JPS60194380A - Ultrasonic sensor - Google Patents

Ultrasonic sensor

Info

Publication number
JPS60194380A
JPS60194380A JP59050680A JP5068084A JPS60194380A JP S60194380 A JPS60194380 A JP S60194380A JP 59050680 A JP59050680 A JP 59050680A JP 5068084 A JP5068084 A JP 5068084A JP S60194380 A JPS60194380 A JP S60194380A
Authority
JP
Japan
Prior art keywords
horn
mounting plate
opening
attachment
bumper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP59050680A
Other languages
Japanese (ja)
Inventor
Shinichi Ishimaru
石丸　信一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP59050680A priority Critical patent/JPS60194380A/en
Publication of JPS60194380A publication Critical patent/JPS60194380A/en
Pending legal-status Critical Current

Links

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
    • 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
    • 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

Abstract

PURPOSE:To enhance the reliability of the titled sensor by preventing the erroneous detection of the surface, by forming the front surface opening part of a horn in a long oval shape to arrange the short diameter direction thereof to a horizontal direction and upwardly inclining the center axis direction of the horn in the opening side. CONSTITUTION:The attachment of an ultrasonic sensor to a bumper is performed by a C-shaped bracket 20. The protruded frame part 28 of attachment rubber 25 is contacted with the bumper and attachment bolts 30 protruded from a rear stage part are inserted into the bolt piercing holes of a bracket 27 and nuts 31 are clamped to the attachment bolts 30 to fix the horn 4. By this method, the horn 4 is attached so as to direct the short diameter direction of the opening part provided to the horn 4 to a horizontal direction. Taper is applied to the back surface of the attachment rubber 25, and because said taper is thick at the lower part thereof and thin at the upper part thereof, the central axis of the horn 4 is directed upwardly in the opening side.

Description

【発明の詳細な説明】 （技術分野） 本発明は車のバンパー等に取付けられて後退時に障害物
を検知する超音波センサーに関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an ultrasonic sensor that is attached to the bumper of a car and detects obstacles when reversing.

（背景技術） 車のバンパー等の取付板は車体の下方にあり、超音波セ
ンサーはこの部分に設けられており、車を後退させると
き後ろに障害物があると検知して警告するようになって
いる。しかしながら、発信された超音波はホーンから遠
方になるほどその検知エリアが広がるものであり、又車
体は上下動するものであるため、地面を障害物として誤
検知してしまうという問題があった。(Background technology) The mounting plate for a car's bumper, etc. is located at the bottom of the car body, and an ultrasonic sensor is installed in this part to detect and warn if there is an obstacle behind the car when backing up. ing. However, the detection area of the emitted ultrasonic waves increases as the distance from the horn increases, and since the vehicle body moves up and down, there is a problem in that the ground may be falsely detected as an obstacle.

（発明の目的） １　本発明は叙上の従来例の欠点に鑑みてなされたもの
であり、その目的とするところは地面を誤検更　知する
ことを防止し、超音波センサーの信頼性を向上させるこ
とＫある。(Object of the invention) 1 The present invention has been made in view of the drawbacks of the conventional examples described above, and its purpose is to prevent false ground detection and update and improve the reliability of ultrasonic sensors. There are things I can improve.

ｒ為印の■云） 木発す］は、車（１）のバンパー（２）のような取付板
（３）Ｋ固定する超音波センサーであって、ホーン（４
）の前面ｆｉ開口部（５）を長円形に形成してその短径
方向を水平方向に向けて配置し、ホーン（４）の中心軸
の方向を開口側で上向きに傾斜させたものであり、これ
によって上記目的を達成するに至った。The ultrasonic sensor is fixed to a mounting plate (3) K, such as the bumper (2) of a car (1), and is attached to a horn (4).
), the front fi opening (5) is formed into an oval shape, and its short axis direction is oriented horizontally, and the direction of the central axis of the horn (4) is inclined upward on the opening side. , thereby achieving the above objective.

以下、本発明の実施例を添付図により詳述する。第１図
（ａ）に示すように、バンパー（２）が取伺板（３）と
なっており、超音波ｔ′Ｊサー囚は車（１）の後部のバ
ンパー（２）に３個取付けられている。しかして、車（
１）の後退時には、壁面などの障害物（６）からの超音
波の反射を検出して車（ｌと障害物（６）との聞の距゛
　離を計測し、一定距離以内に−なれば警報を発するよ
うに制御回路ブロック（７）内の制御回路へ信号を送る
ように々っている。第１図（ｂ）　Ｋ示すものでは、距
離がａ、ｂ、ｃになったときに夫々第１１第２、＠３の
警報を発するよう３段階に設定しである。Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. As shown in Fig. 1 (a), the bumper (2) serves as a pickup plate (3), and three ultrasonic t'J sensors are attached to the rear bumper (2) of the car (1). It is being However, the car (
When reversing the vehicle (1), the distance between the vehicle (l) and the obstacle (6) is measured by detecting the reflection of ultrasonic waves from obstacles (6) such as walls, and the distance between the vehicle (l) and the obstacle (6) is measured, and the distance between the vehicle (l) and the obstacle (6) is measured. If the distance is a, b, or c, the signal is sent to the control circuit in the control circuit block (7) to issue an alarm. It is set in three stages to issue 11th, 2nd, and 3rd alarms, respectively.

超音波センサー（５）は、第７図に示すように、長袖方
向が縦に々つだ長円形の開口部（５）を有するホーン（
４）と、ホーン（４）基部ＶＣ設けた第１筐体（８）と
第２筐体（９）とを備えており、第１＠休（８）内には
防振ゴム＋セップ（ｌＯ）を介してマイクロフォン（川
が収納されており、第２＠体（９）内にはアンプ回路部
品を取着したづリント基板（璃カニ納められている。超
音波センサー（５）はホーン（４）の前面開口部（６）
の短径方向が水平方向を向くようにしてバンパー（２）
に配置されており、このような配置で取付けることによ
って超音波セシサー囚の検知エリアは第３図の一点鎖線
で囲んだ部分Ｒのように縦に狭く、横に広く拡がった形
となっており、地面を検知しにくいようになっている。As shown in FIG. 7, the ultrasonic sensor (5) is a horn (
4), a first housing (8) and a second housing (9) provided with a horn (4) base VC. ) is housed in the microphone, and inside the second body (9) is a lint board (likani) with amplifier circuit components attached.The ultrasonic sensor (5) is connected to the horn ( 4) Front opening (6)
Bumper (2) with the short diameter direction facing horizontally.
By installing it in this arrangement, the detection area of the ultrasonic secessor becomes narrow vertically and wide wide horizontally, as shown in the area R surrounded by the dashed-dotted line in Figure 3. , making it difficult to detect the ground.

又、第５図及び第６図に示すように、第２筺体（９）内
にはシリコン充填剤０３）を充填してあり、これによっ
てづリント基板θ匂をｔ−ルドし、アンプ回路部品の防
水と、シリコン充填剤（＋３）の弾性によって防振を図
り、残響を小さくしである。又、第１＠休（８）内にお
いては、マイクロフォン（１１）は防振ｊム士ヤッ″：
５　（１０１Ｋよってカバーされ、音響的に）０−ティ
′、Ｉりされている。このように第１筐体（８）内でマ
イクロフォン（１１）が防振ｊム十セッづ（１０）によ
ってカバーされているので、防振ゴム士セップ（１０）
の耐候性か増し、劣化の問題がなく、いつまでもフロー
テインク作用が持続するのである。第２筐体（９）の後
端開口部は防水用づム板θ蜀で蓋をされ、その上から口
字状をした固定金具（１５１で押えられている。又、こ
の固定金具θ荀は第１筐体（８）と第２筐体（９）とを
固定するものであり、第１筐体（８）の両側に形成され
たり’ｊ　（１６）　Ｋ固定金具（＋５１の先の開口（
１７）を嵌合させ、固定金具（＋５）の先のかしめ片（
１１１９を第１筐体（８）の傾斜リプθ９）にかしめ、
これによって第１筐体（８）と第２筐体（９）とを抱く
ようにして一体化しである。更に、固定金具θ６）の両
側にはスリット彌を形成してあり、固定金具θ６）で第
１筐体（８）と第２筐体（９）とを固定した際に、防水
用ゴム板θ４）が押圧され、第６図のように膨張した部
分がスリット（２０）から逃げるようにしである。防水
用ゴム板（＋４）にけづツシ、７り０υが一体形成され
ており、プリント基板−からのリード線（濶がプッシン
ク（２０に押通されて外部へ引き出されている。ホーン
ｌｊ１／Ｔ＋―−−Ｗ；ｌ’ｙ日ｏｒ’＋☆ｎ１ｅｔＩ
ｙ１．Ｊ／ｉｊ＋丁しＣｔｒｓ−１＝−、＝”、ｌりり
１−４ｚニレ≦ヒ片されており、フランジ（２３ｉ裏面
の短径側の両側には断面り形のリプ（２４）が設けられ
ている。シ：ＪＩ　＃−を収句ゴム板であり、ホーン（
４）のフランジ（２：りに嵌着してりづ嵌合片（２６）
をりづ（２４）内に係合してフランジ（２３ｉに収着さ
れるようＫなりている。又、取付ゴム板Ｇ！！ｔｌの裏
面にはテーパが施されていて、下部が厚く、上部が薄く
なっている。In addition, as shown in FIGS. 5 and 6, the second housing (9) is filled with a silicon filler 03), which removes the lint board θ odor and protects the amplifier circuit components. Waterproofing and the elasticity of the silicone filler (+3) provide vibration isolation and reduce reverberation. Also, during the first holiday (8), the microphone (11) is equipped with a vibration-proof system.
5 (covered by 101K, acoustically) 0-T', I. In this way, the microphone (11) is covered by the anti-vibration rubber set (10) in the first housing (8), so the vibration-proof rubber part (10)
This increases the weather resistance of the ink, eliminates the problem of deterioration, and maintains the float ink effect indefinitely. The rear end opening of the second casing (9) is covered with a waterproof rubber plate θX, and is held down from above by a mouth-shaped fixing metal fitting (151). are used to fix the first housing (8) and the second housing (9), and are formed on both sides of the first housing (8). Opening (
17), and tighten the caulking piece (
1119 to the inclined lip θ9) of the first casing (8),
As a result, the first casing (8) and the second casing (9) are held together and integrated. Furthermore, slits are formed on both sides of the fixing metal fitting θ6), so that when the first housing (8) and the second housing (9) are fixed with the fixing metal fitting θ6), the waterproof rubber plate θ4 ) is pressed so that the expanded portion escapes from the slit (20) as shown in Figure 6. A waterproof rubber plate (+4) is integrally formed with a hook and a 7-pin, and the lead wire from the printed circuit board is pushed through the push-sink (20 and pulled out to the outside. T+---W;l'y day or'+☆n1etI
y1. J/ij+Ctrs-1=-,='', liriri1-4zElm≦Here is cut, and a cross-section shaped lip (24) is provided on both sides of the minor diameter side of the flange (23i). SI: JI #- is a rubber plate and a horn (
4) Flange (2: Rizu fitting piece (26)
The mounting rubber plate G!!tl is tapered on the back side and is thick at the bottom. The top is thin.

しかして、バンパ〜（２］への取付けは口字状のブラケ
ットａ’ｒ）によって行なわれ、バンパー（２）に取付
ゴム板ＣＩ’！＋１の突出枠部（′／、８ｊを当接し、
ブラケット（２７＋のボルト押通孔Ｑ９ｊに超省波セン
υ−囚の後端部より突出した取付ボルト０６を挿入し、
収伺ポルトＯ（υにナツト鴫）を締付けて固定するもの
である。これによって、超音波センサー（Ａ）はホーン
（４）の開口部（５）の短径方向が水平方向に向くよう
に収伺けられ、しかもホーン（４）の中心軸が開口側で
上向きとなるようになっていて一届地面を誤検知しＫく
いようになっている。Therefore, the attachment to the bumper (2) is carried out using a square-shaped bracket a'r), and the rubber plate CI'! is attached to the bumper (2). +1 protruding frame part ('/, 8j abuts,
Insert the mounting bolt 06 protruding from the rear end of the ultra-wave saving sensor υ- into the bolt through hole Q9j of the bracket (27+),
It is fixed by tightening the mounting port O (with a nut on υ). As a result, the ultrasonic sensor (A) can be housed so that the short diameter direction of the opening (5) of the horn (4) is oriented horizontally, and the center axis of the horn (4) is oriented upward on the opening side. It is designed to be so, that it falsely detects the ground and ends up hitting K.

このようにしてバンパー（２）に取付けられた超音波セ
ンサー（３）は！ｆ＋］の皿体の下に数州−けちれ斧佃
１御回路ブロック（７）にケーづル線ｅｚを介して接続
される。この制御回路ブロック（７）の構造を第８図乃
至第１６図に示しである。（３３）は外周に断面半円形
状の突出しリプ（其を形成したゴム板であり、シール面
側には若干用ｎＬをおいて？Ｍ、数個のプリント基板丙
保持用のリプ（３６）を設けである。そして、このり−
５軸のスリット溝闘内にプリント基板１３５１を保持さ
せである。（３８）は絞り板金又は成形品等のケースで
あり、（３９１はケース鯛）と対をなす板金あるいは成
形品のノコバーであり、内面周囲にはヒートい０）が突
出させられている。そして、ケース１３８）のｉ＆　ｂ
カバー　（３９１との間でｊム板１３３）を挾持し、突
出しり′ｊ（翼を圧縮して防水構造きし、じ−ド（４ｏ
）をゴム板ｆ３３）の溝１４１）に嵌合させて位置ずれ
を防止しである。尚、４４医はブツシュであり、＋４５
１１４６１は夫々リード線０ηさケーブル線（４９を通
す孔である。The ultrasonic sensor (3) attached to the bumper (2) in this way! f+] is connected to the Kashu-Kekire Atsukuda 1 control circuit block (7) via a cable wire ez under the dish body. The structure of this control circuit block (7) is shown in FIGS. 8 to 16. (33) is a rubber plate with a semicircular cross-sectional protruding lip on the outer periphery, and there are several lips (36) for holding the printed circuit board with a slight gap on the sealing surface side. This is the setting.
The printed circuit board 1351 is held within the 5-axis slit groove. (38) is a case made of drawn sheet metal or a molded product, and (391 is a saw bar of a sheet metal or molded product that is paired with the case), with a heat shield protruding around the inner surface. and i & b in case 138)
The cover (391) is held between the j-board (133) and the protruding wing (blade is compressed to create a waterproof structure).
) is fitted into the groove 141) of the rubber plate f33) to prevent misalignment. In addition, the 44th doctor is Butshu, +45
Reference numerals 11461 are holes through which the lead wires (0η) of the cable wires (49) are passed.

（発明の効果） 本発明は叙述の如く構成されているから、ホーンのＲ長
の開口部によって検知エリアが横に広がり、しかもホー
ンは上方へ向けられているがら地面を誤検知することが
なく、信頓性が向上するという利点がある。(Effects of the Invention) Since the present invention is configured as described above, the detection area is expanded laterally due to the R-length opening of the horn, and even though the horn is directed upward, there is no false detection of the ground. , which has the advantage of improving credibility.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図（ａ）　（ｂ）は超音波センサーの取（−１状態
及びその検知動作を示す説明図、第２図及び第一３図は
同上の拡大側面図及び正面図、第４図は同上の分解斜視
図、第５図及び第６図は超音波センサーの縦断面図及び
水平断面図、第７図は同上の分解斜視図、第８図は制御
回路ブロックの断面図、第９図は同上の分解斜視図、第
１０図はゴム板の平面図、第１１図乃至第１３図はケー
ス、ゴム板及びカバーの部分拡大断面図、第１４図（ａ
）　（ｂ）はリード線用のブツシュ部分の分解断面図及
びブツシュの断面図、第１５図はケーブル線用のブツシ
ュ部分の分解断面図、第１６図は同上のブツシュの断面
図である。 （１）・・・車、（２）・・・バンパー、（３）・・・
取付板、（４）・・・ホーン、（６）・・・開口部。 代理人　弁理士　石　１）長　上 第１図 第２図 第４図 第８図 第１０図Figures 1 (a) and 1 (b) are explanatory diagrams showing the ultrasonic sensor (-1 state and its detection operation, Figures 2 and 13 are enlarged side views and front views of the same as above, and Figure 4 is an explanatory diagram showing the -1 state and its detection operation. 5 and 6 are longitudinal and horizontal sectional views of the ultrasonic sensor, FIG. 7 is an exploded perspective view of the same, FIG. 8 is a sectional view of the control circuit block, and FIG. 9 is an exploded perspective view of the same. is an exploded perspective view of the same as above, FIG. 10 is a plan view of the rubber plate, FIGS. 11 to 13 are partially enlarged sectional views of the case, rubber plate, and cover, and FIG. 14 (a)
) (b) is an exploded cross-sectional view of a bushing portion for a lead wire and a cross-sectional view of the bushing, FIG. 15 is an exploded cross-sectional view of a bushing portion for a cable wire, and FIG. 16 is a cross-sectional view of the same bushing. (1)...car, (2)...bumper, (3)...
Mounting plate, (4)...horn, (6)...opening. Agent Patent Attorney Ishi 1) Chief Figure 1 Figure 2 Figure 4 Figure 8 Figure 10

Claims (1)

【特許請求の範囲】 ＋１１車のバンパーのような取付板に固定する超倍波セ
ンサーであって、ホーンの前面舎手開口部后長円形に形
成してその短径方向を水平方向に回りで配置し、ホーン
の中心軸の方向を開口側で上ｐきに傾斜させて成ること
を特徴とする超音波をコサ−。 （２）ホーンの前面開口部の縁にフランジを形成し、こ
のフランジを取付ｊム板を介して取付板に始接し、取付
ｊム板の取付板に当接する面にチー戸を形成し、取付板
に固定した取付金具にホーン省部を固定して成る特許請
求の範囲第１項記載の剋音波センサー。 （３）フランジのホーン開口部の短径方向両側にも化リ
プを設け、取付ｊム板に係止りつと係合す請求の範囲第
２項記載の超音波センサー。[Claims] +11 A superharmonic sensor fixed to a mounting plate such as a car bumper, which is formed into an oval shape behind the front opening of the horn and can be rotated horizontally in the short axis direction. The ultrasonic wave generator is characterized in that the direction of the center axis of the horn is tilted upward on the opening side. (2) Forming a flange on the edge of the front opening of the horn, first connecting this flange to the mounting plate via the mounting plate, and forming a flap on the surface of the mounting plate that contacts the mounting plate; The acoustic wave sensor according to claim 1, wherein the horn saving part is fixed to a mounting bracket fixed to a mounting plate. (3) The ultrasonic sensor according to claim 2, wherein a lip is provided on both sides of the horn opening of the flange in the short diameter direction, and is engaged with the mounting plate.
JP59050680A 1984-03-15 1984-03-15 Ultrasonic sensor Pending JPS60194380A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59050680A JPS60194380A (en) 1984-03-15 1984-03-15 Ultrasonic sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59050680A JPS60194380A (en) 1984-03-15 1984-03-15 Ultrasonic sensor

Publications (1)

Publication Number Publication Date
JPS60194380A true JPS60194380A (en) 1985-10-02

Family

ID=12865643

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59050680A Pending JPS60194380A (en) 1984-03-15 1984-03-15 Ultrasonic sensor

Country Status (1)

Country Link
JP (1) JPS60194380A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002237A1 (en) * 1993-07-09 1995-01-19 Gec Marconi Ltd. Acoustic transmitting and receiving unit
EP0837342A1 (en) * 1996-10-15 1998-04-22 Denso Corporation Ultrasonic sensor and obstruction detector having accurate obstruction detection capabilities
KR100808370B1 (en) 2005-12-23 2008-02-27 재단법인 포항산업과학연구원 Ultrasonic sensor in order to have skew directivity according to direction of case's surface
WO2008032982A1 (en) * 2006-09-13 2008-03-20 Hagisonic Co., Ltd. Ultrasonic sensor with different-directional directivities
JP2016033486A (en) * 2014-07-31 2016-03-10 日本セラミック株式会社 Ultrasonic type range finder unit attached to vehicle and safety apparatus using the same
CN111828814A (en) * 2020-08-13 2020-10-27 于浩 Backing radar convenient to maintain

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4876436A (en) * 1972-01-05 1973-10-15
JPS547198A (en) * 1977-06-17 1979-01-19 Matsushita Electric Ind Co Ltd Organic semiconductor
JPS5524640U (en) * 1978-07-31 1980-02-18
JPS5871240A (en) * 1981-10-22 1983-04-27 Toyota Motor Corp Rear monitoring device for car

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4876436A (en) * 1972-01-05 1973-10-15
JPS547198A (en) * 1977-06-17 1979-01-19 Matsushita Electric Ind Co Ltd Organic semiconductor
JPS5524640U (en) * 1978-07-31 1980-02-18
JPS5871240A (en) * 1981-10-22 1983-04-27 Toyota Motor Corp Rear monitoring device for car

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002237A1 (en) * 1993-07-09 1995-01-19 Gec Marconi Ltd. Acoustic transmitting and receiving unit
EP0837342A1 (en) * 1996-10-15 1998-04-22 Denso Corporation Ultrasonic sensor and obstruction detector having accurate obstruction detection capabilities
EP1267176A1 (en) * 1996-10-15 2002-12-18 Denso Corporation Ultrasonic sensor and obstruction detector having accurate obstruction detection capabilities
KR100808370B1 (en) 2005-12-23 2008-02-27 재단법인 포항산업과학연구원 Ultrasonic sensor in order to have skew directivity according to direction of case's surface
WO2008032982A1 (en) * 2006-09-13 2008-03-20 Hagisonic Co., Ltd. Ultrasonic sensor with different-directional directivities
JP2016033486A (en) * 2014-07-31 2016-03-10 日本セラミック株式会社 Ultrasonic type range finder unit attached to vehicle and safety apparatus using the same
CN111828814A (en) * 2020-08-13 2020-10-27 于浩 Backing radar convenient to maintain

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