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JPS5562494

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DESCRIPTION JPS5562494
Description / name of invention
Piezoelectric transducer for electric stringed instruments
3. Detailed Description of the Invention The present invention relates to a piezoelectric
transducer used in the pickup portion of an electric stringed instrument. Generally, an electric
stringed instrument such as an electric piano is provided with a piezoelectric transducer made of
a ceramic piezoelectric body for each of a plurality of strings stretched on a frame together with
a sound insulator, and the transducers convert the vibration of the string into an electric signal It
is converted, amplified and then supplied to a speaker for sounding. However, conventionally,
seven piezoelectric transducers are required for each string as described above, and the structure
becomes complicated. As assembly and color also make line work very troublesome, the price
increase can not be avoided. In addition, since sefmic piezoelectric materials have been used
conventionally, natural musical instruments and hooks can only obtain sounds of metallic tones
that are separate from one another, and at the same time they have the disadvantage of being
fragile and having low mechanical strength. EndPage: 1 In order to eliminate these drawbacks,
the applicant has used a polymeric piezoelectric material or a polymeric composite piezoelectric
material which is already tough and excellent in processability as compared to a ceramic type
material, as a piezoelectric material. A flexible strip-shaped piezoelectric transducer is proposed
in which a cable-shaped piezoelectric cable is embedded in an outer skin layer made of a flexible
material (elastomer). However, since this strip-shaped piezoelectric transducer is flexible, its
output is high in the high range It turned out that there is a characteristic to reduce. An object of
the present invention is to provide a flexible band-shaped piezoelectric transducer capable of
preventing a sharp decrease in output in a high range. The present invention relates to a flexible
strip piezoelectric transducer in which a flexible piezoelectric cable having a flexible piezoelectric
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layer provided on the outer periphery of a center electrode and an outer electrode formed on the
outer periphery is embedded in a long flat flexible outer layer. , Hardness of the skin layer
material! The main object is to use an elastomer of rO or more, or to make the outer electrode of
the piezoelectric cable braid or wind so as to compress the piezoelectric layer to increase the
stiffness of the piezoelectric transducer. As the outer cover layer material, rubber or synthetic
resin having appropriate elasticity and good processability such as urethane rubber, butadiene
rubber, natural rubber, synthetic rubber, styrene rubber butadiene rubber, PVDF, nylon,
polycarbonate, epoxy, polypropylene etc. can be used. Piezoelectric materials for piezoelectric
cables include flexible polymeric piezoelectric materials such as polyvinylidene fluoride (PVDF)
and polyvinyl fluoride, or natural rubber, fluororubber, butyl rubber, urethane rubber, silicone
rubber, natural rubber such as chlorobrene or synthetic rubber or A polymer composite
piezoelectric material obtained by combining a flexible polymer material such as a synthetic resin
such as PVDF and a ferroelectric ceramic powder can be used.
Next, the first invention of the present application will be described based on an embodiment
shown in the drawings. FIG. 1 shows a piezoelectric transducer A according to an embodiment of
the present invention, which has a construction in which a piezoelectric cable 2 with an outer
diameter of 20'llll is embedded in a long and flat outer skin layer 2 '. Piezoelectric cable ■ is
provided with a piezoelectric layer of diameter /, ll s formed of polymer composite piezoelectric
material made of chlorobrene rubber on the outer periphery of center electrode 2 of diameter 02
penalty formed by twisting stainless fine wire, and the outer periphery And an outer electrode 3
of 3 WlH having a thickness Q made of a metal film or a conductive rubber are laminated and
polarized. This piezoelectric cable is manufactured, for example, by extruding a piezoelectric
material together with a central electrode and providing a piezoelectric layer and adhering an
outer electrode to the outer periphery thereof. The material of the piezoelectric layer which can
be formed by extrusion is a spring type The hardness is in the range of hardness tO to 70 in the
same hardness test as that of the rubber according to the hardness test, and in the present
embodiment, the hardness is 乙 0. The outer coat layer 3 is in the form of a strip having a
thickness of 3 vm and a width / S 朋, and in the present embodiment is a strip having a thickness
of 3 vm and a width / S 朋, and in the present embodiment, a hard O hard urethane rubber is
used. By increasing the material hardness of the outer coat layer, the stiffness of the piezoelectric
transducer A becomes remarkably large as compared with the piezoelectric transducer having a
hardness of 70 or less of the outer coat layer. FIG. 2 shows a piezoelectric transducer B according
to an embodiment of the second invention of the present application. The piezoelectric
transducer B of this embodiment has the same specifications as the piezoelectric transducer A of
the first invention except that the outer electrode 0 is formed of a thin metal wire braided in a
state where the piezoelectric layer 2 is compressed. As a result, stay 7ness is increased. Next, the
piezoelectric transducers A and B according to the first and second embodiments and the
piezoelectric transducer C having the same specifications as the piezoelectric transducer A except
that the outer cover layer is formed of polyurethane having a rubber hardness of 70 In the case
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of using a piezoelectric pick-up of an electric stringed instrument as shown in FIG. 3, the
acceleration is made constant by the vibrator r via a load which applies the same downward
compressive force as the external force exerted by the tension of the string and The output
characteristics when the frequency is changed in the range of 20 Hz to 10 FJ-1, are shown in the
graph of FIG. The piezoelectric transducer A according to the first invention of the present
invention is remarkably excellent in output characteristics in the high frequency range compared
to the conventional piezoelectric transducer C having low stiffness due to the graphic of FIG. The
piezoelectric transducer B according to the second invention of the present invention, in which
the cable is hardened and the stiffness is further increased than that of the piezoelectric
transducer A, the output characteristic of the high range is further enhanced, and the simple S
filter. In the piezoelectric transducer according to the first aspect of the present invention, the
hardness of the outer cover layer material is set to go or more in the spring type rubber hardness
test method. If it is less than this, EndPage of the piezoelectric transducer: 2 Stiffness is small and
improvement of output characteristics in high frequency range It is desirable that the hardness of
the skin material is in the range of gSN de.
In addition, the stiffness of the piezoelectric transducer decreases as the thickness of the outer
skin layer increases. Therefore, when the outer skin layer is formed of a material of the same
rubber hardness, the output characteristics of the piezoelectric transducer in the high frequency
range of the piezoelectric transducer increase as the thickness of the outer skin layer increases.
descend. In the second embodiment of the present invention, the stiffness of both the outer skin
layer and the piezoelectric cable is increased (and the stiffness of the piezoelectric transducer is
increased. However, the outer skin layer is a flexible material having a hardness of 70 or less. It
is also possible to use a piezoelectric material and compress the piezoelectric layer with an outer
skin layer only to increase the stiffness of the piezoelectric transducer using a material with high
stiffness. The piezoelectric transducer of the present invention may have a structure in which two
or more piezoelectric cables are embedded in the outer skin layer, and an output can be taken
out from each of the piezoelectric cables (and the outer electrode for compressing the
piezoelectric layer is piezoelectric The piezoelectric transducer according to the first aspect of
the present invention can increase the stiffness by winding the metal wire around the outer
periphery of the layer as in the case of scratching since the outer skin layer is formed of an
elastomer having a hardness of go or more. High output can be maintained up to the pitch range,
making it excellent for use in electric stringed instruments. In the piezoelectric transducer
according to the second aspect of the present invention, the stiffness of the piezoelectric cable is
increased at the outer electrode (the stiffness can be divided so that high output can be
maintained up to the high frequency range. Furthermore, by increasing the stiffness of both the
outer skin layer and the piezoelectric cable (and increasing the stay of the piezoelectric
transducer, the frequency characteristic of the high-frequency range is further improved.
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a piezoelectric
transducer showing one embodiment of the first invention of the present application, FIG. 2 is a
longitudinal sectional view of one embodiment of the second invention of the present application,
and FIG. Fig. 7 is a schematic diagram showing the test results of the pressure test of the vessel.
In the figure, A, B, C: Piezoelectric transducer ··· Piezoelectric cable · · · Piezoelectric layer · · · ·
Center actual pole · · · Outer electrode · · · Outer skin layer Fig. 4 EndPage: 3
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