JP6852010B2 - Electrodes, wearable devices and methods for manufacturing electrodes - Google Patents

Description

Embodiments of the present invention relate to electrodes, electrode manufacturing methods and wearable devices.

Biological signal sensing for measuring various biological signals is performed in various fields. Examples of biological signals include myoelectric potentials, ocular potentials, and electroencephalograms. In biological signal sensing, electrodes are attached to the living body, and this information is measured by changes in the weak voltage obtained from the electrodes. Electrodes for biological signal sensing are roughly classified into dry electrodes made of metal using silver or silver chloride material and wet electrodes called gel pads or the like.

Jitsukaisho 64-04 2008 issue U.S. Pat. No. 5,431,166 Japanese Patent Application Laid-Open No. 2007-044208 U.S. Pat. No. 7,957,785 Special Table 2006-509559 U.S. Pat. No. 7,512,449 Jitsukaisho 59-68549 Gazette Japanese Unexamined Patent Publication No. 2016-67722 Japanese Unexamined Patent Publication No. 2008-194400

The dry electrode is mainly used for a resting human body in a medical institution such as a hospital, but it is difficult to attach it to a living body during exercise. Therefore, it is difficult to sense the biological signal of the living body during exercise. Although the wet electrode can be used in daily life, there are restrictions on the mounting method and repeated use, and there is also a problem in convenience.

The above-mentioned problems are not limited to electrodes for biological sensing, but are widely applicable to electrodes in general.

An object of the present invention is to provide an electrode, a method for manufacturing an electrode, and a wearable device, which are highly convenient and capable of detecting a weak voltage fluctuation.

According to the embodiment, the electrodes are a conductive sheet in which a first conductive silicon rubber sheet containing carbon and a second conductive silicon rubber sheet containing silver are laminated, a lead wire, and the lead wire. It includes a terminal member that is electrically connected to the conductive sheet . The terminal member includes a crimping portion into which the wire of the lead wire is inserted, and a flat plate portion integrally formed with the crimping portion. The flat plate portion includes a first portion and a second portion other than the first portion. The first portion is folded so that the first surface of the first portion faces the first surface of the second portion. One end of the conductive sheet is connected to the terminal member in a state of being sandwiched between the first surface of the folded first portion and the first surface of the second portion. Will be done. The portion of the conductive sheet other than the one end portion is folded back so as to cover the second surface of the first portion.

It is sectional drawing which shows an example of the structure of the conductive sheet 10 used for the electrode of an embodiment. It is a figure which shows the 1st example of the lead wire drawing of embodiment. It is a figure which shows the 2nd example of the lead wire drawing of embodiment. It is a figure which shows the 3rd example of the lead wire drawing of embodiment. It is a figure which shows the 4th example of the lead wire drawing of embodiment. It is a figure which shows the 4th example of the lead wire drawing of embodiment. It is a figure which shows the 5th example of the lead wire drawing of embodiment. It is a figure which shows an example of the round terminal used in the 5th example of the lead wire lead-out of an embodiment. It is a figure for demonstrating the manufacturing process of 5th example of the lead wire drawing of embodiment. It is a figure which shows an example of the case used for the electrode of an embodiment. It is a figure which shows the 6th example of the lead wire drawing of embodiment. It is a figure which shows the glasses type wearable apparatus which is an example of the application example of the electrode of an embodiment.

Hereinafter, embodiments will be described with reference to the drawings. The disclosure is merely an example, and the invention is not limited by the contents described in the following embodiments. Modifications that can be easily conceived by those skilled in the art are naturally included in the scope of disclosure. In order to clarify the explanation, in the drawings, the size, shape, etc. of each part may be changed with respect to the actual embodiment and represented schematically. In a plurality of drawings, the corresponding elements may be given the same reference numbers and detailed description may be omitted.

[Conductive sheet]
In order to improve convenience, a dry and flexible electrode is desired. As an example of this, an electrode using conductive silicon rubber can be considered. However, the resistance of conductive silicone rubber is about 500Ω, and the electrical resistance of the skin (epidermis of the human body) (about 10kΩ when dry, decreases when wet, but about 1/12 of dry when sweaty). Even when wet, it is a size that cannot be ignored compared to about 1/25) when it is dry. Therefore, it is difficult to accurately measure a weak voltage with an electrode using conductive silicon rubber. Further, since the conductive silicone rubber is easily torn, it is difficult to fix the lead wire electrically connected to the electrode to the electrode. The embodiment provides an electrode using an improved conductive silicone rubber.

FIG. 1 is a cross-sectional view showing an example of the structure of the conductive sheet 10 used for the electrode of the embodiment. The conductive sheet 10 is composed of a laminated first conductive silicon rubber sheet 12 and a second conductive silicon rubber sheet 14. One aspect of lamination is to apply the second conductive silicone rubber sheet 14 to the first conductive silicone rubber sheet 12. For convenience of explanation, the first conductive silicon rubber sheet 12 side is referred to as the lower side of the conductive sheet 10, the second conductive silicon rubber sheet 14 side is referred to as the upper side of the conductive sheet 10, and the first conductive silicon rubber sheet 12 The lower surface is called the back surface of the conductive sheet 10, and the upper surface of the second conductive silicon rubber sheet 14 is called the front surface of the conductive sheet 10. The resistance of general conductive silicon rubber is about 500 Ω, and the skin (human body). The electrical resistance of the skin) (about 10 kΩ when dry, when wet, the resistance value decreases, but about 1/12 when dry in a sweaty state, about 1/25 when dry even when wet) It is a size that cannot be ignored in comparison. Therefore, it is difficult to accurately measure the weak voltage, but since the resistance of the conductive silicone rubber changes depending on the presence or absence of the mixture, the first conductive silicone rubber sheet 12 and the second conductive silicone rubber sheet containing the mixture are contained. 14 is used.

The first conductive silicone rubber sheet 12 is made of conductive silicone rubber containing carbon, and the second conductive silicone rubber sheet 14 is made of conductive silicone rubber containing silver. The first conductive silicone rubber sheet 12 does not contain silver. The second conductive silicone rubber sheet 14 does not contain carbon. Therefore, the resistance value of the first conductive silicon rubber sheet 12 is 30 Ω or less when measured at a distance of 1 cm from the surface, but varies widely to 20 Ω depending on the location. The resistance value of the second conductive silicon rubber sheet 14 is 0.5 Ω or less when measured at a distance of 1 cm from the surface, and there is no variation depending on the location. The second conductive silicon rubber sheet 14 is equivalent in electrical characteristics to a metal dry electrode. Moreover, the conductive sheet 10 is easier to be attached to a living body than a dry electrode, and it is also possible to sense a biological signal of a living body during exercise. As described above, the second conductive silicone rubber sheet 14 has higher conductivity than the first conductive silicone rubber sheet 12.

The total thickness of the conductive sheet 10 is about 0.5 mm to 1.0 mm, and the first conductive silicon rubber sheet 12 and the second conductive silicon rubber sheet 14 may have the same thickness or may be different. It may be thick. When the thicknesses of the two are different, the second conductive silicon rubber sheet 14 may be thinner than the first conductive silicon rubber sheet 12, and the second conductive silicon rubber sheet 14 may be thinner than the first conductive silicon. It may be thicker than the rubber sheet 12. That is, the thicknesses of the first conductive silicon rubber sheet 12 and the second conductive silicon rubber sheet 14 are arbitrary.

The flexibility of silicone rubber varies depending on the presence and type of the mixture, and the silicone rubber alone without the mixture has the best flexibility. The first conductive silicone rubber sheet 12 containing carbon is the next most flexible, and the second conductive silicone rubber sheet 14 containing silver is the least flexible. Therefore, if the electrode is composed of only the second conductive silicon rubber sheet 14, the electrode has high conductivity, but is brittle, easily torn, and inconvenient to use. Therefore, the second conductive silicon rubber sheet 14 having high conductivity but poor flexibility, and the first conductive silicon rubber sheet 12 having lower conductivity but excellent flexibility than the second conductive silicon rubber sheet 14. Is laminated to realize a conductive sheet 10 having both conductivity and flexibility.

In order to use the conductive sheet 10 as a sensor electrode, a lead wire for transmitting a signal sensed by the conductive sheet 10 to the circuit is electrically connected to the conductive sheet 10 (or the lead wire is connected from the conductive sheet 10). Need to pull out). As a method for pulling out the lead wire from the seat member, it is conceivable to fix the lead wire to the seat member with a hook or the like. For example, it is conceivable to sandwich the seat member with a hook and fix the tip of the lead wire to the concave side of the hook. However, since the silicone rubber sheet is thin and flexible, when a force is applied to the lead wire, it may be torn or torn at the hook. In the embodiment, the lead wire and the conductive sheet 10 are electrically connected by the method shown in FIGS. 2 to 11 without stressing the conductive sheet 10.

[Lead wire lead-out example 1]
In the first example shown in FIG. 2, a lead wire is attached to the conductive sheet 10 using a slit, and a sensor electrode is manufactured. The second conductive silicone rubber sheet 14 serves as a sense surface in contact with the human body.

FIGS. 2A and 2B show an example of a sensor electrode provided with two slits 22a and 22b at one end of the conductive sheet 10 in the x direction. FIG. 2A is a perspective view of the sensor electrode, and FIG. 2B is a cross-sectional view of the sensor electrode. The slits 22a and 22b are made by making a cut in the conductive sheet 10 along the x direction. The plurality of slits 22a and 22b are arranged in the y direction.

The lead wire 100 is arranged along the y direction on the back surface (first conductive silicon rubber sheet 12) of one end of the conductive sheet 10 in which the slits 22a and 22b are formed in the x direction. The lead wire 100 comprises a metal wire covered with an insulating coating. Although not shown, the rear end of the lead wire 100 is electrically connected to the sensor circuit. The tip of the lead wire 100 is guided from the back surface of the conductive sheet 10 to the front surface (second conductive silicon rubber sheet 14) through the slit 22a, and further guided from the front surface to the back surface through the adjacent slit 22b. The tip of the lead wire 100 is stripped of coating, and the wire 122 of the lead wire 100 is adhered to the back surface of the conductive sheet 10 with a tape 102 or a conductive adhesive. The tape 102 may be a conductive tape or an insulating tape. As a result, the lead wire 100 is attached along the front surface and the back surface of the conductive sheet 10. The length of the slits 22a and 22b needs to be larger than the diameter of the lead wire 100, but it may be long enough to allow the work of passing the lead wire 100 through. Since the slits 22a and 22b suppress the movement of the lead wire 100, the lead wire 100 does not come out of the slits 22a and 22b even if the lead wire 100 is pulled in a direction away from the conductive sheet 10. In order to obtain this effect, the lengths of the slits 22a and 22b should be as short as possible.

As a result, the lead wire 100 can be electrically connected to the conductive sheet 10, and a sensor electrode using the conductive sheet 10 is realized. Since the conductive sheet 10 contains the second conductive silicon rubber sheet 14 having high conductivity, a sensor electrode capable of sensing even a weak biological signal without being affected by noise is realized. Since the wire 122 at the tip of the lead wire 100 is adhered to the first conductive silicon rubber sheet 12 which is the back surface of the conductive sheet 10, the second conductive silicon rubber sheet 14 having high conductivity is brought into contact with the human body to make a sensor. There is no problem when using the electrode as a biosensor.

2 (c) and 2 (d) show an example of a sensor electrode provided with four slits 24a, 24b, 26a, and 26b at one end of the conductive sheet 10 in the x direction. FIG. 2C is a perspective view of the sensor electrode, and FIG. 2D is a cross-sectional view of the sensor electrode. The slits 24a, 24b, 26a, 26b are made by making a cut in the conductive sheet 10 along the x direction. The plurality of slits 24a, 24b, 26a, 26b are arranged in the y direction.

The lead wire 100 is arranged along the y direction on the back surface (first conductive silicon rubber sheet 12) of one end of the conductive sheet 10 in which the slits 24a, 24b, 26a, and 26b are formed in the x direction. The tip of the lead wire 100 is guided from the back surface of the conductive sheet 10 to the front surface (second conductive silicon rubber sheet 14) through the slit 22a, is further guided from the front surface to the back surface through the adjacent slit 22b, and is further conductive through the slit 26a. It is guided from the back surface of the sheet 10 to the front surface, and is guided from the front surface to the back surface through the adjacent slit 26b. The tip of the lead wire 100 is stripped of coating, and the wire 122 of the lead wire 100 is adhered to the back surface of the conductive sheet 10 with a conductive adhesive 104 or tape. As a result, the lead wire 100 is attached along the front surface and the back surface of the conductive sheet 10.

Similar to FIGS. 2 (a) and 2 (b), the sensor electrode using the conductive sheet 10 is also realized by FIGS. 2 (c) and 2 (d). Since the number of slits is larger in the examples of FIGS. 2 (c) and 2 (d), the lead wire 100 is more firmly attached to the conductive sheet 10.

Note that FIG. 2 may be modified as follows. The lead wire 100 may be arranged on the surface of the conductive sheet 10 (second conductive silicon rubber sheet 14), and the wire 122 at the tip of the lead wire 100 may be adhered to the surface of the conductive sheet 10. The slit may be provided at the end in the y direction instead of being provided at the center in the y direction. Instead of removing the coating only with the tip of the lead wire 100, all or part of the coating portion of the lead wire 100 in contact with the conductive sheet 10 is removed, and the wire 122 is attached to the conductive sheet 10 with the tape 102 or the adhesive 104. It may be adhered to the first conductive silicon rubber sheet 12 and the second conductive silicon rubber sheet 14 on both sides in a wide range. As a result, the lead wire 100 is more firmly attached to the conductive sheet 10.

Since a slit having a short length is equivalent to a hole, the hole is not limited to the slit, and the hole may be used. When the diameter of the hole is substantially equal to that of the lead wire 100, the lead wire 100 does not come off from the hole even if the lead wire 100 is pulled from the rear end due to friction between the lead wire 100 and the hole. The shape of the hole is not limited to a circle, but may be an ellipse, a triangle, a square, or a rectangle.

Even if at least the portion of the conductive sheet 10 near the lead wire 100 is surrounded by a flexible case (not shown in FIG. 2, but similar to the case 202 shown in FIG. 10 or the case 204 shown in FIG. 11). Good. The portion of the conductive sheet 10 that comes into contact with the living body is an opening. When the case has a structure in which the lead wire 100 is firmly pressed against the conductive sheet 10, it is possible to omit bonding the tip or at least a part of the lead wire 100 to the conductive sheet 10 with the tape 102 or the adhesive 104. When surrounded by a case, the tape 102 or the adhesive 104 for fixing the wire at the tip of the lead wire 100 to the conductive sheet 10 becomes unnecessary. Further, when surrounding with a case, all or a part of the covering portion of the lead wire 100 in contact with the conductive sheet 10 is removed, and the wire 122 is attached to the first conductive silicone rubber sheets 12 and 2 on both sides of the conductive sheet 10. There is also no need for a tape or adhesive to be fixed to the conductive silicone rubber sheet 14.

[Lead wire lead-out example 2]
The second example shown in FIG. 3 uses a slit having the same structure as that of the first example, but the method of attaching the lead wire 100 is different. 3 (a), (b), (c), and (d) correspond to FIGS. 2 (a), (b), (c), and (d), respectively. In the first example of FIG. 2, the tip of the lead wire 100 is passed through a slit only once and guided from the back surface of the conductive sheet 10 to the front surface, and further, another slit is also passed through the back surface only once and guided from the front surface to the back surface. On the other hand, in the second example of the sensor electrode shown in FIG. 3, the lead wire 100 is wound around the sections 22, 24, 26 between the pair of slits 22a, 22b; 24a, 24b; 26a, 26b at least once. Has been done. That is, the tip of the lead wire 100 is passed through the same slit at least twice and guided from the back surface to the front surface of the conductive sheet 10, or is guided from the front surface to the back surface. As a result, even if the lead wire 100 is pulled away from the conductive sheet 10, the lead wire 100 does not come off from the sections 22, 24, 26, and the lead wire 100 is made stronger with respect to the conductive sheet 10. Can be attached to. The more times the lead wire 100 is wound around the sections 22, 24, 26, the more firmly the lead wire 100 is attached to the conductive sheet 10.

When it takes time to wind the lead wire around the section between the pair of slits, not only the pair of slits 22a and 22b but also the third slit 22c connecting one ends of the pair of slits 22a and 22b is provided. The section 22 made up of the three slits 22a, 22b, 22c may be raised upward from the lead sheet 10. The lead wire 100 can be easily wound around the section 22 in a state of being raised upward from the conductive sheet 10. Thereby, the efficiency of the work of winding the lead wire around the section 22 can be improved. The same applies to other sections. When the winding of the lead wire is completed, the section 22 is returned to the same surface as the sheet.

The second example is also deformable like the first example. In addition, among the modified examples of the first example, the modified example in which a hole is used instead of the slit is not applied to the second example.

[Lead wire lead-out example 3]
In the first and second examples described above, at least two slits or holes are provided in the conductive sheet 10, the tip of the lead wire 100 is sequentially passed through the slits or holes, and the lead wire 100 is passed through the back surface of the conductive sheet 10. The lead wire 100 is attached to the conductive sheet 10 by guiding the lead wire from the front surface to the front surface and from the front surface to the back surface. It is equivalent to sewing work to sequentially pass the tip of the lead wire 100 through the slit or the hole, guide the lead wire 100 from the back surface to the front surface of the conductive sheet 10, and guide the lead wire 100 from the front surface to the back surface. Therefore, FIG. 4 shows a third attachment example in which the conductive sheet 10 is sewn with the lead wire 100 without providing a slit or a hole in the conductive sheet 10. The sewing method may be hand-sewn or a sewing machine may be used.

The sensor electrodes shown in FIGS. 4 (a) and 4 (b) are equivalent to the sensor electrodes when the number of slits is increased in FIGS. 2 (c) and 2 (d). The sensor electrodes shown in FIGS. 4 (c) and 4 (d) are equivalent to the sensor electrodes when the number of slits is increased in FIGS. 3 (c) and 3 (d). The sewing mode is not limited to simple sewing, and complicated sewing such as reverse stitching may be used. In the latter case, the lead wire 100 is more firmly attached to the conductive sheet 10. In this case, the coating may be removed from all or part of the lead wire 100 in contact with the conductive sheet 10, and the lead wire 100 may be adhered to the conductive sheet 10 in a wide range. In this example, the tape 102 or the adhesive 104 for adhering the tip of the lead wire 100 to the surface of the conductive sheet 10 becomes unnecessary.

When sewing is used in this way, it is not necessary to provide a slit or a hole in the conductive sheet 10, and the lead wire 100 can be easily and firmly attached to the conductive sheet 10.

The third example is also deformable like the first example. In addition, among the modified examples of the first example, the modified example in which a hole is used instead of the slit is not applied to the third example.

[Lead wire lead-out example 4]
In the above three examples, the lead wire 100 is guided from the front surface to the back surface of the conductive sheet 10 or from the back surface to the front surface, so that the lead wire 100 is attached to the front surface and the back surface of the conductive sheet 10. Next, FIGS. 5 and 6 show a fourth example in which the lead wire 100 is attached to the conductive sheet 10 in a state where the lead wire 100 is located only on one surface of the conductive sheet 10. FIG. 5A is a perspective view of the electrode sensor of the third example, and FIG. 5B is a cross-sectional view of the electrode sensor. The wire 122 of the lead wire 100 from which the coating has been removed is arranged along the y direction on the surface of one end of the conductive sheet 10 in the x direction (second conductive silicon rubber sheet 12), and is located closer to the position of the lead wire 100. The tip of the conductive sheet 10 is folded back 180 degrees upward. The folded tip portion and the unfolded one end portion are bonded by the conductive adhesive 106 with the wire 122 of the lead wire 100 sandwiched between them.

As a result, the second conductive silicon rubber sheet 14 at the folded tip and the second conductive silicon rubber sheet 14 at one end of the unfolded conductive sheet 10 sandwich the wire 122 of the lead wire 100 from above and below. In this state, it is electrically connected to the wire 122 of the lead wire 100. In addition, in order to further ensure the adhesion by the adhesive 106, the folded tip portion and the unfolded one end portion may be adhered by the tape 108.

In the examples of FIGS. 5A and 5B, the tip of the conductive sheet 10 is folded back so that the second conductive silicon rubber sheet 14 faces each other, so that the sensation electrode can be used as a biosensor. When the second conductive silicone rubber sheet 14 is brought into contact with a living body, the presence of the folded portion may hinder depending on the contact location of the sensor. In order to avoid this, the front and back surfaces of FIGS. 5A and 5B are inverted, the lead wire 100 is arranged on the side of the first conductive silicone rubber sheet 12, and the first conductive silicone rubber sheet 12 faces each other. It is conceivable that the tip end portion of the conductive sheet 10 is folded back as described above. However, since the wire 122 of the lead wire 100 is connected to the first conductive silicon rubber sheet 12 having low conductivity, it may be difficult to accurately extract the sensing signal.

In order to reduce such a possibility, as shown in FIG. 5C, one end of the conductive sheet 10 in the x direction is folded downward by 90 degrees (valley fold). The folded tip portion is further folded 180 degrees upward at a position half of the tip portion so that the second conductive silicone rubber sheet 14 faces each other. The tip of the conductive sheet 10 has the same surface as the second conductive silicone rubber sheet 14 of the conductive sheet 10 which is not folded back. The wire 122 of the lead wire 100 is sandwiched between the second conductive silicon rubber sheets 14 which are folded back 180 degrees and face each other, and are bonded by the conductive adhesive 106. In order to maintain the 180 degree folded structure of the second conductive silicon rubber sheet 14, the first conductive silicon rubber sheet 12 and the second conductive silicon rubber sheet 14 at the tip may be adhered by the tape 108. .. In this example, since only the tape 108 is present on the surface of the second conductive silicon rubber sheet 14, there is no problem when the second conductive silicon rubber sheet 14 is brought into contact with the living body.

Further, as shown in FIG. 6 (a), it is conceivable that the number of folds is set to 2 or more in the examples of FIGS. 5 (a) and 5 (b). The conductive sheet 10 is arranged so that the first conductive silicon rubber sheet 12 is on the upper side. The wire 122 of the lead wire 100 is arranged along the y direction on the surface of one end of the conductive sheet 10 in the x direction (first conductive silicon rubber sheet 12), and the conductive sheet 10 is located more than the position of the lead wire 100. The tip is folded 180 degrees upward. By this first folding, the tip end portion of the conductive sheet 10 is folded so that the first conductive silicone rubber sheet 12 faces each other. In this state, the tip of the conductive sheet 10 is further folded back 180 degrees downward. By this second folding, the first conductive silicon rubber sheet 12 and the second conductive silicon rubber sheet 14 come to face each other. The second conductive silicon rubber sheet 14 at the tip of the conductive sheet 10 which is a folded portion and the first conductive silicon rubber sheet 12 at one end of the unfolded conductive sheet 10 are the wires of the lead wire 100. The 122 is sandwiched between the adhesives 106.

As a result, the second conductive silicon rubber sheet 14 at the tip that is folded back twice and the first conductive silicon rubber sheet 12 at one end of the conductive sheet 10 that is not folded back are the wires 122 of the lead wires 100 from above and below. Is electrically connected to the wire 122 of the lead wire 100 with the wire 122 sandwiched between the two. In addition, in order to further ensure the adhesion by the adhesive 106, the folded tip portion and the unfolded one end portion may be adhered by the tape 108. Since the folded portion is on the side of the first conductive silicon rubber sheet 12 of the conductive sheet 10, there is no problem when the second conductive silicon rubber sheet 14 is brought into contact with the living body.

FIG. 6B is an example in which the number of wrappings is three.

Also in the examples of FIGS. 5A and 5B, the number of times of folding is set to a plurality, that is, the wire 122 of the lead wire 100 is stored so as to be wound around the second conductive silicon rubber sheet 14 of the conductive sheet 10. You may.

[Lead wire lead-out example 5]
7 (a) and 7 (b) are cross-sectional views of a fifth example of a sensor electrode in which a lead wire 100 is connected to a conductive sheet 10 by using a crimp terminal 40. In the examples of FIGS. 7A and 7B, the tip of the crimp terminal 40 is folded back, and one end of the conductive sheet 10 is sandwiched between the folded portions and fixed to the crimp terminal 40, and then the conductive sheet. The remaining part of 10 is folded back to form an electrode. 7 (a) and 7 (b) show an example in which the front and back sides of the conductive sheet 10 when sandwiched between the crimp terminals 40 are inverted. That is, in the example of FIG. 7A, when the conductive sheet 10 is folded back at the folded portion of the tip of the crimp terminal 40, the second conductive silicon rubber sheet 14 of the conductive sheet 10 presses the tip of the crimp terminal 40. The conductive sheet 10 is sandwiched between the folded portions at the tip of the crimp terminal 40 so as to be sandwiched and opposed to each other. In the example of FIG. 7B, when the conductive sheet 10 is folded back at the folded portion of the tip of the crimp terminal 40, the first conductive silicon rubber sheet 12 of the conductive sheet 10 sandwiches the tip of the crimp terminal 40. The conductive sheet 10 is sandwiched between the folded portions at the tip of the crimp terminal 40 so as to face each other. In the example of FIG. 7A, when the second conductive silicon rubber sheet 14 is brought into contact with the human body, the crimp terminal 40 is on the same side as the second conductive silicon rubber sheet 14 of the conductive sheet 10, so that the biosensor The crimp terminal 40 may be hindered depending on the contact location. However, in the example of FIG. 7B, when the second conductive silicon rubber sheet 14 is brought into contact with the human body, the crimp terminal 40 is unlikely to cause any trouble.

As shown in FIG. 8A, the crimp terminal 40 has a circular ring-shaped terminal portion 42 having a hole 44 formed in the center so that it can be attached to a circuit board or the like with a screw or the like, and a wire integrally formed with the terminal portion 42. It consists of a barrel 46 and an insulator barrel 48. The shape of the terminal portion 42 is not limited to a circular ring shape, but may be a polygonal shape such as a square having a hole formed therein, or a U-shape or a V-shape with a cut tip. The hole 44 of the terminal portion 42 may be omitted. After the lead wire 100 from which the tip coating has been removed is inserted into the wire barrel 46 and the insulator barrel 48, pressure is applied to the wire barrel 46 and the insulator barrel 48 by a special tool, and the wire 122 is fixed to the wire barrel 46. Then, the covering portion of the lead wire 100 is fixed to the insulator barrel 48. The insulator barrel 48 may be omitted.

As shown in FIG. 8B, the semicircular ring portion at the tip of the terminal portion 42 of the crimp terminal 40 in this state is provided on the upper side (the wire barrel 46 and the insulator barrel 48) with respect to the folded wire orthogonal to the lead wire 100. It is folded back 180 degrees to the side where it is. Since the terminal portion 42 is a circular ring, the shape of the terminal portion 42 becomes a semicircular ring shape by folding back.

As shown in FIGS. 7A and 7B, the direction in which the half of the tip of the terminal portion 42 is folded back is such that the half of the tip of the terminal portion 42 is located on the side where the wire barrel 46 and the insulator barrel 48 are provided. It is the direction to do. However, the folding direction may be the opposite of FIGS. 7A and 7B, in which half of the tip of the terminal portion 42 is located on the side where the wire barrel 46 and the insulator barrel 48 are not provided.

As shown in FIG. 9A, one end of the conductive sheet 10 is sandwiched between the folded portions of the crimp terminal 40. The other end of the conductive sheet 10 extends in the direction along the lead wire 100 connected to the crimp terminal 40. In the following description, the orientation of the conductive sheet 10 when it is inserted into the folded-back portion is the orientation shown in FIG. 7B. That is, the surface of the conductive sheet 10 shown in FIG. 9A is the first conductive silicone rubber sheet 12. After one end of the conductive sheet 10 is inserted into the folded portion of the crimp terminal 40, pressure is applied to the folded portion, and one end of the conductive sheet 10 is fixed in the folded portion of the crimp terminal 40. As described above, the hole 44 of the terminal portion 42 can be omitted, but the presence of the hole 44 increases the force for fixing the conductive sheet 10 in the folded portion, and makes it difficult for the conductive sheet 10 to come off from the folded portion.

After this, as shown in FIG. 9B, the remaining portion of the conductive sheet 10 extending along the lead wire 100 is further folded back. The surface of the conductive sheet 10 shown in FIG. 9B is the second conductive silicone rubber sheet 14.

9 (c) shows FIG. 9 (b) upside down, and the surface of the conductive sheet 10 shown in FIG. 9 (c) is the first conductive silicon rubber sheet 12. In order to maintain the folded state, the folded portion is fixed with the tape 52.

By sandwiching the conductive sheet 10 between the crimp terminals 40 in this way, the lead wire 100 can be pulled out from the conductive sheet 10. Since the conductive sheet 10 is sandwiched in a plane by the terminal portion 42 of the crimp terminal 40, it is difficult to come off and tear even when an external force is applied.

The characteristics of the second conductive silicone rubber sheet 12 containing silver deteriorate due to oxidation. When applied to biological sensing, the second conductive silicone rubber sheet 12 is oxidized by sweat or the like. In order to prevent this, the terminal portion 42 of the crimp terminal 40 and the conductive sheet 10 may be housed in the case 202 as shown in FIG. The wire barrel 46 and insulator barrel 48 of the crimp terminal 40 are outside the case 202. The case 202 is made of a material that can adhere to the conductive sheet 10. The case 202 is provided with an opening at a position where the second conductive silicon rubber sheet 14 comes into contact with the living body, but at other places, air is prevented from coming into contact with the second conductive silicon rubber sheet 12. It is possible to prevent the second conductive silicone rubber sheet 12 from being oxidized. The electrodes shown in FIGS. 2 to 5 may also be housed in the case 202.

When the second conductive silicone rubber sheet 12 is oxidized, the color becomes dark. Therefore, the progress of oxidation can be known from the change in color. As the oxidation progresses, the characteristics deteriorate, so that a correct sensing signal cannot be obtained, and it may be necessary to replace the sensor electrode. The replacement time can be determined based on the color of the second conductive silicone rubber sheet 12. Therefore, the case 204 of FIG. 10 includes a colored region 208. The color of the colored region 208 is similar to the color of the second conductive silicone rubber sheet 12 at the time when replacement is necessary. Thereby, by comparing the color of the colored region 208 with the color of the second conductive silicone rubber sheet 12, it is possible to accurately determine the replacement time of the second conductive silicone rubber sheet 12.

[Lead wire lead-out example 6]
FIG. 11 is another example in which the crimp terminal 40 is used. In this example, the terminal portion 42 of the crimp terminal 40 is not folded back and remains flat. The second conductive silicon rubber sheet 14 of the conductive sheet 10 is connected to the lower surface (the surface where the wire barrel 46 and the insulator barrel 48 are not provided) of the terminal portion 42 of the crimp terminal 40 by a tape, an adhesive or the like (not shown). .. The terminal portion 42 of the crimp terminal 40 and the conductive sheet 10 in this state are housed in the case 204. The case 202 is made of a material that emphasizes adhesion to the conductive sheet 10 to prevent oxidation, but the case 204 is rigid for the purpose of maintaining the adhesive state between the terminal portion 42 of the crimp terminal 40 and the conductive sheet 10. Desired. As a result, the terminal portion 42 of the crimp terminal 40 and the conductive sheet 10 are electrically connected by the case 204, and the lead wire 100 is pulled out from the conductive sheet 10.

Like the case 202, the case 204 may also have a colored region 208 of a color that serves as a guideline for the replacement time of the second conductive silicone rubber sheet 14.

[Wearable device]
FIG. 12 shows a wearable device as an example of an application example of the sensor electrode. Here, the wearable device is a glasses-type wearable device 212, and a sensor electrode having any structure described above is attached to a nose pad in contact with the nose. The sensor electrodes 220a and 220b are attached to the left nose pad 214, and the sensor electrodes 220c and 220d are attached to the right nose pad 216. Leads drawn from the sensor electrodes 220a, 220b, 220c, 220d are connected to a processor 226 provided on the left temple (or the right temple). The processor 226 has a difference between the outputs of the sensor electrodes 220a and 220b of the left nose pad 214, a difference between the outputs of the sensor electrodes 220c and 220d of the right nose pad 214, and the sensor electrodes 220b and 220d (or 220a and 220c) of the left and right nose pads. ) Is obtained, and the electro-oculography is obtained from the three differences, and the eye movement can be determined. The sensor electrode can be applied not only to ocular potential but also to sensing myoelectric potential, brain wave and the like.

The application example of the sensor electrode is not limited to the biological sensor, and can be applied to any sensor. Even when applied to a biosensor, it can be applied not only to wearable devices but also to such devices.

The present invention is not limited to the above-described embodiment as it is, and at the implementation stage, the components can be modified and embodied within a range that does not deviate from the gist thereof. In addition, various inventions can be formed by an appropriate combination of the plurality of components disclosed in the above-described embodiment. For example, some components may be removed from all the components shown in the embodiments. Further, the components of different embodiments may be combined as appropriate.

10 ... Conductive sheet, 12 ... 1st conductive silicone rubber sheet, 14 ... 1st conductive silicone rubber sheet, 40 ... Crimping terminal, 42 ... Terminal part, 44 ... Wire barrel, 46 ... Insulator barrel, 100 ... Lead wire , 202, 204 ... Case.

Claims (9)

A conductive sheet made by laminating a first conductive silicone rubber sheet containing carbon and a second conductive silicone rubber sheet containing silver,
Lead wire and
A terminal member that electrically connects the lead wire to the conductive sheet,
Equipped with
The terminal member includes a crimping portion into which the wire of the lead wire is inserted and a flat plate portion integrally formed with the crimping portion.
The flat plate portion comprises a first portion and a second portion other than the first portion.
The first portion is folded so that the first surface of the first portion faces the first surface of the second portion.
One end of the conductive sheet is connected to the terminal member in a state of being sandwiched between the first surface of the folded first portion and the first surface of the second portion. Being done
A portion of the conductive sheet other than the one end portion is an electrode that is folded back so as to cover a second surface of the first portion. At one end of the conductive sheet, the second conductive silicone rubber sheet comes into contact with the first surface of the second portion, and the first conductive silicone rubber sheet is the first portion. The electrode according to claim 1, which is sandwiched between the first portion and the second portion so as to be in contact with the first surface. Further provided with a case for accommodating the terminal member and the conductive sheet,
The electrode according to claim 1 or 2, wherein the case has at least a part of a portion facing the second conductive silicon rubber sheet opened. The electrode according to claim 3, wherein the case includes a region colored in a color similar to the color of the second conductive silicon rubber sheet at a time when replacement is required. The first member for holding the electrode according to any one of claims 1 to 4 is provided.
The first member is a wearable device that holds the electrodes so that the second conductive silicone rubber sheet comes into contact with the skin. A conductive sheet made by laminating a first conductive silicone rubber sheet containing carbon and a second conductive silicone rubber sheet containing silver,
Lead wire and
A terminal member that electrically connects the lead wire to the conductive sheet,
It is a manufacturing method of an electrode provided with
Fixing the lead wire to the crimp portion of the terminal member,
The first portion of the flat plate portion of the terminal member integrally formed with the crimping portion, the first surface of the first portion is a second portion of the flat plate portion other than the first portion. Fold it back to face the first surface ,
One end of the conductive sheet is connected to the terminal member by sandwiching it between the first surface of the folded first portion and the first surface of the second portion.
A manufacturing method in which a portion other than the one end portion of the conductive sheet is folded back so as to cover the second surface of the first portion. The second conductive silicon rubber sheet comes into contact with the first surface of the second portion of the one end portion of the conductive sheet, and the first conductive silicon rubber sheet is the said portion of the first portion. The manufacturing method according to claim 6, wherein the first portion and the second portion are sandwiched so as to be in contact with the first surface. The manufacturing method according to claim 6 or 7, wherein the terminal member and the conductive sheet are housed in a case in which at least a part of a portion facing the second conductive silicon rubber sheet is open. The manufacturing method according to claim 8, wherein the case includes a region colored in a color similar to the color of the second conductive silicone rubber sheet at a time when replacement is required.

Images