JP2007142676A - Vibration-preventing support apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-preventing support apparatus capable of effectively isolating vibration from the outside. <P>SOLUTION: The vibration-preventing support apparatus includes a cylindrical spike support; a first spike inserted to the spike support; a second spike placed overlappingly on the first spike; and liquid filled in the spike support. The first spike comprises an upper cylinder part and a lower conical part, only slight gap exists between a sidewall of the spike support and the cylindrical part, the liquid is filled in the gap so as to prevent contacting between both, thereby providing isolation that prevents propagation of vibration. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an anti-vibration support device, and more particularly to an anti-vibration support device that supports precision equipment such as audio equipment and a microscope.

  Audio equipment has a vibration source such as a power transformer inside, or includes a vibration source itself such as a speaker, so vibration energy is generated inside the equipment, and these vibrations greatly affect the playback sound. As a result, the sound quality is deteriorated and the sound image localization is affected. As one of such measures, as shown in Patent Document 1, a support structure in which a conical-structure spike is used in one stage has already been put into practical use, and a certain degree of effect is obtained.

In addition, precision measuring instruments such as microscopes and electronic balances employ a cushioning material such as rubber as a support mechanism for vibration insulation to block external vibration, but it is not sufficient for vibration insulation. This is done by installing it on an expensive vibration control table.
Utility model registration No. 3107462

  The support structure using one stage of the cone-shaped spike described above shows a significant vibration removal effect in the audio field as compared with a cushioning material such as rubber for vibration insulation. However, the sound quality is still poor due to harmonic distortion. There are problems such as being stable and faintly turbid and difficult to install.

  In addition, in a precision measuring instrument such as a microscope or an electronic balance, a vibration control table is expensive, and a support device that can easily take measures against resolution reduction due to minute vibration is required.

  The present invention has been made in view of the above-described problems, and includes a cylindrical spike receiver, a first spike inserted into the spike receiver, and a second mounted on the first spike. The first spike is composed of an upper cylindrical portion and a lower conical portion, and the side wall of the spike receiver has a slight gap in the cylindrical portion. And the gap is insulated so that the liquid enters and prevents contact between the two so that vibration is not transmitted, and the second spike is composed of an upper cylindrical portion and a lower conical portion, The tip of the conical portion is supported on the upper surface of the cylindrical portion of the first spike, at least the conical portion is contained in the spike receiver, the tip of the conical portion is located in the liquid, and the second portion Spike circle Characterized by placing the a mounting 置機 equipment such as precision equipment on the upper surface of the part.

  Further, the present invention is characterized by having a multi-stage spike structure in which one or more spikes are inserted between the first spike and the second spike.

  Furthermore, the present invention is characterized in that each spike is formed of an upper cylindrical portion and a lower conical portion having the same shape.

  Furthermore, in the present invention, each spike and the spike receiver are formed of a copper-based metal material such as brass.

  Further, the present invention is characterized in that the cylindrical portion of the second spike protrudes from the spike receiver to prevent contact between the second spike and the spike receiver.

  In the present invention, the liquid is silicone oil.

  The vibration-preventing support device of the present invention includes a cylindrical spike receiver, a first spike, a second spike placed on the first spike, and a liquid put in the spike receiver. Therefore, in the mounted device placed on the second spike, the vibration from the outside is insulated from the vibration by the spike receiver and the first spike by the liquid, and the first and second spikes are further insulated. Since the transmission of vibration is suppressed by the mechanical diode effect of the spike, it is possible to realize a vibration preventing support device that can effectively insulate vibration from the outside.

  In addition, the vibration prevention support device of the present invention can easily realize a multistage spike structure in which one or more spikes are inserted between the first spike and the second spike, and can realize a vibration prevention support device with higher performance. There is an advantage that vibration isolation between the spike receiver and each spike can be performed with liquid.

  Further, in the vibration preventing support device of the present invention, each spike is formed of the upper cylindrical portion and the lower cone portion having the same shape, so that there is an advantage that each spike can be mass-produced and the cost can be reduced.

  Further, in the vibration preventing support device of the present invention, each spike and spike receiver are formed of a copper-based metal material such as brass, so that there is an advantage that noise due to vibration does not get on each spike.

  Furthermore, in the vibration-preventing support device of the present invention, the setting to the mounted device is facilitated by preventing the contact between the second spike and the spike receiver.

  Furthermore, in the vibration preventing and supporting apparatus of the present invention, the liquid may be left for a long time because it uses silicone oil and does not evaporate or rust.

  FIG. 1 is a cross-sectional view illustrating a vibration preventing support device according to the present invention. FIG. 2 (A) is a spike used in the present invention, and FIG. 2 (B) is a cross-sectional view illustrating a spike receiver used in the present invention. It is.

  The vibration preventing support device having a double spike structure shown in FIG. 1 includes a spike receiver 1, a first spike 10, a second spike 20, and a liquid 30 placed in the spike receiver 1.

  The spike receiver 1 is composed of a cylindrical tube with a bottom, and the inner diameter is just large enough to insert the first spike receiver.

  The first spike 10 is integrally formed with an upper cylindrical portion 11 and a lower conical portion 12, and the cylindrical portion 11 is inserted into the lower end of the spike receiver 1 so as to contact the inner wall of the cylinder of the spike receiver 1. The apex of the conical portion is positioned and fixed in a recess 2 provided in the center of the bottom of the receiver 1.

  Similar to the first spike 10, the second spike 20 is integrally formed of an upper cylindrical portion 21 and a lower conical portion 22, and is a recess provided at the center of the upper surface of the cylindrical portion 11 of the first spike 10. The apex of the conical portion is placed on 13, and the cylindrical portion 21 and a part of the conical portion 22 are placed so as to protrude from the spike receiver 1. As a result, contact between the cylindrical portion 21 and the spike receiver 1 is prevented.

  The liquid 30 placed in the spike receiver 1 is immersed to the tip of at least the conical portion 22 of the first spike 10 and the second spike 20, and is inserted into the gap between the cylindrical portion 11 of the first spike 10 and the inner wall of the spike receiver 1. It is filled to prevent vibrations from being transmitted from the spike receiver 1 to the first spike 10. Accordingly, the first spike 10 is in contact with the bottom of the spike receiver 1 at the apex of the conical portion 12, but in other parts, the liquid 30 covers the first spike 10 and insulates vibration transmission with the spike receiver 1. Has the role of wood. Further, since the liquid 30 is also immersed in the apex of the conical portion 22 of the second spike 20, the first spike 10 and the second spike 20 abut only on the apex of the conical portion 22, and the other portions are liquid. 30 is an insulation for vibration transmission.

  Next, a specific structure of the spike and spike receiver will be described with reference to FIG. FIG. 2A shows a top view and a cross-sectional view of the first and second spikes 10 and 20.

  The spikes 10 and 20 are designed such that the cylindrical portions 11 and 21 have a diameter of 28 mm and a height of 8 mm, and the conical portions 12 and 22 are designed with a bottom surface diameter of 20 mm and a height of 13 mm. The material of the spikes 10 and 20 is formed by grinding a metal material with an NT machine tool. In particular, the material of the spikes 10 and 20 is optimally a copper metal such as brass. This is because the strength that does not cause deformation due to wear of the apexes of the spikes 10 and 20 due to the weight of the supporting precision device and vibration is taken into consideration.

  The apex angles of the conical portions of the spikes 10 and 20 were selected within a range of 50 to 100 degrees, and it was experimentally found that about 72 degrees was optimal for hearing.

  The apexes of the spikes 10 and 20 are slightly rounded and stably supported by a recess 13 provided at the bottom of the spike receiver 1 and the center of the top surface of the spikes 10 and 20. In addition, it is good to provide the small through-hole 14 in the cylindrical part 11 of the spikes 10 and 20, and to vent the air when inserting it into the spike receiver 1.

  In addition, when the spikes 10 and 20 are large, the cylindrical portions 11 and 21 and the conical portions 12 and 22 are separately formed and integrated with the cylindrical portions 11 and 21 using screws protruding from the conical portions 12 and 22. May be.

  FIG. 2B shows a top view and a cross-sectional view of the spike receiver 1. The thickness of the spike receiver 1 is about 2 to 8 mm, and is appropriately selected according to the size of the spikes 10 and 20 and the weight of the precision instrument to be supported. This is because the spike is inserted into the spike receiver 1 with a slight gap (about several μm), so that the thermal expansion coefficient and the like are the same. The material of the spike receiver 1 is preferably the same material as the spikes 10 and 20 described above, and is manufactured by grinding a copper-based metal such as brass using an NT machine tool.

  The spike receiver 1 is designed to have an outer diameter of 40 mm, a height of 39 mm, a bottom surface heat of 5 mm, an inner diameter of 28 mm, and an inner depth of 34 mm. The center of the bottom surface has a depth of 1 mm and a depression angle of 90 mm. Depression 2 is provided.

  The material of the spikes 10 and 20 and the spike receiver 1 is optimally brass. This is because brass is often used as a material for wind instruments, and even if vibration is applied to the brass, it does not cause mischief due to harmonic distortion such as noise.

  The liquid 30 put in the spike receiver 1 is made of low viscosity oil. It is required that the liquid 30 does not evaporate and the spikes 10 and 20 and the spike receiver 1 are not rusted, and silicon oil # 10 is used. Silicon oil enters the gap between the cylindrical portion 11 of the first spike 10 and the spike receiver 1 and insulates vibration transmission between them. Silicon oil fills at least the depression 13 on the upper surface of the first spike 10, and absorbs reflection of vibration from below to improve vibration suppression characteristics.

  The multistage spike structure will be described with reference to FIG.

  FIG. 3 shows a three-stage spike structure in which the spike receiver 1 is extended to insert the third spike 40 between the first spike 10 and the second spike 20. The liquid 30 causes the apex of the conical portion 22 of the second spike 20 to fill. By increasing the number of spikes in this way, vibration transmission from the first spike 10 to the second spike 20 is further reduced, and the vibration transmission insulation characteristics can be improved. The third spike 40 may have the same shape as the first and second spikes 10 and 20. Theoretically, by inserting a large number of spikes between the first spike 10 and the second spike 20, the insulation characteristics of vibration transmission can be improved.

  FIG. 4 is a cross-sectional view seen from a side surface for explaining a mounted device using the vibration preventing support device of the present invention, and FIG. 5 is a top view thereof.

  FIG. 4 shows a speaker 50 applied as a mounted device. The speaker 50 includes a tweeter 51 and a woofer 52, and reproduces sound by driving a diaphragm such as cone paper by an input signal from the main amplifier. Under the speaker, the vibration preventing support device 100 of the double spike structure of the present invention is placed to insulate vibration from the speaker. The vibration preventing support device 100 having a multi-stage spike structure may be used as necessary.

  FIG. 5 shows an arrangement position of the vibration preventing support device 100 according to the present invention. FIG. 5A shows the case of three-point support, where one is arranged on the front surface of the speaker 50 and two are arranged on the rear surface. FIG. 5 (B) shows the case of four-point support, which is often adopted in the lower stage when the mounted equipment is stacked and placed, and the position of the upper stage anti-vibration support device 100 is changed. To prevent vibration transmission.

  Basically, the three-point support shown in FIG. 5 (A) is often used. One vibration prevention support device 100 is arranged near the center of gravity of the mounted device, and the other two vibration prevention support devices 100 are covered. It is placed in a position that stably supports the mounting equipment. In the speaker 50, one vibration prevention support device 100 is placed on the lower center side of the front surface to which the tweeter 51 and the woofer 52 are attached, and the other two vibration prevention support devices 100 are placed at both ends on the rear side. At this time, the vibration preventing support device 100 placed near the center of gravity mainly plays a role of insulating vibration transmission.

  FIG. 6 is a model diagram for explaining the principle of spike vibration transmission used in the present invention.

  The spikes 10 and 20 are composed of cylindrical portions 11 and 21 and conical portions 12 and 22 as shown in FIG.

  Next, as shown in FIG. 6B, the cylindrical portions 11 and 21 can be considered as a spring 61 having a small elastic coefficient, and the conical portions 12 and 22 can be considered as a spring 62 having a large elastic coefficient. The vibrations transmitted from the cylindrical portions 11 and 21 are efficiently transmitted to the conical portions 12 and 22 and can escape from the apexes of the conical portions 12 and 22 to the outside. On the other hand, the vibration transmitted from the outside to the conical portions 12 and 22 is difficult to transmit to the cylindrical portions 11 and 21 due to the difference in the elastic coefficient of the spring.

  This is exactly the same as the characteristics of the diode 63 shown in FIG. 6C. Vibration from the anode side (cylindrical portion) is efficiently transmitted to the outside, and vibration from the cathode side (conical portion) is insulated by a PN junction. It is thought that it is done. For this reason, it is also called a mechanical diode.

  By stacking a plurality of spikes that operate in this manner and by vibrating and isolating the spike receiver 1 and the spikes 10 and 20 with a liquid, it is possible to achieve much more vibration isolation than that of a single spike.

  FIG. 7 shows a schematic diagram of the vibration measuring apparatus. A sine wave signal from a fast Fourier transform device (FFT analyzer) is frequency-divided and applied to the tweeter and woofer of the speaker 50 via a network, and the vibration state of the vibration surface of the tweeter and woofer of the speaker 50 is non-contact laser. Measured with Doppler vibrometer and analyzed with FFT analyzer. The measuring equipment used for vibration measurement is configured as follows.

Figure 8 is a characteristic diagram comparing the difference [Delta] [epsilon] _n of the harmonic distortion components epsilon _n for 1KHz sine wave input signal.

The amount of harmonic distortion when directly placed on the speaker stand is compared with the amount of harmonic distortion in the support method of the single spike structure or the double spike structure of the present invention. When the vibration level for an input signal of f (Hz) is L ₀ and the nth harmonic level is L _n , the ratio of the harmonic distortion to the fundamental wave (input signal) for each support method is expressed as a dB value. The difference is obtained as follows.

ε _n = L ₀ −L _n
In general, if L ₀ = 0 dB,
Δε _n = ε _n (straight)-ε _n (each support method)
Thus, the degree of harmonic distortion can be evaluated. When Δε _n > 0, the harmonic distortion component decreases from direct placement, and when Δε _n <0, the harmonic distortion component increases from direct placement.

  In FIG. 8, the polygonal line shown by the square is the characteristic by the support method of the single spike structure, and the polygonal line shown by x is the characteristic by the support method of the double spike structure of the present invention. It shows that the double spike structure of the present invention is superior up to the fifth harmonic up to 5 kHz.

Figure 9 is a characteristic diagram comparing the difference [Delta] [epsilon] _n of the harmonic distortion components epsilon _n for sinusoidal input signals of 5 KHz. It shows that the double spike structure of the present invention is superior up to the seventh harmonic up to 35 kHz. In particular, the second-order, third-order, fourth-order, sixth-order, and seventh-order harmonic distortions are considerably improved even when compared with the single spike structure.

  Subsequently, the harmonic distortion of the sound emitted from the speaker is measured. FIG. 10 shows a radiation sound measuring device. A sine wave signal from a fast Fourier transform device (FFT analyzer) is amplified by an amplifier, frequency-divided and applied to the tweeter and woofer of the speaker via a network, and collected by a microphone provided in front of the speaker. The signal of the radiated sound is analyzed with an FFT analyzer. The measuring equipment used for radiated sound measurement is configured as follows.

FIG. 11 is a characteristic diagram comparing the difference Δε _n of the harmonic distortion component ε _n of the radiated sound with respect to a 1 KHz sine wave input signal.

  In FIG. 11, the polygonal line shown by the square is the characteristic by the support method of the single spike structure, and the polygonal line shown by x is the characteristic by the support method of the double spike structure of the present invention. This shows that the double spike structure of the present invention is remarkably superior except for the 3rd harmonic of 3 kHz.

FIG. 12 is a characteristic diagram comparing the difference Δε _n of the harmonic distortion component ε _n of the radiated sound with respect to a 5 KHz sine wave input signal. It shows that the double spike structure of the present invention is superior to all harmonics.

FIG. 13 is a characteristic diagram comparing the difference Δε _n of the harmonic distortion component ε _n of the radiated sound with respect to a 10 KHz sine wave input signal. This also shows that the double spike structure of the present invention is superior to all harmonics.

  From these results, it is confirmed that the sound quality at a high frequency is particularly good in the double spike structure or the multistage spike structure of the present invention. These confirm that the vibration isolation by the liquid in the spike holder is perfectly performed.

  FIG. 14 is a characteristic diagram showing a comparison result of sound image localization. A white spike is a single spike structure, and an oblique line is a double spike structure of the present invention. In the present invention, the sound image is sharper and clearer with the violin and the trumpet, and the positional relationship before and after the sound image becomes clear. In addition, other music sources showed significant improvements such as more clearly expressing the positional relationship between the upper and lower instruments. In particular, the space around the musical instrument has been greatly improved, and the clarity of the sound has also been significantly improved.

  Further, the vibration preventing support device of the present invention can be applied to video equipment such as a DVD, and blurring of the contour of the video can be reduced or eliminated.

  Finally, an embodiment applied to an electronic balance will be described.

  FIG. 15 shows the measuring apparatus. A vibration absorbing board 72 is placed on the table 71 directly or via a vibration isolation support device, and an electronic balance 73 is placed thereon. The electronic balance 73 has a height adjusting screw 74 for leveling, and this is in contact with the vibration absorbing board 72. The vibration absorbing board 72 can be directly placed on the table 71, placed through the vibration isolating support device 75 having a single spike structure, or placed through the vibration isolating support device 75 having a double spike structure according to the present invention. Make a comparison.

  One anti-vibration support device 75 is placed under a height adjusting screw 74 having a center of gravity, and the other two are placed at a stable position to support the electronic balance 73. A rubber ball (4.26 g) 76 drops 36 cm in height and gives vibration to the table. The rubber balls 76 are collected only once. Then, the maximum value (maximum deflection width, maximum amplitude of impulse response) of the numerical change of the electronic balance 73 due to the vibration stimulus is measured. The measurement results are as follows.

  FIG. 16 is a characteristic diagram showing the maximum displacement as a graph. The double spike structure vibration preventing support device of the present invention showed the smallest value of −6 μg. This is a significant improvement over direct or conventional single spike structures.

  FIG. 17 is a characteristic diagram in which the variance of the maximum displacement is graphed. The anti-vibration support device of the double spike structure of the present invention shows no variation, and it is clear that the vibration isolation is quite effective.

  The present invention provides an anti-vibration support device for supporting a mounted device such as an audio device, a video device, a precision device, etc., and is a liquid in which external vibration is placed between a spike receiver and a first spike. Audio equipment that is insulated and has low harmonic distortion, video equipment with excellent resolution, or an electronic balance that is resistant to vibration stimulation can be easily realized.

It is sectional drawing which shows the structure of the vibration prevention support apparatus of this invention. It is the top view and sectional drawing which show the (A) spike structure and (B) spike receiving structure which are used for the vibration prevention support apparatus of this invention. It is sectional drawing which shows the multistage spike structure of the vibration preventing support apparatus of this invention. It is sectional drawing which shows the speaker to which the vibration prevention support apparatus of this invention is applied. It is a bottom view which shows arrangement | positioning of the vibration prevention support apparatus of the speaker to which the vibration prevention support apparatus of this invention is applied. 4A is a side view of a spike of the vibration preventing support device of the present invention, FIG. 5B is an equivalent circuit diagram using a spring, and FIG. 5C is an equivalent circuit diagram using a diode. It is the schematic of the vibration measuring apparatus which measures the characteristic of the vibration preventing support apparatus of this invention. It is a characteristic view which shows the measurement result of the vibration prevention support apparatus of this invention. It is a characteristic view which shows the measurement result of the vibration prevention support apparatus of this invention. It is the schematic of the radiation sound measuring apparatus which measures the characteristic of the vibration prevention support apparatus of this invention. It is a characteristic view which shows the measurement result of the vibration prevention support apparatus of this invention. It is a characteristic view which shows the measurement result of the vibration prevention support apparatus of this invention. It is a characteristic view which shows the measurement result of the vibration prevention support apparatus of this invention. It is a characteristic view which shows the comparison result of the sound image localization of the vibration prevention support apparatus of this invention. It is the schematic which applied the vibration prevention support apparatus of this invention to the electronic balance. It is a characteristic view when the vibration preventing support device of the present invention is applied to an electronic balance. It is a characteristic view when the vibration preventing support device of the present invention is applied to an electronic balance.

Claims (6)

A cylindrical spike receiver, a first spike inserted into the spike receiver, a second spike placed over the first spike, and a liquid placed in the spike receiver,
The first spike is composed of an upper cylindrical portion and a lower conical portion, and the side wall of the spike receiver has a slight gap in the cylindrical portion, and the liquid enters the gap between them. Insulated to prevent contact and prevent vibration transmission,
The second spike is composed of an upper cylindrical portion and a lower conical portion, the tip of the conical portion is supported by the upper surface of the cylindrical portion of the first spike, and at least the conical portion is the interior of the spike receiver. And a tip of the conical portion is positioned in the liquid, and a mounted device such as a precision device is placed on the upper surface of the cylindrical portion of the second spike. The vibration preventing support device according to claim 1, further comprising a multi-stage spike structure in which one or more spikes are inserted between the first spike and the second spike. 3. The vibration preventing support device according to claim 1, wherein each spike is formed by an upper cylindrical portion and a lower conical portion having the same shape. 3. The vibration preventing support device according to claim 1, wherein each of the spikes and the spike receiver is made of a copper-based metal material such as brass. 3. The vibration preventing support device according to claim 1, wherein a cylindrical portion of the second spike protrudes from the spike receiver to prevent contact between the second spike and the spike receiver. The vibration preventing support device according to claim 1, wherein the liquid is silicone oil.

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