JP7331357B2 - Connector structure, wearable terminal, and biological information measurement system - Google Patents

Description

The present invention relates to a highly durable connector structure for detecting biological information, a wearable terminal using the same, and a biological information measurement system.

In recent years, there has been an increasing need to constantly detect biological information such as heartbeat, pulse, and electrocardiogram for early detection of diseases and maintenance of health. is not realistic, and if the device were to be used, it would impose physical and psychological burdens on the subject. In order to solve such problems, various devices (so-called wearable sensors) that can easily detect biological information by being worn on clothes have been developed. attached to clothing in a variety of ways.

Wearable sensors are electrically and mechanically connected to wiring formed on clothes, but since the clothes need to be washed, wearable sensors are usually connected so that they can be removed from the clothes. There is. Hook-and-loop fasteners, snap buttons (also called snap hooks or snap fasteners), or specially developed connectors are used to detachably attach wearable sensors and clothing wiring. Of these, snap buttons are commonly used in the apparel industry, so they are easy to apply to clothes, and they are used in a relatively large number of cases because they can be used for both electrical and mechanical connections at the same time. It is
The snap button is made of a highly rigid material such as metal, while the wiring on the clothing side is made of a relatively flexible material such as a conductive fiber or stretchable conductor composition. Therefore, when the wearable sensor is attached and detached, excessive expansion and contraction and bending are applied to the joint between the snap button and the wiring member (conductive layer) on the clothing side. There is a risk that the conductive layer that is the wiring of the

Patent Document 3 proposes to solve this problem by sandwiching a conductive member having an opening between headed shaft members. The electrical resistance between the headed shaft members increases, which may cause a problem that hinders biosignal extraction. In addition, since the conductive member used as the opening member is inferior in compressive rigidity, when a load such as repeated expansion and contraction or bending is applied, buckling failure progresses especially in the overlapping portion of the conductive member, and electrical connection is lost at the joint. It is likely to become stable.

JP 2014-226367 A JP 2011-98214 A JP 2017-46913 A

In the present invention, in the connector portion used for mechanical and electrical connection between the clothing in which the wiring is formed and the wearable sensor that is detachably attached, vibrations when the wearable sensor is attached and detached, or when the wearable sensor is worn, and even when washed. An object of the present invention is to provide a connector structure that eliminates connection problems due to stress caused by expansion, contraction and bending of a base material, a wearable terminal using the connector structure, and a biological information measurement system using the wearable terminal.

That is, the present invention has the following configurations.
[1] A flexible insulating base material;
a layered structure having at least a conductive layer in contact with the first surface of the insulating base;
a rivet-like member made of a conductive material and having a shaft penetrating the layered structure and a head in contact with the conductive layer;
In a connector structure having a cover member made of a conductive material covering the shaft of the tack-like member from the second surface side of the insulating base material,
A connector structure comprising a cover member that covers the head of the rivet-like member and is in contact with the conductive layer.
[2] The connector structure according to [1] above, which has an opening member between the second surface of the insulating base material and the cover member.
[3] The connector structure according to [1] or [2], wherein the outer diameter of the opening member is larger than the outer diameter of the lid member.
[4] The connector structure according to any one of [1] to [3], wherein the outer diameter of the opening member is 1 mm or more larger than the outer diameter of the lid member.
[5] The connector structure according to any one of [2] to [4], wherein the outer diameter of the cover member is 1 mm or more larger than the outer diameter of the head of the rivet member.
[6] (Elongation modulus of conductive layer) (MPa) × (thickness of conductive layer) (mm) is A,
When (extension elastic modulus of cover member) (MPa) x (thickness of cover member) (mm) is C,
(A+C)>A×1.5
The connector structure according to any one of [1] to [5], which satisfies the relationship of
[7] (Elongation modulus of conductive layer) (MPa) × (thickness of conductive layer) (mm) is A,
When (extension elastic modulus of opening member) (Mpa) x (thickness of opening member) (mm) is B,
(A+B)>A×1.5
The connector structure according to any one of [2] to [6], which satisfies the relationship of
[8] The connector structure according to any one of [2] to [7], wherein the opening member is adhered to the insulating base material.
[9] The opening member according to any one of [1] to [8], wherein the opening member is a thermoplastic resin sheet, and the softening temperature of the thermoplastic resin sheet<the softening temperature of the insulating base material. Connector structure.
[10] The opening member is a resin sheet having at least two layers with different softening temperatures, and the softening temperature of the layer with the lower softening temperature of the resin sheet<the softening temperature of the insulating base [1] ] The connector structure according to any one of [8].
[11] A wearable terminal comprising the electrode structure according to any one of [1] to [10].
[12] A biological information measurement system using the wearable terminal according to [11].

The present invention further preferably has the following configurations.
[13] The above-mentioned [1]-, wherein the conductive layer is deformed when the head of the rivet-shaped member is embedded in the conductive layer, and the side surface of the head of the rivet-shaped member is in contact with the conductive layer. The connector structure according to [10], the wearable terminal according to [11], and the biological information measuring system according to [12].
[14] The connector structure according to [1] to [10], wherein the portion of the conductive layer that contacts the head of the rivet-shaped member is thicker than the other regions; The wearable terminal described above and the biological information measurement system described in [12] above.
[15] The connector structure according to [2] to [10], the wearable terminal according to [11], and the wearable terminal according to [12], wherein the material of the cover member is a conductive material. biological information measurement system.
.
[16] The wearable terminal according to [11] and the biological information measurement system according to [12], which are of a patch type.
[17] The wearable terminal according to [11] and the biological information measurement system according to [12], which are of a clothing type.
[18] A health condition monitoring system using the biological information measuring system according to any one of [12], [16], and 17].
[19] An exercise support system using the biological information measuring system according to any one of [12], [16], and 17].

In the present invention, a tack-like member is joined through the conductive layer and the base material for signal extraction. Since the expansion/contraction deformation and bending deformation of the region corresponding to the head portion of the tack-shaped member in the electrode member are reduced and stress concentration is avoided, local deformation of the conductive layer is suppressed. As a result, when this connector structure is used for biosignal measurement, the possibility of damage due to elongation or bending deformation applied to the connector structure during measurement or when attaching and detaching is reduced, and more accurate measurement can be performed over a long period of time. becomes possible. In the present invention, when the opening member and the flexible base material are adhered to each other, a more remarkable effect is exhibited.

In addition, a tack-like member is joined by piercing the conductive layer and the material for signal extraction. Bonding the cover member also reduces the expansion/contraction deformation and bending deformation of the region near the contour of the tack-like member, avoiding stress concentration, thereby suppressing local deformation of the conductive layer. As a result, when this connector structure is used for biosignal measurement, the possibility of damage due to elongation and bending deformation applied to the connector structure during measurement, attachment and detachment, and washing is reduced, and more accurate Measurement can be performed over a long period of time.

An opening member is inserted between the cover member covering the shaft portion of the tack-like member and the base material, and a cover member having a size that completely covers the head of the tack-like member of the tack-like member and reaches the peripheral electrode portion is provided. The bonding effectively reduces the expansion/contraction deformation and bending deformation of the region near the contour of the tack-like member, and avoids stress concentration, thereby further suppressing local deformation of the conductive layer. As a result, when this connector structure is used for biosignal measurement, the possibility of damage due to elongation or bending deformation applied to the connector structure during measurement or when attaching and detaching is reduced, and more accurate measurement can be performed over a long period of time. becomes possible.

According to the present invention, as a further unexpected effect, the wearable sensor connected to the lid member can be easily attached and detached because the tack-shaped member and the periphery of the lid member are less likely to deform.

FIG. 1 is a schematic cross-sectional view of an example of a connector structure according to the present invention. FIG. 2 is a schematic cross-sectional view of another example of the connector structure in the present invention. FIG. 3 is a schematic cross-sectional view of an example of a conventional connector structure. FIG. 4 is a schematic cross-sectional view of another example of a conventional connector structure.

The present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram showing a cross section of a connector structure in one example of an embodiment of the present invention.
The insulating base material (1) having flexibility in the present invention is a planar member, and polymer films, nonwoven fabrics, woven fabrics, knitwear, paper, foams, and the like can be used. Various organic polymers can be used as these materials, specifically polyethylene terephthalate, polytrimethylene terephthalate, nylon 6, nylon 66, polyurethane, synthetic rubber, aramid, acrylic, acrylate, polyethylene, and polypropylene. Typical examples include synthetic polymers, semi-synthetic polymers such as rayon and acetate, and natural polymers such as cotton, wool, silk, and natural rubber. Of course, it is possible to appropriately use materials other than those mentioned here, as long as they are planar materials having flexibility, even if they are not structural bodies.

The flexible conductive layer (2) in the present invention can be formed from, for example, a conductive fabric or a stretchable conductive composition containing a conductive filler and a flexible resin.
The conductive layer made of the conductive fabric includes, for example, a conductive fiber or conductive yarn obtained by coating a conductive polymer on a base fiber, or a conductive metal such as silver, gold, copper, or nickel. Fabrics, knitted fabrics, non-woven fabrics, or non-conductive yarns made of coated fibers, conductive yarns made of conductive metal fine wires, conductive yarns made by blending conductive metal fine wires and non-conductive fibers, etc. A conductive fabric embroidered may be used as the conductive layer.

The tack-like member (3) in the present invention has a head (3a) and a shaft (3b) and serves to electrically connect the conductive layer (2) and the lid member (4). At this time, the direct surface contact between the conductive layer (2) and the head of the rivet-like member makes it possible to minimize the attenuation of the electrical signal to be detected.
The rivet member (3) must be conductive in order to transmit electrical signals, and conductive metals such as silver, gold, copper, iron and nickel or their alloys are used. In addition to the above-described conductive metals, conductive composite materials in which conductive particles such as CNT, graphene, and carbon black are mixed with an organic material may also be used. Furthermore, a member in which a layer of a conductive metal, a conductive composite material, or the like is formed on the surface of an insulator can be used without any problem.

The lid member (4) is in electrical contact with the shaft portion of the rivet member (3), and directly or indirectly transmits the electrical signal transmitted from the rivet member (3) to various measuring devices. have a role
The lid member (4) must be conductive in order to transmit electric signals, and conductive metals such as silver, gold, copper, iron and nickel or alloys thereof are used. In addition to the above-described conductive metals, conductive composite materials in which conductive particles such as CNT, graphene, and carbon black are mixed with an organic material may also be used. Furthermore, a member in which a layer of a conductive metal, a conductive composite material, or the like is formed on the surface of an insulator can be used without any problem.
The lid member (4) and the rivet member (3) can be fixed in various ways as long as they are electrically connected. For example, it can be clamped and fixed by elastic deformation or plastic deformation of metal, or it can be fixed by caulking, screws, or an adhesive.
Further, the tip of the shaft portion of the rivet member (3) may be covered with the lid member (4), or may protrude from the lid member (4).

A cover member (6) covers the head (3a) of the rivet-like member (3) on the first surface of the insulating base (1) and is placed in contact with the conductive layer (2). The cover member is a flexible planar member, and may be made of polymer film, nonwoven fabric, woven fabric, knit, paper, foam, or the like. Various organic polymers can be used as these materials, specifically polyethylene terephthalate, polytrimethylene terephthalate, nylon 6, nylon 66, polyurethane, synthetic rubber, aramid, acrylic, acrylate, polyethylene, and polypropylene. Typical examples include synthetic polymers, semi-synthetic polymers such as rayon and acetate, and natural polymers such as cotton, wool, silk, and natural rubber. These materials may be used singly or in combination. Of course, it is possible to appropriately use materials other than those mentioned here, as long as they are planar materials having flexibility, even if they are not structural bodies. Also, the cover member preferably has easy moldability. For example, Soft Shine manufactured by Toyobo Co., Ltd., Lumirror F99 manufactured by Toray Industries, Inc., and the like are preferable. Further, the cover member is preferably made by laminating a hot-melt material on these easily moldable films or sheets.
Also, the cover member may be conductive, and can be formed from a conductive fabric or a conductive composition containing a conductive filler and a stretchable resin.

As shown in FIG. 2, the opening member (5) is inserted between the surface of the insulating substrate (1) opposite to the surface having the conductive layer and the cover member (4). The opening member is fixed by being sandwiched between the insulating base material (1) and the lid member (4), and is preferably further adhered to the insulating base material. For adhesion, an adhesive material, or preferably a stretchable adhesive sheet that can be softened and adhered by heat, is used for fixation. Further, when the opening member itself is a thermoplastic resin sheet, it can be bonded to the insulating substrate by thermocompression. In this case, it is preferable that the softening temperature of the thermoplastic resin sheet serving as the opening member<the softening temperature of the insulating base material. By using an opening member that satisfies this condition, the opening member can be adhered to the insulating base material without causing deterioration of the insulating base material.

Furthermore, in the present invention, the opening member is preferably a resin sheet having at least two layers with different softening temperatures. In this case, it is preferable that the softening temperature of the layer having the lower softening temperature of the resin sheet<the softening temperature of the insulating base material. If the thermoplastic resin softens at a temperature lower than the softening temperature of the insulating base material, when a textile product is used as the insulating base material, the thermoplastic resin impregnates the textile product by thermocompression, and partially Since a fiber-reinforced composite structure is formed, the rigidity of the portion where the opening member is arranged increases, and a remarkable effect of improving durability can be obtained.

As the cover member made of the conductive fabric, for example, conductive fibers or conductive yarns obtained by coating conductive polymer on base fibers, or conductive metals such as silver, gold, copper, nickel, etc. Fabrics, knitted fabrics, non-woven fabrics, or non-conductive yarns made of coated fibers, conductive yarns made of conductive metal fine wires, conductive yarns made by blending conductive metal fine wires and non-conductive fibers, etc. A conductive fabric embroidered can be used as a cover member made of a conductive fabric.

In the present invention, it is preferable that the outer diameter of the opening member is larger than the outer diameter of the lid member by 1 mm or more, preferably 2 mm or more. Further, in the present invention, the outer diameter of the cover member is preferably larger than the outer diameter of the head of the rivet member by 1 mm or more, more preferably by 2.5 mm or more, further preferably by 5 mm or more. The outer diameter can be interpreted in the same manner as in the previous section. Here, the outer diameter is expressed as a typical case where the shape of the opening member and the cover member is circular when projected on a plane. If the projected shape is not circular, the diameter of the circumscribed circle is regarded as the outer diameter.
By making the outer diameter of the opening member and/or the cover member larger than the outer diameter of the head of the rivet-shaped member and/or the lid member, the head of the rivet-shaped member is prevented from bending when a bending load is applied to the connector structure. or the edge of the lid member can be relieved, and the effect of increasing the radius of curvature is obtained, thereby suppressing excessive deformation of the conductive layer and improving the durability of the electrical connection.

In the present invention,
(Elongation elastic modulus of conductive layer) (MPa) × (thickness of conductive layer) (mm) is A,
When (extension elastic modulus of opening member) (Mpa) x (thickness of opening member) (mm) is B,
It is preferable to satisfy the relationship (A+B)>A×1.5.
Furthermore, in the present invention, (elongation modulus of conductive layer) (MPa) x (thickness of conductive layer) (mm) is defined as A,
When (extension elastic modulus of cover member) (MPa) x (thickness of cover member) (mm) is C,
It is preferable to satisfy the relationship (A+C)>A×1.5.
The product of the elastic modulus and the thickness of a member is an index of stiffness. That is, in the present invention, durability can be improved by increasing the stiffness when the opening member and/or the cover member are added to the conductive layer to be greater than 1.5 times the stiffness of the conductive layer alone. The stiffness of the opening member and/or the cover member is preferably at least 0.5 times the stiffness of the conductive layer, more preferably at least 2.5 times, and most preferably at least 5 times.
However, if the stiffness of the opening member and/or the cover member exceeds 300 times the stiffness of the conductive layer, the edge of the outer diameter of the opening member or the cover member tends to bend, which may impair the durability of the conductive layer. be.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited by the following examples, and can be carried out with appropriate modifications within the scope of the gist of the present invention. Of course, it is also possible to do so, and all of them are included in the technical scope of the present invention.
Insulating layer-forming resins and conductive pastes used in the following examples and comparative examples were prepared as follows.

(Conductive paste)
Resin (Nitrile group-containing rubber "Nipol (registered trademark) 1042" acrylonitrile content 33.3 mass% manufactured by Nippon Zeon Co., Ltd.) is dissolved in diethylene glycol monomethyl ether acetate, and silver particles ("aggregated silver powder G -35", average particle diameter 5.9 μm) was dispersed (resin 70% by volume, silver particles 30% by volume), and kneaded in a three-roll mill to obtain a conductive paste.

(polyurethane sheet)
The following polyurethane sheets were used.
・ Polyurethane sheet with hot melt: Nisshinbo "Mobilon (registered trademark) MF-103F"
・Polyurethane hot melt sheet: Nisshinbo Co., Ltd. “Mobilon (registered trademark) MOB100”

(Preparation of conductive layer)
The above conductive paste was applied onto a release sheet and dried in a hot air drying oven at 120° C. for 30 minutes or more to prepare a sheet-like conductive layer with a release sheet.

(Laminate of T-shirt and conductive layer)
Next, on the conductive layer with the release sheet, a polyurethane hot melt sheet (Mobilon MOB100) is laminated using a hot press under the conditions of a pressure of 0.5 kgf/cm2, a temperature of 130°C, and a pressing time of 20 seconds. (pasted together). After laminating a polyurethane hot-melt sheet (Mobilon MOB100), the release film was peeled off to obtain a conductive sheet with polyurethane hot-melt. After that, on the area of the polyurethane sheet with hot melt (Mobilon MF-103F), a conductive sheet with polyurethane hot melt cut to the size of an electrode with a diameter of 30 mm was laminated under the above lamination conditions of the hot press machine to form the first insulating layer. and a conductive layer (electrode). Next, a first insulating layer and a conductive The parts with layers were laminated.

(Example 1)
The T-shirt is a laminate of a flexible insulating base material (1) and a conductive layer (2), a set of snap hooks is used as a tack-like member (3) and a lid member, and a hot plate is used as a cover member (6). Using a polyurethane sheet with melt (Mobilon MF-103F), a T-shirt type wearable terminal having the connector structure of the first embodiment of the present invention shown in FIG. 1 was produced.

Here,
Lid member outer diameter 10 mm
Rivet-shaped member head outer diameter 10 mm
Outer diameter of cover member 12mm
Cover member thickness 0.1mm
Elongation modulus of cover member 16 MPa
Conductive layer thickness 0.1 mm
Elongation modulus of conductive layer 20 MPa
and
A = (extension modulus of conductive layer) (MPa) x (thickness of conductive layer) (mm) = 2.0
C=(extension elastic modulus of cover member) (Mpa)×(thickness of cover member) (mm)=1.6
and satisfies the relationship (A+C)>A×1.5.

(Example 2)
The above T-shirt is a laminate of a flexible insulating base material (1) and a conductive layer (2), a set of snap hooks is used as a tack-like member (3) and a lid member, an opening member (5) and a cover A T-shirt type wearable terminal having a connector structure according to the second embodiment of the present invention shown in FIG.
Here,
Lid member outer diameter 10mm
Rivet-shaped member head outer diameter 10 mm
Opening member outer diameter 12mm
Thickness of opening member 0.1 mm
Extension elastic modulus of opening member 16 MPa
Outer diameter of cover member 14mm
Cover member thickness 0.1mm
Elongation modulus of cover member 16 MPa
Conductive layer thickness 0.1 mm
Elastic modulus of conductive layer 20 MPa
and
A = (extension modulus of conductive layer) (MPa) x (thickness of conductive layer) (mm) = 2.0
B = (extension modulus of opening member) (Mpa) x (thickness of opening member) (mm) = 1.6
and satisfies the relationship (A+B)>A×1.5.
Furthermore, C = (extension elastic modulus of cover member) (MPa) x (thickness of cover member) (mm) = 1.6
and satisfies the relationship (A+C)>A×1.5.

(Example 3)
The T-shirt is a laminate of a flexible insulating base material (1) and a conductive layer (2), a set of snap hooks is used as a tack-like member (3) and a lid member (4), and a cover member (5) ), a circularly cut 50 μm thick easily moldable PET film (Soft Shine manufactured by Toyobo Co., Ltd.) was used to adhere a polyurethane hot melt sheet (Mobilon MOB100), and the first embodiment of the present invention shown in FIG. A T-shirt type wearable terminal having a connector structure was produced.
Here,
Lid member outer diameter 10mm
Rivet-shaped member head outer diameter 10mm
Opening member outer diameter 12mm
Thickness of opening member 0.05 mm
Extension elastic modulus of opening member 4000 MPa
Conductive layer thickness 0.1 mm
Elongation modulus of conductive layer 20 MPa
and
A = (extension modulus of conductive layer) (MPa) x (thickness of conductive layer) (mm) = 2.0
B = (extension modulus of opening member) (Mpa) x (thickness of opening member) (mm) = 200
and satisfies the relationship (A+B)>A×1.5.

(Comparative example 1)
The above T-shirt is a laminate of a flexible insulating base material (1) and a conductive layer (2), and a set of snap hooks is used as a tack-like member (3) and a lid material, and the conventional form shown in FIG. A T-shirt type wearable terminal having a connector structure was produced.

(Comparative example 2)
The T-shirt is a laminate of a flexible insulating base material (1) and a conductive layer (2), a set of snap hooks is used as a tack-like member (3) and a lid member, and a conductive opening member (7). A T-shirt type wearable terminal having a conventional connector structure shown in FIG. 4 was manufactured using a copper plate having a thickness of 1 mm.

<Evaluation>
A heart rate sensor WHS-2 manufactured by Union Tool Co., Ltd. is connected to the T-shirt type wearable terminal obtained in the examples and comparative examples, and an application "myBeat" dedicated to the same heart rate sensor WHS-2 is installed. I set it so that it could receive heartbeat data on the phone, display it on the screen, and check whether heartbeats could be detected normally.
After wearing the T-shirt type wearable terminal having each connector structure obtained in Examples and Comparative Examples for about 8 hours, it was repeatedly washed in a home-use fully automatic washing machine to confirm whether biosignals could be detected. By the way, the clothes on which the electrodes of Comparative Example 1 were installed became undetectable after about 30 times, and the clothes on which the electrodes of Comparative Example 2 were installed became undetectable after about 60 times. On the other hand, the clothes on which the electrodes of Examples 1, 2 and 3 were installed were able to detect biological signals without any problem even after 100 repetitions.

As described above, the connector structure of the present invention has practically sufficient durability, and the wearable terminal having the connector structure of the present invention exhibits high durability. Therefore, by using the wearable terminal of the present invention, it is possible to realize a highly reliable biological information measuring system, and such a biological information measuring system can be applied to a health condition monitoring system and an exercise support system. Extremely useful.

1: flexible insulating base material 2: conductive layer 3: tack-like member 3a: tack-like member head 3b: tack-like member shaft portion 4: cover member 5: opening member 6: cover member 7: conductive opening Member a: Lid member outer diameter b: Rivet member head outer diameter c: Opening member outer diameter d: Cover member outer diameter

Claims (12)

a layered structure having at least a flexible insulating substrate and a conductive layer in contact with a first surface of the insulating substrate;
a rivet-like member made of a conductive material and having a shaft penetrating the layered structure and a head in contact with the conductive layer;
a lid member made of a conductive material covering the shaft of the tack-shaped member from the second surface side of the insulating base material ;
A connector structure having
A connector structure, comprising: a conductive circular cover member that covers the head of the rivet-like member and is in contact with the conductive layer. 2. The connector structure according to claim 1, further comprising an opening member between the second surface of said insulating base material and said cover member. 3. The connector structure according to claim 2, wherein the outer diameter of said opening member is larger than the outer diameter of said cover member. 4. The connector structure according to claim 3, wherein the outer diameter of said opening member is 1 mm or more larger than the outer diameter of said cover member. The connector structure according to any one of claims 2 to 4, wherein the outer diameter of the cover member is 1 mm or more larger than the outer diameter of the head portion of the rivet member. (Elongation elastic modulus of the conductive layer) (MPa) × (thickness of the conductive layer) (mm) is A,
When (extension elastic modulus of the cover member) (MPa) x (thickness of the cover member) (mm) is C,
(A+C)>A×1.5
The connector structure according to any one of claims 1 to 5, characterized in that it satisfies the relationship of (Elongation elastic modulus of the conductive layer) (MPa) × (thickness of the conductive layer) (mm) is A,
When (extension elastic modulus of the opening member) (Mpa) x (thickness of the opening member) (mm) is B,
(A+B)>A×1.5
6. The connector structure according to any one of claims 2 to 5, characterized in that it satisfies the relationship of A connector structure according to any one of claims 2 to 5 and 7, wherein said opening member is adhered to said insulating base material. 9. The opening member according to any one of claims 2 to 5, 7, and 8, wherein the opening member is a thermoplastic resin sheet, and the softening temperature of the thermoplastic resin sheet<the softening temperature of the insulating base material. The described connector structure. The opening member is a resin sheet having at least two layers with different softening temperatures, and the softening temperature of the layer with the lower softening temperature of the resin sheet<the softening temperature of the insulating base material. 5, and the connector structure according to any one of 7-9. A wearable terminal comprising the connector structure according to any one of claims 1 to 10. A biological information measurement system using the wearable terminal according to claim 11 .