JP2550373Y2 - Damping device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device applied to an AV device or the like to suppress resonance of a device housing.

[0002]

2. Description of the Related Art There are various types of audio equipment and video equipment. In the case of AV equipment which emphasizes sound quality and image quality, many accessories for improving sound quality or image quality are commercially available. In particular, with regard to image quality, which is difficult for individual differences in visual evaluation, the image quality improvement effect of accessories can be evaluated to some extent quantitatively.However, sound quality depends on hearing, so it is supported by expert knowledge and real sound Experience of listening to and listening to reproduced sound, or personal preference for reproduced sound, etc., greatly affects sound quality evaluation. For this reason, various sound quality improvement measures have been proposed so far, including various methods that are not as sure as true or false, but it is expected that there is no difference in tone between models, like a CD player. Just as some devices continue to work harder to improve, there is no end point in circuit design and housing design. On the other hand, even for compact discs to be played on CD players, the edges are painted with green paint, or the reflective layer is changed from aluminum evaporation to gold evaporation, making the sound glossy and mellow, It has been reported that the feeling is much improved.Recently, compact discs using amorphous polyolefin-based resin or norbornene-based resin with less diffuse reflection of reflected light than polycarbonate resin are better than discs that record the same contents. But it seems that there is a difference in sound quality. The reason is that, in the case of a compact disc, suppressing irregular reflection of reflected light leads to an improvement in sound quality. This fact is not limited to not only the material of the disc but also the resonance of the player housing which causes irregular reflection of reflected light. It speaks eloquently that necessary measures must be taken.

In general, not only audio equipment and video equipment but also many cases in which sound quality or image quality is improved by suppressing unnecessary vibrations have been reported. For example, in the audio amplifier 1 shown in FIG. Lead plate 2
The vibration damping method that suppresses the resonance of the housing by mounting several of them is adopted. By suppressing the vibration of the circuit components inside the housing 1a, for example, the fluctuation of the stray capacitance between the circuit elements is reduced. Has been said to be effective in improving sound quality. In addition, this type of vibration damping method has the merit that anyone can easily practice it only with a simple method such as placing a metal lump that is no longer needed in the home on the housing 1a of the audio amplifier 1. However, it could not be denied that there was a limit to the damping effect. In general, if the recording medium and input signal quality are the same, it is naturally preferable that the AV device is not affected by external vibrations, that is, it is preferable that the AV device be stable with a feeling of weight. It is important to utilize the mechanical grounding concept compared to the electrical single-point grounding concept in the housing design, even if it is not as lean as the analog player that reproduces information as a vibration. From this point of view, recently, the vibration mode of the housing itself has been examined by simulation, and techniques for optimal weight distribution and strength imparting have been actively adopted, and a honeycomb structure has been adopted for the housing itself, or Insulators with a vibration damping function to block external vibrations have been adopted as supporting insulators.

[0004]

However, most of the conventional resonance countermeasures are limited to improvement examples on the AV device side, and the function of improving the performance of a given AV device is further improved. It was not what I wanted. Therefore, as an improvement measure similar to the above-described lead plate, for example, as shown in FIG. 7, an AV device 3 such as an audio amplifier is mounted on a rigid and heavy tuning board 4 and another AV device is mounted. A vibration damping method has been proposed in which vibration transmitted from the device through the floor surface is forcibly cut off, and the tuning board 4 has actually come on the market as a commercial product. But,
This type of conventional tuning board 4 has a primary purpose of blocking unnecessary vibrations transmitted from the outside to the AV device 3 mounted thereon, and suppresses vibration generated by the AV device 3 itself. AV equipment 3
However, there is a problem in that the vibration damping effect can be expected only within the range of the mechanical structure determined in the equipment design stage, and no further effect can be expected. Furthermore, in recent years, measures against electromagnetic interference which may affect sound quality and image quality have been emphasized.
Even if it could be a breakwater against electromagnetic waves from under the floor, there was a problem that there was no way to deal with electromagnetic waves falling directly above the AV equipment 3.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and comprises a pair of plate members for holding a device to be damped from above and below, and a state in which the pair of plate members are held between the devices. A first feature is to have a fastening means for fastening to each other.

Further, according to the invention, the pair of plate members each have a size including at least a part of the plane projection shape of the device, and are fastened to each other to suppress a housing resonance of the device. The base plate, and the fastening means,
A second insertion bolt that penetrates the pair of plate members from top to bottom while the device is sandwiched from above and below, and a leg that is screwed to a lower end of the insertion bolt and directly grounds,
This is a third feature.

[0007]

According to the present invention, the resonance of the housing of an AV device or the like is suppressed by sandwiching the device to be damped from above and below with a pair of plate members and fastening the pair of plate members to each other while holding the device. Improve sound quality or image quality.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view showing a state in which an embodiment of the vibration damping device according to the present invention is applied to an audio amplifier, and FIG. 2 is a partially cutaway sectional view of FIG.

The AV equipment shown in FIG. 1 is an audio amplifier 11 such as a pre-main amplifier, for example, in which a power supply circuit, a preamplifier circuit, a main amplifier circuit and the like are incorporated in a relatively flat cubic housing 11a. I have. The vibration damping device 12
A pair of plate members 13 and 14 for holding the device to be damped from above and below
And a fastening means 15 for fastening the pair of plate members 13 and 14 to each other while sandwiching the device to be damped. The pair of plate members 13 and 14 are the housing 1 of the audio amplifier 11.
In the four corners of the two metal plates larger than the plane area of 1a, insertion holes 13 for insertion bolts 16 as shown in FIG.
a and 14a are bored and used as a top plate and a ground plate for vibration suppression. A metal plate having high weight and rigidity is used to suppress the housing resonance of the audio amplifier 11. Specifically, as the plate members 13 and 14, an iron plate, a lead plate, an aluminum plate, or a copper-plated iron plate resistant to electromagnetic wave interference is used.

The fastening means 15 includes an insertion bolt for inserting the pair of plate members 13 and 14 from above to below while holding the audio amplifier 11 from above and below, and a leg 17 which is screwed to a lower end of the insertion bolt 16 and directly grounds. It is composed of The insertion bolt 16 has a length exceeding the height of the audio amplifier 11, and a male screw is formed only within a predetermined length range from the tip. On the other hand, the leg 17 has a cone shape with a conical tip, and is made of a durable metal, hard plastic material, ceramic, or the like so that a heavy object can be supported with a slight contact area close to a point. It is configured.

To mount the vibration damping device 12 on the audio amplifier 11, first, a pair of plate members 13 and 14 are overlapped so that the top plate is placed on the base plate, and the plate members 13 and 14 are inserted into the through holes 13 a and 14 a at four corners. The insertion bolt 16 is inserted.
Next, the leg 17 is screwed into the tip of the insertion bolt 16. In this state, the two plate members 13 and 14 are overlapped and locked on the upper end surfaces of the four legs 17 and the four insertion bolts 16 are attached to the plate member 1.
Become independent by being supported by 3,14. Therefore, the plate member 13 serving as the top plate is separated upward from the plate member 14 serving as the ground plate, and the audio amplifier 11 to be damped is placed in a space between the two plate members 13 and 14. As a result, the audio amplifier 11 moves the housing 11a from the top and bottom to the two plate members 13,
14, but at this time, the insertion bolt 16
The screwing between the arm and the leg 17 is not yet complete, leaving room for fastening. Then, using a tool such as a wrench (not shown) that engages with the head of the insertion bolt 16, the insertion bolt 16 is turned in the direction in which the screw is tightened. And four insertion bolts 16
Is completely tightened, the audio amplifier 11 is firmly tightened from both sides by a pair of upper and lower plate members 13 and 14 sandwiched between the upper end surface of the leg 17 and the lower surface of the head of the insertion bolt 16. State.

As a result, the housing 1 of the audio amplifier 11
1a has substantially the same effect as increased strength and rigidity by the two plates 13 and 14, whereby the resonance of the audio amplifier 11 is suppressed.
The disadvantage that the stray capacitance between the circuit elements changes along with the vibration and adversely affects the circuit operation can be satisfactorily eliminated. Also, the audio amplifier 11
Is supported on a plate material 14 serving as a solid base,
Moreover, since the plate 14 itself is grounded at four points, unnecessary vibration transmitted from the floor is cut off by the plate 14, so that
And the plate member 14 exhibit an anti-vibration function of blocking external vibration. Furthermore, by forming the plate members 13 and 14 from a magnetically shielded metal material such as a copper-plated iron plate, electromagnetic waves radiated by other AV devices are reliably blocked by the plate members 13 and 14 and sound quality deterioration due to electromagnetic wave interference is satisfactorily eliminated. can do.

In the above embodiment, the plate 13 serving as a top plate is made of a solid metal plate having no ventilation holes in consideration of the adhesion to the audio amplifier 11. For example, as in the case of the vibration damping device 22 shown in FIG. 3, at least one of the plate members 23, 24 which will be the top plate may be provided with several vent holes 23 a.

In the above embodiment, the insertion bolt 1
Instead of 6, it is also possible to use a screw rod (not shown) in which screws are screwed at both ends of the rod-shaped member and a nut (not shown) screwed to this screw rod. In this case, the audio amplifier 11 is placed on the plate member 14 in a state where the plate member 14 serving as the ground plate is assembled to the screw rod, and the plate member 1 serving as the top plate is placed on the audio amplifier 11.
3 and, finally, the nut can be tightened, so that the operation of assembling the vibration damping device is relatively simplified.

Furthermore, in the above-described embodiment, it is necessary to prepare a plurality of types of the insertion bolts 16 in accordance with the device to be damped. However, as in the case of the damping device 32 shown in FIGS. The insertion bolt 3 is divided into two parts by a sleeve 33 having an inner thread cut into two parts.
4, 35 may be connected. In this embodiment, two insertion bolts 3 screwed into the sleeve 33 are used.
Since the screw directions of the 4 and 35 male screws are reversed with respect to each other like a left screw and a right screw, by rotating the sleeve 33 forward or reverse, both the insertion bolts 34 and 35 are separated or brought close to each other. Can be. Therefore, by adjusting the screwing length of the insertion bolts 34 and 35 with respect to the sleeve 33, it is possible to freely cope with AV devices having different heights. A plurality of insertion bolts 16 having different lengths according to
You are freed from the trouble of having to prepare In addition,
In this embodiment, the leg 17 at the lower end of the insertion bolt 35 can be fixed to the insertion bolt 35.

In the above embodiment, the AV device
Not only the audio amplifier 11 but also other audio devices or video devices may be used, and the devices to be damped are not limited to such AV devices, but may be personal computers, their peripheral devices, office machines such as facsimile machines, All devices to be damped, such as industrial measuring instruments and controllers, fall under this category.

[0017]

As described above, the present invention comprises a pair of plate members for holding a device to be damped from above and below, and a fastening means for mutually fastening the pair of plate members while holding the device therebetween. The device to be damped is sandwiched between a pair of plates from above and below, and the plates are fastened together by fastening means, so that the plate is integrated with the device to be damped as an additional top plate and ground plate This suppresses the housing resonance of the device to be damped, and especially when applied to a device such as an AV device in which the housing resonance adversely affects the sound quality and image quality, a remarkable sound quality improvement effect or image quality improvement effect is obtained. It has excellent effects such as a metal rod placed on the equipment housing to dampen vibrations, and mounting equipment on a board that blocks vibrations transmitted through the floor, which can be expected to have a sufficient improvement effect that can not be obtained by conventional methods. Playing That.

[0018] In addition, the present invention is characterized in that the pair of plate members each have a size including at least a part of the planar projection shape of the device and are fastened to each other to suppress a housing resonance of the device. Because it is composed of the ground plate, it is particularly effective for damping equipment with a cubic-shaped housing.By bringing a pair of plate materials into close contact with the upper and lower surfaces of the housing, the resonance of the housing is suppressed well, and the plate material is reduced. The use of a material that does not allow electromagnetic waves to pass easily makes it possible to eliminate electromagnetic interference as well as damping, and in particular, when applied to AV equipment, it is possible to significantly improve sound quality or image quality.

Still further, according to the present invention, the fastening means includes an insertion bolt for inserting the pair of plate members from top to bottom while the device is sandwiched from above and below, and is directly screwed to a lower end of the insertion bolt. By having the grounding leg and the insertion bolt having the length corresponding to the height of the equipment,
Using a leg that plays the role of a nut by screwing to this insertion bolt, a pair of plate members can be securely fastened, and the leg corresponding to the nut is directly grounded to support the entire device and plate members, The vibration transmitted through the floor is transmitted through the legs having a limited ground contact area, and has an effect such that external vibration due to the plate material serving as the main plate can be satisfactorily cut off.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which an embodiment of the vibration damping device of the present invention is applied to an audio amplifier.

FIG. 2 is a partial cross-sectional view of FIG.

FIG. 3 is a perspective view showing a modification of the vibration damping device shown in FIG.

FIG. 4 is a front view showing a state in which another embodiment of the vibration damping device of the present invention is applied to an audio amplifier.

FIG. 5 is a partial sectional view of FIG. 4;

FIG. 6 is a perspective view illustrating an example of a conventional AV device vibration damping method.

FIG. 7 is a perspective view for explaining another example of the conventional AV device vibration damping method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Audio amplifier 12, 22, 32 Vibration suppression device 13, 14, 23, 24 Plate material 15 Fastening means 16, 34, 35 Insertion bolt 17 Leg

Claims (3)

(57) [Scope of request for utility model registration] 1. A vibration damping device comprising: a pair of plate members for holding a device to be damped from above and below; and fastening means for mutually fastening the pair of plate members while holding the device therebetween. apparatus. 2. The pair of plate members each have a size that at least partially includes a planar projection shape of the device,
2. The vibration damping device according to claim 1, wherein the top plate and the ground plate are fastened to each other to suppress a housing resonance of the device. 3. The fastening means comprises: an insertion bolt for inserting the pair of plate members from above to below while holding the device from above and below; and a leg screwed to a lower end of the insertion bolt and directly grounded. The vibration damping device according to claim 1, wherein: