JPS6352024A - Pressure sensor - Google Patents

Abstract

PURPOSE:To enable one sensor to detect an external force in many directions by arranging a pressure conductive member between an inside and an outside conductor concentrically. CONSTITUTION:One conductor 13 is arranged in the center, the other conductor 14 is formed annularly, and the pressure conductive member 12 is interposed concentrically between those conductors 13 and 14. Further, the outer periphery of the conductor 14 is covered with a coating member 15 made of silicone rubber. Then a constant voltage is applied to the conductors 13 and 14 all the time, but the conductors 14 and 14 are not conductive so that the member 12 which is interposed has a high resistance value. Here, when an external force is applied to the member 15, the member 12 is compressed and stressed and metal particulates dispersed in the silicone rubber come close to one another and become easy to contact. Consequently, the resistance value decreases abruptly and the two conductors 14 and 14 become conductive to each other to function as a sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure-sensitive sensor, and more particularly to a pressure-sensitive sensor constructed using a pressurized conductive member whose electrical resistance changes with pressurization.

(Prior Art) As a conventional FL pressure-sensitive sensor, there is known a sensor as shown in FIG. 2 in which a pressurized conductive member is sandwiched between parallel conductors.

Here, 1 is a pressure-sensitive sensor, 2 is its pressurized conductive raw material, and the pressurized conductive member 2 is made by dispersing metal fine particles in silicone rubber, which has excellent characteristics even when raw. It was formed. Reference numerals 3 and 4 are conductors that are parallel to each other and have a pressurized conductive member 2 interposed between them.
Outside; 7! A covering member 5 made of silicone rubber is provided on I+ to also serve as a protection 35 for all of these.

In the three-pressure sensor 1 configured in this way, when pressure is applied from the direction of the arrow, for example, the pressurized conductive member 2 is distorted, and the internal metal particles come close to each other, resulting in a sudden increase in resistance. As a result, an energized state is obtained between the conductors 3 and 4, and the pressurizing force can be detected by extracting the change in resistance.

However, in such a conventional pressure-sensitive sensor 1, since the pressurized conductive member 2 and the conductors 3 and 4 are provided parallel to each other, response sensitivity can be obtained with respect to stress in the stacking direction. is perpendicular to the stacking direction,
That is, it did not respond at all to stress in a direction parallel to conductors 3 and 4.

That is, since the above-described conventional pressure sensor 1 has sensitivity in only one direction, the direction in which the pressure sensor 1 can be mounted is limited, making it extremely inconvenient to use.

(Problems to be Solved by the Invention) The purpose of the present invention is to eliminate the drawbacks of the conventional example described above, to make it possible to detect external forces from multiple directions with one sensor, and to provide an easy-to-use and versatile sensor. An object of the present invention is to provide a pressure sensor.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a pressure-sensitive device in which a pressurized conductive member whose electrical resistance value changes depending on the applied pressure is interposed between two conductors. In a sensor, one of the conductors has a circular cross section and is arranged at the center, and the pressurized conductive member and the other conductor are arranged concentrically around the outer periphery of one of the conductors. Features.

(Function) In the pressure-sensitive sensor of the present invention, by arranging the pressurized conductive member concentrically between the inner and outer conductors, the pressurized conductive member will not be affected by external pressure from any direction. By distorting accordingly, current is passed between the conductors, and the sensitivity corresponding to the applied force can be detected.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment of the invention. 11 is a pressure-sensitive sensor of this example. In the pressure sensor 11, 12 is a pressurized conductive member formed by uniformly dispersing and embedding metal particles in silicone rubber, 13 and 14 are conductors, and in this example, one conductor 13 is located in the center. are arranged in a circular shape, and further the other conductor 14 is formed in an annular shape, and a pressurized conductive member 12 is interposed in a circular manner between these conductors 13 and 14, Further, the outer periphery of the conductor 14 is covered with a covering member 15 made of silicone rubber.

In the above configuration, a constant voltage is always applied to the conductors 13 and 14, but since the pressurized conductive member 12 interposed therebetween has a high resistance value, current cannot be passed between the conductors 13 and 14. This is to make sure you don't get caught. However, when an external force is applied to the covering member 15 of the pressure-sensitive sensor 11, compressive stress is generated in the pressurized conductive member 12, and as described above, the metal fine particles dispersed in the silicone rubber come close to each other. When the two i4 bodies 13 and 14 are brought into contact with each other, the resistance value suddenly decreases, and current is applied between the two i4 bodies 13 and 14, thereby functioning as a pressure-sensitive sensor.

In addition, in this example, since the pressurized conductive member 12 and the conductor 13 are provided concentrically around the conductor 13, uniform sensitivity can be obtained even when stress is applied from any direction within 360 degrees. becomes possible.

In the above embodiment, the pressure-sensitive conductive member 12 is surrounded by the conductor 14 all around.
Needless to say, it is not necessary to arrange one conductor 14 so as to completely surround the other conductor 14, and it is possible to change the enclosing range according to the angle corresponding to the required sensitivity.

(Effects of the Invention) As described above, according to the present invention, it is possible to provide equivalent detection sensitivity to external forces applied in angular directions over a wide range, preferably 360°.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the structure of a pressure-sensitive sensor of the present invention, and FIG. 2 is a sectional view showing an example of the structure of a conventional pressure-sensitive sensor. 1.11...Pressure sensitive sensor, 2.12...Pressure conductive member, 3.4.13.14...Conductor, 5.15...Coating member. Figure 1 Figure 2

Claims (1)

[Claims] 2 Pressurized conductive members whose electrical resistance value changes depending on the applied pressure.
In a pressure-sensitive sensor interposed between two conductors, one of the conductors has a circular cross section and is arranged at the center, and the pressure conductive member and the other conductor are connected to the pressure-sensitive conductor. A pressure-sensitive sensor characterized by being arranged concentrically around the outer periphery of one conductor.