JP5548560B2 - Aerial ultrasonic transducer - Google Patents

Aerial ultrasonic transducer Download PDF

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JP5548560B2
JP5548560B2 JP2010200834A JP2010200834A JP5548560B2 JP 5548560 B2 JP5548560 B2 JP 5548560B2 JP 2010200834 A JP2010200834 A JP 2010200834A JP 2010200834 A JP2010200834 A JP 2010200834A JP 5548560 B2 JP5548560 B2 JP 5548560B2
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bottomed cylindrical
cylindrical case
ultrasonic transducer
opening
ultrasonic
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JP2012060358A (en
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義晴 谷口
巧 重森
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Nippon Ceramic Co Ltd
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Nippon Ceramic Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles

Description

本発明は、超音波周波数帯の送信、受信を行う空中用超音波送受波器に関するものである。   The present invention relates to an aerial ultrasonic transducer for transmitting and receiving an ultrasonic frequency band.

従来の実施の形態に関わる超音波送受波器において、これを車のバンパー等に埋め込み設置し、周辺の障害物を検出する場合、超音波送受波器にパルスバースト電気信号を入力することで超音波送受波器からその入力パルスバースト電気信号に応じた超音波信号が発振され、発振された超音波信号は障害物に到達した後、その障害物で反射し、超音波信号の一部は同じ超音波送受波器に戻ってくる。超音波送受波器はその反射信号を受信することで障害物を検出しバックセンサ、コーナーセンサを成している。
従来の実施の形態に関わる超音波送受波器において、図３にその概略縦断面図を表す。図３は従来の実施の形態に関わる超音波送受波器における有底筒状ケースの概略上面図および断面図を表す。図３において、アルミニウム材等から成る内部が長方形状の有底筒状ケース２の底面内部に圧電素子１を接着しユニモルフ振動子を構成する。圧電素子１の有底筒状ケース２との接着面側の反対面から入出力リード５a、有底筒状ケース２から入出力リード５ｂを半田付け等をして取り出す。圧電素子１の有底筒状ケース２との接着面側と有底筒状ケース２とは電気的に接続されており、更に圧電素子１と入出力リード５a及び、有底筒状ケース２と入出力リード５ｂは電気的に接続されている。入出力リード５ａおよび５ｂはＰＶＣ被覆ワイヤ付きコネクタ６のワイヤにそれぞれ半田付けされている。圧電素子１の上面にシリコーン発泡体等から成る吸音材３を設置し、更にその上からシリコーン材、ウレタン材等の弾性体から成る封止剤４を有底筒状ケース２内に充填して構成されている。有底筒状ケース２の側面開口部はすべてシリコーン材、ウレタン材等からなる充填材７を充填しておく必要がある。
従来の実施の形態に関わる超音波送受波器において、有底筒状ケースの内部が長方形状の広い側が水平方向、狭い側が垂直方向となり、求められる指向特性として水平の指向性は広く、垂直方向は狭くする必要がある。これは、車両等に設置された場合、水平方向は広域な検出範囲を確保するものと、垂直は路面などの誤検出を抑えるためのものである。垂直方向の指向性を狭くするため図４の様に有底筒状ケース７の内部の長方形状の狭い側の側面に開口部を設けるという発明がなされているが、これは市場動向として検出距離の長い用途として応用が始まっている。しかし、検出距離を長く取るため大きな回路利得となっており水平方向の感度も必然的に上がり、車両幅よりも広い検出範囲となり必要以上の物体などの検出をしてシステム運用に支障をきたすものである。
特開２００６−３４５２７１ 谷腰欣司著 「超音波とその使い方−超音波送受波器・超音波モータ」 日刊工業新聞 １９９４年 In an ultrasonic transducer according to a conventional embodiment, when this is embedded in a car bumper or the like and an obstacle around it is detected, the pulse transducer electric signal is input to the ultrasonic transducer to generate an ultrasonic wave. An ultrasonic signal corresponding to the input pulse burst electric signal is oscillated from the sonic transducer, and the oscillated ultrasonic signal is reflected by the obstacle after reaching the obstacle, and part of the ultrasonic signal is the same Return to the ultrasonic transducer. The ultrasonic transducer receives the reflected signal to detect an obstacle and forms a back sensor and a corner sensor.
FIG. 3 shows a schematic longitudinal sectional view of an ultrasonic transducer according to a conventional embodiment. FIG. 3 shows a schematic top view and a cross-sectional view of a bottomed cylindrical case in an ultrasonic transducer according to a conventional embodiment. In FIG. 3, a piezoelectric element 1 is bonded to the inside of the bottom surface of a bottomed cylindrical case 2 made of an aluminum material or the like, and a unimorph vibrator is configured. The input / output lead 5a is taken out from the opposite surface of the piezoelectric element 1 to the bottomed cylindrical case 2 and the input / output lead 5b is taken out from the bottomed cylindrical case 2 by soldering or the like. The adhesive surface side of the piezoelectric element 1 with the bottomed cylindrical case 2 and the bottomed cylindrical case 2 are electrically connected. Further, the piezoelectric element 1, the input / output lead 5a, and the bottomed cylindrical case 2 The input / output lead 5b is electrically connected. The input / output leads 5a and 5b are soldered to the wires of the connector 6 with the PVC coated wire, respectively. A sound absorbing material 3 made of silicone foam or the like is installed on the upper surface of the piezoelectric element 1, and a sealing agent 4 made of an elastic material such as silicone material or urethane material is filled into the bottomed cylindrical case 2 from above. It is configured. All of the side openings of the bottomed cylindrical case 2 need to be filled with a filler 7 made of silicone material, urethane material, or the like.
In the ultrasonic transducer according to the conventional embodiment, the inside of the bottomed cylindrical case is rectangular, the wide side is the horizontal direction, the narrow side is the vertical direction, and the horizontal directivity is wide as the required directivity, the vertical direction Need to be narrow. This is to secure a wide detection range in the horizontal direction when installed in a vehicle or the like, and to suppress erroneous detection of a road surface or the like in the vertical direction. In order to narrow the directivity in the vertical direction, an invention has been made in which an opening is provided on the side of the rectangular narrow side inside the bottomed cylindrical case 7 as shown in FIG. Application has begun as a long use. However, since the detection distance is long, the circuit gain is large and the sensitivity in the horizontal direction is inevitably increased, resulting in a detection range wider than the vehicle width, and detecting more objects than necessary, which hinders system operation. It is.
JP 2006-345271 A Tanikoshi Shinji “Ultrasound and its usage-Ultrasonic transducers and ultrasonic motors” Nikkan Kogyo Shimbun 1994

解決しようとしている課題は有底筒状ケースの内部が長方形状の狭い側の側面に開口部を設けた空中用超音波送受波器において、水平方向の指向性が車両幅よりはみ出し必要以上の検出範囲となる事である。   The problem we are trying to solve is the detection of the directivity in the horizontal direction beyond the width of the vehicle in an aerial ultrasonic transmitter / receiver with an opening on the side of the rectangular narrow side of the bottomed cylindrical case. It is a range.

有底筒状ケースの底面内部に圧電素子を貼り合わせてユニモルフ振動子を構成し、この振動体のケース外側面にて超音波の送信、受信を行う超音波送受波器において、有底筒状ケースの側壁に開口部を設けることにより、内部が長方形状の有底筒状ケースの狭い側の側面に設けた開口部が狭い側の中心軸より開口部の中心軸を一方にずらす事で水平指向性を偏心させて車両幅より検出範囲がはみ出さないようにする。   A unimorph vibrator is constructed by laminating a piezoelectric element inside the bottom surface of a bottomed cylindrical case, and an ultrasonic transducer that transmits and receives ultrasonic waves on the case outer surface of this vibrating body By providing the opening on the side wall of the case, the opening provided on the narrow side of the bottomed cylindrical case with the inside is horizontal by shifting the central axis of the opening to one side from the central axis on the narrow side. The directivity is decentered so that the detection range does not protrude beyond the vehicle width.

内部が長方形状の有底筒状ケースの狭い側の側面に設けた開口部が狭い側の中心軸より開口部の中心軸を一方にずらす事で水平指向性を偏心させる事で車両幅より検出範囲がはみ出さないようにする事が出来る。   Detected from the vehicle width by decentering the horizontal directivity by shifting the central axis of the opening to one side from the central axis of the narrow side of the opening on the narrow side of the bottomed cylindrical case with a rectangular interior It is possible to prevent the range from protruding.

車載用コーナーセンサ等に用いる際、バンパー等に埋め込み設置し、長距離から近距離まで安定した障害物検知を誤作動無く良好な検知範囲の確保を高い信頼性と安定性で実現出来る。   When used in in-vehicle corner sensors, etc., it can be embedded in a bumper, etc., and stable obstacle detection from long to short distances can be achieved with high reliability and stability, ensuring a good detection range without malfunction.

図１は本発明の実施の形態に関わる超音波送受波器の概略縦断面図を表す。図１は本発明の実施の形態に関わる超音波送受波器における有底筒状ケースを用いた概略側面図および断面図を表す。図１おいて、アルミニウム材等から成る内部が長方形状の有底筒状ケース１１は狭い側の側面に狭い側の中心軸より開口部の中心軸を一方にずらした開口部を設けてある。このとき、有底筒状ケースの中心軸は中心軸１２、開口部中心軸は中心軸１３で示している。尚、開口部はアルミニウム材等から成る有底筒状ケース１１の底面から離れていても良く、また開口部はケース上面まで完全に達していても良い。これに両面に電極を設けた圧電素子１の有底筒状ケース１１との接着面側の反対面と圧電素子１から入出力リード５a、又、有底筒状ケース１１から入出力リード５ｂを半田付け等によって取り出す。圧電素子１の有底筒状ケース１１の接着面側電極と有底筒状ケース１１とは電気的に接続されており、有底筒状ケース８の背面開口部に樹脂モールド８と金属製端子９から構成されるモールドを弾性材料から成るスペーサ１０を介して有底筒状ケースに固定し、圧電素子１からの入出力リード５a及び、有底筒状ケース１１からの入出力リード５ｂと樹脂モールド８の金属端子９に半田付け等により電気的に接続する。圧電素子１の上面に発泡シリコーン等から成る吸音材３を載置して、有底筒状ケース１１の背面開口部から内部にかけて金属製端子９の一部を覆うようにシリコーン材、ウレタン材等から成る封止剤４を有底筒状ケース１１内部に充填し構成する。有底筒状ケース１１の側面開口部はすべてシリコーン材、ウレタン材等からなる充填材７を充填しておく必要がある。
図２は本発明の実施の形態に関わる別の超音波送受波器の概略縦断面図を表す。図２は本発明の実施の形態に関わる超音波送受波器における有底筒状ケースを用いた概略側面図および断面図を表す。図２おいて、アルミニウム材等から成る内部が長方形状の有底筒状ケース１１は狭い側の側面に狭い側の中心軸より開口部の中心軸を一方にずらした開口部を設けてある。このとき、有底筒状ケースの中心軸は中心軸１２、開口部中心軸は中心軸１３で示している。尚、開口部はアルミニウム材等から成る有底筒状ケース１１の底面から離れていても良く、また開口部はケース上面まで完全に達していても良い。これに両面に電極を設けた圧電素子１の有底筒状ケース１１との接着面側の反対面と圧電素子１から入出力リード５a、又、有底筒状ケース１１から入出力リード５ｂを半田付け等によって取り出す。圧電素子１の有底筒状ケース１１との接着面側電極と有底筒状ケース１１とは電気的に接続されており、更に、圧電素子１と入出力リード５a及び、有底筒状ケース１１と入出力リード５ｂとは電気的に接続されている。圧電素子１の上面に発泡シリコーン等から成る吸音材３を載置して、入出力リード５ａおよび５ｂはＰＶＣ被覆ワイヤ付きコネクタ６のワイヤにそれぞれ半田付けされている。その上からシリコーン材、ウレタン材等から成る封止剤４を有底筒状ケース１１内部に充填し構成する。有底筒状ケース１１の側面開口部はすべてシリコーン材、ウレタン材等からなる充填材７を充填しておく必要がある。
図４は従来の実施の形態に関わる超音波送受信器と本発明の実施の形態に関わる超音波送受信器の指向特性を比較したものである。本発明の実施の形態における指向性は内部が長方形状の有底筒状ケースの狭い側の側面に設けた開口部が狭い側の中心軸より開口部の中心軸を一方にずらしたことでその方向に指向性の中心軸を偏心させることが出来る。
図５は従来の実施の形態に関わる超音波送受信器を用いたバックセンサの検出範囲の模式図、図６は従来の実施の形態に関わる超音波送受信器と本発明の実施の形態に関わる超音波送受信器を用いたバックセンサの検出範囲の比較模式図を示したものである。図５の様に従来の実施の形態に関わる超音波送受信器を用いたバックセンサは水平方向の検出範囲が広すぎて車両幅より広くなり余計な部分まで検出してしまっている。これに比べ図６の様に本発明の実施の形態に関わる超音波送受信器を用いたバックセンサでは水平方向の指向性を車両の内側に偏心させる事で検出範囲が車両幅よりはみ出さないようにすることが可能となり意図した理想的な検出範囲を得ることが出来る。 FIG. 1 is a schematic longitudinal sectional view of an ultrasonic transducer according to an embodiment of the present invention. FIG. 1 shows a schematic side view and a cross-sectional view using a bottomed cylindrical case in an ultrasonic transducer according to an embodiment of the present invention. In FIG. 1, a bottomed cylindrical case 11 made of an aluminum material or the like having a rectangular inside has an opening in which the central axis of the opening is shifted to one side with respect to the central axis on the narrow side on the side surface on the narrow side. At this time, the center axis of the bottomed cylindrical case is indicated by the center axis 12, and the opening center axis is indicated by the center axis 13. The opening may be separated from the bottom surface of the bottomed cylindrical case 11 made of an aluminum material or the like, and the opening may completely reach the upper surface of the case. On the opposite side of the piezoelectric element 1 having electrodes provided on both sides thereof on the adhesive surface side of the bottomed cylindrical case 11, the input / output lead 5 a from the piezoelectric element 1, and the input / output lead 5 b from the bottomed cylindrical case 11. Remove by soldering. The adhesive surface side electrode of the bottomed cylindrical case 11 of the piezoelectric element 1 and the bottomed cylindrical case 11 are electrically connected, and a resin mold 8 and a metal terminal are formed in the back opening of the bottomed cylindrical case 8. 9 is fixed to a bottomed cylindrical case through a spacer 10 made of an elastic material, and an input / output lead 5a from the piezoelectric element 1, an input / output lead 5b from the bottomed cylindrical case 11, and a resin. It is electrically connected to the metal terminal 9 of the mold 8 by soldering or the like. A sound absorbing material 3 made of foamed silicone or the like is placed on the upper surface of the piezoelectric element 1, and a silicone material, a urethane material, or the like is provided so as to cover a part of the metal terminal 9 from the back opening to the inside of the bottomed cylindrical case 11. The bottomed cylindrical case 11 is filled with a sealant 4 made of All of the side openings of the bottomed cylindrical case 11 need to be filled with a filler 7 made of a silicone material, a urethane material or the like.
FIG. 2 is a schematic longitudinal sectional view of another ultrasonic transducer according to the embodiment of the present invention. FIG. 2 shows a schematic side view and cross-sectional view using a bottomed cylindrical case in the ultrasonic transducer according to the embodiment of the present invention. In FIG. 2, a bottomed cylindrical case 11 made of aluminum or the like having a rectangular interior is provided with an opening in which the central axis of the opening is shifted to one side from the central axis on the narrow side on the side surface on the narrow side. At this time, the center axis of the bottomed cylindrical case is indicated by the center axis 12, and the opening center axis is indicated by the center axis 13. The opening may be separated from the bottom surface of the bottomed cylindrical case 11 made of an aluminum material or the like, and the opening may completely reach the upper surface of the case. On the opposite side of the piezoelectric element 1 having electrodes provided on both sides thereof on the adhesive surface side of the bottomed cylindrical case 11, the input / output lead 5 a from the piezoelectric element 1, and the input / output lead 5 b from the bottomed cylindrical case 11. Remove by soldering. The adhesive surface side electrode of the piezoelectric element 1 with the bottomed cylindrical case 11 and the bottomed cylindrical case 11 are electrically connected, and the piezoelectric element 1, the input / output lead 5a, and the bottomed cylindrical case are further connected. 11 and the input / output lead 5b are electrically connected. A sound absorbing material 3 made of foamed silicone or the like is placed on the upper surface of the piezoelectric element 1, and the input / output leads 5a and 5b are respectively soldered to the wires of the connector 6 with a PVC-coated wire. A sealing agent 4 made of a silicone material, a urethane material, or the like is filled into the bottomed cylindrical case 11 from above. All of the side openings of the bottomed cylindrical case 11 need to be filled with a filler 7 made of a silicone material, a urethane material or the like.
FIG. 4 compares the directivity characteristics of the ultrasonic transceiver according to the conventional embodiment and the ultrasonic transceiver according to the embodiment of the present invention. The directivity in the embodiment of the present invention is that the opening provided on the narrow side surface of the bottomed cylindrical case whose interior is rectangular is shifted by shifting the central axis of the opening to one side from the central axis on the narrow side. The central axis of directivity can be decentered in the direction.
FIG. 5 is a schematic diagram of a detection range of a back sensor using an ultrasonic transmitter / receiver according to the conventional embodiment, and FIG. 6 is an ultrasonic transmitter / receiver according to the conventional embodiment and an ultrasonic according to the embodiment of the present invention. The comparison schematic diagram of the detection range of a back sensor using a sound wave transceiver is shown. As shown in FIG. 5, the back sensor using the ultrasonic transceiver according to the conventional embodiment has a detection range in the horizontal direction that is too wide and wider than the vehicle width, and has detected an extra portion. In contrast, in the back sensor using the ultrasonic transceiver according to the embodiment of the present invention as shown in FIG. 6, the detection range does not protrude beyond the vehicle width by decentering the horizontal directivity to the inside of the vehicle. And an intended ideal detection range can be obtained.

本発明は、車のバックセンサのみならず、防滴型超音波送受波器が利用されている様々な分野に適用できる。   The present invention can be applied not only to a back sensor of a car but also to various fields where a drip-proof ultrasonic transducer is used.

本発明の実施の形態に関わる超音波送受波器における有底筒状ケースの概略側天面図及び断面図、ケースのみの視斜図Schematic side top view and sectional view of a bottomed cylindrical case in an ultrasonic transducer according to an embodiment of the present invention, oblique view of only the case 本発明の別の実施の形態に関わる超音波送受波器における有底筒状ケースの概略側天面図及び断面図Schematic side top view and sectional view of a bottomed cylindrical case in an ultrasonic transducer according to another embodiment of the present invention 従来の実施の形態に関わる超音波送受波器の概略側天面図及び縦断面図Schematic side top view and longitudinal sectional view of an ultrasonic transducer according to a conventional embodiment 本発明の実施の形態に関わる超音波送受信器と従来の実施の形態に関わる超音波送受波器の指向性比較図Directivity comparison diagram of the ultrasonic transmitter / receiver according to the embodiment of the present invention and the ultrasonic transmitter / receiver according to the conventional embodiment 従来の実施の形態に関わる超音波送受信器を用いたパックセンサの検出範囲の模式図Schematic diagram of detection range of pack sensor using ultrasonic transmitter / receiver related to conventional embodiment 本発明の実施の形態に関わる超音波送受信器を用いたパックセンサと従来の実施の形態に関わる超音波送受信器を用いたバックセンサとの検出範囲の模式図比較Schematic comparison of detection ranges of a pack sensor using an ultrasonic transceiver according to an embodiment of the present invention and a back sensor using an ultrasonic transceiver according to a conventional embodiment

１ 圧電素子
２ 有底筒状ケース
３ 吸音材
４ 封止剤
５ａ 入出力リード
５ｂ 入出力リード
６ ＰＶＣ被覆ワイヤ付きコネクタ
７ 側面充填材
８ 樹脂製モールド
９ 金属製端子
１０ スペーサ
１１ 本発明の実施の形態に関わる有底筒状ケース
１２ 有底筒状ケースの中心軸
１３ 本発明の実施の形態に関わる有底筒状ケースの側面開口部の中心軸 DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Bottomed cylindrical case 3 Sound-absorbing material 4 Sealant 5a Input / output lead 5b Input / output lead
6 Connector with PVC Covered Wire 7 Side Filler 8 Resin Mold 9 Metal Terminal 10 Spacer 11 Bottomed Cylindrical Case Related to Embodiment of the Present Invention 12 Center Axis of Bottomed Cylindrical Case 13 Embodiment of the Present Invention Center axis of side opening of bottomed cylindrical case

Claims (1)

有底筒状ケースの底面内部に圧電素子を貼り合わせユニモルフ振動子を形成し、ユニモルフ振動子の振動によって超音波の送受信を行う空中用超音波送受波器において、内部が長方形状の有底筒状ケースの狭い側の側面に設けた開口部が狭い側の中心軸より開口部の中心軸を一方にずらしたことを特徴とする空中用超音波送受波器。 A bottomed tube with a rectangular interior in an aerial ultrasonic transducer that forms a unimorph transducer by attaching a piezoelectric element inside the bottom surface of a bottomed cylindrical case, and transmits and receives ultrasonic waves by the vibration of the unimorph transducer. An aerial ultrasonic transducer characterized in that the opening provided on the narrow side surface of the case is shifted to the center of the opening from the center axis on the narrow side.
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Publication number Priority date Publication date Assignee Title
JP2005039689A (en) * 2003-07-18 2005-02-10 Nippon Ceramic Co Ltd Ultrasonic sensor
JP2006345271A (en) * 2005-06-09 2006-12-21 Nippon Ceramic Co Ltd Ultrasonic wave transceiver
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