close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JP2012114671

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2012114671
An object of the present invention is to provide a vibration transmission device and a vibration
transmission method capable of applying an appropriate pressure to an actuator without being
influenced by the strength of a portion to be vibrated and performing effective vibration
transmission. An actuator unit (13) is joined with an actuator unit (13) that generates vibration
based on an input signal and a vibration passive unit (11) that receives the vibration from the
actuator unit (13) by a coupling unit (12) By integrating the vibration passive portion 11 and the
coupling portion 12 and attaching the vibration passive portion 11 to the portion to be vibrated
7, the pressure of the actuator portion 13 is increased to adjust the transmission of vibration to
the portion 7 to be vibrated. An appropriate pressure can be applied to the actuator unit 13
without being affected. [Selected figure] Figure 1
Vibration transmission device and vibration transmission method
[0001]
The present invention relates to an acoustic system, a magnetostrictive actuator used as a sound
source of a speaker such as a video apparatus, a vibration transmission device for transmitting
vibration of a laminated piezoelectric actuator or the like to each portion to be vibrated, and a
vibration transmission method.
[0002]
In recent years, a speaker has been proposed that uses as a sound source an actuator that uses a
magnetostrictive element different from a so-called dynamic speaker based on Fleming's lefthand rule using magnets and coils, a laminated piezoelectric element, etc. For example, audio
systems and video apparatuses different from video apparatuses, such as Patent Documents 1
14-04-2019
1
and 2, have been commercially available.
[0003]
Conventionally, vibration transmission from this type of actuator to the diaphragm of the speaker
is performed by attaching the actuator directly to the surface of the diaphragm as shown in, for
example, Patent Document 3.
That is, as shown in FIG. 5, a pair of L-shaped angles 9-1 and 9-2 serving as displacement
transfer members are disposed to face each other, and the opposing surfaces of these L-shaped
angles 9-1 and 9-2 are disposed. In a state in which the actuator 100 is held, the actuator 100 is
attached to the surface of the diaphragm 7 by attachment screws 8-1 and 8-2.
[0004]
The adjustment of the vibration transmission characteristic from the actuator 100 to the
diaphragm 7 which is the sound producing portion is performed by tightening or loosening the
vibration transmission adjusting screw 10 inserted through the L-shaped angle 9-2 of the rear
portion of the actuator 100. By changing the pressure applied in the longitudinal direction of.
[0005]
JP, 2007-166027, A JP, 2010-93769, A JP, 2006-238575, A
[0006]
By the way, the diaphragm 7 to which the actuator 100 is attached is a polymer material such as
paper, polypropylene resin, acrylic resin or the like conventionally used for a speaker, a metal
material such as aluminum or magnesium, or a composite of a polymer material and metal It is
formed of a material or the like.
The thickness is preferably as thin as about 1 mm for effective sound generation.
[0007]
14-04-2019
2
However, when the actuator 100 is attached to such a thin diaphragm 7 by the L-shaped angles
9-1 and 9-2, when the pressure is applied to the actuator 100 from the vibration transmission
adjusting screw 10, the attachment portions 18-1 and 18 are attached. As shown in FIG. 6, the
diaphragm 7 is warped and the upper ends of the L-shaped angles 9-1 and 9-2 open.
As a result, the distance ΔA between the opposing surfaces of the L-shaped angles 9-1 and 9-2
becomes large, so that the actuator 100 can not apply the appropriate pressure necessary for
optimal vibration transmission, and sufficient vibration transmission characteristics are obtained.
There was a problem that it could not be obtained.
[0008]
On the other hand, if the diaphragm 7 is thickened to increase the strength structurally, or if a
high strength material is used, the warp of the diaphragm 7 can be suppressed to give an
appropriate pressure to the actuator 100, thereby effectively transmitting vibration. Although the
vibration plate 7 has high strength, the vibration amplitude is small with respect to the energy of
the input signal, in other words, a new problem occurs such that the transmission energy
efficiency becomes worse and the reproduction sound pressure becomes lower. Do.
[0009]
The present invention has been proposed in view of the above, and an object thereof is to be able
to apply an appropriate pressure to the actuator without being affected by the strength of the
portion to be vibrated, and to effectively transmit vibration. It is an object of the present
invention to provide a vibration transmission device and a vibration transmission method that
can be performed.
[0010]
In order to solve the above-mentioned subject, in the vibration transmission device of the present
invention concerning Claim 1, an end side is pressurized and an actuator part which expresses
vibration based on an input signal, and a vibrator end of the other end side in the actuator part A
vibration passive part that receives vibration from the vibration part and transmits the vibration
to the vibrated part, and a coupling part provided on an outer peripheral part of the vibrator end
between the actuator part and the vibration passive part, and formed of an expandable member
Preferably, the actuator unit, the vibration passive unit, and the coupling unit are integrated.
14-04-2019
3
[0011]
According to a second aspect of the present invention, in the vibration transmission device
according to the first aspect, the telescopic member of the coupling portion is opposite to an
attachment portion of the actuator portion and the vibration passive portion to the portion to be
vibrated. At least a part of the part is joined.
[0012]
Furthermore, according to a third aspect of the present invention, in the vibration transmission
device according to the first or second aspect, the stretchable member includes an elastic body
material, a metal spring, or a metal plate having a stretchable function. Do.
[0013]
Furthermore, according to a fourth aspect of the present invention, in the vibration transmission
device according to the first aspect, the actuator portion includes an actuator using a
magnetostrictive element or an actuator using a piezoelectric element.
[0014]
In order to solve the above-mentioned subject, in the vibration transmission method of the
present invention concerning Claim 5, while pressurizing the end of an actuator and making the
vibrator end which made it project from the other end of the actuator contact a vibration passive
part, An elastic member is interposed on an outer peripheral portion of a vibrator end to bond
the vibration passive unit and the elastic member, and vibration of the vibrator end based on an
input signal to the actuator is transmitted to the vibration passive unit. It features.
[0015]
According to a sixth aspect of the present invention, in the vibration transmitting method
according to the fifth aspect, the actuator, the telescopic member, and the vibration passive
portion are integrated and attached to a vibration target portion and transmitted to the vibration
passive portion. The vibration of the vibrator end is transmitted to the portion to be vibrated.
[0016]
In the first aspect of the present invention, when the actuator portion is pressurized, the coupling
portion formed by the expansion and contraction member disposed on the outer peripheral
portion of the vibrator end receives pressure uniformly, and the actuator portion, the vibration
14-04-2019
4
passive portion and the coupling Since the parts are integrated, the attachment part to the
portion to be vibrated does not open as in the prior art, and the upper end of the L-shaped angle
is not opened and the pressure is not insufficient.
Therefore, it is possible to apply an appropriate pressure necessary for optimal vibration
transmission to the actuator unit without being affected by the strength of the portion to be
vibrated, and to perform effective vibration transmission.
[0017]
Further, by joining at least a part of the portion opposite to the attachment portion to the portion
to be vibrated as described in claim 2, it is possible to apply an appropriate pressure to the
actuator portion.
[0018]
Furthermore, as described in claim 3, as the stretchable member, an elastic body material, a
metal spring, or a metal plate having a stretchable function can be used.
[0019]
Furthermore, as described in claim 4, an actuator using a magnetostrictive element or an
actuator using a piezoelectric element can be applied to the actuator portion.
[0020]
In the fifth aspect of the present invention, since the expandable member disposed on the outer
peripheral portion of the vibrator end receives pressure uniformly, it is possible to apply an
appropriate pressure necessary for optimal vibration transmission to the actuator.
[0021]
According to the sixth aspect of the present invention, by integrally attaching the actuator, the
telescopic member, and the vibration passive portion to the portion to be vibrated, the
attachment portion to the portion to be vibrated becomes a fulcrum as in the prior art. The upper
end of the V-shaped angle does not open and there is no pressure shortage.
14-04-2019
5
Therefore, it is possible to apply an appropriate pressure necessary for optimal vibration
transmission to the actuator without being affected by the strength of the portion to be vibrated,
and to perform effective vibration transmission.
[0022]
FIG. 1A is a front view of a vibration transmission device, and FIG. 1B is a view taken along line
1B-1B of FIG. 1A, for explaining a vibration transmission device and a vibration transmission
method according to an embodiment of the present invention. FIG. 1C is a top cross-sectional
view taken along the line 1C-1C of FIG.
The schematic structure of the magnetostrictive actuator used by the vibration transmission
apparatus based on 1st Example of this invention is shown, (a) figure is a front view, (b) figure
was along 2B-2B line of (a) figure. It is a side sectional view.
It is a characteristic view which compares and shows the reproduction sound pressure-frequency
characteristic of the vibration transfer device concerning conventional and the 1st example of the
present invention.
FIG. 6 is a side cross-sectional view of a vibration transfer device using a laminated piezoelectric
element, showing a vibration transfer device according to a second embodiment of the present
invention.
It is for demonstrating the conventional vibration transmission apparatus and vibration
transmission method, and is a side sectional view which shows the example of attachment of an
actuator.
It is a side sectional view showing an opening phenomenon of an L-shaped angle which occurs
when the actuator is pressurized by a vibration transmission adjustment screw, for explaining the
conventional vibration transmission device and vibration transmission method.
[0023]
Hereinafter, embodiments of the present invention will be described based on the drawings.
14-04-2019
6
[0024]
Basically, as shown in FIGS. 1A to 1C, the vibration transmission device of the present invention
includes an actuator 100 that generates vibration based on an input signal, and a vibration
passive unit 11 that receives vibration from the actuator 100. , And a joint 12 joining them
together.
The mounting portions 15-1 to 15-6 of the integrated vibration transmission device are fixed to
the diaphragm 7, which is a portion to be vibrated, by, for example, mounting screws 16-1 to 166.
Then, in order to accurately transmit the vibration of the actuator 100 to the diaphragm 7, the
actuator 100 is pressurized by the vibration transmission adjusting screw 10.
At this time, the pressure from the vibration transmission adjusting screw 10 is equally dispersed
in a wide area and received by the joint portion 12 joining the actuator 100 and the vibration
passive portion 11.
[0025]
Next, a specific example in which rubber is used as the expansion and contraction member 12 a
in the coupling portion 12 will be described.
As shown in FIGS. 1B and 1C, an O-shaped rubber 12a is disposed around the drive rod 1
(vibrator end 1a) of the actuator 100, and the actuator is interposed with the O-shaped rubber
12a. The structure is such that the portion 13 and the vibration passive portion 11 are joined.
Thus, the pressure applied from the vibration transmission adjusting screw 10 in the longitudinal
direction of the actuator 100 is equally applied to the vibration passive portion 11.
14-04-2019
7
That is, since the contact area of the coupling part 12 with the vibration passive part 11 is
sufficiently larger than the contact area of the vibrator end 1 a with the vibration passive part 11,
the pressurization to the vibration passive part 11 becomes even. .
[0026]
As a result, the phenomenon that the upper ends of the L-shaped angles 9-1 and 9-2 open as
shown in FIG. 6 due to the deformation of the diaphragm 7, which is the conventional problem,
can be eliminated, and the strength of the diaphragm 7 is affected. The vibration of the actuator
100 can be effectively transmitted to the diaphragm 7 and sound generation with high
transmission energy efficiency can be achieved.
[0027]
In the above description, the structure in which the entire circumference of the vibrator end 1a is
joined by the O-shaped rubber 12a is taken as an example, but, for example, the attachment
portions 15-1 to 15-6 to the diaphragm 7 of the vibration transmission device And a C-shaped
rubber in which a part of the O-shaped rubber 12a is cut out may be used.
The shape of the bonding material is not limited as long as it is an elastic material such as rubber,
a material such as a metal spring or a thin metal plate, and has a stretching function.
[0028]
As described above, in the vibration transfer device according to the present embodiment, when
the actuator 100 is pressurized by the vibration transfer adjustment screw 10, the pressure at
the connecting portion 12 composed of the expandable members 12a arranged around the
vibrator end 1a is uniform pressure Since the attachment portions 15-1 to 15-6 to the diaphragm
7 serve as fulcrums, the upper end of the L-shaped angle is not opened as in the prior art, and
the pressure is not insufficient.
Therefore, an appropriate pressure necessary for optimal vibration transmission can be applied
to the actuator 100 without being influenced by the strength of the diaphragm 7, and effective
vibration transmission can be performed.
14-04-2019
8
[0029]
Taking a magnetostrictive element as the actuator 100 as an example, the first embodiment will
be described with reference to FIGS. 1 (a) to (c) and FIGS. 2 (a) and 2 (b).
[0030]
[Actuator] FIG. 2 shows a schematic structure of the magnetostrictive actuator, wherein (a) is a
front view and (b) a side sectional view taken along the line 2B-2B in (a).
[0031]
As shown in FIG. 2 (b) as an example, the magnetostrictive actuator 100 includes a rod-like
magnetostrictive element 50, around which a solenoid coil 5 for applying a control magnetic field
to the magnetostrictive element 50 is wound. .
A magnet 4 and a yoke (not shown) are disposed around the solenoid coil 5.
The drive rod 1 is connected to one end of the magnetostrictive element 50, and a fixed disc
(bottom cap) 6 is attached to the other end. These are loaded in the outer casing case 2 together
with the cymbal-like internal preload spring 3 and the tip of the drive rod 1 projects out of the
outer casing case 2 after assembly and functions as a vibrator end 1a.
[0032]
As the characteristics of the magnetostrictive element 50, it is known that the stress distortion
(longitudinal dimensional change) response to the magnitude of the control magnetic field by the
solenoid coil 5 changes with the pressure applied in advance. In the magnetostrictive actuator
100 shown in FIGS. 2A and 2B, a pressure is applied by the internal preload spring 3 so as to
apply a preload smaller than the appropriate pressure. Also, a static magnetic field is provided by
the magnet 4 and the yoke or the like so as to use a region where the stress-strain response can
be regarded as linear in a wide range.
[0033]
14-04-2019
9
As the magnetostrictive element 50, using a columnar magnetostrictive element (ETREMA
Terfenol-D (registered trademark, super magnetostrictive material) manufactured by ETREMA
PRODUCTS INC) of 2 mm in length and about 10 mm in length, the outer case 2 is made of
aluminum A magnetostrictive actuator 100 having a diameter of 15 mm and a length of 40 mm
was produced.
[0034]
In addition, when transmitting the vibration to the diaphragm 7 from the actuator 100, the
appropriate pressurization to this actuator 100 was designed and manufactured so that it might
become 10 N / mm <2>.
[0035]
By inputting, for example, an audio signal as an input signal to the solenoid coil 5 of the
magnetostrictive actuator 100, it is possible to obtain a vibration output corresponding to the
audio signal from the transducer end 1a of the drive rod 1.
[0036]
For comparison, an acrylic plate shown below is used for the diaphragm 7, and the actuator 100
of FIGS. 2 (a) and 2 (b) is attached to the diaphragm 7 by the conventional method shown in FIG.
Pressure adjustment was performed, and the evaluation was performed by measuring the
reproduction sound pressure and the frequency.
[0037]
Acrylic board: ACRYLITE (registered trademark) L (Mitsubishi Rayon Co., Ltd.) Board thickness 1
mm, 2 mm and 3 mm Size 300 mm × 300 mm
[0038]
At this time, the measurement of the reproduced sound pressure-frequency characteristics was
performed under the following conditions.
Condition: Input 1 W, measurement distance 1 m (vertical direction from the center of
diaphragm)
14-04-2019
10
[0039]
As a result, when the thickness of the acrylic plate is 1 mm and 2 mm, the upper ends of the Lshaped angles 9-1 and 9-2 open as shown in FIG. Warpage occurred in the acrylic plate which is
the diaphragm 7, and it was not possible to obtain appropriate pressure (10 N / mm <2>) and
vibration was impossible.
When the plate is attached to an acrylic plate having a thickness of 3 mm, the upper ends of the
L-shaped angles 9-1 and 9-2 at the proper pressure are eliminated, and the actuator 100 can be
excited to generate sound. The
The measurement result of the reproduction sound pressure-frequency characteristic is shown
by a broken line 20 in FIG.
[0040]
As described above, in the conventional attachment method, the diaphragm 7 needs a plate
thickness of 3 mm, and in the case where the strength of the diaphragm 7 is low 1 mm and 2
mm, no sound can be generated by attaching the actuator 100. It was confirmed.
[0041]
[Vibration Transmission Device] An O-ring is made of a styrene butadiene rubber sheet having a
thickness of 1 mm having the characteristics shown below, and this O-ring is used as the
expansion and contraction member 12a of the coupling portion 12. Were joined to produce a
vibration transmission device as shown in FIGS. 1 (a) to 1 (c).
[0042]
Shape and rubber hardness of the created O-ring Shape: Outer diameter 15 mm, inner diameter 5
mm, thickness 1 mm Rubber hardness: JIS A 30Hs
[0043]
Here, the connection between the actuator 100 and the O-ring, and the vibration passive portion
11 and the O-ring were performed by bonding using a chloroprene rubber-based adhesive.
14-04-2019
11
[0044]
The size of the produced vibration transmission device is approximately 25 mm long, 20 mm
wide, and 40 mm long.
[0045]
The additional pressure stabilization coil spring 14 (see FIGS. 1B and 1C) is inserted into the
inside of the vibration transmission device, so that the stabilization by the vibration transmission
adjustment screw 10 can be further stabilized.
[0046]
The vibration transmission device manufactured as shown in FIGS. 1 (a) to 1 (c) is attached to the
1 mm thick acrylic plate used in the above-mentioned demonstration test, and the reproduced
sound pressure-frequency characteristics under the same conditions as the conventional
mounting method. The characteristics of the solid line 21 shown in FIG. 3 were obtained.
[0047]
In the conventional method, when the thickness of the acrylic plate (diaphragm plate 7) is 1 mm,
appropriate pressure (10 N / mm <2>) can not be applied, and sound generation by the actuator
100 is impossible. In the vibration transmission device of the embodiment, no distortion occurs
at all in the diaphragm 7 even if the appropriate pressure is applied, and application to the
diaphragm 7 having a small thickness, that is, the diaphragm 7 with low strength is possible. It
was confirmed.
[0048]
In addition, compared with the conventional example, the reproduction sound pressurefrequency characteristics are higher in the reproduction sound pressure in almost all frequency
bands, and can be applied to the diaphragm 7 with a thin plate thickness, so that the vibration
transmission efficiency is improved. It was confirmed.
In particular, at 4 KHz to 7 KHz where human sense of hearing is said to be high, the
reproduction sound pressure is increased by about 10 dB.
14-04-2019
12
That is, it was confirmed that the output to the input was high and the transfer energy efficiency
was good.
As described above, by using the stretchable material, an excellent vibration transmission effect
can be obtained, and vibration transmission at low frequencies can be efficiently performed.
[0049]
As shown in FIG. 4 using a piezoelectric actuator (ALS 170-C801 NPOLF made by NEC Tokin
Corp.) 100 'using the laminated piezoelectric element 17 shown below instead of the
magnetostrictive actuator 100 in the first embodiment described above. A vibration transmission
device was created.
The vibration transmission device shown in FIG. 4 is different from that in FIGS. 1 (a) to 1 (c) only
in the structure of the actuator, so the same parts as in FIGS. 1 (a) to 1 (c) Detailed description is
omitted.
[0050]
As shown in FIG. 4, the vibration transmission device having a structure in which the actuator
portion 13 and the vibration passive portion 11 are joined by the coupling portion 12 is attached
to an acrylic plate having a thickness of 1 mm as in the first embodiment. A pressure of 10 N /
mm <2> was applied in the longitudinal direction of '.
Although the warping of the diaphragm 7 was confirmed, no warping occurred at all, and it was
confirmed that the vibration state was also the same as in the first example.
As a result, it was confirmed that the same effect can be obtained by using the same structure as
the vibration transmission device of the present invention, even for other actuators that generate
the same vibration as the magnetostrictive actuator 100.
[0051]
14-04-2019
13
In addition, although the mechanism which adjusts a pressurization amount with the vibration
transmission adjustment screw 10 was employ | adopted in the above-mentioned Example 1 and
2, this invention is not limited to this.
For example, the actuator portion 13, the coupling portion 12 and the vibration passive portion
11 are joined in advance, and the actuator portion 13 is first fixed to the portion to be vibrated 7
by the mounting screws 16-2, 16-3, 16-5, 16-6. Do.
Then, in a state in which the vibration passive unit 11 and the actuator unit 13 are held so as to
obtain an appropriate amount of pressure by a jig or the like, the vibration passive unit 11 is
fixed by the mounting screws 16-1 and 16-4.
Even when integrated with such a configuration, the same effects as in the above-described first
and second embodiments can be obtained.
[0052]
Therefore, according to the present invention, it is possible to provide a vibration transmission
device and a vibration transmission method capable of applying an appropriate pressure to the
actuator without being affected by the strength of the portion to be vibrated and performing
effective vibration transmission. .
[0053]
By applying the vibration transmission device of the present invention in the field of an acoustic
system that generates sound using an actuator composed of a magnetostrictive element, a
laminated piezoelectric element, etc., the sound can be generated by the actuator regardless of
the strength of the vibrating portion become.
From this, the application range of the actuator can be expanded, and a new acoustic system can
be developed.
14-04-2019
14
[0054]
DESCRIPTION OF SYMBOLS 1 Drive rod 1a Vibrator end 2 Outer case 3 Internal preload spring 4
Magnet 5 Solenoid coil 6 Fixed board (bottom cap) 7 Diaphragm (vibrated part) 8-1, 8-2
Mounting screw 9-1, 9 2 L-shaped angle 10 Vibration transmission adjusting screw 11 Vibration
passive portion 12 Coupling portion 12a O-shaped rubber (stretching member) 13 Actuator
portion 14 Additional pressure stabilization coil spring 15-1 to 15-6 Mounting portion 16-1 to
16 -6 Mounting screw 17 Multilayer piezoelectric element 18-1 and 18-2 Mounting part 50
Magnetostrictive element 100 Actuator (Magnetostrictive actuator) 100 'Piezoelectric actuator
14-04-2019
15
Документ
Категория
Без категории
Просмотров
0
Размер файла
26 Кб
Теги
description, jp2012114671
1/--страниц
Пожаловаться на содержимое документа