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JP2017092547

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DESCRIPTION JP2017092547
An object of the present invention is to provide a piezoelectric vibrator and a diaphragm outside
of a case to realize sound generation with the same timbre as on land without being affected by
water pressure even in water. The present invention relates to a piezoelectric speaker 1 disposed
in a housing, which includes a piezoelectric vibrating body 3, a vibrating plate 2 which receives
the vibration of the piezoelectric vibrating body 3, a piezoelectric vibrating body 3 and a
vibrating plate 2. A holder 7 as a holding member to be disposed, and shafts 5a and 5b as a
current-carrying member whose part is inserted through the holding member, and the
piezoelectric vibrator 3 is electrically connected to the current-carrying member 2 The
piezoelectric vibrator 3, the diaphragm 2 and the holding member are disposed outside the
housing. [Selected figure] Figure 1
Piezoelectric speaker and sound generator using the same
[0001]
The present invention relates to a piezoelectric speaker that realizes sound generation with the
same timbre as in land even in water, and a sound generator using the same.
[0002]
Conventionally, marine sports such as scuba diving have been established as one of leisure
activities, but various devices have been proposed to support underwater activities.
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One of such activities in the water is communication within the group, but since it is difficult to
generate sound similar to onshore under the influence of water pressure in the water, mainly
lights, underwater bells, hands A signal determined in advance by a sign or the like is sent, and
integration of actions within the group is attempted by the signal. If such signals can be sent by
sound, it is hoped that this will be possible because it can support more diverse actions in water.
[0003]
Here, for example, Patent Document 1 discloses an underwater diver's underwater
communication device. More specifically, this device is provided with an elastically deformable
support plate that forms an enclosed space with the acoustic diaphragm and supports the
electrical signal-mechanical vibration signal converter in the sealed container, and And convey a
tone representing information.
[0004]
Unexamined-Japanese-Patent No. 11-113082
[0005]
However, in the underwater communication device for divers according to Patent Document 1,
part of the sound generated from the sound generation unit is sealed since the sound generation
unit such as the acoustic diaphragm and the support plate is housed inside the sealed container.
It was absorbed by the container or attenuated by the container wall in the sealed container, and
a sufficient sound output could not be obtained.
[0006]
In addition, the speaker according to the prior art is affected by water pressure in water and can
not generate sound with the same timbre as on land, but the speaker and the sound generating
device that can solve this problem are still Not realized.
[0007]
The present invention has been made in view of such problems, and by disposing the
piezoelectric vibrator and the diaphragm outside the casing, the same timbre as on the ground
without being affected by water pressure even in water. It is an object of the present invention to
provide an underwater piezoelectric speaker and an acoustic generator using the same, which
realizes the acoustic generation of the above.
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[0008]
In order to solve the above-mentioned subject, the piezoelectric speaker concerning the 1st mode
of the present invention is a piezoelectric speaker for water provided in a case, and the vibration
which receives the vibration of a piezoelectric vibrator and the above-mentioned piezoelectric
vibrator A plate, a holding member on which the piezoelectric element and the vibration plate are
disposed, and a current-carrying member whose part is inserted through the holding member,
and the piezoelectric vibrator is electrically connected to the current-carrying member The
piezoelectric vibrator, the diaphragm and the holding member are disposed outside the housing.
[0009]
In the piezoelectric speaker according to a second aspect of the present invention, in the first
aspect, the piezoelectric vibrator and the diaphragm are water-resistant coated in a state of being
disposed on the holding member.
[0010]
A sound generator according to a third aspect of the present invention is a sound generator used
in water, and includes a piezoelectric vibrator, a vibrating plate which receives the vibration of
the piezoelectric vibrator, the piezoelectric vibrator and the vibrating plate. , A holding member
on which the power supply member is disposed, a conducting member whose part is inserted
through the holding member, a power supply for applying a voltage to the piezoelectric vibrator
via the conducting member, and a control for controlling the conduction from the power supply
The piezoelectric vibrator is electrically connected to the conductive member, and the
piezoelectric vibrator, the diaphragm, and the holding member are provided. It is arrange ¦
positioned by the exterior of the said housing ¦ casing.
[0011]
The sound generator according to a fourth aspect of the present invention further comprises, in
the third aspect, a horn member disposed on the front surface of the piezoelectric vibrator.
[0012]
The sound generator according to a fifth aspect of the present invention further comprises, in the
fourth aspect, a protective cover disposed on the front surface of the horn member.
[0013]
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The sound generator according to a sixth aspect of the present invention further includes, in the
fourth aspect, a light emitting unit that emits light.
[0014]
The sound generator according to a seventh aspect of the present invention is, in the fourth
aspect, provided with a band portion in the housing, and is in a wristwatch type by the housing
and the band portion.
[0015]
According to the present invention, by arranging the piezoelectric vibrator and the diaphragm
outside the housing, sound generation with a tone similar to that on land without being affected
by water pressure even in water, and a piezoelectric speaker, An acoustic generator using the
same can be provided.
[0016]
It is a block diagram of the piezoelectric speaker which concerns on 1st Embodiment of this
invention.
(A), (b) is a block diagram of the sound generator which concerns on 2nd Embodiment of this
invention.
FIG. 6 is a functional block diagram of a control system used in the first to fourth embodiments.
(A), (b) is a block diagram of the sound generator which concerns on 3rd Embodiment of this
invention.
(A), (b) is a block diagram of the sound generator which concerns on 4th Embodiment of this
invention.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to the
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drawings.
[0018]
First Embodiment
[0019]
The configuration of a piezoelectric speaker according to a first embodiment of the present
invention is shown in FIG. 1 and described.
More specifically, FIG. 1A shows a plan view of the piezoelectric speaker, and FIG. 1B shows a
side cross-sectional view of the piezoelectric speaker.
[0020]
As shown in the figure, the piezoelectric speaker 1 comprises a circular diaphragm 2 and a
circular piezoelectric vibrator 3 having a radius smaller than the radius of the diaphragm 2
disposed at the center of the diaphragm 2. Is equipped.
The diaphragm 2 and the piezoelectric vibrator 3 are disposed in a holder 7 as a holding
member, and a part of the shafts 5a and 5b as current-carrying members is inserted into the
holder 7.
An elastic adhesive 8 intervenes in the connection surface between the holder 7 and the shafts
5a and 5b, thereby making the connection of the two strong and enhancing the waterproof
function.
The electrodes 4a and 4b to which the piezoelectric vibrator 3 is electrically connected are
provided on the diaphragm 2, and the diaphragm 2 is provided via shafts 5a and 5b as currentcarrying members and lead wires 6a and 6b. It is electrically connected by soldering or the like.
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A conductive adhesive may be used for this connection.
After this electrical connection is made, the entire surface of the holders 5a, 5b is coated with a
water resistant coating.
The diaphragm 2 and the piezoelectric vibrator 3 are not limited to the circular shape, but may
be in various shapes such as a triangle, a quadrangle, and a rhombus.
[0021]
The shafts 5a and 5b as the current-carrying members are fixed to the housing 9 using the Orings 10a and 10b, and in order to prevent the displacement of the diaphragm 2 and the
piezoelectric vibrator 3 in the vertical direction, It fixes from the inner surface side of the housing
¦ casing 9 by E ring 11a, 11b.
The O-rings 10a and 10b prevent water from entering the housing 9.
The shafts 5a and 5b function as current-carrying members in the sense that they have electrical
contacts between the electrical contacts with the electrodes 4a and 4b and the power supply (not
shown), but the outer surfaces thereof are coated with an insulating material. .
[0022]
In such a configuration, in the piezoelectric speaker 1 according to the first embodiment, the
diaphragm 2 and the piezoelectric vibrator 3 are disposed in the holder 7 as the holding member,
and they are disposed outside the housing 9. It is characterized by
Even when the diaphragm 2 and the piezoelectric vibrator 3 are thus provided outside the
housing 9 according to an experiment by the applicant, the whole of the portion exposed to the
outside of the housing 9 is water-resistant coated, thereby inhibiting the current-carrying
relationship. It has been confirmed that sound generation with the same timbre as on land is
realized. At the time of actual sound generation, it is added to the piezoelectric vibrator 3 from
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the power supply (not shown) via the shafts 5a and 5b as electrodes and the electrodes 4a and
4b as a conducting member, whereby the piezoelectric vibrator 3 vibrates and the vibration is
generated It is transmitted to the diaphragm 2 to generate sound with a predetermined tone.
[0023]
As described above, according to the piezoelectric speaker according to the first embodiment of
the present invention, sound generation with the same timbre as on land is realized without
being affected by water pressure.
[0024]
Second Embodiment
[0025]
2 (a) and 2 (b) show the configuration of the sound generating apparatus according to the second
embodiment of the present invention and will be described.
More specifically, FIG. 2 (a) is a plan view seen from the protective cover side, and FIG. 2 (b) is a
side sectional view.
This uses the piezoelectric speaker according to the first embodiment.
[0026]
As shown in the figure, the sound generating device 21 includes a circular diaphragm 22 and a
circular piezoelectric vibrator 23 having a radius smaller than the radius of the diaphragm 22
disposed at the center of the diaphragm 22. And have. The diaphragm 22 and the piezoelectric
vibrator 23 are disposed in a holder 27 as a holding member, and a part of the shafts 25 a and
25 b as current-carrying members is inserted into the holder 27. An elastic adhesive 28
intervenes in the connecting surface between the holder 27 and the shafts 25a and 25b, thereby
making the connection of the two strong and enhancing the waterproof function.
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[0027]
The electrodes 24a and 24b to which the piezoelectric vibrator 23 is electrically connected are
provided on the diaphragm 22. The diaphragm 22 is connected to shafts 25a and 25b as currentcarrying members and lead wires (not shown). It is electrically connected by soldering or the like.
A conductive adhesive may be used for this connection. After this electrical connection is made,
the entire surface of the holders 25a, 25b is coated with a water resistant coating.
[0028]
The shafts 25a and 25b as current-carrying members are fixed to the housing 29 using the Orings 30a and 30b, and in order to prevent the displacement of the diaphragm 22 and the
piezoelectric vibrator 23 in the vertical direction, It fixes from the inner surface side of the
housing ¦ casing 29 by E ring 31a, 31b. The O-rings 30a and 30b prevent water from entering
the housing 29.
[0029]
The shafts 25a and 25b function as current-carrying members in the sense that they have
electrical contacts with the electrical contacts with the electrodes 24a and 24b and a power
supply (not shown), but the outer surfaces thereof are coated with insulation. .
[0030]
A battery 26 is provided to be electrically connected to the contacts of the shafts 25a and 25b as
current-carrying members, and a control board 32 for controlling the energization from the
battery 26 and operation buttons 33 and 34 are provided in the housing 29. Is provided.
The operation button 33 is for power on / off control, and the operation button 34 is for
changing the tone.
[0031]
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A horn member 35 is provided on the front surface of the piezoelectric speaker having the
diaphragm 22 and the piezoelectric vibrator 23. This ensures directivity. Further, the protective
cover 36 is fitted to the housing 29 by the O-ring 37 and mounted. The protective cover 36
covers the piezoelectric speaker in a state where the horn member 35 is mounted, and a large
number of holes 36 a suitable for generating a sound are opened in the plane.
[0032]
In such a configuration, the sound generation device 21 according to the second embodiment has
the diaphragm 22 and the piezoelectric vibrator 23 disposed in the holder 27 as a holding
member, which are disposed outside the housing 29. It is characterized by As a result of
experiments conducted by the applicant, even when the diaphragm 22 and the piezoelectric
vibrator 23 are thus provided outside the housing 29, water resistance coating is also inhibited
by waterproofing the entire part exposed to the outside of the housing 29. As described above, it
was confirmed that sound generation with the same timbre as on land was realized. At the time
of actual sound generation, it is added to the piezoelectric vibrator 23 from the battery 26 as a
power source through the shafts 25a and 25b as electrodes and electrodes 24a and 24b, thereby
vibrating the piezoelectric vibrator 23 and the vibration Is transmitted to the diaphragm 22 to
generate sound with a predetermined tone. At this time, the directivity of the sound is secured by
the horn member 35 disposed on the front surface of the piezoelectric speaker.
[0033]
Here, FIG. 3 shows a functional block diagram of a control system related to audio output, and
this will be described.
[0034]
As shown in the figure, the audio output circuit includes a sound source 100, a sound source
switching unit 101, an amplification unit (AMP) 102, a PWM conversion unit 103, and a boosting
unit 104.
Each part is supplied with power from a battery 26 as a power supply.
[0035]
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In such a configuration, the sound source switching unit 101 switches to the sound source 100
of a predetermined tone based on the operation of the operation switch, and the amplifying unit
102 amplifies the audio signal obtained from the sound source, and the PWM converter 103
amplifies the audio signal. The signal is converted into a signal of PWM format, and the voltage
boosting unit 104 boosts the PWM signal to a voltage suitable for the characteristics of the
piezoelectric vibrator 23 and outputs the voltage to the piezoelectric vibrator 23. At this time, the
low frequency component may be removed by a high pass filter and then output to the
piezoelectric vibrator 23.
[0036]
As described above, according to the sound generation device of the second embodiment of the
present invention, in addition to the effects of the first embodiment, the directivity of sound is
ensured by the horn member.
[0037]
Third Embodiment
[0038]
4 (a) and 4 (b) show the configuration of the sound generation apparatus according to the third
embodiment of the present invention and will be described.
More specifically, FIG. 4 (a) is a plan view seen from the protective cover side of the light portion,
and FIG. 4 (b) is a side sectional view.
This uses the piezoelectric speaker according to the first embodiment, and adds an illumination
function to the sound generator according to the second embodiment. In the following, the same
components as those of the second embodiment are denoted by the same reference numerals,
and different components will be mainly described.
[0039]
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As shown in the figure, in the sound generating device 41, the configuration of the piezoelectric
speaker unit 42 is the same as that of the second embodiment. In the sound generator 41 of the
third embodiment, the light unit 43 is further added. In the light portion 43, a control substrate
44 which controls light emission of light is disposed, and the control substrate 44 receives
current from the battery 26. Further, on the installation surface 45, an LED 46 as a light emitting
means and a lens 47 for focusing are provided. Although three LEDs 46 and condenser lenses 47
are provided in this example, the number is not limited to this.
[0040]
A front glass 48 is provided on the light path of the light from the LED 46 and the condenser lens
47, and a protective cover 49 is attached to the housing 29 so as to cover the entire light portion
43 including the front glass 48. There is. The protective cover 49 ensures the waterproofness of
the light portion 43. Along with the addition of the light portion 43, operation switches 50 and
51 are further provided. The operation switch 50 is a light adjustment switch, and the operation
switch 51 switches between light emission from the light unit 43 and sound generation from the
piezoelectric speaker unit 42.
[0041]
The functional block diagram of the control system is the same as that of the second
embodiment.
[0042]
As described above, according to the first embodiment of the present invention, in addition to the
effects of the second embodiment described above, it is possible to emit light that is further
dimmed.
[0043]
Fourth Embodiment
[0044]
The structure of the sound generation apparatus which concerns on FIG. 5 (a) and FIG.5 (b)
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concerning 4th Embodiment of this invention is shown and demonstrated.
More specifically, FIG. 5 (a) is a plan view seen from the protective cover side, and FIG. 5 (b) is a
side sectional view.
This is a sound generator using a piezoelectric speaker according to the first embodiment and
having a case shaped like a wristwatch.
[0045]
As shown in the figure, the sound generating device 61 includes a circular diaphragm 62 and a
circular piezoelectric vibrator 63 having a radius smaller than the radius of the diaphragm 62
disposed at the center of the diaphragm 62. And have.
The vibrating plate 62 and the piezoelectric vibrating body 63 are disposed in a holder 67 as a
holding member, and a part of shafts 65 a and 65 b as current-carrying members is inserted into
the holder 67. An elastic adhesive 68 intervenes in the connecting surface between the holder 67
and the shafts 65a and 65b, thereby making the connection of the both strong and enhancing the
waterproof function.
[0046]
The electrodes 64a and 64b to which the piezoelectric vibrator 63 is electrically connected are
provided on the diaphragm 62, and the diaphragm 62 is connected to shafts 65a and 65b as
current-carrying members and lead wires (not shown). It is electrically connected by soldering or
the like. A conductive adhesive may be used for this connection. After the electrical connection is
made, the entire surface of the holders 65a and 65b is coated with a water resistant coating.
[0047]
The shafts 65a and 65b as current-carrying members are fixed to the housing 69 using the Orings 70a and 70b, and to prevent the vibration plate 62 and the piezoelectric vibrating member
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63 from being vertically displaced, It fixes from the inner surface side of the housing ¦ casing 69
by E ring 71a, 71b. The O-rings 70a and 70b prevent water from entering the housing 29. In this
example, the protective cover 77 is attached to the holder 67. The protective cover 77 is
provided with a number of elongated holes, but the shape is not limited thereto. The housing 69
is provided with belt portions 78a and 78b, whereby a watch-like shape is realized.
[0048]
The shafts 65a and 65b function as current-carrying members in the sense that they have
electrical contacts with the electrical contacts with the electrodes 64a and 64b and a power
supply (not shown), but the outer surfaces thereof are coated with insulation .
[0049]
A battery 66 is provided to be electrically connected to the contacts of the shafts 65a and 65b as
current-carrying members, and a control board 72 for controlling the energization from the
battery 66 and operation buttons 73 to 76 are further provided in the housing 69. Is provided.
The operation button 73 is for power on / off control, and the operation button 74 is for
changing the tone. The operation button 75 is for light control of light emission by the light unit
(not shown), and the operation button 76 is for switching between light emission and sound
generation by the light unit (not shown).
[0050]
In such a configuration, the sound generation device 61 according to the second embodiment
arranges the vibration plate 62 and the piezoelectric vibration member 63 in the holder 67 as a
holding member, and arranges them outside the housing 69. It is characterized by Even in the
case where the diaphragm 62 and the piezoelectric vibrator 63 are thus provided outside the
housing 69 according to an experiment by the applicant, the whole of the portion exposed to the
outside of the housing 69 is water-resistant coated, thereby inhibiting the current-carrying
relationship. As described above, it was confirmed that sound generation with the same timbre as
on land was realized. At the time of actual sound generation, it is added to the piezoelectric
vibrating body 63 from the battery 66 as a power source via the shafts 65a and 65b as
electrodes and electrodes 64a and 64b, whereby the piezoelectric vibrating body 63 vibrates and
the vibration thereof Is transmitted to the diaphragm 62 to generate sound with a predetermined
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tone.
[0051]
The functional block diagram of the control system is the same as that of the second
embodiment.
[0052]
As described above, according to the fourth embodiment of the present invention, portability and
operability of the user can be further improved by reducing the size and weight as compared
with the second embodiment.
[0053]
As mentioned above, although one embodiment of the present invention was described, it is
needless to say that the present invention is not limited to this, and various improvement and
change are possible in the range which does not deviate from the meaning.
[0054]
For example, although various coating agents using an elastic material can be used for the waterresistant coating, the present invention is not limited thereto, and various materials may be used
as long as they do not inhibit the transmission of vibration from the piezoelectric vibrator to the
diaphragm. be able to.
[0055]
Further, in the above embodiment, although the example in which the piezoelectric vibrating
body is disposed at the central portion of the diaphragm is described, without being limited
thereto, for example, a doughnut-shaped piezoelectric vibrating body in which the central portion
is opened As a matter of course, it may be provided to cover the outer periphery of the
diaphragm.
[0056]
DESCRIPTION OF SYMBOLS 1 ... Piezoelectric speaker, 2 ... Diaphragm, 3 ... Piezoelectric vibrator,
4a, 4b ... Electrode, 5a, 5b ... Shaft, 6a, 6b ... Lead wire, 7 ... Holder, 8 ... Elastic adhesive, 9 ...
Housing ¦ casing, DESCRIPTION OF SYMBOLS 10a, 10b ... O ring, 11a, 11b ... E ring, 21 ... Sound
generator, 22 ... Vibration board, 23 ... Piezoelectric vibrator, 24a, 24b ... Electrode, 25a, 25b ...
Shaft, 26 ... Battery, 27 ... Holder , 28: elastic adhesive, 29: housing, 30a, 30b, ... O ring, 31a, 31b,
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... E ring, 32 ... control board, 33 ... operation button, 34 ... operation button, 35 ... horn member,
36 ... protective cover , 36a: hole, 41: sound generator, 42: piezoelectric speaker portion, 43: light
portion, 44: control substrate, 45: installation surface, 46: LED, 47: lens for focusing, 48: front
glass, 49 …protection Bar, 50: operation switch, 51: operation switch, 61: sound generator, 62:
diaphragm, 63: piezoelectric vibrator, 64a, 64b: electrode, 65a, 65b: shaft, 66: battery, 67:
holder, 68 ... elastic adhesive, 69 ... housing, 70a, 70b ... O-ring, 71a, 71b ... E-ring, 72 ... control
board, 73-76 ... operation button, 77 ... protective cover, 78a, 78b ... belt portion.
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