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, 2-2 inventor 3Q 'S' patent applicant applicant Kadoma city Ogata Kamonshin address 1006,
name, (582) Matsushita Electric Industrial Co., Ltd. representative Matsushita Masaharu 4 agent
〒 571 address Osaka Prefecture Kadoma city Oji Kamon 1006 List of Attachments for the
Number 45 Attachment ■ Japan Patent Office 0 JP 50-77897-[Phase] Published Japan 50.
(1975) 6.25 Japanese Patent Application Sho-sen g-128013 [phase] Application dated
application Sho-sho dj-(1973) //, / / Inside the organization number 64.665 '/ 732655
specification 1, title of the invention
-Method of manufacturing piezoelectric material
a1 Detailed Description of the Invention The present invention produces a piezoelectric material
capable of obtaining an excellent piezoelectric material by applying a DC voltage while stretching
a polymer film or sheet in at least one axis with a temperature difference. It provides a method.
Conventionally, single-crystals such as quartz crystal and Rochelle salt have long been known as
piezoelectric materials, but in recent years, ceramic dielectric ceramics such as baricum titanate
have been mainstream. Although these inorganic piezoelectric materials have high
piezoelectricity, they are difficult to mold and thin, and a flexible piezoelectric material is
particularly excellent. However, recently, it has been confirmed that polymers also have
piezoelectric properties, and the piezoelectric constants of various polymer films have been
investigated. For example, it is found that when a DC voltage is applied around a softening point
temperature of a resin such as polyvinylidene fluoride, polyvinyl fluoride, polyvinyl chloride, or
Boria clay polycarbonate, a piezoelectric effect is obtained. Furthermore, it has been found that
electretizing a previously stretched film has a large piezoelectric effect. In addition,
electretization here refers to applying a high electric field to a polymer film and cooling it from a
high temperature to room temperature. Conventionally, when electretizing a polymer film or
sheet, it takes a very long time. Furthermore, the electric field area was also limited. The
piezoelectric material that has just been completed has the disadvantage that its piezoelectric
coefficient is considerably smaller than that of the inorganic piezoelectric material. Furthermore,
although the temperature operation is required because the heating and cooling operation is
required, the temperature operation is extremely difficult and it is difficult to obtain a constant
piezoelectric material. Furthermore, there is also a defect that the piezoelectricity is greatly
damped by the unstable travel. The present invention company has been made based on the
above points, and EndPage: 1, 9, and the attached method will be described below. In FIG. 0, the
roll 1 is connected to the high voltage generator 2 while serving both as an electrode and
cooling. The roll 3 is for heating, has a large heat capacity, and is provided so that temperature
control can be performed. Reference numeral 4 is a roll for winding or a roll, and the a-le speed
can be adjusted by changing the gear ratio of the rolls 1 and 3. The primary stretching ratio can
be adjusted by changing the compression strength of the rolls 1 and 3. In the figure, 6 indicates
water. By using an apparatus having the above configuration. An example using PVQ (polyvinyl
chloride) is shown. (1) Stretch and polarize the PvC film of 200 μm by using a first N device.
In this case, the roll 1 is always kept at 20'C and a-83 is set at 100C. The electric field strength is
400 KV / am, and the stretching ratio is 4 times. The piezoelectric coefficients of the PvC zirm
produced by the apparatus set to the above condition l1ll are conventionally d51sm1, OX10-80.
q, 11. @, M, u, and 5 & (iB1m6 x 10-8a, g, ss, e, s, u, improved. It is desirable to set the electric
field strength ti and the like so as to further increase the piezoelectric coefficient by lowering the
roll speed, and to set the temperature difference to be sso′′C or more. The polymer film and
sheet according to the present invention are polyvinylidene fluoride and polyvinyl fluoride.
Thermoplastic resins such as polyvinyl chloride, poly salt ichvinylidene, polyamide,
polycarbonate, polystyrene, polyethylene, polyethylene terephthalate, polypropylene y, etc .: ff
largun, poly lay methyl ragle! Synthetic polymers such as Mate, and composites of thermoplastic
resins and inorganic substances (titanate, (lithium, lead zirconate, etc.), etc. In addition, since the
piezoelectric body manufactured by the conventional manufacturing method largely depends on
the applied voltage of the film, the film has a larger piezoelectricity as the applied voltage is
higher. The applied voltage is the temperature of the film at the time of this voltage application,
and the one just before the dielectric breakdown is applied. In the present embodiment, the
polymer film can be made to have piezoelectricity without the need to perform electretization
Wki: 'over-stowing as in the prior art. Furthermore polarization time force! In addition to being
shortened, they have been found to exhibit higher piezoelectricity than conventional piezoelectric
materials. For example, as shown in the examples, in the case of polyvinyl chloride (C) or lower
(PVC), it is intended to generate more internal strain than the film inner diameter by adding a roll
vc temperature difference of T'211. Conventionally, when using a roll to knead resins, etc., it is
possible to have a temperature difference of about 5 ° C., and wrap the film on one side of the
roll. The temperature difference was given to make it easier to take the film than the roll, and the
order of the temperature difference was completely different. Also, the direct voltage is applied
to the roll in order to shorten the polarization time. In addition, after passing the roll which has a
temperature difference and extending it, there is no big difference in a piezoelectricity in the case
where a direct current voltage is applied, when the film is electretized and extending directly.
As apparent from the above-mentioned examples, the production method of the present
invention comprises a polymer film or sheet having a temperature difference, and is formed by
direct-current electrification EEt-rolled and stretched by a pair of rolls, thus obtained The
polymer film or sheet has high voltage sensitivity under constant stress, and can produce a thin
and flexible piezoelectric material, which makes it possible to be used for piezoelectric elements
of various acoustic devices.
FIG. 2 is a schematic view showing a method of manufacturing a piezoelectric material according
to the present invention. 1.3 · · · · · · · · · · · · · · · · · · · · · · · · · high voltage generator. Name of agent
Attorney Nakao Toshio other 1 EndPage: 26 Other than the above address Address of Osaka
Prefecture Kadoma city Ogata Kadoma 1006 EndPage: 3
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