TWI642543B - Stretch sensor - Google Patents

Abstract

A tensile sensor comprises a first elastic insulating layer, a first elastic conductive layer, an elastic dielectric layer, a second elastic conductive layer and a second elastic insulating layer. The composition of the first elastic insulating layer comprises an elastic resin. The first elastic conductive layer is disposed on the first elastic insulating layer, and the composition of the first elastic conductive layer includes an elastic resin and a conductive material. The elastic dielectric layer is disposed on the first elastic conductive layer, and the elastic dielectric layer comprises an elastic resin and a dielectric material, and the dielectric material is composed of a Sr _1-x Ca _x TiO ₃ compound and a Sr _1-y The Ba _y TiO ₃ compound is composed of at least one of a BaTiO ₃ compound, whereby the dielectric constant of the dielectric material is between 15.65 Farads/meter and 2087.3 Farads/meter. The second elastic conductive layer contains an elastic resin and a conductive material. The second elastic insulating layer is disposed on the second elastic conductive layer and contains an elastic resin.

Description

Stretch sensor

The present invention relates to a tensile sensor, and more particularly to a stretching sensor that utilizes an elastic resin and a dielectric material to form an elastic dielectric layer.

In the field of human-computer interaction, since the wearable device can be worn on the user's body and become a part of the user, and provides the user to operate through his own body movements, it can not only effectively integrate into the daily life of the user. Among them, it is more convenient for the user's life because of the functions provided by the wearable device.

However, since the wearable device primarily senses the motion of the user through various sensors, the sensor must be flexible and stretchable to sense various bending or stretching actions.

In the prior art, in order to provide the sensor with a flexible function, an elastic resin is mainly used as an elastic dielectric layer, and electrodes are disposed on both sides of the elastic dielectric layer, and then formed by electrodes on both sides. The sensing capacitor is used to change the sensing capacitance formed by the electrodes on both sides when the elastic dielectric layer is stretched to shorten the distance between the electrodes on both sides, thereby calculating the amount of tensile deformation; however, due to the general elastic resin The value of k is lower, for example, the relative dielectric constant of rubber is about 2 to 3, so When rubber is used as the elastic dielectric layer, the value of the induced capacitance can be limited. Therefore, the sensor which uses an elastic resin such as rubber as the elastic dielectric layer cannot effectively measure the transmitted capacitance value. The extent to which the detector is stretched.

Further, in the prior art, although the ability of the elastic resin to be polarized can be improved by modifying the elastic resin, thereby increasing the dielectric constant, the overall manufacturing cost is greatly increased by the modification.

In view of the prior art, the existing tensile sensor mainly uses an elastic resin as the elastic dielectric layer in the tensile sensor, but the capacitance value that can be formed due to the lower dielectric constant of the general elastic resin. Limited, and thus the sensitivity of the sensing elongation is poor, and although the elastic resin can be modified to increase the dielectric constant, it will greatly increase the cost. Accordingly, it is an object of the present invention to provide a tensile sensor that utilizes the addition of a dielectric material to increase the equivalent dielectric constant of the elastic dielectric layer.

In order to achieve the above object, the present invention provides a tensile sensor comprising a first elastic insulating layer, a first elastic conductive layer, an elastic dielectric layer, a second elastic conductive layer and a second elastic insulating layer. . The composition of the first elastic insulating layer comprises an elastic resin. The first elastic conductive layer is disposed on the first elastic insulating layer, and the composition of the first elastic conductive layer includes an elastic resin and a conductive material. The elastic dielectric layer is disposed on the first elastic conductive layer, and the elastic dielectric layer comprises an elastic resin and a dielectric material, and the dielectric material is composed of a Sr _1-x Ca _x TiO ₃ compound and a Sr _{1- The y} Ba _y TiO ₃ compound is composed of at least one of a BaTiO ₃ compound, and 0.1 ≦ x ≦ 0.9, 0.1 ≦ y ≦ 0.9, whereby the dielectric constant (Dielectric Constant; K) of the dielectric material is between 15.65 Farah / meter and 2087.3 Farah / meter. The second elastic conductive layer is disposed on the elastic dielectric layer, and the second elastic conductive layer is composed of an elastic resin and a conductive material. The second elastic insulating layer is disposed on the second elastic conductive layer, and the composition of the second elastic insulating layer includes an elastic resin.

Wherein, the composition of the above elastic resin comprises at least a monovinyl terminated polydimethylsiloxane, a vinyl modified Q silica resin or dimethyl methyl hydrogen. (Methylhydrosiloxane-dimethylsiloxane copolymer, trimethylsiloxane terminated).

In addition, the composition of the elastic resin comprises a content of the monovinyl-terminated polydimethyl siloxane of more than 70%; the composition of the elastic resin comprises a content of the vinyl-modified Q 矽 resin of less than 30%; The content of the dimethyl methyl hydrogen (pyridoxane and polyoxydecan) contained in the composition is less than 10%.

In one embodiment of the invention, the elastic dielectric layer contains 10% to 20% of a dielectric material, and the dielectric material is composed of a Sr _1-x Ca _x TiO ₃ compound, and the dielectric constant of the dielectric material is It is between 15.65 Farads/meter and 31.31 Farads/meter, so that the dielectric constant of the elastic dielectric layer is between 4.85 Farads/meter and 9.45 Farads/meter.

In one embodiment of the invention, the elastic dielectric layer contains 10% to 20% of a dielectric material, and the dielectric material is composed of a Sr _1-y Ba _y TiO ₃ compound, and the dielectric constant of the dielectric material is It is between 139.84 Farads/meter and 206.64 Farads/meter, so that the dielectric constant of the elastic dielectric layer is between 18.66 Farads/meter and 44.63 Farads/meter.

In one embodiment of the invention, the elastic dielectric layer contains 10% to 20% of a dielectric material, and the dielectric material is composed of a BaTiO ₃ compound, and the dielectric constant of the dielectric material is 2087.3 Farads/meter. Therefore, the dielectric constant of the elastic dielectric layer is between 207.48 Farads/meter and 408.31 Farads/meter.

As described above, since the elastic dielectric layer used in the tensile sensor provided by the present invention is formed by mixing an elastic resin and a dielectric material, the amount of the dielectric material added can be changed according to the needs of the user. The equivalent dielectric constant of the elastic dielectric layer is then adjusted.

100‧‧‧ stretching sensor

1‧‧‧First elastic insulation

2‧‧‧First elastic conductive layer

3‧‧‧Elastic dielectric layer

4‧‧‧Second elastic conductive layer

5‧‧‧Second elastic insulation

L1‧‧‧ first direction

L2‧‧‧ second direction

D1‧‧‧first thickness

D2‧‧‧second thickness

1 is a perspective exploded view showing a stretching sensor according to a preferred embodiment of the present invention; and a second perspective view showing a stretching sensor according to a preferred embodiment of the present invention; The figure is a schematic view of the AA cross section of the second figure; the fourth figure is an enlarged view of the circle B of the third figure; the fifth figure is a schematic cross-sectional view of the tensile sensor of the third figure after being stretched; An enlarged view of the circle C of the fifth figure; FIG. 7 is a schematic view showing the change of capacitance of the dielectric material provided by the preferred embodiment of the present invention at different addition amounts; and the eighth figure shows the dielectric material provided by the preferred embodiment of the present invention at different added amounts. A schematic diagram of capacitance variation; and a ninth diagram showing a percentage change in thickness of an elastic dielectric layer provided by a preferred embodiment of the present invention at different elongation rates.

Specific embodiments of the present invention will be described in more detail below with reference to the drawings. Advantages and features of the present invention will be apparent from the description and appended claims. It should be noted that the drawings are all in a very simplified form and both use non-precise proportions, and are only for convenience and clarity to assist the purpose of the embodiments of the present invention.

Referring to the first and second figures, the first drawing shows a perspective exploded view of a stretching sensor according to a preferred embodiment of the present invention; the second drawing shows the stretching provided by the preferred embodiment of the present invention. A stereoscopic view of the sensor.

As shown, a tensile sensor 100 includes a first elastic insulating layer 1, a first elastic conductive layer 2, an elastic dielectric layer 3, a second elastic conductive layer 4, and a second elastic insulating layer. 5.

The composition of the first elastic insulating layer 1 comprises an elastic resin, wherein the composition of the elastic resin comprises a monovinyl terminated polydimethylsiloxane (CAS No. 68951-99-5), ethylene. Vinyl modified Q silica resin (CAS No.) It is 68584-83-8) and dimethylmethyl hydride (trimethyl siloxane) (trimethyl siloxane terminated, CAS No. is 68037-59-2), and the composition of the elastic resin The content of the monovinyl-terminated polydimethyl siloxane containing more than 70%, the content of the vinyl-modified Q 矽 resin contained in the composition of the elastic resin is less than 30%, and the dimethyl group contained in the composition of the elastic resin The content of methyl hydrogen (pyridoxane and polyoxyalkylene) is less than 10%; in the present embodiment, the composition of the elastic resin comprises monovinyl-terminated polydimethyl siloxane, vinyl modified Q The content of the decyl resin and dimethylmethylhydrogen (anethanum oxide and polyoxyalkylene oxide) is 75%, 20% and 5%, respectively, and the elongation of the first elastic insulating layer 1 can reach about 340%.

As described above, in practical applications, the elastic resin can increase the degree of crosslinking by adding a crosslinking agent or by electron beam irradiation, thereby increasing the elasticity and strength of the elastic resin, wherein the crosslinking agent is, for example, a peroxide. Propylene (DCP), etc., but is not limited thereto.

The first elastic conductive layer 2 is disposed on the first elastic insulating layer 1, and the first elastic conductive layer 2 comprises the above elastic resin and a conductive material, and the conductive material is a conductor such as a carbon nanotube or a nano silver fiber. And the conductive material was added in an amount of 50% by weight.

The elastic dielectric layer 3 is disposed on the first elastic conductive layer 2, and the elastic dielectric layer 3 is composed of the above elastic resin and a dielectric material. Wherein, the dielectric material is composed of a Sr _1-x Ca _x TiO ₃ compound, and 0.1≦x≦0.9, so that the dielectric constant (Dielectric Constant; K) is between 15.65 Farads/meter and 31.31 Farads/meter. Between the feet.

Table 1 below shows the relative increase in dielectric constant of the composition of the dielectric material and the different addition amounts. As shown in Table 1, when x = 0.1, the dielectric material (Sr _0.9 Ca _0.1 TiO ₃ compound) is dielectric. The constant is 31.31 Farads/meter; when x=0.9, the dielectric material (Sr _0.1 Ca _0.9 TiO ₃ compound) has a dielectric constant of 15.65 Farads/meter. In addition, since the dielectric material is added in an amount of 10% by weight to 20% by weight, when the dielectric material (Sr _1-x Ca _x TiO ₃ compound) has different x values, the dielectric constant is relatively increased after the dielectric material is added. The difference may be different, so that the elastic dielectric layer 3 can pass the dielectric material of 10 wt% to 20 wt%, and the dielectric constant of the elastic dielectric layer 3 can be between 4.85 Farads/meter and 9.45 Farads/meter. .

In this embodiment, in addition to the above-mentioned Sr _1-x Ca _x TiO ₃ compound, a dielectric material may optionally be added with a Sr _1-y Ba _y TiO ₃ compound or a BaTiO ₃ compound, wherein 0.1 ≦ y ≦ 0.9, And the dielectric constant of the Sr _1-y Ba _y TiO ₃ compound and the BaTiO ₃ compound is added to the dielectric layer 3 by adding 10 wt% to 20 wt% of a dielectric material (Sr _1-y Ba _y TiO ₃ or BaTiO ₃ ). The constants are shown in Table 2 and Table 3.

Table II:

It can be seen from Table 1, Table 2 and Table 3 above that the elastic dielectric layer 3 of the present embodiment can contain 10% to 20% of a dielectric material by adding, and the dielectric material is composed of Sr _1-x Ca _x TiO. ₃ compound, Sr _1-y Ba _y TiO ₃ compound and at least one of BaTiO ₃ compounds, and further, the dielectric constant of the elastic dielectric layer 3 containing the dielectric material is between 4.85 Farads/meter to 408.31 Farads. / between meters.

In the present embodiment, the second elastic conductive layer 4 is the same as the first elastic conductive layer 2 described above, and the composition thereof also includes the above-mentioned elastic resin and the above-mentioned conductive material, so that there is no mention here.

In the present embodiment, the second elastic insulating layer 5 is the same as the first elastic insulating layer 1 described above, and its composition also includes the above-mentioned elastic resin, so that there is no mention here.

Please refer to the third to sixth figures. The third figure is the AA cross-sectional view of the second figure; the fourth figure is the enlarged view of the circle B of the third figure; the fifth figure is the tensile sensing of the third figure. The cross-sectional view of the device after being stretched; the sixth figure is an enlarged view of the circle C of the fifth figure.

As shown, when the two ends of the tensile sensor 100 are respectively stretched in a first direction L1 and a second direction L2 opposite to the first direction L1, the thickness of the elastic dielectric layer 3 is The first thickness d1 is reduced to a second thickness d2.

According to the above, based on the principle of C=εA/d (C is the capacitance, ε is the permittivity of the medium, A is the area of the two parallel conductors, and d is the separation distance), when the thickness of the elastic dielectric layer 3 is first When the thickness d1 is reduced to the second thickness d2, the capacitance value between the first elastic conductive layer 2 and the second elastic conductive layer 4 naturally increases relatively.

Please refer to the seventh figure, which is a schematic diagram showing the change of capacitance of the dielectric material provided by the preferred embodiment of the present invention under different added amounts. As shown, when the dielectric material (Sr _1-x Ca _x TiO ₃ compound) has a value of 0.9, the dielectric material (Sr _0.2 Ca _0.8 TiO ₃ compound) has a dielectric constant of 15.65, so when a dielectric material When the elastic resin is added in an amount of 10% of the powder, the dielectric constant (K value) of the elastic dielectric layer 3 is 4.85 Farads/meter, and when the dielectric material is added to the elastic body with a powder addition amount of 20%. In the case of a resin, the dielectric constant of the elastic dielectric layer 3 is 6.25 Farads/meter; in addition, when the amount of the dielectric material added is 0, the dielectric constant of the elastic dielectric layer 3 (3.45 Farads/meter) is The dielectric constant of the above elastic resin itself; thus, it can be seen that the elastic dielectric layer 3 of the present invention can effectively increase the overall equivalent dielectric constant by adding 10% to 20% of a dielectric material.

Please refer to the eighth figure, which is a schematic diagram showing the change of capacitance of the dielectric material provided by the preferred embodiment of the present invention under different added amounts. As shown, similarly to the above-described x = 0.9 of a dielectric material (Sr _0.1 Ca _0.9 TiO ₃ compound), for example, the capacitance (F) of the elastic dielectric layer 3 without adding a ^5-12 dielectric material with dielectric added in an amount of 10% and 20% of the dielectric material up to ^7-12 and ^9-12.

Please refer to the ninth figure, which is a schematic view showing the percentage change of thickness of the elastic dielectric layer provided by the preferred embodiment of the present invention at different elongation rates. As shown in the figure, the elastic dielectric layer 3 composed of the above dielectric material (Sr _0.1 Ca _0.9 TiO ₃ compound) of x = 0.9 is also taken as an example, when the elastic dielectric layer 3 is stretched to an elongation ratio of about At 235%, the curve change (dashed line) of the 10% dielectric material added to the elastic dielectric layer 3 and the curve change (solid line) of the 10% dielectric material added to the elastic dielectric layer 3 can exhibit a gradual decreasing linear change.

In summary, the elastic dielectric layer used in the tensile sensor provided by the present invention contains 10% to 20% by weight of a dielectric material (Sr _1-x Ca _x TiO ₃ compound, Sr _1-y). Ba _y TiO ₃ compound or a BaTiO ₃ compound, and 0.1≦x≦0.9, 0.1≦y≦0.9), thus effectively controlling the equivalent dielectric constant of the elastic dielectric layer as a whole from 4.85 Farads/meter to 408.31 The dielectric constant between the farad/meter is generally lower than the low dielectric constant of 2 to 4, and the dielectric constant is required to be improved by the modification. The elastic dielectric layer of the present invention The dielectric constant can be increased by the addition of the dielectric material, thereby relatively increasing the capacitance of the elastic dielectric layer, and effectively reducing the manufacturing cost.

The above is only a preferred embodiment of the present invention, and is not There are no restrictions on the invention. Any changes in the technical means and technical contents disclosed in the present invention may be made by those skilled in the art without departing from the technical means of the present invention. The content is still within the scope of protection of the present invention.

Claims (9)

A tensile sensor comprising: a first elastic insulating layer comprising an elastic resin; a first elastic conductive layer disposed on the first elastic insulating layer, wherein the first elastic conductive layer comprises the elastic resin and a conductive material, which is a carbon nanotube or a nano silver fiber; an elastic dielectric layer is disposed on the first elastic conductive layer, and the elastic dielectric layer comprises the elastic resin and a dielectric material, The dielectric material is composed of at least one of a Sr _1-x Ca _x TiO ₃ compound, a Sr _1-y Ba _y TiO ₃ compound and a BaTiO ₃ compound, and 0.1≦x≦0.9, 0.1≦y ≦0.9, whereby the dielectric constant (Dielectric Constant; K) of the dielectric material is between 15.65 Farads/meter and 2087.3 Farads/meter; a second elastic conductive layer is disposed on the elastic dielectric layer And the second elastic conductive layer comprises the elastic resin and the conductive material; and a second elastic insulating layer is disposed on the second elastic conductive layer, and the second elastic insulating layer comprises the elastic resin; wherein The dielectric constant of the elastic dielectric layer is 4.85 Farads / metric Farah between 408.31 / meter with. The tensile sensor of claim 1, wherein the composition of the elastic resin comprises at least mono vinyl terminated polydimethylsiloxane, vinyl modified Q矽. Vinyl modified Q silica resin or dimethyl methyl hydrogen (porphyrin and poly Methylhydrosiloxane-dimethylsiloxane copolymer (trimethylsiloxane terminated). The tensile sensor of claim 2, wherein the composition of the elastic resin comprises a monovinyl-terminated polydimethyl siloxane having a content greater than 70%. The tensile sensor of claim 2, wherein the composition of the elastic resin comprises a vinyl-modified Q 矽 resin content of less than 30%. The tensile sensor of claim 2, wherein the composition of the elastic resin comprises less than 10% of dimethyl methyl hydrogen (oxygen alkane and polyoxyalkylene). The tensile sensor of claim 1, wherein the elastic dielectric layer contains 10% to 20% of the dielectric material, and the dielectric material is composed of the Sr _1-x Ca _x TiO ₃ compound composed of a dielectric material having a dielectric constant of between 15.65 farads/meter and 31.31 farads/meter, whereby the dielectric constant of the elastic dielectric layer is between 4.85 Farads per meter and 9.45. Farah / meter between. The tensile sensor of claim 1, wherein the elastic dielectric layer contains 10% to 20% of the dielectric material, and the dielectric material is composed of the Sr _1-y Ba _y TiO ₃ compound composed of a dielectric material having a dielectric constant between 139.84 Farads/meter and 206.64 Farads/meter, whereby the dielectric constant of the elastic dielectric layer is between 18.66 Farads/meter Between 44.63 Farah / meter. The tensile sensor of claim 1, wherein the elastic dielectric layer contains 10% to 20% of the dielectric material, and the dielectric material is composed of the BaTiO ₃ compound, and The dielectric material has a dielectric constant of 2087.3 Farads/meter, whereby the dielectric constant of the elastic dielectric layer is between 207.48 Farads/meter and 408.31 Farads/meter. The tensile sensor according to claim 1, wherein the conductive material is added in an amount of 50% by weight.