JP2008039449A

JP2008039449A - Displacement detection apparatus

Info

Publication number: JP2008039449A
Application number: JP2006210606A
Authority: JP
Inventors: Masahiro Takiguchi; 昌宏滝口; Yukio Abe; 幸夫阿部; Hiroyuki Ogino; 弘之荻野; Yasuhiro Kawamoto; 恭宏河本
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2006-08-02
Filing date: 2006-08-02
Publication date: 2008-02-21

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement detection apparatus using a cable type sensor needless of such a polarization process as for a piezo cable. <P>SOLUTION: A pair of electric conductive members 5a and 5b are disposed through an electric insulator layer 6 to constitute a cable 1. With applying a displacement such as bending, pressure, vibration and impact on the cable 1, a voltage generates and returns to the original ones again. With removing the displacement such as bending, pressure, vibration and impact, a reverse potential generates and returns to the original ones again. Based on these potentials, the displacement is detected to output the ON/OFF signals. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、物体にかかる圧力や振動等を、物体に装着したケーブル状のセンサに加わる変位として検出する変位検出装置に関するものである。 The present invention relates to a displacement detection device that detects pressure, vibration, and the like applied to an object as displacement applied to a cable-shaped sensor attached to the object.

従来の変位検出装置としては、一対の導電性部材を圧電体を介してケーブル状にし、ケーブルが変位した時に圧電体のピエゾ効果により発生した電位を検出するピエゾケーブルを用いた変位検出装置があった。そして、検出した電位に基づいて制御を行ったり、所定の閾値に基づきＯＮまたはＯＦＦの信号を出力していた（例えば特許文献１参照）。
特開２００１−１１５７３８号公報 As a conventional displacement detection device, there is a displacement detection device using a piezoelectric cable that detects a potential generated by a piezoelectric effect of a piezoelectric body when a pair of conductive members is formed into a cable shape through a piezoelectric body and the cable is displaced. It was. Then, control is performed based on the detected potential, and an ON or OFF signal is output based on a predetermined threshold (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2001-115738

しかしながら前記従来の構成では、圧電体が変位によりピエゾ効果を発生する状態にするためには、圧電体を分極させる必要がある。これには圧電体に対して高電圧を印加するという大掛かりな製造工程が必要になると言う課題があった。 However, in the above-described conventional configuration, it is necessary to polarize the piezoelectric body in order to make the piezoelectric body generate a piezo effect due to displacement. This has a problem that a large manufacturing process of applying a high voltage to the piezoelectric body is required.

本発明は、前記従来の課題を解決するものであり、ピエゾケーブルのような分極工程を必要としないケーブル状のセンサを用いた変位検出装置を提供することを目的とするものである。 The present invention solves the above-described conventional problems, and an object of the present invention is to provide a displacement detection device using a cable-like sensor that does not require a polarization step like a piezo cable.

前記従来の課題を解決するために本発明の変位検出装置は、一対の導電性部材を電気絶縁層を介して配したケーブルと、ケーブルが変位した時に発生する摩擦電位による電位を検出する摩擦電位検出器とを備え、摩擦電位検出器が検出した電位の大きさに応じてＯＮまたはＯＦＦの信号を出力するようにしたものである。 In order to solve the above-described conventional problems, a displacement detection device of the present invention includes a cable in which a pair of conductive members are arranged via an electrical insulating layer, and a friction potential that detects a potential due to a friction potential generated when the cable is displaced. And a detector that outputs an ON or OFF signal according to the magnitude of the potential detected by the friction potential detector.

したがって、ケーブルが本来有する摩擦電位の電位を摩擦電位検出器で検出することにより変位を検出することができる。 Therefore, the displacement can be detected by detecting the potential of the frictional potential inherent in the cable with the frictional potential detector.

本発明の変位検出装置によれば、安価にケーブル状の変位検出装置を得ることができる。 According to the displacement detection device of the present invention, a cable-like displacement detection device can be obtained at low cost.

第１の発明は、一対の導電性部材を電気絶縁層を介して配したケーブルと、ケーブルが変位した時に発生する摩擦電位による電位を検出する摩擦電位検出器とを備え、摩擦電位検出器が検出した電位の大きさに応じた信号を出力するようにしたものである。そして、簡素な構成でかつ、複雑な製造工程を必要とせずにケーブル状の変位検出装置を得ることができる。 A first invention includes a cable in which a pair of conductive members are arranged via an electrical insulating layer, and a friction potential detector that detects a potential due to a friction potential generated when the cable is displaced. A signal corresponding to the magnitude of the detected potential is output. And a cable-shaped displacement detection apparatus can be obtained with a simple structure and without requiring a complicated manufacturing process.

第２の発明は、第1の発明のケーブルを、芯線となる導電性部材とシールドとなる導電性部材との間に電気絶縁層を配した同軸ケーブルとしたものである。そして、外来ノイズに対して強くなるとともに、簡素な構成でかつ、複雑な製造工程を必要とせずにケーブル状の変位検出装置を得ることができる。 In the second invention, the cable of the first invention is a coaxial cable in which an electrically insulating layer is disposed between a conductive member serving as a core wire and a conductive member serving as a shield. And while becoming strong with respect to an external noise, a cable-shaped displacement detection apparatus can be obtained with a simple structure and without requiring a complicated manufacturing process.

第3の発明は、第1または第2の発明の変位検出装置において、所定の閾値を有する判定
回路を持ち、摩擦電位検出器が検出した電位が、閾値より正側に大きい時にはＯＮの信号を出力し、閾値より負側に大きい時にはＯＦＦの信号を出力するようにしたものである。そして、検出した電位を閾値により判定し、制御を行うことができる。 A third invention has a determination circuit having a predetermined threshold value in the displacement detection device of the first or second invention, and outputs an ON signal when the potential detected by the friction potential detector is larger than the threshold value on the positive side. When the output is larger than the threshold value on the negative side, an OFF signal is output. Then, the detected potential can be determined based on the threshold value, and control can be performed.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、本実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

（実施の形態１）
図１において、ケーブル１の一対の導電性部材２a、２ｂは摩擦電位検出器３に繋がれており、変位検出装置４を構成している。 (Embodiment 1)
In FIG. 1, a pair of conductive members 2 a and 2 b of a cable 1 are connected to a friction potential detector 3 and constitute a displacement detection device 4.

図２はケーブル１の構造を示すものであり、一対の導電性部材の一例として、芯線５ａとシールド５ｂが電気絶縁層６を介して配されている。この場合のシールドは細い導電性部材を編組したものである。そして、これらが絶縁被覆７で覆われている。 FIG. 2 shows the structure of the cable 1. As an example of a pair of conductive members, a core wire 5 a and a shield 5 b are arranged via an electrical insulating layer 6. The shield in this case is a braided thin conductive member. These are covered with an insulating coating 7.

次に動作、作用について説明する。図３に示すように、一対の導電性部材５ａ、５ｂの間に生じる電位を摩擦電位検出器３にて検出するために接続し、ケーブル１を屈曲させると、トリボ効果（トライボ効果）による電位が生じ、図４のａの範囲に示すような信号となる。つまり、屈曲させた時に電位（摩擦電位）が生じ、再び元の電位に戻る。 Next, the operation and action will be described. As shown in FIG. 3, when the potential generated between the pair of conductive members 5a and 5b is detected by the friction potential detector 3 and the cable 1 is bent, the potential due to the tribo effect (tribo effect). And a signal as shown in the range of FIG. That is, when bent, a potential (friction potential) is generated and returns to the original potential again.

一方、屈曲状態から元の状態に戻す（屈曲を解放する）と図４のｂの範囲に示すような信号となる。つまり屈曲から解放させた時に逆の電位が生じ、再び元の電位に戻る。 On the other hand, when the bent state is returned to the original state (the bending is released), a signal as shown in the range of b in FIG. 4 is obtained. In other words, when released from bending, a reverse potential is generated and returns to the original potential again.

上記はケーブル１を屈曲させた場合について述べたが、屈曲以外の例えば圧力や振動、衝撃の付加と言ったケーブル１に対する変位によっても同様の摩擦電位が検出される。この様子を図５に示す。屈曲の場合と同様に、圧力等が付加された時に電位が発生し再び戻り、前記圧力等が除去された時に逆の電位が発生し再び戻る。これにより変位が検出でき、それに伴う信号、例えば電位の変動に比例した信号やＯＮ／ＯＦＦ信号を出力することができる。 Although the above has described the case where the cable 1 is bent, a similar frictional potential is also detected by a displacement with respect to the cable 1 such as application of pressure, vibration or impact other than bending. This is shown in FIG. As in the case of bending, a potential is generated and returned again when pressure or the like is applied, and a reverse potential is generated and returned again when the pressure or the like is removed. Thus, the displacement can be detected, and a signal associated therewith, for example, a signal proportional to a change in potential or an ON / OFF signal can be output.

また、図１の判定回路８を設け、図5に示すような閾値を設定し、その閾値を正側に超えるものについてＯＮ、負側に超えるものについてＯＦＦ信号を出すこともできる。 Further, the determination circuit 8 of FIG. 1 can be provided, and a threshold value as shown in FIG. 5 can be set, and an ON signal can be output for those exceeding the threshold value on the positive side and an OFF signal for those exceeding the negative side.

これらによりピエゾケーブルのような分極工程を必要としないケーブル状のセンサを用いた変位検出装置となる。 As a result, a displacement detection device using a cable-like sensor that does not require a polarization step like a piezo cable is provided.

以上のように本発明にかかる変位検出装置は、簡素な構成でかつ、複雑な製造工程を必要とせずにケーブル状の変位検出装置を得ることができるため、安価な変位検出装置として有用である。 As described above, the displacement detection device according to the present invention is useful as an inexpensive displacement detection device because a cable-like displacement detection device can be obtained with a simple configuration and without requiring a complicated manufacturing process. .

本発明の第１の実施の形態における変位検出装置の構成図The block diagram of the displacement detection apparatus in the 1st Embodiment of this invention 同実施の形態における変位検出装置のケーブルの構成図Configuration diagram of cable of displacement detection device in same embodiment 同実施の形態における変位検出装置の動作を示す説明図Explanatory drawing which shows operation | movement of the displacement detection apparatus in the embodiment 同実施の形態における変位検出装置の出力電位を示すグラフThe graph which shows the output potential of the displacement detection apparatus in the same embodiment 同実施の形態における変位検出装置の出力電位を示すグラフThe graph which shows the output potential of the displacement detection apparatus in the same embodiment

Explanation of symbols

１ケーブル
２ａ、２ｂ、５ａ、５ｂ導電性部材
３摩擦電位検出器
４変位検出装置
６電気絶縁層
８判定回路 DESCRIPTION OF SYMBOLS 1 Cable 2a, 2b, 5a, 5b Conductive member 3 Friction potential detector 4 Displacement detection apparatus 6 Electrical insulation layer 8 Judgment circuit

Claims

A cable in which a pair of conductive members are arranged via an electrical insulation layer; and a friction potential detector that detects a potential due to a friction potential generated when the cable is displaced, the potential detected by the friction potential detector A displacement detector that outputs a signal according to the size.

The displacement detection device according to claim 1, wherein the cable is a coaxial cable in which an electrically insulating layer is disposed between a conductive member serving as a core wire and a conductive member serving as a shield.

A determination circuit having a predetermined threshold value, wherein an ON signal is output when the potential detected by the friction potential detector is larger than the threshold value on the positive side, and an OFF signal is output when the potential value is larger than the threshold value on the negative side. Item 3. The displacement detection device according to Item 1 or 2.