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! ・ Specification 1, title of the invention
Piezoelectric type electroacoustic transducer
The present invention relates to a piezoelectric electroacoustic transducer, and more particularly
to a piezoelectric electroacoustic transducer using a charge transfer complex and a resin-based
film as a vibrating film. . Electro-acoustic transducers using piezoelectric crystals or porcelain
have long been well known and are used in pickups, earphones, microphones and the like.
Further, in recent years, the piezoelectricity of synthetic resin films has become well known, and
in part, they have come to be used for acoustic transducers. However, if it is going to utilize the
piezoelectricity of a synthetic resin film, i (-operation is essential such as stretching and
polarization after film formation, and this not only increases the price of the piezoelectric film,
but also the polarization retention There are problems with the stability of the The inventors
discovered that an organic polymer film in which a charge transfer complex is dispersed exhibits
remarkable piezoelectricity in the process of studying a charge transfer complex. The present
invention is made based on this finding. The most characteristic of the properties of the organic
polymer film used in the present invention is that unlike the conventional synthetic piezoelectric
film, it exhibits remarkable piezoelectricity without any need for polarization operation. This
phenomenon has been observed so far in biopolymers, but not at all in synthetic polymers. It
goes without saying that the advantage of obtaining a piezoelectric film without processing after
film formation is extremely great for practical use of this type of film. Also, a second property of
the organic polymer film used in the present invention is that its impedance is extremely low.
The value is on the order of several Kn-, as described later, and shows a remarkable difference
from the transducer using a conventional piezoelectric film. The low impedance of the vibrating
membrane is a great advantage especially when applied to microphones and pickups. That is, a
means for impedance conversion, such as a field effect transistor or transistor, is not necessary.
Especially in the case of a microphone, a battery for driving the conversion circuit is not
necessary, and the effect of this is extremely thick. In general, the charge transfer complex
compound is obtained from a compound rich in π electrons acting as an electron donor, or a
compound having a non-covalent electron pair, and a compound having an electron accepting
property. Pyridine as an electron donor.
ピリダジン、ピリミジン、ピラジン、キノリン。 N-heteroaromatic compounds such as
inquinoline, dinolin, quinazoline, quinoxaline, phthalazine, pterin, phenazine, acridine, purine and
derivatives thereof are used. Soil as an electron acceptor, 1 is 7,7,8,8-tetracyanoquinodimethane.
Tetracyanoethylene and p-benzoquinone derivatives represented by the following general
formula (wherein XI, X2 '). A halogen element or 10 N group) is used as Xs and X4. These
electron donors and electron acceptors can be easily prepared as water-soluble salts by mixing in
water or directly in an organic solvent. As the binder resin for dispersing the charge transfer
complex, any polymer material having film forming ability can be used. Typical examples are
polyvinyl butyral, polycarbonate, polysulfone, polystyrene and polymethacrylic acid. These
include acrylic esters, polyvinyl acetate, polyvinyl chloride, and vinyl chloride and other
monomers and copolymers of EndPage: 2. The charge transfer complex and the binder resin are
dissolved in a polar solvent such as N, N-dimethylformamide, and applied on a substrate such as
a glass plate, for example, and the solvent is dried to form a film. A metal such as aluminum is
vapor deposited on both sides of the film obtained by peeling from the substrate to form an
electrode. The piezoelectric film thus obtained expands and contracts in the direction
perpendicular to the electric field, but exhibits completely isotropic piezoelectricity in the plane
direction without special treatment such as stretching, and in the design of the electroacoustic
transducer , Convenient. Hereinafter, the present invention will be described in detail based on
examples. Example 1 N-methyl acridinium chloride 3.91 (0,015 mole) was dissolved in 2 t of
distilled water. This was prepared separately 7, 7. . 8.8-Tetracyanoquinodimethane (hereinafter
referred to as TCNQ). When added to 1% aqueous solution of 2%, dark blue N-methylone. An
acridine-TCNQ charge transfer complex 4.9 was obtained. The charge transfer complex 1 /
together with the polycarbonate resin was dissolved in N, N-dimethylformacid 90y- to obtain a
dark green clear solution. This was coated on a glass plate preheated to 80 ° C. using a doctor
blade and dried at 100 ° C. for 2 hours to obtain a dark green film with a thickness of about 5
μm. Then, aluminum was vapor-deposited on both sides of the film obtained by peeling from the
glass plate to provide an electrode, which was used as a vibrating film of the electroacoustic
The piezoelectric vibrating film was adhered to an aluminum ring 1 having a diameter of 6 Cm,
as shown in the figure. In the figure, 2 is a vibrating film having aluminum electrodes on both
sides. After the lead wires 3 were connected to the electrodes on both sides of the vibrating
membrane 2, the ring 1 was fixed to the bank plate 6 having a large number of through holes
with a diameter of 2 mm via the foamed polyurethane 4. The acoustic transducer made in this
way exhibits a DC resistance of about 51 (, fl, and when it applies a sine wave input through an
audio amplifier and matching transformer, it emits a sound at 8 fl “RMS input voltage It was
recognized that a surface volume was sufficiently obtained as a headphone at an input voltage of
2 vRMs. When this electroacoustic transducer was used as a microphone, it was confirmed that a
voltage of 10 mvp-p is generated at about 5 odBO sound pressure. Example 2 N-octylquinolinium
chloride 2.78, p (0,01 mol) was dissolved in 2 t of distilled water, and this solution was
separately prepared of lithium -7,7,8,8-TCNQ. When it was added to a 0.2% aqueous solution 1 t,
black purple N-octylquinolinium-TCNQ charge transfer complex 1.3y- was obtained. This charge
transfer complex 150 and polyvinyl butyral oil '? emN+N−ジメチルホルムアミド1+5!?
とメチルエチルケトン1.6!? The mixture was sifted into a mixed solvent with to obtain a
lacquer for producing a piezoelectric film. This lacquer was applied to a glass substrate-H in the
manner described in Example 1 and the method was dried to obtain a film. After peeling the
obtained film from the glass plate, aluminum was vapor-deposited on both sides thereof, and this
film was incorporated as a vibrating film on back 7'L /-, polyurethane foam in the same manner
as in Example 1. , Made an electro-acoustic transducer. This piezoelectric transducer has a DC
resistance of about 10 Kfl, and when a sine wave input is applied via an audio amplifier and a
matching transformer, the volume is sufficient for a headphone at an input voltage of 1.5 vRM8
at 8 n. It was obtained. [Example 3] 3.6-ramitsu-N-methyl acridinium chloride 3.9 P (o, o 15 mol)
is dissolved in 2 t of distilled water, and this solution is separately prepared lithium -7 o y, s,
When it was added to a 0.2% aqueous solution of 5-TCNQ, it was possible to obtain a deep blue
3,6-cyano-N-methylacridine-TCNQ charge transfer complex 4.6y-. The charge transfer complex
4y- and the polyvinyl butyral resin 2oy- were dissolved in a mixed solvent of N, Ndimethylformamide 1ooy- and methyl ethyl ketone 7oy- to obtain a ranker for producing a
piezoelectric film.
A starch lacquer was applied in the same manner as in Example 1, EndPage: 3 on a glass
substrate, and the solvent was dried to form a film. The film was peeled off from the glass plate,
aluminum was vapor-deposited on both sides thereof, and the film was incorporated on a back
plate and polyurethane foam in the same manner as in Example 1 to make an acoustic
transducer. This piezoelectric acoustic transducer shows a DC resistance of about 8 I (fl, and
when a sine wave input is applied via an audio amplifier and a matching transformer, a
headphone with a 2.5 RM 8 input voltage at 8 n As enough volume was obtained. As apparent
from the above description, in the piezoelectric acoustic transducer according to the present
invention, a charge transfer complex compound formed of an electron donor and a charge
acceptor is mixed and dispersed in a resin having film forming ability. The obtained film is
characterized in that it is used as a vibrating film. According to this, since the vibration film
exhibits piezoelectricity without particularly performing the processing after film formation as in
the conventional film, it is possible to make it as an inexpensive apparatus that facilitates
assembly and manufacture. .
4 and a simple explanatory view of the drawings is an exploded perspective view showing an
embodiment of a piezoelectric electroacoustic transducer according to the present invention. 1 · ·
· Aluminum ring, 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · lead wire, 4 · · · polyurethane
foam, 5 · · · back Freight. Name of Agent Attorney Nakao and 1 other EndPage: 4
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