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DESCRIPTION JPH05268697

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DESCRIPTION JPH05268697
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
telephone set (hereinafter referred to as a radio telephone set) configured to transmit and receive
voice by radio communication with the handset and the telephone set being separated and
independent. More specifically, an electronic circuit function incorporated in the handset of the
wireless telephone is provided, in which the piezoelectric sounding body is incorporated in the
transmitter unit or the receiver unit of the second embodiment and configured to perform
conversion between an audio signal and a voltage value. The present invention relates to a novel
piezoelectric sounding body in which the life of the device is extended by protecting the electric
discharge phenomenon due to static electricity or the like.
[0002]
2. Description of the Related Art Reflecting the recent advanced information age, various
communication means have been diversifying, and in particular, telephones having various
functions have been developed, especially indoors etc. So that there is no limitation on the call
location in the country, the demand for a so-called cordless telephone, in which the transceiver
unit and the telephone main body are separated and independent and configured to transmit and
receive voice by wireless communication, is expanding. There is.
[0003]
In the above-mentioned radiotelephone, an electronic circuit function for converting voice into a
radio signal, a power supply unit, etc. are built in the handset as compared with one in which the
handset and the telephone main body are connected by the connection line. , It is necessary to
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configure the handset body to be small and thin.
[0004]
In order to cope with this, instead of the electromagnetic speaker utilizing the electromagnetic
action, a piezoelectric element utilizing the piezoelectric effect capable of making the
transmitting part and the receiving part of the handset small and thin in shape is used. There is.
[0005]
A conventional piezoelectric speaker to which the piezoelectric element is applied will be
described with reference to FIG.
[0006]
The piezoelectric element 21 having an electrostrictive effect that produces a piezoelectric effect
or an electrical stress that generates an electrostatic charge at its end face when a pressure or
tension is applied to a ferroelectric or the like generates an electrostatic charge on its end face is
PZT (zirconate titanate). It is formed in the shape of a thin disk made of a ferroelectric ceramic
such as lead acid) porcelain.
[0007]
On both main surfaces of the piezoelectric element 21, for example, an electrode having good
electrical conductivity such as silver is formed in a thin film form.
[0008]
The piezoelectric element 21 on which the electrodes are formed is made of brass or the like and
has a diameter larger than that of the piezoelectric element 21 and is one of the electrodes on
the diaphragm main surface 22a of the diaphragm 22 formed in a thin disk shape. The
piezoelectric element 20 is configured by being interposed and fixed.
[0009]
At this time, although not shown, insulation for performing exchange of electrical signals with
the outside at one end of the other electrode attached to the piezoelectric element 21 in the
piezoelectric element 20 and one end of the diaphragm 22. It is assumed that the coated
conductive wire is fixed by soldering and is derived from the storage case 11 which is a housing
base of the piezoelectric element 20.
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[0010]
The storage case 11 is made of a synthetic resin or the like, and has a side wall having an annular
or polygonal shape, a storage opening 12 of which one is entirely open, and an opening relative
wall 19 opposed to the storage opening 12. By having it, the cross section is processed and
formed into a substantially concave shape.
[0011]
A sound emitting hole 13 is opened substantially at the center of the opening relative wall 19,
and the sound pressure adjusting film 18 formed in a mesh shape is covered with the sound
emitting hole 13 inside the storage case 11. Further, by adhering with an adhesive or the like, the
sound pressure to the piezoelectric vibration of the piezoelectric element 20 can be adjusted.
[0012]
A mounting step 14 is provided substantially at the center of the inner wall surface of the storage
case 11 along the entire inner surface, and the piezoelectric element 20 is an opening relative
wall 19 in the present embodiment. It is stored in the storage case 11 via the storage opening 12
so as to face the side, and the diaphragm peripheral portion 22b of the piezoelectric element 20
is abutted in the mounting step portion 14, and further, for example, a silicone type It is fixed by
the sealing adhesive 16 of
[0013]
At this time, since the diaphragm peripheral portion 22b of the piezoelectric element 20 is
coated by the sealing adhesive 16 over the entire circumference of the mounting step portion 14
of the storage case 11, the storage opening 12 are closed off at the mounting step 14.
[0014]
Next, a state where the piezoelectric sounding body 10 configured as described above is attached
to the handset main body 30 in the wireless telephone will be described.
[0015]
In FIG. 3, the handset main body 30 shows a mouthpiece or earpiece that is a main part of the
present invention, and this part is a mounting base 31 to which the piezoelectric sounding body
10 is attached. .
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[0016]
In the mounting base 31, sound through holes 32, 32 ',... For passing a transmitting sound or a
receiving sound are opened.
[0017]
Further, on the mounting surface 34 of the mounting base 31, an annular fitting projection 33 is
provided in a protruding manner in accordance with the shape of the case mounting end 15 on
the storage opening 12 side of the piezoelectric sounding body 10. .
[0018]
In this state, the case mounting end 15 of the piezoelectric sounding body 10 is fitted to the
fitting projection 33 on the mounting surface 34 and bonded and fixed, whereby the
piezoelectric sounding body 10 is mounted on the mounting base It is mounted on 31.
[0019]
However, according to the above-mentioned conventional piezoelectric sounding body, since the
handset body is configured to be freely carried, a means for electrical grounding is provided. In
particular, discharge occurs between the static electricity generated from the user's clothes etc.
in the winter season etc. and the diaphragm of the piezoelectric element housed and fixed in the
housing case of the piezoelectric sounding body, and the discharge phenomenon produces
piezoelectricity. There is a problem that an electronic circuit or the like having a function of
transmission or the like connected to the element is broken.
[0020]
Further, even if an insulating agent such as an epoxy paint is applied to the diaphragm of the
piezoelectric element, the film thickness required for the application becomes thick, adversely
affecting the piezoelectric acoustic conversion of the piezoelectric element, and limiting the
insulating ability per thickness. And there is a problem that it can not withstand the discharge
phenomenon due to the static electricity or the like.
[0021]
The present invention has been made in view of the above circumstances, and is an electronic
circuit having a function such as transmission and reception of a radio signal connected to a
piezoelectric element by a discharge phenomenon caused by the static electricity or the like
without impairing sound pressure characteristics. It is an object of the present invention to
provide a piezoelectric sounding body configured to protect that etc. from being destroyed.
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[0022]
According to the present invention, according to the present invention, there is provided a
storage case having one end fully opened, and a piezoelectric element fixed to one main surface
of a diaphragm and the other main surface of the diaphragm is the opening side. And a
piezoelectric element having a piezoelectric element whose peripheral portion is fixed to the
inside of the storage case so as to be exposed to the inside of the storage case, the insulating
sheet being stored inside the storage case so as not to contact the diaphragm. By providing a
piezoelectric sounding body configured to fix the periphery of the insulating sheet to the opening
end face of the storage case, there is provided a piezoelectric sounding body characterized in that
the insulating sheet is attached to the opening end face of the storage case. By doing this, the
above-mentioned object is achieved.
[0023]
In the present invention, the piezoelectric sounding body has the configuration in which the
insulating sheet is housed inside the housing case so as not to contact the diaphragm and the
peripheral portion of the insulating sheet is fixed to the opening end face of the housing case.
The insulating sheet can prevent the occurrence of a discharge phenomenon between the
external environment in which static electricity is stored and the diaphragm of the piezoelectric
element.
[0024]
Further, since the diaphragm and the insulating sheet surface in the piezoelectric element are not
in contact with each other, the insulating sheet has no influence on the piezoelectric vibration of
the piezoelectric element, and the sound pressure characteristics are not impaired.
[0025]
Embodiments of the invention will be described in detail with reference to the drawings.
[0026]
FIG. 1 is a sectional view showing an embodiment of a piezoelectric sounding body according to
claim 1 of the present invention.
[0027]
In FIG. 1, in the piezoelectric sounding body 50, the piezoelectric element 61 is fixed to a storage
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case main body 51 having a storage opening 52 one end of which is fully opened and a
piezoelectric element attachment surface 65 which is one main surface of the diaphragm 62. And
a piezoelectric element 60 having a peripheral portion 67 of the diaphragm 62 fixed inside the
storage case main body 51 so that the other principal surface 68 of the diaphragm 62 is exposed
to the opening side, The insulating sheet 72 is housed inside the housing case so as not to
contact the diaphragm 62 and the insulating sheet peripheral portion 73 is fixed to the housing
case opening end face 69.
[0028]
The main members of the piezoelectric speaker 50 will be described in detail below.
[0029]
The piezoelectric element 61 has a piezoelectric effect that generates polarization when a
pressure or tension is applied to a ferroelectric or the like to generate an electrostatic charge at
the end face or an electrostrictive effect that generates a mechanical stress when an electric field
is applied. It is formed in the shape of a thin disc made of ferroelectric ceramics such as lead
zirconate porcelain.
[0030]
On both main surfaces of the piezoelectric element 61, for example, a first electrode 63 and a
second electrode 64 having good electrical conductivity such as silver are formed in a thin film
form.
[0031]
The piezoelectric element 61 on which the electrodes are formed is made of brass or the like and
has a diameter larger than that of the piezoelectric element 61 and is formed on the piezoelectric
element attachment surface 65 of the diaphragm 62 formed in a thin disk shape. It is fixed via an
electrode 63 and constitutes a piezoelectric element 60 together with the diaphragm 62.
[0032]
The insulating sheet 72 is generally made of polyethylene terephthalate having excellent heat
resistance and insulation properties, which is used as a base film material such as a magnetic
tape or a photographic film.
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The thickness of the insulating sheet 72 is preferably 5 to 50 μm.
Further, the shape of the insulating sheet 72 is bent from the storage case opening end face 69
fixed as shown in FIG. 1 to the inner side of the case and held at a constant distance from the
diaphragm 62, in other words, a plate Or the tray is shaped like a face down.
[0033]
Further, although not shown, insulation for performing exchange of electrical signals with the
outside at one end of the second electrode 64 and one end of the diaphragm 62 attached to the
piezoelectric element 61 in the piezoelectric element 60. It is assumed that the coated conductive
wire is fixed by soldering and is led out from a storage case 51 which is a housing base of the
piezoelectric element 60.
[0034]
Next, the storage case 51 is made of a synthetic resin or the like, and has an annular or polygonal
side wall, a storage opening 52 one of which is fully open, and an opening relative wall 59 facing
the storage opening 52. , And the cross section is formed into a substantially concave shape.
[0035]
A sound emitting hole 53 is opened substantially at the center of the opening relative wall 59,
and a sound pressure adjusting film 58 formed in a mesh shape is covered with the sound
emitting hole 53 inside the storage case 51. Further, by being fixed by an adhesive, the sound
pressure to the piezoelectric vibration of the piezoelectric element 60 can be adjusted.
[0036]
A mounting step 54 is formed substantially at the center of the inner wall surface of the storage
case 51 along the entire inner surface, and the mounting surface of the piezoelectric element 60
of the piezoelectric element 60 is attached to the mounting step 54. A diaphragm main surface
68 opposite to the above is fixed by, for example, a silicone-based sealing adhesive 56 so as to be
exposed to the storage opening 52 side.
[0037]
Next, a state where the piezoelectric sounding body 50 configured as described above is attached
to the handset main body 80 in the wireless telephone will be described.
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[0038]
In FIG. 1, the handset main body 80 shows a mouthpiece or earpiece that is a main part of the
present invention, and this part is a mounting base 81 to which the piezoelectric sounding body
50 is attached. .
[0039]
In the mounting base 81, sound through holes 82, 82 ', ... for passing a transmitting sound or a
receiving sound are opened.
[0040]
Further, on the mounting surface 84 of the mounting base 81, an annular fitting projection 83 is
provided in a protruding manner corresponding to the shape of the case mounting end 55 on the
storage opening 12 side of the piezoelectric sounding body 50. .
[0041]
In this state, the case mounting end 55 of the piezoelectric sounding body 50 is fitted to the
fitting projection 83 on the mounting surface 84 and bonded and fixed, whereby the
piezoelectric sounding body 50 is mounted on the mounting base It is mounted on the 81.
[0042]
According to the piezoelectric sounding body 50 configured as described above, the insulating
sheet 72 prevents the discharge phenomenon generated between the external environment in
which static electricity is stored and the diaphragm 62 of the piezoelectric element 60. it can.
[0043]
Further, since the insulating sheet 72 is extremely thin and not in contact with the diaphragm 62,
it does not affect the piezoelectric vibration of the piezoelectric element 60.
[0044]
Next, an embodiment according to claim 2 of the present invention will be described based on
the drawings.
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In the present embodiment, the same parts as those of the embodiment according to the first
aspect of the present invention will not be described, and the same members will be illustrated
with the same reference numerals.
[0045]
FIG. 2 is a cross-sectional view showing an embodiment of a small-sized piezoelectric speaker
according to claim 2 of the present invention.
[0046]
In FIG. 2, in the piezoelectric sounding body 90, the piezoelectric element 61 is fixed to a storage
case main body 51 having a storage opening 52 one end of which is fully open and a
piezoelectric element attachment surface 65 which is one main surface of the diaphragm 62. And
a piezoelectric element 60 having a peripheral portion 67 of the diaphragm 62 fixed inside the
storage case main body 51 so that the other principal surface 68 of the diaphragm 62 is exposed
to the opening side, In addition, the insulating sheet 72 is tensioned on the storage case opening
end face 69.
[0047]
Although the insulating sheet 72 and the storage case opening end face 69 are attached by an
adhesive, the insulating sheet 72 should be attached so as not to relax and come into contact
with the diaphragm 62.
[0048]
Next, a state where the piezoelectric sounding body 90 configured as described above is attached
to the handset main body 80 in the wireless telephone will be described.
[0049]
Since the piezoelectric sounding body 90 according to the present invention has a structure in
which the insulating sheet 72 is attached to the opening end face 69 of the storage case as
described above, the piezoelectric sounding body 90 is insulated on the mounting surface 84 of
the mounting base 81 when directly attached to the handset body 80. The sheet 72 contacts the
entire surface, absorbs the sound pressure, and affects the sound pressure characteristics of the
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piezoelectric sounding body 90.
Therefore, in order to prevent the contact, the rubber packing 91 is narrowly mounted between
the storage case opening end face 69 of the piezoelectric sounding body 90 and the mounting
base 81, and the insulating sheet 72 is formed by the thickness of the rubber packing 91. And
the mounting base 81 are maintained.
[0050]
According to the inventor's experiments, in the electrostatic pressure resistance test, a charge
probe charged with a measurement voltage to a capacitance of 250 pF is discharged through the
500 Ω discharge resistor, and the sound emission hole on the front surface of the piezoelectric
sounding body which is a sample In the case of the test method in which the piezoelectric
sounding body 50, 90 according to the present invention is applied by 15 kV, there is no effect
even if 15 kV is applied, and the result is that spark discharge occurs at 7 kV in the conventional
piezoelectric sounding body 10. It was done.
[0051]
The piezoelectric speaker according to the present invention is configured as described above,
and therefore has the following effects.
[0052]
(1) In the present invention, the insulating sheet disposed in the piezoelectric sounding body
prevents the discharge phenomenon generated between the external environment where static
electricity is stored and the diaphragm of the piezoelectric element, and It has the excellent effect
of being able to realize the reliability and the long life of the handset body by protecting the
electronic circuit etc. having the function of transmitting and receiving wireless signals.
[0053]
(2) Since the insulating sheet is not in contact with the diaphragm in the piezoelectric element,
the effect of the piezoelectric element on the piezoelectric vibration can be eliminated, and the
sound pressure characteristics of the handset can be prevented from being deteriorated. Have.
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