WO2014136221A1 - 障害物検知装置 - Google Patents
障害物検知装置 Download PDFInfo
- Publication number
- WO2014136221A1 WO2014136221A1 PCT/JP2013/056140 JP2013056140W WO2014136221A1 WO 2014136221 A1 WO2014136221 A1 WO 2014136221A1 JP 2013056140 W JP2013056140 W JP 2013056140W WO 2014136221 A1 WO2014136221 A1 WO 2014136221A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ultrasonic sensor
- matching layer
- obstacle detection
- detection device
- acoustic matching
- Prior art date
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Classifications
-
- 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
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/09—Analysing solids by measuring mechanical or acoustic impedance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/48—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects combined with, or convertible into, other devices or objects, e.g. bumpers combined with road brushes, bumpers convertible into beds
- B60R19/483—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects combined with, or convertible into, other devices or objects, e.g. bumpers combined with road brushes, bumpers convertible into beds with obstacle sensors of electric or electronic type
-
- 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
- G10K9/22—Mountings; Casings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/018—Impedance
-
- 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
- G01S2015/937—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details
- G01S2015/938—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details in the bumper area
Definitions
- the present invention relates to an obstacle detection device that is attached to, for example, a bumper of a vehicle such as an automobile and detects an obstacle around the vehicle.
- an aerial ultrasonic sensor using a piezoelectric element an ultrasonic wave is transmitted from the sensor to the air, the ultrasonic wave is reflected by an obstacle or the like, propagates in the air, and is received by the sensor again. An object is detected.
- This aerial ultrasonic sensor is attached to a wall member such as a bumper of a vehicle such as an automobile via a through hole formed in the wall member, thereby detecting an obstacle around the vehicle. (See, for example, Patent Document 1).
- an aerial ultrasonic sensor used in an obstacle detection device is attached in a state where its radiation surface is exposed to the outside through a through-hole so that ultrasonic waves can be transmitted and received.
- the aerial ultrasonic sensor is attached with its radiation surface exposed to the outside.
- the bumper of the vehicle is made of a resin material
- the case of the aerial ultrasonic sensor is made of a metal material. Therefore, when the radiation surface of the airborne ultrasonic sensor is attached to the bumper with the radiation surface of the airborne ultrasonic sensor exposed to the outside as described above, the radiation surface of the airborne ultrasonic sensor can be recognized from the outside.
- the same coating is applied to the radiation surfaces of the bumper and the airborne ultrasonic sensor, the materials are different from each other.
- the bumper is not provided with a through hole and is attached so that the radiation surface of the aerial ultrasonic sensor is not exposed to the outside, the sensitivity of the aerial ultrasonic sensor is significantly reduced.
- the present invention has been made to solve the above-described problems, and an object thereof is to provide an obstacle detection device capable of improving sensor sensitivity and improving design.
- the obstacle detection device includes an aerial ultrasonic sensor attached to a through hole of an attachment portion with a radiation surface facing outside, and an acoustic impedance of the aerial ultrasonic sensor and air acoustics fixed to the radiation surface. It is provided with an acoustic matching layer in which microcapsules are added to the same material as that of the mounting portion for matching with impedance.
- FIG. 1 is a schematic diagram showing the configuration of an obstacle detection apparatus according to Embodiment 1 of the present invention
- FIG. 2 is a schematic diagram showing the configuration of an aerial ultrasonic sensor 2 to which an acoustic matching layer 3 is fixed.
- the obstacle detection device includes an aerial ultrasonic sensor 2 and an acoustic matching layer 3 attached to the through hole 11 of the attachment portion 1.
- the attachment portion 1 is a bumper or body of a vehicle such as an automobile, and is formed of a synthetic resin material such as polypropylene resin.
- the aerial ultrasonic sensor 2 detects an obstacle around the vehicle, and is attached to the through hole 11 of the attachment portion 1 with the radiation surface 21a facing outside. As shown in FIG. 2, the aerial ultrasonic sensor 2 includes a case 21 formed of a metal material such as aluminum, an ultrasonic transducer 22, and a lead wire 23.
- the acoustic matching layer 3 is formed of the same material as that of the mounting portion 1 and is added with a predetermined amount of microcapsules 31 such as glass or organic matter, and is fixed to the radiation surface 21 a of the air ultrasonic sensor 2.
- the acoustic matching layer 3 is for matching the acoustic impedance of the airborne ultrasonic sensor 2 with the acoustic impedance of air.
- the acoustic impedance of the acoustic matching layer 3 is a value between the acoustic impedance of the airborne ultrasonic sensor 2 and the acoustic impedance of air.
- the addition amount of the microcapsule 31 is determined.
- Z s is the acoustic impedance of the aerial ultrasonic sensor 2
- Z a is the acoustic impedance of air
- Z m is the acoustic impedance of the acoustic matching layer 3.
- the aerial ultrasonic sensor 2 of the obstacle detection apparatus applies a voltage to the ultrasonic transducer 22 via the lead wire 23 to excite the ultrasonic wave and to transmit the ultrasonic wave into the air. send. Then, the ultrasonic wave transmitted from the aerial ultrasonic sensor 2 is reflected by an obstacle and received again by the aerial ultrasonic sensor 2. Thereby, an obstacle can be detected.
- the obstacle detection device is attached to the front, rear, or corner of the vehicle so that obstacles around the vehicle can be detected.
- the acoustic matching layer 3 on the radiation surface 21a of the aerial ultrasonic sensor 2, the acoustic impedance of the aerial ultrasonic sensor 2 and the acoustic impedance of air can be matched.
- reflection of ultrasonic waves at the boundary between the aerial ultrasonic sensor 2 and the acoustic matching layer 3 and the boundary between the acoustic matching layer 3 and air can be suppressed, and the propagation efficiency of ultrasonic waves can be increased.
- the sensitivity of the airborne ultrasonic sensor 2 is improved.
- the acoustic matching layer 3 fixed to the radiation surface 21a of the aerial ultrasonic sensor 2 is disposed so as to be exposed to the outside from the through hole 11 of the attachment portion 1. And since the acoustic matching layer 3 is formed with the same material as the attachment part 1, the aerial ultrasonic sensor 2 becomes difficult to recognize and the design is improved.
- the acoustic matching layer 3 formed of the same material as that of the attachment portion 1 is fixed to the radiation surface 21 a of the aerial ultrasonic sensor 2 and attached to the attachment portion 1.
- the sensor sensitivity can be improved and the design can be improved.
- Embodiment 2 the conditions for determining the addition amount of the microcapsule 31 are changed.
- the configuration of the obstacle detection device according to the second embodiment is the same as the configuration shown in FIG.
- the acoustic impedance of the acoustic matching layer 3 is approximately the square root of the product of the acoustic impedance of the airborne ultrasonic sensor 2 and the acoustic impedance of air, as shown in Equation (2).
- the addition amount of the microcapsule 31 is determined so as to be a value.
- the amount of addition of the microcapsules 31 in the acoustic matching layer 3 is determined to be an amount that satisfies the relationship of the expression (2), so that Sensor sensitivity can be further improved.
- FIG. Embodiment 3 shows a case where the thickness of the acoustic matching layer 3 is determined under a predetermined condition.
- FIG. 3 is a schematic diagram showing a configuration of an obstacle detection apparatus according to Embodiment 3 of the present invention.
- the obstacle detection device according to the third embodiment shown in FIG. 3 is the same except that the thickness of the acoustic matching layer 3 of the obstacle detection device according to the first embodiment shown in FIG. Only explain.
- the same coating 4 is applied to the surface of the attachment portion 1 and the surface of the acoustic matching layer 3.
- the aerial ultrasonic sensor 2 is positioned so that the surface of the acoustic matching layer 3 is flush with the surface of the attachment portion 1.
Abstract
Description
また、バンパと空中超音波センサの放射面に同一の塗装を施した場合、両者の材料が異なるため、その発色が異なり、デザイン性が低下するという課題もある。
一方、デザイン性を考慮し、バンパに貫通孔を設けず、空中超音波センサの放射面が外部に露出しないように取り付けた場合、空中超音波センサの感度は著しく低下する。
実施の形態1.
図1はこの発明の実施の形態1に係る障害物検知装置の構成を示す概略図であり、図2は音響整合層3が固着された空中超音波センサ2の構成を示す概略図である。
障害物検知装置は、図1に示すように、取り付け部1の貫通孔11に取り付けられた空中超音波センサ2及び音響整合層3から構成されている。
なお、取り付け部1は、自動車等の車両のバンパやボディ等であって、ポリプロピレン樹脂等の合成樹脂材料で形成されたものである。
なお、Zsは空中超音波センサ2の音響インピーダンスであり、Zaは空気の音響インピーダンスであり、Zmは音響整合層3の音響インピーダンスである。
実施の形態2は、マイクロカプセル31の添加量を決める条件を変更したものである。なお、実施の形態2に係る障害物検知装置の構成は、図1に示す構成と同様であり、その説明を省略する。
なお、実施の形態2に係る障害物検知装置の動作は、実施の形態1の場合と同様であり、その説明を省略する。
実施の形態3では、音響整合層3の厚みを所定の条件で決定した場合について示す。
図3はこの発明の実施の形態3に係る障害物検知装置の構成を示す概略図である。図3に示す実施の形態3に係る障害物検知装置は、図1に示す実施の形態1に係る障害物検知装置の音響整合層3の厚みを変更した点以外は同一であり、異なる部分についてのみ説明を行う。
なお、実施の形態3に係る障害物検知装置の動作は、実施の形態1の場合と同様であり、その説明を省略する。
実施の形態4では、障害物検知装置の表面に塗装4を施した場合について示す。
図4はこの発明の実施の形態4に係る障害物検知装置の構成を示す概略図である。図4に示す実施の形態4に係る障害物検知装置は、図1に示す実施の形態1に係る障害物検知装置の表面に塗装4を施した点以外は同一であり、異なる部分についてのみ説明を行う。
なお、実施の形態3に係る障害物検知装置の動作は、実施の形態1の場合と同様であり、その説明を省略する。
21a 放射面、21 ケース、22 超音波振動子、23 リード線、31 マイクロカプセル。
Claims (7)
- 放射面を外部に向けて、取り付け部の貫通孔に取り付けられた空中超音波センサと、
前記放射面に固着され、前記空中超音波センサの音響インピーダンスと空気の音響インピーダンスとのマッチングを取る、前記取り付け部と同一材料にマイクロカプセルが添加された音響整合層と
を備えた障害物検知装置。 - 前記マイクロカプセルの添加量は、前記音響整合層の音響インピーダンスが、前記空中超音波センサの音響インピーダンスと空気の音響インピーダンスとの間の値となる量である
ことを特徴とする請求項1記載の障害物検知装置。 - 前記マイクロカプセルの添加量は、前記音響整合層の音響インピーダンスが、前記空中超音波センサの音響インピーダンスと空気の音響インピーダンスとの積の略平方根の値となる量である
ことを特徴とする請求項2記載の障害物検知装置。 - 前記音響整合層の厚みは、前記空中超音波センサで励振される超音波の波長の略1/4である
ことを特徴とする請求項1記載の障害物検知装置。 - 前記音響整合層の表面は、前記取り付け部の表面と面一である
ことを特徴とする請求項1記載の障害物検知装置。 - 前記音響整合層は、前記取り付け部と同一材料からなり、表面に当該取り付け部の表面とともに同一の塗料が施された
ことを特徴とする請求項1記載の障害物検知装置。 - 前記取り付け部は、車両のバンパ又はボディである
ことを特徴とする請求項1記載の障害物検知装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2013/056140 WO2014136221A1 (ja) | 2013-03-06 | 2013-03-06 | 障害物検知装置 |
US14/768,083 US20160003778A1 (en) | 2013-03-06 | 2013-03-06 | Obstacle detection device |
DE112013006785.4T DE112013006785T5 (de) | 2013-03-06 | 2013-03-06 | Hinderniserkennungsvorrichtung |
JP2015504054A JPWO2014136221A1 (ja) | 2013-03-06 | 2013-03-06 | 障害物検知装置 |
CN201380073971.2A CN105008953A (zh) | 2013-03-06 | 2013-03-06 | 障碍物检测装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2013/056140 WO2014136221A1 (ja) | 2013-03-06 | 2013-03-06 | 障害物検知装置 |
Publications (1)
Publication Number | Publication Date |
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WO2014136221A1 true WO2014136221A1 (ja) | 2014-09-12 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2013/056140 WO2014136221A1 (ja) | 2013-03-06 | 2013-03-06 | 障害物検知装置 |
Country Status (5)
Country | Link |
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US (1) | US20160003778A1 (ja) |
JP (1) | JPWO2014136221A1 (ja) |
CN (1) | CN105008953A (ja) |
DE (1) | DE112013006785T5 (ja) |
WO (1) | WO2014136221A1 (ja) |
Citations (3)
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JPH02127897A (ja) * | 1988-11-08 | 1990-05-16 | Murata Mfg Co Ltd | 空中超音波トランスデューサ |
JP2009020086A (ja) * | 2006-09-22 | 2009-01-29 | Denso Corp | 超音波センサ |
WO2012144270A1 (ja) * | 2011-04-20 | 2012-10-26 | 日産自動車株式会社 | ソナーセンサの取付構造 |
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JP3611796B2 (ja) * | 2001-02-28 | 2005-01-19 | 松下電器産業株式会社 | 超音波送受波器、超音波送受波器の製造方法及び超音波流量計 |
EP1477778A1 (en) * | 2002-01-28 | 2004-11-17 | Matsushita Electric Industrial Co., Ltd. | Acoustic matching layer, ultrasonic transmitter/receiver, and ultrasonic flowmeter |
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US6788620B2 (en) * | 2002-05-15 | 2004-09-07 | Matsushita Electric Ind Co Ltd | Acoustic matching member, ultrasound transducer, ultrasonic flowmeter and method for manufacturing the same |
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JP2006345312A (ja) * | 2005-06-09 | 2006-12-21 | Denso Corp | 超音波センサ及び超音波振動子 |
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2013
- 2013-03-06 US US14/768,083 patent/US20160003778A1/en not_active Abandoned
- 2013-03-06 CN CN201380073971.2A patent/CN105008953A/zh active Pending
- 2013-03-06 DE DE112013006785.4T patent/DE112013006785T5/de active Pending
- 2013-03-06 WO PCT/JP2013/056140 patent/WO2014136221A1/ja active Application Filing
- 2013-03-06 JP JP2015504054A patent/JPWO2014136221A1/ja active Pending
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JPH02127897A (ja) * | 1988-11-08 | 1990-05-16 | Murata Mfg Co Ltd | 空中超音波トランスデューサ |
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WO2012144270A1 (ja) * | 2011-04-20 | 2012-10-26 | 日産自動車株式会社 | ソナーセンサの取付構造 |
Also Published As
Publication number | Publication date |
---|---|
DE112013006785T5 (de) | 2015-12-10 |
US20160003778A1 (en) | 2016-01-07 |
JPWO2014136221A1 (ja) | 2017-02-09 |
CN105008953A (zh) | 2015-10-28 |
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