Pressure Sensor

Abstract

To provide a pressure-sensitive sensor which can easily secure an allowable bending performance while suppressing an increase in manufacturing cost.SOLUTION: A pressure-sensitive sensor 1 comprises: a first conductive member 10 formed in a long length shape, and having conductivity and elastic property; a second conductive member 20 having a long-shaped space 30 in which the first conductive member 10 is arranged, and having conductivity and elastic property; and an insulation member 40 which is a member having insulation property and elastic property and holding the first conductive member 10 away from the second conductive member 20, and can be relatively moved from at least one of the first conductive member 10 and the second conductive member 20. A difference in extension and shrinkage between the first conductive member 10 and the second conductive member 20, generated when the pressure-sensitive sensor is curved is easily absorbed by a relative movement of one of the first conductive member 10 and the second conductive member 20 and the insulation member 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pressure sensor. [Background technology]

[0002] Pressure-sensitive sensors that realize a switching function when an internal electrical conductor becomes conductive when subjected to an external force are known (see, for example, Patent Document 1). Pressure-sensitive sensors are used in opening and closing devices for doors, windows, shutters, etc., detecting passing vehicles, foot switches, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-281906 Summary of the Invention [Problem to be solved by the invention]

[0004] The pressure sensor described in Patent Document 1 has a hollow spiral structure. Specifically, the pressure sensor has a hollow structure extending in the longitudinal direction at the center. Furthermore, four electric conductors are arranged at equal intervals in the circumferential direction surrounding the hollow structure and extending in a spiral shape in the longitudinal direction.

[0005] To achieve this hollow spiral structure, the pressure sensor is manufactured using a process that uses a spacer to form a hollow structure. Specifically, the process of manufacturing the pressure sensor includes a step of arranging an electrical conductor around the spacer to form the pressure sensor, and then removing the spacer.

[0006] As a result, the pressure sensor of Patent Document 1 has a problem that the manufacturing costs tend to increase. That is, there are problems that the cost tends to increase due to the fact that the number of steps for forming the hollow structure tends to increase, the material costs for the spacer tend to increase, and the processing costs tend to increase.

[0007] In addition, the pressure sensor is disposed along the shape of the location in the opening and closing device. For example, the pressure sensor may be disposed along the shape of a convexly curved location or a concavely curved location. Depending on the internal structure of the pressure sensor, there is a problem that it may be difficult to dispose the pressure sensor along the curved shape as described above (in other words, the allowable bending performance may be poor).

[0008] The present invention has been made to solve the above-mentioned problems, and has an object to provide a pressure sensor that suppresses an increase in manufacturing costs and easily ensures allowable bending performance. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides the following means. The pressure-sensitive sensor of the present invention includes a first conductive member that is formed in an elongated shape and is conductive and elastic; a second conductive member that has an elongated space inside in which the first conductive member is disposed and is conductive and elastic; and an insulating member that is insulating and elastic, holds the first conductive member at a distance from the second conductive member, and is capable of moving relative to at least one of the first conductive member and the second conductive member.

[0010] The pressure-sensitive sensor of the present invention has a configuration in which a first conductive member and a second conductive member are coaxially arranged, and an insulating member is arranged between the first conductive member and the second conductive member, and a space is formed between the first conductive member and the second conductive member. Because of this configuration, it is possible to manufacture the pressure-sensitive sensor by a manufacturing method that does not use a spacer, such as extrusion molding, instead of the manufacturing method that uses a spacer as in the sensor described in Patent Document 1.

[0011] The insulating member and at least one of the first conductive member and the second conductive member are configured to be movable relative to each other, and therefore the difference in expansion and contraction between the first conductive member and the second conductive member that occurs when the pressure sensor is bent is easily absorbed by the relative movement. Effect of the Invention

[0012] The pressure sensor of the present invention has the advantage that it is easy to suppress an increase in manufacturing costs and to ensure allowable bending performance. [Brief description of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view illustrating a configuration of a pressure-sensitive sensor according to a first embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view illustrating a state in which a first conductive member and a second conductive member of the pressure-sensitive sensor of FIG. 1 are electrically connected. FIG. [Diagram 3] 2 is a vertical cross-sectional view illustrating a state in which the pressure-sensitive sensor in FIG. 1 is bent. [Figure 4] 4(a) is a cross-sectional view illustrating the configuration of a first modified example of the pressure-sensitive sensor of FIG. 1, and FIG. 4(b) is a cross-sectional view illustrating the configuration of a second modified example of the pressure-sensitive sensor of FIG. [Diagram 5] 5(a) is a cross-sectional view illustrating the configuration of a third modified example of the pressure-sensitive sensor of FIG. 1, and FIG. 5(b) is a cross-sectional view illustrating the configuration of a fourth modified example of the pressure-sensitive sensor of FIG. [Figure 6] 6(a) is a cross-sectional view illustrating the configuration of a fifth modified example of the pressure-sensitive sensor of FIG. 1, and FIG. 6(b) is a cross-sectional view illustrating the configuration of a sixth modified example of the pressure-sensitive sensor of FIG. [Figure 7] 7(a) is a cross-sectional view illustrating the configuration of a seventh modified example of the pressure-sensitive sensor of FIG. 1, and FIG. 7(b) is a cross-sectional view illustrating the configuration of an eighth modified example of the pressure-sensitive sensor of FIG. [Figure 8] 1. FIG. 15 is a cross-sectional view illustrating the configuration of a ninth modified example of the pressure-sensitive sensor of FIG. [Figure 9] FIG. 5 is a cross-sectional view illustrating the configuration of a pressure-sensitive sensor according to a second embodiment of the present invention. [Figure 10] 10(a) is a cross-sectional view illustrating the configuration of a first modified example of the pressure-sensitive sensor of FIG. 9, and FIG. 10(b) is a cross-sectional view illustrating the configuration of a second modified example of the pressure-sensitive sensor of FIG. [Figure 11] FIG. 11(a) is a cross-sectional view illustrating the configuration of a third modified example of the pressure-sensitive sensor of FIG. 9, and FIG. 11(b) is a cross-sectional view illustrating the configuration of a fourth modified example of the pressure-sensitive sensor of FIG. [Figure 12] 12(a) is a cross-sectional view illustrating the configuration of a fifth modified example of the pressure-sensitive sensor of FIG. 9, and FIG. 12(b) is a cross-sectional view illustrating the configuration of a sixth modified example of the pressure-sensitive sensor of FIG. [Figure 13] FIG. 13(a) is a cross-sectional view illustrating the configuration of a seventh modified example of the pressure-sensitive sensor of FIG. 9, and FIG. 13(b) is a cross-sectional view illustrating the configuration of an eighth modified example of the pressure-sensitive sensor of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] [First embodiment] Hereinafter, a pressure-sensitive sensor 1 according to a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 8. The pressure-sensitive sensor 1 of this embodiment has a columnar or cylindrical shape having a desired length. Fig. 1 shows the cross-sectional configuration of the pressure-sensitive sensor 1 according to the first embodiment.

[0015] The pressure sensor 1 has a shape that extends toward the front and rear of the paper surface in Fig. 1. In this embodiment, the pressure sensor 1 has a diameter of 4 mm. The diameter of the pressure sensor 1 may be smaller or larger than 4 mm.

[0016] As shown in FIG. 1, the pressure-sensitive sensor 1 mainly includes a first conductive member 10, a second conductive member 20, a first insulating member (corresponding to an insulating member) 40, and a second insulating member 50. The first conductive member 10 is a member disposed inside the second conductive member 20. The first conductive member 10 is a member formed into a cylindrical shape using a material that is both conductive and elastic. In this embodiment, the first conductive member 10 is described as having a circular shape in cross section. An example of a material for forming the first conductive member 10 is conductive rubber containing carbon black.

[0017] The first conductive member 10 is provided with a first conductor 11. The first conductor 11 is a wire made of a metal material having electrical conductivity. The first conductor 11 is disposed along the center line of the cylindrical first conductive member 10. In other words, the first conductor 11 is disposed coaxially with the first conductive member 10. Note that the first conductor 11 may be disposed at a location other than the center line of the first conductive member 10 as long as it is disposed so as to be capable of conducting electricity with the first conductive member 10.

[0018] The second conductive member 20 is a cylindrical member in which the first conductive member 10 and the first insulating member 40 are disposed in an internal space 30. The second conductive member 20 is a member formed using a material that is both conductive and elastic. An example of a material for forming the second conductive member 20 is conductive rubber such as polyolefin containing carbon black.

[0019] The second conductive member 20 is provided with a second conductor 21. The second conductor 21 is a wire made of a metal material having electrical conductivity. The second conductor 21 is disposed along the longitudinal direction within the peripheral wall of the cylindrical second conductive member 20.

[0020] In this embodiment, the second conductor 21 is disposed at a position (also referred to as a phase) opposite to the first insulating member 40 sandwiching the first conductive member 10. Note that the position at which the second conductor 21 is disposed in the second conductive member 20 may be the position opposite to the first insulating member 40 described above, or may be another position.

[0021] In this embodiment, the first conductor 11 and the second conductor 21 are tin-plated soft copper strands. The metal material forming the first conductor 11 and the second conductor 21 may be a copper alloy containing copper, silver, or a silver alloy containing silver.

[0022] The first insulating member 40 is a cylindrical member that is disposed in the space 30 of the second conductive member 20 together with the first conductive member 10. The diameter of the first insulating member 40 is equal to the radial distance from the first conductive member 10 to the second conductive member 20.

[0023] The first insulating member 40 is arranged in a spiral shape along the circumferential surface, which is the surface of the first conductive member 10. In this embodiment, the first insulating member 40 is described as a member that holds the first conductive member 10 in a position coaxial with the second conductive member 20.

[0024] The amount of movement (also referred to as the helical pitch) in the longitudinal direction when the first insulating member 40 makes one revolution around the first conductive member 10 can be determined appropriately and is not particularly limited. An example of a material for forming the first insulating member 40 is a rubber material having insulating properties such as polyolefin.

[0025] In this embodiment, the portion of the first insulating member 40 that comes into contact with the first conductive member 10 is fused to the first conductive member 10. In other words, it is fixed to the first conductive member 10. On the other hand, the portion of the first insulating member 40 that comes into contact with the second conductive member 20 is not fused to the second conductive member 20. In other words, it is capable of moving relative to the second conductive member 20. Using the same rubber material for the first insulating member 40 and the first conductive member 10 makes it easier to fix them by fusion.

[0026] In the present embodiment, the description is applied to an example in which the first insulating member 40 and the first conductive member 10 are fused and the first insulating member 40 and the second conductive member 20 are not fused, but the first insulating member 40 and the first conductive member 10 may not be fused and the first insulating member 40 and the second conductive member 20 may be fused. Furthermore, the first insulating member 40 and the first conductive member 10 may not be fused and the first insulating member 40 and the second conductive member 20 may not be fused.

[0027] The second insulating member 50 is a cylindrical member that covers the outer circumferential surface of the second conductive member 20, and is a member that constitutes the outer shape of the pressure-sensitive sensor 1. An example of a material that forms the second insulating member 50 is a rubber material having insulating properties, such as polyurethane.

[0028] In this embodiment, the portion of the second insulating member 50 that comes into contact with the second conductive member 20 is not fused to the second conductive member 20. In other words, the portion is capable of moving relative to the second conductive member 20. The second insulating member 50 may be fused to the second conductive member 20. In other words, the second insulating member 50 may be fixed to the second conductive member 20.

[0029] Next, a description will be given of the operation of the pressure-sensitive sensor 1 configured as above. Fig. 2 shows a state in which the first conductive member 10 and the second conductive member 20 of the pressure-sensitive sensor 1 are conductive. When no pressing force P is applied to the pressure sensor 1, the first conductive member 10 and the second conductive member 20 are separated by the space 30 and the first insulating member 40 as shown in Fig. 1. In other words, the first conductive member 10 and the second conductive member 20 are also electrically separated from each other.

[0030] When a pressing force P is applied to the pressure sensor 1, the second insulating member 50 and the second conductive member 20 are elastically deformed as shown in Fig. 2. In this embodiment, an example will be described in which a pressing force P is applied from the outside toward the first conductive member 10. The portion of the second conductive member 20 to which the pressing force P is applied deforms toward the first conductive member 10 and comes into contact with the first conductive member 10. In other words, the first conductive member 10 and the second conductive member 20 become conductive.

[0031] It is possible to detect whether a pressing force P is applied to the pressure sensor 1 based on whether there is conductivity between the first conductive member 10 and the second conductive member 20 in the pressure sensor 1. It is also possible to detect whether a pressing force P is applied to the pressure sensor 1 based on the resistance value between the first conductive member 10 and the second conductive member 20.

[0032] Next, a case where the pressure-sensitive sensor 1 having the above-mentioned configuration is bent will be described. Fig. 3 shows the state where the pressure-sensitive sensor 1 is bent. When the pressure sensor 1 is bent, as shown in FIG. 3, a force acts in a contracting direction on the inner portion of the pressure sensor 1 (the left portion in FIG. 3) and a force acts in an expanding direction on the outer portion (the right portion in FIG. 3).

[0033] The contraction and expansion forces acting on the second conductive member 20 arranged on the outer periphery of the pressure sensor 1 are stronger than the contraction and expansion forces acting on the first conductive member 10 arranged at the center of the pressure sensor 1.

[0034] The second conductive member 20 is not fused to the first insulating member 40 and is therefore in contact with the first insulating member 40 so as to be able to move relatively therewith. Therefore, the inner portion of the second conductive member 20 contracts while moving relative to the first insulating member 40 in the longitudinal direction. Moreover, the outer portion of the second conductive member 20 expands while moving relative to the first insulating member 40 in the longitudinal direction.

[0035] In contrast, when the second conductive member 20 is fused and integrated with the first insulating member 40, the inner portion of the second conductive member 20 is restrained by the first insulating member 40 and the first conductive member 10 and is therefore less likely to shrink. Moreover, the outer portion of the second conductive member 20 is restrained by the first insulating member 40 and the first conductive member 10 and is therefore less likely to stretch.

[0036] In addition, the contraction force and expansion force acting on the second insulating member 50, which is arranged on the outer periphery side of the second conductive member 20, are stronger than the contraction force and expansion force acting on the second conductive member 20, which is arranged on the center side.

[0037] The second insulating member 50 is not fused to the second conductive member 20 and is in contact with the second conductive member 20 so as to be movable relative to the second conductive member 20. Therefore, the inner portion of the second insulating member 50 contracts while moving relative to the second conductive member 20 in the longitudinal direction. Moreover, the outer portion of the second insulating member 50 expands while moving relative to the second conductive member 20 in the longitudinal direction.

[0038] In contrast, when the second insulating member 50 is fused and integrated with the second conductive member 20, the inner portion of the second insulating member 50 is restrained by the second conductive member 20 and is therefore less likely to shrink. Also, the outer portion of the second insulating member 50 is restrained by the second conductive member 20 and is therefore less likely to stretch.

[0039] Next, an example of a method for manufacturing the pressure-sensitive sensor 1 having the above configuration will be described with reference to FIG. First, a known manufacturing method such as extrusion molding is used to form the first conductive member 10. The first conductive member 10 is formed in a cylindrical shape with the first conductor 11 disposed therein.

[0040] Thereafter, the cylindrical first insulating member 40 is arranged in a spiral shape around the first conductive member 10. The first insulating member 40 is formed by using a known manufacturing method such as extrusion molding. When arranging the first insulating member 40, the first conductive member 10 and the first insulating member 40 are controlled so that they are heated to a temperature at which they fuse to each other. The fusion temperature is determined according to the type of material constituting the first conductive member 10 and the first insulating member 40. The first conductive member 10 and the first insulating member 40 may be fixed by an adhesive.

[0041] Next, the cylindrical second conductive member 20 is provided around the first insulating member 40. At this time, a space 30 is formed between the first conductive member 10 and the second conductive member 20. The second conductive member 20 is formed using a known manufacturing method such as extrusion molding. When the second conductive member 20 is arranged, the first insulating member 40 and the second conductive member 20 are controlled at a temperature at which they are not fused to each other.

[0042] The temperature at which non-fusion occurs is a temperature lower than the temperature at which the first insulating member 40 and the second conductive member 20 are fused together. The temperature at which non-fusion occurs is determined depending on the type of material that constitutes the first insulating member 40 and the second conductive member 20.

[0043] Next, a cylindrical second insulating member 50 is provided around the second conductive member 20. The second insulating member 50 is formed using a known manufacturing method such as extrusion molding. When the second insulating member 50 is arranged, the second conductive member 20 and the second insulating member 50 are controlled at a temperature at which they are not fused to each other. Through the above steps, the pressure sensor 1 is manufactured.

[0044] The temperature at which non-fusion occurs is a temperature lower than the temperature at which the second conductive member 20 and the second insulating member 50 are fused. The temperature at which non-fusion occurs is determined depending on the type of material constituting the second conductive member 20 and the second insulating member 50.

[0045] The pressure-sensitive sensor 1 has a configuration in which the first conductive member 10 and the second conductive member 20 are coaxially arranged, and the first insulating member 40 is arranged between the first conductive member 10 and the second conductive member 20, and a space 30 is formed between the first conductive member 10 and the second conductive member 20. Because of this configuration, it is possible to manufacture the pressure-sensitive sensor 1 by a manufacturing method that does not use a spacer, such as extrusion molding, and it is easy to suppress an increase in manufacturing costs.

[0046] The pressure-sensitive sensor 1 has a configuration in which the first insulating member 40 and the second conductive member 20 are relatively movable. Therefore, the difference in expansion and contraction between the first conductive member 10 and the second conductive member 20 that occurs when the pressure-sensitive sensor 1 is bent is easily absorbed by the relative movement between the first insulating member 40 and the second conductive member 20. In other words, the allowable bending performance of the pressure-sensitive sensor 1 is easily ensured.

[0047] Even if the first insulating member 40 and the first conductive member 10 are configured to be relatively movable, it is easy to ensure the allowable bending performance of the pressure-sensitive sensor 1. Furthermore, by having a configuration in which the second insulating member 50 and the second conductive member 20 are configured to be relatively movable, it is even easier to ensure the allowable bending performance of the pressure-sensitive sensor 1.

[0048] By arranging the first insulating members 40 in a spiral shape around the first conductive member 10, it is possible to hold the first conductive member 10 away from the second conductive member 20 with one first insulating member 40. Compared to the case where a plurality of first insulating members 40 are provided, the second conductive member 20 is more likely to deform when subjected to an external force, and the second conductive member 20 and the first conductive member 10 are more likely to come into contact with each other. In addition, the number of first insulating members 40 can be reduced, which makes it easier to reduce manufacturing costs.

[0049] The pressure sensor 1 is not limited to the shape described in the above embodiment, and may have other shapes. For example, the pressure sensor 1 may have various shapes described below.

[0050] 4(a) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 1A. The pressure-sensitive sensor 1A differs from the pressure-sensitive sensor 1 in the shape of the first insulating member 40A. The components other than the first insulating member 40A have the same shape as the pressure-sensitive sensor 1.

[0051] The first insulating member 40A is a member formed in a rectangular column shape. The first insulating member 40A is arranged in a spiral shape along the circumferential surface of the first conductive member 10. The first insulating member 40A has a substantially rectangular shape extending in the radial direction from the first conductive member 10 toward the second conductive member 20 in a cross-sectional view.

[0052] The surface of the first insulating member 40A that comes into contact with the first conductive member 10 has a concave curved shape that follows the circumferential surface of the first conductive member 10, and is fused to the first conductive member 10. The surface of the first insulating member 40A that comes into contact with the second conductive member 20 has a convex curved shape that follows the inner circumferential surface of the second conductive member 20, and is not fused to the second conductive member 20.

[0053] Because the first insulating member 40A is a member formed in a rectangular column shape, it is easier to increase the area of ​​contact with the first conductive member 10 and the second conductive member 20 compared to the first insulating member 40 formed in a cylindrical shape. Therefore, the first insulating member 40A can easily hold the first conductive member 10 stably.

[0054] 4(b) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 1B. The pressure-sensitive sensor 1B is different from the pressure-sensitive sensor 1 in the shapes of the second conductive member 20B and the first insulating member 40B. The components other than the second conductive member 20B and the first insulating member 40B have the same shapes as the pressure-sensitive sensor 1.

[0055] The second conductive member 20B is a cylindrical member in which the first conductive member 10 and the first insulating member 40B are disposed in an internal space 30. The second conductive member 20B is provided with a slit 22B in which an end of the first insulating member 40B is disposed. The slit 22B is a groove-shaped cutout formed in the second conductive member 20B, and is formed to extend spirally in the longitudinal direction along the circumferential surface of the second conductive member 20B.

[0056] The first insulating member 40B is a member formed in a rectangular column shape like the first insulating member 40A. An end of the first insulating member 40B on the second conductive member 20B side passes through the inside of the slit 22B and contacts the inner circumferential surface of the second insulating member 50.

[0057] The first insulating member 40B is not fused to the second conductive member 20B, and is also not fused to the second insulating member 50. In other words, the first insulating member 40B is capable of moving relative to the second conductive member 20B and the second insulating member 50.

[0058] Since the end of the first insulating member 40B passes through the inside of the slit 22B, it is easier to maintain the positional relationship between the first insulating member 40B and the second conductive member 20B compared to the pressure-sensitive sensor 1 and the pressure-sensitive sensor 1A.

[0059] 5(a) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 1C. The pressure-sensitive sensor 1C is different from the pressure-sensitive sensor 1 in the shape of the first insulating member 40C. The components other than the first insulating member 40C have the same shape as the pressure-sensitive sensor 1.

[0060] The first insulating member 40C is a member arranged in a spiral shape along the circumferential surface of the first conductive member 10. In cross-sectional view, the first insulating member 40C has a shape that extends in the radial direction from the first conductive member 10 toward the second conductive member 20, and has a shape that has a constriction 41C.

[0061] The surface of the first insulating member 40C that comes into contact with the first conductive member 10 has a concave curved shape that follows the circumferential surface of the first conductive member 10, and is fused to the first conductive member 10. The surface of the first insulating member 40C that comes into contact with the second conductive member 20 has a convex curved shape that follows the inner circumferential surface of the second conductive member 20, and is not fused to the second conductive member 20.

[0062] The constriction 41C is provided on each of a pair of surfaces of the first insulating member 40C between the first conductive member 10 and the second conductive member 20. In this embodiment, the constriction 41C is described as being a groove formed in a substantially V-shape in the first insulating member 40C.

[0063] By providing the pair of constrictions 41C, the first insulating member 40C has a narrower width and is more likely to buckle (or bend) than when the constrictions 41C are not provided. Therefore, the first conductive member 10 and the second conductive member 20 are more likely to approach each other and come into contact with each other than when the constrictions 41C are not provided.

[0064] In this embodiment, the first insulating member 40C is described as having a pair of constrictions 41C, but a single constriction 41C may be provided. The shape of the constriction 41C may be V-shaped or U-shaped or other shape that makes it easier to buckle the first insulating member 40C. The position of the constriction 41 is preferably near the middle between the circumferential surface of the first conductive member 10 and the circumferential surface of the second conductive member 20, which makes it easier to buckle.

[0065] 5(b) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 1D. The pressure-sensitive sensor 1D differs from the pressure-sensitive sensor 1 in the shape of the first insulating member 40D. The components other than the first insulating member 40D have the same shapes as the pressure-sensitive sensor 1.

[0066] The first insulating member 40D is a member arranged in a spiral shape along the circumferential surface of the first conductive member 10. The first insulating member 40D has a curved rectangular shape extending radially from the first conductive member 10 toward the second conductive member 20 in a cross-sectional view.

[0067] The surface of first insulating member 40D that comes into contact with first conductive member 10 has a concave curved shape that follows the circumferential surface of first conductive member 10, and is fused to the first conductive member 10. The surface of first insulating member 40D that comes into contact with second conductive member 20 has a convex curved shape that follows the inner circumferential surface of second conductive member 20, and is not fused to second conductive member 20.

[0068] One surface 41D of a pair of surfaces of first insulating member 40D between first conductive member 10 and second conductive member 20 has a convexly curved shape, and the other surface 42D of the pair of surfaces has a concavely curved shape.

[0069] In this embodiment, the first insulating member 40D has a curved shape that is convex in the counterclockwise direction in Fig. 5(b) but the first insulating member 40D may have a curved shape that is convex in the clockwise direction. In the embodiment shown in Fig. 5(b), the first insulating member 40D is arranged in a spiral shape in the counterclockwise direction along the circumferential surface of the first conductive member 10.

[0070] Since the first insulating member 40D has a curved rectangular shape, it is more likely to buckle (or bend) when pressure P is applied compared to a case where it does not have a curved rectangular shape. Therefore, the first conductive member 10 and the second conductive member 20 are more likely to come into contact with each other.

[0071] 6(a) is a cross-sectional view illustrating the configuration of a pressure-sensitive sensor 1E. The pressure-sensitive sensor 1E differs from the pressure-sensitive sensor 1 in the shape of a first insulating member 40E. The components other than the first insulating member 40E have the same shapes as the pressure-sensitive sensor 1.

[0072] The first insulating member 40E is a member formed in a cylindrical shape. The first insulating member 40E is arranged in a spiral shape along the circumferential surface of the first conductive member 10. In a cross-sectional view, the first insulating member 40E has an outer circumferential surface 41E and an inner circumferential surface 42E.

[0073] The diameter of outer circumferential surface 41E is equal to the radial distance from first conductive member 10 to second conductive member 20. Outer circumferential surface 41E is in contact with first conductive member 10 and second conductive member 20.

[0074] A portion of outer circumferential surface 41E of first insulating member 40E that contacts first conductive member 10 is fused to first conductive member 10. A portion of outer circumferential surface 41E of first insulating member 40E that contacts second conductive member 20 is not fused to second conductive member 20.

[0075] The first insulating member 40E has a hollow cylindrical shape and is therefore more likely to be crushed when a pressing force P is applied, compared to a case in which the first insulating member 40E has a solid shape. Therefore, the first conductive member 10 and the second conductive member 20 are more likely to come into contact with each other.

[0076] 6(b) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 1F. The pressure-sensitive sensor 1F is different from the pressure-sensitive sensor 1 in the shapes of the first conductive member 10F and the first insulating member 40F. The components other than the first conductive member 10F and the first insulating member 40F have the same shapes as the pressure-sensitive sensor 1.

[0077] The first conductive member 10F is a member formed in a substantially cylindrical shape. A concave groove 12F in which the first insulating member 40F is disposed is formed on the peripheral surface of the first conductive member 10F. The groove 12F is formed to extend in a spiral shape in the longitudinal direction of the first conductive member 10F.

[0078] The first insulating member 40F is a member formed in a cylindrical shape. The first insulating member 40F is arranged in a spiral shape along the groove 12F of the first conductive member 10F. In a cross-sectional view, the diameter of the first insulating member 40F is larger than the radial distance from the first conductive member 10F to the second conductive member 20.

[0079] The first insulating member 40F is fused to the first conductive member 10F in the groove 12F. A portion of the first insulating member 40F that contacts the inner circumferential surface of the second conductive member 20 is not fused to the second conductive member 20.

[0080] Since the first insulating member 40E is disposed in the groove 12F of the first conductive member 10F, it is easy to ensure the contact area between the first insulating member 40E and the first conductive member 10F. In other words, it is easy to ensure the fusion area between the first insulating member 40E and the first conductive member 10F.

[0081] 7(a) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 1G. The pressure-sensitive sensor 1G differs from the pressure-sensitive sensor 1 in the shape of a first insulating member 40G. The components other than the first insulating member 40G have the same shapes as the pressure-sensitive sensor 1.

[0082] The first insulating member 40G is a member formed in a substantially cylindrical shape. In a cross-sectional view, the diameter of the first insulating member 40G is larger than the radial distance from the first conductive member 10 to the second conductive member 20. The first insulating member 40G is arranged in a spiral shape along the circumferential surface of the first conductive member 10.

[0083] A concave groove 41G in which the first conductive member 10 is disposed is formed on the circumferential surface of the first insulating member 40G. The first insulating member 40G is fused to the first conductive member 10 in the groove 41G. A portion of the first insulating member 40G that contacts the inner circumferential surface of the second conductive member 20 is not fused to the second conductive member 20.

[0084] Since the first conductive member 10 is disposed in the groove 41G of the first insulating member 40G, it is easy to ensure the contact area between the first insulating member 40G and the first conductive member 10. In other words, it is easy to ensure the fusion area between the first insulating member 40G and the first conductive member 10.

[0085] 7(b) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 1H. The pressure-sensitive sensor 1H differs from the pressure-sensitive sensor 1 in the shapes of the first conductive member 10H, the first insulating member 40H, and the second insulating member 50H. The components other than the first insulating member 40H have the same shapes as the pressure-sensitive sensor 1.

[0086] The first conductive member 10H is a member formed in a substantially cylindrical shape. A concave groove 12H in which the first insulating member 40H is disposed is formed on the peripheral surface of the first conductive member 10H. The groove 12H is formed to extend in a spiral shape in the longitudinal direction of the first conductive member 10H.

[0087] The first insulating member 40H is a member formed in a cylindrical shape. The first insulating member 40H is arranged in a spiral shape along the groove 12H of the first conductive member 10H. In a cross-sectional view, the first insulating member 40H has an outer peripheral surface 41H and an inner peripheral surface 42H. The diameter of the first insulating member 40H is larger than the radial distance from the first conductive member 10H to the second conductive member 20.

[0088] The first insulating member 40H is fused to the first conductive member 10H in the groove 12H. A portion of the first insulating member 40H that contacts the inner circumferential surface of the second conductive member 20 is not fused to the second conductive member 20.

[0089] The second insulating member 50H is a member that covers the outer peripheral surface of the second conductive member 20, and is a member that constitutes the outer shape of the pressure-sensitive sensor 1H. The second insulating member 50H has an outer shape that is D-shaped in cross section.

[0090] Specifically, the second insulating member 50H has a curved surface 51H extending along the second conductive member 20, a pair of side surfaces 52H, 52H having a planar shape extending from both ends of the curved surface 51H, and an end surface 53H arranged between the pair of side surfaces 52H, 52H and having a planar shape.

[0091] Since the second insulating member 50H has the end surface 53H, the pressure sensor 1H can be easily arranged. In other words, when arranging the pressure sensor 1H, the arrangement posture of the pressure sensor 1H can be easily stabilized by contacting the end surface 53H with the arrangement target. The stable arrangement posture of the pressure sensor 1H makes it easier to arrange the pressure sensor 1H.

[0092] 8 is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 1J. The pressure-sensitive sensor 1J is different from the pressure-sensitive sensor 1 in the shapes of the first conductive member 10J and the first insulating member 40J. The components other than the first conductive member 10J and the first insulating member 40J have the same shapes as the pressure-sensitive sensor 1.

[0093] The first conductive member 10J is a member formed in a substantially cylindrical shape having an elliptical shape in a cross-sectional view. The first conductive member 10J is formed such that the elliptical shape rotates in the longitudinal direction of the first conductive member 10J.

[0094] A concave groove 12J in which a first insulating member 40J is disposed is formed on the peripheral surface of the first conductive member 10J. More specifically, the groove 12J is formed at a position where the minor axis of the ellipse intersects with the peripheral surface.

[0095] The first insulating member 40J is a member formed in a cylindrical shape. The first insulating member 40J is arranged in a spiral shape along the groove 12J of the first conductive member 10J. In a cross-sectional view, the first insulating member 40J has an outer peripheral surface 41J and an inner peripheral surface 42J. The diameter of the first insulating member 40J is larger than the maximum value of the radial distance from the first conductive member 10J to the second conductive member 20.

[0096] The first insulating member 40J is fused to the first conductive member 10J in the groove 12J. A portion of the first insulating member 40J that contacts the inner circumferential surface of the second conductive member 20 is not fused to the second conductive member 20.

[0097] Since the cross-sectional shape of the first conductive member 10J is elliptical, it is easy to shorten the shortest distance between the first conductive member 10J and the inner circumferential surface of the second conductive member 20. Specifically, the distance between the intersection point of the circumferential surface of the first conductive member 10J with the major axis of the elliptical shape and the inner circumferential surface of the second conductive member 20 is easier to shorten than when the cross-sectional shape is circular. Therefore, it is easy to bring the first conductive member 10J and the second conductive member 20 into contact with each other.

[0098] Second Embodiment Next, a pressure-sensitive sensor according to a second embodiment of the present invention will be described with reference to Figures 9 to 13. The basic configuration of the pressure-sensitive sensor of this embodiment is similar to that of the first embodiment, but the number of first insulating members is different from that of the first embodiment. Therefore, in this embodiment, components related to the first insulating members will be described with reference to Figures 9 to 13, and descriptions of the same components will be omitted.

[0099] As shown in FIG. 1, the pressure-sensitive sensor 100 of this embodiment mainly includes a first conductive member 10, a second conductive member 20, a first insulating member (corresponding to an insulating member) 140, and a second insulating member 50.

[0100] The first insulating member 140 is a cylindrical member that is disposed in the space 30 of the second conductive member 20 together with the first conductive member 10. The diameter of the first insulating member 140 is equal to the radial distance from the first conductive member 10 to the second conductive member 20.

[0101] In this embodiment, three first insulating members 140 are disposed in the space 30. This embodiment will be described by applying it to an example in which the three first insulating members 140 are arranged around the first conductive member 10 at equal intervals in the circumferential direction.

[0102] The first insulating members 140 may or may not be arranged at equal intervals. More specifically, it is sufficient that one first insulating member 140 is arranged on an imaginary line L passing through the center of the first conductive member 10. The number of first insulating members 140 arranged may be three or more than three.

[0103] In addition, in this embodiment, the description will be given by applying the present invention to an example in which the second conductor 21 is disposed between the first insulating members 140 arranged in the circumferential direction. For example, the description will be given by applying the present invention to an example in which the first insulating member 140 is disposed in the center of the adjacent first insulating members 140. Note that the first insulating member 140 may be disposed in the center of the adjacent first insulating members 140, or may be disposed in a position close to one of the first insulating members 140.

[0104] In this embodiment, the first insulating member 140 is described as being spirally disposed along the circumferential surface, which is the surface of the first conductive member 10. Note that the first insulating member 140 may be disposed so as to extend linearly along the longitudinal direction of the first conductive member 10.

[0105] The amount of movement (also referred to as the helical pitch) in the longitudinal direction when the first insulating member 140 makes one revolution around the first conductive member 10 can be determined appropriately and is not particularly limited. An example of a material for forming the first insulating member 140 is a rubber material having insulating properties such as polyolefin.

[0106] In this embodiment, the portion of the first insulating member 140 that comes into contact with the first conductive member 10 is fused to the first conductive member 10. In other words, it is fixed to the first conductive member 10. On the other hand, the portion of the first insulating member 140 that comes into contact with the second conductive member 20 is not fused to the second conductive member 20. In other words, it is capable of moving relative to the second conductive member 20.

[0107] In the present embodiment, the description is applied to an example in which the first insulating member 140 and the first conductive member 10 are fused and the first insulating member 140 and the second conductive member 20 are not fused, but the first insulating member 140 and the first conductive member 10 may not be fused and the first insulating member 140 and the second conductive member 20 may be fused. Furthermore, the first insulating member 140 and the first conductive member 10 may not be fused and the first insulating member 140 and the second conductive member 20 may not be fused.

[0108] The conduction state and the behavior when bent in the pressure-sensitive sensor 100 having the above configuration are similar to those in the pressure-sensitive sensor 1 of the first embodiment, and therefore a description thereof will be omitted.

[0109] According to the pressure-sensitive sensor 100 having the above configuration, the three first insulating members 140 can hold the first conductive member 10 at a distance from the second conductive member 20. Compared to the case where one first insulating member 140 is provided, it is easier to hold the first conductive member 10 at a distance from the second conductive member 20.

[0110] By disposing one first insulating member 140 on the imaginary line L with the first conductive member 10 in between, the second conductive member 20 is more likely to deform when subjected to an external force acting in the direction of the imaginary line L, compared to a case in which two first insulating members 140 are disposed. In other words, the second conductive member 20 and the first conductive member 10 are more likely to come into contact with each other. In addition, the pressure sensor 100 is more likely to bend in the direction of the imaginary line L.

[0111] The pressure sensor 100 is not limited to the shape described in the above embodiment, and may have other shapes. For example, the pressure sensor 100 may have various shapes described below.

[0112] 10(a) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 100A. The pressure-sensitive sensor 100A is different from the pressure-sensitive sensor 100 in the shape of the first insulating member 140A. The components other than the first insulating member 140A have the same shapes as the pressure-sensitive sensor 100.

[0113] The three first insulating members 140A are members formed in a rectangular column shape similar to the first insulating member 40A. The three first insulating members 140A are arranged in a spiral shape along the circumferential surface of the first conductive member 10. The three first insulating members 140A may be arranged to extend linearly along the longitudinal direction of the first conductive member 10.

[0114] The three first insulating members 140A may or may not be arranged at equal intervals in the circumferential direction around the first conductive member 10, similar to the first insulating members 140. The number of first insulating members 140A arranged may be three or more than three.

[0115] The surface of the first insulating member 140A that comes into contact with the first conductive member 10 has a concave curved shape that follows the circumferential surface of the first conductive member 10, and is fused to the first conductive member 10. The surface of the first insulating member 140A that comes into contact with the second conductive member 20 has a convex curved shape that follows the inner circumferential surface of the second conductive member 20, and is not fused to the second conductive member 20. In other words, the first insulating member 140A is capable of moving relative to the second conductive member 20.

[0116] In this embodiment, the description is applied to an example in which the first insulating member 140A and the first conductive member 10 are fused and the first insulating member 140A and the second conductive member 20 are not fused, but the first insulating member 140A and the first conductive member 10 may not be fused and the first insulating member 140A and the second conductive member 20 may be fused. Furthermore, the first insulating member 140A and the first conductive member 10 may not be fused and the first insulating member 140A and the second conductive member 20 may not be fused.

[0117] 10(b) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 100B. The pressure-sensitive sensor 1B is different from the pressure-sensitive sensor 100 in the shapes of the second conductive member 120B and the first insulating member 140B. The components other than the second conductive member 120B and the first insulating member 140B have the same shapes as the pressure-sensitive sensor 100.

[0118] The second conductive member 120B is a cylindrical member in which the first conductive member 10 and the first insulating member 140B are disposed in an internal space 30. The second conductive member 120B is provided with three slits 122B in which the ends of the first insulating member 140B are disposed.

[0119] The three slits 122B are groove-shaped cutouts formed in the second conductive member 120B, and are formed to extend spirally in the longitudinal direction along the circumferential surface of the second conductive member 120B. The three slits 122B may be arranged side by side at equal intervals in the circumferential direction of the second conductive member 120B, or may not be arranged at equal intervals.

[0120] Second conductive member 120B is divided into three by three slits 122B, and each of second conductive members 120B is provided with a second conductor 121B. The three second conductors 121B are wires made of a conductive metal material.

[0121] The three first insulating members 140B are members formed in a rectangular column shape like the first insulating members 140A. The three first insulating members 140B are arranged in a spiral shape along the circumferential surface of the first conductive member 10. An end of the first insulating member 140B on the second conductive member 120B side passes through the inside of the slit 122B and contacts the inner circumferential surface of the second insulating member 50.

[0122] The first insulating member 140B is not fused to the second conductive member 120B, and is also not fused to the second insulating member 50. In other words, the first insulating member 140B is capable of moving relative to the second conductive member 120B and the second insulating member 50.

[0123] In this embodiment, the slit 122B and the first insulating member 140B extend in a spiral shape, but they may extend in a straight line. The number of the slits 122B and the first insulating member 140B may be three or more.

[0124] 11(a) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 100C. The pressure-sensitive sensor 100C differs from the pressure-sensitive sensor 100 in the shape of the first insulating member 140C. The components other than the first insulating member 140C have the same shapes as the pressure-sensitive sensor 100.

[0125] The three first insulating members 140C are members arranged in a spiral shape along the circumferential surface of the first conductive member 10. In cross-sectional view, the first insulating member 140C has a shape that extends in the radial direction from the first conductive member 10 toward the second conductive member 20, and has a shape that has a constriction 41C.

[0126] The surface of the first insulating member 140C that comes into contact with the first conductive member 10 has a concave curved shape that follows the circumferential surface of the first conductive member 10, and is fused to the first conductive member 10. The surface of the first insulating member 140C that comes into contact with the second conductive member 20 has a convex curved shape that follows the inner circumferential surface of the second conductive member 20, and is not fused to the second conductive member 20. In other words, the first insulating member 140C is capable of moving relative to the second conductive member 20.

[0127] The constriction 41C is provided on each of a pair of surfaces of the first insulating member 140C between the first conductive member 10 and the second conductive member 20. In this embodiment, the constriction 41C is described as being a groove formed in a substantially V-shape in the first insulating member 140C.

[0128] The first insulating member 140C is provided with the pair of constrictions 41C, so that the width of the first insulating member 140C is narrower and the first insulating member 140C is more likely to buckle (or bend) than if the constrictions 41C were not provided.

[0129] In this embodiment, a pair of constrictions 41C is provided, but one constriction 41C may be provided. The shape of constriction 41C may be V-shaped or U-shaped, or other shape that easily buckles first insulating member 140C.

[0130] In this embodiment, the first insulating member 140C extends in a spiral shape, but may extend in a straight line. The number of the first insulating members 140C may be three or more.

[0131] 11(b) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 100D. The pressure-sensitive sensor 100D differs from the pressure-sensitive sensor 100 in the shape of the first insulating member 140D. The components other than the first insulating member 140D have the same shapes as the pressure-sensitive sensor 100.

[0132] The three first insulating members 140D are members arranged in a spiral shape along the circumferential surface of the first conductive member 10. The first insulating member 140D has a curved rectangular shape extending radially from the first conductive member 10 toward the second conductive member 20 in a cross-sectional view.

[0133] The surface of the first insulating member 140D that comes into contact with the first conductive member 10 has a concave curved shape that follows the circumferential surface of the first conductive member 10, and is fused to the first conductive member 10. The surface of the first insulating member 140D that comes into contact with the second conductive member 20 has a convex curved shape that follows the inner circumferential surface of the second conductive member 20, and is not fused to the second conductive member 20. In other words, the first insulating member 140D is capable of moving relative to the second conductive member 20.

[0134] One surface 141D of a pair of surfaces of first insulating member 140D between first conductive member 10 and second conductive member 20 has a convexly curved shape, and the other surface 142D of the pair of surfaces has a concavely curved shape.

[0135] In this embodiment, the first insulating member 140D is described as having a curved shape that is convex in the counterclockwise rotation direction in FIG. 5(b) as an example, but the first insulating member 140D may also have a curved shape that is convex in the clockwise rotation direction.

[0136] In this embodiment, the first insulating member 140D extends in a spiral shape, but may extend in a straight line. The number of the first insulating members 140D may be three or more.

[0137] 12(a) is a cross-sectional view illustrating the configuration of a pressure-sensitive sensor 100E. The pressure-sensitive sensor 100E differs from the pressure-sensitive sensor 100 in the shape of a first insulating member 140E. The components other than the first insulating member 140E have the same shapes as the pressure-sensitive sensor 100.

[0138] The three first insulating members 140E are cylindrical members. The first insulating members 140E are arranged in a spiral shape along the circumferential surface of the first conductive member 10. In a cross-sectional view, the first insulating member 140E has an outer circumferential surface 141E and an inner circumferential surface 142E. The outer circumferential surface 141E is in contact with the first conductive member 10 and the second conductive member 20.

[0139] A portion of outer circumferential surface 141E of first insulating member 140E that contacts first conductive member 10 is fused to first conductive member 10. A portion of outer circumferential surface 141E of first insulating member 140E that contacts second conductive member 20 is not fused to second conductive member 20. In other words, first insulating member 140E is capable of moving relative to second conductive member 20.

[0140] In this embodiment, the first insulating member 140E extends in a spiral shape, but may extend in a straight line. The number of the first insulating members 140E may be three or more.

[0141] 12(b) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 100F. The pressure-sensitive sensor 100F is different from the pressure-sensitive sensor 100 in the shapes of the first conductive member 110F and the first insulating member 140F. The components other than the first conductive member 110F and the first insulating member 140F have the same shapes as the pressure-sensitive sensor 100.

[0142] The first conductive member 110F is a member formed in a substantially cylindrical shape. Three concave grooves 112F in which the first insulating members 140F are disposed are formed on the peripheral surface of the first conductive member 110F. The grooves 112F are formed to extend in a spiral shape in the longitudinal direction of the first conductive member 110F.

[0143] The first insulating member 140F is a member formed in a cylindrical shape. The first insulating member 140F is arranged in a spiral shape along the groove 112F of the first conductive member 110F. In a cross-sectional view, the diameter of the first insulating member 140F is larger than the radial distance from the first conductive member 110F to the second conductive member 20.

[0144] The first insulating member 140F is fused to the first conductive member 110F at the groove 112F. A portion of the first insulating member 140F that contacts the inner circumferential surface of the second conductive member 20 is not fused to the second conductive member 20. In other words, the first insulating member 140F is capable of moving relative to the second conductive member 20.

[0145] In this embodiment, the first insulating member 140F and the groove 112F extend in a spiral shape, but they may extend in a straight line. The number of the first insulating member 140F and the groove 112F may be three or more.

[0146] 7(a) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 100G. The pressure-sensitive sensor 100G differs from the pressure-sensitive sensor 100 in the shape of the first insulating member 140G. The components other than the first insulating member 140G have the same shapes as the pressure-sensitive sensor 100.

[0147] The three first insulating members 140G are members formed in a substantially cylindrical shape. In a cross-sectional view, the diameter of the first insulating member 140G is larger than the radial distance from the first conductive member 10 to the second conductive member 20. The first insulating member 140G is arranged in a spiral shape along the circumferential surface of the first conductive member 10.

[0148] A concave groove 141G in which the first conductive member 10 is disposed is formed on the circumferential surface of the first insulating member 140G. The first insulating member 140G is fused to the first conductive member 10 at the groove 141G. A portion of the first insulating member 140G that contacts the inner circumferential surface of the second conductive member 20 is not fused to the second conductive member 20. In other words, the first insulating member 140G is capable of moving relative to the second conductive member 20.

[0149] In this embodiment, the first insulating member 140G extends in a spiral shape, but the first insulating member 140G may extend in a straight line. The number of the first insulating members 140G may be three or more.

[0150] 13(b) is a cross-sectional view illustrating the configuration of the pressure-sensitive sensor 100H. The pressure-sensitive sensor 100H differs from the pressure-sensitive sensor 100 in the shapes of the first conductive member 110H, the first insulating member 140H, and the second insulating member 150H. The components other than the first insulating member 140H have the same shapes as the pressure-sensitive sensor 100.

[0151] The first conductive member 110H is a member formed in a substantially cylindrical shape. A concave groove 112H in which the first insulating member 140H is disposed is formed on the peripheral surface of the first conductive member 110H. The groove 112H is formed to extend in a spiral shape in the longitudinal direction of the first conductive member 110H.

[0152] The first insulating member 140H is a member formed in a cylindrical shape. The first insulating member 140H is arranged in a spiral shape along the groove 112H of the first conductive member 110H. In a cross-sectional view, the first insulating member 140H has an outer peripheral surface 141H and an inner peripheral surface 142H. The diameter of the first insulating member 140H is larger than the radial distance from the first conductive member 110H to the second conductive member 20.

[0153] The first insulating member 140H is fused to the first conductive member 110H in the groove 112H. A portion of the first insulating member 140H that contacts the inner circumferential surface of the second conductive member 20 is not fused to the second conductive member 20. In other words, the first insulating member 110H is capable of moving relative to the second conductive member 20.

[0154] The second insulating member 150H is a member that covers the outer peripheral surface of the second conductive member 20, and is a member that constitutes the outer shape of the pressure-sensitive sensor 100H. The second insulating member 150H has an outer shape that is D-shaped in cross section.

[0155] Specifically, the second insulating member 150H has a curved surface 151H extending along the second conductive member 20, a pair of side surfaces 152H, 152H having a planar shape extending from both ends of the curved surface 151H, and an end surface 153H having a planar shape arranged between the pair of side surfaces 152H, 152H.

[0156] In this embodiment, the first insulating member 140H and the groove 112H extend in a spiral shape, but they may extend in a straight line. The number of the first insulating member 140H and the groove 112H may be three or more.

[0157] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the pressure sensor has been described as being applied to detect a pressing force based on the conductivity between the first conductive member and the second conductive member, but it may also be configured to detect a pressing force based on a change in the electrostatic capacitance between the first conductive member and the second conductive member.

[0158] Furthermore, the present invention is not limited to the above-described embodiments, but may be applied to an embodiment in which these embodiments are appropriately combined, and is not particularly limited. [Explanation of symbols]

[0159] 1, 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1J, 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H...pressure sensor; 10, 10F, 10H, 10J, 110F, 110H...first conductive member; 20, 20B, 120B...second conductive member; 40, 40A, 40B, 40C, 40D, 40E, 40F, 40G, 40H, 40J, 140, 140A, 140B, 140C, 140D, 140E, 140F, 140G, 140H...first insulating member; L...on a virtual straight line

Claims

1. A first conductive member that is formed in an elongated shape and has electrical conductivity and elasticity; a second conductive member having an elongated space therein in which the first conductive member is disposed, the second conductive member having electrical conductivity and elasticity; an insulating member having insulating properties and elasticity, the insulating member holding the first conductive member at a distance from the second conductive member; Equipped with The insulating member is not fused to the first conductive member, thereby allowing relative movement with respect to the first conductive member, and is fused to the second conductive member.

2. A first conductive member that is formed in an elongated shape and has electrical conductivity and elasticity; a second conductive member having an elongated space therein in which the first conductive member is disposed, the second conductive member having electrical conductivity and elasticity; an insulating member having insulating properties and elasticity, the insulating member holding the first conductive member at a distance from the second conductive member; Equipped with The insulating member is not fused to the first conductive member and is therefore movable relative to the first conductive member, and has a hollow cylindrical shape.

3. The insulating member is formed in an elongated shape, 3. The pressure-sensitive sensor according to claim 1, wherein one of the insulating members is arranged in a spiral shape along the surface of the first conductive member.

4. The insulating member is formed in an elongated shape, 3. The pressure-sensitive sensor according to claim 1, wherein a plurality of said insulating members are disposed at intervals on the surface of said first conductive member.

5. In a cross-sectional view intersecting a longitudinal direction of the first conductive member, 5. The pressure-sensitive sensor according to claim 4, wherein one of said insulating members is disposed on an imaginary line passing through a center of said first conductive member.

6. a first conductive member formed in an elongated shape and having electrical conductivity and elasticity; a second conductive member having an elongated space therein in which the first conductive member is disposed, the second conductive member having electrical conductivity and elasticity; an insulating member having insulating properties and elasticity, the insulating member holding the first conductive member at a distance from the second conductive member; Equipped with The insulating member is non-fused to both the first conductive member and the second conductive member, thereby allowing it to move relative to both the first conductive member and the second conductive member, and has a hollow cylindrical shape.

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