the structure of the insulator in Embodiment 1 of this invention. It is a figure which shows the structure of the insulator in Embodiment 2 of this invention. It is a figure which shows the structure of the insulator in Embodiment 3 of this invention. It is a figure which shows an example at the time of applying the composite type insulator in Embodiment 6 of this invention to a speaker. It is a figure which shows the principal part of the composite type insulator in Embodiment 6 of this invention in a cross section. It is a composite type insulator in Embodiment 6 of this invention, and is a figure which shows the principal part of the further modification of FIG. 7 in a cross section.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an example in which an insulator according to the present invention is applied to a speaker. Here, an insulator 5 is inserted between the speaker 3 in which the speaker body 1 is housed in the box 2 and the floor 4 to prevent the vibration of the speaker 3 from being transmitted from the floor 4 to the outside. FIG. 1A is a view seen from the front of the speaker 3, and FIG. 1B is a plan view, and uses four insulators 5.
Of course, one speaker 3 may be supported by three insulators 5 as shown in FIG. In this case, the load on each insulator 5 is increased by that amount. However, the support structure is stabilized by the three-point support, and the number of insulators 5 can be reduced.
In this example, the speaker 3 and the floor 4 correspond to the second object and the first object, respectively, in the claims of the present application.

FIG. 2 is a front view (a) and a plan view (b) showing an example when the insulator according to the present invention is applied to an LP player. Here, three insulators 5 are inserted between the LP player 6 and a so-called rack 7 on which an audio product is placed, so that vibration from the rack 7 is prevented from being transmitted to the LP player 6.
In this example, the LP player 6 and the rack 7 correspond to the second object and the first object, respectively, in the claims of the present application.

  FIGS. 3A and 3B are diagrams showing the configuration of the insulator according to Embodiment 1 of the present invention. FIG. 3A is a plan view, and FIG. 3B is a view taken along line AA in FIG. It is sectional drawing. In the figure, the insulator 5 includes a first object 8 (the floor 4 in FIG. 1 corresponds to the rack 7 in FIG. 2) and a second object 9 (FIG. 1) located above the first object 8. In FIG. 2, the speaker 3 is interposed between the speaker 3 and the LP player 6 in FIG.

  The base 11 constituting the first support member 10 is placed such that the lower surface thereof is in contact with the first horizontal plane 8A at the upper end of the first object 8. Further, one end of the relay part 14 is connected to one end of the base part 11, and a support part 12 arranged in parallel to the base part 11 and connected to the upper end of the wire 13 is connected to the other end of the relay part 14. It is connected. And the relay part 14 and the support part 12 function as an elastic member, and absorb the vibration of the vertical direction which generate | occur | produces in the 2nd object 9. FIG.

  The second support member 15 has a shape in which a steel plate is molded into a square container and has a posture in which the bottom is up and the open part is down, and the upper surface is a second horizontal plane 9A of the second object 9. It is placed so that it touches. The second support member 15 is formed of a container-like main body portion 16 and a fixing portion 17 in which both ends of the main body portion 16 are coupled to the inner surface of the main body portion 16 and the lower end of the wire 13 is coupled. ing.

The wire 13 may be a single wire made of a metal material, but the one in which a plurality of fine wires are combined to form one strand is more reliably deformed in the radial direction at the end thereof, That is, it is considered desirable because the bending rigidity is reduced.
The thickness of the wire 13 needs to have a required mechanical strength in consideration of the mechanical characteristics of the material and the weight of the first object 9.
As will be described later, the length of the wire 13 is desirably set to a certain length or more from the relationship of the natural vibration frequency characteristics taking into account the lower limit of the human audible frequency.

As described above, the insulator according to the first embodiment of the present invention is an article in a single form, as is the case with an insulator using synthetic rubber and the like that have been widely marketed, as can be easily understood from FIG. Therefore, the user only has to insert the speaker or various players in use between the floor and the rack, and there is an advantage that the application is extremely simple.
Furthermore, a simple and free vibration structure is realized in which one portion of the second object 9 is suspended by the lower end of one wire 13 via the second support member 15, A state in which the lateral vibration of the object 9 is reliably separated and insulated from the first object 8 is realized. Further, the vibration in the vertical direction of the second object 9 is absorbed by the elastic deformation of the elastic members 12 and 14 connected to the upper end of the same single wire 13, thereby realizing a state of being surely separated and insulated from the first object 8. As a result, an excellent vibration transmission cutoff characteristic that does not add unnecessary vibration components can be obtained.

  In addition, when the insulator according to the present invention is applied, the second object, for example, the speaker, and the first object, for example, the floor, are acoustically (vibratively) insulated so that the speaker is lifted off the floor. Equivalent to state. Therefore, the box containing the speaker body can freely ring (vibrate) freely due to its inherent acoustic characteristics without being constrained from the outside (floor). When applied to high-quality speakers, which are so-called masterpieces, designed and manufactured to realize attractive and reproducible sound, the excellent sound quality is fully exhibited.

Embodiment 2. FIG.
4A and 4B are diagrams showing a configuration of an insulator according to Embodiment 2 of the present invention. FIG. 4A is a plan view, and FIG. 4B is a view taken along line BB in FIG. It is sectional drawing. Since the procedure for installing this insulator 5A is exactly the same as in the first embodiment, the description thereof is omitted.

The first support member 18 is formed by molding a steel plate, and the lower surface of the first support member 18 is placed in contact with the first horizontal plane 8A at the upper end of the first object 8. The first support member 18 includes a substrate portion 19 that is in contact with the first horizontal plane 8A, and a cylindrical side plate whose lower end in the axial direction (vertical direction in FIG. 4B) is coupled to the substrate portion 19. Part 20. The disc portion 21 is disc-shaped and its peripheral edge is detachably coupled to the side plate portion 20 so that the radial center of the disc portion 21 coincides with the radial center of the side plate portion 20, and the upper end of the wire 13 is at the radial center. They are combined to form an elastic member.
In addition, at four places in the circumferential direction of the side plate portion 20, openings for inserting a fixing portion 24 described later are formed in a range from the vicinity of the lower end to the upper end.

  The second support member 22 has a shape in which a steel plate is molded into a cylindrical container and has a posture in which the bottom is up and the open part is down, and the upper surface is a second horizontal surface of the second object 9. It is placed in contact with 9A. The second support member 22 includes a container-like main body portion 23 and a cross-shaped fixing portion in which the four end portions are coupled to the inner surface of the main body portion 23 and the lower end of the wire 13 is coupled to the center portion thereof. 24.

  As shown in the drawing, the side plate portion 20 of the first support member 18 and the disc portion 21 that is an elastic member adopt a structure that is detachably coupled by a fitting method. This is in consideration of the ease of assembling the insulator 5A. That is, here, first, the fixing portion 24 and the disc portion 21 are coupled to both ends of the wire 13, and then the fixing portion 24 is inserted through the opening formed around the side plate portion 20. The second support member 22 is lowered from above so as to cover the first support member 18, and finally the outer periphery of the disc portion 21 is fitted to the upper end of the side plate portion 29 to finish.

  However, the method of coupling the members constituting each of the first support member, the elastic member, and the second support member to each other is not limited to the method described above, depending on the material used, processing means, and the like. For example, it is natural that various methods such as welding and screwing may be adopted as an integrated structure by press working or the like.

  As described above, the insulator according to the second embodiment of the present invention is very simple to apply and has unnecessary vibration components as can be easily understood from FIG. 4 as in the first embodiment. Excellent vibration transmission cutoff characteristics that are not added can be obtained.

Embodiment 3 FIG.
5A and 5B are diagrams showing the configuration of an insulator according to Embodiment 3 of the present invention. FIG. 5A is a plan view, and FIG. 5B is a view taken along line CC in FIG. 5A. It is sectional drawing. This insulator 5B is basically the same as the insulator 5 in FIG. 3 described in the first embodiment, but considering the mass production, production efficiency, parts sharing, and homogenization of the finished quality are achieved. It was created in consideration of convenience during use, and also aesthetics.

The first support member 25 has a bottom surface 26 through a disc-shaped bottom plate portion 26 whose lower surface is in contact with the first horizontal surface 8A at the upper end of the first object 8, and three support columns A27 having a predetermined length. Are formed of a material having sufficient rigidity.
The spring 29, which is an elastic member, is an elastic metal plate having a predetermined thickness and width formed in a substantially U shape, and one of its long sides (the lower side in FIG. 5B) is coupled to the spring base 28. The upper end of the wire 13 is coupled to the other long side (the upper side in FIG. 5B).
The lower end of the wire 13 passes through a hole 29a provided in a part of the spring 29 and a hole 28a provided in a part of the spring base 28, and a lower cover part 33 of a second support member 30 described later. Is bound to.

The second support member 30 has a disk-shaped upper lid portion 31 whose upper surface is in contact with the second horizontal surface 9A of the second object 9, and a vertical direction between the spring base portion 28 and the bottom plate portion 26. A disc-shaped lower lid portion 33 provided with holes 33a through which the support columns A27 are inserted, and a cylindrical shape fitted to the peripheral edges of the upper lid portion 31 and the lower lid portion 33. The side part 32 and the lower end part of the support part B34 are coupled to the lower cover part 33 and the upper end part thereof is detachably coupled to the upper cover part 31 with a screw structure not shown. It is made of a material with sufficient rigidity.
As described above, the lower end of the wire 13 is coupled to the center of the lower lid portion 33.

  In FIG. 5, the upper lid portion 31 and the lower lid portion 33 are coupled via the support column B34. This is because the upper lid portion 31 is attached at the final stage of the assembly of the insulator 5B. It is intended to make work easier. Therefore, the column part B34 can be omitted by adopting a structure in which the upper lid part 31 and the lower lid part 33 are joined only by the side part 32.

  In the insulator 5B of FIG. 5, since the spring 29 is comprised with the independent component, there exists an advantage shown below. That is, as described above, the spring 29 is for absorbing the vibration in the vertical direction generated by the second object 9, for example, the speaker 3. It is desirable to set the spring strength according to the weight of the speaker 3 to be used so that the spring 29 exhibits a substantially constant deformation amount within the proportional elastic limit. In this case, by using the spring 29 as an independent part, other parts are common, and only a part of the spring 29 corresponding to the weight of the speaker 3 is prepared. Can be reduced.

  As described above, when the spring 29 is loaded and deformed within the proportional elastic limit, for example, when both the long sides are substantially parallel, the spring 29 is not used as an insulator that is not loaded. For example, as shown in FIG. 5B, both long sides are slightly expanded from parallel, and the second support member 30 is moved upward via the wire 13 by the elastic force of the spring 29 than when a load is applied. And the upper surface of the lower lid portion 33 of the second support member 30 is pressed against the lower surface of the spring base portion 28 of the first support member 25 (however, in FIG. 5B, the structure of each portion is understood) For ease of illustration, both sides are shown apart). In this case, the concentricity of both members 25 and 30 at the time of contact can be made more reliable by forming part of the uneven surface with the peripheral edge processed into a taper shape for positioning on both surfaces to be contacted.

  As a result, since the first support member 25 and the second support member 30 have the same center and are held together, handling in the distribution process of the insulator as a product becomes simple, Even when the user is inserted under a speaker or the like, it is possible to guarantee the use in a proper manner in a simple manner.

  As described above, the insulator according to the third embodiment of the present invention is very simple to apply and has unnecessary vibration components as can be easily understood from FIG. 5 as in the previous embodiment. Excellent vibration transmission cutoff characteristics that are not added can be obtained.

Embodiment 4 FIG.
Here, the contents to be further considered are exemplified by the case where the insulator described in each of the above embodiments is inserted and used between the speaker and the floor, which is most frequently used in the audio field, particularly in that field. Will be described.
Hereinafter, the structure of the insulator according to the present invention shown in FIG. 5 will be described with reference to FIG. Assuming that the first support member 25 and the second support member 30 are rigid bodies, when the speaker as the second object 9 generates vibration, the second support member to which the lower end of the wire 13 is coupled is shown. The speaker integrated with 30 performs a pendulum motion with the upper end of the wire 13 coupled to the first support member 25 via the spring 29 as a fulcrum.

  Since this pendulum motion has a very small amplitude at the level of the target vibration here, it may be regarded as a horizontal motion, and a free vibration system of simple vibration is established in mechanical engineering. And the natural vibration frequency fh in this free vibration is expressed by the following equation by the gravitational acceleration G and the length l of the wire.

  fh = √ (G / l) / (2 × π) (1)

When the length of the wire is 10 mm, the natural vibration frequency fh1 is obtained by substituting this into the equation (1), and is about 5 Hz.
Therefore, if the speaker vibrates at a frequency lower than the natural vibration frequency, the upper end of the wire accordingly follows the lower end of the wire connected to the speaker, and as a result, the vibration of the speaker is transmitted to the floor. become. On the contrary, in a range higher than the natural vibration frequency, the upper end of the wire does not follow the vibration of the lower end, and as a result, the vibration of the speaker is not transmitted to the floor, and the vibration transmission is blocked.

When used in the audio field, if this natural vibration frequency is less than the lower limit of the human audible frequency, it can be considered that the transmission of vibration from the speaker to the floor, which can be a problem, can be effectively prevented.
Since the lower limit of the human audible frequency is generally about 20 Hz, it can be seen from the above calculation results that the required performance can be sufficiently exerted even if the wire length is about 10 mm. Therefore, the insulator according to the present invention can be realized with a sufficiently small size. For example, even when the insulator is used for general households, the application is extremely simple without requiring a large space.

Here, further studies are made on the form of vibration generated from the speaker. As is well known, a loudspeaker is a loudspeaker body having a vibration plate mounted in a wooden box with a vibration direction substantially horizontal. Therefore, the initial operation of each sound emitted from the speaker one after another has the following phenomenon.
That is, the diaphragm is strongly moved in the horizontal direction for the first time, and the box is driven in the horizontal direction by the reaction. The vertical vibration generated in the box is considered to be due to the back pressure in the box due to the vibration of the diaphragm. Therefore, it is extremely important for the insulator to reliably absorb the initial horizontal vibration from the speaker.

However, in the insulator according to the present invention, the lower end of one wire 13 is coupled to one point of the lower cover portion 33 of the second support member 30 integrated with the speaker. Thus, a configuration in which one point is directly suspended by a single wire is realized. As a result, as can be seen from the verification test results described in the fifth embodiment to be described later, as shown in Patent Document 1, the speaker is not directly suspended by a wire, but is suspended by a leaf spring. Depending on the case, great superiority or inferiority in vibration isolation characteristics occurs.
In the present invention, this is presumed to be because the above-described configuration realizes a simple and free so-called pendulum vibration and reliably absorbs the initial horizontal vibration of the speaker. On the other hand, in the case of Patent Document 1, since the initial vibration from the speaker is suspended by a plurality of (four) wires via a leaf spring, the amount of distortion caused by the leaf spring is further reduced to each of the four wires. It is presumed that the vibration is transmitted in a complicated manner in the route No. 1 and a simple and free pendulum vibration cannot be obtained, and as a result, the horizontal initial vibration of the speaker cannot be absorbed reliably.

  As described above, Patent Document 2 described above is not applied to the fine audio field, but as a shape, the spring is located on the first support member side in the present application, and the wire The second support member is coupled to the lower end of the frame. However, it is easily imagined that the vibration component transmitted to each wire becomes a complicated phenomenon when the vibration transmission in the horizontal direction is assumed in the structure suspended by a plurality of (four) wires as in Patent Document 1. It is presumed that simple and free pendulum vibration as in the present invention cannot be expected.

  As described with reference to FIG. 1, since three or four insulators are used for one speaker, the entire speaker is hung with a plurality of wires. However, when viewed from the range covered by the vibration isolation and absorption operation that each insulator covers, each insulator is in a position far from the separation, and as far as this vibration isolation and absorption operation is concerned, each insulator may be considered to be independent of each other. It can be said that the pendulum motion that contributes to the above is performed with a single wire.

Next, the operation of vibration isolation absorption in the vertical direction will be described. As described above, the horizontal vibration component is the main vibration generated by the speaker, but the vertical vibration component cannot be ignored. This vertical vibration component cannot be absorbed by the wire pendulum phenomenon.
Therefore, the elastic member in the present invention bears the absorbing operation for the longitudinal vibration component. Describing in accordance with the previous embodiment, in the insulator 5 in FIG. 3, a combined body of the support portion 12 and the relay portion 14, in the insulator 5A in FIG. 4, in the disk portion 21, and in the insulator 5B in FIG. The elastic members 29 correspond to each other.

In this case, in the same manner as described in the previous horizontal vibration absorption, the free vibration when the free vibration system is considered to be established between the first support member and the second support member via the wire 13. It is necessary to set the elasticity of these elastic members so that the natural vibration frequency in the vertical direction (vertical direction) is less than the lower limit (about 20 Hz) of the human audible frequency.
Therefore, the design of each elastic member may be set according to the shape and the material and size so as to satisfy the above conditions. Unlike the above-mentioned case of the pendulum phenomenon by the wire, any type of elastic member is designed. Even if it exists in a member, the magnitude | size of the load applied to the said elastic member will influence.
In consideration of this point, as described above, by making the elastic member 29 an independent component as shown in FIG. 5, other components are common, and only this elastic member 29 has a plurality of types corresponding to the weight of the speaker. By preparing, all speakers can be dealt with, and there is an advantage that product cost can be reduced.

Embodiment 5 FIG.
The contents of the verification of the performance of the insulator according to the present invention will be described in detail below as a fifth embodiment.
By the way, as described above, this type of insulator is mostly manufactured and sold as a customer segment of so-called audio enthusiasts who are strongly concerned with the sound reproduced from the speakers. A wide variety of products are commercially available.
The effects of using these insulators are judged by actually listening to them with human ears. For example, they are so delicate that they cannot be judged by mechanical methods such as comparing acoustic waveforms detected by a microphone. It is thought that the actual situation is that each manufacturer devises and sells a unique abstract catchphrase rather than momentum and performance.

In view of the above circumstances, the inventor of the present application has devised a new method for objectively verifying the insulator according to the present invention developed this time. Although it must be quite maniac content from the background, the verification method and the verification result will be described in detail below.
First, the feature points are listed.
1) A human ear is used as a sensor for detecting the reproduced sound, and high detection sensitivity that cannot be obtained by a method such as waveform analysis or frequency analysis is ensured.
2) When two different pitches (sound pitch = sound frequency) are generated at the same time, beats (beats) are generated or generated in the human ear due to the relationship between the two heights (frequency). A phenomenon that does not exist is observed. In the developed method, the objectivity of verification is improved by focusing on the above-mentioned phenomenon of presence or absence of beats, rather than the subjective grasp of generally speaking, for example, soft, hard, bright, dark, etc. Yes.
3) The reliability of comparison results is ensured by using high-performance headphones that are not affected by insulators as standard devices for comparison with experiments using speakers.

Next, a specific verification method will be described.
As is well known, the current piano tuning is generally performed with an equal temperament obtained by dividing one octave into 12 equal parts. This is said to be able to perform safely without any turbidity of chords in any tonality, but it can be said that a slight turbidity occurs in most chords when viewed in reverse. . For this reason, it is said that some pianists do not necessarily perform the tempering with the equal temperament, but may perform with a tune different from the equal temperament depending on the music and the preference of the pianist.

The inventor of the present application devised this verification method by creatively paying attention to the relationship between the tuning of this piano and the sound of chords.
In other words, a pitch of 5 degrees (for example, “do” and “so”) is originally 2/3 in frequency and should be heard as a clear sound with no beat. However, when playing on the piano, as described above, beats can occur due to the tuning and the tonality of the music.
Therefore, a CD with the following two songs recorded by the following two famous pianists who are assumed to use different rhythms is played, and the presence or absence of a beat at each part where the key is hit five times is checked. Verified in case.

Pianist 1: Glenn Gould (Canada)
Pianist 2: Valery Afanashev (Russia)
Performance 1: J. S. Bach composition equal temperament piano tune Vol.1 No.1 in C major Performance No.2: No.8 in E flat minor Standard headphones: HD650 type headphones made by Sennheiser (distortion is less than 0.05% in the world) And has the reputation as the lowest distortion product)
Types of speakers used Speaker 1: Danish B & O BioLab3 type (speaker with built-in digital amplifier) Speaker 2: British Tannoy IIILZ type (classic type speaker)
Speaker 3: Marquis 300 type (classical type speaker) manufactured by Electro Voice
Speaker 4: La Scala type (all horn type speaker) manufactured by CLIP Push Inc.

Listed below are the results of the trial listening. However,
X indicates that a beat is observed, ◎ indicates that a beat is not observed, and ○ indicates that a beat is difficult to confirm.
In addition, the insulator set indicates a case where it is set in the state shown in FIG. 5, and the insulator reverse set is a case where it is set upside down with respect to FIG. 5, as previously introduced in Patent Document 1, This is equivalent to a state in which the speaker is not suspended directly from the lower end of the wire but suspended from the wire via a spring that is an elastic member.

Pianist 1 pianist 2
Case 1: Using headphones
Performance 1 x ◎
Performance 2 ◎ ×
Case 2: Speaker 1 used 2-1) No insulator Performance 1 1
Performance 2 ◎ ◎
2-2) Insulator Set Performance 1 x ◎
Performance 2 ◎ ×
2-3) Insulator reverse set performance 1 ○ ◎
Performance 2 ◎ ○
Case 3: Speaker 2 used 3-1) Insulator-free performance 1 ◎ ◎
Performance 2 ◎ ◎
3-2) Insulator Set Performance 1 x ◎
Performance 2 ◎ ×
3-3) Insulator reverse set performance 1 ◎ ◎
Performance 2 ◎ ◎
Case 4: Use of speaker 3 4-1) No insulator Performance 1 ◎ ◎
Performance 2 ◎ ◎
4-2) Insulator Set Performance 1 x ◎
Performance 2 ◎ ×
4-3) Insulator reverse set performance 1 ◎ ◎
Performance 2 ◎ ◎
Case 5: Speaker 4 used 5-1) No insulator Performance 1 ◎ ◎
Performance 2 ◎ ◎
5-2) Insulator Set Performance 1 x ◎
Performance 2 ◎ ×
5-3) Insulator reverse set performance 1 ◎ ◎
Performance 2 ◎ ◎

The following can be understood from the above experimental results. That is,
1) When using the standard headphones, it was clearly observed that there was a difference in the presence or absence of beats depending on the pianist and the performance. As described above, the tuning method differs depending on the pianist, which is considered to reflect the difference in the tonality of the performance.
2) When the insulator is not used, the beat is not observed in almost all cases, and since the speaker is installed directly on the floor, distortion occurs in this transmission portion, making it impossible to distinguish in each case. Inferred.
3) On the other hand, when the insulator is correctly set in its original position as shown in FIG. 5, the same result as in the case of using headphones as a standard device is observed with respect to the presence or absence of beats in all the speakers tested. This is a proof that the loudspeaker accurately reproduces and outputs the original sound without distortion, and demonstrates the above-described excellent characteristics of the insulator according to the present invention.
4) Furthermore, when the insulator is set upside down, the result is almost the same as when the insulator is not used, and it can be seen that it does not function as an insulator without distortion. This reverse set is a simulation of the case of Patent Document 1, but in the actual Patent Document 1, each insulator has a structure in which one place of the speaker is suspended by four wires as described above. Yes, it can be said that there is a high possibility that the suspension structure becomes complicated and further deteriorated from the result of this experiment.

  Although the subjectivity of the human being who listens to the playback sound can hardly be entered into the above verification method, a similar experiment was conducted with several observers just in case, but all the results were the same. I have confirmed.

  From the verification results described above, the following can also be said. That is, the insulator according to the present invention can faithfully reproduce the original sound of the speaker by acoustically insulating the speaker from the floor without adding any distortion. Setting it does not necessarily create a comfortable, easy-to-listen sound.

Although verification of the case where the insulator is inserted between a CD player, an amplifier or the like and a rack or the like is not mentioned, there is a change in the reproduced sound when the insulator according to the present invention is actually used. As described above, the insulator prevents the vibration transmitted from the floor to the CD player or the like. However, the insulator can be inserted even when the presence of the vibration is not considered on the floor. It has been observed that the sound changes.
This phenomenon is not as easy to understand as in the case of a speaker, but a metal casing that constitutes a CD player or amplifier is set to a ground potential, and this casing has a part of its internal circuit. It is connected. The housing can be slightly deformed by the signal and current flowing in this circuit. However, if the deformation changes nonlinearly depending on the installation orientation of the housing, the signal and current flowing in the housing will be distorted. It is said that the influence of the nonlinear deformation appears in the output signal.

  Therefore, by installing these CD players on the insulator according to the present invention, the mechanical stress generated in the casing in a state where the CD player is substantially lifted is released, and the above nonlinearity is suppressed. The sound quality can be improved. In fact, as a result of actually testing the insulator according to the present invention on a CD player with an amplifier, a clear sound with no wrinkles was obtained so that it was found that there was a sound peculiar to the case.

Embodiment 6 FIG.
As described in the previous embodiments, when the insulator according to the present invention is applied to, for example, a speaker, a state where the speaker is lifted off the floor is reproduced. In fact, as illustrated in FIG. 1, when four or three insulators according to the present invention are arranged on the floor, a speaker is further installed on the floor, and the upper end of the speaker is lightly pressed, it can be easily swung. . In particular, in the case of a tall speaker, this shaking becomes large, and there is a concern that the user may be worried that the speaker may fall down when an earthquake occurs.
Of course, in order to fulfill the sound insulation function inherent to the insulator, there is no need to guarantee such a large amplitude fluctuation.

  The sixth embodiment is newly devised from the above background and viewpoints, and aims to improve the earthquake resistance at the user's use site without impairing the above-described excellent performance of the insulator according to the present invention. To do.

  FIG. 6 is a perspective view showing the state of use of the insulator according to the sixth embodiment of the present invention. Here, four insulators 5C are attached to a common plate member 35 and installed on the floor surface, and a speaker is mounted thereon. 3 is loaded. In FIG. 6, the speaker 3 is indicated by a broken line.

  FIG. 7 is a cross-sectional view showing details of a mounting portion between the insulator 5C and the plate member 35. As shown in FIG. In the figure, the insulator 5C is the same as the insulator 5B described in FIG. That is, the first support member 25 includes a bottom plate portion 26 and a spring base portion 28 coupled to the bottom plate portion 26 via a support column portion A27, and a spring 29 that is an elastic member has a lower side portion at the lower side portion. The upper end of the wire 13 is connected to the upper side of the spring base 28, and both are the same as in FIG.

Unlike the case of FIG. 5, the second support member 30 </ b> A has a structure in which the upper lid portion 31 and the lower lid portion 33 to which the lower ends of the wires 13 are coupled are coupled only via the support column B <b> 34. The side part 32 is not used.
As shown in FIG. 6, the plate member 35 has an area larger than the bottom surface of the speaker 3 (corresponding to the second object 9). Specifically, the periphery of the plate member 35 is larger than the periphery of the speaker 3. The area is set to be located outside the predetermined dimension. As shown in FIG. 7, the thickness of the plate member 35 is set such that the front and back surfaces thereof are flush with the upper surface of the upper lid portion 31 and the lower surface of the lower lid portion 33, respectively.

Then, a plurality of (four in four corners in FIG. 6) through holes 35a are provided along the vicinity of the periphery of the plate member 35, and as shown in FIG. 7, at the upper and lower ends of the inner surface of the through hole 35a. The formed stepped portion is fitted to the stepped portions formed on the peripheral edges of the upper lid portion 31 and the lower lid portion 33, whereby the insulator 5C is attached to the plate member 35 integrally. Precisely, each of the second support members 30A (the upper lid portion 31 and the lower lid portion 33) of the four insulators 5C and the plate member 35 have an integral structure.
In this case, the attaching operation is performed by first inserting the member from which the upper lid portion 31 is removed from the insulator 5C from below the through hole 35a of the plate member 35, and fitting the peripheral edge of the lower lid portion 33 into the lower end of the through hole 35a. Thereafter, the upper lid portion 31 is attached from above so that the peripheral edge fits into the upper end of the through hole 35a, and is tightened and integrated with the column portion B34 with a screw.

  FIG. 8 is a cross-sectional view showing an insulator 5D obtained by further modifying the insulator 5C shown in FIG. Only differences from FIG. 7 will be described. That is, in FIG. 8, the plate member 36 has an upper surface abutting against the second horizontal surface 9A, and a recess 36a is formed at a position corresponding to the through hole 35a in FIG. The lower lid portion 33 is fastened and fixed to the periphery of the lower end of the concave portion 36a with a screw (not shown), so that the spring base 28, the spring 29, and the wire 13 are accommodated in the concave portion 36a.

Therefore, in the insulator 5D of FIG. 8, the lower cover portion 33 and the plate material 36 constitute a second support member 30B.
The operation described below is the same as that of the insulator 5D of FIG. 7 as well as the insulator 5D of FIG.

  Next, the operation will be described. However, as can be seen from FIG. 6, the speaker 3 is mounted on the plate member 35 configured integrally with the insulator 5 </ b> C, and therefore, without adding any distortion mainly described in the fourth and fifth embodiments. It is clear that the function of acoustically isolating the speaker from the floor can be performed in exactly the same way, and the description will not be repeated.

Therefore, hereinafter, an operation when vibration is applied to the insulator 5C, the plate member 35, and the speaker 3 shown in FIG. The main component of vibration caused by earthquakes is a frequency that is generally lower than the audible frequency of the audio field described above. Accordingly, in FIG. 7, the vibration of the floor 8 is caused by the first support member 25 (the bottom plate portion 26, the support column portion A27, the spring base portion 28), the spring 29, the wire 13, and the second support member 30A (the lower lid portion 33). , Support column B 34, upper lid portion 31), and plate material 35, are transmitted to speaker 3.
In FIG. 8, the vibration of the floor 8 is caused by the first support member 25 (bottom plate portion 26, support column portion A27, spring base portion 28), spring 29, wire 13, and second support member 30B (lower lid). It is transmitted to the speaker 3 through the part 33 and the plate material 36).

Here, the horizontal component of the floor vibration is transmitted to the speaker 3 by absorbing a certain amount mainly by the pendulum movement of the wire 13. Further, the vertical component of floor vibration is transmitted to the speaker 3 by being absorbed by a certain amount mainly by the elasticity of the spring 29.
In the present invention, as shown in FIG. 7, each insulator 5C is suspended by a single wire 13, so that each insulator 5C is inclined at a free angle instantaneously from the floor surface. It has a structure that can be done.
As a result, the plate member 35 and thus the speaker 3 installed thereon swings smoothly, and the swinging motion is a seesaw motion about the center of gravity of the speaker 3.

For example, in FIG. 6, when the moment when the speaker 3 is swung in the clockwise direction when viewed from the front is considered, the spring 29 of the right insulator 5C is compressed and contracted more greatly than the spring 29 of the left insulator 5C. As a result, the reaction force becomes larger. That is, these four insulators 5C automatically act to suppress the swing amplitude of the speaker 3.
Further, as described above, the fact that the plate member 35 is smoothly swung by adopting the suspension structure with one wire 13 does not cause an excessive slip between the speaker 3 and the plate member 35. The possibility that the speaker 3 slides down from the plate material 35 at the time of occurrence is also reduced.

  Of course, earthquakes are a natural phenomenon and there is no upper limit on their amplitude. Therefore, when an earthquake with an amplitude exceeding the expectation occurs, the swinging amplitude of the plate member 35 becomes excessive, and there is a possibility of falling. In this case, in the sixth embodiment of the present invention, as shown in FIG. 6, the area of the plate member 35 is set so that the periphery of the plate member 35 is located outside the predetermined dimension from the periphery of the speaker 3. Compared to the case where is directly installed on the insulator, the tip of the plate member 35 abuts against the floor surface at a stage where the swing amplitude is smaller, so that the tipping is prevented.

In the case where the speaker 3 has a shape that is not too tall and difficult to fall over compared to the floor area, the plate material 35 may of course have an area that is the same as or smaller than the area of the speaker 3. is there.
Further, when only a plurality of insulators described in the first to third embodiments are used without using a plate material, as described above in the sixth embodiment, one insulator is used in one insulator. Since each insulator can be tilted from the floor instantaneously at a free angle, as a result, the speakers installed on these insulators swing smoothly, In addition, the effect of the present invention is exhibited as it is, that the swinging amplitude is automatically suppressed by the action of the spring and safety is ensured.

  Further, when attention is paid to the operation characteristics and effects unique to the insulator according to the present invention with respect to external vibration such as an earthquake described in the sixth embodiment, the second object 9 is assumed to be a seismic isolation device, for example, a precision device. It can be said that the present invention is extremely effective as a device. Of course, the characteristics of the whole body as an insulator, the thickness of the wire, the strength of the length, the characteristics of the spring tension, the strength, etc., are the case of the so-called audio insulator described in the first to third embodiments. However, it is possible to apply the same configuration as the configuration of the invention.

3 speakers, 4 floors, 5, 5A, 5B, 5C insulators,
6 LP player, 7 racks, 8 first object, 8A first horizontal plane,
9 Second object, 9A Second horizontal plane, 10, 18, 25 First support member,
11 base part, 12 support part, 13 wire, 14 relay part,
15, 22, 30, 30A, 30B second support member, 16, 23 main body,
17, 24 fixing part, 19 substrate part, 20 side plate part, 21 disc part, 26 bottom plate part,
27 Column part A, 28 Spring base part, 29 Spring, 31 Upper cover part, 32 Side part,
33 Lower lid part, 34 Supporting part B, 35 Plate material, 35a Through hole, 36 Plate material,
36a Recess.

Claims (8)

Interposed between a first horizontal plane at the upper end of the first object and a second horizontal plane located above the first horizontal plane at the lower end of the second object positioned above the first object; In an insulator for suppressing vibration from either one of the two objects from being transmitted to the other of the two objects ,
The second object is a speaker provided with a diaphragm in a box in a posture in which the vibration direction is substantially horizontal.
The first support member lower surface is larger abutting rigid with the first horizontal surface, provided for each location for supporting the speaker, the upper end thereof coupled to said first support member through the elastic member, a plurality this thin line of twisted single wire consisting of the line than, and the elastic member and the suspended upper surface from said first support member through the wire by being coupled directly to the lower end of the wire is the first the Rukoto comprising a large second support member abutting rigid second horizontal plane, the pendulum the second of the speaker placed on the upper surface of the support member, the horizontal direction, the upper end of the wire as a fulcrum A configuration that allows free vibration of single vibration of movement,
An insulator in which the length of the wire is set so that the natural vibration frequency determined by the following expression is less than the lower limit of the human audible frequency when the free vibration is possible .
fh = √ (G / l) / (2 · π)
Where fh: natural vibration frequency, G: gravitational acceleration, l: wire length. A plurality of the first support members are provided for each portion for supporting the speaker, and each of the first support members includes a bottom plate portion that is in contact with the first horizontal plane and a first support column having a predetermined length. And a plurality of the elastic members, each elastic member having a plate having a predetermined thickness and width in a substantially U shape, and one of the long sides of the elastic members. The second support member includes a spring coupled to the spring base and coupled to the other of the long sides of the wire. The second support member has a top surface abutting against the second horizontal surface and a bottom surface opened. Is fixed to the peripheral edge of the lower end of each concave portion of the plate so that the plate is formed between the bottom plate portion and the spring base portion for each portion supporting the speaker along the periphery. A plurality of lower lid portions directly coupled to the lower ends of the plurality of lower lid portions, Wherein the portion each spring base part, insulator of claim 1, wherein formed by accommodating the respective spring and the respective wires. An insulator provided for each portion that supports the speaker,
The first support member includes a bottom plate portion that is in contact with the first horizontal plane, and a spring base portion that is coupled to the bottom plate portion via a support column having a predetermined length, and the elastic member has a predetermined thickness and A plate having a width is formed in a substantially U shape, and includes a spring in which one of the long sides is coupled to the spring base and the other end of the long side is coupled to the upper end of the wire. The upper lid is in contact with the second horizontal plane, and is coupled to the upper lid via a predetermined length side portion so as to be positioned between the bottom plate and the spring base, and the lower end of the wire is directly coupled. The insulator according to claim 1, further comprising a lower lid portion . An insulator provided for each portion that supports the speaker,
The first support member includes a bottom plate portion that is in contact with the first horizontal plane, and a spring base portion that is coupled to the bottom plate portion via a first pillar portion having a predetermined length, and the elastic member includes: A plate having a predetermined thickness and width is formed in a substantially U shape, and includes a spring in which one of the long sides is coupled to the spring base and the upper end of the wire is coupled to the other long side. The member is coupled to the upper lid part via a second column part having a predetermined length so as to be positioned between the upper lid part contacting the second horizontal plane and the bottom plate part and the spring base part. The insulator according to claim 1, further comprising a lower lid portion having a lower end directly coupled thereto . A plate material in which a plurality of through holes are formed for each portion supporting the speaker along the vicinity of the periphery is provided, and the periphery of the upper lid portion and the lower lid portion is supported by the upper end and the lower end of the inner surface of each through hole The insulator according to claim 4, wherein the plurality of insulators according to claim 4 and the upper lid portion and the lower lid portion are integrally attached to the plate member . 6. The insulator according to claim 2, wherein the plate material has an area set so that a peripheral edge of the plate material is located outside a predetermined dimension from a peripheral edge of the bottom surface of the speaker . The spring according to the magnitude of the load applied to the insulator so as to exhibit a predetermined amount of deformation within the proportional elastic limit when the speaker is placed on the first object via the insulator. The insulator according to any one of claims 2 to 6, wherein the spring strength is set . In the state where the speaker is not loaded, the spring is configured such that the spring base portion of the first support member and the lower lid portion of the second support member abut on each other based on the elastic force of the spring. The insulator according to claim 7 .

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