EP2276583B1 - Antenne acoustique a circuits imprimes integres - Google Patents

Antenne acoustique a circuits imprimes integres Download PDF

Info

Publication number: EP2276583B1
Authority: EP; European Patent Office
Prior art keywords: transducers; printed circuit; acoustic; antenna; elementary
Prior art date: 2008-05-07
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.): Active

Application number

EP09750050.8A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP2276583A2 (fr

Inventor

Gilles Grosso

Frédéric MOSCA

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.)

iXBlue SAS

Original Assignee

iXBlue SAS

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.)

2008-05-07

Filing date

2009-05-06

Publication date

2015-08-26

2009-05-06 Application filed by iXBlue SAS filed Critical iXBlue SAS

2011-01-26 Publication of EP2276583A2 publication Critical patent/EP2276583A2/fr

2015-08-26 Application granted granted Critical

2015-08-26 Publication of EP2276583B1 publication Critical patent/EP2276583B1/fr

Status Active legal-status Critical Current

2029-05-06 Anticipated expiration legal-status Critical

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Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
- B06B1/0629—Square array

Definitions

the present invention relates to an integrated printed circuit acoustic antenna, and in particular to a low cost acoustic antenna.
the acoustic transduction technology conventionally used in underwater applications and having the best compromise between radiated sound power and usable bandwidth is "Tonpilz”.
This system is an electro-acoustic converter of mass-spring-mass type with symmetry of revolution functioning generally in dilation / compression.
FIG 1 such a Tonpilz type transducer. It essentially comprises a stack 1 of piezoelectric ceramic discs (or electrostrictive) clamped between a thick disc 2 forming a counterweight and a disc 3 less thick than the disk 2 and flag. All these discs are pierced with a central opening allowing the passage of a clamping rod 4 which ensures their tightening with a nut 5.
each of the elements represented in figure 1 ensures a very particular role: the driving function is provided by the pillar 1 of piezoelectric ceramics electrically interconnected by electrodes 1A formed on their flat faces vis-à-vis. The ceramics are wired in parallel.
the flag 3 ensures the acoustic coupling with the medium and also makes it possible to widen the band by clean mode known as "papillonnage". It is he who determines the geometry of the radiated field (directivity diagram).
Countermass 2 stabilizes the system and channels the radiated energy in a single direction of space.
the prestressing rod 4 and the clamping nut 5 guarantee the operation of the device (transducer) in expansion / compression.
the amount of wiring by welding to achieve is very quickly rhédibitoire for high frequency antennas (greater than 50kHz), composed of a large number of small transducers, for example, and not limited to, 128 elementary transducers 150kHz .
This cabling, welding and tracking station which is very difficult to automate, is very often in practice the heavier workstation in the process of mounting an acoustic antenna.
An acoustic antenna comprising a network of elementary transducers mounted on a printed circuit is presented in the document US 6,181,052 B1 .
the present invention relates to a low cost acoustic antenna requiring the minimum possible assembly operations, these operations can be easily automated.
the term "acoustic" is used here, but it is understood that the operating frequency band of the antenna of the invention may be greater than and even substantially greater than the sound frequencies; it may range for example from 20 kHz to several hundred kHz, and typically, but not exclusively, it may be the 140-160 kHz frequency band.
the acoustic antenna according to the invention is characterized in that it comprises a network of elementary transducers, each elementary transducer comprising, between a counter-mass and a horn, at least one ceramic, all the elementary transducers being mounted on a common printed circuit for electrical connection between the transducers and for positioning the transducers relative to one another, and at least one connector fixed on this printed circuit, each of the transducers being mounted so that the printed circuit is clamped between his (its) ceramics (s) and its counter-mass.
the elementary transducers are of one of the following electro-acoustic types: piezoelectric or electrostrictive.
An object of the present invention consists in eliminating, during the manufacturing process, the positioning stations of the transducers on their support and the welding of their connection electrodes (transducer supply wires) of the manufacturing process of the tonpilz type antennas to high frequency with a large number of elements.
the invention provides, according to a preferred embodiment, to reduce the ceramic pillar of Tonpilz to a single ceramic and fix the various pillars on a printed circuit common to the entire antenna in the tonpilz structure, between the ceramic and the countermeasures, to ensure the electrical connection of all elements of the antenna and to fix stably the arrangement of the transducers relative to each other. It is understood that the invention is not limited to single ceramic transducers, and that these transducers may include more.
the insulating material of the printed circuit is chosen according to the characteristics of the transducers used, for example, and without limitation, this material may be epoxy glass or any screen-printing medium.
the transducer 6 essentially comprises a tubular ceramic 8, a horn 9 These three elements 8 to 10 are assembled in the following manner on the printed circuit 7 by means of a screw 11 passing through a hole in this printed circuit: the counter-mass 10 is applied on one side of the printed circuit, while the ceramic 8 is applied on the other side of this circuit, and the horn 9 is applied on the free planar face of the ceramic 8.
the screw 11 thus freely traverses the elements 10, 7, and 8 and is screwed into a threaded axial bore of the horn 9.
the common axis of all these elements is referenced 12.
a large number (a hundred or more) other transducers can be fixed on the printed circuit 7, and by way of example, there is shown a bore 13 formed in this printed circuit for fixing a transducer neighbor transducer 6.
the topology of implantation of different transducers on the printed circuit 7 e st determined in a manner known per se to obtain a desired radiation pattern and, if necessary, to be able to implement a beam formation and orientation system.
the electrical connections are ensured in the following way.
the printed circuit 7 recovers each of the positive and negative points of the transducer on its two main faces.
the positive connection is obtained by the direct contact of a plane face of the ceramic on the printed circuit 7.
the negative connection is obtained indirectly: the other flat face of the ceramic is in direct contact with the horn (electrically conductive ), and the screw 11 electrically connects the horn to the counterweight, and the counterweight is in direct contact with the printed circuit 7.
the screw 11 is electrically insulated from the ceramic with a sheath (not shown), in plastic material for example.
the topography of the conductors formed on the printed circuit board 7 and from the transducers is optimized and these conductors are connected to a connector (not shown) fixed on the printed circuit.
These conductors convey the excitation energy of the transmission channels from the power electronics and control devices (not shown), and in the reception phase, they convey the signals to the electronic processing circuits (not shown).
an antenna 14 (without its protective case) according to the invention with only eight transducers, referenced as a whole, but it is understood that in reality, an antenna generally comprises a larger number at least 64.
These transducers 15 have been shown in alignment, but it is also understood that in reality, they are not necessarily aligned, and their arrangement on the printed circuit supporting them is functionally, so known per se, characteristics of the acoustic beam to obtain.
the transducers 15 are fixed on a plate 16 on which are printed electrical connection conductors between the different transducers and a connector (Not shown) providing, with another connector (not shown either) the connection with appropriate reception and signal processing circuits, well known per se and not described here.
the conductors 17 printed on the upper face of the plate 16 each comprise a circular portion surrounding the fixing bore of the transducer, ensuring contact with a first front electrode of the corresponding ceramic, and extending by a filiform portion extending to a zone 18A where these conductors 17 are connected to through the plate 16, in a zone 18B (opposite the zone 18A) of the lower face of the plate 16, to sections of conductors 19 whose ends are welded to a connector (not shown, of which one has only shown the trace 20 on the plate 16).
Conductors 21 are printed on the underside of the plate 16.
the antenna 23 represented in figure 8 essentially comprises a printed circuit board 24 on which are fixed 64 transducers referenced 25 as a whole. Four connectors (of which only two, referenced 26, 27 are visible in the figure) are fixed on the plate 24.
the printed circuit 24 is of the double-sided type, and therefore only sees in the figure the tracks 28 printed on one of them. his faces.
the assembly is fixed in a sealed housing (not shown). Similarly, the electronic circuits (preamplification, amplification, pretreatment, ...) that can be included in this package have not been shown either.
the cross-talking vibratory couplings that can appear via the printed circuit are minimized by optimization of the operation by the finite element method, by optimizing the mass of each element of each transducer, in particular the against the masses (10), so as to bring the nodal point of vibration of the structure to the printed circuit board in order to reduce as much as possible the deformation of the latter and the possible minute displacements of the transducers on their support plate (generally, the transducer fixing rod on the printed circuit board is much more elastic than the ceramic, and the prestress it exerts on the transducer is not sufficient to clamp it, but is sufficient to ensure the electrical contact between the elements of the transducers and the printed circuit).
the structure of each transducer is represented as a mesh of small volume elements in which each of the acoustic quantities is calculated, knowing the initial conditions and the boundary conditions and applying the Kirchhoff theorem.

Landscapes

Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Transducers For Ultrasonic Waves (AREA)
Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Waveguide Aerials (AREA)
Variable-Direction Aerials And Aerial Arrays (AREA)

EP09750050.8A 2008-05-07 2009-05-06 Antenne acoustique a circuits imprimes integres Active EP2276583B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR0802548A FR2931016B1 (fr)	2008-05-07	2008-05-07	Antenne acoustique a circuits imprimes integres
PCT/FR2009/050842 WO2009141569A2 (fr)	2008-05-07	2009-05-06	Antenne acoustique a circuits imprimes integres

Publications (2)

Publication Number	Publication Date
EP2276583A2 EP2276583A2 (fr)	2011-01-26
EP2276583B1 true EP2276583B1 (fr)	2015-08-26

Family

ID=40090003

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP09750050.8A Active EP2276583B1 (fr)	2008-05-07	2009-05-06	Antenne acoustique a circuits imprimes integres

Country Status (6)

Country	Link
US (1)	US9114427B2 (da)
EP (1)	EP2276583B1 (da)
JP (1)	JP5723765B2 (da)
DK (1)	DK2276583T3 (da)
FR (1)	FR2931016B1 (da)
WO (1)	WO2009141569A2 (da)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3370186A (en) *	1965-02-05	1968-02-20	Blackstone Corp	Ultrasonic transducers
US3739327A (en) *	1970-12-16	1973-06-12	Dynamics Corp Massa Div	Electroacoustic transducers of the mass loaded vibratile piston type
JPS513886A (ja) *	1974-06-29	1976-01-13	Nippon Electric Co	Itsutankoteitategatashindoshi
US4373143A (en) *	1980-10-03	1983-02-08	The United States Of America As Represented By The Secretary Of The Navy	Parametric dual mode transducer
US6016821A (en) *	1996-09-24	2000-01-25	Puskas; William L.	Systems and methods for ultrasonically processing delicate parts
US4545041A (en) *	1982-10-27	1985-10-01	The United States Of America As Represented By The Secretary Of The Navy	Shock-hardened hydrophone
JPS59101593U (ja) *	1982-12-24	1984-07-09	日本電気株式会社	振動子配列構造体
JPH0523268Y2 (da) *	1986-10-29	1993-06-15
US5998908A (en) *	1996-05-09	1999-12-07	Crest Ultrasonics Corp.	Transducer assembly having ceramic structure
DE19620133C2 (de) *	1996-05-18	2001-09-13	Endress Hauser Gmbh Co	Schall- oder Ultraschallsensor
JP3961903B2 (ja) *	2002-08-21	2007-08-22	古野電気株式会社	超音波振動子

2008
- 2008-05-07 FR FR0802548A patent/FR2931016B1/fr active Active
2009
- 2009-05-06 WO PCT/FR2009/050842 patent/WO2009141569A2/fr not_active Ceased
- 2009-05-06 EP EP09750050.8A patent/EP2276583B1/fr active Active
- 2009-05-06 US US12/991,033 patent/US9114427B2/en active Active
- 2009-05-06 JP JP2011507975A patent/JP5723765B2/ja active Active
- 2009-05-06 DK DK09750050.8T patent/DK2276583T3/da active

Also Published As

Publication number	Publication date
WO2009141569A2 (fr)	2009-11-26
FR2931016A1 (fr)	2009-11-13
JP5723765B2 (ja)	2015-05-27
JP2011520374A (ja)	2011-07-14
WO2009141569A3 (fr)	2010-03-11
US20110051969A1 (en)	2011-03-03
EP2276583A2 (fr)	2011-01-26
DK2276583T3 (da)	2015-11-16
FR2931016B1 (fr)	2010-08-13
US9114427B2 (en)	2015-08-25

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