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1 、 Name of invention
Electro-mechanical conversion element
3. Detailed Description of the Invention The present invention relates to the construction of an
electro-mechanical transducer element using a polymer sheet. It is known that when polyvinyl
chloride, polyvinyl fluoride, polyvinylidene fluoride, and other polar polymer materials are
polarized under direct current and high voltage, they become piezoelectric materials. As the
characteristics of the polymer material, it is possible to form a film having an extremely thin
thickness and a large area, 6 itself becoming a vibrating film. On the other hand, when the royal
sheet is applied with an electric field between both sides of the sheet, it causes expansion or
contraction, and conversely, when the sheet is expanded or contracted, an electric field is
generated between the both sides. The polymer piezoelectric sheet has both the characteristics
suitable for such a vibrating membrane and the properties as an electro-mechanical mutual
change element, and directly changes the vibration of the vibrating membrane into a spirit, and
vice versa. Since it is possible to convert .phi. Into .phi. 'Directly to the membrane vibration, it is
useful as an acoustic fixture such as a telephone, a microphone, and a speaker. However, even
with an element having such excellent performance, there are various problems with Fi variously.
That is, as an element for transmitting sound, it is required that the vibrating film be as thin as
possible and the mass be small. Therefore, it is preferable to use electrode plating or vapor
deposition on both sides of the vibrating film. Also, when the vibrating film of this piezoelectric
body is embedded in an acoustic device such as a microphone or a speaker, it is necessary to fix
at least a part of the peripheral portion (at least a part using a flange etc. EndPage: 1, which is
used for stretching and shrinking of the film, is 11th. In addition to the weakening of the
adhesive force due to the difference of the elongation with the electrode, 1 the electrode around
the flange is easy to peel off due to the friction at the flange due to the vibration. There is a
drawback that the life of the device is shortened. When using Matakkono polymer piezoelectric
sheet as an electrical → mechanical conversion element, especially for speakers, 5 heads and
handsets, etc. 41 The sheet is stretched in a flat shape and stone and negative are both sides of
this sheet Even if the voice sentence i is operated, the sheet mainly expands and contracts in a
plane, and the surface vibration of the sheet] hardly appears as 0, so it is necessary to bend and
stretch the sheet. It is difficult to bend and stretch thin sheets of the order of microns without a
support. Further, even in the case of stretching using a support, when the sheet is curved, it is
stretched in many cases with a natural curvature of 15 and is therefore preferable in many cases.
The present invention is proposed to solve the above problems. The feature of the wood type is
that the thin film electrodes are attached to both sides of the sheet-like high-density 20-pole
piezoelectric body in which at least a part of the central part of the piezoelectric element is
thinner than the peripheral part.
A second aspect of the present invention is that the piezoelectric element having a thin central
portion as described above is a curved sheet. Examples of the present invention will be described
below. 5 In FIG. 1, (1) is, for example, poly (vinyl fluoride) 5 and the peripheral portion (1-a) is
thicker than the central portion (1-11). Reference numerals 2 and 2 denote electrodes attached
to both sides of the sheet. For example, as shown in FIG. 210, the piezoelectric element has its
peripheral portion fixed by the flange α) and σ). It can be used as a microphone or the like by
pulling out the conducting wire (4), (A) from one end of the 1st pole. In this case, the central part
can be made extremely thin, and even the sound of the high range is faithfully followed by the
turtle, which vibrates in a natural manner15, while the peripheral part is thick, so the amplitude
is small and the followability of the high-pitched part is bad. Since the frequency also becomes
strong, I suffer by avoiding the consumption of the electrode due to the friction μ with the
flange. Since the element in FIG. 6 is curved at the central part, the wire n at the end of the
element of 201 and (45, the sheet expands and contracts when voice exchange is transmitted,
and the film is expanded along with the expansion and contraction. Although it vibrates up and
down, in this case (4), even if the snow pressure from GS5 is constant, the thickness of the
piezoelectric body in the peripheral part and the central part is different, so the electric field
strength in the central part becomes high and extra vibration occurs. The upper central portion is
thin and light, so the amplitude followability is good, but the peripheral portion has low electric
field strength and is thick and heavy, so both frequency and amplitude are small, so consumption
of electrodes is small and it is suitable for applications such as speakers. Of course, it also loses
by using what was put on the curved surface also as a microphone. Generally, high-pitched
vibrations need to have good follow-up properties, but their energy is high, so the area of the
vibrating membrane may be relatively small, but low-pitched vibrations have a low energy, so the
same acoustic effect In order to obtain a larger area of membrane is required. The element of the
present application has a narrow thin film area with high treble trackability, and a wide area due
to tracking by the low frequency vibration 1 because it has a large area, so 1rtyh of balance
across the entire range from low to high range Kissetsu 亦 塾 ナ ス ナ ス? In addition, the
negative element of Fig. 1 and Fig. 3 is made by polarizing the raw polymer material sheet into a
piezoelectric body, and applying electrodes on both sides of this piezoelectric body by a method
such as evaporation. Although the production method is quite expensive, the simpler production
method is to deposit the electrode on the polymer material sheet first, and then apply a direct
current electric field with the deposited five electrodes as both electrodes to form the polymer
material. At the same time, it is a method of making a piezoelectric body. According to such a
polarization method, the thin portion of the central portion is strongly polarized as a result of the
electric field strength (V / m) becoming larger than that of the thin portion of the periphery, and
It is also negative by giving a property, and this is an electromechanical transducer that further
emphasizes the difference between the thin film part and the thick film part.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 are longitudinal 15 cross-sectional views of
an electro-mechanical transducer according to the present invention, and FIG. 1 shows a ridge of
an example of the device. FIG. 2 shows the element of FIG. 1 stretched. 6 is a diagram showing a
stretched state different from FIG. 1. 1 is a polymer piezoelectric sheet), 2.2 'is an electrode, 3.3'
Fi flange, 4, 4 "is a conductor 20 · EndPage: 2 or more agent patent attorney Okano-part agent
patent attorney shiori shi- 1 @ @ IM5, list of attached documents (1) 1 specification (2) 1 drawing
(8) request duplicate 1 (4) power of attorney 1 6, other inventors or agents other than the above.
(1) Inventor-(2) Agent EndPage: 3
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jps4929630, description
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