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JP2011239159

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2011239159
To provide an actuator, an electroacoustic transducer, and an electroacoustic transducer that can
increase strength and efficiently convert electrical energy to acoustic energy while having a
simple structure. To provide an electronic device. In order to achieve the above object, an
actuator according to the present invention holds a shape memory plate made of a shape
memory alloy which returns to a stored shape by heating, and holds both surfaces of the shape
memory plate. A two-layer structure in which the shape memory plate is restored to the
memorized shape by applying an electric current between the both surfaces for heating, and
stopping the current application between the both surfaces to elastically deform the shape
memory plate. And a heating electrode layer. [Selected figure] Figure 1
Electro-acoustic transducer
[0001]
The present invention relates to an actuator, an electro-acoustic transducer, and an electronic
device including the electro-acoustic transducer.
[0002]
Examples of the electroacoustic transducer mounted on an electronic device such as a mobile
phone include an electrodynamic electroacoustic transducer including a permanent magnet and a
voice coil, a piezoelectric electroacoustic transducer using a piezoelectric ceramic, and the like.
05-05-2019
1
However, miniaturization of any electroacoustic transducer is difficult. Therefore, Patent
Document 1 or Patent Document 2 discloses an electroacoustic transducer using a shape
memory alloy for the purpose of downsizing.
[0003]
Japanese Utility Model Application Publication No. 60-153099 Japanese Patent Application
Publication No. 2007-150523
[0004]
In the invention described in Patent Document 1 mentioned above, in order to vibrate the
vibrating film, it is necessary to provide a pair of shape memory alloys having opposite
temperature characteristics, and the structure and control of the electroacoustic transducer are
complicated. There was a problem of becoming
[0005]
In the invention described in Patent Document 2 described above, a bidirectional shape memory
alloy is used as the shape memory alloy, and precise temperature control is required. Therefore,
the reliability and control of the operation of the electroacoustic transducer are There was a
problem that it became complicated.
[0006]
Therefore, in the present invention, an actuator, an electro-acoustic transducer, and an electroacoustic transducer that can increase the strength and efficiently convert electrical energy to
acoustic energy while having a simple structure are provided. It aims at providing an electronic
device.
[0007]
In order to achieve the above object, in the actuator according to the present invention, a shape
memory plate made of a shape memory alloy which returns to a memorized shape by heating,
and both surfaces of the shape memory plate are held between the both surfaces. A two-layered
heating electrode layer which restores the shape memory plate to the memorized shape by
applying current and heating, and elastically deforms the shape memory plate by stopping
current application between the both surfaces And
[0008]
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2
In order to achieve the above object, an electroacoustic transducer according to the present
invention comprises: a shape memory plate made of a shape memory alloy which returns to a
stored shape by heating; and both surfaces of the shape memory plate. The two-layer heating
which restores the shape memory plate to the memorized shape by applying an electric current
between both surfaces and heating it, and stopping the current application between the both
surfaces to elastically deform the shape memory plate. The actuator includes an actuator having
an electrode layer, and a vibrating film made of a polymer material in close contact with the
outside of one of the two heating electrode layers.
[0009]
Further, in order to achieve the above object, the electroacoustic transducer of the present
invention includes a shape memory plate made of a shape memory alloy which returns to a
stored shape by heating, and both surfaces of the shape memory plate. A two-layered structure
for resiliently deforming the shape memory plate by returning the shape memory plate to the
memorized shape by applying current to both surfaces to heat and store the shape memory plate
between the both surfaces. And a vibrating membrane made of a polymer material and in close
contact with one of the two heating electrode layers of the two heating electrodes between the
two actuators. Equipped with
[0010]
In order to achieve the above object, an electronic device provided with the electroacoustic
transducer according to the present invention comprises a shape memory plate made of a shape
memory alloy which returns to a shape stored by heating and both surfaces of the shape memory
plate. The shape memory plate is returned to the memorized shape by holding a current between
the both surfaces by heating and conducting the current, and deforming the shape memory plate
with elasticity by stopping the current supply between the both surfaces. An electro-acoustic
transducer comprising: an actuator having two heating electrode layers to be heated; and a
diaphragm made of a polymer material in close contact with the outside of one of the two heating
electrode layers of the two heating electrode layers. Equipped with
[0011]
Further, in order to achieve the above object, an electronic device provided with the
electroacoustic transducer according to the present invention is a shape memory plate made of a
shape memory alloy which returns to a stored shape by heating, and the shape memory plate
The shape memory plate is returned to its memorized shape by holding the both sides and
conducting current between the both sides to heat the shape memory plate, and stopping the
current supply between the both sides, the shape memory plate resiliently In close contact with
one of the two heating electrode layers of the two heating electrode layers between the two
05-05-2019
3
actuators and the two actuators having the two heating electrode layers that deform the And an
electroacoustic transducer having a vibrating membrane.
[0012]
According to the present invention, it is possible to increase the strength while having a simple
structure, and to efficiently convert electrical energy into acoustic energy.
[0013]
FIG. 2 is a schematic view of an embodiment of the actuator of the present invention.
FIG. 2 is a schematic view of an embodiment of the actuator of the present invention.
FIG. 2 is a schematic view of an embodiment of the actuator of the present invention.
FIG. 2 is a schematic view of an embodiment of the actuator of the present invention.
1 is a schematic view of an embodiment of the electroacoustic transducer of the present
invention.
1 is a schematic view of an embodiment of the electroacoustic transducer of the present
invention.
1 is a schematic view of an embodiment of the electroacoustic transducer of the present
invention.
1 is a schematic view of an embodiment of the electroacoustic transducer of the present
invention.
1 is a schematic view of an embodiment of the electroacoustic transducer of the present
05-05-2019
4
invention.
1 is a schematic view of an embodiment of the electroacoustic transducer of the present
invention.
1 is a schematic view of an embodiment of the electroacoustic transducer of the present
invention. 1 is a schematic view of an embodiment of the electroacoustic transducer of the
present invention. 1 is a schematic view of an embodiment of the electroacoustic transducer of
the present invention. It is the schematic of embodiment of the electronic device of this invention.
It is the schematic of embodiment of the electronic device of this invention. It is the schematic of
embodiment of the electronic device of this invention. It is the schematic of embodiment of the
electronic device of this invention. It is the schematic of embodiment of the electronic device of
this invention. It is the schematic of embodiment of the electronic device of this invention. It is
the schematic of embodiment of the electronic device of this invention. It is the schematic of
embodiment of the electronic device of this invention. It is the figure which performed the
characteristic comparison of the sound pressure level about the Example of this invention. It is a
figure showing the cellular phone concerning the example of the present invention. FIG. 1 shows
a laptop computer according to an embodiment of the present invention.
[0014]
Embodiments of the invention will be described with reference to the accompanying drawings.
The embodiments described below are examples of implementation of the present invention, and
the present invention is not limited to the following examples of implementation. In the present
specification and drawings, components having the same reference numerals denote the same
components.
[0015]
Embodiment of Actuator First, an embodiment of the actuator of the present invention will be
described with reference to FIG. FIG. 1 is a schematic view of the configuration of the actuator of
the present invention. As shown in FIG. 1, the shape memory plate 10-1 is made of a shape
memory alloy which returns to a stored shape by heating. The material of the shape memory
plate 10-1 is, for example, an alloy of titanium and nickel, or an alloy of titanium and nickel
mixed with copper, cobalt, or radium. The thickness of the shape memory plate is preferably 10
05-05-2019
5
μm or more and 2 mm or less. The two heating electrode layers 11-1 sandwich the both
surfaces of the shape memory plate 10-1 and have a shape storing the shape memory plate 10-1
by applying a current between the both surfaces for heating. Then, the shape memory plate 10-1
is elastically deformed by stopping the application of current between both surfaces. The force of
the shape memory plate 10-1 returning to the memorized shape when the heating electrode
layer 11-1 is energized is larger than the elasticity of the heating electrode layer 11-1, and the
shape memory plate 10-1 When the heating electrode layer 11-1 is stopped, the force to return
to the stored shape is smaller than the elasticity of the heating electrode layer 11-1. The
thickness of one layer of the heating electrode layer is preferably 5 μm or more and 100 μm or
less.
[0016]
As described, energy conversion can be efficiently performed from the electrical energy supplied
to the heating electrode layer 11-1 to acoustic energy generated by the deformation of the shape
memory plate 10-1. Furthermore, the strength of the actuator can be increased by forming a
laminated structure of the shape memory plate 10-1 and the heating electrode layer 11-1 while
having a simple structure of only the shape memory plate 10-1 and the heating electrode layer
11-1. It can be enhanced.
[0017]
Next, referring to FIG. 2, an embodiment of the actuator of the present invention will be
described. FIG. 2 is a schematic view of the configuration of the actuator of the present invention.
As shown in FIG. 2, even if it has an elastic member 12-1 in close contact with at least one
heating electrode layer 11-2 of the heating electrode layer 11-2 and elastically deforming the
shape memory plate 10-2 Good. The material of the elastic member 12-1 is, for example, a metal
or a resin-metal composite material.
[0018]
As described above, in addition to the configuration of FIG. 1, since the elastic member 12-1
assists in deforming the shape memory plate 10-2, the strength of the actuator can be increased.
[0019]
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6
Next, an embodiment of the actuator of the present invention will be described with reference to
FIG.
FIG. 3 is a schematic view of the configuration of the actuator of the present invention. As shown
in FIG. 3, a heat conductive material 13-1 is provided between the shape memory plate 10-3 and
the heating electrode layer 11-3 of at least one of the two heating electrode layers 11-3. It is also
good. The material of the heat conductive material 13-1 is, for example, copper, silver, or carbon
fiber. The heat conductivity of the heat conductive material is preferably 100 W / mk or more.
[0020]
As described above, in addition to the configuration of FIG. 1, furthermore, the heat conduction
material 13-1 efficiently transmits the heat generation from the heating electrode layer 11-3 to
the shape memory plate 10-3. It can be enhanced.
[0021]
Next, an embodiment of the actuator of the present invention will be described with reference to
FIG.
FIG. 4 is a schematic view of the configuration of the actuator of the present invention. As shown
in FIG. 4, a driving electrode layer 15 closely attached to at least one heating electrode layer 11-4
of the heating electrode layer 11-4 and applying a voltage to the piezoelectric ceramic 14-1 and
the piezoelectric ceramic 14-1. -1 may be provided. The material of the piezoelectric ceramic is,
for example, lead zirconate titanate (PZT).
[0022]
As described above, in addition to the configuration of FIG. 1, the strength of the actuator can be
increased because the piezoelectric ceramic 14-1 and the driving electrode layer 15-1 assist in
deforming the shape memory plate 10-4. .
[0023]
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(Embodiment of Electro-acoustic Transducer 1) First, an embodiment of the electro-acoustic
transducer of the present invention will be described with reference to FIG.
FIG. 5 is a schematic view of the configuration of the electroacoustic transducer of the present
invention. Description of the elements described in FIGS. 1 to 4 will be omitted. As shown in FIG.
5, the actuator has a shape memory plate 10-5 and two heating electrode layers 11-5. The
vibrating film 16-1 is in close contact with the outside of one of the two heating electrode layers
11-5 for heating and is made of an organic polymer material. The organic polymer material is,
for example, polyethylene terephthalate, polyethylene, polyurethane. The thickness of the
vibrating film 16-1 is preferably 5 μm or more and 1000 μm or less. Here, assuming that the
mass of the vibrating film is m, the length is L, and the compliance is C, the basic resonant
frequency f of the vibrating film can be obtained by the following equation. Thus, by changing
the material or thickness of the vibrating film 16-1, the fundamental resonance frequency of the
vibrating film 16-1 can be changed.
[0024]
As described, energy conversion can be efficiently performed from the electrical energy supplied
to the heating electrode layer 11-5 to acoustic energy generated as the shape memory plate 10-5
is deformed. Furthermore, since the fundamental resonance frequency can be changed by using
the vibrating film 16-1 whose material and structure can be changed, the vibrating film 16-1 is
added to the shape memory plate 10-5 and the heating electrode layer 11-5. While having a
simple structure, the sound pressure level generated by the electroacoustic transducer can be
adjusted. And since the electroacoustic transducer can be protected from impact by using the
organic polymer material for the vibrating membrane 16-1, the resistance to the use
environment can be enhanced.
[0025]
Next, an embodiment of the electroacoustic transducer of the present invention will be described
with reference to FIG. FIG. 6 is a schematic view of the configuration of the electroacoustic
transducer of the present invention. As shown in FIG. 6, the actuator is elastically shaped
memory plate between the heating electrode layer 11-6 and the vibrating film 16-2 or on the
opposite side of the heating electrode layer 11-6 to the vibrating film 16-2. You may have the
elastic member 12-2 which deform | transforms 10-6. The material of the elastic member 12-2
is, for example, a metal or a resin-metal composite material.
05-05-2019
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[0026]
As described above, in addition to the configuration of FIG. 5, the elastic member 12-2 further
assists in deforming the shape memory plate 10-6, so the sound pressure level of the
electroacoustic transducer is adjusted while having a simple structure. it can. Further, by using
an organic polymer material for the vibrating film 16-2, the electroacoustic transducer can be
protected from impact, and therefore, the resistance to the use environment can be enhanced.
[0027]
Next, with reference to FIG. 7, an embodiment of the electroacoustic transducer of the present
invention will be described. FIG. 7 is a schematic view of the configuration of the electroacoustic
transducer of the present invention. As shown in FIG. 7, the actuator includes a heat conductive
material 13-2 between the shape memory plate 10-7 and at least one of the two heating
electrode layers 11-7. You may have. The material of the heat conductive material 13-2 is, for
example, copper, silver, or carbon fiber. The heat conductivity of the heat conductive material is
preferably 100 W / mk or more. Moreover, as shown in FIG. 8, you may arrange | position the
heat-conductive material 13-3 so that an actuator may be enclosed.
[0028]
As described above, in addition to the configuration of FIG. 5, furthermore, in FIG. 7, the heat
conductive material 13-2 efficiently transmits the heat generation from the heating electrode
layer 11-7 to the shape memory plate 10-7, The sound pressure level of the electroacoustic
transducer can be adjusted while having a simple structure.
[0029]
Next, an embodiment of the electroacoustic transducer of the present invention will be described
with reference to FIG.
FIG. 9 is a schematic view of the configuration of the electroacoustic transducer of the present
invention. As shown in FIG. 9, the actuator applies a voltage to the piezoelectric ceramic 14-2 and
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9
the piezoelectric ceramic 14-2 between the heating electrode layer 11-9 and the vibrating film
16-5. 2 may be provided. The material of the piezoelectric ceramic is, for example, lead zirconate
titanate (PZT).
[0030]
As described above, in addition to the configuration of FIG. 5, the piezoelectric ceramic 14-2 and
the driving electrode layer 15-2 assist the deformation of the shape memory plate 10-9, so that
the electroacoustics can be realized while having a simple structure The sound pressure level of
the transducer can be adjusted.
[0031]
(Embodiment of Electro-acoustic Transducer 2) First, with reference to FIG. 10, an embodiment
of the electro-acoustic transducer of the present invention will be described.
FIG. 10 is a schematic view of the configuration of the electroacoustic transducer of the present
invention. Description of the elements described in FIGS. 1 to 9 is omitted. As shown in FIG. 10,
each of the two actuators has a shape memory plate 10-10 and two heating electrode layers 1110. The vibrating film 16-6 is in close contact with one of the two heating electrode layers 11-10
for heating and is made of an organic polymer material. The organic polymer material is, for
example, polyethylene terephthalate, polyethylene, polyurethane. The thickness of the vibrating
film 16-6 is preferably 5 μm or more and 1000 μm or less.
[0032]
As described, energy conversion can be efficiently performed from the electrical energy supplied
to the heating electrode layer 11-10 to acoustic energy generated by deformation of the shape
memory plate 10-10. Further, since the actuators are disposed on both sides of the vibrating film
16-6, it is possible to realize conversion of energy of a larger capacity. Then, since the basic
resonance frequency can be changed by using the vibrating film 16-6 which can change the
material and the structure, the vibrating film 16-6 is added to the shape memory plate 10-10 and
the heating electrode layer 11-10. While having a simple structure, the sound pressure level
generated by the electroacoustic transducer can be adjusted. Furthermore, since the vibrating
membrane 16-6 can protect the electroacoustic transducer from impact by using an organic
polymer material, the resistance to the use environment can also be enhanced.
05-05-2019
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[0033]
Next, an embodiment of the electroacoustic transducer of the present invention will be described
with reference to FIG. FIG. 11 is a schematic view of the configuration of the electroacoustic
transducer of the present invention. As shown in FIG. 11, at least one of the two actuators is
between the heating electrode layer 11-11 and the vibrating membrane 16-7 or the vibrating
membrane 16-7 of the heating electrode layer 11-11. The opposite side may have an elastic
member 12-3 that elastically deforms the shape memory plate 10-11. The material of the elastic
member is, for example, a metal or a resin-metal composite material.
[0034]
As described above, in addition to the configuration of FIG. 10, the elastic member 12-3 further
assists in deforming the shape memory plate 10-11, so that the sound pressure level of the
electroacoustic transducer can be reduced while providing a simple structure. It can be adjusted.
[0035]
Next, an embodiment of the electroacoustic transducer of the present invention will be described
with reference to FIG.
FIG. 12 is a schematic view of the configuration of the electroacoustic transducer of the present
invention. As shown in FIG. 12, at least one of the two actuators is between the shape memory
plate 10-12 and at least one of the heating electrode layers 11-12 of the two heating electrode
layers 11-12. May have a heat conductive material 13-4. The material of the heat transfer
material is, for example, copper, silver or carbon fiber. The heat conductivity of the heat
conductive material is preferably 100 W / mk or more.
[0036]
As described above, in addition to the configuration of FIG. 10, since the heat transfer material
13-4 efficiently transfers the heat generation from the heating electrode layer 11-12 to the shape
memory plate 10-12, a simple structure is provided. While, the sound pressure level of the
electroacoustic transducer can be adjusted.
05-05-2019
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[0037]
Next, with reference to FIG. 13, an embodiment of the electro-acoustic transducer of the present
invention will be described.
FIG. 13 is a schematic view of the configuration of the electroacoustic transducer of the present
invention. As shown in FIG. 13, at least one of the two actuators has a voltage applied to the
piezoelectric ceramic 14-3 and the piezoelectric ceramic 14-3 between the heating electrode
layer 11-13 and the vibrating film 16-9. You may provide the drive electrode layer 15-3 to apply.
The material of the piezoelectric ceramic is, for example, lead zirconate titanate (PZT).
[0038]
As described above, in addition to the configuration shown in FIG. 10, the piezoelectric ceramic
14-3 and the driving electrode layer 15-3 further assist in deforming the shape memory plate
10-13, so that the structure is simplified. In addition, the sound pressure level of the
electroacoustic transducer can be adjusted.
[0039]
(Embodiment of Electronic Device 1) First, an embodiment of the electronic device of the present
invention will be described with reference to FIG.
FIG. 14 is a schematic view of the configuration of the electronic device of the present invention.
Description of the elements described in FIGS. 1 to 13 is omitted. As shown in FIG. 14, the
actuator has a shape memory plate 10-14 and two heating electrode layers 11-14. The vibrating
film 16-10 is in close contact with the outside of one of the two heating electrode layers 11-14
and is made of an organic polymer material. The organic polymer material is, for example,
polyethylene terephthalate, polyethylene, polyurethane. The thickness of the vibrating film 16-10
is preferably 5 μm or more and 1000 μm or less. The support 17-1 is provided in the electronic
device and fixes the both ends of the vibrating membrane 16-10 of the electroacoustic
transducer. In order to efficiently transmit vibration energy from the vibrating membrane 16-10,
it is preferable that the material has a certain degree of rigidity with respect to the amount of
transferred vibration.
05-05-2019
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[0040]
As described, energy conversion can be efficiently performed from the electrical energy supplied
to the heating electrode layer 11-14 to acoustic energy generated by deformation of the shape
memory plate 10-14. In addition, since the fundamental resonance frequency can be changed by
using the vibrating film 16-10 whose material and structure can be changed, the vibrating film
16-10 is added to the shape memory plate 10-14 and the heating electrode layer 11-14. While
having a simple structure, the sound pressure level generated by the electroacoustic transducer
can be adjusted. In addition, since the vibrating membrane 16-10 can protect the electroacoustic
transducer from impact by using an organic polymer material, the resistance to the use
environment can also be enhanced.
[0041]
Next, an embodiment of the electronic device of the present invention will be described with
reference to FIG. FIG. 15 is a schematic view of the configuration of the electronic device of the
present invention. As shown in FIG. 15, the actuator is elastically shaped memory plate between
the heating electrode layer 11-15 and the vibrating film 16-11 or on the opposite side of the
heating electrode layer 11-15 to the vibrating film 16-11. You may have the elastic member 12-4
which deform | transforms 10-15. The material of the elastic member is, for example, a metal or
a resin-metal composite material.
[0042]
As described above, in addition to the configuration of FIG. 14, the elastic member 12-4 further
assists the deformation of the shape memory plate 10-15, so that the sound pressure level of the
electroacoustic transducer can be It can be adjusted.
[0043]
Next, an embodiment of the electronic device of the present invention will be described with
reference to FIG.
FIG. 16 is a schematic view of the configuration of the electronic device of the present invention.
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13
As shown in FIG. 16, the actuator has a heat conductive material 13-5 between the shape
memory plate 10-16 and at least one of the two heating electrode layers 11-16. You may have. In
addition, the material of the heat conductive material 13-5 is copper, silver, or a carbon fiber, for
example. The heat conductivity of the heat conductive material is preferably 100 W / mk or
more.
[0044]
As described above, in addition to the configuration of FIG. 14, the heat conductive material 13-5
further efficiently transfers the heat generation from the heating electrode layer 11-16 to the
shape memory plate 10-16, so that a simple structure is provided. While, the sound pressure
level of the electroacoustic transducer can be adjusted.
[0045]
Next, an embodiment of the electronic device of the present invention will be described with
reference to FIG.
FIG. 17 is a schematic view of the configuration of the electronic device of the present invention.
As shown in FIG. 17, the actuator further applies a voltage to the piezoelectric ceramic 14-4 and
the piezoelectric ceramic 14-4 between the heating electrode layer 11-17 and the vibrating film
16-13. 15-4 may be provided. The material of the piezoelectric ceramic 14-4 is, for example, lead
zirconate titanate (PZT).
[0046]
As described above, in addition to the configuration of FIG. 14, the piezoelectric ceramic 14-4
and the driving electrode layer 15-4 further assist in deforming the shape memory plate 10-17,
thus providing a simple structure while also providing electricity. The sound pressure level of the
acoustic transducer can be adjusted.
[0047]
(Embodiment of Electronic Device 2) First, an embodiment of the electronic device of the present
invention will be described with reference to FIG.
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14
FIG. 18 is a schematic view of the configuration of the electronic device of the present invention.
The description of the elements described in FIGS. 1 to 17 will be omitted. As shown in FIG. 18,
each of the two actuators has a shape memory plate 10-18 and two heating electrode layers 1118. The vibrating film 16-14 is in close contact with one of the two heating electrode layers 1118 for heating and is made of an organic polymer material. The organic polymer material is, for
example, polyethylene terephthalate, polyethylene, polyurethane. The thickness of the vibrating
film 16-14 is preferably 5 μm or more and 1000 μm or less.
[0048]
As described, energy conversion can be efficiently performed from the electrical energy supplied
to the heating electrode layer 11-18 to acoustic energy generated by deformation of the shape
memory plate 10-18. Further, since the actuators are disposed on both sides of the vibrating film
16-14, it is possible to realize conversion of energy of a larger capacity. Then, since the
fundamental resonance frequency can be changed by using the vibrating film 16-14 whose
material and structure can be changed, the vibrating film 16-14 is added to the shape memory
plate 10-18 and the heating electrode layer 11-18. While having a simple structure, the sound
pressure level generated by the electroacoustic transducer can be adjusted. Furthermore, the
vibrating membrane 16-14 can protect the electroacoustic transducer from impact by using an
organic polymer material, so that the resistance to the use environment can also be enhanced.
[0049]
Next, an embodiment of the electronic device of the present invention will be described with
reference to FIG. FIG. 19 is a schematic view of the configuration of the electronic device of the
present invention. As shown in FIG. 19, at least one of the two actuators is between the heating
electrode layer 11-19 and the vibrating membrane 16-15 or the vibrating membrane 16-15 of
the heating electrode layer 11-19. The opposite side may have an elastic member 12-5 that
elastically deforms the shape memory plate 10-19. The material of the elastic member is, for
example, a metal or a resin-metal composite material.
[0050]
As described above, in addition to the configuration of FIG. 18, since elastic member 12-5 assists
in deforming shape memory plate 10-19, the sound pressure level of the electroacoustic
transducer is adjusted while having a simple structure. it can.
05-05-2019
15
[0051]
Next, an embodiment of the electronic device of the present invention will be described with
reference to FIG.
FIG. 20 is a schematic view of the configuration of the electronic device of the present invention.
As shown in FIG. 20, at least one of the two actuators is between the shape memory plate 10-20
and at least one of the two heating electrode layers 11-20. May have a heat conductive material
13-6. The material of the heat conductive material is, for example, copper, silver or carbon fiber.
The heat conductivity of the heat conductive material is preferably 100 W / mk or more.
[0052]
As described above, in addition to the configuration of FIG. 18, the heat conductive material 13-6
efficiently transfers the heat generation from the heating electrode layer 11-20 to the shape
memory plate 10-20, so that the structure is simplified. In addition, the sound pressure level of
the electroacoustic transducer can be adjusted.
[0053]
Next, an embodiment of the electronic device of the present invention will be described with
reference to FIG.
FIG. 21 is a schematic view of the configuration of the electronic device of the present invention.
As shown in FIG. 21, at least one of the two actuators applies a voltage to the piezoelectric
ceramic 14-5 and the piezoelectric ceramic 14-5 between the heating electrode layer 11-21 and
the vibrating film 16-17. You may provide the drive electrode layer 15-5 to apply. The material
of the piezoelectric ceramic is, for example, lead zirconate titanate (PZT).
[0054]
As described above, in addition to the configuration of FIG. 18, the piezoelectric ceramic 14-5
and the driving electrode layer 15-5 further assist the deformation of the shape memory plate
10-21, so that the electroacoustics is formed while having a simple structure. The sound pressure
05-05-2019
16
level of the transducer can be adjusted.
[0055]
The characteristic evaluation of the electroacoustic transducer of the present invention was
performed with three evaluation items of Evaluation 1 to Evaluation 3.
(Evaluation 1) Measurement of Sound Pressure Level Frequency Characteristic The sound
pressure level when an AC voltage of 1 V was input was measured by a microphone placed at a
predetermined distance from the electroacoustic transducer. The predetermined distance is 10
cm unless otherwise specified, and the frequency measurement range is 10 Hz to 10 kHz.
(Evaluation 2) Flatness Measurement of Sound Pressure Level Frequency Characteristic The
sound pressure level at the time of AC voltage 1 V input was measured by a microphone
disposed at a predetermined distance from the electroacoustic transducer. The measurement
range of the frequency was 10 Hz to 10 kHz, and in the measurement range of 2 kHz to 10 kHz,
the flatness of the sound pressure level frequency characteristic was measured by the sound
pressure level difference between the maximum sound pressure level Pmax and the minimum
sound pressure level Pmin. As a result, the sound pressure level difference which is the
difference between the maximum sound pressure level Pmax and the minimum sound pressure
level Pmin is 20 dB or less as ○, and 20 dB or more as x. This predetermined distance is 10 cm
unless otherwise stated. (Evaluation 3) Drop Impact Test A cell phone equipped with an electroacoustic transducer was allowed to naturally drop 5 times from directly above 50 cm.
Destruction of cracks and the like after the drop impact test was visually confirmed, and the
sound pressure level characteristics after the test were measured. As a result, the sound pressure
level difference which is the difference between the sound pressure level before the test and the
sound pressure level after the test is 3 dB as ○ and 3 dB as ×.
[0056]
Below, the evaluation result of an Example and a comparative example is described. In addition,
the sound pressure level frequency characteristic of evaluation 1 is compared with an Example
and a comparative example, and the result is put together and described in FIG.
[0057]
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17
Example 1 The characteristics of the electro-acoustic transducer shown in FIG. 5 of the present
invention were evaluated. The evaluation results are as follows. Sound pressure level (1 kHz): 84
dB Sound pressure level (3 kHz): 82 dB Sound pressure level (5 kHz): 81 dB Sound pressure level
(10 kHz): 85 dB Flatness of sound pressure level frequency characteristics: ○ Falling impact
stability: ○ Above As is clear from the results, according to the electroacoustic transducer of this
example, it was demonstrated that the sound pressure level frequency characteristic is flat, high
volume reproduction is possible, and high reliability is obtained.
[0058]
Comparative Example 1 A similar test was performed on a conventional electrodynamic
electroacoustic transducer. Sound pressure level (1 kHz): 77 dB Sound pressure level (3 kHz): 75
dB Sound pressure level (5 kHz): 76 dB Sound pressure level (10 kHz): 97 dB Flatness of sound
pressure level frequency characteristic: × Drop shock stability: ×
[0059]
Example 2 The characteristics of the electro-acoustic transducer shown in FIG. 8 of the present
invention were evaluated. The evaluation results are as follows. Sound pressure level (1 kHz): 83
dB Sound pressure level (3 kHz): 85 dB Sound pressure level (5 kHz): 83 dB Sound pressure level
(10 kHz): 87 dB Flatness of sound pressure level frequency characteristics: ○ Falling impact
stability: ○ Above As apparent from the results, according to the electro-acoustic transducer of
the present embodiment, it has the same characteristics as the first embodiment, the sound
pressure level frequency characteristic is flat, and high volume reproduction is possible. It has
been proved to have high reliability.
[0060]
Example 3 The characteristics of the electro-acoustic transducer shown in FIG. 7 of the present
invention were evaluated. The evaluation results are as follows. Sound pressure level (1 kHz): 86
dB Sound pressure level (3 kHz): 85 dB Sound pressure level (5 kHz): 83 dB Sound pressure level
(10 kHz): 81 dB Flatness of sound pressure level frequency characteristics: ○ Falling impact
stability: ○ Above As apparent from the results, according to the electro-acoustic transducer of
the present embodiment, it has the same characteristics as the first embodiment, the sound
05-05-2019
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pressure level frequency characteristic is flat, and high volume reproduction is possible. It has
been proved to have high reliability.
[0061]
Example 4 The characteristics of the electro-acoustic transducer shown in FIG. 9 of the present
invention were evaluated. The evaluation results are as follows. Sound pressure level (1 kHz): 81
dB Sound pressure level (3 kHz): 82 dB Sound pressure level (5 kHz): 80 dB Sound pressure level
(10 kHz): 80 dB Flatness of sound pressure level frequency characteristics: ○ Falling impact
stability: ○ Above As apparent from the results, according to the electro-acoustic transducer of
the present embodiment, it has the same characteristics as the first embodiment, the sound
pressure level frequency characteristic is flat, and high volume reproduction is possible. It has
been proved to have high reliability.
[0062]
Example 5 The characteristics of the electroacoustic transducer shown in FIG. 6 of the present
invention were evaluated. The evaluation results are as follows. Sound pressure level (1 kHz): 79
dB Sound pressure level (3 kHz): 80 dB Sound pressure level (5 kHz): 83 dB Sound pressure level
(10 kHz): 81 dB Flatness of sound pressure level frequency characteristics: ○ Falling impact
stability: ○ Above As apparent from the results, according to the electro-acoustic transducer of
the present embodiment, it has the same characteristics as the first embodiment, the sound
pressure level frequency characteristic is flat, and high volume reproduction is possible. It has
been proved to have high reliability.
[0063]
(Example 6) The electro-acoustic transducer tested in Example 1 is mounted at the installation
place 100-1 of the electro-acoustic transducer of the mobile phone as shown in FIG. 23, and 10
cm away from the electro-acoustic transducer The sound pressure level and the frequency
characteristic were measured by the microphone disposed at the position. In addition, a drop
impact test was also conducted. The evaluation results are as follows. Sound pressure level (1
kHz): 79 dB Sound pressure level (3 kHz): 80 dB Sound pressure level (5 kHz): 82 dB Sound
pressure level (10 kHz): 81 dB Flatness of sound pressure level frequency characteristics: ○
Falling impact stability: ○ Falling impact The test was measured after 5 drops, no cracking of the
05-05-2019
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electroacoustic transducer was observed, and the sound pressure level (1 kHz) was 77 dB.
[0064]
(Example 7) The electro-acoustic transducer tested in Example 2 is mounted at the installation
place 100-1 of the electro-acoustic transducer of the mobile phone as shown in FIG. 23, and 10
cm away from the electro-acoustic transducer The sound pressure level and the frequency
characteristic were measured by the microphone disposed at the position. In addition, a drop
impact test was also conducted. The evaluation results are as follows. Sound pressure level (1
kHz): 81 dB Sound pressure level (3 kHz): 78 dB Sound pressure level (5 kHz): 81 dB Sound
pressure level (10 kHz): 83 dB Flatness of sound pressure level frequency characteristics: ○
Falling impact stability: ○ Falling impact The test was measured after 5 drops, no cracking of the
electroacoustic transducer was observed, and the sound pressure level (1 kHz) was 78 dB.
[0065]
(Example 8) The electro-acoustic transducer tested in Example 3 is mounted at the installation
place 100-1 of the electro-acoustic transducer of the mobile phone as shown in FIG. 23, and 10
cm away from the electro-acoustic transducer The sound pressure level and the frequency
characteristic were measured by the microphone disposed at the position. In addition, a drop
impact test was also conducted. The evaluation results are as follows. Sound pressure level (1
kHz): 83 dB Sound pressure level (3 kHz): 81 dB Sound pressure level (5 kHz): 84 dB Sound
pressure level (10 kHz): 85 dB Flatness of sound pressure level frequency characteristics: ○
Falling impact stability: ○ Falling impact The test was measured after 5 drops, no cracking of the
electroacoustic transducer was observed, and the sound pressure level (1 kHz) was 81 dB.
[0066]
(Example 9) The electro-acoustic transducer tested in Example 4 is mounted at the installation
place 100-1 of the electro-acoustic transducer of the mobile phone as shown in FIG. 23, and 10
cm away from the electro-acoustic transducer The sound pressure level and the frequency
characteristic were measured by the microphone disposed at the position. In addition, a drop
impact test was also conducted. The evaluation results are as follows. Sound pressure level (1
kHz): 81 dB Sound pressure level (3 kHz): 80 dB Sound pressure level (5 kHz): 82 dB Sound
pressure level (10 kHz): 82 dB Flatness of sound pressure level frequency characteristics: ○
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Falling impact stability: ○ Falling impact The test was measured after 5 drops, no cracking of the
electroacoustic transducer was observed, and the sound pressure level (1 kHz) was 79 dB.
[0067]
(Example 10) The electro-acoustic transducer tested in Example 5 is mounted at the installation
place 100-1 of the electro-acoustic transducer of the mobile phone as shown in FIG. 23, and 10
cm away from the electro-acoustic transducer The sound pressure level and the frequency
characteristic were measured by the microphone disposed at the position. In addition, a drop
impact test was also conducted. The evaluation results are as follows. Sound pressure level (1
kHz): 77 dB Sound pressure level (3 kHz): 81 dB Sound pressure level (5 kHz): 79 dB Sound
pressure level (10 kHz): 86 dB Flatness of sound pressure level frequency characteristics: ○
Falling impact stability: ○ Falling impact The test was measured after 5 drops, no cracking of the
electroacoustic transducer was observed, and the sound pressure level (1 kHz) was 75 dB.
[0068]
(Example 11) The electro-acoustic transducer tested in Example 1 is mounted on the installation
location 100-2 of the electro-acoustic transducer of a laptop computer as shown in FIG. 24 and
10 cm from the electro-acoustic transducer Sound pressure levels and frequency characteristics
were measured by microphones placed at remote locations. In addition, a drop impact test was
also conducted. The evaluation results are as follows. Sound pressure level (1 kHz): 77 dB Sound
pressure level (3 kHz): 80 dB Sound pressure level (5 kHz): 82 dB Sound pressure level (10 kHz):
79 dB Flatness of sound pressure level frequency characteristics: ○ Drop impact stability: ○
Drop impact The test was measured after 5 drops, no cracking of the electroacoustic transducer
was observed, and the sound pressure level (1 kHz) was 75 dB.
[0069]
Some or all of the above embodiments may be described as in the following appendices, but is
not limited to the following. (Supplementary Note 1) A shape memory plate made of a shape
memory alloy that returns to a stored shape by heating, and sandwiching both sides of the shape
memory plate, and applying a current between the both sides and heating the shape memory
plate. An actuator comprising: two memory electrode layers for restoring the shape memory
plate to a memorized shape and for deforming the shape memory plate with elasticity by
05-05-2019
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stopping current conduction between the both surfaces. (Supplementary Note 2) The actuator
according to Supplementary Note 1, further comprising an elastic member in close contact with
at least one heating electrode layer of the heating electrode layer, and elastically deforming the
shape memory plate. (Supplementary Note 3) The actuator according to Supplementary note 1 or
2, wherein a heat conductive material is provided between the shape memory plate and at least
one of the two heating electrode layers of the two heating electrode layers. (Supplementary Note
4) Any one of Supplementary Notes 1 to 3 further comprising a driving electrode layer in close
contact with at least one of the heating electrode layers of the heating electrode layer and
applying a voltage to the piezoelectric ceramic and the piezoelectric ceramic. The actuator
described in. (Supplementary Note 5) A shape memory plate made of a shape memory alloy that
returns to a stored shape by heating, and both surfaces of the shape memory plate are held, and
current is supplied between the both surfaces to heat the above The shape memory plate is
returned to the memorized shape, and an actuator having two heating electrode layers for
elastically deforming the shape memory plate by stopping the application of current between the
both surfaces, and heating the two layers An electroacoustic transducer comprising: a vibrating
film made of a polymer material in close contact with the outside of one of the heating electrode
layers of the electrode layers. (Supplementary Note 6) The actuator may have an elastic member
that elastically deforms the shape memory plate between the heating electrode layer and the
vibrating membrane or on the opposite side of the heating electrode layer to the vibrating
membrane. The electroacoustic transducer according to appendix 5, characterized in that
(Supplementary Note 7) The actuator according to Supplementary Note 5 or 6, characterized in
that a heat conducting material is provided between the shape memory plate and at least one of
the two heating electrode layers of the two heating electrode layers. Electro-acoustic transducer.
(Supplementary Note 8) The actuator includes a piezoelectric ceramic and a driving electrode
layer for applying a voltage to the piezoelectric ceramic, between the heating electrode layer and
the vibrating film. An electroacoustic transducer according to any one of the preceding claims.
(Supplementary Note 9) A shape memory plate made of a shape memory alloy which returns to a
shape stored by heating, and both surfaces of the shape memory plate are held, and current is
supplied between the both surfaces to heat the above-mentioned. The shape memory plate is
returned to the memorized shape, and two actuators having two heating electrode layers for
elastically deforming the shape memory plate by stopping the application of current between the
two surfaces; An electro-acoustic transducer comprising: a diaphragm made of a polymer
material in intimate contact with one of the two heating electrode layers of the two layers
between the individual actuators.
(Supplementary Note 10) Of the two actuators, at least one of the shape memory plate is resilient
between the heating electrode layer and the vibrating membrane or on the opposite side of the
heating electrode layer to the vibrating membrane. The electroacoustic transducer according to
appendix 9, further comprising an elastic member for deforming (Supplementary Note 11) At
least one of the two actuators has a heat conductive material between the shape memory plate
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and at least one of the two heating electrode layers of the heating electrode layer. The
electroacoustic transducer according to appendix 9 or 10 (Supplementary Note 12) At least one
of the two actuators includes a piezoelectric ceramic and a driving electrode layer for applying a
voltage to the piezoelectric ceramic, between the heating electrode layer and the vibrating film.
The electroacoustic transducer according to any one of appendices 9 to 11. (Supplementary Note
13) A shape memory plate made of a shape memory alloy that returns to a stored shape by
heating, and both surfaces of the shape memory plate are held, and a current is supplied between
the both surfaces to heat the surface. The shape memory plate is returned to the memorized
shape, and an actuator having two heating electrode layers for elastically deforming the shape
memory plate by stopping the application of current between the both surfaces, and heating the
two layers An electronic device comprising an electro-acoustic transducer having a vibrating film
made of a polymer material and in close contact with the outside of one of the heating electrode
layers of the electrode layers. (Supplementary Note 14) The actuator may have an elastic
member that elastically deforms the shape memory plate between the heating electrode layer
and the vibrating membrane or on the opposite side of the heating electrode layer to the
vibrating membrane. The electronic device according to appendix 13, characterized in that
(Supplementary Note 15) The actuator according to Supplementary Note 13 or 14, characterized
in that a heat conductive material is provided between the shape memory plate and at least one
of the two heating electrode layers of the two heating electrode layers. Electronic devices.
(Supplementary Note 16) The actuator further includes a piezoelectric ceramic and a driving
electrode layer for applying a voltage to the piezoelectric ceramic, between the heating electrode
layer and the vibrating film. Electronic device according to any of the. (Supplementary Note 17) A
shape memory plate made of a shape memory alloy that returns to a stored shape by heating,
and both surfaces of the shape memory plate are held, and current is supplied between the both
surfaces to heat the above-mentioned. The shape memory plate is returned to the memorized
shape, and two actuators having two heating electrode layers for elastically deforming the shape
memory plate by stopping the application of current between the two surfaces; An electronic
apparatus comprising: an electroacoustic transducer including a vibrating film made of a polymer
material and in close contact with one of the two heating electrode layers among the two
actuators.
(Supplementary Note 18) Of the two actuators, at least one of the shape memory plate is resilient
between the heating electrode layer and the vibrating membrane or on the opposite side of the
heating electrode layer to the vibrating membrane. 24. The electronic device as set forth in
appendix 17, further comprising an elastic member that deforms. (Supplementary Note 19) At
least one of the two actuators has a thermal conductive material between the shape memory
plate and at least one of the two heating electrode layers. The electronic device according to
Appendix 17 or 18. (Supplementary Note 20) At least one of the two actuators includes a
piezoelectric ceramic and a drive electrode layer for applying a voltage to the piezoelectric
ceramic, between the heating electrode layer and the vibrating film. The electronic device
05-05-2019
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according to any one of appendices 17 to 19.
[0070]
10-1, 10-2, 10-3, 10-4, 10-5, 10-6, 10-7, 10-8, 10-9, 10-10, 10-11, 10-12, 10- 13, 10-14, 10-15,
10-16, 10-17, 10-18, 10-19, 10-20, 10-21: shape memory plates 11-1, 11-2, 11-3, 11 -4, 11-5,
11-6, 11-7, 11-8, 11-9, 11-10, 11-11, 11-12, 11-13, 11-14, 11-15, 11-16 , 11-17, 11-18, 11-19,
11-20, 11-21: heating electrode layers 12-1, 12-2, 12-3, 12-4, 12-5: elastic members 13-1 , 13-2,
13-3, 13-4, 13-5, 13-6: thermal conductive materials 14-1, 14-2, 14-3, 14-4, 14-5 Piezoelectric
ceramic 15-1, 15-2, 15-3, 15-4, 15-5: Driving electrode layer 16-1, 16-2, 16-3, 16-4, 16-5, 16-6 ,
16-7, 16-8, 16-9, 16-10, 16-11, 16-12, 16-13, 16-14, 16-15, 16-16, 16-17: Vibrating film 17-1 ,
17-2, 17-3, 17-4, 17-5, 17-6, 17-7, 17-8: Supports 100-1, 100-2: Installation place of the
electroacoustic transducer
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