JP3077751U - Flexible linear sensor - Google Patents

Abstract

(57) [PROBLEMS] To detect a change in capacitance between electrodes when an object to be detected is close to a flexible linear body and can be bent in a complicated manner in two or three axis directions. A flexible linear sensor is provided. SOLUTION: This is a flexible linear sensor 1 connected to a capacitance detector 5, comprising a flexible linear body 4 in which an electrode composed of a pair of conductive core wires 2 is surrounded by an insulating material 3. A change in the capacitance between the electrodes when the detection object approaches or comes into contact with the flexible linear body 4 is sensed.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a flexible linear sensor, and more specifically to a sensor for detecting a change in capacitance between electrodes when an object to be detected approaches a flexible linear body. The present invention relates to a flexible linear sensor used as an exit monitoring sensor, a theft detection sensor installed under a safe, a sensor for detecting a pinch of an elevator, and the like.

As shown in Japanese Unexamined Patent Application Publication No. 60-150517, a conventional switch prints a conductive material on a film of polyester or the like and draws out lead wires. There is a type in which the conductive material on the film is brought into contact with the film by pressing it from above and below to turn on the switch. Further, a switch in which an insulating spacer having a predetermined thickness is interposed between polyester films on which the conductive material is printed has been proposed. Further, there is a sheet-like switch in which an upper and lower electrode plate is interposed between a pair of flexible resin films, and an insulating spacer is arranged between the above-mentioned electrode plates to provide a space between the upper and lower electrode plates. .

[0003]

[Problems to be solved by the invention]

 However, when the conductive material is printed on a resin film, the switch such as polyester is turned on and off by bending the film such as polyester. Had a problem that it was damaged by overload. This switch also suffers from the problem that, when a heavy load far exceeding the operating load is applied, the polyester film is plastically deformed, the electrodes come into close contact with each other and the restorability is lost, and the conductive paint is damaged by the compressive force. Was.

Further, in a conventional electrode, when a line electrode where an upper electrode and a lower electrode cross each other receives a load, the line electrode contacts and conducts electricity. However, when a large area is sensed, an insulating material is provided between the upper electrode and the lower electrode. In some cases, the force may act directly on the insulating material depending on the direction of the force received by the switch, and at this time, the switch may not operate. Further, when the above-mentioned switch is bent in a complicated manner in two or three axes, there is a problem that the electrodes come into contact with each other and the function of the switch is impaired.

The present invention solves such a problem of the conventional switch. The switch can be bent in a complicated manner in two or three axes, and the object to be detected is close to the flexible linear body. It is an object of the present invention to provide a flexible linear sensor that detects a change in capacitance between electrodes when they are in contact with each other.

[0006]

[Means for Solving the Problems]

 According to a first aspect of the present invention, there is provided a flexible linear sensor connected to a capacitance detector, wherein a flexible wire having a pair of conductive core wires surrounded by an insulating material. It detects a change in capacitance between electrodes when a detection object approaches or comes into contact with the flexible linear object. The above sensor can be installed by bending it in two or three directions even in an installation place such as a corner, and can detect proximity or contact of the object from all directions by changing the capacitance. it can.

[0007]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall view of a flexible linear sensor according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. According to this, the flexible linear sensor 1 according to the present invention has a pair of conductive core wires 2 and 2 made of phosphor bronze, copper, or the like, which are arranged in parallel at an interval, and the periphery thereof is non-conductive. Flexible insulation made of natural rubber, styrene butadiene rubber, butyl rubber, chloroprene rubber, hydrogenated nitrile rubber, rubber foam such as EPDM, and foam of thermoplastic resin such as urethane foam, polyethylene, PET, and vinyl chloride The flexible linear body 4 is surrounded by the material 3. Then, the pair of conductive core wires 2 and 2 are connected to a capacitance detector 5 for detecting a change in capacitance, and when the object comes close to or comes into contact with the flexible linear sensor 1 on which the detection target is arranged. The change in the capacitance can be sensed at the same time.

[0008] Specifically, a pair of conductive core wires 2 and 2 made of a two-core cable electric wire are covered with a vinyl chloride insulating material 3 to form a flexible linear body. It is connected to the capacitance detector 5 so that when an object to be detected, such as a human or an animal, directly touches or approaches the flexible linear body, the capacitance changes and a detection signal is output. It is.

The thickness of the conductive core wires 2 is not particularly limited, but the thickness of the insulating material 3 is preferably 0.1 to 20 mm, and may be any range as long as the flexibility is maintained. The flexible linear sensor 1 can be installed by being bent in two or three axial directions, and can also be attached to a corner portion, so that the proximity or contact of the object from all directions can be reduced. It can be detected in combination with the capacitance detector 5.

When the capacitance detector 5 attempts to detect the proximity or contact of the object to be detected, for example, it is determined that the capacitance between the pair of conductive core wires 2 has become equal to or greater than a certain value. A detection circuit for detecting and discriminating and displaying is provided, and a predetermined voltage is applied between the pair of conductive core wires 2. Assuming that the capacitance generated by the detection target is C2 and the capacitance of the flexible linear sensor 1 is C1, the capacitance C2 is obtained when the detection target approaches the flexible linear sensor 1 side. Changes, the capacitance (C1 + C2) also changes, and the proximity of the object is detected as the amount of change in the output voltage.

[0011]

[Effect of the invention]

 As described above, in the present application, the flexible linear proximity sensor connected to the capacitance detector includes a flexible linear body in which electrodes composed of a pair of conductive core wires are surrounded by an insulating material. It senses the change in capacitance between the electrodes when the sensing object approaches or comes into contact with the flexible linear body. Even if the installation location is biaxial or triaxial, it is installed by bending. And the proximity or contact of the object from any direction can be detected by a change in capacitance.

[Brief description of the drawings]

FIG. 1 is an overall view of a flexible linear proximity sensor according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible linear proximity sensor 2 Conductive core wire 3 Insulating material 4 Flexible linear body 5 Capacitance detector

Claims (1)

[Utility model registration claims] 1. A flexible linear contact sensor connected to a capacitance detector, the flexible linear contact sensor comprising a flexible linear body having a pair of conductive core wires surrounded by an insulating material. A flexible linear sensor which detects a change in capacitance between electrodes when a detection object approaches or comes into contact with a linear body.