DE112015006994T5 - Pressure sensitive sensor - Google Patents

Abstract

[Problem] Creating a pressure-sensitive sensor with suppressed surface adhesion behavior and excellent processability of the tail. [Solution] This pressure-sensitive sensor is provided with: a cylindrical elastic insulator 2 having a hollow portion 2a in the longitudinal direction; and a plurality of electrode leads 3 arranged along the inner peripheral surface of the hollow portion 2a of the elastic insulator 2 such that the electrode leads are not in contact with each other. The elastic insulator 2 is provided with at least an outer layer 5 formed of a thermoplastic urethane, and the arithmetical average surface roughness Ra of the surface of the outer layer 5 is greater than or equal to 3 μm.

Description

Technical area

This invention relates to a pressure sensitive sensor.

State of the art

A pressure-sensitive sensor is known which is provided with a tubular elastic insulator having a hollow portion along a longitudinal direction and a plurality of electrode wires disposed along an inner circumferential surface of the hollow portion of an elastic insulator so as not to contact each other.

The pressure-sensitive sensor performs a switching function by contacting the inner electrode wires with each other when the pressure-sensitive sensor receives an external pressure. For example, the pressure-sensitive sensor is used to detect a squeeze through a sliding door for a vehicle.

A pressure-sensitive sensor using a thermoplastic urethane for an outer layer of the elastic insulator is disclosed in U.S.P. JP 2011-052433 A disclosed. The use of the thermoplastic urethane for the outer layer of the elastic insulator can increase the heat resistance, oil resistance, cold resistance and abrasion resistance at a low cost.

Summary of the invention

Technical problem

A detector detecting a conductive state of the electrode wire is attached to an end portion of the pressure-sensitive sensor. The detector is used as a sensor unit. In this case, tail processing is performed in many processes such as removing the elastic insulator of the pressure sensitive sensor (peeling off the sheath), soldering a conductor of the electrode wire, and resin molding the tail. In tail processing, multiple (eg, 100 to 200) pressure sensitive sensors are normally processed simultaneously through a post-processing process until a next process.

However, in the pressure-sensitive sensors using the thermoplastic urethane for the outer layer of the elastic insulator, joining of the thermoplastic urethanes of the outer layers easily occurs with each other. For example, when a pressure-sensitive sensor is released from a bundle of 100 to 200 pressure-sensitive sensors, there is a problem that a plurality of pressure-sensitive sensors are connected and involved. Therefore, the processability drops considerably.

Also, in view of expanding mass production, it is desirable to use an automatic process machine in the jacket peeling process. However, in the pressure-sensitive sensor using the thermoplastic urethane for the outer layer of the elastic insulator, there is a problem that the automatic processing machine is difficult to handle, because the removed elastic insulator due to a compound of the outer layer thermoplastic urethane with the automatic Process machine at the automatic process machine sticks.

It is an object to provide a pressure sensitive sensor with high end processing capability which prevents surface adhesion.

the solution of the problem

• einen schlauchförmigen elastischen Isolator, umfassend einen Hohlbereich entlang einer Längsrichtung; und
• eine Mehrzahl von Elektrodendrähten, die entlang einer Innenumfangsoberfläche des Hohlbereichs des elastischen Isolators derart angeordnet sind, dass sie einander nicht kontaktieren,
• wobei der elastische Isolator wenigstens eine äußere Schicht umfasst, die ein thermoplastisches Urethan umfasst, und
• wobei eine arithmetische mittlere Oberflächenrauigkeit Ra einer Oberfläche der äußeren Schicht nicht weniger als 3 µm ist.

To achieve the above object, the invention proposes a pressure-sensitive sensor comprising:

• a tubular elastic insulator comprising a hollow portion along a longitudinal direction; and
• a plurality of electrode wires arranged along an inner peripheral surface of the hollow portion of the elastic insulator so as not to contact each other,
• wherein the elastic insulator comprises at least one outer layer comprising a thermoplastic urethane, and
• wherein an arithmetic average surface roughness Ra of a surface of the outer layer is not less than 3 μm.

Advantageous Effects of the Invention

According to the present invention, there can be provided a pressure-sensitive sensor having a high processability of the tail which prevents surface adhesion.

list of figures

• 1 FIG. 10 is a cross-sectional view showing a pressure-sensitive sensor according to the embodiment of the invention. FIG.
• 2 (a) and (b) are a photograph showing a surface of an outer layer of a pressure-sensitive sensor in Example 1 and a graph, respectively, showing a measurement result of a surface roughness of the pressure-sensitive sensor in Example 1.
• 3 (a) and (b) are a photograph showing a surface of an outer layer of a pressure-sensitive sensor in Example 3 and a graph, respectively, showing a measurement result of a surface roughness of the pressure-sensitive sensor in Example 3.
• 4 (a) and (b) are a photograph showing a surface of an outer layer of a pressure-sensitive sensor in Comparative Example 1 and a graph, respectively, showing a measurement result of a surface roughness of the pressure-sensitive sensor in Comparative Example 1.
• 5 (a) and (b) are an illustration showing an explanation of an end machining of the pressure-sensitive sensor by an automatic processing machine, and a diagram showing an explanation of the end machining of the pressure-sensitive sensor by the automatic processing machine.
• 6 Fig. 10 is a cross-sectional view showing a pressure-sensitive sensor according to the other embodiment of the invention.
• 7 Fig. 10 is a cross-sectional view showing a pressure-sensitive sensor according to the other embodiment of the invention.

Description of embodiments

(Embodiments)

The embodiment of the invention will be described below in conjunction with the accompanying drawings.

1 FIG. 10 is a cross-sectional view showing a pressure-sensitive sensor according to the embodiment of the invention. FIG.

As in 1 shown is a pressure sensitive sensor 1 with a tubular elastic insulator 2 with a hollow area 2a along a longitudinal direction, and with a plurality of electrode wires 3 along an inner peripheral surface of the hollow portion 2a of the elastic insulator 2 are arranged so that they do not contact each other.

(Description of the electrode wire 3 )

The electrode wire 3 is by covering a perimeter of a conductor 6 with an electrical conductor 7 educated. In the embodiment, the case will be explained in which two electrode wires 3 be used. However, a number of electrode wires 3 also be three or more. The two electrode wires 3 are spirally along the inner peripheral surface of the hollow portion 2a arranged. The two electrode wires 3 are arranged so that they are in the cross-sectional view over the hollow area 2a across (over a center of the pressure sensitive sensor 1 away in the cross-sectional view).

Metal strands with multiple twisted metal wires should act as conductors 6 used to provide high flexibility. For example, as a leader 6 Strands comprising silver coated annealed copper wires with 26 to 30 American Wire Gauge (AWG).

A rubber material or a plastic elastic material combining a conductive filler such as carbon may be used as the conductive resin composition with which the electrical conductor 7 is formed. Likewise, as an electrical conductor 7 a conductive resin composition containing a thermoplastic styrene elastomer and carbon can be used. Since the thermoplastic styrene elastomer does not have to cross-link during formation, the thermoplastic styrene elastomer can provide a manufacturing process for the electrical conductor 7 simplify and reduce manufacturing costs better than if a material is used that has to be cross-linked during formation.

The thermoplastic styrene elastomer refers to a thermoplastic elastomer having styrene blocks at both ends of the molecule. For example, the thermoplastic styrene elastomer comprises a styrene-ethylene-butylene-styrene (SEBS) having styrene blocks at both ends of ethylene-butylene (EB), a styrene-ethylene-propylene-styrene (SEPS) having styrene blocks at both ends of ethylene-styrene. Propylene (EP), or a styrene-ethylene-ethylene-propylene-styrene (SEEPS) with styrene blocks at both ends of ethylene-ethylene-propylene.

Combined carbon in the electrical conductor 7 is the electrical conductor 7 added to give conductivity. Carbon is desirably particulate carbon such as carbon black. When using carbon other than the particulate carbon such as linear carbon or layered carbon, the electrical resistance of the electrical conductor changes 7 depending on the directions. Thus, an unfavorable effect on the behavior of the pressure-sensitive sensor 1 occur. In such a configuration, carbon black refers to carbon particles having a diameter of about 3 to 500 nm, which are produced by incomplete combustion of oil or gas, etc. Specifically, conductive carbon black having a developed configuration connecting carbon primary particles called "structure" is desirable.

The percentage by mass of carbon in the conductive resin composition with which the electrical conductor 7 is desirably not less than 18 mass%. As a consequence, the volume resistance of the electrical conductor 7 sufficiently small. The mass percentage of the carbon is calculated by dividing the mass of carbon by the mass of the entire conductive resin composition (the mass of the electrical conductor 7 ) and multiplied by 100.

(Description of the elastic insulator 2 )

The elastic insulator 2 is with at least one outer layer 5 provided with the thermoplastic urethane (the thermoplastic urethane elastomer). That is, at least one outer surface of the elastic insulator 2 contains the thermoplastic urethane.

In the embodiment, the elastic insulator 2 with a tubular element 4 whose outer peripheral surface is formed in a cross section orthogonal to the longitudinal direction in a circular shape, and with the outer layer 5, which around the tubular member 4 formed around, which contains the thermoplastic urethane.

The tubular element 4 has such elasticity (recoverability) that the tubular member 4 is deformed by exerting an external force and restored immediately after removal of the external force. The two electrode wires 3 are separated from each other only by the elastomeric force, which is the tubular element 4 own, and maintain a non-contact state when no external force is applied.

As an insulating resin composition used in the tubular member 4 For example, a rubber material such as ethylene-propylene-diene monomer (EPDM) rubber, silicone rubber, ethylene-propylene rubber, styrene-butadiene rubber, or chloroprene rubber or elastic plastic may be used.

The tubular element 4 is made by injection molding using an extruder. In the production of the tubular element 4 become the two electrode wires 3 and a plurality of (for example, five) spacers (dummy wires) twisted, and the tubular member 4 cover the two electrode wires 3 and the multiple spacers around by injection molding. Then (after forming the outer layer 5 ) becomes the hollow area 2a by removing the spacer (the dummy wire) defined.

The outer layer 5 protects the tubular element 4 and increases the damage resistance, durability and weather resistance. In the embodiment, the outer layer provides 5 an outer layer containing the thermoplastic urethane having high heat resistance, high oil resistance, high cold resistance and high abrasion resistance.

In the pressure-sensitive sensor 1 According to the embodiment, an arithmetical average surface roughness Ra of the surface of the outer layer 5 not less than 3μm. The formation of the surface of the outer layer 5 as a rough surface whose arithmetical average surface roughness Ra is not less than 3 μm prevents surface adhesion and connection and entanglement of multiple pressure-sensitive sensors 1 with each other in the tail machining. On the other hand, when the arithmetical average surface roughness Ra of the surface of the outer layer 5 is less than 3μm, is the surface of the outer layer 5 in a smooth state and the surface adhesion occurs.

With a view to further avoiding surface adhesion, the arithmetical average surface roughness Ra is the outer layer 5 preferably not less than 4 μm. On the other hand, when the arithmetic average surface roughness Ra of the outer layer 5 too large, the mechanical strength of the outer layer can be 5 lose weight, and the appearance obviously gets worse. Therefore, the arithmetic average surface roughness Ra is the outer layer 5 more preferably not more than 7 μm. That is, the arithmetic average surface roughness Ra of the outer layer 5 is more preferably not less than 4 μm and not more than 7 μm.

In this case, the arithmetical average surface roughness Ra is determined by a parameter calculation formula related to JIS B0601 (FIG. 2013 ). Although, first, a contour curve needs to be measured to calculate the arithmetical average surface roughness Ra, in the embodiment, the contour curve is measured by a non-contact contour curve measurement using a confocal microscope, etc.

• (Liniendickenmessfunktion): X-Achsenrichtung
• Minimale Messauflösung: 0,001 µm
• Wiederholungsmessgenauigkeit: (3σ) 0,01 µm
• (Höhenmessfunktion: Z-Achsenrichtung)
• Minimale Messauflösung: 0,001 µm
• Wiederholungsmessgenauigkeit: (σ) 0,01 µm

When the non-contact contour curve measurement is measured, a device having at least the resolution described below is used when the objective lens is used at 100X / NA0.95 (a hundred times magnification, numerical aperture of 0.95). As such a device, for example, a confocal microscope H300 from Lasertech co. Itd. called. In this case, σ is the standard deviation.

• (Line thickness measurement function): X-axis direction
• Minimum measurement resolution: 0.001 μm
• Repeat measurement accuracy: (3σ) 0.01 μm
• (Height measurement function: Z-axis direction)
• Minimum measurement resolution: 0.001 μm
• Repeat measurement accuracy: (σ) 0.01 μm

That is, the arithmetical average surface roughness Ra in the specification is expressed by the parameter calculation formula with reference to JIS B0601 (FIG. 2013 ) is calculated based on a result of the non-contact contour curve measurement by the apparatus having at least the above-described resolution.

The outer layer 5 is made by injection molding using the extruder. The surface roughness of the outer layer 5 can be controlled with the injection molding conditions, namely, the preset temperature and the machine speed (resin flow rate) in injection molding. For example, the surface roughness of the outer layer 5 can be further increased by setting lower the preset temperature during injection molding and increasing the resin viscosity. Also, the shear stress applied to the resin increases, and the surface roughness of the outer layer increases 5 can be further increased by setting the engine speed faster. The preset temperature and the machine speed can be suitably set with respect to the extruder size, etc. It is desirable to perform the injection molding under the condition that the arithmetical average surface roughness Ra of the surface of the outer layer 5 is not less than 3 μm (more preferably not less than 4 μm and not more than 7 μm).

Hereinafter, the measurement result of the arithmetical average surface roughness Ra of the surface of the outer layer becomes 5 described when the preset temperature and the machine speed in the injection molding of the outer layer 5 be changed.

In this case, the electrical wires 3 Double lines, and the electrical conductor 7 for the two electrode wires 3 includes cross-linked conductive rubber combined with soot. The outer diameter of the electrical conductor 7 is defined as 0.6 mm. The tubular element 4 comprises cross-linked EPDM with the outside diameter of 3.5 mm. The outer layer 5 uses the thermoplastic urethane with a degree of hardness 85 which has the thickness of 0.3 mm. The above confocal microscope H300 from Lasertech co. Itd. is used for the measurement of the arithmetic average surface roughness Ra of the surface of the outer layer 5 used. The conditions of injection molding and the measurement result of the arithmetical average surface roughness Ra of the surface of the outer layer 5 are shown substantially in Table 1 below.

Table 1 example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Extruder size (mm) 65 65 65 20 20 65 Preset cylinder temperature (° C) 204 204 204 190 190 220 Preset head temperature (° C) 204 204 204 180 185 215 Machine speed (m / min) 35 45 60 15 1.5 18 Arithmetic average surface roughness Ra (μm) 4.3 5.5 7.0 3.3 0.5 1.8 processability ○ ○ ○ ○ × ×

As shown in Table 1, where the extruder size is set to 65 mm, and when the preset cylinder temperature and preset head temperature are set to 204 ° C, the arithmetical average surface roughness Ra of the surface of the outer layer 5 is set to 4.3 μm to 7 μm, which is not less than 3 μm, by setting the machine speed at 35 to 60 m / min (Examples 1 to 3). In contrast, in Comparative Example 2, where the preset cylinder temperature is set to 220 ° C, the preset head temperature is set to 215 ° C, and the engine speed is set to 18 m / min, the arithmetic average surface roughness Ra is the surface area of the outer layer 5 1.8 μm, which is less than 3 μm.

In Example 4, where the extruder size is set to 20 mm, the preset cylinder temperature is set to 190 ° C, the preset head temperature is set to 180 ° C, and the engine speed is set to 15 m / min, the arithmetic average surface roughness Ra is the surface of the outer layer 5 3.3 μm, which is not less than 3 μm. In contrast, in Comparative Example 1, where the preset cylinder temperature is set to 190 ° C, the preset head temperature is set to 185 ° C, and the engine speed is set to 1.8 m / min, the arithmetic average surface roughness Ra is the surface area of the outer layer 5 0.5 μm, which is less than 3 μm.

Here, a diameter of a screw of the extruder increases as the extruder size increases. Increasing self-heating of the resin occurs. As the extruder size increases, therefore, an actual resin temperature may increase, and the arithmetical average surface roughness Ra of the surface of the outer layer may increase 5 can decrease even when the preset temperature is relatively low. It is therefore necessary to set a suitable preset temperature and the outer layer 5 with the average arithmetic mean surface roughness Ra of the surface of the outer layer 5 not smaller than 3 μm.

Microscope photos of the surfaces of the outer layers 5 in the examples 1 and 3 as well as in Comparative Example 1 are in the 2 (a), 3 (a) and 4 (a), respectively. The measurement results of the surface roughness in the examples 1 and 3 as well as in Comparative Example 1 are in the 2 (b), 3 (b) and 4 (b), respectively. In the measurement results in the 2 (b), 3 (b) and 4 (b), the vertical axis represents the height of the surface (height from a reference position), and the horizontal axis represents a measuring position (distance from the reference position).

As in the 2 and 3 have shown the surfaces of the outer layers 5 in the examples 1 and 3 rough surfaces. The surfaces of the outer layers 5 can hardly cause attachment. On the other hand, the surface of the outer layer has 5 in Comparative Example 1, as in 4 shown a smooth surface. It is thus understood that the surface of the outer layer 5 easily cause an attachment.

Next, the processing ability in the tail machining using the pressure-sensitive sensors 1 in the examples 1 to 4 and the comparative examples 1 . 2 rated. In this case, the processing capability in the automatic tail machining is evaluated by cutting the manufactured pressure sensitive sensor 1 to 1300 mm and inserting the cut pressure-sensitive sensor 1 in an automatic process machine.

For the automatic process machine, as in 5 (a), become two V-shaped hotblades 51 advanced so that it the pressure-sensitive sensor 1 from both opposite directions at a position 15 mm from the end of the pressure-sensitive sensor 1 pinching. Then cut through the hotblades 51 the tubular element 4 and the outer layer 5 , In this case, an advantageous amount (a shift amount) of the hot blades is 51 adjusted so that the electrode wires 3 do not get scratched. Next, as in 5 (b), the elastic insulator becomes 2 removed by a tail 54 of the elastic insulator 2 that by the hot-blades 51 is cut off, grasped and withdrawn while the pressure-sensitive sensor 1 through a clamp 52 is held. Next is the tail 54 the withdrawn elastic insulator 2 from a manipulator 53 dropped by the handle of the manipulator 53 is released. In such a case, the automatic process stops when the outer layer 5 containing the thermoplastic urethane, remains connected to the manipulator 53 and can not fall down. In this case, 2000 become pressure-sensitive sensors 1 automatically edited. The case where the automatic process is stopped at least once is defined as poor processing capability (X: error), and the case when all processes are processed without any problem is defined as good processing capability (O: successful). The result is also shown in Table 1.

As shown in Table 1, in the examples 1 to 4 where the arithmetical average surface roughness Ra of the surface of the outer layer 5 not less than 3 μm (namely, 3.3 μm to 7.0 μm) is the automatic process during the automatic processing of 2000 pressure-sensitive sensors 1 never stopped. On the other hand, in Comparative Examples 1 and 2 where the arithmetical average surface roughness Ra of the surface of the outer layer 5 less than 3 microns (namely 5.5 microns to 1.8 microns), the automatic process for the pressure-sensitive sensor 1 stopped, and it is confirmed that Comparative Examples 1 and 2 have problems in processability.

(Advantageous Effects of Embodiments)

As described above, the pressure-sensitive sensor is 1 according to the embodiment with the outer layer 5 provided, which contains thermoplastic urethane. The arithmetic average surface roughness Ra of the surface of the outer layer 5 is not less than 3 μm.

Adjusting the arithmetic average surface roughness Ra of the surface of the outer layer 5 not less than 3 μm, the surface adhesion can be prevented while using the thermoplastic urethane having high heat resistance, high oil resistance, high cold resistance and high abrasion resistance. Thus, the workability of the tail may increase.

Also, by adjusting the arithmetic average surface roughness Ra of the surface of the outer layer 5 not less than 3 μm) the peeled tail 54 of the elastic insulator 2 be prevented from working on the manipulator 53 to glue, thereby enabling automatic processing by the automatic processing machine. As a result, the mass production of the pressure-sensitive sensor 1 increase.

Further, the adjustment of the arithmetical average surface roughness Ra prevents the surface of the outer layer 5 to not less than 3 μm the appearance of gloss on the surface and causes a dull appearance. Thus, the appearance of the outer layer improves 5 ,

Other Embodiment

Next, the other embodiment of the invention will be described.

The structure of an in 6 shown pressure-sensitive sensor 61 is essentially the same as in 1 shown pressure-sensitive sensor 1 , Only the shape of the outer layer 5 is different.

The pressure-sensitive sensor 61 is with a flat connection surface 62 provided with an installation object such as a sliding door for a vehicle on an outer peripheral surface of the outer layer 5 be connected along the longitudinal direction. The pressure-sensitive sensor 61 is directly connected to the installation object by the connection interface 62 using a double-sided adhesive tape or adhesive. Therefore, the pressure-sensitive sensor 61 be easily attached to the installation object without using known elements such as protective rubber and a sensor guide.

The pressure-sensitive sensor 61 has an arithmetical average surface roughness Ra of the surface of the entire outer layer 5 including the connection surface 62 of not less than 3 μm. Thus, the pressure-sensitive sensor has 61 a rough surface. Therefore, if the pressure-sensitive sensor 61 with the installation object, the adhesion can be improved by the anchor effect.

The outer layer 5 the pressure-sensitive sensor 61 is with a flange-shaped tongue piece 63 integrated, that of an outer edge of the connection surface 62 in the width direction (the direction orthogonal to the longitudinal direction and a normal direction of the connection surface 62 , shown in the right and left direction) protrudes. The tongue piece 63 is formed so as to protrude along the width direction. The tongue piece 63 is formed symmetrically so as to project on both sides of the width direction. The tongue piece 63 is on the entire outer layer 5 formed in the longitudinal direction.

The formation of the tongue piece 63 allows a stable attachment of the pressure-sensitive sensor 61 on the installation object by enlarging an area of the connection surface 62 , And even if the connection surface 62 in a direction parallel to the connection surface 62 is pressed, allows the formation of the tongue piece 63 the contacting of the two electrode wires 3 by deformation of the tubular element 4 because the tongue piece 63 opposite to the pressed tongue piece 63 resists. Therefore, a detection angle range for the pressure in the cross section orthogonal to an extending direction of the tubular member 4 not less than 180 °. The pressure-sensitive sensor 61 can adequately detect the contact with a detection object within the detection angle range.

The in 7 shown pressure-sensitive sensor 71 is a pressure-sensitive sensor with a connection surface 62 is provided, wherein the cross-sectional shape orthogonal to the longitudinal direction of the outer layer 5 D-shaped is formed. Even if the cross section of the outer layer 5 D-shaped, as in the pressure-sensitive sensor 71 shown, the pressure-sensitive sensor 71 as well as in 6 shown pressure-sensitive sensor 61 easier to be attached to the installation object by the double-sided tape or the adhesive etc. In addition, since the arithmetic average surface roughness Ra of the bonding surface 62 is not less than 3 μm, the adhesiveness is improved by the anchor effect.

If in this case the in 7 shown pressure-sensitive sensor 71 in the direction parallel to the connection surface 62 is pressed, it is easy, a force for a separation direction at the end of the connection surface 62 to effect where the pressure is applied, and the pressure-sensitive sensor 71 can be relatively easily separated from the installation object. In terms of preventing separation from the installation object, the pressure-sensitive sensor 71 therefore preferably with the tongue piece 63 provided, as well as in 6 shown pressure-sensitive sensor 61 ,

(Summary of Embodiments)

• [1] Druckempfindlicher Sensor (1), umfassend:
  • einen schlauchförmigen elastischen Isolator (2), umfassend einen Hohlbereich (2a) entlang einer Längsrichtung; und
  • eine Mehrzahl von Elektrodendrähten (3), die entlang einer Innenumfangsoberfläche des Hohlbereichs (2a) des elastischen Isolators (2) derart angeordnet sind, dass sie einander nicht kontaktieren,
  • wobei der elastische Isolator (2) wenigstens eine äußere Schicht (5) umfasst, die ein thermoplastisches Urethan umfasst, und
  • wobei eine arithmetische mittlere Oberflächenrauigkeit Ra einer Oberfläche der äußeren Schicht (5) nicht weniger als 3 µm ist.
• [2] Druckempfindlicher Sensor (1) nach [1], wobei die arithmetische mittlere Oberflächenrauigkeit Ra der Oberfläche der äußeren Schicht (5) nicht weniger als 4µm und nicht mehr als 7µm ist.
• [3] Druckempfindlicher Sensor (1) nach [1] oder [2], wobei die Elektrodendrähte (3) einen elektrischen Leiter (7) umfassen, umfassend eine leitfähige Harzzusammensetzung, die ein thermoplastisches Styrol-Elastomer und Kohlenstoff enthält.
• [4] Druckempfindlicher Sensor (61, 71) nach einem von [1] bis [3], wobei eine Außenumfangsoberfläche der äußeren Schicht (5) eine flache Verbindungsoberfläche (62) zur festen Verbindung mit einem Installationsobjekt entlang der Längsrichtung umfasst.
• [5] Druckempfindlicher Sensor (61) nach [4], wobei die äußere Schicht (5) ein flanschförmiges Zungenstück (63) umfasst, das in einer Breitenrichtung orthogonal zur Längsrichtung und in einer Normalen-Richtung der Verbindungsoberfläche (62) vorsteht und integral an einem Umfang der Verbindungsoberfläche (62) gebildet ist.

Next, technical ideas that are understood from the embodiment will be described below by referring to the reference numerals, etc. used for the embodiment. However, any reference numerals, etc. described below should not limit the constituent elements in the claims to the elements, etc. specifically described in the embodiment.

• [1] pressure-sensitive sensor ( 1 ), full:
  • a tubular elastic insulator ( 2 ), comprising a hollow region ( 2a ) along a longitudinal direction; and
  • a plurality of electrode wires ( 3 ) along an inner circumferential surface of the hollow region ( 2a ) of the elastic insulator ( 2 ) are arranged such that they do not contact each other,
  • the elastic isolator ( 2 ) at least one outer layer ( 5 ), which comprises a thermoplastic urethane, and
  • wherein an arithmetical average surface roughness Ra of a surface of the outer layer ( 5 ) is not less than 3 μm.
• [2] pressure-sensitive sensor ( 1 ) according to [1], wherein the arithmetical average surface roughness Ra of the surface of the outer layer ( 5 ) is not less than 4 μm and not more than 7 μm.
• [3] pressure-sensitive sensor ( 1 ) according to [1] or [2], wherein the electrode wires ( 3 ) an electrical conductor ( 7 ) comprising a conductive resin composition containing a thermoplastic styrene elastomer and carbon.
• [4] pressure-sensitive sensor ( 61 . 71 ) according to any one of [1] to [3], wherein an outer peripheral surface of the outer layer ( 5 ) a flat connection surface ( 62 ) for fixed connection with an installation object along the longitudinal direction.
• [5] pressure-sensitive sensor ( 61 ) according to [4], wherein the outer layer ( 5 ) a flange-shaped tongue piece ( 63 ) in a width direction orthogonal to the longitudinal direction and in a normal direction of the bonding surface (FIG. 62 protruding and integrally at a periphery of the connecting surface ( 62 ) is formed.

Although the embodiment of the invention has been described, the invention according to the claims is not limited to the embodiment described above. It should also be noted that not all combinations of the features described in the embodiment are required to solve the problem of the invention.

The invention may be modified and implemented as appropriate without departing from the essentials.

For example, although in the above embodiment the case is described as an example in which the pressure-sensitive sensor is applied to the sliding door for the vehicle, it is not limited thereto. The invention can be applied to a sensor which detects any physical crushing by the vehicle's back door, an electric window, a lift, a shutter, an automatic door, a window, etc.

LIST OF REFERENCE NUMBERS

1

PRESSURE-SENSOR

2

ELASTIC ISOLATOR

2a

HOLLOW AREA

3

LEAD WIRE

4

TUBULAR ELEMENT

5

OUTER LAYER

6

LADDER

7

ELECTRICAL CONDUCTOR

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2011052433 A [0004]

Claims (5)

Pressure sensitive sensor comprising: a tubular elastic insulator comprising a hollow portion along a longitudinal direction; and a plurality of electrode wires arranged along an inner peripheral surface of the hollow portion of the elastic insulator so as not to contact each other, wherein the elastic insulator comprises at least one outer layer comprising a thermoplastic urethane, and wherein an arithmetic average surface roughness Ra of a surface of the outer layer is not less than 3 μm. Pressure sensitive sensor after Claim 1 wherein the arithmetic average surface roughness Ra of the surface of the outer layer is not less than 4 μm and not more than 7 μm. Pressure sensitive sensor after Claim 1 or 2 wherein the electrode wires comprise an electrical conductor comprising a conductive resin composition containing a thermoplastic styrene elastomer and carbon. Pressure-sensitive sensor according to one of Claims 1 to 3 wherein an outer peripheral surface of the outer layer comprises a flat connection surface for fixed connection with an installation object along the longitudinal direction. Pressure sensitive sensor after Claim 4 wherein the outer layer comprises a flange-shaped tongue piece projecting in a width direction orthogonal to the longitudinal direction and in a normal direction of the joining surface, and integrally formed on a circumference of the joining surface.

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