JP2007078629A - Impact detecting sensor - Google Patents

Impact detecting sensor Download PDF

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Publication number
JP2007078629A
JP2007078629A JP2005270184A JP2005270184A JP2007078629A JP 2007078629 A JP2007078629 A JP 2007078629A JP 2005270184 A JP2005270184 A JP 2005270184A JP 2005270184 A JP2005270184 A JP 2005270184A JP 2007078629 A JP2007078629 A JP 2007078629A
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Japan
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optical fiber
mold member
detection sensor
collision detection
collision
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JP2005270184A
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Japanese (ja)
Inventor
Yoji Kobayashi
陽二 小林
哲哉 ▲高▼藤
Tetsuya Takato
Koichi Fujita
浩一 藤田
Ryutaro Ienaka
竜太郎 家中
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Hitachi Cable Ltd
Denso Corp
Toyota Motor Corp
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Hitachi Cable Ltd
Denso Corp
Toyota Motor Corp
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Priority to JP2005270184A priority Critical patent/JP2007078629A/en
Publication of JP2007078629A publication Critical patent/JP2007078629A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an impact detecting sensor of high sensitivity, as to the impact detecting sensor for detecting a stress due to an impact by converting the stress into a change of a light transmission characteristic of an optical fiber. <P>SOLUTION: In this impact detecting sensor with an outer circumference of a stress concentration plate 1 and the optical fiber 2 formed along the stress concentration plate 1 molded by a molding member 3, an area of a top part 3a of the molding member 3 receiving a load of the impact is made narrower than an area of a cross section 3c in parallel to the top part 3a in a barrel part 3b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、衝突による応力を光ファイバの光伝送特性の変化に変換して検知する衝突検知センサに係り、感度が高い衝突検知センサに関する。   The present invention relates to a collision detection sensor that detects a stress by converting a stress caused by a collision into a change in optical transmission characteristics of an optical fiber, and relates to a collision detection sensor having high sensitivity.

車体の周囲、例えばバンパーに衝突物（例えば歩行者）との衝突を検知する衝突検知センサを設置することにより、対歩行者の安全性を高めることが検討されている。   It has been studied to improve the safety of pedestrians by installing a collision detection sensor for detecting a collision with a collision object (for example, a pedestrian) around the vehicle body, for example, a bumper.

一方、衝突検知センサとして、衝突による応力を光ファイバの光伝送特性の変化に変換することにより、衝突を検知する衝突検知光ファイバセンサがある。例えば、図３（ａ）に示した衝突検知センサは、部分的に空隙３６を持った金属製の応力集中板３１にプラスチック製の光ファイバ３２を積層し、これら応力集中板３１と光ファイバ３２の外周を硬度の低いモールド部材３３でモールドしたものである。これによると、衝突による力（図では荷重伝達板３４を介して与えている）が光ファイバ３２を応力集中板３１に押しつけるため、空隙３６の両縁において光ファイバ３２に曲げが生じる。これにより、衝突に起因する伝送損失の増加を生じさせることができる。   On the other hand, as a collision detection sensor, there is a collision detection optical fiber sensor that detects a collision by converting a stress caused by the collision into a change in optical transmission characteristics of the optical fiber. For example, in the collision detection sensor shown in FIG. 3A, a plastic optical fiber 32 is laminated on a metal stress concentrating plate 31 having a gap 36 partially, and the stress concentrating plate 31 and the optical fiber 32 are laminated. Is molded with a molding member 33 having a low hardness. According to this, since the force due to the collision (applied through the load transmission plate 34 in the drawing) presses the optical fiber 32 against the stress concentration plate 31, the optical fiber 32 is bent at both edges of the gap 36. As a result, an increase in transmission loss due to the collision can be caused.

特表２００２−５３１８１２号公報JP-T-2002-531812

図３（ａ）に示した従来の衝突検知センサは、上部より衝突による部分荷重（力）を受けた場合、図３（ｂ）のように硬度の低いモールド部材３３が圧縮変形し、その歪みが光ファイバ３２の変形を誘発し、光ファイバ３２を伝搬する光量が変化することにより、衝突を検知する。   In the conventional collision detection sensor shown in FIG. 3A, when a partial load (force) due to a collision is received from above, the mold member 33 having low hardness is compressed and deformed as shown in FIG. Induces deformation of the optical fiber 32, and the amount of light propagating through the optical fiber 32 changes to detect a collision.

図４（ａ）は、図３（ａ）とは直角な断面で従来の衝突検知センサを示したものである。符号の同じものは同じ部材を表している。   FIG. 4 (a) shows a conventional collision detection sensor with a cross section perpendicular to FIG. 3 (a). The same reference numerals represent the same members.

図示のように、モールド部材３３の断面形状は長方形である。このため、荷重伝達板３４に接して衝突の荷重を受ける頂部の面積、すなわち受圧面積が広い。よって、この衝突検知センサは、荷重が小さい場合に、モールド部材の変形が小さく、光ファイバの変形が小さいため、感度が低い。   As illustrated, the cross-sectional shape of the mold member 33 is a rectangle. For this reason, the area of the top part which contacts the load transmission board 34 and receives the load of a collision, ie, a pressure receiving area, is wide. Therefore, this collision detection sensor has low sensitivity because the deformation of the mold member is small and the deformation of the optical fiber is small when the load is small.

すなわち、図４（ｂ）のように上から力が加わると、モールド部材３３は上下に圧縮されるため、胴部３３ｂが膨らんで断面形状が長円形になる。光ファイバ３２は応力集中板３１の空隙３６に撓み込んでいくが、その撓み量は少ない。その結果として、感度が低くなり、不感帯荷重が高くなる。   That is, when a force is applied from above as shown in FIG. 4B, the mold member 33 is compressed up and down, so that the body 33b swells and the cross-sectional shape becomes an oval. The optical fiber 32 is bent into the gap 36 of the stress concentration plate 31, but the amount of bending is small. As a result, the sensitivity decreases and the dead zone load increases.

また、従来の衝突検知センサは、軽量でかつ衝突荷重が互いに近い複数種類の衝突物（例えば、６才以下の子供とポストコーン）の区別が難しい。   In addition, the conventional collision detection sensor is difficult to distinguish between a plurality of types of collision objects (for example, a child under 6 years old and a post cone) that are lightweight and have similar collision loads.

そこで、本発明の目的は、上記課題を解決し、感度が高い衝突検知センサを提供することにある。   Therefore, an object of the present invention is to solve the above-described problems and provide a collision detection sensor with high sensitivity.

上記目的を達成するために第１の発明は、応力集中板と該応力集中板に沿わせた光ファイバとの外周をモールド部材でモールドした衝突検知センサにおいて、衝突の荷重を受ける上記モールド部材の頂部の面積を胴部における頂部と平行な断面の面積より小さくしたものである。   In order to achieve the above object, a first invention is a collision detection sensor in which an outer periphery of a stress concentration plate and an optical fiber along the stress concentration plate is molded with a mold member. The area of the top is smaller than the area of the cross section parallel to the top of the body.

上記モールド部材の頂部に直角な断面の形状が台形を含んでもよい。   The shape of the cross section perpendicular to the top of the mold member may include a trapezoid.

また、第２の発明は、応力集中板と該応力集中板に沿わせた光ファイバとの外周をモールド部材でモールドした衝突検知センサにおいて、上記モールド部材内に空孔を形成したものである。   According to a second aspect of the present invention, there is provided a collision detection sensor in which a periphery of a stress concentration plate and an optical fiber along the stress concentration plate is molded with a mold member, wherein holes are formed in the mold member.

上記空孔は、光ファイバの両側に形成してもよい。   The holes may be formed on both sides of the optical fiber.

本発明は次の如き優れた効果を発揮する。   The present invention exhibits the following excellent effects.

（１）感度が高い衝突検知センサを実現できる。   (1) A highly sensitive collision detection sensor can be realized.

以下、本発明の一実施形態を添付図面に基づいて詳述する。   Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

図１（ａ）に示すように、本発明の第１の実施形態による衝突検知センサは、応力集中板１と該応力集中板１に沿わせた光ファイバ２との外周をモールド部材３でモールドした衝突検知センサにおいて、衝突の荷重を受ける上記モールド部材３の頂部３ａの面積を胴部３ｂにおける頂部３ａと平行な断面３ｃの面積より小さくしたものである。   As shown in FIG. 1A, the collision detection sensor according to the first embodiment of the present invention uses a mold member 3 to mold the outer periphery of a stress concentration plate 1 and an optical fiber 2 along the stress concentration plate 1. In the collision detection sensor, the area of the top 3a of the mold member 3 that receives the load of the collision is made smaller than the area of the cross section 3c parallel to the top 3a of the body 3b.

応力集中板１は、従来と同様に金属製であり、かつ長手方向に適宜な間隔で空隙６を形成したものである。空隙６はモールド部材３が占めている。   The stress concentrating plate 1 is made of metal as in the prior art, and has gaps 6 formed at appropriate intervals in the longitudinal direction. The gap 6 is occupied by the mold member 3.

光ファイバ２は、プラスチック製（ＨＰＯＦ）であり、モールド部材３は、シリコーンゴム製である。   The optical fiber 2 is made of plastic (HPOF), and the mold member 3 is made of silicone rubber.

図示のように、モールド部材３は、頂部３ａに直角な断面の形状が台形を含んでいる。すなわち、応力集中板１を覆っている底辺部３ｄでは、モールド部材３の断面形状は長方形であるが、光ファイバ２を覆っている胴部３ｂのあたりから上はモールド部材３の断面形状が長方形のエッジを切り落としたような台形となっている。これにより、頂部３ａの面積が胴部３ｂにおける断面３ｃの面積より小さくなっている。   As illustrated, the mold member 3 has a trapezoidal cross-sectional shape perpendicular to the top 3a. That is, in the bottom part 3 d covering the stress concentration plate 1, the cross-sectional shape of the mold member 3 is rectangular, but the cross-sectional shape of the mold member 3 is rectangular from around the body part 3 b covering the optical fiber 2. It has a trapezoidal shape with the edges cut off. Thereby, the area of the top part 3a is smaller than the area of the cross section 3c in the trunk | drum 3b.

次に、この衝突検知センサの動作を説明する。   Next, the operation of this collision detection sensor will be described.

図１（ａ）に示すように、モールド部材３の頂部３ａと底辺部３ｄには、それぞれ荷重伝達板４が設けられている。   As shown to Fig.1 (a), the load transmission board 4 is provided in the top part 3a and the base part 3d of the mold member 3, respectively.

ここで、荷重伝達板４を押すことにより、モールド部材３に上から力が加わると、図１（ｂ）に示すように、モールド部材３は上下に圧縮されるため、胴部３ｂが膨らんで断面形状が長円形になる。光ファイバ２は応力集中板１の空隙６に撓み込んでいくが、その撓み量が従来（図４（ｂ）参照）に比べて多い。これは、衝突の荷重を受けるモールド部材３の頂部３ａの面積が胴部３ｂにおける断面３ｃの面積より小さいために、単位面積当たりに大きな荷重が加わることになって、モールド部材３の変形が促進されるからである。   Here, when a force is applied to the mold member 3 from above by pushing the load transmission plate 4, the mold member 3 is compressed up and down as shown in FIG. The cross-sectional shape becomes oval. The optical fiber 2 is bent into the gap 6 of the stress concentrating plate 1, but the amount of bending is larger than that of the conventional case (see FIG. 4B). This is because the area of the top portion 3a of the mold member 3 that receives the impact load is smaller than the area of the cross section 3c in the body portion 3b, so that a large load is applied per unit area, and the deformation of the mold member 3 is promoted. Because it is done.

光ファイバ２の撓み量が従来より多いために、伝送損失の増加をより大きく生じさせることができる。よって、この衝突検知センサは、従来より感度が高くなる。その結果、不感帯荷重を低くすることができる。   Since the amount of bending of the optical fiber 2 is larger than the conventional amount, the transmission loss can be greatly increased. Therefore, this collision detection sensor has higher sensitivity than before. As a result, the dead zone load can be reduced.

次に、図２（ａ）に示すように、本発明の第２の実施形態による衝突検知センサは、応力集中板１と該応力集中板１に沿わせた光ファイバ２との外周をモールド部材３でモールドした衝突検知センサにおいて、上記モールド部材３内に空孔５を形成したものである。   Next, as shown in FIG. 2A, in the collision detection sensor according to the second embodiment of the present invention, the outer periphery of the stress concentration plate 1 and the optical fiber 2 along the stress concentration plate 1 is formed as a mold member. In the collision detection sensor molded at 3, holes 5 are formed in the mold member 3.

応力集中板１は、従来と同様に金属製であり、かつ長手方向に適宜な間隔で空隙６を形成したものである。空隙６はモールド部材３が占めている。   The stress concentrating plate 1 is made of metal as in the prior art, and has gaps 6 formed at appropriate intervals in the longitudinal direction. The gap 6 is occupied by the mold member 3.

光ファイバ２は、プラスチック製（ＨＰＯＦ）であり、モールド部材３は、シリコーンゴム製である。   The optical fiber 2 is made of plastic (HPOF), and the mold member 3 is made of silicone rubber.

空孔５は、光ファイバ２の両側に形成してある。すなわち、この空孔５は、光ファイバ２と平行に伸びた円筒状の空孔５であり、断面が円形となっている。   The holes 5 are formed on both sides of the optical fiber 2. That is, the hole 5 is a cylindrical hole 5 extending in parallel with the optical fiber 2 and has a circular cross section.

次に、この衝突検知センサの動作を説明する。   Next, the operation of this collision detection sensor will be described.

図２（ａ）に示すように、モールド部材３の頂部３ａと底辺部３ｄには、それぞれ荷重伝達板４が設けられている。   As shown in FIG. 2A, load transmitting plates 4 are provided on the top 3a and the bottom 3d of the mold member 3, respectively.

ここで、荷重伝達板４を押すことにより、モールド部材３に上から力が加わると、図２（ｂ）に示すように、モールド部材３は上下に圧縮されるため、胴部３ｂが膨らんで断面形状が長円形になる。光ファイバ２は応力集中板１の空隙６に撓み込んでいくが、その撓み量が従来（図４（ｂ）参照）に比べて多い。これは、モールド部材３内に空孔５が形成されているため、モールド部材３が変形しやすくなっているからである。   Here, when a force is applied to the mold member 3 from above by pushing the load transmitting plate 4, the mold member 3 is compressed up and down as shown in FIG. The cross-sectional shape becomes oval. The optical fiber 2 is bent into the gap 6 of the stress concentrating plate 1, but the amount of bending is larger than that of the conventional case (see FIG. 4B). This is because the holes 5 are formed in the mold member 3 and the mold member 3 is easily deformed.

光ファイバ２の撓み量が従来より多いために、伝送損失の増加をより大きく生じさせることができる。よって、この衝突検知センサは、従来より感度が高くなる。その結果、不感帯荷重を低くすることができる。   Since the amount of bending of the optical fiber 2 is larger than the conventional amount, the transmission loss can be greatly increased. Therefore, this collision detection sensor has higher sensitivity than before. As a result, the dead zone load can be reduced.

本発明の第１の実施形態による衝突検知センサの光ファイバに直角な断面の断面図であり、（ａ）は非衝突時、（ｂ）は衝突時を表す。It is sectional drawing of the cross section orthogonal to the optical fiber of the collision detection sensor by the 1st Embodiment of this invention, (a) represents the time of a collision, (b) represents the time of a collision. 本発明の第２の実施形態による衝突検知センサの光ファイバに直角な断面の断面図であり、（ａ）は非衝突時、（ｂ）は衝突時を表す。It is sectional drawing of the cross section orthogonal to the optical fiber of the collision detection sensor by the 2nd Embodiment of this invention, (a) represents the time of a collision, (b) represents the time of a collision. 従来の衝突検知センサの光ファイバに沿った断面の断面図であり、（ａ）は非衝突時、（ｂ）は衝突時を表す。It is sectional drawing of the cross section along the optical fiber of the conventional collision detection sensor, (a) represents the time of a collision, (b) represents the time of a collision. 従来の衝突検知センサの光ファイバに直角な断面の断面図であり、（ａ）は非衝突時、（ｂ）は衝突時を表す。It is sectional drawing of the cross section orthogonal to the optical fiber of the conventional collision detection sensor, (a) is the time of a non-collision, (b) represents the time of a collision.

符号の説明Explanation of symbols

１ 応力集中板
２ 光ファイバ
３ モールド部材
４ 荷重伝達板
５ 空孔
６ 空隙 DESCRIPTION OF SYMBOLS 1 Stress concentration board 2 Optical fiber 3 Mold member 4 Load transmission board 5 Hole 6 Air gap

Claims (4)

応力集中板と該応力集中板に沿わせた光ファイバとの外周をモールド部材でモールドした衝突検知センサにおいて、衝突の荷重を受ける上記モールド部材の頂部の面積を胴部における頂部と平行な断面の面積より小さくしたことを特徴とする衝突検知センサ。   In a collision detection sensor in which the outer periphery of a stress concentrating plate and an optical fiber along the stress concentrating plate is molded with a mold member, the area of the top of the mold member that receives a collision load is a cross section parallel to the top of the body. Collision detection sensor characterized by being smaller than area. 上記モールド部材の頂部に直角な断面の形状が台形を含むことを特徴とする請求項１記載の衝突検知センサ。   The collision detection sensor according to claim 1, wherein a shape of a cross section perpendicular to the top of the mold member includes a trapezoid. 応力集中板と該応力集中板に沿わせた光ファイバとの外周をモールド部材でモールドした衝突検知センサにおいて、上記モールド部材内に空孔を形成したことを特徴とする衝突検知センサ。   A collision detection sensor in which a periphery of a stress concentration plate and an optical fiber along the stress concentration plate is molded with a mold member, wherein a hole is formed in the mold member. 上記空孔は、光ファイバの両側に形成したことを特徴とする請求項３記載の衝突検知センサ。
4. The collision detection sensor according to claim 3, wherein the holes are formed on both sides of the optical fiber.
JP2005270184A 2005-09-16 2005-09-16 Impact detecting sensor Pending JP2007078629A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100886921B1 (en) * 2007-06-15 2009-03-09 한국건설기술연구원 Loadcell using optical fiber cable sensor and load measurement method using the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60139274U (en) * 1984-02-27 1985-09-14 株式会社信明産業 shock sensor
JPS6442431U (en) * 1987-09-08 1989-03-14
JP2005153675A (en) * 2003-11-25 2005-06-16 Masakatsu Yoshimoto Touch detecting device for vehicle
JP2005241417A (en) * 2004-02-26 2005-09-08 Hitachi Cable Ltd Impact detection optical fiber sensor and system using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60139274U (en) * 1984-02-27 1985-09-14 株式会社信明産業 shock sensor
JPS6442431U (en) * 1987-09-08 1989-03-14
JP2005153675A (en) * 2003-11-25 2005-06-16 Masakatsu Yoshimoto Touch detecting device for vehicle
JP2005241417A (en) * 2004-02-26 2005-09-08 Hitachi Cable Ltd Impact detection optical fiber sensor and system using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100886921B1 (en) * 2007-06-15 2009-03-09 한국건설기술연구원 Loadcell using optical fiber cable sensor and load measurement method using the same

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