EP2276583A2 - Antenne acoustique a circuits imprimes integres - Google Patents
Antenne acoustique a circuits imprimes integresInfo
- Publication number
- EP2276583A2 EP2276583A2 EP09750050A EP09750050A EP2276583A2 EP 2276583 A2 EP2276583 A2 EP 2276583A2 EP 09750050 A EP09750050 A EP 09750050A EP 09750050 A EP09750050 A EP 09750050A EP 2276583 A2 EP2276583 A2 EP 2276583A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- transducers
- printed circuit
- elementary
- transducer
- acoustic
- 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.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 24
- 239000004020 conductor Substances 0.000 description 10
- 238000003466 welding Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000026683 transduction Effects 0.000 description 1
- 238000010361 transduction Methods 0.000 description 1
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 schematically shows such a type transducer
- Tonpilz It essentially comprises a stack 1 of piezoelectric ceramic discs (or electrostrictive effect) clamped between a thick disc 2 forming a counter-mass 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 FIG. 1 assures a very particular role: the driving function is provided by the pillar 1 of piezoelectric ceramics electrically interconnected by electrodes 1A formed on their planar faces facing each other. Ceramics are wired in parallel.
- Pavilion 3 provides acoustic coupling with the medium and also allows the band to expand by its own mode of "fluttering". 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 be carried out is therefore very rapidly rhédibitoire for high frequency antennas (greater than 5OkHz), composed of a large number of small transducers, for example, and not limited to, 128 elementary transducers at 15OkHz .
- This cabling, welding and marking station which is very difficult to automate, proves to be very often in practice the heaviest post in the process of mounting an acoustic antenna
- 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.
- FIG. 1 is a view in simplified section of a prior art "Tonpilz" type antenna element
- FIG. 2 is a sectional view of an elementary transducer mounted on a printed circuit
- FIGS. 7 are respectively perspective representations in top view, front view and perspective view from below, in bottom view and in plan view of an exemplary embodiment, according to the present invention, of a printed circuit bearing eight elementary transducers, the printed circuit tracks being schematically and partially shown
- FIG. 8 is a partial perspective top view of the printed circuit and the transducers of a 64-transducer antenna according to the invention.
- 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.
- FIG. 2 shows an elementary transducer 6 according to the invention and fixed on a printed circuit 7.
- the insulating material of the printed circuit is chosen as a function of the characteristics of the transducers used, for example, and non-limiting, 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 1 1 passing through a hole in this printed circuit: the counter-mass 10 is applied to one face of the printed circuit, while the ceramic 8 is applied to the other face of this circuit, and the horn 9 is applied to the free planar face of the ceramic 8.
- the screw 1 1 (screw assembly and prestressing) thus freely traverses the elements 10, 7, and 8 and is screwed into a threaded axial bore of the roof 9.
- the common axis of all these elements is referenced 12.
- a large number (about one 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 close to the transducer 6.
- the implantation topology different transducers on the printed circuit 7 is determined in a manner known per se in order 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 1 1 electrically connects the flag to the counterweight, and the counterweight is in direct contact with the printed circuit 7.
- the screw 1 1 is electrically insulated from the ceramic with a sheath (not shown) , plastic for example.
- FIGS. 3 to 7 show an embodiment of an antenna 14 (without its protective case) according to the invention with only eight transducers, referenced as a whole, but it is well understood that in reality, an antenna generally has a greater number of transducers, for example 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 that their arrangement on the printed circuit supporting them is function, in a manner known per se, the 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 part surrounding the fixing bore of the transducer, ensuring contact with a first electrode. front of the corresponding ceramic, and extending by a filiform portion extending to a zone 18A where these conductors 17 are connected through the plate 16, in a zone 18B (opposite the zone 18A) from the lower face of the plate 16 to sections of conductors 19 whose ends are welded to a connector (not shown, of which only the trace 20 has been shown on the plate 16).
- Conductors 21 are printed on the underside of the plate 16.
- the antenna 23 shown in FIG. 8 essentially comprises a printed circuit board 24 on which 64 transducers referenced 25 as a whole are fixed. 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 box have not been shown either.
- the advantages of the present invention are of five types: 1 - Easy assembly of tonpilz stacking / clamping type.
- 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 theorem of
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
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 true EP2276583A2 (fr) | 2011-01-26 |
EP2276583B1 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 (fr) |
EP (1) | EP2276583B1 (fr) |
JP (1) | JP5723765B2 (fr) |
DK (1) | DK2276583T3 (fr) |
FR (1) | FR2931016B1 (fr) |
WO (1) | WO2009141569A2 (fr) |
Family Cites Families (11)
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 (fr) * | 1986-10-29 | 1993-06-15 | ||
JP2001526006A (ja) * | 1996-05-09 | 2001-12-11 | クレスト・ウルトラソニックス・コーポレーション | 超音波トランスデューサ |
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 DK DK09750050.8T patent/DK2276583T3/en active
- 2009-05-06 WO PCT/FR2009/050842 patent/WO2009141569A2/fr active Application Filing
- 2009-05-06 JP JP2011507975A patent/JP5723765B2/ja active Active
- 2009-05-06 EP EP09750050.8A patent/EP2276583B1/fr active Active
- 2009-05-06 US US12/991,033 patent/US9114427B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2009141569A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009141569A2 (fr) | 2009-11-26 |
FR2931016B1 (fr) | 2010-08-13 |
WO2009141569A3 (fr) | 2010-03-11 |
JP5723765B2 (ja) | 2015-05-27 |
US20110051969A1 (en) | 2011-03-03 |
EP2276583B1 (fr) | 2015-08-26 |
JP2011520374A (ja) | 2011-07-14 |
FR2931016A1 (fr) | 2009-11-13 |
US9114427B2 (en) | 2015-08-25 |
DK2276583T3 (en) | 2015-11-16 |
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