JP2022018263A - Electrode for electroencephalogram measurement and electroencephalograph - Google Patents

Abstract

To provide a technique of improving electroencephalogram acquisition performance by improving a performance of pushing the hair aside.SOLUTION: An electrode for electroencephalographic detection 50 of an electroencephalogram electrode unit of an electroencephalograph comprises: a columnar base 51 (a support body); a plurality of protrusions 60 extending from the circular end face of the base 51; and electrodes 80 provided at the protrusions 60. Each of the protrusions 60 has a shape obtained by obliquely cutting off the tip portion of a cone, and the protrusions 60 are arranged annularly on the base 51 without interfering with each other.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electroencephalogram measuring electrode and an electroencephalogram measuring device.

Various developments have been made on electrodes for EEG detection. As this kind of technique, for example, the technique described in Patent Document 1 is known. The electroencephalogram measurement electrode (electroencephalogram detection electrode) disclosed in Patent Document 1 is provided at a base portion, a protrusion made of rubber provided so as to project from the base portion, and the tip of the protrusion, and the brain wave. It is provided with a contact portion made of metal, which is electrically connected to the outside of the measurement electrode and comes into contact with the scalp when measuring the electroencephalogram.

Japanese Patent No. 5842198

In general, the larger the contact area between the EEG sensor and the scalp, the lower the contact resistance and the better the EEG acquisition. At present, the hair is an obstacle when it comes into contact with the scalp, and there is a demand for improvement in the hair squeezing performance. In the technique disclosed in Patent Document 1, a technique has been proposed in which a protruding portion provided with a contact portion penetrates between the hairs to facilitate contact with the scalp, but the hair squeezing performance is fully considered. It was not done and another technology was required.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a technique for improving hair squeezing performance and improving electroencephalogram acquisition performance.

According to the present invention
With a columnar base,
A plurality of protrusions extending from the circular end face of the base,
The electrode portion provided on the protrusion and the electrode portion
Have,
The protrusion has a shape in which the tip of the cone is cut off at an angle.
The plurality of protrusions do not interfere with each other and are arranged in an annular shape on the base.
Electrodes for electroencephalogram measurement are provided.
According to the present invention
With a columnar base,
A plurality of protrusions extending from the circular end face of the base,
The electrode portion provided on the protrusion and the electrode portion
Have,
The protrusion has a shape in which the tip of the cone is cut off at an angle.
The plurality of protrusions have a region where the cones overlap and are arranged in an annular shape at the base.
Electrodes for electroencephalogram measurement are provided.
According to the present embodiment, an electroencephalogram measuring device including the above-mentioned electroencephalogram measuring electrode is provided.

According to the present invention, it is possible to provide a technique for improving the hair squeezing performance and improving the electroencephalogram acquisition performance.

It is a figure which shows typically the electroencephalogram measuring apparatus in the state attached to the human head which concerns on 1st Embodiment. It is a perspective view of the frame which concerns on 1st Embodiment. It is a front view of the electroencephalogram electrode unit which concerns on 1st Embodiment. It is a perspective view of the electroencephalogram detection electrode which concerns on 1st Embodiment. It is a figure which looked at one protrusion with respect to 1st Embodiment from the side (circumferential direction side). It is a figure which looked at one protrusion with respect to 1st Embodiment from the center side. FIG. 6 is a diagram showing the protrusions shown in FIG. 6 according to the first embodiment, in which the shape of the cone that is the basis of the shape of the protrusions is superimposed. It is a top view of the electroencephalogram detection electrode which concerns on 1st Embodiment. It is a figure explaining the relationship between the height H of the protrusion and the angle α of the apex of the cone which became the origin of the protrusion, which concerns on embodiment. It is a perspective view of the electroencephalogram detection electrode which concerns on 2nd Embodiment. It is a figure which looked at the two protrusions from the center side which concerns on 2nd Embodiment. As an example of the shape of the protrusion according to the embodiment, it is a figure which showed the list of the side view which looked at the protrusion from the center side about the shape in the case of height H = 6mm.

<< First Embodiment >>
<Overview>
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing an electroencephalogram measuring device 1 in a state of being attached to a human head 99.
The electroencephalogram measuring device 1 is attached to a human head 99, detects an electroencephalogram as a potential fluctuation from a living body, and outputs the detected electroencephalogram to a brain wave display device (not shown). The electroencephalogram display device acquires the electroencephalogram detected by the electroencephalogram measuring device 1, displays it on a monitor, saves data, and performs well-known electroencephalogram analysis processing.

<Structure of EEG measuring device 1>
As shown in FIG. 1, the electroencephalogram measuring device 1 has a plurality of electroencephalogram electrode units 10 and a frame 20. In this embodiment, the electroencephalogram electrode units 10 are provided for 5 channels (5).

<Structure of frame 20>
FIG. 2 shows a perspective view of the frame 20. The frame 20 is made of a hard member such as a polyamide resin and is formed in a band shape and curved so as to follow the shape of the human head 99.

The frame 20 is provided with five electrode unit mounting portions 21 as openings for mounting the electroencephalogram electrode unit 10. The position of the electrode unit mounting portion 21 (that is, the mounting position of the electroencephalogram electrode unit 10) corresponds to the positions of T3, C3, Cz, C4, and T4 in the international 10-20 electrode arrangement method.

The inner peripheral surface of the electrode unit mounting portion 21 is threaded, and the electroencephalogram electrode unit 10 is screwed by the threaded portion 13 (see FIG. 3) of the body portion 11. By adjusting the amount of screwing the electroencephalogram electrode unit 10, the amount of protrusion toward the head 99 side is adjusted, and the contact amount and contact pressure with the head 99 (scalp) are controlled. In addition, the hair is scraped by the operation of screwing the electroencephalogram electrode unit 10. At this time, the blade shape of the protrusion 60 of the electroencephalogram detection electrode 50 (electroencephalogram measurement electrode) described later improves the hair sorting performance.

<Structure of EEG electrode unit 10>
FIG. 3 shows a front view of the electroencephalogram electrode unit 10. The electroencephalogram electrode unit 10 has a substantially columnar body portion 11 and an electroencephalogram detection electrode 50 provided on one end side (lower side in the figure) thereof.

The body portion 11 integrally includes a signal extraction portion 12, a screwing portion 13, and an electrode fixing portion 14.
The threaded portion 13 has a shape spirally formed on a side surface of a cylindrical shape. A signal extraction section 12 is provided at one end (upper side in the figure) of the threading section 13. The signal extraction unit 12 is provided with a signal output terminal, and when the electroencephalogram electrode unit 10 is screwed to the frame 20, it is operated by an operator using a predetermined jig as needed. At the other end (lower side in the figure) of the threaded portion 13, a columnar electrode fixing portion 14 having a diameter smaller than that of the screwed portion 13 is provided. An electroencephalogram detection electrode 50 is attached to the electrode fixing portion 14.

<Structure of electrode 50 for brain wave detection>
FIG. 4 is a perspective view of the electroencephalogram detection electrode 50. FIG. 5 is a view of one protrusion 60 viewed from the side (circumferential direction side). FIG. 6 is a view of one protrusion 60 viewed from the center 59 side of the protrusion forming surface 52. FIG. 7 is a diagram showing the protrusion 60 shown in FIG. 6 by superimposing the shape of a cone (here, a cone) which is the origin of the shape of the protrusion 60. FIG. 8 is a plan view of the electroencephalogram detection electrode 50, and shows only the protrusion bottom surface 63 for the protrusion 60.

The electroencephalogram detection electrode 50 has a base 51, a protrusion 60, and an electrode 80. The base portion 51 and the protrusion portion 60 are integrally provided by a rubber-like elastic body. The specific material of the elastic body will be described later. The base 51 and the protrusion 60 are not limited to the one provided integrally, but may be a structure in which the base 51 and the protrusion 60 are assembled separately by an adhesive or a fitting structure. When the base 51 and the protrusion 60 are rubber-like elastic bodies having a hardness of 25 or more and 35 or less, the contact pressure can be properly maintained when the protrusion 60 is pressed against the head 99 of the subject. In addition, it is possible to prevent the subject from being uncomfortable because the pressing pressure is too strong.

The base 51 has a substantially cylindrical shape, with one end having a circular protrusion forming surface 52 and the other end having a circular mounting surface 53. The mounting surface 53 is attached to the electrode fixing portion 14 of the body portion 11 with an adhesive or the like. As the fixing structure of the mounting surface 53 and the electrode fixing portion 14, a fitting structure having an uneven shape may be used.

A plurality of protrusions 60 are provided on the protrusion forming surface 52 in a radial pattern (or an annular shape) from the center 59 of the circular shape of the protrusion forming surface 52. In the present embodiment, the eight protrusions 60 are provided so as to extend integrally from the protrusion forming surface 52 at intervals of 45 degrees in the circumferential direction and separated by a predetermined width.

<Structure of protrusion 60>
The protrusion 60 of the present embodiment has a protrusion main body 61 and an electrode forming surface 62. Specifically, the protrusion 60 is formed based on a cone. That is, the protrusion 60 has a protrusion main body 61 having a shape in which the tip portion of the cone is diagonally cut off, and an electrode forming surface 62 in which the shape of the cut portion is an ellipsoidal surface. The electrode portion 80 is provided on the elliptical electrode forming surface 62. Further, in the elliptical shape, the normal line (perpendicular line) at the center of the ellipse faces the perpendicular line (that is, the central axis L) of the center 59 of the base 51. When the electrode forming surface 62 has an elliptical outer shape and the outer shell is curved, the hair can be smoothly separated when the electroencephalogram detection electrode 50 is pressed against the scalp. The protrusion 60 may be formed based on a pyramid, and in that case, the electrode forming surface 62 is not an ellipsoidal surface but a polygonal surface.

The protrusion 60 extends diagonally so that the original cone (here, the cone) tilts outward (outside in the radial direction). More specifically, as shown in FIG. 5, the region of the outermost side surface 64 with respect to the base 51 in top view, that is, the outermost side surface line 64a (the line corresponding to the generatrix of the cone) is the electroencephalogram detection electrode 50. It is inclined outward with respect to the perpendicular line (central axis L) extending from. In other words, the angle θ formed by the outermost side surface line 64a and the protrusion forming surface 52 is smaller than 90 degrees. Further, the tip portion 65 of the protrusion 60 is located closer to the center 59 than the side surface 54 of the base 51.

A substantially flat electrode forming surface 62 (contact surface) is provided at the tip portion of the protrusion 60. The electrode portion 80 is provided on the electrode forming surface 62. The electrode forming surface 62 has a shape that gradually tapers from the position of the maximum width toward the tip end side.

With such a shape, the protrusion 60 is an electrode as the contact pressure with the scalp increases when the electroencephalogram measuring device 1 is attached to the head 99 and the electroencephalogram electrode unit 10 is pressed against the scalp. The contact region of the forming surface 62 (that is, the electrode portion 80) is deformed so as to gradually increase. Therefore, even if the hair gets into the space between the electrode portion 80 of the electroencephalogram detection electrode 50 and the scalp, the contact area increases, so that the influence of the hair can be reduced. Further, since the protrusion 60 is elastically deformed, it is possible to suppress the subject from feeling unpleasant. Furthermore, by deforming the protrusion 60 so that the contact area gradually increases, the hair can be smoothly separated, and the hair intervening between the electrode forming surface 62 (that is, the electrode portion 80) and the scalp can be formed. Can be reduced.

The cone on which the protrusion 60 is based may be symmetrical in the width direction. That is, when the protrusion 60 is viewed from the central axis L side, in other words, when viewed from the outside in the radial direction, the protrusion 60 is provided in a straight radial pattern without tilting in the circumferential direction (lateral direction). With such a configuration, the contact between the electrode portion 80 and the scalp can be stabilized regardless of the shape of the head 99 and the amount of hair.

The protrusion 60 may be asymmetric in the width direction. That is, the protrusion 60 may be provided so as to be inclined diagonally so as to fall in the circumferential direction. According to such a configuration, when there is a lot of hair or when there is a peculiarity in the hair, the hair can be separated, and when a general-purpose shape cannot be used, that is, the cone is formed in the width direction as described above. Stable electroencephalogram measurement is possible even when the electroencephalogram detection electrode 50 having a symmetrical configuration cannot handle the problem.

<Parameters such as dimensions of protrusion 60>
First, parameters related to the dimensions of the electroencephalogram detection electrode 50 and the arrangement of the protrusions 60 will be described.

As shown in FIG. 8, the outer diameter of the electroencephalogram detection electrode 50, that is, the diameter d0 of the protrusion forming surface 52 (base 51) is, for example, 13 mm or more and 16 mm or less.
When the diameter of the circular shape C1 formed by connecting the center points of the protrusion bottom surface 63 of the protrusion 60 is d1, the diameter d1 is, for example, 8 mm or more and 12 mm or less.
The outer diameter of the protrusion bottom surface 63 of the protrusion 60, that is, the diameter d2 of the circle exhibited by the bottom surface of the cone is, for example, 2 mm or more and 3.5 or less mm.
When the number of protrusions 60 is n, the predetermined pitch p1 represented by the following formula (1a) is, for example, 0.5 mm or more and 5 mm or less.
p1 = (π ・ d1-n ・ d2) / n ... Equation (1a)
By setting such a pitch p1, when the electrode forming surface 62 (electrode portion 80) is pressed against the scalp, the hair is accommodated between the protrusions 60, and the electrode forming surface 62 (electrode portion 80) and the scalp are accommodated. Stable brain wave measurement can be realized by suppressing the intervention of hair between them. In particular, good EEG measurement is possible even when there are many or thick hairs. Even if the pitch p1 is less than the lower limit (0.5 mm), if the hair is not particularly large or the hair is thin, the hair can be accommodated between the protrusions 60, and appropriate brain wave measurement can be performed. Can be done.

The angle α of the tip (vertex) of the cone that is the source of the protrusion 60 is 7 degrees or more and 25 degrees or less. Specifically, when a cone whose tip is not cut off is orthographically projected from the central axis L side of the base 51 in the outward radial direction, the angle α of the projected figure at the apex is 15 degrees or more and 28 degrees or less. It is a range.
As described above, when the tip of the protrusion 60 is tapered, especially when the angle α of the original cone is in the range of 15 degrees or more and 28 degrees or less, the electroencephalogram detection electrode 50 smoothly separates the hair. Can be done.

The area S of the electrode forming surface 62 (which is also the area of the electrode portion 80) is 5 mm ² or more and 10 mm ² or less.
By setting the electrode portion 80 within the range of the above-mentioned area S, a sufficient contact area with the scalp can be secured. That is, due to the tapered shape described above, when pressed against the scalp, the contact area is deformed so as to gradually increase, and the hair can be scraped off.

The horizontal maximum width R1 of the electrode forming surface 62 (here, the length of the minor axis of the ellipse) and the distance X of the straight line drawn from the center position P0 of the maximum width to the position Pz on the most tip side (here, the length of the ellipse). The ratio R2 / R1 to the horizontal width R2 at the position of 0.1X on the tip side when 1/2) of the length of the shaft is divided into 10 equal parts is 0.1 or more and 0.5 or less.
Since the electrode forming surface 62 of the protrusion 60 has the tapered shape as described above, when pressed against the scalp, the electrode forming surface 62 is deformed so as to gradually increase the contact area, and the hair can be scraped off. can.

The height h of the protrusion 60 is 2 mm or more and 10 mm or less, preferably 2.5 mm or more and 9 mm or less, and more preferably 3 mm or more and 8 mm or less.
With such a height, when it comes into contact with the head 99, it is appropriately deformed and the contact area with the scalp can be maintained satisfactorily. Further, even when a large number of protrusions 60 are provided so that the adjacent protrusions 60 do not overlap with each other, appropriate deformation can be obtained when pressed against the scalp, and the contact of the electrode forming surface 62 (that is, the electrode portion 80) is obtained. A good area can be secured.

With reference to FIG. 9, the height H of the protrusion 60 and the angle α of the apex of the cone (for example, the cone on which the protrusion 60 is based) will be described. FIG. 9 is a diagram illustrating the relationship between the height H of the protrusion 60 and the angle α of the apex of the cone on which the protrusion 60 is based.
The angle α of the apex is a function of the diameter D1 of the cone (the bottom surface 63 of the protrusion 60), the diameter D2 of the cone at the position of the tip portion 65 of the protrusion 60, and the height H of the protrusion 60, that is. It can be expressed by the following equation (2).
tan (α / 2) = (D1-D2) / 2H ... Equation (2a)

The value of tan (α / 2) represented by the formula (2a) is 0.15 or more and 0.25 or less.
If the value of tan (α / 2) is larger than the above range, the ability to separate hair tends to deteriorate. Further, if the value of tan (α / 2) is smaller than the above range, it will be greatly deformed at a low load (that is, under the condition that the force pressing against the scalp is small), and the tip portion 65 of the protrusion 60 will float. It may not fit properly on the scalp due to the phenomenon. Therefore, by setting tan (α / 2) in the above range, it is possible to strike a balance between the hair separation performance and ensuring an appropriate contact state with the scalp.

<Structure of signal line 69>
Inside the protrusion 60, a conductive signal line 69 (shown by a broken line in FIG. 5) connected to the electrode portion 80 is provided. The signal line 69 may adopt various arrangement structures as long as it conducts the inside of the protrusion 60. For example, the tip of the signal line 69 may have any of a protruding structure, a structure that is substantially on the same surface, and a buried structure with respect to the electrode forming surface 62 of the protrusion 60. From the viewpoint of connection stability with the electrode portion 80, a protruding structure may be used. The protruding portion at the tip of the signal line 69 is partially or wholly covered with the electrode portion 80.

As the protruding structure at the tip of the signal line 69, a structure without folding back, with folding back, and winding around the surface of the tip end portion of the protruding portion 60 can be adopted. Further, the extending direction of the signal line 69 is not particularly limited, and may not coincide with the perpendicular line extending from the protrusion forming surface 52 and may be inclined with respect to the perpendicular line.

<Material of electrode 50 for brain wave detection>
The material of the electroencephalogram detection electrode 50 will be described. The electroencephalogram detection electrode 50 is a rubber-like elastic body as described above. The rubber-like elastic body is specifically a rubber or a thermoplastic elastomer (also simply referred to as "elastomer (TPE)"). Examples of the rubber include silicone rubber. Examples of the thermoplastic elastomer include styrene-based TPE (TPS), olefin-based TPE (TPO), vinyl chloride-based TPE (TPVC), urethane-based TPE (TPU), ester-based TPE (TPEE), and amide-based TPE (TPAE). There is.

When the electroencephalogram detection electrode 50 is made of silicone rubber, the hardness of the type A durometer on the surface (projection 60 or base 51) of the electroencephalogram detection electrode 50 measured according to JIS K 6253 (1997) at 37 ° C. The rubber hardness A is, for example, 15 or more and 55 or less, and more preferably 25 or more and 35 or less.

Here, the silicone rubber-based curable composition will be described.
The silicone rubber can be composed of a cured product of a silicone rubber-based curable composition. The curing step of the silicone rubber-based curable resin composition is, for example, heating at 100 to 250 ° C. for 1 to 30 minutes (primary curing) and then post-baking at 100 to 200 ° C. for 1 to 4 hours (secondary curing). It is done by.

The insulating silicone rubber is a silicone rubber that does not contain a conductive filler, and the conductive silicone rubber is a silicone rubber that contains a conductive filler.

The silicone rubber-based curable composition according to the present embodiment can contain a vinyl group-containing organopolysiloxane (A). The vinyl group-containing organopolysiloxane (A) is a polymer which is a main component of the silicone rubber-based curable composition of the present embodiment.

The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may contain the same kind of vinyl group-containing linear organopolysiloxane. The vinyl group-containing linear organopolysiloxane of the same type may contain at least the same vinyl group as the functional group and may have a linearity, and the vinyl group amount, the molecular weight distribution, or the addition amount thereof in the molecule may be. It may be different.
The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may further contain different vinyl group-containing organopolysiloxanes.

The vinyl group-containing organopolysiloxane (A) can include a vinyl group-containing linear organopolysiloxane (A1) having a linear structure.

The vinyl group-containing linear organopolysiloxane (A1) has a linear structure and contains a vinyl group, and the vinyl group serves as a cross-linking point at the time of curing.

The content of the vinyl group of the vinyl group-containing linear organopolysiloxane (A1) is not particularly limited, but is preferably, for example, having two or more vinyl groups in the molecule and 15 mol% or less. , 0.01-12 mol%, more preferably. As a result, the amount of vinyl groups in the vinyl group-containing linear organopolysiloxane (A1) is optimized, and a network with each component described later can be reliably formed. In the present embodiment, "to" means to include the numerical values at both ends thereof.

In the present specification, the vinyl group content is the mol% of the vinyl group-containing siloxane unit when all the units constituting the vinyl group-containing linear organopolysiloxane (A1) are 100 mol%. .. However, it is considered that there is one vinyl group for each vinyl group-containing siloxane unit.

The degree of polymerization of the vinyl group-containing linear organopolysiloxane (A1) is not particularly limited, but is preferably in the range of, for example, preferably about 1000 to 10000, and more preferably about 2000 to 5000. The degree of polymerization can be determined, for example, as the polystyrene-equivalent number average degree of polymerization (or number average molecular weight) in GPC (gel permeation chromatography) using chloroform as a developing solvent.

Further, the specific gravity of the vinyl group-containing linear organopolysiloxane (A1) is not particularly limited, but is preferably in the range of about 0.9 to 1.1.

By using a vinyl group-containing linear organopolysiloxane (A1) having a degree of polymerization and specific gravity within the above range, the silicone rubber obtained has heat resistance, flame retardancy, chemical stability, etc. Can be improved.

The vinyl group-containing linear organopolysiloxane (A1) preferably has a structure represented by the following formula (1).

In formula (1), R ¹ is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an alkenyl group, an aryl group, or a hydrocarbon group in which these are combined. Examples of the alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable. Examples of the alkenyl group having 1 to 10 carbon atoms include a vinyl group, an allyl group, a butenyl group and the like, and among them, a vinyl group is preferable. Examples of the aryl group having 1 to 10 carbon atoms include a phenyl group and the like.

Further, R ² is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an alkenyl group, an aryl group, or a hydrocarbon group in which these are combined. Examples of the alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable. Examples of the alkenyl group having 1 to 10 carbon atoms include a vinyl group, an allyl group, and a butenyl group. Examples of the aryl group having 1 to 10 carbon atoms include a phenyl group.

Further, R ³ is a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, an aryl group, or a hydrocarbon group in which these are combined. Examples of the alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable. Examples of the aryl group having 1 to 8 carbon atoms include a phenyl group.

Further, examples of the substituent of R ¹ and R ² in the formula (1) include a methyl group, a vinyl group and the like, and examples of the substituent of R ³ include a methyl group and the like.

In the equation (1), the plurality of R ^1s are independent of each other and may be different from each other or may be the same. The same applies to R ² and R ³ .

Further, m and n are the number of repeating units constituting the vinyl group-containing linear organopolysiloxane (A1) represented by the formula (1), m is an integer of 0 to 2000, and n is 1000 to 10000. Is an integer of. m is preferably 0 to 1000, and n is preferably 2000 to 5000.

Moreover, as a specific structure of the vinyl group-containing linear organopolysiloxane (A1) represented by the formula (1), for example, the one represented by the following formula (1-1) can be mentioned.

In formula (1-1), R ¹ and R ² are each independently a methyl group or a vinyl group, and at least one of them is a vinyl group.

Further, the vinyl group-containing linear organopolysiloxane (A1) contains a first vinyl group having a vinyl group content of 2 or more in the molecule and 0.4 mol% or less. It contains a linear organopolysiloxane (A1-1) and a second vinyl group-containing linear organopolysiloxane (A1-2) having a vinyl group content of 0.5 to 15 mol%. It is preferable to have it. As raw rubber which is a raw material of silicone rubber, a first vinyl group-containing linear organopolysiloxane (A1-1) having a general vinyl group content and a second vinyl group-containing direct having a high vinyl group content. By combining with a chain organopolysiloxane (A1-2), the vinyl group can be unevenly distributed, and the cross-linking density can be more effectively formed in the cross-linking network of the silicone rubber. As a result, the tear strength of the silicone rubber can be increased more effectively.

Specifically, as the vinyl group-containing linear organopolysiloxane (A1), for example, in the above formula (1-1), a unit in which R ¹ is a vinyl group and / or a unit in which R ² is a vinyl group is used. , A first vinyl group-containing linear organopolysiloxane (A1-1) having two or more in the molecule and containing 0.4 mol% or less, and a unit in which R ¹ is a vinyl group and / or R. It is preferable to use a second vinyl group-containing linear organopolysiloxane (A1-2) containing 0.5 to 15 mol% of the unit in which ² is a vinyl group.

Further, the first vinyl group-containing linear organopolysiloxane (A1-1) preferably has a vinyl group content of 0.01 to 0.2 mol%. Further, the vinyl group-containing linear organopolysiloxane (A1-2) preferably has a vinyl group content of 0.8 to 12 mol%.

Further, when the first vinyl group-containing linear organopolysiloxane (A1-1) and the second vinyl group-containing linear organopolysiloxane (A1-2) are blended in combination (A1-1). The ratio of and (A1-2) is not particularly limited, but for example, the weight ratio of (A1-1) :( A1-2) is preferably 50:50 to 95: 5, and 80:20 to 90: It is more preferably 10.

The first and second vinyl group-containing linear organopolysiloxanes (A1-1) and (A1-2) may be used alone or in combination of two or more. good.

Further, the vinyl group-containing organopolysiloxane (A) may contain a vinyl group-containing branched organopolysiloxane (A2) having a branched structure.

<< Organohydrogen Polysiloxane (B) >>
The silicone rubber-based curable composition of the present embodiment may contain a cross-linking agent. The cross-linking agent can include organohydrogenpolysiloxane (B).
The organohydrogenpolysiloxane (B) is classified into a linear organohydrogenpolysiloxane (B1) having a linear structure and a branched organohydrogenpolysiloxane (B2) having a branched structure. Either one or both can be included.

The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may contain the same type of cross-linking agent. The cross-linking agent of the same type may have at least a common structure such as a linear structure or a branched structure, may contain a molecular weight distribution in the molecule or a different functional group, and the addition amount thereof is different. You may.
The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may further contain different cross-linking agents.

The linear organohydrogenpolysiloxane (B1) has a linear structure and a structure (≡Si—H) in which hydrogen is directly bonded to Si, and is a vinyl group-containing organopolysiloxane (A). In addition to the vinyl group, it is a polymer that undergoes a hydrosilylation reaction with the vinyl group contained in the components contained in the silicone rubber-based curable composition to crosslink these components.

The molecular weight of the linear organohydrogenpolysiloxane (B1) is not particularly limited, but for example, the weight average molecular weight is preferably 20000 or less, and more preferably 1000 or more and 10000 or less.

The weight average molecular weight of the linear organohydrogenpolysiloxane (B1) can be measured, for example, by polystyrene conversion in GPC (gel permeation chromatography) using chloroform as a developing solvent.

Further, the linear organohydrogenpolysiloxane (B1) is usually preferably one having no vinyl group. This makes it possible to accurately prevent the cross-linking reaction from proceeding in the molecule of the linear organohydrogenpolysiloxane (B1).

As the linear organohydrogenpolysiloxane (B1) as described above, for example, one having a structure represented by the following formula (2) is preferably used.

In formula (2), ^R4 is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an alkenyl group, an aryl group, a hydrocarbon group combining these, or a hydride group. Examples of the alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable. Examples of the alkenyl group having 1 to 10 carbon atoms include a vinyl group, an allyl group, a butenyl group and the like. Examples of the aryl group having 1 to 10 carbon atoms include a phenyl group.

Further, R5 is a substituted or unsubstituted alkyl group having 1 to ¹⁰ carbon atoms, an alkenyl group, an aryl group, a hydrocarbon group combining these, or a hydride group. Examples of the alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group and a propyl group, and among them, a methyl group is preferable. Examples of the alkenyl group having 1 to 10 carbon atoms include a vinyl group, an allyl group, a butenyl group and the like. Examples of the aryl group having 1 to 10 carbon atoms include a phenyl group.

In the equation (2), the plurality of R ^4s are independent of each other and may be different from each other or may be the same. The ^same applies to R5. However, of the plurality of R ⁴ and R ⁵ , at least two or more are hydride groups.

Further, R ⁶ is a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, an aryl group, or a hydrocarbon group in which these are combined. Examples of the alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable. Examples of the aryl group having 1 to 8 carbon atoms include a phenyl group. The plurality of ^R6s are independent of each other and may be different from each other or may be the same.

Examples of the substituent of R ⁴ , R ⁵ , and R ⁶ in the formula (2) include a methyl group and a vinyl group, and a methyl group is preferable from the viewpoint of preventing an intramolecular cross-linking reaction.

Further, m and n are the number of repeating units constituting the linear organohydrogenpolysiloxane (B1) represented by the formula (2), where m is an integer of 2 to 150 and n is an integer of 2 to 150. Is. Preferably, m is an integer of 2 to 100 and n is an integer of 2 to 100.

The linear organohydrogenpolysiloxane (B1) may be used alone or in combination of two or more.

Since the branched organohydrogenpolysiloxane (B2) has a branched structure, it forms a region having a high crosslink density and is a component that greatly contributes to the formation of a dense structure having a crosslink density in the silicone rubber system. Further, like the linear organohydrogenpolysiloxane (B1), it has a structure (≡Si—H) in which hydrogen is directly bonded to Si, and in addition to the vinyl group of the vinyl group-containing organopolysiloxane (A), silicone. It is a polymer that hydrosilylates with the vinyl group of the component contained in the rubber-based curable composition and crosslinks these components.

The specific gravity of the branched organohydrogenpolysiloxane (B2) is in the range of 0.9 to 0.95.

Further, the branched organohydrogenpolysiloxane (B2) is usually preferably one having no vinyl group. This makes it possible to accurately prevent the cross-linking reaction from proceeding in the molecule of the branched organohydrogenpolysiloxane (B2).

The branched organohydrogenpolysiloxane (B2) is preferably represented by the following average composition formula (c).

Average composition formula (c)
(H _a (R ⁷ ) _3-a SiO _1/2 ) _m (SiO _4/2 ) _n
(In the formula (c), R ⁷ is a monovalent organic group, a is an integer in the range of 1 to 3, m is _a number of Ha (R ⁷ ) _3-a SiO _1/2 units, and n is SiO _{4 /.} It is a number of ₂ units)

In formula (c), R ⁷ is a monovalent organic group, preferably a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, an aryl group, or a hydrocarbon group in combination thereof. Examples of the alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable. Examples of the aryl group having 1 to 10 carbon atoms include a phenyl group.

In the formula (c), a is the number of hydride groups (hydrogen atoms directly bonded to Si), and is an integer in the range of 1 to 3, preferably 1.

Further, in the formula ( _c ), m is the number of Ha (R ⁷ ) _3-a SiO _1/2 unit, and n is the number of SiO _4/2 unit.

The branched organohydrogenpolysiloxane (B2) has a branched structure. The linear organohydrogenpolysiloxane (B1) and the branched organohydrogenpolysiloxane (B2) differ in that their structure is linear or branched, and the Si is the same as when the number of Si is 1. The number of alkyl groups R to be bonded (R / Si) is 1.8 to 2.1 for the linear organohydrogenpolysiloxane (B1) and 0.8 to 1 for the branched organohydrogenpolysiloxane (B2). It is in the range of 0.7.

Since the branched organohydrogenpolysiloxane (B2) has a branched structure, for example, the residual amount when heated to 1000 ° C. at a heating rate of 10 ° C./min under a nitrogen atmosphere is 5% or more. Will be. On the other hand, since the linear organohydrogenpolysiloxane (B1) is linear, the amount of residue after heating under the above conditions is almost zero.

Further, specific examples of the branched organohydrogenpolysiloxane (B2) include those having a structure represented by the following formula (3).

In formula (3), R ⁷ is a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms, an aryl group, or a hydrocarbon group in combination thereof, or a hydrogen atom. Examples of the alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, a propyl group and the like, and among them, a methyl group is preferable. Examples of the aryl group having 1 to 8 carbon atoms include a phenyl group. Examples of the substituent of R ⁷ include a methyl group and the like.

In the equation (3), the plurality of R ^7s are independent of each other and may be different from each other or may be the same.

Further, in the equation (3), "-O-Si≡" indicates that Si has a branched structure that spreads three-dimensionally.

The branched organohydrogenpolysiloxane (B2) may be used alone or in combination of two or more.

Further, in the linear organohydrogenpolysiloxane (B1) and the branched organohydrogenpolysiloxane (B2), the amount of hydrogen atoms (hydride groups) directly bonded to Si is not particularly limited. However, in the silicone rubber-based curable composition, the linear organohydrogenpolysiloxane (B1) and the branched organohydrogenpoly are added to 1 mol of the vinyl group in the vinyl group-containing linear organopolysiloxane (A1). The total amount of hydride groups of siloxane (B2) is preferably 0.5 to 5 mol, more preferably 1 to 3.5 mol. This ensures that a crosslinked network is formed between the linear organohydrogenpolysiloxane (B1) and the branched organohydrogenpolysiloxane (B2) and the vinyl group-containing linear organopolysiloxane (A1). Can be made to.

<< Silica particles (C) >>
The silicone rubber-based curable composition according to the present embodiment contains a non-conductive filler. The non-conductive filler may contain silica particles (C), if necessary. This makes it possible to improve the hardness and mechanical strength of the elastomer.

The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may contain the same kind of non-conductive filler. The non-conductive filler of the same type may have at least a common constituent material, and may differ in particle size, specific surface area, surface treatment agent, or addition amount thereof.
The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may further contain different silane coupling agents.

The silica particles (C) are not particularly limited, but for example, fumed silica, calcined silica, precipitated silica and the like are used. These may be used alone or in combination of two or more.

For example, the specific surface area of the silica particles (C) by the BET method is preferably, for example, 50 to 400 m ² / g, and more preferably 100 to 400 m ² / g. The average primary particle size of the silica particles (C) is preferably, for example, 1 to 100 nm, and more preferably about 5 to 20 nm.

By using the silica particles (C) within the range of the specific surface area and the average particle size, it is possible to improve the hardness and mechanical strength of the formed silicone rubber, particularly the tensile strength.

<< Silane Coupling Agent (D) >>
The silicone rubber-based curable composition of the present embodiment can contain a silane coupling agent (D).
The silane coupling agent (D) can have a hydrolyzable group. The hydrolyzing group is hydrolyzed by water to become a hydroxyl group, and this hydroxyl group undergoes a dehydration condensation reaction with the hydroxyl group on the surface of the silica particles (C), whereby the surface of the silica particles (C) can be modified.

The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may contain the same type of silane coupling agent. The silane coupling agent of the same type may have at least a common functional group, and other functional groups in the molecule and the amount added may be different.
The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may further contain different silane coupling agents.

Further, the silane coupling agent (D) can include a silane coupling agent having a hydrophobic group. As a result, this hydrophobic group is imparted to the surface of the silica particles (C), so that the cohesive force of the silica particles (C) is reduced in the silicone rubber-based curable composition and thus in the silicone rubber (hydrogen due to the silanol group). Aggregation due to bonding is reduced), and as a result, it is presumed that the dispersibility of the silica particles (C) in the silicone rubber-based curable composition is improved. As a result, the interface between the silica particles (C) and the rubber matrix increases, and the reinforcing effect of the silica particles (C) increases. Further, it is presumed that the slipperiness of the silica particles (C) in the matrix is improved when the rubber matrix is deformed. Then, by improving the dispersibility and slipperiness of the silica particles (C), the mechanical strength (for example, tensile strength, tear strength, etc.) of the silicone rubber due to the silica particles (C) is improved.

Further, the silane coupling agent (D) can include a silane coupling agent having a vinyl group. As a result, a vinyl group is introduced on the surface of the silica particles (C). Therefore, when the silicone rubber-based curable composition is cured, that is, the vinyl group of the vinyl group-containing organopolysiloxane (A) and the hydride group of the organohydrogenpolysiloxane (B) undergo a hydrosilylation reaction. When the network (crosslinked structure) formed by these is formed, the vinyl group of the silica particles (C) is also involved in the hydrosilylation reaction with the hydride group of the organohydrogenpolysiloxane (B). Silica particles (C) will also be incorporated into. As a result, it is possible to reduce the hardness and increase the modulus of the formed silicone rubber.

As the silane coupling agent (D), a silane coupling agent having a hydrophobic group and a silane coupling agent having a vinyl group can be used in combination.

Examples of the silane coupling agent (D) include those represented by the following formula (4).

Y _n -Si- (X) _4-n ... (4)
In the above equation (4), n represents an integer of 1 to 3. Y represents any functional group having a hydrophobic group, a hydrophilic group or a vinyl group, and when n is 1, it is a hydrophobic group, and when n is 2 or 3, at least one of them is. It is a hydrophobic group. X represents a hydrolyzable group.

The hydrophobic group is an alkyl group having 1 to 6 carbon atoms, an aryl group, or a hydrocarbon group in which these are combined, and examples thereof include a methyl group, an ethyl group, a propyl group, a phenyl group, and the like. Methyl groups are preferred.

Examples of the hydrophilic group include a hydroxyl group, a sulfonic acid group, a carboxyl group, a carbonyl group and the like, and a hydroxyl group is particularly preferable. The hydrophilic group may be contained as a functional group, but is preferably not contained from the viewpoint of imparting hydrophobicity to the silane coupling agent (D).

Further, examples of the hydrolyzable group include an alkoxy group such as a methoxy group and an ethoxy group, a chloro group or a silazane group, and among them, a silazane group is preferable because it has high reactivity with the silica particles (C). A group having a silazane group as a hydrolyzable group has two structures of ( _Yn —Si—) in the above formula (4) due to its structural characteristics.

Specific examples of the silane coupling agent (D) represented by the above formula (4) are as follows.
Examples of the functional group having a hydrophobic group include methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, and n-propyltrimethoxysilane. Ekalkylsilanes such as n-propyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, decyltrimethoxysilane; chlorosilanes such as methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, phenyltrichlorosilane; hexamethyldisilazane. Can be mentioned. Among these, a silane coupling agent having a trimethylsilyl group containing at least one selected from the group consisting of hexamethyldisilazane, trimethylchlorosilane, trimethylmethoxysilane, and trimethylethoxysilane is preferable.

As the functional group having a vinyl group, for example, methacryloxypropyltriethoxysilane, methacryloxypropyltrimethoxysilane, methacryloxypropylmethyldiethoxysilane, methacryloxypropylmethyldimethoxysilane, vinyltriethoxysilane, vinyltrimethoxy. Alkoxysilanes such as silanes, vinylmethyldimethoxysilanes; chlorosilanes such as vinyltrichlorosilanes, vinylmethyldichlorosilanes; and divinyltetramethyldisilazane. Among these, methacryloxypropyltriethoxysilane, methacryloxypropyltrimethoxysilane, methacryloxypropylmethyldiethoxysilane, methacryloxypropylmethyldimethoxysilane, divinyltetramethyldisilazane, vinyltriethoxysilane, vinyltrimethoxysilane, and vinyl. A silane coupling agent having a vinyl group-containing organosilyl group containing at least one selected from the group consisting of methyldimethoxysilane is preferable.

When the silane coupling agent (D) contains two types of a silane coupling agent having a trimethylsilyl group and a silane coupling agent having a vinyl group-containing organosilyl group, the one having a hydrophobic group is hexamethyldisilazane. Those having a vinyl group preferably contain divinyltetramethyldisilazane.

When a silane coupling agent having a trimethylsilyl group (D1) and a silane coupling agent having a vinyl group-containing organosilyl group (D2) are used in combination, the ratio of (D1) to (D2) is not particularly limited, but for example. By weight ratio, (D1): (D2) is 1: 0.001 to 1: 0.35, preferably 1: 0.01 to 1: 0.20, more preferably 1: 0.03 to 1: 0. It is .15. By setting such a numerical range, the desired physical properties of the silicone rubber can be obtained. Specifically, it is possible to balance the dispersibility of silica in the rubber and the crosslinkability of the rubber.

In the present embodiment, the lower limit of the content of the silane coupling agent (D) is preferably 1% by mass or more with respect to 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A). It is more preferably 5% by mass or more, and further preferably 5% by mass or more. The upper limit of the content of the silane coupling agent (D) is preferably 100% by mass or less, preferably 80% by mass or less, based on 100 parts by mass of the total amount of the vinyl group-containing organopolysiloxane (A). It is more preferably present, and further preferably 40% by mass or less.
By setting the content of the silane coupling agent (D) to the above lower limit value or more, the adhesion between the columnar portion containing the elastomer and the conductive resin layer can be enhanced. Further, it can contribute to the improvement of the mechanical strength of the silicone rubber. Further, by setting the content of the silane coupling agent (D) to the above upper limit value or less, the silicone rubber can have appropriate mechanical properties.

<< Platinum or platinum compound (E) >>
The silicone rubber-based curable composition according to the present embodiment may contain a catalyst. The catalyst can include platinum or platinum compound (E). Platinum or the platinum compound (E) is a catalytic component that acts as a catalyst during curing. The amount of platinum or the platinum compound (E) added is the amount of the catalyst.

The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may contain the same type of catalyst. The catalysts of the same type may have at least a common constituent material, and the catalysts may contain different compositions or may have different addition amounts.
The insulating silicone rubber-based curable composition and the conductive silicone rubber-based curable composition may further contain different catalysts from each other.

As the platinum or the platinum compound (E), known ones can be used, for example, platinum black, platinum supported on silica, carbon black or the like, platinum chloride acid or an alcohol solution of platinum chloride acid, chloride. Examples thereof include a complex salt of platinum acid and olefin, and a complex salt of platinum chloride acid and vinyl siloxane.

As the platinum or the platinum compound (E), only one type may be used alone, or two or more types may be used in combination.

In the present embodiment, the content of platinum or the platinum compound (E) in the silicone rubber-based curable composition means a catalyst amount and can be appropriately set, but specifically, a vinyl group-containing organopolysiloxane. The amount of the platinum group metal is 0.01 to 1000 ppm by weight with respect to 100 parts by weight of the total amount of (A), the silica particles (C) and the silane coupling agent (D), and is preferably 0. The amount is 1 to 500 ppm.
By setting the content of platinum or the platinum compound (E) to the above lower limit value or more, the silicone rubber-based curable composition can be cured at an appropriate rate. Further, by setting the content of platinum or the platinum compound (E) to the above upper limit value or less, it is possible to contribute to the reduction of manufacturing cost.

<< Water (F) >>
Further, the silicone rubber-based curable composition according to the present embodiment may contain water (F) in addition to the above components (A) to (E).

Water (F) functions as a dispersion medium for dispersing each component contained in the silicone rubber-based curable composition, and is a component that contributes to the reaction between the silica particles (C) and the silane coupling agent (D). .. Therefore, in the silicone rubber, the silica particles (C) and the silane coupling agent (D) can be more reliably connected to each other, and uniform characteristics can be exhibited as a whole.

(Other ingredients)
Further, the silicone rubber-based curable composition of the present embodiment may further contain other components in addition to the above components (A) to (F). Other components include silica particles (C) such as diatomaceous earth, iron oxide, zinc oxide, titanium oxide, barium oxide, magnesium oxide, cerium oxide, calcium carbonate, magnesium carbonate, zinc carbonate, glass wool, and mica. Examples thereof include additives such as inorganic fillers, reaction inhibitors, dispersants, pigments, dyes, antioxidants, antioxidants, flame retardants, and thermal conductivity improvers.

The conductive solution (conductive silicone rubber composition) according to the present embodiment contains the conductive filler and the solvent in addition to the silicone rubber-based curable composition which does not contain the conductive filler.

As the solvent, various known solvents can be used, and for example, a high boiling point solvent can be included. These may be used alone or in combination of two or more.

Examples of the above solvent include aliphatic hydrocarbons such as pentane, hexane, cyclohexane, heptane, methylcyclohexane, ethylcyclohexane, octane, decane, dodecane and tetradecane; benzene, toluene, ethylbenzene, xylene and trifluoromethylbenzene. , Benzotrifluoride and other aromatic hydrocarbons; diethyl ether, diisopropyl ether, dibutyl ether, cyclopentyl methyl ether, cyclopentyl ethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, 1,4-dioxane, 1,3 -Ethers such as dioxane and tetrahydrofuran; haloalkanes such as dichloromethane, chloroform, 1,1-dichloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2-trichloroethane; N, N-dimethyl Carboxyric acid amides such as formamide and N, N-dimethylacetamide; sulfoxides such as dimethyl sulfoxide and diethyl sulfoxide can be exemplified. These may be used alone or in combination of two or more.

By adjusting the amount of solid content in the solution, the conductive solution can have an appropriate viscosity for various coating methods such as spray coating and dip coating.

When the conductive solution contains the conductive filler and the silica particles (C), the lower limit of the content of the silica particles (C) contained in the protrusion 60 is the silica particles (C) and the conductive filler. For example, it may be 1% by mass or more, preferably 3% by mass or more, and more preferably 5% by mass or more with respect to the total amount of 100% by mass. Thereby, the mechanical strength of the protrusion 60 can be improved. On the other hand, the upper limit of the content of the silica particles (C) contained in the protrusion 60 is, for example, 20% by mass or less with respect to 100% by mass of the total amount of the silica particles (C) and the conductive filler. It is preferably 15% by mass or less, and more preferably 10% by mass or less. As a result, it is possible to balance the conductivity of the protrusion 60 with the mechanical strength and flexibility.

A conductive silicone rubber can be obtained by heating and drying the conductive solution as required.
The conductive silicone rubber may have a structure that does not contain silicone oil. As a result, it is possible to prevent the silicone oil from bleeding out to the surface of the protrusion 60, thereby suppressing the decrease in conductivity.

<Material of signal line 69>
As the signal line 69, known ones can be used, but for example, the signal line 69 may be made of a conductive fiber. As the conductive fiber, one or more selected from the group consisting of metal fiber, metal-coated fiber, carbon fiber, conductive polymer fiber, conductive polymer-coated fiber, and conductive paste-coated fiber can be used. These may be used alone or in combination of two or more.

The metal materials of the above metal fibers and metal-coated fibers are not limited as long as they have conductivity, but copper, silver, gold, nickel, tin, lead, zinc, bismuth, antimony, stainless steel, aluminum, and silver / chloride. Examples include silver and alloys thereof. These may be used alone or in combination of two or more. Among these, silver can be used from the viewpoint of conductivity. Further, it is preferable that the metal material does not contain a metal such as chromium that gives an environmental load.

The fiber material of the metal-coated fiber, the conductive polymer-coated fiber, and the conductive paste-coated fiber is not particularly limited, and may be any of synthetic fiber, semi-synthetic fiber, and natural fiber. Among these, it is preferable to use polyester, nylon, polyurethane, silk, cotton and the like. These may be used alone or in combination of two or more.

Examples of the carbon fiber include PAN-based carbon fiber and pitch-based carbon fiber.

The conductive polymer material of the conductive polymer fiber and the conductive polymer-coated fiber is, for example, a mixture of a conductive polymer and a binder resin such as polythiophene, polypyrrole, polyaniline, polyacetylene, polyphenylene vinylene, polynaphthalene, and derivatives thereof. Alternatively, an aqueous solution of a conductive polymer such as PEDOT-PSS ((3,4-ethylenedioxythiophene) -poly (styrene sulfonic acid)) is used.

The resin material contained in the conductive paste of the conductive paste-coated fiber is not particularly limited, but is preferably elastic, for example, silicone rubber, urethane rubber, fluororubber, nitrile rubber, acrylic rubber, styrene rubber, chloroprene rubber, and ethylene. It can contain one or more selected from the group consisting of propylene rubber. These may be used alone or in combination of two or more.

The conductive filler contained in the conductive paste of the conductive paste-coated fiber is not particularly limited, but a known conductive material may be used, but metal particles, metal fiber, metal-coated fiber, carbon black, acetylene black, graphite, carbon. It can include one or more selected from the group consisting of fibers, carbon nanotubes, conductive polymers, conductive polymer coated fibers and metal nanowires.

The metal constituting the conductive filler is not particularly limited, but is, for example, copper, silver, gold, nickel, tin, lead, zinc, bismuth, antimony, silver / silver chloride, or at least one of these alloys. , Or two or more of these can be included. Among these, silver or copper is preferable because of its high conductivity and high availability.

The signal line 69 may be composed of a twisted yarn obtained by twisting a plurality of linear conductive fibers. Thereby, the disconnection of the signal line 69 at the time of deformation can be suppressed.

In the present embodiment, the coating on the conductive fiber does not only cover the outer surface of the fiber material, but in the case of a twisted yarn obtained by twisting a single fiber, a metal or a conductive polymer is formed in the fiber gap in the twisted yarn. , Or, which is impregnated with a conductive paste and covers the single fibers constituting the plyed yarn one by one.

The tensile elongation at break of the signal line 69 is, for example, 1% or more and 50% or less, preferably 1.5% or more and 45%. By setting it within such a numerical range, it is possible to suppress excessive deformation of the protrusion 60 while suppressing breakage at the time of deformation.

<Material of electrode portion 80>
The conductive member of the electrode portion 80 is, for example, a paste containing a good conductive metal. Good-leading metals include one or more selected from the group consisting of copper, silver, gold, nickel, tin, lead, zinc, bismuth, antimony, or alloys thereof. In particular, silver, silver chloride, and copper are suitable from the viewpoint of availability and conductivity.

When the electrode portion 80 is formed of a paste containing a good conducting metal, the top of the protrusion 60 made of a rubber-like elastic body (here, a region including at least the electrode forming surface 62) contains the good conducting metal. Dip (immerse and apply) in a paste-like conductive solution. As a result, the electrode portion 80 is formed on the surface of the electrode forming surface 62 of the protrusion 60.

The electrode portion 80 as the conductive resin layer may be formed by applying the conductive solution containing the conductive filler and the solvent to the electrode forming surface 62 of the protrusion portion 60. At this time, by using a material (silicone rubber) of the same system as the protrusion 60 as the solvent, the adhesion of the electrode portion 80 (conductive resin layer) can be enhanced.

A conductive silicone rubber can be obtained by heating and drying the conductive solution as required.
The conductive silicone rubber may have a structure that does not contain silicone oil. It is possible to prevent the continuity from being lowered due to the silicone oil bleeding out on the surface of the electrode portion 80.

As a result, it is possible to improve the hair scraping performance when the electroencephalogram measuring device 1 is attached to the head 99. Further, it is possible to secure a sufficient contact area of the electrode forming surface 62 (that is, the electrode portion 80) when the electroencephalogram measuring device 1 is attached.

<Manufacturing method of electrode 50 for brain wave detection>
An example of the method for manufacturing the electroencephalogram detection electrode 50 of the present embodiment can include the following steps.
First, the silicone rubber-based curable composition is heat-press molded using a mold to obtain a molded product composed of a base 51 and a protrusion 60. Subsequently, a signal line 69 is passed through the inside of each protrusion 60 of the obtained molded product using a sewing needle. After that, a paste-like conductive solution is dip-applied to the electrode-forming surface 62 of the protrusion 60 of the obtained molded body, and after heating and drying, post-cure is performed. As a result, the electrode portion 80 can be formed on the electrode forming surface 62 of the protrusion 60.
From the above, the electroencephalogram detection electrode 50 can be manufactured.
At the time of the molding step, insert molding may be used in which the silicone rubber-based curable composition is introduced into the molding space in which the signal line 69 is arranged and pressure-heat molded.

<Summary of features of electrode 50 for EEG detection>
The features of the electroencephalogram detection electrode 50 of the electroencephalogram measuring device 1 of the first embodiment, particularly the structure of the protrusion 60, will be collectively described.

(1) The electroencephalogram detection electrode 50 has a columnar base 51 (support) and
A plurality of protrusions 60 extending from the circular end face of the base 51,
The electrode portion 80 provided on the protrusion 60 and the electrode portion 80
Have,
The protrusion 60 has a shape in which the tip portion of the cone is cut off at an angle.
The plurality of protrusions 60 do not interfere with each other and are arranged in an annular shape on the base 51.
(2) The diameter of the circular shape C1 formed by connecting the center points of the protrusion bottom surfaces 63 of the plurality of protrusions 60 is d1, the width direction length of the bottom surface of the cone (that is, the protrusion bottom surface 63) is d2, and the protrusions. When the number of 60 is n, the predetermined pitch p1 represented by the following equation (1) is 0.5 mm or more and 5 mm or less.
p1 = (π ・ d1-n ・ d2) / n ... Equation (1)
(3) The diameter d1 of the circular shape C1 is 8 mm or more and 12 mm or less.
(4) The length d2 in the width direction of the bottom surface of the cone (the bottom surface of the protrusion 63) is 2 mm or more and 3.5 m or less.
(5) The height h of the protrusion 60 is 2 mm or more and 10 mm or less.
(6) The outer diameter d0 of the base 51 is 13 mm or more and 16 mm or less.
(7) The base 51 and the protrusion 60 are made of silicone rubber.

<< Second Embodiment >>
The electroencephalogram detection electrode 150 of the present embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a perspective view of the electroencephalogram detection electrode 150. FIG. 11 is a view of the two protrusions 160 as viewed from the center side. The electroencephalogram detection electrode 150 of the present embodiment is different from the electroencephalogram detection electrode 50 of the first embodiment in that the lower portion (the portion on the protrusion forming surface 52 side) of the protrusion 160 overlaps. Hereinafter, the description will be focused on different parts, and the description of the same configuration and the like will be omitted as appropriate.

<Structure of electrode 150 for brain wave detection>
The electroencephalogram detection electrode 150 includes a columnar base 151, a plurality of protrusions 160 extending from a circular end surface of the base 151 (here, a protrusion forming surface 152), and an electrode portion 180 provided on the protrusion 160. And have.

The protrusion 160 has a shape in which the tip portion of a cone (here, a cone) is cut off diagonally. Further, the protrusion 160 has a region where the cones overlap each other, and is arranged in an annular shape on the protrusion forming surface 52 of the base 51. Each of the protrusions 160 has a main body interference portion 168 that overlaps with the adjacent protrusions 160, and a main body non-interference portion 169 that does not overlap. That is, the main body interference portion 168 extends from the protrusion forming surface 152, and the main body non-interference portion 169 is further provided on the tip end side thereof. The non-interference portion 169 of the main body is provided with an elliptical electrode forming surface 162, and an electrode portion 180 is further provided therein.

Here, the height h11 of the protrusion 160 (that is, the length from the interface with the protrusion forming surface 152 to the tip portion 165) is 5 mm or more and 15 mm or less.
The height h12 of the non-interfering portion 169 of the main body (the region where the cones do not overlap) is 2 mm or more and 10 mm or less. From the analysis results by simulation, it was confirmed that if the height h12 of the non-interfering portion 169 of the main body is low, when the protrusion 160 is pressed, the tip does not reach the scalp and the tendency to get on the hair increases. did it. By setting the height h12 to 2 mm or more, such a concern can be eliminated. That is, when the protrusions 160 arranged in an annular shape are pressed against each other, the distance between the protrusions 160 is widened within a certain range and the hair is accommodated. However, when the height h12 is less than 2 mm, the distance between the protrusions 160 cannot be widened to the extent that the hair can be accommodated, and the tip of the protrusions 160 may not reach the scalp.

The electroencephalogram detection electrode 150 of the present embodiment has a region where adjacent protrusions 160 overlap each other in the main body interference portion 168, but the heights h11 and 12 as described above secure a space for accommodating hair. can. Further, even if a space corresponding to the height of the main body interference portion 168 is provided on the center side of the annular shape in which the protrusion 60 is arranged, a space for storing the hair can be secured.

Although the embodiments of the present invention have been described above with reference to the drawings, these are examples of the present invention, and various configurations (modifications) other than the above can be adopted.

Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited to the description of these Examples.

<First Example>
In the following embodiment, a plurality of electrodes 50 for detecting brain waves, which correspond to the first embodiment and have different diameters d2 of the protrusion bottom surface 63 of the protrusion 60 and the number of protrusions 60, are prepared. For each of the electroencephalogram detection electrodes 50, the pitch p1 between the protrusions 60 was obtained, and the state of hair accommodation between the protrusions 60 was evaluated.
The dimensions and the like of the base 51 and the protrusion 60 are as follows.
d0: 14 mm (fixed)
d1: 10 mm (fixed)
d2: 2.3 mm, 2.7 mm, 3.2 mm
n: 6, 8, 10, 12, 14
Calculated by p1: (π ・ d1-n ・ d2) / n

When the diameter d2 of the protrusion bottom surface 63 of the protrusion 60 is 2.3 mm and the number n of the protrusions 60 is 6 to 10 (Examples 1 to 3), the pitch p1 is 0.5 mm or more and 5 mm or less. There was, and the condition of accommodating the hair between the protrusions 60 was good. Further, when the number n of the protrusions 60 was 12 (Example 4), the pitch p1 = 0.32, but when the amount of hair was small, the hair accommodation condition was good. When the number n of the protrusions 60 is 14 (Comparative Example 1), a region where the protrusions 60 overlap is generated.

When the diameter d2 of the protrusion bottom surface 63 of the protrusion 60 is 2.7 mm and the number n of the protrusions 60 is 6 to 8 (Examples 5 to 6), the pitch p1 is 0.5 mm or more and 5 mm or less. There was, and the state of accommodating the hair between the protrusions 60 was good. Further, when the number n of the protrusions 60 was 10 (Example 7), the pitch p1 = 0.44, but when the amount of hair was not large, the hair accommodation condition was good. When the number n of the protrusions 60 is 12 to 14 (Comparative Examples 2 to 3), a region where the protrusions 60 overlap is generated.

When the diameter d2 of the protrusion bottom surface 63 of the protrusion 60 is 3.2 mm and the number n of the protrusions 60 is 6 to 8 (Examples 8 to 9), the pitch p1 is 0.5 mm or more and 5 mm or less. There was, and the state of accommodating the hair between the protrusions 60 was good. When the number n of the protrusions 60 is 10 to 14 (Comparative Examples 4 to 6), a region where the protrusions 60 overlap is generated.

<Second Example>
Table 2 shows examples and comparative examples of the dimensions of the protrusion 60 (diameter D1, diameter D2, height H of the tip portion 65, angle α of the apex angle) described with reference to FIG. Here, the value of tan (α / 2) of the above-mentioned equation (2a) is shown. Table 3 shows the angle α of the apex angle corresponding to the value of the equation (2a). In the table, examples are shown as areas surrounded by bold letters and thick lines. Here, the height h of the lower end portion 66 of the elliptical electrode forming surface 62 is fixed at 2 mm. That is, the electrode is formed by cutting a cone having the following dimensions with a plane such that the straight line connecting the tip portion 65 (height H) and the lower end portion 66 (height h = 2 mm fixed) is the elliptical long axis. The surface 62.
Height H: 1 to 10 mm (10 types at 1 mm intervals)
D1: 2.3mm, 2.7mm, 3.2mm
D2: 0.3mm, 0.5mm, 1.0mm
Further, in FIG. 12, as an example of the shape of the protrusion 60, a list of side views of the protrusion 60 as viewed from the center 59 side (Examples 11-18, Comparative Example 11) for the shape when the height H = 6 mm. ) Is shown.

In Tables 2 and 3, when looking at the value of the diameter D1 of the bottom surface 63 of each protrusion, there is the following tendency.
(A) In the table, the protrusions 60 located on the right side and the upper side have a larger deformation with a lower load. That is, the higher the height H and the smaller the diameter D2 on the tip side, the easier it is to deform, and the more cases the contact between the electrode forming surface 62 and the scalp cannot be maintained.
(B) In the table, the protrusions 60 located on the left side and the lower side have lower hair sorting performance. That is, the lower the height H and the larger the diameter D2 on the tip side, the poorer the hair is separated, and the more cases the hair intervenes between the electrode forming surface 62 and the scalp.

1 EEG measuring device 10 EEG electrode unit 20 Frame 21 Electrode unit mounting part 50, 150 EEG detection electrode 51, 151 Base 52, 152 Projection forming surface 54 Side surface 60, 160 Projection 61, 161 Projection body 62, 162 Electrodes Formed surface 63 Projection bottom surface 65 Tip portion 168 Main body interference part 169 Main body non-interference part

Claims (10)

With a columnar base,
A plurality of protrusions extending from the circular end face of the base,
The electrode portion provided on the protrusion and the electrode portion
Have,
The protrusion has a shape in which the tip of the cone is cut off at an angle.
The plurality of protrusions do not interfere with each other and are arranged in an annular shape on the base.
Electrodes for EEG measurement. The diameter of the circular shape formed by connecting the center points of the bottom surfaces of the plurality of protrusions is d1.
The length of the bottom surface of the cone in the width direction is d2,
When the number of the protrusions is n,
p1 = (π ・ d1-n ・ d2) / n ... Equation (1)
The predetermined pitch p1 represented by is 0.5 mm or more and 5 mm or less.
The electrode for electroencephalogram measurement according to claim 1. The circular diameter d1 is 8 mm or more and 12 mm or less.
The electrode for electroencephalogram measurement according to claim 2. The length d2 of the bottom surface of the cone in the width direction is 2 mm or more and 3.5 m or less.
The electrode for electroencephalogram measurement according to claim 2 or 3. The height of the protrusion is 2 mm or more and 10 mm or less.
The electrode for electroencephalogram measurement according to any one of claims 1 to 3. The outer diameter of the base is 13 mm or more and 16 mm or less.
The electrode for electroencephalogram measurement according to any one of claims 1 to 5. With a columnar base,
A plurality of protrusions extending from the circular end face of the base,
The electrode portion provided on the protrusion and the electrode portion
Have,
The protrusion has a shape in which the tip of the cone is cut off at an angle.
The plurality of protrusions have a region where the cones overlap and are arranged in an annular shape at the base.
Electrodes for EEG measurement. The height of the protrusion is 5 mm or more and 15 mm or less.
The electrode for electroencephalogram measurement according to claim 7, wherein the height of the region where the cones do not overlap is 2 mm or more and 10 mm or less. The electrode for electroencephalogram measurement according to any one of claims 1 to 8, wherein the base portion and the protrusion portion are made of silicone rubber. The electroencephalogram measuring apparatus provided with the electroencephalogram measuring electrode according to any one of claims 1 to 9.

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