JP2010014212A - Acoustic equipment and vibration damping material used in acoustic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide acoustic equipment and a vibration damping material used in the acoustic equipment improved in tone quality of reproduced sound. <P>SOLUTION: The acoustic equipment is equipped with components composing the acoustic equipment, and the vibration damping material installed on the components, and the vibration damping material is equipped with first and second plate materials facing each other, and a hollow metal body interposed between the first and second plate materials. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an acoustic device and a vibration damping material used for the acoustic device.

  The related audio amplifier includes a power transformer, a chassis that supports the power transformer, a bottom plate of the housing, and a damping plate that is interposed between the chassis and the bottom plate (see Patent Document 1). This damping plate prevents the vibration of the power transformer from being transmitted to the bottom plate.

Utility Model Registration No. 2513127

  However, since the related audio equipment cannot sufficiently remove vibration, it has not been possible to obtain high-quality reproduced sound.

  An example of the subject of this invention is providing the damping material used for the audio equipment which improves the sound quality of reproduced sound, and an audio equipment.

  In order to solve the above-described problem, an audio device according to the invention described in claim 1 includes a component constituting the audio device and a damping material installed on the component, and the damping material faces each other. And a hollow metal body interposed between the first and second plate members.

  The vibration damping material used for the acoustic device according to the fourth aspect of the present invention is the first and second plate members that are installed on the components constituting the acoustic device and face each other, and the first and second plate members. A hollow metal body interposed therebetween was provided.

  First, the vibration absorbing plate used in the embodiment will be described.

I. Typical structure of vibration absorbing plate A vibration absorbing plate as a damping material is composed of a plurality of flat plates arranged parallel to each other and having a plurality of hollow plates interposed between adjacent flat plates. It consists of a metal body (hereinafter referred to as a hollow metal body).

II Hollow Metal Body The shape of the hollow metal body is not limited to a spherical shape as long as it can be made hollow to reduce the specific gravity, and may be a cube, a rectangular parallelepiped, a cylinder, a prism, or the like.

  For example, the outer diameter of the hollow metal body in a spherical shape is about 1 to 5 mm. The material of the hollow metal body is not particularly limited, but an iron-based metal (for example, iron, carbon steel, stainless steel, etc.) may be used in terms of ease of processing. The material of the hollow metal body and the flat plate may be the same or different.

  The method for producing the hollow metal body is not particularly limited. For example, as described in Japanese Patent Application Laid-Open No. 2007-9278 and Japanese Patent Application Laid-Open No. 2008-24958, metal powder or metal oxide powder is attached to the surface of the spherical resin and heated to decompose and remove the resin. Thereafter, hollow metal spheres are produced by sintering and reduction. A hollow metal body having a shape such as a cube, a rectangular parallelepiped, a cylinder, or a prism is manufactured in an arbitrary shape using the above method. Moreover, after manufacturing a hollow metal sphere, a predetermined shape may be obtained by applying pressure.

III Flat plate The thickness of a flat plate as a plate material is 2 mm or less. This is because if the flat plate is too thick, the vibration absorbing plate becomes heavy. The material of the flat plate is not particularly limited. For example, metals such as iron, carbon steel, stainless steel, and aluminum, ceramics, and resins may be used. The material of the hollow metal body and the flat plate may be the same or different.

IV Embodiment of Vibration Absorbing Plate With reference to FIG. 1, the vibration absorbing plate 10 has a structure in which a plurality of hollow metal bodies 11 a are formed as one layer and the hollow metal bodies 11 are sandwiched between flat plates 12 a and 12 b. That is, the vibration absorbing plate 10 includes a plurality of hollow metal bodies 11a interposed in a layer between a pair of flat plates 12a and 12b arranged so as to face each other in parallel with each other and adjacent flat plates 12a and 12b. And have. The hollow metal body 11a has a shape close to a cylinder.

  Referring to FIG. 2, vibration absorbing plate 10A has, as an example, a structure in which hollow metal bodies 11a, 11b, 11c and flat plates 12a, 12b, 12c, 12d are laminated in multiple layers in the thickness direction of vibration absorbing plate 10A. . That is, the plurality of hollow metal bodies 11a of the first layer are disposed between the adjacent flat plates 12a and 12b. The plurality of hollow metal bodies 11b of the second layer are disposed between the adjacent flat plates 12b and 12c. The hollow metal body 11c of the third layer is disposed between the adjacent flat plates 12c and 12d.

  1 and 2, the hollow metal bodies 11a, 11b, and 11c, and the hollow metal bodies 11a, 11b, and 11c and the flat plates 12a, 12b, 12c, and 12d are fixed to each other with an adhesive 13. The fixing of the hollow metal bodies 11a, 11b, 11c and the flat plates 12a, 12b, 12c, 12d is not limited to the adhesive 13. For example, after hollow metal bodies 11a, 11b, and 11c are sandwiched between flat plates 12a, 12b, 12c, and 12d, metal diffusion bonding may be performed by heating to a predetermined temperature (for example, about 1000 ° C.).

  The vibration absorbing plates 10 and 10A shown in FIGS. 1 and 2 are manufactured as follows, for example.

  In the case of the vibration absorbing plate 10, after obtaining a spherical hollow metal body (for example, an outer diameter of 3 mm), pressure is applied thereto to form a cylindrical shape (for example, a height of 1.6 mm). Next, the cylindrical hollow metal body 11a is spread on a flat plate 12a (for example, a thickness of 0.2 to 0.6 mm). The flat plate 12b is overlaid on the hollow metal body 11a. The hollow metal bodies 11a, the hollow metal body 11a, and the flat plates 12a and 12b are fixed with an adhesive 13 to obtain the vibration absorbing plate 10.

  In the case of the vibration absorbing plate 10A, the hollow metal body 11a of the first layer is disposed on the flat plate 12a, and the flat plate 12b is placed on the hollow metal body 11a. Next, the hollow metal body 11b of the second layer is disposed on the flat plate 12b, and the flat plate 12c is placed on the hollow metal body 11b. Next, the third-layer hollow metal body 11c is disposed on the flat plate 12c, and the flat plate 12d is placed on the hollow metal body 11c. The hollow metal bodies 11a, 11b, and 11c, the hollow metal bodies 11a, 11b, and 11c and the flat plates 12a, 12b, 12c, and 12d are fixed with the adhesive 13 to obtain the vibration absorbing plate 10A.

  It should be noted that the hollow metal bodies 11a, 11b, and 11c that have a flat portion such as a cube, a rectangular parallelepiped, a cylinder, and a prism are used as the hollow metal bodies 11a, 11b, and 11c and the flat plates 12a, 12b, 12c, and 12d. , And the strength of the vibration absorbing plates 10 and 10A is improved. Further, the thicknesses of the flat plates 12a, 12b, 12c, and 12d may be the same or different. Instead of a flat plate, for example, a plate material having an oblique plate surface, a plate material having a curved plate surface, or a plate material having holes formed in the plate surface may be used.

First Embodiment Referring to FIG. 3, an amplifier 20 as an acoustic device includes a chassis 22 supported by legs 21, a power transformer 23 disposed on the chassis 22, a chemical capacitor 24, a radiator 25, And the circuit board 26 and the vibration absorbing plate 10 (see FIG. 1) interposed between the power transformer 23 and the chassis 22. The circuit board 26 amplifies the audio signal from the player and outputs the amplified audio signal to the speaker. Here, the leg 21, the chassis 22, the power transformer 23, the chemical capacitor 24, the radiator 25, and the circuit board 26 correspond to the components of the present invention.

  Next, the operation of the amplifier 20 will be described. The power supply supplies power to the power transformer 23. The power transformer 23 converts the power supply voltage into a predetermined voltage and supplies the predetermined voltage to the chemical capacitor 24 and the circuit board 26. At this time, the power transformer 23 vibrates. The vibration absorbing plate 10 absorbs this vibration, and the vibration is not transmitted to the circuit board 26. Thereby, the circuit board 26 does not have a noise signal due to electrostatic induction or electromagnetic induction caused by the vibration. Therefore, the circuit board 26 amplifies the low-frequency to high-frequency sound signals without being affected by vibration. The amplifier 20 outputs the amplified sound signal to the speaker.

  According to this embodiment, since the vibration absorbing plate 10 removes the vibration of the power transformer 23, the low sound component of the reproduced sound is enriched and the sound of the high sound component is improved, and the sound with improved sound quality is reproduced.

Second Embodiment Referring to FIG. 4, vibration absorbing plate 10 of amplifier 20 </ b> A is interposed between chemical capacitor 24 and chassis 22. According to this embodiment, since the vibration absorbing plate 10 absorbs the vibration of the chemical capacitor 24, the circuit board 26 amplifies the sound signal without being affected by the vibration. Therefore, the present embodiment achieves the same effect as the first embodiment.

Third Embodiment With reference to FIG. 5, the vibration absorbing plate 10 of the amplifier 20 </ b> B is interposed between the radiator 25 and the chassis 22. According to this embodiment, since the vibration absorbing plate 10 absorbs the vibration of the radiator 25, the circuit board 26 amplifies the sound signal without being affected by the vibration. Therefore, the present embodiment achieves the same effect as the first embodiment.

Fourth Embodiment Referring to FIG. 6, vibration absorbing plate 20 </ b> C is interposed between circuit board 26 and chassis 22. According to this embodiment, since the vibration absorbing plate 10 removes the vibration of the chassis 22, the circuit board 26 amplifies the sound signal without being affected by the vibration. Therefore, the present embodiment achieves the same effect as the first embodiment.

Fifth Embodiment With reference to FIG. 7, the vibration absorbing plate 20 </ b> D is interposed between the chassis 22 and the legs 21. According to this embodiment, since the vibration absorbing plate 20D removes vibration from the speaker, the circuit board 26 amplifies the sound signal without being affected by vibration. Therefore, the present embodiment achieves the same effect as the first embodiment.

  Note that this embodiment can be modified within the scope of the gist of the present invention. The audio device may be, for example, a compact disc or digital video disc player, or a speaker. Moreover, you may use the vibration-absorbing board 10 for the insulator arrange | positioned under the audio board for installing an audio equipment, or the leg 21, for example.

Example The relationship between the vibration damping characteristic of the vibration absorbing plate and the sound quality was tested for the example.

  An amplifier 20E according to the embodiment will be described with reference to FIG. The amplifier 20E includes a chassis 22 supported by legs 21, a power transformer 23 and a circuit board 26 disposed on the chassis 22, a radiator 25 disposed on the circuit board 26, a power transformer 23, and the chassis. And a vibration absorbing plate 10 </ b> B interposed therebetween. In the comparative example, a 1.6 mm iron plate was used instead of the vibration absorbing plate 10B.

  The measurement system 30 will be described with reference to FIG. The measurement system 30 includes the amplifier 20E, a speaker 31 that outputs a reproduction sound based on the sound signal of the amplifier 20E, and a microphone 32 that collects the reproduction sound. The measurement system 30 further includes an audio interface 33 electrically connected to the microphone 32 and the amplifier 20E, and a computer 34 electrically connected to the audio interface 33. The audio interface 33 and the computer 34 constitute a control device 35 of the measurement system 30.

  10 and 11 show the sound quality characteristics of the reproduced sound. The vibration absorbing plate 10B of the example used a three-layer hollow metal body.

  The graph shown in FIG. 10 shows the frequency characteristics of the sound pressure of the reproduced sound. The X axis indicates frequency (Hz) and the Y axis indicates sound pressure (dB). The orange line shows the result of the example, and the green line shows the result of the comparative example. As a result, both the example and the comparative example showed almost the same history of sound pressure frequency characteristics.

  The graph shown in FIG. 11 shows the frequency characteristics of the sound pressure and decay time of the reproduced sound. The X axis represents frequency (Hz), the Y axis represents attenuation time (msec), and the Z axis represents sound pressure (dB). The graph shown in FIG. 5A shows the results of the comparative example, and the graph shown in FIG. 4B shows the results of the example. The example showed a long decay time in the bass region B1 of 100 Hz to 200 Hz and the treble region B2 of 400 Hz to 10000 Hz. On the other hand, the comparative example showed a decay time shorter than that of the example in the bass region B1 of 100 Hz to 200 Hz and the treble region B2 of 400 Hz to 10000 Hz. From this result, compared with a comparative example, an Example becomes richer in a low sound component, and the reverberation of a high sound component becomes good, and improves the sound quality of reproduced sound.

  The graph shown in FIG. 12 shows the relationship between the frequency and the magnitude of vibration for the vibration of the chassis 22. The X-axis indicates the vibration frequency (Hz), and the Y-axis indicates the vibration magnitude, that is, the vibration amplitude (m). FIG. 5A shows the result of the reference example. FIG. 5B shows the result of the comparative example, and FIG. 6C shows the result of the example. In the reference example and the comparative example, a 1.6 mm iron plate was used. The vibration absorbing plate 10B of the example uses a two-layer hollow metal body. In the reference example, the amplifier did not output an audio signal to the speaker, and the vibration of the chassis was measured in a state where an excitation current was flowing through the amplifier. In the comparative example and the example, the vibration of the chassis 22 was measured in a state where a 50 W sound signal was output from the amplifier to the speaker at 440 Hz. The vibration of the chassis 22 was measured beside the power transformer 23. As a result, in the reference example, a vibration peak appeared at 50 Hz. In Comparative Examples and Examples, a vibration peak appeared at 100 Hz in addition to 50 Hz. On the other hand, the 50 Hz and 100 Hz peaks of the example were smaller than the peaks of the reference example and the comparative example. That is, the example showed a greater effect on the attenuation of chassis vibration than the reference example and the comparative example.

(A) is the perspective view which fractured | ruptured partially showing typically the vibration absorption board of the single layer structure concerning invention, (B) is a side view of the vibration absorption board. (A) is the perspective view which fractured | ruptured typically showing the vibration absorption board of the multilayered structure concerning this invention, (B) is a side view of the vibration absorption board. 1 is a schematic diagram of an amplifier according to a first embodiment. It is a schematic diagram of the amplifier concerning 2nd Embodiment. It is a schematic diagram of the amplifier concerning 3rd Embodiment. It is a schematic diagram of the amplifier concerning 4th Embodiment. It is a schematic diagram of the amplifier concerning 5th Embodiment. It is a schematic diagram of the amplifier concerning an Example. It is a schematic diagram of a measurement system. It is a graph which shows the frequency characteristic of the sound pressure of reproduction | regeneration sound. It is a graph which shows the frequency characteristic of the sound pressure and reverberation time of reproduction | regeneration sound, (A) shows the result of a comparative example, (B) shows the result of an Example. It is a graph which shows the magnitude | size-frequency characteristic of the vibration of a chassis, (A) is a reference example, (B) is a comparative example, (C) shows the result of an Example.

Explanation of symbols

10 Vibration absorbing plate (damping material)
11a Hollow metal body 12a, 12b Flat plate 20 Amplifier 21 Leg 22 Chassis 23 Power transformer 24 Chemical capacitor 25 Radiator 26 Circuit board

Claims (4)

Parts constituting the audio equipment;
A vibration damping material installed on the component,
The damping material is
First and second plate members facing each other;
An acoustic device comprising a hollow metal body interposed between the first and second plate members.   The audio device according to claim 1, wherein the audio device is one of a player, a speaker, and an amplifier.   The acoustic device according to claim 1, wherein the component is a power transformer. A first plate and a second plate which are installed on components constituting the audio device and face each other;
A vibration damping material used for an acoustic device, comprising a hollow metal body interposed between the first and second plate members.