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JP2003163990

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2003163990
[0001]
The present invention relates to an apparatus capable of transmitting precise vibrations with
little phase shift to liquids, gases, gel-like objects, rubber-like objects, etc., regardless of the
industrial equipment field or consumer goods field. Specifically, the present invention relates to a
vibration actuator having a diaphragm reinforcing rib extending in a vibration propagation
direction. As a typical application example of this vibration actuator, there can be mentioned
equipments such as a fluid precision vibration device, a precision measurement sound source, or
high fidelity music reproduction.
[0002]
2. Description of the Related Art In the past, vibration actuators of the type that radiates
vibration from a diaphragm have a low conversion unit efficiency by reducing the weight of the
vibration part as represented by a dynamic cone speaker having a paper diaphragm. It has been
developed in the range that followed this under the old design thought which tried to emphasize.
Therefore, no consideration was given to the characteristics or transient characteristics in the
minute vibration region, or it was completely incomplete.
[0003]
For example, in the case of a speaker for sound wave emission, for example, a large number of
diaphragms made of fiber reinforced plastic (FRP) or a honeycomb structure using a cloth made
of aramid fiber or carbon fiber were announced for a while from the consumer goods field. Then,
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it is not used except for a few.
[0004]
It is apparent from the viewpoint of material engineering that, even at first glance, high rigidity
can be obtained for the increase in weight, the rigidity is non-linear in the micro-vibration region
and naturally unsteady.
If this is to be expressed sensuously, it is awkward. Although the absolute value of the rigidity is
not high in this case, the old paper diaphragm is preferable because it still exhibits a linear or
linearly approximate stiffness.
[0005]
In addition, there is a dome type that uses a metal diaphragm as the diaphragm, but it is
considered as a very thin diaphragm, being bound by the previous design concept of reducing
the weight as described above. However, there is a disadvantage that the usable vibration
frequency range is limited due to the limitation of the resonance sharpness of the material.
[0006]
In order to eliminate such a drawback of the diaphragm, the diaphragm is also coated,
impregnated or attached with a rubber-like material, a damping material or the like that absorbs
energy with large hysteresis in stress-strain characteristics. However, although these damp the
resonance sharpness, they do not contribute at all to the solution of the essential problems such
as the improvement of the rigidity.
[0007]
From these facts, regarding the most important diaphragm in an actuator of the type that
radiates vibration from the diaphragm, as seen in the above example, it goes as far as to say
about the micro vibration region and transient behavior. As a whole, there was no intrinsic or
proper consideration for the desired vibrational radiation.
In addition, rubber-like materials and the like often have adverse effects, such as secondary
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induced vibrations in the materials.
[0008]
Therefore, the object of the present invention is to increase the rigidity of the diaphragm under
static stress and a large amount of stress or more, and also to perform complex vibration during
dynamic vibration. It is an object of the present invention to provide a vibration actuator which
can increase rigidity from a very small amplitude region and can realize precise operation
including transient characteristics under a wide range of vibration conditions.
[0009]
SUMMARY OF THE INVENTION In order to solve the above problems, a vibration actuator
according to the present invention is a vibration actuator having a diaphragm attached to a
power transmission unit, having a thickness of 60 micrometers or more and 5 millimeters or less.
Providing three or more diaphragm reinforcing ribs extending in the vibration propagation
direction to the diaphragm made of a highly rigid material having a longitudinal elastic modulus
of 68 GPa or more and crossing the vibration propagation direction without a dividing line and a
node It is characterized by
[0010]
In this vibration actuator, it is preferable that the vibration plate is formed of a vibration plate
formed by integrating a plurality of materials whose respective longitudinal elastic coefficients
are in a relation of 0.025 times or more and 40 times or less.
[0011]
Further, the diaphragm reinforcing rib can be configured as a completely separate member from
the diaphragm and the power transmission unit, or can be configured as a member integrated
with any member.
For example, a diaphragm reinforcing rib made of a material having a longitudinal elastic
modulus of 68 GPa or more and having high rigidity and no hysteresis in stress-strain
characteristics can be integrated with the power transmission portion.
[0012]
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Moreover, about a diaphragm, it can also be set as a single plate structure, and can also be set as
the structure on which the plate-shaped body of multiple sheets was laminated | stacked.
Particularly in the latter configuration, as shown in the embodiment described later, the
diaphragm can be easily assembled in a state where stress remains (that is, a configuration to
which prestress is applied). .
[0013]
Further, in the vibration actuator according to the present invention, a vibration plate support
portion for supporting the support of the vibration plate by the power transmission portion is
attached to the power transmission portion, and at least a part of the vibration plate support
portion A structure in which a material composed of ultrafine fibers having a fiber fineness of
0.0001 dtex or more and 5 dtex or less can be employed.
[0014]
Furthermore, also in the structure other than the above-mentioned diaphragm supporting
portion, a structure in which a material composed of microfibers having a single fiber fineness of
0.0001 dtex or more and 5 dtex or less is compounded on the surface of at least a part of
structural members Can be adopted.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a vibration actuator according to
the present invention will be described in detail along with the preferred embodiments with
reference to the drawings.
The vibration actuator according to the present invention has, as a basic member, a diaphragm
attached to the power transmission unit and three or more diaphragm reinforcing ribs provided
to the diaphragm and extending in the vibration propagation direction. .
[0016]
Specifically, first, the vibration plate is made of a material such as stainless steel, sapphire, or
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molybdenum having a high elastic coefficient, high rigidity, and good linearity in stress-strain
characteristics, and a direction in which vibration propagates. In other words, three or more
diaphragm reinforcing ribs are provided in a direction radially extending along the diaphragm as
viewed from the power transmission unit to increase the flexural rigidity of the diaphragm.
[0017]
The diaphragm used in the present invention is made of a high rigidity material having a
longitudinal elastic modulus of 68 GPa or more, more preferably 70 GPa or more.
This longitudinal elastic modulus is measured according to JIS-K7113.
Furthermore, a material with good linearity in stress-strain characteristics is suitable.
For example, stainless steel, chromium, duralumin, titanium, silicon carbide, sapphire, diamond
and the like are used, and rubber, leather and the like are not suitable.
[0018]
In the present invention, the diaphragm is configured by integrally integrating two or more
materials whose longitudinal elastic coefficients are in a relation of preferably 0.025 to 40 times,
more preferably 0.05 to 20 times each other. can do.
[0019]
The diaphragm is preferably a diaphragm of a composite structure formed by adhering a
vibration reinforcing plate made of a different material but also a rigid material to the diaphragm
base in a single layer or multi-layer contact.
In order to prevent the vibration propagation direction from crossing if the diaphragm base and
the vibration reinforcing plate are divided, it is generally desirable to be radial.
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The dividing line or node should not be provided or divided so as to cross the vibration
propagation direction as viewed from the power transmission unit. This is to prevent vibration
transmission.
[0020]
The rigidity of the material of the diaphragm base and the vibration reinforcing plate is desirably
as large as at least the diaphragm base can support its shape when attached to the power
transmission unit, and the vibration reinforcing plate has a high elastic coefficient. However, in
the present invention, in order to make both of the combined materials work effectively, the
difference in elastic modulus should be at most 40 times at most, more preferably 20 times or
less, and still more preferably 10 times or less. . It is desirable that the rubber-like material, that
is, the flexible material be configured without using one or the other, since the vibration damping
effect is not the main purpose.
[0021]
The thickness of the diaphragm base and the vibration reinforcing plate is preferably 50 μm or
more for the diaphragm base and 40 μm or more for the vibration reinforcing plate, and it is
desirable to be somewhat thick if weight and other conditions permit. The thickness of the whole
diaphragm is 60 μm or more, but in order to suppress the vibration propagation component in
the thickness direction, it is made not to exceed 5 mm or less, preferably 3 mm or less. Also, it
may be thinner as it goes to the outer peripheral part.
[0022]
Three or more diaphragm reinforcing ribs are attached as much as possible, and the mounting
position is generally on the back side of the diaphragm, but if there is a problem in assembly, it
may be on the front side or even on both sides Good.
[0023]
A transmission reinforcing rib can also be attached to the power transmission portion, which can
further increase the rigidity.
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In the present invention, the diaphragm reinforcing rib and the transmission reinforcing rib may
be integrated.
[0024]
Further, the diaphragm reinforcing rib may be formed in advance integrally with the diaphragm
base or the vibration reinforcing plate, and the transmission reinforcing rib may be integrally
formed with the power transmission portion.
[0025]
Furthermore, either or both of the diaphragm base and the vibration reinforcing plate are
warped, and the pressure is applied to the diaphragm of the composite structure by pressing and
sticking the members together, etc. As it remains assembled, it can pre-stress the grain
boundaries of the material.
This makes it possible to improve the linearity in the stress-strain characteristic even in an
extremely minute vibration region.
[0026]
The size, thickness, shape and the like of the diaphragm base and the vibration reinforcing plate
can be set arbitrarily. Specifically, the sizes may or may not be the same. Moreover, it is also
possible to make a shape into a polygon shape, and to make a cone shape or a dome shape
instead of a flat plate. Also, the thickness may be thickened at a portion close to the power
transmission portion.
[0027]
In order to suppress unnecessary vibration such as surface waves in at least a part of the
diaphragm supporting portion holding the diaphragm, for example, holding the diaphragm
through the power transmission portion, the single fiber fineness is usually 0.0001 dtex or more
and 5 dtex A material such as a non-woven fabric or a woven or knitted fabric consisting of
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ultrafine fibers of preferably 0.001 dtex or more and 1 dtex or less, more preferably 0.001 dtex
or more and 0.5 dtex or less is preferably used. It is preferable to constitute the material which
consists of an ultrafine fiber also on the inside and outside surface, and to prevent rereflection to
the inside of a member of a surface wave. Since the portion is applicable to any portion other
than the diaphragm, it is desirable to be implemented on as many surfaces as possible, as far as
the problems of heat dissipation, cost and the like allow.
[0028]
The material composed of the microfibers used as described above is significantly less effective if
it contains at least 50% by weight of fibers of 0.0001 dtex or more and 5 dtex or less. The
ultrafine fiber preferably has a modulus of longitudinal elasticity of 130 GPa or less, more
preferably 100 GPa or less, and still more preferably in the range of 4 to 40 GPa. When the
longitudinal modulus exceeds 130 GPa, there is a problem that the flexibility is lost and the effect
is reduced.
[0029]
Moreover, the specific gravity of this ultrafine fiber is preferably 0.5 to 12, and more preferably
1.0 to 2.5. Among these, 1.1 to 1.4 show particularly preferable effects.
[0030]
The ultrafine fibers may be long fibers or short fibers, but in the case of short fibers, they are
usually 1 mm or more, preferably 30 to 70 mm. Such microfibers include inorganic fibers such
as glass, aluminum, steel and stainless steel, and organic fibers capable of being microfibrillated
represented by silk, polyamide, polyester, polyolefin, polyether, polyurethane, polyacrylonitrile,
polysulfone and the like Although it can mention, in the present invention, the ultrafine fiber
which consists of polyester etc. is preferred.
[0031]
In the present invention, the material consisting of microfibers is formed into a sheet by weaving
as usual in the case of long fibers, or in the case of short fibers, for example, the abovementioned microfibers are known methods such as papermaking, card method, air lay method
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The sheet is used as it is, or when necessary, the fibers are intertwined or bound with a binder by
physical means such as needle punch or water jet punch.
[0032]
The following is a detailed description of preferred specific examples of ultrafine synthetic fibers.
As a means for forming and printing non-woven fabrics made of ultrafine fibers, there are direct
spinning methods such as melt blowing and spun bonding. Further, as an indirect method, split
type composite fiber or sea-island type composite fiber consisting of two or more components is
entangled with needle punch or water jet punch to form a fel, split type split composite fiber is
divided, or sea-island type The composite fiber is dewatered to form an ultrafine fiber to form an
ultrafine fiber non-woven fabric. The non-woven fabric obtained by these methods is applicable
as it is to the present invention, but in some cases it is also effective to use the fiber as partially
bound with a binder. This is obtained by adding a binder after or before ultrafine fiberization of
the non-woven fabric and solidifying the binder, but more preferably, the sheet thus obtained is
subjected to buffing treatment with sandpaper, etc. Accordingly, at least the surface is raised. It is
because the unnecessary vibration of the surface wave is suppressed by the raising of the
ultrafine fibers.
[0033]
At this time, as a resin used as a binder, a resin of low modulus is preferably used, and in addition
to polyurethane resin, acrylic resin, vinyl acetate resin, nitrile resin, etc., known binders may be
used if they are generally used as binders. It is usable. Also, in order to make the characteristics
of the ultrafine fibers in the present invention effective, the binder loading is made not to exceed
90% by weight with respect to the fiber weight, but is more preferably 50% by weight or less.
[0034]
Furthermore, in the present invention, it may be particularly preferable to use materials which
are made of the same ultrafine fibers or those which are not impregnated with a binder. In
particular, the binderless type sheet subjected to the water punching treatment is more likely to
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be finely rubbed because the fine fibers are more stable and entangled, and there is no factor to
inhibit the friction between the fibers. It is more preferable than the fiber non-woven fabric.
[0035]
The thickness of the sheet used in the present invention is preferably 0.1 mm or more and 5 mm
or less, more preferably 1 mm or more and 5 mm or less. When it is too thin, the effects of the
present invention become scarce.
[0036]
In the present invention, the use of the ultrafine fibers means that when natural vibration is
received due to vibration or acoustic energy, the natural vibration is widely distributed in the
super high frequency like white noise, unlike other members. This is because there is a feature
such as not having a peak.
[0037]
Since the diaphragm base and the vibration reinforcing plate are not both low rigidity materials
mainly intended for damping, the diaphragm of the composite structure configured can have
high rigidity.
Although the low-order resonance mode is not particularly advantageous over the thick single
material, it has an effect of suppressing the high-frequency resonance. Moreover, because the
rigidity is low and the hysteresis is not large like the damping material, the surface micro
deformation and the lateral vibration (in this case, generated in the thickness direction of the
material) generated according to the coefficient of lateral elasticity are the origin and secondarily
generated. Surface waves are not a problem. It is also for the purpose of making this effect more
effective that the rigidity difference is specified to be within 40 times and only one is made
extremely high in rigidity.
[0038]
When dividing the diaphragm base or the vibration reinforcement plate, consider that the
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vibration transmitted from the power transmission section advances radially, with the directional
arrangement, material crystal direction, and rigidity directivity being radial. It is desirable to do.
Since the concentric corrugation found conventionally is to lower the rigidity in the vibration
propagation direction conversely, in the present invention, the prohibition of nodes or divisions
crossing the vibration propagation direction is intentionally specified.
[0039]
Furthermore, it is preferable that the diaphragm reinforcing ribs be attached radially to the
diaphragm of the composite structure to enhance the rigidity. Generally, it is desirable to provide
it on the back side, but if there is an assembly problem, it may be on the front side, or it may be
on both sides for more rigidity. The rigidity can be further increased by attaching the
transmission reinforcing rib to the power transmission portion.
[0040]
In addition, by making the diaphragm base and / or the vibration reinforcing plate warp, and
pressing and adhering the laminate and so on, the stress remains in the diaphragm of the
composite structure, and the grain boundaries If prestressing is applied, rigidity and rigidity
linearity in a very small displacement region can be improved, and precise motion can be
obtained even for very minute vibrations. This is the opposite of the conventional FRP and
honeycomb defects previously described.
[0041]
Next, a vibration actuator according to the present invention will be described based on the
drawings. FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a vibration
actuator according to the present invention. In FIG. 1, the vibration actuator is formed by
providing three or more diaphragm reinforcing ribs 3 extending in the vibration propagation
direction (in the illustrated example, the direction in which the left and right spread in the
drawing) on the diaphragm 2 attached to the power transmission unit 1 The diaphragm 2 has a
structure in which the diaphragm base 2b and the vibration reinforcing plate 2a are laminated
and integrated. The shape of the power transmission unit 1 is not particularly limited, and may
be cylindrical or rod-like. Further, the shape of the diaphragm 2 is also not particularly limited,
and is not limited to a disk-like one or the like.
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[0042]
Specifically, it is made of, for example, a rigid non-rubber material having a thickness of 50 μm
or more and 9 mm or less and capable of maintaining self-supporting attached to power
transmission unit 1, and in a form crossing the vibration propagation direction The diaphragm
base 2b having no joint is a material different from the diaphragm base 2b and is not rubbery
and has an elastic coefficient of not less than electrons and 0.025 to 40 times the longitudinal
elastic coefficient of the diaphragm base 2b. A vibration actuator having a diaphragm 2 of a
composite structure in which a vibration reinforcing plate 2a having no dividing line and no joint
is adhered in a form crossing a vibration propagation direction made of a material having a
thickness of 40 μm to 9 mm. .
[0043]
In this vibration actuator, partially stabilized zirconia is used for the power transmission unit 1
and sapphire is used for the diaphragm reinforcing rib 3.
Since the diaphragm base 2 b is integrally cut out of the block of partially stabilized zirconia with
the power transmission unit 1, there is no structural joint here. The vibration reinforcing plate 2a
is made of sapphire. Further, the diaphragm reinforcing rib 3 can also be integrated with the
power transmission unit 1.
[0044]
In addition, 6 in FIG. 1 is connected to the power transmission part 1, and shows the diaphragm
support part which assists support of the diaphragm 2 through the power transmission part 1,
and 9 is connected to the circumference of the diaphragm 2 It is an edge as a protective or
sealing member that has no influence on the vibration characteristics of the diaphragm 2 at all.
[0045]
Although FIG. 1 exemplifies an electrodynamic vibration actuator as the actuator operation
principle, the vibration actuator of the present invention can be widely applied to electrostatic
and piezoelectric vibration actuators and the like, and in any case, the vibration force The
generation base 8 is firmly fixed, and the force is accurately transmitted from the vibration force
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generation portion 7 to the diaphragm 2.
The aforementioned ultrafine fibers are preferably provided on the inner and outer surfaces of
the vibration force generation base 8 so as to effectively suppress surface waves.
[0046]
Further, FIG. 2 shows a state in the middle of forming a diaphragm in a vibration actuator
according to another embodiment of the present invention. As shown in FIG. 2, when the
diaphragm base 2b and the vibration reinforcing plate 2a are in close contact, they are fabricated
in advance in a slightly curved shape, that is, the crown 4 is attached to the vibration reinforcing
plate and the diaphragm base, If this is integrated with a strong assembly pressure 5 (vibration
reinforcing plate and diaphragm base assembly pressure), the entire diaphragm can be
prestressed.
[0047]
According to the vibration actuator of the present invention, precise motion can be realized
under a wide range of vibration conditions, from very small amplitude region to complex
vibration and dynamic vibration and transient vibration. Therefore, the industrial equipment field
is not limited to the improvement of the conventional equipment, for example, for the purpose of
researching human's auditory pattern recognition that is highly sensitive to micromachines and
microbes, minute non-stationary components, etc. It is the first to offer ground-breaking
vibration actuators that can be expected to have unprecedented new applications in the fields of
consumer products and academic research.
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