JP5812616B2 - Insulator and method for supporting audio equipment using insulator - Google Patents

Description

  The present invention relates to an insulator used for speakers, amplifiers, CD players, analog players, and the like, which are audio devices, and a method for supporting these audio devices.

  In the audio field, the pursuit of sounds that are as close as possible to the original sound has been made in each component such as an amplifier, a speaker, a CD player, and a cable. Despite the transition from the analog to the digital era and the introduction of various innovative technologies, the technology from the recording to playback is still limited, and the original sound is so perceptible to human hearing. Is currently not faithfully reproduced. One of the factors that an audio device cannot follow the original sound (for example, the sound of an orchestra's live performance) is the effect of vibration on the audio device. As is well known, audio devices generate vibrations themselves and are affected by various vibrations from the outside. In the case of an amplifier, a “beat” occurs due to the AC basic signal of the power transformer and its harmonic components. In the case of a CD player, the motor that rotates the disk is the source of vibration. In the case of a speaker, the reaction force of the voice coil that drives the cone vibrates the speaker enclosure (box) body. This vibration is transmitted to the floor surface where the speakers are installed, and excites the complex natural vibration mode of the entire room including the floor surface. Disturbance vibration intricately superimposed on the original sound causes the speaker body to vibrate again. The hypothesis that the intermodulation distortion (subharmonics) generated at this time deteriorates the sound quality of the audio equipment has been proposed, but the vibration caused by the mutual interference between the audio equipment and the installation surface reduces the quality of the reproduced sound. It seems that there is no doubt that it is an important factor.

  An insulator is one that improves the sound quality of audio equipment. In the analog era, in order to suppress howling, an insulator is mainly installed between the analog player and the floor, and is essential as a means for blocking vibration transmission. Moving from analog to CD players, insulators are no longer a howling prevention measure, but are used as tuning means to improve the sound quality of audio equipment and adjust to the listener's preferred sound. Although it is well known that the sound quality changes due to the application of insulators, the mechanism that brings about the effect is not well understood theoretically, and it has been developed empirically and through trial and error. Many. There are the following three types that have been used as insulators in the past.

(1) Insulator with spike structure This type of insulator is composed of a conical spike and a spike receiver, and is often used for installation of speakers or audio boards. For example, Japanese Patent No. 3848987 (Patent Document 1) discloses a structure in which a plurality of spikes are arranged in series.

  The vibration preventing support device having a double spike structure shown in FIG. 15 includes a spike receiver 600, a first spike 601, a second spike 602, and a liquid 603 placed in the spike receiver 600. The first spike 601 is inserted into the lower end of the spike receiver 600 such that the cylindrical portion is in contact with the inner wall of the spike receiver 600. Similarly, the second spike 602 has the apex of the conical portion placed in a recess provided at the center of the upper surface of the first spike 601. The liquid 603 filled in the narrow gap between the spike receiver 600 and the first spike 601 has an effect of insulating the vibration between the members 600 and 601.

(2) Insulator made of hard material Another type of insulator uses hard material. In recent years, in place of the above-described buffer body, a hard material intended to effectively absorb the vibration generated by the audio equipment and release it to the outside, such as wood, resin, metal, ceramics, etc., and these A composite type with a multi-layer structure is devised and commercialized. This composite type is disclosed in JP-A-10-246284 (Patent Document 2). In the case of a hard insulator, it is used as a playback sound tuning means using a character of a high-quality acoustic material. For example,
(A) Metal-based material
Brass: bright and brilliant sound
Copper: Solid and powerful Silver: Good core, quick start and fall of sound Gold: Plump and glossy
(B) Wood-based materials
African ebony: Hard but not exciting sound (used for musical instruments)
Striped ebony: softer than African ebony Cherry: soft and pure

(3) Floating type insulator This type of insulator is intended to prevent vibration (shut out), and uses a shock absorber with low rigidity. Examples of the buffer include those using a rubber material, those using a spring coil, an air floating board containing air, and those using the repulsive force of magnetic force.

Patent No. 3848987 Japanese Patent Laid-Open No. 10-246284 Japanese Unexamined Patent Publication No. 2006-200734 Japanese Patent Laid-Open No. 10-246284

  Hereinafter, the problems of the above-described three conventional methods as audio insulators are summarized as follows.

(1) Insulator problem with spike structure Insulator with spike structure has the effect that vibration is easily transmitted in the direction of "audio equipment-> cylindrical part-> conical part->saucer->floor", but not in the opposite direction. It is used. However, vibrations at low frequencies (for example, several tens of Hz or less) cannot be attenuated. The same applies to the case of a spike having a conical shape and when the spike is combined in multiple stages in series. Patent Document 1 discloses a method in which silicon oil, which is a viscous fluid, is sealed in a narrow gap between a cylindrical surface of a spike and a spike receiver that houses the cylinder. However, since the vibration damping action by the viscous fluid is proportional to the frequency, it is difficult to obtain the vibration damping effect at a low frequency.

(2) Problems of hard material insulators In the case of hard material insulators, high-frequency vibrations generated by audio equipment can be effectively absorbed and released to the outside by selecting a high-quality acoustic material. However, the point that the low frequency vibration cannot be attenuated is the same as the spike method. The floor of a private house where speakers are installed usually has a distributed vibration mode with an eigenvalue of 20 to 100 Hz. As described above, when the vibration of the speaker is transmitted to the floor surface, the complex natural vibration mode of the entire room including the floor surface is excited. The deterioration of sound quality caused by the mutual interference between the low-frequency floor vibration and the vibration of the speaker body cannot be basically avoided in the hard material insulator as in the spike method.

(3) Problems with the floating type insulator In the case of the rubber insulator described above, the excessive vibration suppression action due to the viscoelasticity of the rubber attenuates the high frequency components that give sound to the sound, so the outline of the sound becomes ambiguous. There was a drawback that the sound quality was turbid.
In the case of the spring method, the natural vibration that is determined by the spring stiffness and the mass of the load and multiple harmonic vibrations occur over a wide frequency range, so how to avoid the effects of this vibration on the sound is a major issue. It becomes.

  In the case of an air floating board and an insulator that uses the repulsive force of a magnetic force, the audio device can float with no contact with the floor surface. Due to this completely non-contact levitation, effects such as sound transparency, three-dimensional effect, and improvement in resolution are attracting attention. On the other hand, the vibration transmitted from the audio equipment to the floor is completely cut off by the insulator, so it is more difficult to tune the sound quality according to the listener's preference, music genre, etc. There was a drawback of becoming immersive. In addition, in the case of completely non-contact floating type (low rigidity floating type), depending on the speaker to be applied, the low-range power feeling and localization feeling will be lowered, the bass will not be tightened and the unnatural feeling floating in space (boomy) The disadvantage of becoming.

The present invention has been made in view of the above-described problems, and includes the following (1) and (2) methods (1) spike-type insulators (2) floating-type insulators.

  That is, the spike method of the above (1) using the effect that the vibration is easily transmitted in one direction and is not easily transmitted in the opposite direction, and the above-described shortage of the vibration blocking effect at low frequencies, which is a weak point of the spike method. It is noted that by combining the floating method (2), the vibration blocking action can be obtained more effectively in the entire frequency range above the audible range. According to the present invention, it is possible to avoid the influence of vibration due to mutual interference between the audio device and the installation surface, and it is possible to further improve acoustic characteristics such as a sense of depth, resolution, and transparency. In addition, since the spring used in the floating method can be made highly rigid, it is possible to greatly improve the weakness of the floating method, such as low-frequency sensation, boomy phenomenon, and support stability of audio equipment.

  Specifically, the invention of claim 1 includes a fixed portion of an elastic member, a load support portion provided on the elastic member, vibration generation preventing means for suppressing higher-order resonance phenomena of the elastic member, and the load. The spike tip receiving portion formed on the support portion, or a disc portion that is mounted on the load support portion and can support the spike tip directly or with a receiving tray mounted thereon.

That is, the present invention can have the following advantages (i) and (ii).
(I) Advantages of insulators using spikes (ii) Advantages of floating insulators

  The floating method compensates for the one-way transmission characteristics of the spike type insulator provided inside the insulator or on the audio device side, and the low-frequency vibration isolation effect that cannot be obtained with the spike method. In addition to avoiding the influence of vibration due to mutual interference, the acoustic characteristics such as sense of depth, resolution, and transparency can be further improved dramatically. In the high frequency range, the spike-type vibration isolation effect compensates, so a highly rigid spring can be selected. As a result, it is possible to configure an insulator that can greatly improve the weak points of the floating system (installation stability, low-frequency feeling).

  Specifically, in the invention of claim 2, the elastic member is constituted by a mechanical spring.

  That is, in the present invention, as a mechanical spring, a spring coil, a conical coil spring, a disc spring, or a structure in which the disc springs are stacked in multiple stages, a bamboo shoot spring, a ring spring, a spiral spring, a thin plate spring, a stack plate spring, a U-shape It can be selected in consideration of the shape and dimensions required for an audio insulator such as a mold spring.

  Specifically, the invention according to claim 3 sets the spring stiffness of the elastic member so as to obtain a vibration isolating action at 20 Hz or less by a vibration isolation characteristic determined by the mass of the mounted object and the spring stiffness of the elastic member. It is a thing.

That is, in the present invention, when the audible frequency range limit value f ₀ = 20 Hz, an eigenvalue determined by the mass of the load and the spring stiffness of the elastic member is set so that a vibration damping effect is obtained at f> f ₀ . By doing so, the vibration cutoff effect in the low frequency range which cannot be obtained by the conventional spike method is obtained.

  Specifically, the invention of claim 4 uses a spring coil as a mechanical spring, and the approximate wire diameter of the spring coil is set in the range of φ3 to φ6 mm.

That is, in the present invention, a spring coil with a thick wire diameter is a concentrated spring whose rigidity can be easily adjusted by selecting the outer diameter and the number of turns when viewed macroscopically, and an acoustic tube that propagates high-frequency sound waves when viewed as a micro phenomenon. It focuses on the fact that it can play the role of (sound tube). The transmission of vibration from “audio equipment → spike → intermediate support member → acoustic tube (spring coil) → floor surface” is _defined as a vibration propagation path Φ _z . The high-frequency vibration generated by the audio device is released to the outside through the vibration propagation path Φ _z , so that the playback sound can be tuned using the character of the acoustic material.

Specifically, in the invention of claim 5, the vibration propagation path from the load support portion to the elastic member is made of a material having a specific acoustic impedance of 10 ⁷ Ns / m ³ or more.

That is, in the present invention, a material (z> 10 ⁷ Ns / m ³ ) having a large specific acoustic impedance at the same level as the spring coil (steel) is used for the vibration propagation path Φ _z from the load sleeve to the spring coil. The sound wave incident on the upper sleeve from the audio device can be smoothly transmitted into the acoustic tube (spring coil). As a result, the playback sound can be effectively tuned using the characters of high-quality acoustic material.

  Specifically, in the invention of claim 6, the disk portion is configured to have a substantially concave cross section so as to prevent a side slip of a spike tray installed in the disk portion.

  In other words, according to the present invention, the cross section of the storage member has a substantially concave shape, so that even when the entire spring structure is inclined, or even when the insulator and the audio device slide relative to each other, the spike receiver slides sideways. Thus, it does not fall from the disk portion.

  Specifically, in the invention of claim 7, a spike structure portion is constituted by a spike cone portion, a spike column portion, and a spike side load support portion for supporting a load of an audio device, and the spike tip receiving portion includes the spike cone. The spike column portion is accommodated in a cylindrical portion formed in the fixed portion so as to be slidable in the axial direction through a narrow gap.

  In other words, the present invention has the advantages of both spike type and floating type insulators, and the spike column part is accommodated in the fixed part of the elastic member so as to be slidable in the axial direction through a narrow gap. Therefore, the insulator can be easily installed on the audio device, and can be stably supported even when a radial load is applied to the spike structure.

  Specifically, the invention of claim 8 is directed to a spike structure portion when a portion constituted by a spike cone portion, a spike column portion, and a spike side load support portion installed on the audio equipment side is a spike structure portion. And the insulator described in claim 1 is combined to support the audio device.

  That is, in the present invention, the simplified insulator structure can have the advantages of the spike type insulator and the floating type insulator.

Specifically, the invention of claim 9 has a vibration propagation path Φ _R branched from a vibration propagation path Φ _Z extending from the spike side load support portion to the inside of the elastic member, and the vibration propagation path Φ _R is roughly It consists of a cylindrical shape member.

That is, in the present invention, the vibration propagation path Φ _Z is combined with a wind chime vibration system Φ _R. The vibration system Φ _R is a vibration determined by the mass of a distributed constant system and a spring arranged in parallel with the vibration propagation path Φ _Z with the end of the cylindrical shape member (upper sleeve) as the open end of the vibration propagation path Φ _R. As a system, it affects the vibration propagation path Φ _Z. The upper sleeve made of high-quality acoustic material has a number of natural vibration modes within the audible range (f <15000 Hz), and these multiple natural vibration modes are combined to create a deep tone in the reproduced sound. Give change. The high-frequency natural vibration mode improves the sense of sound field and localization in stereo reproduction.

Specifically, in the invention of claim 10, the substantially cylindrical member is made of a material having a specific acoustic impedance of 10 ⁷ Ns / m ³ or more.

That is, in the present invention, various kinds of high-quality acoustic materials (specific acoustic impedance is 10 ⁷ Ns / m ³ or more) considering the affinity of reverberations in a high frequency range can be selected according to the listener's sound preference.

  Specifically, in the invention of claim 11, the substantially cylindrical shape member uses a copper alloy.

  In other words, in the present invention, the upper sleeve (substantially cylindrical member) has good characteristics as an acoustic material, for example, brass, so that a deep tone and reverberation are added to the reproduced sound while being transparent. In addition, the sound localization, density, and scale are further greatly improved.

  Specifically, in the invention of claim 12, the copper alloy is used in the range of tin content of 1% to 25%.

  That is, in the present invention, by using a copper alloy having a high tin content, for example, “Sasari material”, an insulator having a rich and clear high-pitched sound characteristic is obtained. The reverberation of the sound added to the reproduced sound (space expanse) can be obtained even if the tin content is 1%. Increasing the content to 25% further enhances the effect of wind chimes as “sounding sound”.

  Specifically, in the invention of claim 13, the cylindrical portion formed by protruding from the lower central portion of the fixed portion, a through hole provided in the axial direction in the cylindrical portion, and the load through the through hole. The fastening member mounted on the support portion and the upper limit value of the relative axial distance between the fixed portion and the load support portion are regulated by the fastening member.

  In other words, in the present invention, by restricting the stroke upper limit value of the load support portion with the fastening member mounted through the through hole, it is possible to prevent the load support portion from being detached from the fixed portion. it can.

  Specifically, the invention of claim 14 supports an audio device by a spike type insulator arranged in series with a floating type insulator.

  That is, in the present invention, not only the spring coil but also an air floating method in which air is contained, a magnetic levitation method using a repulsive force of magnetic force, or a material using a rubber material can be applied as a floating type insulator. Either the floating method or the spike method can be used.

Specifically, the invention of claim 15 has a vibration propagation path Φ _R branched from a vibration propagation path Φ _Z extending from a load support part supporting a load of an audio device to a spike cone part in the spike type insulator, and This vibration propagation path Φ _R is constituted by the spike cone portion or a substantially cylindrical member that accommodates the spike cone portion.

  That is, in the present invention, the configuration in which the cylindrical wind chimes are provided in the spike structure portion can be widely applied as a spike type insulator in combination with a normal spike tray as a single component. In this case, although the vibration isolation effect in the low frequency range is lost, the acoustic characteristics with the wind chime effect can be improved as compared with the conventional spike type insulator.

  Specifically, the invention of claim 16 includes a fixing portion of the elastic member, a first load support portion provided on the elastic member, a vibration generation preventing means for suppressing higher-order resonance phenomenon of the elastic member, A cylindrical part mounted on the first load support part, a second load support part for supporting a load of an audio device provided on the cylindrical part, and a cylindrical part formed on the fixed part via a narrow gap The cylindrical portion is accommodated so as to be slidable in the axial direction.

  That is, in the present invention, even when a radial load or a moment load is applied to the second load support portion that supports the load of the audio device, the cylindrical portion is narrow in the cylindrical portion formed in the fixed portion. The spring coil can be expanded and contracted smoothly and the vibration insulation effect is not lost. Moreover, since the inclination angle of the second load support portion can be made small, the audio device can be stably supported.

  Specifically, the invention according to claim 17 provides a double spike support structure by supporting the tip of a spike cone portion installed on the audio equipment side with a second spike tip receiving portion formed on the spike side load support portion. It is what.

  In other words, in the present invention, a broader vibration isolation effect can be obtained by configuring the spike system having unidirectional vibration transmission characteristics in two stages and arranging the floating system in series.

  Specifically, the invention of claim 18 sets Δ <0.5 mm, where Δ is a narrow gap.

  That is, in the present invention, in the invention of claim 16, by setting the clearance between the cylindrical portion formed in the fixed portion and the columnar portion to be Δ <0.5 mm, the inclination angle of the second load support portion is sufficient. Therefore, the audio device can be supported stably.

  According to the present invention, an insulator having both (1) the advantages of the spike type insulator, (2) the advantages of the floating type insulator, and the above (1) and (2) can be realized. Vibration isolation effect can be obtained over a wide frequency range, avoiding the effects of vibration due to mutual interference between the audio equipment and the installation surface, and dramatically improving acoustic characteristics such as depth, resolution, and transparency it can. Further, since the insulator structure with high support rigidity can be obtained, a high rigidity spring that can avoid the weak points of the low rigidity floating system can be selected. As a result, an insulator excellent in both acoustic characteristics and support stability can be configured. The effect is remarkable.

FIG. 1A is a top cross-sectional view (A-A cross-sectional view of FIG. 1B), and FIG. 1B is a front cross-sectional view of an audio insulator showing Embodiment 1 of the present invention. Arrow view of an audio system using the audio insulator according to the first embodiment of the present invention. The graph of the analysis result of the vibration insulation effect in the low frequency range of a spring structure part in the audio insulator in Embodiment 1. Front sectional view of an audio insulator showing Embodiment 2 of the present invention Front sectional view of an audio insulator showing Embodiment 3 of the present invention Front sectional view of an audio insulator showing Embodiment 4 of the present invention Front sectional view of an audio insulator showing Embodiment 5 of the present invention Front sectional view of an audio insulator showing Embodiment 6 of the present invention Front sectional view of an audio insulator showing Embodiment 7 of the present invention The figure which shows the state which supported the audio equipment by insulator in Embodiment 7. Front sectional view of an audio insulator showing Embodiment 8 of the present invention Front sectional view showing the insulator structure when the floating method and the spike method with wind chimes are combined 12 is a front cross-sectional view showing the insulator structure when the arrangement of the spike irregularities is reversed in the structure of FIG. Front sectional view showing the insulator structure when the floating structure is combined with the spike structure installed on the audio equipment side Diagram showing a two-stage spike structure in a conventional insulator example

[First embodiment]
FIG. 1 shows an audio insulator according to Embodiment 1 of the present invention. FIG. 1a is a top sectional view (AA sectional view of FIG. 1b), and FIG. 1b is a front sectional view. The structure of the insulator is roughly divided into a spike structure portion 1 and a spring structure portion 2. 3 is an upper support part (spike side load support part), 4 is a spike column part, and 5 is a spike cone part. Spike structure portion 1 is constituted by members 3, 4, and 5. 6 is a member storage cylinder (fixed part), 7 is a lower base press-fitted and fixed to the bottom surface of the member storage cylinder, 8 is a cylinder formed by protruding from the center of the lower base 7, 9 Is a surging preventing member (vibration preventing means) mounted on the outer peripheral portion of the cylindrical portion 8. The surging preventing member 9 is composed of a cylindrical tube portion 9a and a plurality of viscoelastic pieces 9b protruding in the radial direction. Reference numeral 10 denotes a disk-shaped intermediate support member (load support portion) disposed on the upper portion of the lower base 8. The intermediate support member 10 is housed in the member housing cylinder portion 6 so as to be movable in the axial direction. A spring coil 11 (elastic member) is provided so as to be sandwiched between the intermediate support member 10 and the lower base 8. Incidentally, the elastic member in the present invention is not limited to a spring coil, and a magnetic type, an air type, etc. used for a floating type insulator can be applied. The outer periphery of the lower end of the spring coil 11 is fitted into the positioning portion 12 formed on the bottom surface of the lower base 7, and the outer periphery of the upper end of the spring coil 11 is fitted into the positioning portion 13 formed on the bottom surface of the intermediate support portion 10. Yes. Therefore, in a state where the spring coil 11 is mounted, it is possible to maintain a state in which the shaft cores of both the members 7 and 10 are matched. Reference numeral 14 denotes a spike tip receiving portion formed at the center of the upper surface of the intermediate support portion 10. The spike tip receiving portion 14 is formed with a recess having a conical section in order to accommodate the spike tip. Reference numeral 15 denotes a bearing portion formed on the upper portion of the member storage cylinder portion 6. The spike cylinder 4 is accommodated in the bearing 15 so as to be slidable in the axial direction with a narrow gap 16 interposed. In the present embodiment, the spike structure 1 is configured to be detachable from the spring structure 2.

  Reference numeral 17 denotes a spring storage space inside the member storage cylinder part, and 18 denotes a radial gap between the intermediate support part and the member storage cylinder part. When an insulator is configured using a spring, the surging resonance phenomenon becomes a big problem. This surging is a resonance phenomenon that is determined from the surge speed when the shock wave propagating along the coil wire travels back and forth through the effective part of the spring, and multiple harmonic vibrations with respect to the fundamental frequency are spread over a wide frequency range. Occurs across. The surging preventing member 9 (9a, 9b) used in this example was made of viscoelastic rubber. It is a known damping material that has excellent vibration absorption and internal damping properties against impact, hardly repels even when subjected to external force, and absorbs vibration energy. The viscoelastic piece 9b is kept deformed and always in contact with the inner peripheral surface of the spring coil 11. The height of the surging preventing member 9 is formed smaller than the minimum dimension when the spring coil 11 is compressed by a load such as a speaker.

  In the present embodiment, the spike structure portion 1, the intermediate support portion 10, and the lower base 7 that are vibration transmission paths are made of brass having good characteristics as an acoustic material.

  FIG. 2 is an arrow view of the audio system using the audio insulator according to the first embodiment of the present invention. 31 and 32 are two-channel stereo speakers arranged on the left and right sides, and each speaker body is supported by four insulators mounted on boards 33 and 34. In order to make the arrangement method of each insulator easy to understand, the right speaker 32 is illustrated in a floating state. Reference numerals 35a to 35d and 36a to 36d denote insulators (structures in FIG. 1) disposed at the four corners of the bottom surfaces of the left and right speakers 31 and 32.

Hereinafter, the characteristics of this embodiment insulator will be described.
(1) A vibration isolation effect can be obtained in a wide frequency range.
The reason for the above (1) is that the insulator of this embodiment has the following advantages (i) and (ii).
(I) Advantages of insulators using spikes (ii) Advantages of floating insulators

  The above (i) is a spike type insulator that utilizes the effect that vibration is easily transmitted in the direction of “column → cone → cone apex → saucer → floor surface” and difficult to transmit in the opposite direction. is there. Therefore, the vibration transmitted from the audio device to the floor surface can block the high-frequency vibration transmitted from the floor surface to the audio device again. However, low frequency vibrations cannot be blocked.

The above (ii) utilizes the effect of obtaining a vibration isolating action at or above the resonance frequency range by the frequency characteristics of the secondary vibration system determined by the mass of the load and the spring stiffness. Fig. 3 shows that when the load mass is constant (m = 63.4Kg) and the spring stiffness of the spring coil is three, K _Z = 14.1N / mm, K _Z = 50.6N / mm, K _Z = 120N / mm This is a comparison of vibration isolation characteristics (not considering spike characteristics) in the low frequency region of the spring structure 2. By selecting the spring stiffness so that the vibration cut-off level is 0 dB or less (point A) at the audible lower limit f ₀ = 20 Hz, a low-frequency vibration cut-off action that cannot be obtained by the spike method can be obtained. Although the above-mentioned (ii) alone can provide a blocking effect in a high frequency range, the addition of the above (i) makes it even more effective in a high frequency range (for example, 1000 Hz or more) that greatly affects the acoustic characteristics. The vibration isolation action is obtained. As a result, the influence of vibration due to mutual interference between the audio device and the installation surface can be avoided, and acoustic characteristics such as a sense of depth, resolution, and transparency can be dramatically improved.

(2) Insulator structure with high support rigidity can be used The insulator of the present embodiment can use a highly rigid spring coil. In the graph of FIG. 3, at a frequency higher than the resonance point, the gradient of the vibration cutoff effect with respect to the frequency is -40 dB / dec in any graph. By the way, dec is the interval at which the frequency is 10 times on the horizontal axis of the Bode diagram. The difference in vibration isolation effect due to the difference in spring stiffness does not change even at high frequencies. Therefore, the lower the spring stiffness of the spring coil, the greater the vibration isolation effect can be obtained even in the high frequency range, but the low-rigidity floating insulator has the following problems.

(I) For example, when the four corners of the bottom surface of the audio device are supported by a low-rigidity floating insulator, the audio device is inclined and supported when the center of gravity of the audio device is not the center of the figure. In an analog player, the tolerance of this inclination is extremely small.

(Ii) When a heavy-weight speaker is supported by a floating type insulator, the support stability against impact disturbance such as an earthquake becomes a big issue.

(Iii) In the case of the low-rigidity floating system, it is pointed out that the low-frequency power feeling and localization feeling may be reduced depending on the speaker to be applied, and that the low-frequency sound will not be tightened and will feel unnatural (boomy) floating in space. Has been. Although no report has been found on the theoretical investigation of this phenomenon, the present inventor's research shows that the natural frequency determined by the spring stiffness of the insulator and the load (speaker) becomes too small, and the speaker is generated. It has become clear that this is due to the longitudinal vibration of the body. The insulator of the present embodiment combining the spike method and the high rigidity spring method, for example, supplements the vibration isolation effect of the spike method in a high frequency range of 1000 Hz or more, so the above (i) to (i) A highly rigid spring that can avoid the weak point of iii) can be selected. As a result, an insulator excellent in both the acoustic characteristic improvement effect and the support stability can be configured.

FIG. 4 is a front sectional view showing an audio insulator and a method of supporting an audio device according to Embodiment 2 of the present invention. The structure of this insulator is comprised from the spike structure part 51 and the spring structure part 52 similarly to Embodiment 1, and the spike structure part 51 is installed in the audio equipment side. 53 is a spike fixing portion, 54 is a spike column portion, and 55 is a spike cone portion. The spike structure 51 is constituted by the members 53, 54, and 55. 56 is an audio device (imaginary line), 57 is an upper case, 58 is a lower case (fixed portion), 59 is a protruding portion formed at the center of the lower case 58, and 60 is mounted on the upper portion of the protruding portion 59. A surging prevention member (vibration prevention means). The upper case 57 is disposed above the lower case 58, and a spring coil 61 (elastic member) is provided inside both the members 57 and 58. Reference numerals 62 and 63 denote positioning portions formed on both members for maintaining the state where the shaft cores of both the members 57 and 58 coincide with each other with the spring coil 61 mounted. The surging preventing member 60 is kept deformed and always in contact with the inner peripheral surface of the spring coil 61. Reference numeral 64 denotes a load support portion provided on the upper surface of the upper case 57, and 65 denotes a spike tip receiving portion formed at the center of the load support portion. The spike tip receiving portion 65 has a recess for receiving the spike tip having a conical cross section. In the embodiment, brass is used as the material of the load support portion 64. However, it is preferable to select a material that is not easily deformed by wear due to the load received from the apex of the spike cone portion 55. If the acoustic material is evaluated by the specific acoustic impedance (z = ρc) of various materials, it is preferable that the load support portion 64 is made of a hard material with z> 10 ⁷ Ns / m ³ . Instead of using the above material for the entire load support portion 64, a structure may be adopted in which a hard member is embedded only in the vicinity of the spike tip receiving portion 65 that supports the apex of the spike cone portion 55. Alternatively, the upper end surface of the load support portion 64 may be a flat surface, and the spike tip may be received by a member that elastically deforms the flat surface. In short, as long as the structure can stably support the spike tip without skidding, it is not limited to the shape and material of the upper end surface of the load support portion, and can be applied as a spike tip receiving portion.

  In the case of this example, as in the first embodiment, (1) a vibration isolation effect can be obtained in a wide frequency range, and (2) an insulator structure with high support rigidity can be obtained. Furthermore, it is possible to realize an insulator excellent in both the acoustic characteristic improvement effect and the support stability.

  FIG. 5 is a front cross-sectional view illustrating an audio insulator and a method for supporting an audio device according to Embodiment 3 of the present invention. In the second embodiment described above, a recess for receiving the tip of the spike is formed in the load supporting portion of the insulator to directly support the spike installed on the audio equipment side. The present embodiment shows a method of attaching a disk portion capable of supporting a spike tip to the load support portion and supporting a spike and a spike receiver installed on the audio equipment side.

  101 is a spike structure part, 102 is a spring structure part, 103 is a spike fixing part, 104 is a spike column part, and 105 is a spike cone part. 106 is an audio device (imaginary line), 107 is an upper case, 108 is a lower case (fixed portion), 109 is a protruding portion of the lower case 108, and 110 is a surging prevention member (vibration generation preventing means). 111 is a spring coil (elastic member), 112 and 113 are positioning portions formed on both members, and 114 is a load support portion provided on the upper surface of the upper case 107. Reference numeral 115 denotes a disk portion on which a spike tray that is detachably attached to the load support portion 114 can be mounted. The disk part 115 has a concave cross section, and a spike tray 117 is mounted in the concave part 116. Since the disk part has a concave cross section, the spike tray 117 slides sideways and falls from the disk part 115 even when the entire spring structure 102 is inclined or when the insulator body and the audio device slide relative to each other. Never do. Reference numeral 118 denotes a spike tip receiving portion formed at the center of the spike receiving tray 117. The spike tip receiving portion 118 has a recess for receiving the spike tip having a conical section. Since the spike and the spike tray are often used as a pair of sets, if the inner diameter of the concave portion 116 of the disk portion is sufficiently large, various forms of spike structures can be accommodated. Alternatively, an audio device that does not use a spike structure can be supported. The concave portion of the disk portion only needs to have means (a barrier) that can prevent the spike tray from slipping sideways, and may be, for example, a tooth shape. Alternatively, if a material having a sufficiently large friction coefficient is selected for the disk portion, the disk need not have a concave cross section, and may have a flat top surface.

  Instead of receiving the spike tip by the spike tray, the disk portion may be made of a material corresponding to the spike tray, and the spike tip may be directly supported by the spike tip receiver 119 formed on the upper surface of the disk portion. Also in this case, the disk does not need to have a concave cross section, and may have a flat top surface (different from FIG. 5).

  Also in the case of this example, as in the first and second embodiments, (1) a vibration isolation effect can be obtained in a wide frequency range, (2) an insulator structure with high support rigidity can be obtained, and the above (1) (2) According to the characteristics, it is possible to realize a method for supporting an audio device that is excellent in both the acoustic characteristic improvement effect and the support stability. In both Embodiments 2 and 3, the lower case may wrap around the upper case. Alternatively, even if the upper case is installed on the floor and the lower case is arranged on the audio device side, the function as an insulator is not hindered. In this case, the disk unit 115 according to the third embodiment may be configured to be attached to the end surface of the lower case 108.

FIG. 6 is a front sectional view showing an audio insulator and a method for supporting an audio device according to Embodiment 4 of the present invention. This embodiment has advantages over the above-described embodiments,
(I) Advantages of insulators with spikes (ii) Advantages of floating insulators In addition to (i) and (ii) above,
(Iii) It can have the advantages of an insulator made of a hard material. In other words, it is possible to tune the playback sound using the character of the high-quality acoustic material. The principle will be described below. The structure of the insulator is roughly composed of a spike structure 151 and a spring structure 152, as in the above-described embodiment. Reference numeral 153 denotes an upper support portion (spike-side load support portion), 154 denotes a spike column portion, 155 denotes a spike cone portion, and 156 denotes an upper sleeve (tubular shape member) formed of a thick metal. Spike structure 151 is constituted by members 153 to 156. Reference numeral 157 denotes an audio device (imaginary line), 158 denotes a member storage cylinder, 159 denotes a lower base, 160 denotes a cylinder formed by projecting from the lower base, 161 denotes a surging prevention member (vibration prevention means), 162 Is a disk-shaped intermediate support member (spring-side load support portion), 163 is a spring coil (elastic member), 164 and 165 are positioning portions of the spring coil, 166 is a spike tip receiving portion, and 167 is a bearing portion. In this embodiment, the spike structure 151 is configured to be detachable from the spring structure 152.

A vibration path from the audio device 157 to the upper support portion 153 of the upper sleeve and further to the floor (not shown) is defined as a vibration propagation path Φ _Z. The spring coil 163 having a thick wire diameter serves as a “sound tube” that propagates vibration generated by the audio equipment to the floor surface. Further, when the vibration propagation path Φ _R branched from the vibration propagation path Φ _Z is formed of a cylindrical member, the following remarkable acoustic characteristics that should be called “wind bell effect” can be improved. This wind chime effect is a phenomenon found in the previous proposal (patent pending), but the same effect was also obtained in the examples of the present invention. In this embodiment, the inside of the upper sleeve 156 has a cavity for accommodating the spring structure 152, one end is a sealed structure, and the other end 168 is an open air end, that is, “wind chimes. It is a shape close to. In the embodiment, since the upper sleeve 156 is disposed at a position where the vibration received from the audio device 157 is directly propagated without being attenuated, that is, before the vibration passes through the spike cone portion 155, the wind chimes effect is obtained more effectively. I was able to. The effect of arranging the tubular members is the same in each of the examples (for example, Embodiment 5) described later.

In this example, attention was paid to the refreshing tone of the wind chimes as a new means of utilizing the “effect of the hard material insulator”. By the way, wind chimes are not unique to Japan, and their history is old and exists all over the world. The clear and deep tone and the lingering sound played by the wind chimes resonate well into the distance, and each time the wind blows, it resounds thinly. That is, by combining the vibration propagation path Φ _Z with the wind chime vibration system Φ _R , the effect of a high-quality acoustic material is further enhanced. The vibration system Φ _R uses the end 168 of the upper sleeve 156 as the open end of the vibration propagation path Φ _R , and the vibration propagation is determined as a vibration system determined by the mass of a distributed constant system and a spring arranged in parallel to the vibration propagation path Φ _Z. It affects the path Φ _Z. The following are the results of a trial listening experiment in which the present insulator is mounted on a speaker. However, there is no problem that the natural frequency of the upper sleeve 156 having a large thickness and its harmonic components cause an unnatural sound in the audio playback sound. It was. Higher harmonics and non-consonant components (friction / scratch sounds) generated when playing many instruments do not impair the original sound of the instrument, but conversely add depth and taste to the sound. In the present embodiment, brass having a good characteristic as an acoustic material is used for the upper sleeve 156, but in this case, a deep tone and reverberation are added to the reproduced sound while being transparent, and the sound localization is also performed. The effect of further improving the feeling of feeling, density and scale was obtained. Incidentally, the confirmation of the acoustic effect is a result of a comparative audition experiment with the first embodiment having no cylindrical upper sleeve 156 (wind chimes). Even in the case of the first embodiment, a sufficient effect of improving acoustic characteristics can be obtained, but the present embodiment further exceeds that. For example, sleeve outer diameter φ74mm, sleeve inner diameter φ60mm, sleeve radial thickness 6mm, sleeve height 52mm, material is brass, material is brass, and eigenvalue analysis shows that there are many in the audible range (f <15000Hz) There is a natural vibration mode (results of eigenvalue analysis are not shown). It is considered that these natural vibration modes are synergized to give a deep timbre change to the reproduced sound, and the high-frequency natural vibration mode contributes to the improvement of localization. By the way, the sense of sound field and localization in stereo playback depend on the characteristics of the high frequency range.

Conventionally, what is commercialized as a multi-layered insulator (for example, Patent Document 4) is a material in which various materials having different acoustic impedances are superposed in the longitudinal direction (the direction of the main transmission path Φ _z of longitudinal vibration). It does not have the vibration system Φ _R branched from the vibration propagation path Φ _Z and arranged in parallel as in the embodiment. In this embodiment, brass is used as the material of the upper sleeve. However, if a copper alloy having a higher tin content, for example, “Sagarwood” is used, an insulator having a rich and clear high-pitched sound characteristic is obtained. Become. The reverberation of the sound added to the reproduced sound (space expanse) can be obtained even if the tin content is 1%. Increasing the content to 25% further enhances the effect of wind chimes as “sounding sound”.

However, there is no restriction on the material applied to the upper sleeve if it matches the listener's sound preference, that is, the upper sleeve material is a high-quality acoustic material (inherent in consideration of the affinity of reverberation in the high frequency range). By using the acoustic impedance of 10 ⁷ Ns / m ³ or more, the acoustic characteristics can be effectively improved. Table 1 shows examples of specific acoustic impedance of various materials.

  Turning to the industrial field vibration isolator from the audio field, an example of a vibration absorber conventionally used in this field is disclosed in Japanese Patent Laid-Open No. 2006-200734 (Patent Document 2). In the case of a vibration isolator using a vibration absorber used in this field, it is often sufficient in practice to cut off mechanical vibration transmission in the range of several Hz to 500 Hz. As the material constituting the vibration absorber, resins such as vinyl chloride and polypropylene having weather resistance and impact resistance, thermoplastic elastomers, and the like are used. In industrial vibration isolators, there is no concept of using high-frequency vibrations for sound tuning, and therefore, no consideration is given to the propagation characteristics of acoustic vibrations in the structural and material aspects.

  The outer peripheral envelope of the cylindrical upper sleeve applied to the other embodiments of the present invention may not be a perfect circle but may be a non-axisymmetric polygon. Further, it may be a conical hollow shape instead of a cylindrical shape. In the case of the conical hollow shape, a horizontal component force is generated in the cylindrical member with respect to the longitudinal external force, so that the natural vibration mode is easily excited. Moreover, the structure which has a discontinuous wall surface like a tooth shape instead of a continuous cylinder shape may be sufficient. In the present invention, all of these shapes that can be applied to a cylindrical sleeve are referred to as a generally cylindrical shape.

  FIG. 7 is a front sectional view showing an audio insulator and a method for supporting an audio device according to Embodiment 5 of the present invention.

The structure of this insulator is composed of a spike structure portion 201 and a spring structure portion 202 as in the fourth embodiment, but the spike structure portion 201 is installed on the audio equipment side. Reference numeral 203 denotes a spike support portion, 204 denotes a spike column portion, 205 denotes a spike cone portion, and 206 denotes a spike side sleeve (cylindrical member) formed of a thick metal. Spike structure part 201 is constituted by members 203-206. 207 is an audio device (imaginary line), 208 is a spring housing cylinder, 209 is a lower base, 210 is a cylinder formed by projecting from the lower base, 211 is a surging prevention member (vibration prevention means), 212 Is a disk-shaped spring-side load support portion, 213 is a spring coil (elastic member), 214 and 215 are positioning portions for the spring coil, and 216 is a spike tip receiving portion. The spring-side load support portion 212 is housed so as to be movable in the axial direction with respect to the spring housing tube portion 208 through a narrow gap 217. A vibration path from the audio device 207 to the spike column part 204 of the spike structure part 201 → the spike cone part 205 → the spring side load support part 212 → the spring coil 213 → the floor (not shown) is defined as a vibration propagation path Φ _Z. The point is the same as in the fourth embodiment. The spring coil 203 having a thick wire diameter plays a role as a “sound tube” that propagates vibration generated by the audio equipment to the floor surface. Further, in this embodiment, a vibration propagation path Φ _R (tubular shape member) that brings about the “wind bell effect” branched from the vibration propagation path Φ _Z is formed on the spike structure portion 201 side. That is, in this embodiment, the inside of the spike-side sleeve 206 has a cavity for accommodating the spike column portion 204 and the spike cone portion 205, one end portion is a sealed structure, and the other end portion 218 is the atmosphere release end. It is a shape close to a cylindrical shape, that is, “wind chimes”. In this embodiment, brass having good characteristics as an acoustic material is used for the spike-side sleeve 206, but in this case, a deep tone and reverberation are added to the reproduced sound while being transparent, The point that the effect of further improving the sense of sound localization, density, and scale was obtained was the same as in the fourth embodiment.

  Incidentally, the configuration in which the tubular structure wind bell is provided on the spike structure portion shown in the present embodiment can be widely applied as a spike type insulator as a single component. For example, a normal spike tray may be arranged instead of the spring structure 202 shown in FIG. In this case, although the vibration isolation effect in the low frequency range is lost, an effect in which the above-described wind chime effect is added is obtained as compared with a normal spike type insulator. Alternatively, the spike tray may be disposed on the upper side (audio device side), the spike cone portion may be disposed on the lower side, and the upper portion may be wrapped with a cylindrical wind chime.

  FIG. 8 is a front cross-sectional view illustrating an audio insulator and a method for supporting an audio device according to Embodiment 6 of the present invention. In the case of the present embodiment as well, the spike structure portion and the spring structure portion are formed as in the above-described embodiment, but both members are reversely arranged.

  251 is an upper sleeve (cylindrical member), 252 is a lower sleeve (fixed portion), 253 is a spike column portion, 254 is a spike cone portion, and 255 is a tube formed protruding from the center portion of the spike column portion 253. Reference numeral 256 denotes a surging preventing member (vibration preventing means) mounted on the outer peripheral portion of the cylindrical portion 255. The upper sleeve 251 is disposed above the lower sleeve 252 and the spike column portion 253, and a spring coil 257 (elastic member) is provided so as to be sandwiched between the upper sleeve 251 and the spike column portion 253. Reference numerals 258 and 259 denote positioning portions formed on both members in order to maintain a state where the spike column portion 253 and the upper sleeve 251 are aligned with the spring coil 257 mounted. Reference numeral 260 denotes a spike tip receiving portion, which is formed at the center of the lower sleeve 252. Reference numeral 261 denotes a load support portion for mounting an audio device (not shown) on the upper end surface of the upper sleeve 251. The upper sleeve 251 that brings about the wind chime effect houses the lower sleeve 252 so as to be wrapped from above via a narrow gap 262. Further, the spike column portion 253 is also kept out of contact with the inner surface of the lower sleeve 252 through a narrow gap 263. This embodiment can also have the advantages of each type of insulator in the above-described embodiments, that is, (i) the spike type insulator, (ii) the floating type insulator, and (iii) the insulator made of the hard material.

  FIG. 9 is a front sectional view showing an audio insulator and a method for supporting an audio device according to Embodiment 7 of the present invention. FIG. 10 is a front sectional view showing a state in which a spike installed on the audio equipment side is supported.

  In the case of the present embodiment as well, it is composed of a spike structure portion and a spring structure portion as in the above-described embodiment, but shows a structure that is devised to prevent the two upper and lower sleeves of the spring structure portion from being detached. Reference numeral 301 denotes a spike structure portion (FIG. 10), 302 denotes a spring structure portion, 303 denotes a spike support portion, 304 denotes a spike column portion, 305 denotes a spike cone portion, and members 303 to 305 constitute the spike structure portion 301. Reference numeral 306 denotes an audio device (imaginary line). Reference numeral 307 denotes an upper sleeve which is a cylindrical cylindrical member for obtaining a wind chime effect, 308 denotes a lower sleeve (fixed portion), 309 denotes a cylindrical portion formed by projecting from the central portion of the lower sleeve 308, and 310 denotes a cylindrical portion 309. This is a surging preventing member (vibration preventing means) mounted on the outer periphery of the. The upper sleeve 307 is disposed above the lower sleeve 308, and a spring coil 311 (elastic member) is provided inside the sleeves 307 and 308. Reference numerals 312 and 313 denote positioning portions formed on both sleeves for keeping the axial centers of the sleeves 307 and 308 coincident with the spring coil 311 attached. Reference numeral 314 denotes a spike tip receiving portion, which is formed at the center of the upper sleeve 307. Reference numeral 315 denotes a through hole formed at the center of the upper end of the cylindrical portion 309, and reference numeral 316 denotes a bolt that passes through the through hole and is fastened to the upper sleeve 307. When the spring structure 302 is not loaded (FIG. 9), the head 317 of the bolt 316 having a diameter larger than that of the through hole 315 serves as a stopper to prevent the upper and lower sleeves 307 and 308 from being detached. Further, when the audio device is loaded on the spring structure 302 (FIG. 10), the bolt head 317 is lowered from the position of the through hole 315, so that the function as an insulator is not affected. Reference numeral 318 denotes a load support portion which is an upper end surface of the upper sleeve 307, and 319 denotes a disk portion which can be detachably attached to the load support portion 318. 320 is a recess where a spike tray (not shown) formed on the disk portion 319 can be installed, 321 is a ring portion formed on the lower surface of the disk portion 319, and 322 is a ring storage portion formed on the load support portion 318. A ring portion 321 is attached to the ring storage portion 322. In this embodiment, the disc portion 319 is not used, and the spike structure portion 301 installed on the audio equipment side is supported by using the spike tip receiving portion 314 formed on the upper sleeve 307.

  In this embodiment, a long cylindrical sleeve (upper sleeve 307) provided for obtaining the “wind chime effect” is used to apply an impulsive horizontal disturbance load due to an earthquake or the like to the audio device mounted on the insulator. When added, the tilt of the audio device can be minimized and the fall can be prevented. A case where a disturbance load F is applied to the audio equipment is indicated by an imaginary line in FIG. If the gap in the radial direction between the upper sleeve 307 and the lower sleeve 308 is δ and this gap δ is set sufficiently small, the inclination of the upper sleeve 307 can be suppressed. As a result of evaluation experiments for many speakers, even if there is a change in the specifications (height, installation area, mass, etc.) of the speakers to which this insulator is applied, if the gap δ ≤ 1.0 mm is set, the impact There was almost no hindrance to practical disturbance load. Contrary to the present embodiment, the lower sleeve 308 may be configured to fit the upper sleeve 307.

  Alternatively, the upper sleeve 307 may be disposed on the floor and the lower sleeve 308 may be disposed on the audio device side.

FIG. 11 is a front sectional view showing an audio insulator according to Embodiment 8 of the present invention. In the present embodiment, the installation stability is further improved with respect to the impact disturbance load applied to the audio device more firmly than in the seventh embodiment. Reference numeral 701 denotes an upper sleeve which is a cylindrical cylindrical member for obtaining a wind chime effect, 702 denotes an upper support part (second load support part), 703 denotes a columnar part, 704 denotes a member storage cylinder part, 705 denotes a lower base, 706 Is a cylindrical portion formed by projecting from the lower base, 707 is a surging prevention member (vibration prevention means), 708 is a disk-shaped intermediate support member (first load support portion), and 709 is a spring coil (elastic member) ), 710 and 711 are positioning portions of the spring coil, and 712 is a recess formed in the intermediate support member 708, in which the lower end portion of the cylindrical portion 703 is accommodated. The gap between the inner diameter of the concave portion and the outer diameter (convex portion) of the cylindrical portion may have a sufficient margin. Reference numeral 713 denotes a bearing portion made of a solid lubricant material, which is press-fitted into the upper inner surface on the member storage cylinder portion 704 side, and the cylindrical portion 703 is slidably inserted through a narrow gap 714. Reference numeral 715 denotes a spike tip receiving portion formed at the center of the upper support portion. However, in this embodiment, the foot part having a flat end face on the audio device side may be directly supported by the upper support part 702 without interposing a spike structure. A vibration path from the audio device (not shown) to the upper support portion 702 of the upper sleeve and further to the floor (not shown) is defined as a vibration propagation path Φ _Z. The spring coil 709 having a thick wire diameter plays a role as a “sound tube” that propagates vibration generated by the audio equipment to the floor surface. Furthermore, if the vibration propagation path Φ _R branched from the vibration propagation path Φ _Z is formed of a cylindrical shape member and a high-quality acoustic material is used for the cylindrical shape member, the “wind chime effect” can be obtained as described above. This is the same as the embodiment described above. However, in this embodiment, the acoustic effect is reduced, but the cylindrical member for obtaining the wind chime effect is not essential. For example, as shown in Embodiment 1, the portion that supports the load may have a disk shape (3 in FIG. 1b). The cylindrical portion 703 integrated with the upper sleeve 701 can move in the axial direction, but the movement in the radial direction is restricted by the bearing portion 713. Even when a radial load or moment load is applied to the upper sleeve 701, the cylindrical portion 703 and the intermediate support member 708 move only in the axial direction, so that the spring coil 709 can be expanded and contracted smoothly, and the vibration insulation effect is not lost. . The gap Δ of the bearing portion can be set sufficiently small. For example, even if Δ <0.5 mm, the function as an insulator is sufficient, and if Δ <0.2 mm, the installation stability is greatly improved. Even when a shocking horizontal disturbance load F is applied to the audio device, the inclination of the upper support portion 702 is small, and the audio device can be stably supported. It is more effective if a solid lubricating material is used for the bearing portion. Further, in the above-described embodiment, a structure in which the spike cylindrical portion is slidably stored in the axial direction with a narrow gap in the bearing portion (Embodiment 1, Embodiment 4, structures shown in FIGS. 12 to 14 described later). In this case, the above-described effect (installation stability) can be obtained. For example, as shown in the fourth embodiment, when the cylindrical member 156 (FIG. 4) is provided, the free end 168 of the cylindrical member 156 is obtained even if the gap Δ of the bearing portion 167 is sufficiently small. The wind chimes effect is not impaired.

[Supplemental explanation]
(1) Floating system with built-in spikes As described above, in the embodiments of the present invention, the case where the spring coil is used for all the elastic members used in the floating type insulator has been described. As an elastic member, an air floating method in which air is contained, a magnetic levitation method using a repulsive force of magnetic force, a material using a rubber material, a highly elastic polystyrene foam as a foaming body, a mechanical spring other than a spring coil, etc. can be applied. .

  FIG. 12 is a front sectional view showing an example of the structure, and is roughly composed of a spike structure portion 451 and a floating structure portion 452. Reference numeral 453 denotes an upper support portion (spike-side load support portion), 454 denotes a spike column portion, and 455 denotes a spike cone portion formed by a ball. The upper hemisphere of the ball 455 is press-fitted into the spike cylinder 454. Reference numeral 456 denotes an upper sleeve (cylindrical member). Spike structure part 451 is comprised by members 453-456. 457 is an audio device (imaginary line), 458 is a member storage cylinder portion, 459 is a lower base, 460 is a disk-shaped intermediate support member (floating side load support portion), 461 is a spike tip receiving portion having a semicircular arc cross section, Reference numeral 462 denotes a bearing portion. In this embodiment, the spike structure portion 451 is configured to be detachable from the floating structure portion 452. Reference numeral 463 denotes an element part (imaginary line) of a floating type insulator that corresponds to the elastic member of each of the above-described embodiments and includes air, a magnet, and the like.

Assuming that the vibration path from the audio device 457 → the upper support 453 → the spike column 454 → the spike cone 455 is a vibration propagation path Φ _Z , the vibration propagation path Φ _R branched from the vibration propagation path Φ _Z is a cylindrical shape. It consists of a member (upper sleeve 456). In addition, if a high-quality acoustic material (specific acoustic impedance of 10 ⁷ Ns / m ³ or more) is used for this cylindrically shaped member, the remarkable acoustic characteristics can be improved by the “wind chime effect” as in the above-described embodiment. It is. Although the wind chime effect is slightly reduced, the intermediate support member 460 may be formed of a cylindrical member that wraps around the element portion 463 of the insulator. This configuration can be commonly applied to each embodiment of the present invention. Further, if the spike structure portion 464 (imaginary line) installed on the audio device side is supported using the second spike tip receiving portion 464a formed at the center portion of the upper support portion 453, a double spike support structure is obtained. A further vibration isolation effect can be obtained. In this insulator structure, the gap between the bearing portions 462 can be made sufficiently small, so that the upper support portion 453 can always maintain a horizontal state against the radial external force / moment applied to the upper sleeve 456. Therefore, a sufficiently stable double spike support can be achieved.

(2) When the male side of the spike is provided on the elastic member side In the above embodiment, the male side (convex part) of the spike is provided on the spike structure side (side close to the audio device), and the spike tip receiving part (recessed part) ) Is provided on the elastic member side (side closer to the floor). Although exceptional, the spike arrangement used in audio equipment may be reversed. Hereinafter, the case where the arrangement of the unevenness of the spikes is reversed will be described.

  FIG. 13 is a front sectional view showing an example of the structure, which is roughly composed of a spike structure portion 851 and a floating structure portion 852. 853 is an upper support portion (spike-side load support portion), 854 is a spike column portion, 855 is a spike tip receiving portion (spike recess portion) having a semicircular cross section formed on the lower end surface of this spike column portion, and 856 is It is an upper sleeve (cylindrical shape member). The spike structure portion 851 is configured by the members 853 to 856. 857 is an audio device (imaginary line), 858 is a member storage cylinder part, 859 is a lower base, 860 is a disk-shaped intermediate support member (floating side load support part), 861 is a spike cone part (spike convex part) by a ball , 862 is a bearing portion. The lower hemisphere of the ball 861 is press-fitted into the center portion of the intermediate support member 860. 863 corresponds to the elastic member of each of the above-described embodiments, and is an element portion (imaginary line) of a floating type insulator constituted by air, a magnet, a mechanical spring, etc., and 864 is a second spike tip receiving portion.

(3) Floating method in which spikes are installed on the audio device side FIG. 14 shows a case where the spike structure is installed on the audio device side. Reference numeral 501 denotes a spike structure, and 502 denotes a floating structure. 503 is a spike support portion, 504 is a spike column portion, 505 is a spike cone portion, and members 503 to 504 constitute a spike structure portion 501. 506 is an audio device (imaginary line), 507 is a member storage cylinder part, 508 is a lower base, 509 is a disk-shaped floating side load support part, 510 is a disk part on which a spike tray can be installed, and 511 is a floating side load support part A recess formed in the portion 509. Reference numeral 512 denotes a spike tray receiving portion having a concave cross section formed on the upper portion of the disk portion 510, 513 is a spike tray, and 514 is a spike tip receiving portion. Reference numeral 515 denotes a bearing portion, and 516 denotes an element portion (imaginary line) of a floating type insulator composed of air, a magnet or the like. Incidentally, the spike tray storage portion (for example, the disk 115 in FIG. 5) shown in the above-described embodiment of the present invention can directly receive the bottom portion (for example, a columnar foot) of the audio device instead of installing the spike tray. Alternatively, the audio device may be supported through a hard material insulator of another type.

  The spike tip receiving portion can be commonly applied to each embodiment of the present invention below, but the recess for storing the spike tip is formed of a hard material in a conical section or a semicircular section. Is preferred. For example, a shape in which a bolt is implanted in the upper end surface and the head portion of the bolt can support the tip of the spike may be used. However, in consideration of cost, if some deterioration of acoustic characteristics is sacrificed, for example, a member whose upper surface that receives the spike tip is a flat surface and the flat surface is elastically deformed (rubber, resin, etc.) It may be a structure that receives the spike tip. In short, as long as the spike tip can be stably supported without skidding, the shape and material are not limited and can be applied as a “spike tip receiving portion”.

  In each embodiment of the present invention, the spike structure portion is composed of a spike cone portion, a spike column portion, and a spike side load support portion. The spike composed of a circular cone and a cylinder having a perfect cross section has a standard shape, and the essential function of the spike system is not limited to this shape. For example, both the cone and the cylinder may have a polygonal cross section, and the cone may have a pyramid shape. In the present invention, whatever shape the cross-sectional shape of the member constituting the spike system is, it will be referred to as a conical portion or a cylindrical portion. The cylindrical portion is not essential for the spike system, and the length thereof may be small or may be omitted, and the spike may be formed only by the conical portion. Alternatively, as described above with reference to FIGS. 12 and 13, a spike system may be configured using a ball (455 in FIG. 12). When a ball is used, the spike tip receiving portion does not necessarily need to be provided with a recess, and may be a flat end surface (different from FIG. 12). In this case, if the ball 455 embedded in the spike column portion 454 has a function as a rotatable bearing, the intermediate support member 460 and the spike column portion 454, that is, the spike structure portion 451 and the floating structure portion 452 are mutually connected. No longer restrained in the radial direction.

  As a result, the processing accuracy of each part can be greatly relaxed. The spike system configuration comprising a combination of a ball (or a bearing having a small sliding resistance) that also functions as a bearing and a flat end surface (or a semicircular arc surface having a large curvature) is another embodiment (implementation). It can be applied to Form 1 and Embodiments 4 to 7) (not shown).

(4) Effect of “Acoustic Tube” Now, the “sound tube” described in the above-described example will be described in a little more detail using Embodiment 4 (FIG. 6). The reason why the spring coil is applied as the elastic member constituting the embodiment is that if the spring coil with a thick wire diameter is viewed macroscopically, it can be grasped by a concentrated spring that can easily adjust the rigidity by selecting the outer diameter and the number of turns, and a micro phenomenon. The focus is on the fact that it can function as a sound tube that propagates high-frequency sound waves. If N is the effective number of turns of the spring coil, D is the average coil diameter, d is the coil wire diameter, and G is the transverse elastic modulus, the spring constant K is

  From equation (1), in order to use the spring coil 163 as an acoustic tube, the spring stiffness K is set for the purpose of setting the coil diameter d sufficiently large and obtaining a large vibration blocking action in the low frequency range. It can be seen that the coil outer diameter D and the number of turns N need only be increased in order to reduce. The material of the spring coil 163 used in this example was a hard steel wire (SWC) used as a spring material. As a result of the experiment, it was found that the approximate wire diameter of the spring coil for obtaining the effect as an acoustic tube may be selected in the range of φ3 to φ6 mm.

When the spring coil 163 having a large wire diameter is regarded as an “acoustic tube” having a uniform cross section, high-frequency acoustic vibration generated by the audio device propagates through the spiral acoustic tube as indicated by an arrow 169. Here, the vibration extending to “audio device 157 → upper sleeve 156 → spike cylinder 154 → spike cone 155 → intermediate support member 162 → acoustic tube (spring coil 163) → lower base 159 → floor surface (not shown)” Is the vibration propagation path Φ _z . That is, the high-frequency vibration generated by the audio device is released to the outside through the vibration propagation path Φ _z , so that the reproduction sound can be tuned using the character of the material. In order to effectively obtain this tuning action, the members 156 and 162 are made to have a spring coil 163 (so that the sound wave incident on the upper sleeve 156 from the audio device 157 can be smoothly transmitted into the acoustic tube (spring coil 163). A material (z> 10 ⁷ Ns / m ³ ) having the same specific acoustic impedance as that of steel may be used. In other words, the present embodiment embodies the already proposed basic concept of “blocking vibration at low frequencies and using vibration transmission at high frequencies”. Further, the point that the reproduction sound can be tuned using the character of the material is the same as the effect of the material of the cylindrical member (upper sleeve 156) forming the wind chime. However, even when there is no cylindrical member that forms the wind chime, the playback sound can be tuned by selecting the members 162, 154, and 155.

  For example, in the first embodiment, in order to prevent the surging phenomenon of the spring coil, a plurality of viscoelastic pieces that extend in the radial direction from the cylindrical tube portion are used. In the embodiment, the number of protruding viscoelastic pieces is 8 at 45 ° intervals, but the number is not limited, and may be 8 or less, or 8 or more. Alternatively, instead of using a blade-like viscoelastic piece, a structure in which a columnar viscoelastic member is press-fitted into a spring coil as shown in the second and third embodiments may be used. Further, a structure in which a thin plate-like viscoelastic member is in close contact with the inner surface of the spring coil may be employed. Alternatively, a spring coil material coated with a viscoelastic material may be used. The viscoelastic member is not limited to the above-described member, and may be a material such as a low-rebound rubber having a low resilience but a restoring force to return to the original shape. Or the structure which immersed the spring in the liquid conventionally used as a countermeasure against a surging may be sufficient. For example, in the first embodiment, without using the surging preventing member 9 by the viscoelastic member, instead of containing the lubricating oil in the spring accommodating space 17, it becomes a vibration generation preventing means for suppressing higher-order resonance phenomenon. Moreover, the axial damping effect can be obtained by filling the clearance 16 of the bearing portion 15 or the radial clearance 18 between the intermediate support portion 10 and the member storage cylinder portion 6 with lubricating oil as a viscous fluid. In order to obtain a damping effect by a viscous fluid, a method of sealing silicon oil, which is a viscous fluid, in a narrow gap between a cylindrical surface of a spike and a spike receiver that houses the cylinder is known from Patent Document 1. However, there is no precedent for the concept that this oil also serves as a means for preventing the spring coil from surging. Furthermore, if a magnetic fluid is used for the lubricating oil and a ring-shaped magnet is used as the sealing means, leakage can be prevented without contact. The method described above can be applied to each embodiment of the present invention.

  Spring coils with anti-surging measures are conventionally referred to as non-resonant “surgingless metal springs” that suppress a plurality of high-frequency vibrations with respect to the fundamental frequency. Therefore, if this spring coil is regarded as a lumped constant model in a macro, it is an element that blocks high-frequency vibration. However, in the present invention, the spring coil needs to be regarded as a microscopic phenomenon as a distributed constant model. In the vicinity of the boundary surface between the upper support portion (for example, 162 in FIG. 6) and the spring coil (163 in FIG. 6) that is an acoustic material, an audio device is generated if the specific acoustic impedance of both members is large at the same level. The high frequency acoustic vibration is not completely blocked at the boundary surface, but propagates from the upper support portion to the inside of the spring coil through the boundary surface.

  The vibration generation preventing means for suppressing the higher-order resonance phenomenon in the present invention includes a structure that generates only a single vibration (primary natural frequency) determined only by the mass and the concentrated spring constant. In addition, a floating method that does not generate a higher-order resonance phenomenon, such as an air method or a magnetic method, is also included in the “vibration prevention unit that suppresses the higher-order resonance phenomenon”.

  In the embodiment, a spring coil having a uniform outer diameter in the axial direction is used as the elastic member, but the elastic member applicable to the floating type insulator of the present invention is not limited to this. For example, conical coil springs, disk springs, or a structure in which these disk springs are stacked in multiple stages, bamboo shoot springs, ring springs, spiral springs, thin plate springs, stacked plate springs, U-shaped springs, and other shapes required for audio insulators The size may be selected in consideration of the dimensions. In the present invention, these members are collectively referred to as a mechanical spring.

  Although common to all the embodiments of the present invention, the audio device side (for example, the upper support portion 3 in the first embodiment) of the insulator shown in the embodiment is installed on the floor surface side, and conversely the floor surface side. Even when the (lower base 7) is arranged on the audio equipment side, there is no problem in the function as an insulator. Although the acoustic characteristics change, any one may be selected according to the listener's preference.

  In the embodiments, the case where the insulator of the present invention is applied to a speaker has been described. However, an audio device such as a CD player, an analog player, a preamplifier, a power amplifier, an audio rack equipped with these audio devices, or various musical instruments (for example, , Acoustic instruments), pianos, etc., and similar effects can be obtained. Further, in the embodiment, the case where all the insulators are vertically arranged on the floor surface is shown, but the present invention can be applied even when the posture of the insulator is horizontal, for example, the audio device is horizontally arranged on the wall surface.

6 ... Fixing part (member storage part)
9 ... Vibration prevention means (surging prevention member)
10 ... Load support part (intermediate support member)
11 ... Elastic member (spring coil)
14 ... Spike tip receiving part

Claims (19)

An insulator provided between the bottom surface and the floor surface of the audio device,
An elastic member disposed between a bottom surface and a floor surface of the audio device;
A fixing portion provided between the lower surface portion of the elastic member and the floor surface, and fixed to the lower surface portion of the elastic member;
A load support provided between the top surface of the elastic member and the bottom surface of the audio device;
Vibration preventing means attached to the side surface of the elastic member and suppressing a resonance phenomenon of the elastic member;
A spike cone portion formed in a conical shape, a spike side load support portion that contacts the bottom surface of the audio device and supports the load of the audio device, and a space between the spike side load support portion and the bottom surface of the spike cone portion A spike cylinder portion connecting the spike structure portion, and
A spike tip receiving portion formed on the load support portion, or a disc portion that is attached to the load support portion and can support the spike tip of the spike cone portion directly or by mounting a tray;
A vibration propagation path Φ _R branched from a vibration propagation path Φ _Z extending from the spike side load support part to the inside of the elastic member in the vertical direction , and the vibration propagation path Φ _R has an upper end at the spike side load support part Alternatively , the insulator includes: a substantially cylindrical member fixed to the load supporting portion and having a lower end portion provided apart from the fixing portion .   The insulator according to claim 1, wherein the elastic member is a mechanical spring.   2. The spring rigidity of the elastic member is set so as to obtain a vibration blocking action at 20 Hz or less based on a vibration isolation characteristic determined by a mass of a mounted object and a spring rigidity of the elastic member. Insulator.   3. An insulator according to claim 2, wherein a spring coil is used as the mechanical spring, and the approximate wire diameter of the spring coil is in the range of [phi] 3 to [phi] 6 mm. In the vibration propagation path that proceeds in the vertical direction in the order of the audio equipment, the load support portion, the elastic member, and the floor surface, a portion from the load support portion to the elastic member is a specific value of 10 ⁷ Ns / m ³ or more. 2. The insulator according to claim 1, wherein the insulator is made of a material having acoustic impedance.   2. The insulator according to claim 1, wherein the disk portion has a substantially concave cross section so as to prevent a side slip of a spike tray installed in the disk portion. A cylindrical portion in which a lower end portion is fixed to the fixed portion and the spike column portion is inserted into a vertically extending through hole formed in the upper end portion;
The insulator according to claim 1, wherein the spike cone portion is supported by the spike tip receiving portion, and the cylindrical portion guides the spike column portion so as to be slidable in a vertical direction. The spike structure is provided in advance for the audio device,
The insulator according to claim 1, wherein the spike conical portion is supported by the spike tip receiving portion. The schematic cylindrical shape members insulator according to claim 1, wherein the specific acoustic impedance is constituted by 10 ⁷ Ns / m ³ or more materials. The insulator according to claim 9, wherein the substantially cylindrical shape member is made of a copper alloy. 11. The insulator according to claim 10, wherein the copper alloy has a tin content in the range of 1% to 25%.   A cylindrical portion formed by projecting from the lower central portion of the fixed portion; a through hole provided in the cylindrical portion in the axial direction; a fastening member attached to the load support portion through the through hole; and The audio insulator according to claim 1, wherein an upper limit value of a relative axial distance between the fixed portion and the load support portion is regulated by a fastening member. This is a floating type insulator arranged in series with respect to the spike type insulator, and the spike type insulator is in contact with the conical spike cone part and the bottom surface of the audio device to support the load of the audio device A spike side load support part, and a spike column part connecting between the spike side load support part and the bottom surface of the spike cone part,
The floating insulator is
An elastic member;
A load support portion provided on an upper surface portion of the elastic member and configured to receive a tip of the spike cone portion;
An insulator, comprising: the spike cylinder portion inserted therein; and a guide mechanism that guides the spike cylinder portion so as to be slidable in a vertical direction. This is a floating type insulator arranged in series with respect to the spike type insulator, and the spike type insulator is in contact with the conical spike cone part and the bottom surface of the audio device to support the load of the audio device In a spike type insulator comprising a spike-side load support portion, a vibration propagation branched from a vibration propagation path Φ _Z that proceeds in a vertical direction from the spike-side load support portion that supports the load of an audio device to the spike cone portion has a route [Phi _R, and the vibration propagating route [Phi _R is fixed to the upper end portion and the spike-side load supporting portion, it is formed in schematic cylindrical shape member provided by spacing the lower end portion from the fixed portion And the spike cone or the spike cone on the inside of the substantially cylindrical member. Insulator characterized in that it is constituted by a schematically tubular shaped member for housing. An insulator provided between the bottom surface and the floor surface of the audio device,
An elastic member disposed between a bottom surface and a floor surface of the audio device;
A fixing portion provided between the lower surface portion of the elastic member and the floor surface, and fixed to the lower surface portion of the elastic member;
A first load support portion fixed to the upper surface portion of the elastic member;
Vibration preventing means attached to the side surface of the elastic member and suppressing a resonance phenomenon of the elastic member;
A cylindrical part mounted on the upper surface of the first load support part;
A second load support portion provided on an upper surface portion of the cylindrical portion and supporting a load in contact with a bottom surface of the audio device;
An insulator, comprising: a lower end portion fixed to the fixing portion, and a cylindrical portion into which the columnar portion is inserted into a vertically extending through hole formed in the upper end portion.   8. The double spike support structure according to claim 7, wherein the second spike tip receiving portion formed on the spike side load support portion supports the tip of the spike cone portion installed on the audio equipment side, thereby providing a double spike support structure. Insulator. 8. The invention is characterized in that Δ <0.5 mm is set, where Δ is a gap between the through-hole and the spike cylinder or a gap between the through-hole and the cylinder. 15. The insulator according to 15 . Supporting method of an audio device according insulator according to any of claims 1 to 17. A method for supporting an audio device in which a floating type insulator and a spike type insulator are provided in series between a bottom surface and a floor surface of the audio device,
The floating insulator is
A fixed part placed on the floor;
An elastic member whose lower surface is fixed to the fixing portion;
A load support portion provided on the upper surface portion of the elastic member, on which the spike type insulator is placed, and
The spike type insulator is
A spike-side load support portion that contacts a bottom surface of the audio device and supports a load of the audio device;
A spike cone portion formed in a conical shape extending from the spike side load support portion to the load support portion of the floating type insulator, and
A method for supporting an audio device, comprising: attaching the spike type insulator directly to a bottom surface of the audio device; and providing the floating type insulator only between the spike type insulator and the floor surface.