EP2568469A1 - Bloc à ultrasons et capteur d'ultrasons - Google Patents

Bloc à ultrasons et capteur d'ultrasons Download PDF

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Publication number
EP2568469A1
EP2568469A1 EP11007354A EP11007354A EP2568469A1 EP 2568469 A1 EP2568469 A1 EP 2568469A1 EP 11007354 A EP11007354 A EP 11007354A EP 11007354 A EP11007354 A EP 11007354A EP 2568469 A1 EP2568469 A1 EP 2568469A1
Authority
EP
European Patent Office
Prior art keywords
ultrasonic
sound
assembly
sound conductor
ultrasound
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.)
Withdrawn
Application number
EP11007354A
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German (de)
English (en)
Inventor
Klaus Dörr
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.)
Pepperl and Fuchs SE
Original Assignee
Pepperl and Fuchs SE
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 Pepperl and Fuchs SE filed Critical Pepperl and Fuchs SE
Priority to EP11007354A priority Critical patent/EP2568469A1/fr
Publication of EP2568469A1 publication Critical patent/EP2568469A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
    • 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/28—Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors

Definitions

  • the present invention relates to an ultrasonic assembly according to the preamble of claim 1.
  • a printed circuit board is present, to which at least one ultrasonic transducer for emitting and / or receiving ultrasonic waves and electronic means for driving the ultrasonic transducer and / or for processing ultrasonic waves, which are detected by the ultrasonic transducer, are arranged.
  • the first ultrasonic assembly is designed as an ultrasonic transmitter and the second as an ultrasonic receiver. Between them, a surveillance area is spanned, in which objects, such as labels or paper sheets, can be detected.
  • objects such as labels or paper sheets
  • double sheets ie two paper, cardboard or plastic sheets lying on top of each other, should be distinguished from individual sheets.
  • the problem of the large height is further exacerbated when a measuring section between the two ultrasonic transducers of the ultrasonic assemblies is to run inclined.
  • a measuring section between the two ultrasonic transducers of the ultrasonic assemblies is to run inclined.
  • the ultrasonic transducer and / or the printed circuit boards on which the ultrasonic transducers are mounted usually inclined, whereby the space requirement of the ultrasonic assemblies in the direction of connection of the two ultrasonic assemblies is additionally increased.
  • an object of the invention can be considered to provide an ultrasonic assembly, which has a particularly low height with a simple structure.
  • a tubular sound conductor with an inner cavity, in which ultrasonic waves are conducted is present for conducting ultrasonic waves to the ultrasonic transducer and / or away from the ultrasonic transducer, and that a sound reflector is provided for deflecting from ultrasonic waves to the sound conductor and / or away from the sound conductor.
  • the invention is based on the finding that in a region in which the space requirement of the ultrasound assembly should be minimal, then smaller heights can be achieved, if in this area only a tubular sound conductor and a sound reflector, but not an ultrasonic transducer with an associated circuit board are located.
  • the tubular sound conductor and the sound reflector allow particularly small designs, so that the height of the ultrasonic assembly can be reduced.
  • the height be defined in a direction perpendicular to a longitudinal direction of the tubular sound conductor.
  • the height of the ultrasonic assembly according to the invention does not or hardly depends on the height of the ultrasonic transducer. Its height, that is to say the extent in its main emission and / or main reception direction, is oriented in the direction of the longitudinal direction of the tubular sound conductor and thus does not or only barely influences the expansion of the ultrasonic assembly in a direction transverse thereto.
  • the tubular sound conductor may be arranged such that ultrasonic waves radiated from the ultrasonic transducer pass directly into the tubular sound conductor and / or that ultrasonic waves coming from a monitoring area pass directly through the tubular sound conductor onto the ultrasonic transducer. Thus, no deflection of the ultrasonic waves between the ultrasonic transducer and the tubular sound conductor is required.
  • the tubular sound conductor is also referred to as a sound conductor in the following.
  • the sound conductor is arranged so that a longitudinal axis of the tubular sound conductor is transverse to the circuit board.
  • the sound conductor can be exactly one tube, which is linear, ie without bends, runs.
  • a particularly low height is made possible and accomplished an efficient sound conduction within the tubular sound conductor.
  • ultrasonic waves between the ultrasonic transducer and the sound reflector can run directly through this linear tube shape, without the need for further means of redirecting the ultrasound.
  • the size of a cross-sectional area of the internal cavity of the sound conductor in a region towards the ultrasound transducer corresponds to the size of a cross-sectional area of the ultrasound transducer.
  • the cross-sectional areas may be exactly the same or the cross-sectional area of the inner cavity is slight, for example up to 20%, larger than the cross-sectional area of the ultrasonic transducer.
  • the space requirement of the ultrasonic module should be particularly low in the area of the sound reflector.
  • a cross-sectional area of the sound conductor tapers from the ultrasound transducer to the sound reflector.
  • the cross-sectional area of the sound conductor to the sound reflector can be smaller than the cross-sectional area of the ultrasonic transducer.
  • the sound conductor to the ultrasonic transducer towards a molded part the cross-section of which tapers towards the sound reflector.
  • a tapered shape can be achieved in a particularly simple manner.
  • a sealing envelope of the ultrasonic transducer can be realized. It can be provided that a residual region of the sound conductor, which is located between the molded part and the sound reflector, is designed with a constant cross-sectional area.
  • a piece of tubing can be used as a molded part.
  • This can for example be made of plastic, at least of a flexible material.
  • the piece of tubing may be a shrink tubing. With such pieces of tubing, a tapered shape and a precisely fitting connection can be achieved in a simple manner.
  • a cross section of the tubular sound conductor is roundish, in particular oval.
  • the tubular sound conductor has a plastic tube or is formed by a plastic tube.
  • a preferred embodiment of the ultrasonic assembly according to the invention is characterized in that the sound reflector is a hollow reflector.
  • This can be understood to mean a sound reflector with a concave, in particular spherical or parabolic, reflection surface.
  • a focusing of the ultrasonic waves is possible.
  • a reflection surface of the sound reflector is oriented at an angle of inclination not equal to 45 ° to the longitudinal axis of the sound conductor.
  • a wall of the sound conductor has, in addition to the sound reflector, an opening for the passage of ultrasound waves between the sound reflector and a monitoring area.
  • this wall completely envelops the internal cavity of the sound conductor between the ultrasonic transducer and the sound reflector.
  • the size of the opening in the wall can be roughly correspond to the cross-sectional area of the sound reflector.
  • Ultrasonic waves that are to be deflected with the sound reflector thus can pass through the opening unhindered, while ultrasonic waves, for example, come from an object outside the surveillance area, are intercepted by the wall of the sound conductor and not reach the sound reflector.
  • the opening is covered by a sound-transparent film, which reduces the penetration of dust and dirt particles in the inner cavity.
  • a single ultrasound assembly can serve as a measuring device, which is then set up both for transmitting ultrasonic waves and for receiving reflected ultrasound waves.
  • At least the ultrasonic transmitter or the ultrasonic receiver is thus designed according to the invention with a tubular sound conductor and a sound reflector.
  • one of the two ultrasound assemblies can be designed in a conventional manner as a generic ultrasound assembly described above. Since low losses are generally associated with a sound conductor and a sound reflector, it may be advantageous if only one of the two ultrasonic assemblies is an ultrasonic assembly according to the invention. It has been found to be expedient if the ultrasonic transmitter is formed as an ultrasonic assembly according to the invention.
  • both ultrasonic assemblies each have a sound conductor and a sound reflector, wherein these components may be formed as described above. It can be provided that only one of the ultrasonic assemblies has a printed circuit board and / or electronic means. In this case, the electronic means control, for example via a cable, also the ultrasonic transducer of the other ultrasonic assembly. This is advantageous in terms of cost and space requirements.
  • both the first and the second ultrasound assembly may each be an ultrasound assembly according to the invention. In this way, a particularly compact design of the ultrasonic sensor according to the invention can be achieved.
  • the monitoring area here is a measuring section between the sound reflector of the first ultrasonic module and the sound reflector of the second ultrasonic module.
  • the space requirement of the ultrasonic sensor in the direction of the measuring section is crucial.
  • the ultrasound transducers and the printed circuit boards of the two ultrasound assemblies are arranged outside this measuring path, so that their size does not or only barely affect the space requirement in the direction of the measuring path.
  • a cost-effective production is achieved in a preferred embodiment of the ultrasonic sensor according to the invention, in which the circuit board of the first ultrasonic assembly and the circuit board of the second ultrasonic assembly are formed by a common circuit board. The effort for mounting the two ultrasonic transducers on the circuit board and the wiring of the circuit board is thereby reduced.
  • the sound conductor of the first ultrasonic assembly and the sound conductor of the second ultrasonic assembly are arranged parallel to each other.
  • this achieves a space-saving and easy-to-manufacture design.
  • a further preferred embodiment of the ultrasonic sensor according to the invention is characterized in that for aligning the first ultrasonic assembly on the second ultrasonic assembly, the reflection surface of the sound reflector of the first ultrasonic assembly is disposed at an inclination angle between 20 ° and 40 ° to the longitudinal axis of the sound conductor of the first ultrasonic assembly and the Reflection surface of the sound reflector of the second ultrasonic assembly is disposed at an inclination angle between 50 ° and 70 ° to the longitudinal axis of the sound conductor of the second ultrasonic assembly. Reflections of ultrasonic waves on objects in the surveillance area, for example on paper sheets, advantageously do not hit the sound reflectors here.
  • the two ultrasonic modules be understood as aligned with each other when ultrasonic waves emitted from the first ultrasonic assembly can be detected by the second ultrasonic assembly.
  • Fig. 1 does not show to scale a first embodiment of an ultrasonic sensor 120 according to the invention.
  • first ultrasound assembly 100A is an ultrasound transmitter and the second ultrasound assembly 110 is an ultrasound receiver.
  • the invention also includes embodiments in which the first ultrasound assembly 100A is designed as an ultrasound receiver and the second ultrasound assembly 110 as an ultrasound transmitter.
  • a monitoring area 90 is formed between the two ultrasonic assemblies 100A, 110. Objects in the monitoring area 90 influence the ultrasonic waves transmitted from the ultrasonic transmitter 100A to the ultrasonic receiver 110, and thus can be identified by an evaluation device, not shown.
  • the first ultrasonic assembly 100A has a printed circuit board 10A to which an ultrasonic transducer 20A and electronic means 30A adapted to operate Ultrasonic transducer 20A to send out ultrasonic waves to drive, are attached.
  • a sound conductor 50A and a sound reflector 60A are provided.
  • the sound conductor 50A is attached to the circuit board 10A and encloses with it the ultrasonic transducer 20A. Thereby, ultrasonic waves emitted from the ultrasonic transducer 20A are guided in an inner cavity 54A of the sound conductor 50A in the direction of the arrow 22. Then, the ultrasonic waves hit the sound reflector 60A, which is arranged in the illustrated embodiment within the sound conductor 50A.
  • the sound reflector 60A may be formed by a wall of the sound conductor 50A.
  • the sound reflector 60A has a reflection surface whose surface normal is at an inclination angle ⁇ to a longitudinal direction of the sound conductor 50A.
  • Ultrasonic waves reflected at the reflecting surface of the sound reflector 60A leave the internal cavity 54A of the sound conductor 50A through an opening 56A in a wall 52A of the sound conductor 50A.
  • the opening 56A is disposed adjacent the sound reflector 60A in the direction of the reflected ultrasonic waves, and the size of the opening 56A may correspond to the reflection area of the sound reflector 60A.
  • the ultrasonic waves emerging through the opening 56A pass through the monitoring area 90 in the direction of the arrow 24 to the second ultrasonic unit 110.
  • This path can also be referred to as a measuring path.
  • the measurement path may be inclined with respect to the longitudinal direction of the sound conductor 50A.
  • the height H of that portion of the ultrasonic assembly 100A which adjoins the monitoring area should be as small as possible.
  • the second ultrasonic assembly 110 also has a printed circuit board 10B, an ultrasonic transducer 20B, and electronic means 30B.
  • the ultrasonic transducer 20B and the electronic means 30B are arranged to detect ultrasonic waves.
  • the ultrasound transducer 20B delimits the monitoring region 90.
  • the ultrasound transducer 20B and the circuit board 20B the smallest possible heights are about 10 mm to 15 mm.
  • the overall height H which is essentially determined by the diameter of the sound conductor 50A in the region of the sound reflector 50A, can be less than 7 mm.
  • Fig. 2 schematically shows a second embodiment of an ultrasonic sensor according to the invention 120.
  • This has two ultrasonic assemblies according to the invention 100A, 100B, one of which is designed as an ultrasonic transmitter 100A and the other as an ultrasonic receiver 100B.
  • a common printed circuit board 10 and common electronic means 30 arranged on the printed circuit board are provided for both ultrasonic assemblies 100A, 100B.
  • both ultrasonic transducers 20A, 20B are mounted on the circuit board 10.
  • Components of the second ultrasound assembly 100B that are equivalent to those of the first ultrasound assembly 100A are identified by reference numerals formed by a "B" instead of an "A".
  • the descriptions of the respective components of the first ultrasonic assembly 100A apply.
  • the sound reflector 60A of the first ultrasonic assembly 100A is aligned with the sound reflector 60B of the second ultrasonic assembly 100B.
  • the sound reflector 60B is at an inclination angle ⁇ , which is greater than 45 ° and in the example shown is 60 °.
  • both ultrasonic assemblies 100A, 100B are designed with a tubular sound conductor and a sound reflector, particularly low heights can be achieved.
  • FIG Fig. 3 A further exemplary embodiment of an ultrasound sensor 120 according to the invention is shown schematically in FIG Fig. 3 shown.
  • an ultrasound assembly 100A according to the invention is likewise present, which is designed as an ultrasound transmitter or ultrasound receiver and, like the ultrasound assembly 100A, consists of Fig. 2 can be executed.
  • a second ultrasonic assembly 100B which in turn has a sound conductor 50B and a sound reflector 60B. These components may look like the components with the same reference numerals Fig. 2 be formed. In contrast to Fig. 2 however, here the second ultrasonic assembly 100B has no electronic means.
  • the ultrasonic transducer 20B of the second ultrasonic assembly 100B is driven by the electronic means 30 of the first ultrasonic assembly 100A, for example, via a cable 70.
  • the second ultrasonic assembly 100B does not need a printed circuit board either.
  • the ultrasonic transducer 20B may be attached to a wall 72 of the sound conductor 50B or to a housing that is sound-decoupled from the walls 52B of the sound conductor 50B.
  • this allows a smaller design of the printed circuit board 10.
  • a cost reduction and a reduction of the space requirement of the ultrasonic sensor 120 can be achieved.
  • a variation of the distance between the two ultrasonic assemblies, in particular at the site possible.
  • suitable material transitions 74 may be present.
  • the ultrasound assembly according to the invention and the ultrasound sensor according to the invention can advantageously also be used in applications in which the available space is very limited.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
EP11007354A 2011-09-09 2011-09-09 Bloc à ultrasons et capteur d'ultrasons Withdrawn EP2568469A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11007354A EP2568469A1 (fr) 2011-09-09 2011-09-09 Bloc à ultrasons et capteur d'ultrasons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11007354A EP2568469A1 (fr) 2011-09-09 2011-09-09 Bloc à ultrasons et capteur d'ultrasons

Publications (1)

Publication Number Publication Date
EP2568469A1 true EP2568469A1 (fr) 2013-03-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11007354A Withdrawn EP2568469A1 (fr) 2011-09-09 2011-09-09 Bloc à ultrasons et capteur d'ultrasons

Country Status (1)

Country Link
EP (1) EP2568469A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170146653A1 (en) * 2015-11-24 2017-05-25 Schneider Electric Industries Sas Ultrasonic detection system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1269922B (de) * 1961-08-04 1968-06-06 Licentia Gmbh Gehaeuse fuer Ultraschallschrankeneinrichtung
US4433398A (en) * 1980-08-25 1984-02-21 Nippon Soken, Inc. Ultrasonic transducer
DE8531180U1 (de) * 1985-11-05 1986-03-13 Vogel, Karl-Heinz, 5500 Trier Aufsteckbare Umlenkvorrichtung für Ultraschallwandler
US4580251A (en) * 1983-11-09 1986-04-01 Honeywell Inc. Ultrasonic distance sensor
WO1992020154A1 (fr) * 1991-04-26 1992-11-12 Daimler-Benz Aktiengesellschaft Barrage photoelectrique a fourche
US5289436A (en) * 1992-10-22 1994-02-22 General Electric Company Ultrasonic waveguide
DE102007039598A1 (de) * 2006-09-05 2008-04-03 Denso Corp., Kariya Ultraschallsensor und Hindernis-Detektorvorrichtung
DE202009012517U1 (de) * 2009-09-15 2009-12-24 Leuze Electronic Gmbh + Co. Kg Sensor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1269922B (de) * 1961-08-04 1968-06-06 Licentia Gmbh Gehaeuse fuer Ultraschallschrankeneinrichtung
US4433398A (en) * 1980-08-25 1984-02-21 Nippon Soken, Inc. Ultrasonic transducer
US4580251A (en) * 1983-11-09 1986-04-01 Honeywell Inc. Ultrasonic distance sensor
DE8531180U1 (de) * 1985-11-05 1986-03-13 Vogel, Karl-Heinz, 5500 Trier Aufsteckbare Umlenkvorrichtung für Ultraschallwandler
WO1992020154A1 (fr) * 1991-04-26 1992-11-12 Daimler-Benz Aktiengesellschaft Barrage photoelectrique a fourche
US5289436A (en) * 1992-10-22 1994-02-22 General Electric Company Ultrasonic waveguide
DE102007039598A1 (de) * 2006-09-05 2008-04-03 Denso Corp., Kariya Ultraschallsensor und Hindernis-Detektorvorrichtung
DE202009012517U1 (de) * 2009-09-15 2009-12-24 Leuze Electronic Gmbh + Co. Kg Sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170146653A1 (en) * 2015-11-24 2017-05-25 Schneider Electric Industries Sas Ultrasonic detection system
EP3173345A1 (fr) 2015-11-24 2017-05-31 Schneider Electric Industries SAS Système de détection par ultrason
US10228461B2 (en) * 2015-11-24 2019-03-12 Schneider Electric Industries Sas Ultrasonic detection system

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