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JPS6244902

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DESCRIPTION JPS6244902
[0001]
<Industrial field of application> The present invention relates to a conductive gel material having
strain resistance. <Conventional technology> A conductive rubber material exists as a kind-ofspecies type distortion material, and this conductive rubber material has a characteristic of
conducting electricity by applying a pressing force. <Problems to be Solved by the Invention>
However, since such a conductive rubber material has high elasticity, there is a limitation that it
can not operate unless the force S more than the inherent elasticity of each rubber material is
applied S. Since the distortion is small, there is a problem that it is difficult to operate with a
small force, and the elasticity it has produces a repulsive elastic force against external impact, so
when vibration absorption is required Had a problem that it was difficult to use. In the present
invention, a gel-like substance made of silicone resin is used as a substrate, to which a large
amount of conductive fine particles is mixed, and the contact and separation between the fine
particles are changed in the substrate. The object is to provide a conductive gel material in which
the internal resistance value is changed by being obtained by an operation, and the above
problem is to be solved by the characteristics of the above-mentioned substrate. For the
conductive gel material of the present invention is based on a gel-like substance made of a
silicone resin, it has a large strain resistance and is free to deform, and has a small inherent
elastic force. The conductive fine particles that are easily deformed by force and are contained in
the inside are brought into contact with each other to change the amount of electrification. The
change in the amount of current flow can be obtained as a change in the resistance value caused
by the increase or decrease in the number of parallel circuits, because it is obtained by the
change in the number of electric paths generated by the contact of the conductive particles
inside. DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of a
conductive gel material according to the present invention, showing a state in which a large
number of conductive particles 2 are mixed in a substrate l. The substrate l is made of a gel-like
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substance having a penetration of 50 to 200 measured according to JIS K 2530-1976- (50 g
load), and this gel-like substance is a silicone resin such as Toray Silicone Co., Ltd. (7) It is made
by mixing the brand name CF-5027A and CF-5027B which concern on manufacture. The outer
surface of the substrate 1 is covered with a soft non-tagging outer layer 11 except for the
electrodes 3 and 3, and the outer layer 11 is coated with a silicone resin based paint on the outer
surface of the substrate 1. It may be formed by crosslinking reaction, or it may be formed by
laminating a non-woven fabric or a flexible outer coating with small impact resilience on the
substrate l. As the former paint, a silicone resin-based acetic acid type or oxime type release
agent, an adhesive or the like may be used, and as this substance, trade name 5H237 discion or
5E 5001 according to Toray Silicone Co., Ltd. And SH780 etc.
Further, as the latter outer coating, there are trade name TAFFAN manufactured by Lord
Chemical Products, and trade name rZ DE LJ which is a high damping rubber manufactured by
Bridgestone Corporation. Any conductive material may be used as the conductive fine particles 2,
but if a magnetic substance such as nickel is used, for example, a conductive material of a
magnetic sensitive type can be made, and the conductivity can be selected by selecting the mass
of the conductive material. The specific gravity of the gel material itself can be selected. The
electrode 3.3 may be formed by applying a conductive paint to the substrate l, or may be formed
with an aluminum foil or the like so as to resist it. As shown in FIG. 1, the projections 31 may be
protruded and embedded in the base. In the above process, the conductive gel material of the
present invention can be configured as follows. In addition to the conductive fine particles 2,
insulating magnetic fine particles or hollow fine particles called organic or inorganic so-called
balloons may be mixed in the substrate l, so that the magnetic properties of the conductive gel
material of the present invention, and so on. Other physical properties can be added. I: In the
base body l, as shown in FIG. 1, a flexible, high-resistance wire conductor 4 may be inserted to
always flow a bias current between the electrodes 3 and 3. The bias current can normally operate
the circuit element. Although the electrodes 3 and 3 are usually provided in the opposite
direction as shown in the drawing, they may be provided in a non-opposite direction such as a
perpendicular direction in some cases, and it is not necessary to be particularly limited to the
embodiment. Since the conductive gel material of the present invention is such, when an external
force such as a pressing force is applied to the substrate l to cause distortion in the substrate l,
the conductive fine particles 2 mixed in the substrate are thereby changed. They are mutually
connected to form a complex network inside, which changes the amount of current flowing
between the electrodes 3.3. This internal network 1 is formed by the generation of a large
number of parallel circuits, since the conductive fine particles 2 usually increase the degree of
contact, if, for example, an external force is applied in the direction of the arrow in FIG. It will The
conductive gel material of the present invention is used as a silicon gel substrate having a
penetration of 50 to 200 as described above. Therefore, it is necessary to use conductive fine
particles 2 having stable conductivity with respect to silicon gel. That is, it is necessary to select a
substance which does not oxidize on the surface when the conductive fine particle 2 is mixed in
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the silicon gel, and in this embodiment, a conductive substance such as fine particles of nickel,
cobalt, gold, silver, carbon, etc. Using coated particles. 2. Since mixing the fine particles increases
the apparent hardness of the substrate, the penetration of the silicone gel is selected according to
the type and amount of fine particles.
Also, it is desirable that the fine particles are uniformly dispersed in the silicon gel substrate, and
in particular, care should be taken not to cause precipitation. That is, since the silicon gel which
is the base of the conductive gel material usually has a specific gravity of about 0.98 and it takes
about 30 minutes to gel from a liquid, the conductive fine particles are gelled if they are lighter
than the silicon gel It will be concentrated later afterward, and if it is heavy it will be
concentrated downward after gelation. In order to prevent such uneven distribution of the
particles and to disperse them uniformly in the substrate, it is necessary to make the specific
gravity of the particles close to that of the silicone gel. For this purpose, in the embodiment, fine
particles of specific gravity 0.90 in which a glass-based silica balloon is coated with nickel or the
like as the conductive fine particles 2 are used. The fine particles are mixed in a weight ratio of
20 to 80% in a silicone gel substrate, and the particle size is made to be about 30 to 1 OOIL. If
the mixing ratio is preferably about 30 to 60%, if it is less than 30%, there is a problem that the
volume resistance becomes large, and if it exceeds 60%, the apparent hardness of the substrate 1
becomes high to cause a problem in bufferability. As such conductive fine particles, there is NCP
under the trade name of Nippon Chemical Industry Co., Ltd. manufactured. The conductive gel
material is prepared by mixing conductive fine particles into a mixture of CF-5027A and CF5027B manufactured by Toray Silicone Co., Ltd., for example, and conducting defoaming if
desired. It can be made by gelation at the end. In this manufacturing process, the molding
process may be performed by a method such as injection processing, roll coating, silk printing,
spray coating, mold pressing and molding, and the gelation process is performed, for example, at
a temperature of 80 to 150 ° C. for 30 minutes. The heating may be performed for 240
minutes. The conductive gel material of the present invention thus produced has the following
characteristics. First, the conductive gel material has a conductive property as shown in FIG. 2A.
The conductive gel material used for this measurement is a substrate 1 made of a silicone gel
having a penetration of 150, which is mixed with 60% by weight of product NCP-3t of Nippon
Chemical Industrial Co., Ltd. as conductive fine particles, It is molded into a cylindrical shape with
a diameter of 30 mm and a thickness of 25 mm, and electrodes are provided at both ends
thereof. The measuring method is to compress and deform the conductive gel material from the
thickness direction, and measure the relationship between the compression class and the interelectrode resistance value, and as the thickness is compressed as shown in FIG. 2A. It was
confirmed that the resistance value decreased significantly. Next, the vibration characteristics of
the conductive gel material were measured by the above sample.
As a result, as shown in FIG. 2B, it was found that the resonance magnification near the
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resonance frequency was as small as 4 times, and the vibration absorption was good. In FIG. 2B,
the a line is a gel material of a single silicone gel with a penetration of 150, and the b line is an
organic balloon in a silicone gel substrate with a penetration of 150 (trade name: Expancell
manufactured by Nippon Phillite Co., Ltd.) 3% by weight of gel material mixed with C, line C: a gel
material made of 40% by weight of inorganic balloon (trade name: Fillite manufactured by
Nippon Phillite Co., Ltd.) on a silicon gel substrate with a penetration of 150, line d: gel of the
present invention The vibration curve of the material is shown. In this test, each gel material is
cylindrically shaped with a diameter of 3 ° and a height of 25 intestines, and each 1058.5 kg (7)
load-t'7-pull displacement 0.051 Vibration is applied by a vibrator. Next, the impact of this
conductive gel material! ! The buffering effect is described below. In this test, each sample was
made into a mat-like shape with a thickness of 10 + am, and was measured by the iron ball drop
impact method. The samples include Ensolite, a trade name manufactured by Uniroyal
Corporation of the United States, a silicone gel having a penetration of 150 degrees, and
Torleepef, a trade name manufactured by Toshi Co., Ltd. And four kinds of cushioning materials
were used. The iron ball drop impact method detects and measures the shock transmitted to the
table at this time with a pickup provided on the table lower surface by dropping an iron ball of
510 g from the height of 69 c + w to a shock absorber placed on the iron table "-" In this case,
the collision velocity of the iron ball in this case is 3.68 m / s, and the momentum is 1.88 Kg @ m
/ s. For the impact measurement, the maximum impact force was measured using a storage
oscilloscope manufactured by Kikusui Electronics Co., Ltd. The results are shown below as impact
force (G). 1st 112th average Ensolai l-1? , 80 17.95 17.78 toru leve +9.03 20.11 19.57 silicon
gel medium 14.3 B 13.65 14.00 conductive gel materials 12. I33 12.93 12.113 and above show
that the buffer effect of the conductive gel material is the best. Furthermore, the conductive gel
material can also be expected to have a magnetic shielding effect by making the conductive fine
particles 2 of magnetic material. The magnetic characteristics, that is, the magnetic shield effect,
the attraction effect, the magnetic detection function, and the like can be freely selected
according to the type of magnetic substance and the amount of fine particles. Next, usage
examples of the conductive gel material of the present invention will be described with reference
to FIG.
FIG. 3 shows a displacement meter using the conductive gel material A according to the present
invention. The external force applied to the conductive gel material A changes the internal
resistance value of the conductive gel material A, and the change in the output current caused
thereby It is detected by the detection load H connected to the power source E. 2) The load for
detection R may be for vibration detection. In this way, the vibration generated in the conductive
gel material A can be detected by the load R for both the waveform and the strength, and the
conductive gel material A is used as a vibration sensor It can. What is shown in FIG. 4 is a
vibration generator using the present conductive gel material A, and in the conductive gel
material A, magnetic particles are mixed. A coil C is wound around the conductive gel material A,
and the coil C is supplied with a signal from a power source having a potential change, for
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example, an AC power source E. Therefore, when a signal is supplied from the power source E to
the coil C, the conductive gel material A vibrates due to the magnetic field generated in the coil C.
This vibration can be obtained via the diaphragm P if it is transmitted to the diaphragm P, for
example. It can. In this case, since the conductive gel material of the present invention has an
inherent vibration frequency, the periphery of the diaphragm P is surrounded by a support 51
such as a gel substance or soft rubber as in the sound wave generator 50 of FIG. If an excitation
signal which is supported by the magnetic substrate 52 and sent to the coil C so as to match the
natural vibration frequency of the conductive gel material is transmitted, sound waves can be
generated by the vibration of the diaphragm 53. FIG. 6 shows an example in which a large
number of electrodes 3.3 of the conductive gel material are provided in directions orthogonal to
each other on one surface and the other surface of the substrate l, and this is used for the
pressure sensor 60. A large number of linear electrodes 3Xa, 3Xb,... 3Xn formed in parallel on
one side of the base to constitute an X-axis quadrupole group, and a large number of linear
electrodes formed on the other side of the base in parallel The electrodes 3Ya, 3Yb,... 3Yn are
configured in a Y-axis quadrupole group. Therefore, in this pressure sensor, when pressure is
applied to one point, for example, point 61 in the figure, the internal resistance between the
electrodes 3Xb and 3Yb decreases and the amount of current increases. Pressure can be
detected. FIG. 7 shows a clamper 70 using the electrode gel material, and this clamper 70 is used,
for example, as a claw of a robot. The inner side of the sandwiching piece 71.71 of the clamper
70 is formed as a pressing portion, and the pressing portion is formed of the conductive gel
material A of the present invention. The conductive gel material A of the pressure part is formed
of an outer layer having a large frictional property and is selected by an object which grasps the
penetration of the substrate 1, for example, in the case of holding an egg A silicone gel material
having a penetration of about 100 to 200 is used.
The conductive gel material A of the pressurizing unit sends the pressure at the time of holding
as an electric signal to the control unit 72, and the clamping pressure and moving operation of
the clamper 70 are controlled by this signal. 'The conductive gel material of the present invention
can detect asperities of an object by surface deformation due to contact, so it can also be used as,
for example, a sensor of a Braille reader for blind people or a touch sensor for detecting
movement of an object Security devices and theft devices. What is shown in FIG. 8 is a pressure
detection device 80 using the conductive gel material A for the detection unit 81, which detects
the pressure of the pressure fluid and sends a control signal to the control unit 83 of the solenoid
valve 82. Are configured. What is shown in FIG. 9 is an accelerometer 90 using a single electrode
material A. This accelerometer 90 accommodates a weight body 92 in a base frame 91 and 1lower straining substance, for example, gel-like substance The conductive gel material A is
attached to the weight body 92 so as to receive the plain stitch of the weight body 92 toward the
acceleration direction a while supporting the conductive gel material A with the conductive gel
material A. A rigid support 94 is interposed between the base frames 91. Therefore, when
acceleration is applied to the base frame 91, the weight body 92 presses the conductive gel
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material A against the support body 94 to deform and distort it. Acceleration is measured. FIG.
10 shows a three-dimensional accelerometer 100 using the conductive gel material A. The
accelerometer 100 accommodates the weight body 102 in the base frame 101 and allows the
weight body 102 to be freely oriented. Supported in the frame by a support 103 made of, for
example, a gel-like substance harder than the conductive gel material A or a strip harder than the
conductive gel material, and further, the -I-distribution copper body 102 and the support The
conductive gel material A is interposed between 103, and the weight body 102 receives an
acceleration to press the conductive gel material A against the support body 103, thereby
causing the conductive gel material A to distort and generate a detection signal. It is configured
in the same way. The weight body 102 may have a positive cubic shape, which may apply a
pressing force to the conductive gel material A easily, or may be spherical in some cases, which is
advantageous in that the installation location of the conductive gel material A can be increased.
There is. The conductive gel material A shown in FIGS. 9 and 10 is preferably a hard electrode,
for example, one plated with gold on copper, or the like, and the support bodies 94 and 103 have
the conductive gel material A with a reaction force. It may be made of an insulating material that
can be compressed. What is shown in FIG. 11 is a backing 110 using the present conductive gel
material A, and the backing 110 is made using the conductive gel material A mixed with
conductive fine particles of magnetic material.
The conductive fine particles are produced, for example, by electrochemically electroless plating
nickel on a vitreous sili balloon, and magnetically couple the two tubes 111 and 112 while
magnetically shielding them. Since this backing 110 is pinched by the tube ill, 112 and is
deformed flat, the conductivity is improved, and hence the tube lit, 112 forms the waveguide of
the electromagnetic wave generator 113. In particular, the shielding effect is good. FIG. 12 shows
a variable resistor 120 using the conductive gel material A. This variable resistor 120 moves the
hard terminal electrodes 3 and 3 relatively in the contacting and separating directions by the
operating means such as the screw 121 or the like. And the substrate l is deformed or distorted
by compression or decompression, whereby the substrate! It is configured to obtain the electric
resistance change inside as the voltage between terminals. What is shown in FIG. 13 is a variable
resistor 130 using the conductive gel material A of the present invention. This variable resistor
obliquely encloses the conductive gel material A having a uniform thickness in the case 131, and
this conductive gel material The output voltage is obtained by pressing the surface of A with a
movable pressing element, for example, a rolling ball 132 having a locus in the vertical plane. It
is designed to be moved over the gel material. What is shown in FIG. 14 is an impact force
measuring instrument 140 for sports etc., which measures the force of self in martial arts such as
karate, for example. The conductive gel material A is fixed, and the display unit 142 is provided
which receives the strain amount generated between the electrodes as an electrical signal and
analyzes and displays the signal, and the electrode on the impact receiving side of the conductive
gel material A A protective outer layer 143 is formed to protect the In the measuring device 140,
the conductive gel material A also acts as a buffer material, so that the finger of the measuring
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person is effectively protected. FIG. 15 shows a vibration detector 150 using the conductive gel
material A. This detector 150 abuts the detection needle 151 against the vibrating body 152, and
the top of the detection needle 151 is electrically conductive. The gel material A is made to abut,
and the conductive gel material yA is configured to detect the vibration of the detection needle
151. In the embodiment, two conductive gel materials A are used on the left and right sides, so
that the left and right tilting of the detection needle 151 can also be detected, and the output
signal of one pair of conductive gel materials A and A is subjected to multiplication or subtraction
Can perform more accurate detection operation. 0 in the same figure 153 is a flexible support.
The detector 150 can be used, for example, as a pickup for detecting a vibration signal from a
record groove.
FIG. 16 shows a magnetic flux densitometer device 1160 using the conductive gel material A. In
this device, the conductive fine particles 2 of the conductive gel material A are made of magnetic
material and the conductive gel material A is to be measured. A contact portion 163 is attached
to the tip of the measurement yoke 162 so as to abut directly on the body 161. In such an
apparatus, since the contact portion 163 of the conductive gel material A is in close contact with
the object to be measured 161 while being deformed, the contact accuracy is extremely good,
and the measurement by the gap generated between the object to be measured 181 and the
contact portion 163 There is an advantage that the error is extremely small, and since the strain
of the other conductive gel material A can be taken out as an electric signal, there is also an
advantage that the hardness of the object to be measured 161 can be measured simultaneously.
FIG. 17 shows a speaker 170 using the conductive gel material A. In this example of use, the
conductive fine particle 2 may be a magnetic material. The speaker 170 has an annular surface
172 of the conductive gel material A around the diaphragm 171 as shown in FIG. 17A, and a
large number of coils 173 are arranged below this annular surface as shown in FIG. 17B. The
annular surface 172 and the coil 173 are held by the frame 174, and a signal is supplied to the
coil 173 from the input signal source, whereby the annular surface 172 vibrates, and the
vibration causes the diaphragm 171 to vibrate. Accordingly, since the speaker 170 is driven from
the outer peripheral portion to generate a vibration wave, there is an advantage that complicated
distortion of the diaphragm can be removed as compared with the conventional central vibration
method. That is, the present speaker generates driving vibration with the annular surface 172
having a large area on the outer periphery, so that the driving force is well transmitted and the
driving force itself is large, and the annular surface 172 is made of a gel material having good
deformation and distortion. Therefore, the vibration of the diaphragm is not disturbed. FIG. 18
shows an insulator 180 capable of changing the spring constant, in which an elastic cylindrical
outer body 183 is interposed between a pressure receiving portion 181 made of a magnetic
material and a base 182, and A conductive gel material A mixed with conductive fine particles 2
of a magnetic substance is enclosed in the coil, and a coil 184 for generating a magnetic field is
wound around the outer casing 183 and an excitation current is generated from the control unit
185 in the coil 184 To generate a control magnetic field. In the insulator 180, since the buffer
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characteristics of the conductive gel material A differ depending on the magnetization of the
conductive fine particles 2 inside, the same effect as changing the spring constant can be
obtained. At the same time, the output voltage between the electrodes 3.3 changes due to the
insulator being subjected to the vibration of the external force at the same time, so that the
excitation current flowing through the coil can be optimally controlled using this voltage
waveform. is there.
FIG. 19 shows a displacement gauge 190 using the conductive gel material A. The displacement
gauge covers the conductive gel material A with a protective film 191 using, for example, a
Teflon film coat or a fluorine-based rubber. It is used by standing up in liquid or the like. In this
case, the displacement meter 190 is deformed by the liquid pressure, so that the resistance
between the electrodes 3 and 3 changes, and the liquid level can be detected by the measuring
unit 192 and displayed on the display unit 193. In the example shown in FIG. 20, the conductive
gel material A in which conductive fine particles of a magnetic substance are mixed is interposed
between the printed coil 201 and the magnetic plate 202 with a variable impedance 200 de
using the conductive gel material A. The distance between the magnetic plate 202 and the coil
201 is changed by advancing and retracting the magnetic plate 202 by adjustment means such
as a screw 203 or the like. The gel material of the variable impedance 200 may be mixed with
only the magnetic fine particles, but if the conductive gel material is used, the value of the
impedance can be indirectly detected by the voltage change between the electrodes. 21 shows a
touch panel switch 210. This switch 210 is provided with a large number of switch portions 212
on the panel 211, and the wedge switch portion 212 has a finger pressing surface on one of the
electrodes 3 and 3 of the conductive gel material A. The electric circuit 214 is connected to the
chisel-like electrode and is formed so as to supply an input signal to the electric circuit 214 by
pressing the finger pressing surface 213. Furthermore, the conductive gel material of the present
invention can be made to have stable characteristics in temperature or to have temperature
dependent characteristics of the thermistor type by selecting the temperature characteristics of
the conductive fine particles mixed inside. It can. <Effects of the Invention> The conductive gel
material of the present invention uses a gel material with a penetration of 50 to 200 for the
substrate, so it has small impact resilience and good strain resistance. There is an advantage that
the gel material of silicone resin has a good shock absorbing property because it has a good
vibration absorbing property.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a longitudinal sectional view of the conductive gel material of the present invention, FIG.
2 is a chart showing the resistance change characteristics of the above-mentioned upper gel
material, and FIGS. 3 to 21 show examples of use of the conductive gel material of the present
invention. FIG.
In the figure, 1 is a substrate, 2 is a conductive fine particle, 3 is an electrode, and A is a
conductive gel material of the present invention.
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