EP1005693A2 - Ultrasonic converter with a board for an electric circuit arranged in the longitudinal direction of the converter - Google Patents
Ultrasonic converter with a board for an electric circuit arranged in the longitudinal direction of the converterInfo
- Publication number
- EP1005693A2 EP1005693A2 EP98948834A EP98948834A EP1005693A2 EP 1005693 A2 EP1005693 A2 EP 1005693A2 EP 98948834 A EP98948834 A EP 98948834A EP 98948834 A EP98948834 A EP 98948834A EP 1005693 A2 EP1005693 A2 EP 1005693A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ultrasonic transducer
- housing
- circuit board
- transducer according
- contacts
- 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
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
- G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
Definitions
- Ultrasonic transducer with a circuit board arranged in the longitudinal direction of the transducer for an electrical circuit
- the invention relates to an ultrasonic transducer, in particular for a distance warning system in motor vehicles. Warning systems of this type are used to report obstacles in the vehicle's surroundings that are not recognizable to the driver, and thus to assist the driver in parking and maneuvering operations. Due to the increasingly scarce parking space, there is a growing need for such parking assistance systems, in which several ultrasonic transducers are usually attached to the rear and front bumpers. Since such parking assistance systems are also to be used for less expensive vehicle types, it is desirable to simplify the construction and the ease of installation of the ultrasonic transducers. The basic structure of such ultrasonic transducers is described for example in DE-OS 38 26 799. The invention is therefore based on an ultrasonic transducer as it results from the features of the preamble of claim 1.
- the object is achieved by the features of the characterizing part according to claim 1.
- the invention therefore consists in principle in that the circuit board carrying the electronic circuit (often referred to as circuit board) is no longer used in the usual manner transversely to the longitudinal direction of the housing, but essentially in Insert the longitudinal direction of the converter.
- circuit board carrying the electronic circuit
- These training opportunities consist in particular in a greatly simplified connection technology of the assemblies within the transducer, in a simplified assembly of the transducer with its assemblies and components, and in a greatly simplified connection technology of the transducer itself, and in an improved position stabilization of the transducer within the housing.
- a simplified assembly results from the fact that the circuit board can be inserted into the converter housing in the longitudinal direction.
- the circuit board now extends in the direction of the first and second connecting lines, so that on the one hand the length of the connecting lines is shortened and on the other hand the connecting lines no longer have to be curved as much.
- the board itself now forms a section of the connection between the piezo crystal and the external connections of the transducer.
- the improvement at this point is to provide a detachable electrical connection instead of individual connecting wires to be connected via solder connection, so that both the measuring processes and the connection of the housing-side connector plug can be electrically connected to the circuit board in a simple manner.
- the second connecting lines are formed by resilient contact arms extending in the longitudinal direction of the housing, so that, in other words, the plug pins also the form second connecting lines.
- the contact arms can be partially encapsulated with the housing, but need not be. It is also sufficient if they are inserted into corresponding recesses and guided by them.
- the spring arms are then designed to be resilient in order to ensure permanent contact even with slight changes in the position of the circuit board.
- the contact springs ensure a pre-tension on the circuit board, which they also hold mechanically in the specified position.
- the combination of features according to claim 4 is recommended in a further development.
- the printed circuit board can thus be easily inserted with its edges into the parallel grooves and away from the first Housing part are held. Their contacts are easily accessible for applications of the features according to claim 5 because of the projecting arms.
- the second housing part provided with the contact arm can be joined together with the first housing part, the resilient contact arms of which engage the associated contacts of the contact strip on the printed circuit board.
- the resilient contact arms bias the circuit board in the direction of the interior of the housing of the first housing part and thus hold the circuit board firmly in the desired position.
- the contact arms come in the radial direction from the connector of the first housing part and can thereby have a comparatively large length. This in turn can be used to improve the spring action of the contact arms.
- the arms can thus be made comparatively long and without complicated shaping.
- the measures according to claim 7 allow the two housing parts to be joined together in a particularly simple and detachable manner.
- wires to be soldered are still formed by resilient contact arms, but by a flexible conductor foil.
- the flexible conductor foil Due to the position of the circuit board according to the invention, the flexible conductor foil is only slightly bent.
- the film can consist of a highly resilient, thermally stable material, so that even pouring or foaming the housing does not damage the connecting line (conductor film). A particularly great simplification is obtained by using the features of claim 9. Only a single flexible conductor foil is provided, on which both the first and second connecting lines are applied, so that the number of components to be assembled is thereby reduced.
- the feature combination according to claim 10 is recommended in a further development of the invention.
- the electrical circuit is applied to a separate, inherently fixed circuit board, so that it can be easily handled and mechanically fastened for measurement and adjustment purposes is.
- the attachment can be carried out by stamp soldering, through-contacting or a similar method. To that for the assembly and the conductor guidance
- the combination of features according to claim 11 is recommended in order to enlarge the space available on the rigid printed circuit board.
- a recess which is surrounded on all sides and into which short sections of the contactable conductor tracks protrude is therefore provided on the flexible conductor film.
- These contacts are connected to connecting contacts on the circuit board. This measure largely prevents the conductor film from reaching over the rigid circuit board, so that a larger assembly space is available.
- the arrangement of the printed circuit board according to the invention also creates the possibility of simple and safe mounting of the printed circuit board or printed circuit board, the printed circuit board serving for connection also being able to be designed as a flexible printed circuit film, as explained above.
- a corresponding guide groove can be provided on each side of the film or plate, or only a one-sided guide can be used.
- a further simplification, with which the additional printed circuit board can be saved, results from the combination of features according to claim 13.
- the electrical circuit is essentially represented by a highly integrated component.
- the bottom of the membrane pot should be accessible to the transmission medium air, so that preferably at least parts of the outer surface of the pot are enveloped by the elastic intermediate layer.
- the outer housing wall can at least partially enclose the intermediate layer (claim 16).
- the feature combination according to claim 16 is recommended in a further development of the invention. Strain relief is created here, since undercuts, for example in the form of serrations, result in undercuts, for example with regard to the pouring mass , which secure the conductor foil or the circuit board and thus simultaneously provide strain relief for the connecting lines. According to the combination of features according to claim 18, foaming of the interior of the housing has proven to be a suitable pouring compound.
- outlet of the connecting lines from the converter can be chosen as desired.
- the use of the combination of features according to claim 19 is particularly recommended here.
- the contacting of the second connecting lines to the cable set connecting a plurality of transducers with a central controller can be done by simple contactable areas on the protruding part of the second connecting line.
- These districts can by a waterproof connector according to the combination of features according to claim
- connection option to the cable set is in the combination of features according to claim
- the cable set also preferably consists of a flexible conductor foil, so that only the two foils e.g. must be connected to each other by plated-through holes or stamp soldering.
- Cable set has the advantage that the combination of features according to claim 23 can be used to attach these components to the bumpers. Because the conductor foils are flat, there is a sufficiently large area available for a firmly adhering adhesive layer.
- connection option between the cable set designed as flexible conductor foils and the connecting line or the connecting line and the printed circuit board stamp soldering is recommended, but other connection options can also prove themselves here, such as contact riveting or the like.
- the feature combination according to claim 25 is recommended in a further development of the invention.
- a strain relief clamp is provided which prevents the conductor foils from moving in the longitudinal direction of the conductor tracks.
- Fig. 1 in an exploded view of a transducer according to the invention in a first viewing direction.
- Fig. 2 shows the converter of FIG. 1 from a second viewing direction
- FIG. 4 shows an enlarged detail from FIG. 3 with an edge structure of the film acting as a strain relief
- FIG. 5 shows an enlarged detail according to FIG. 3
- FIG. 6 shows a section of an embodiment modified from FIG. 3
- Fig. 7 shows a possibility of mounting the board within the housing
- Fig. 8 in a highly schematic embodiment, a section through the converter according to the invention
- Fig. 9 is a perspective view of the transducer with the flexible conduit film led out as a transducer connection
- Fig. 10 in a symbolic representation a cable set with connection option for the individual transducers
- 11 shows a strain relief clamp with a contact area between the converter outlet and the cable set
- Fig. 12 is an enlarged section of FIG. 9 with strain relief clamp.
- the housing of the converter shown in FIG. 1 consists of a first housing part 1 and a second housing part 2, the second housing part being shown partly broken away in the figures.
- the first housing part has two projecting, opposite holding arms 3, which carry two guide grooves 4, which serve to guide and receive the edges 5 of the circuit board 6.
- the circuit board 6 can thus be inserted between the holding arms 3 and held by these.
- the printed circuit board is provided with a contact strip 7, which are arranged from individual contacts 8 on the end 9 of the printed circuit board 6 facing the second housing part 2.
- the contacts 8 are easily accessible from the outside, so that alignment measurements for the circuits on the circuit board 6 can be carried out without difficulty.
- the second housing part 2 is joined to the first housing part 1 via its latching tabs 10, which engage recesses (13) shown on the second housing part 2 in the assembled state.
- the second housing part 2 is provided with asymmetrically arranged recesses 33. This forces the two housing parts to be in the correct position relative to one another.
- a guide projection 14 is provided on the outer surface of the second housing part 2.
- the position in the longitudinal direction of the sensor is determined by a circumferential projection 15.
- the resonator 18 of the transducer is held in the interior of the first housing part 1 via an essentially annular plug.
- the invention is not limited to the use of the contact strip on the side 9 of the printed circuit board 6.
- Corresponding contacts can also be provided on the opposite side 19 of the printed circuit board and can be used, for example, for contacting this plate with the piezo crystal located in the resonator 17.
- Spring arms can also be provided for this purpose, which act on the piezo crystal at one end and on the other end to the contacts (not shown) on the printed circuit board.
- the resonator 18 can have an insert, for example, which ensures the resilient contact between the housing of the resonator or the piezo crystal on one side and the contacts on the side 19 of the printed circuit board 6.
- Holding arms 3 constructed as a 3D-MID part (conductive plastic), can continue to serve for contacting between resonator 18 and circuit board 6.
- FIG. 2 shows the transducer according to FIG. 1 in an exploded view from a different direction of view.
- the resilient contact arms 20, which extend in the radial direction from a radially arranged connector plug 21, not shown in the interior, are particularly important for the invention.
- the spring arms 20 carry connecting terminals 22 which extend in the longitudinal direction of the converter and which receive the contacts 8 on both sides of the printed circuit board 2 and thus create a good electrical connection.
- a receiving claw 23 can be molded onto the rear wall of the second housing part 20.
- An ultrasonic transducer consisting of the parts membrane 18, plug 17, housing front 1, populated circuit board 6 and housing rear 7 is to be installed.
- holding arms are molded onto the front housing part, which carry the circuit board.
- Connector contacts are attached to the circuit board in order to be able to implement simple connector contacts with the modified rear housing part 2.
- the membrane with the plug inserted is inserted from the front into the front housing part.
- the front housing part 2 wings 3 are molded with groove 4, into which the circuit board is inserted, and the strands are fixed to the circuit board and the laser adjustment during the soldering process of the circuit boards. This makes it easier to handle the converter in this preassembled state.
- the rear housing part with molded, customer-specific connector housing is clipped on or clipped on.
- pins are injected with sockets, as can also be found in circuit board connectors in the computer area. Accordingly, the circuit board is provided with plug-in contacts.
- the piezomembrane / printed circuit board is to be realized by means of a ring contact, which contacts in the area of the membrane by means of springs and also in the area of the printed circuit board with plug connections.
- FIG. 3 shows a flexible conductor foil 50 which comprises first connecting lines 51 and second connecting lines 52.
- the flexible conductor foil 50 has a continuous recess 53, into which short projections 54 project, into which the conductor tracks 49 of the connecting lines 51, 52 open.
- These conductor track ends are thus bare contact points, onto which contacts of a circuit board 56 can be placed, which can be designed, for example, as a rigid circuit board or possibly as a flexible circuit board.
- Electronic components and corresponding line connections are located on the circuit board, which are represented, for example, by an electronic module 57.
- the contacts 55 are electrically connected to one another in a suitable manner with the approaches acting as contact points 54, for example by means of stamp soldering, through-contacting or rivet contacting.
- the advantage here is that the flexible conductor foil both Connecting lines 51,52 and the receiving surface for the circuit board 56 includes.
- the line end 59 assigned to the piezo crystal or the piezo ceramic 58 is used to fasten the piezo crystal to the conductor foil 50, the piezo ceramic 58 being simultaneously contacted with respect to the first connecting line 51 via this conductor foil. Details are shown in FIG. 5.
- the second connecting line 52 opens into a plug housing 60 which has corresponding plug contacts or plug pins and which can be detachably inserted into a plug receptacle via a latching element 61.
- This plug which is designed as a watertight plug connection MQS, can, for example, be latched to the converter housing, but, as explained in connection with FIG. 8, can also be arranged movably with respect to the sensor housing via the connecting line 52.
- Fig. 4 a section A of Fig. 1 is drawn enlarged sketched. What is important here is the structured edge 63, which provides strain relief in the longitudinal direction of the flexible conductor foil 50 in the case of a foamed-in or molded-out housing.
- first connecting line 21 it is not necessary for the first connecting line 21 to be connected to the second connecting line 52 via the edge regions 64, 65.
- the connection can also take place via the printed circuit board 56 itself and corresponding mechanical or electrical connections, the electrical connections also simultaneously creating a mechanical connection.
- the structured edge 63 can also be attached in the corresponding edge regions of the circuit board 56 or the circuit board 56.
- Fig. 5 shows an enlarged view of the detail B in Fig. 1.
- the piezo crystal 59 has a substantially circular disc-shaped shape, on the surface facing the viewer, the annularly cut end 66 of the connecting line 51, wherein The contacting planes 67 of the piezo crystal 59 can be seen in the ring-shaped cut-out area, on which contact ends 68 of the conductor tracks of the connecting line 51 are contacted.
- FIG. 6 shows a different solution for the construction of the electronic circuit, with a highly integrated module being placed on the flexible conductor film 50 which has no recess instead of the circuit board 56.
- the highly integrated component ASIC is labeled 69.
- the areas not shown in relation to FIG. 3 can be designed as shown in FIG. 3.
- the insertion grooves 70 which serve to guide the edge of the flexible conductor foil 50 or the edge of the circuit board 56 or circuit board, are particularly important.
- the component group Fig. 3 is inserted into the one-piece sensor housing 71 in a symbolic representation.
- the circuit board 56 is equipped with electronic components 57.87 on both sides, the electronic module 57 protruding through the recess 53 of the flexible circuit film 50 according to FIG. 3.
- the piezo crystal 59 sits on the bottom 72 of the transducer pot 73, the interior of the hollow cylindrical housing 71 is filled or foamed with plastic in order to secure the assemblies seated in the housing 71 or the interior of the transducer pot serving as resonator 73 in a suitable manner to vaporize.
- a free end 74 of the second connecting line 52 protrudes from the potting compound 75 of the converter housing 71, so that the connector 60 attached to the end of the connecting line 52 according to FIG. 3 is free relative to the converter housing
- Four holes 80 are also drawn in the free end 74, which can serve, for example, to relieve the strain on the connecting line 52 in the contact area.
- a clamp 82 can be provided, which secures the free end 74 of the connecting line 52, the converter 77.
- a suitable strain relief clamp 82 is shown in FIG. 11, the clamp body being secured against the vehicle, for example, by means of a bumper shown in FIG. 10 is.
- the clamp 82 in FIG. 11 can, for example, not only serve for strain relief, but also support the contacting, with pins 85 reaching through the holes 80 for strain relief.
- the cover of the clamp 82 is secured by a snap connection.
- a cable set 85 can be used to connect individual transducers fastened to the bumper 83 to a central plug 86.
- the cable set 85 can in turn be designed as a flexible conductor foil, the conductor tracks 78 of which are connected to one another by means of stamp soldering via the associated contact regions 79 in accordance with FIG. 11.
- the cable set 85 is divided into a number of outgoing ends 86, which are led to the free ends 74 of the individual converters, not shown.
- the cable set 85 designed as a flat flexible conductor foil can be provided with an adhesive layer with which it is glued to the inside of the bumper 83.
- the contact areas form solder joints and serve as prepared solder deposits.
- the tines 88 reach through corresponding holes 80 in both film sections 86, 74, the film sections projecting like a tab from the converter housing 74 or the cable set 85 (FIG. 9, FIG. 10).
- the flexible conductor foils can be made of polyamide. It is a plastic
- the procedure can be as follows: the membrane is either stored in a silicone ring within the housing or is injected directly into the housing or inserted into the one-piece cylindrical housing part 71.
- the flexible circuit foil 50 is placed over the circuit board or circuit board 56 and the circuit board is electrically and mechanically connected to the foil by means of stamp soldering (5-fold).
- the entire strand, including the preassembled piezo crystal, is then inserted forward into the housing.
- the piezo crystal 59 is applied to the housing base by applied plastic and thus glued to the membrane and the flexible conductor film is secured in the area of the circuit board via the insertion groove 70 integrated in the housing 71.
- the part of the circuit board that still has to be measured and aligned with a laser still looks out of the housing. After the laser adjustment, the printed circuit board is then pushed fully into the housing 51 and potted or foamed. It is also conceivable, as shown in FIG. 77, to design the housing 71 in two parts.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Looms (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19736753 | 1997-08-23 | ||
DE19736753 | 1997-08-23 | ||
DE19835782A DE19835782A1 (en) | 1997-08-23 | 1998-08-07 | Ultrasonic transducer with a circuit board arranged in the longitudinal direction of the transducer for an electrical circuit |
DE19835782 | 1998-08-07 | ||
PCT/EP1998/005171 WO1999010875A2 (en) | 1997-08-23 | 1998-08-14 | Ultrasonic converter with a board for an electric circuit arranged in the longitudinal direction of the converter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1005693A2 true EP1005693A2 (en) | 2000-06-07 |
EP1005693B1 EP1005693B1 (en) | 2003-02-12 |
Family
ID=26039416
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98948834A Expired - Lifetime EP1005693B1 (en) | 1997-08-23 | 1998-08-14 | Ultrasonic converter with a board for an electric circuit arranged in the longitudinal direction of the converter |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1005693B1 (en) |
ES (1) | ES2188018T3 (en) |
WO (1) | WO1999010875A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10344464A1 (en) * | 2003-09-25 | 2005-04-14 | Nexans | Device for detecting signals from sensors arranged in a motor vehicle |
DE102008012913A1 (en) * | 2008-03-06 | 2009-09-10 | Valeo Schalter Und Sensoren Gmbh | Electrical component or device with a flexible printed circuit board |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3382654T2 (en) * | 1982-07-21 | 1993-05-13 | Technicare Corp | ULTRASONIC TRANSDUCER PROBE WITH DOUBLE OPENING. |
DE3623520A1 (en) * | 1985-07-15 | 1987-01-22 | Advanced Tech Lab | Phase-controlled ultrasonic array-type transducer |
JPS62294921A (en) * | 1986-06-14 | 1987-12-22 | Omron Tateisi Electronics Co | Ultrasonic wave detector |
EP0283823B1 (en) * | 1987-03-20 | 1990-10-03 | Siemens Aktiengesellschaft | Apparatus for generating and radiating ultrasound, especially for ultrasound therapy |
DE3826799C2 (en) * | 1988-08-06 | 1995-08-31 | Teves Gmbh Alfred | Ultrasonic transducer |
DE19601656B4 (en) * | 1996-01-18 | 2009-07-16 | Valeo Schalter Und Sensoren Gmbh | Steamed ultrasonic transducer |
-
1998
- 1998-08-14 WO PCT/EP1998/005171 patent/WO1999010875A2/en active IP Right Grant
- 1998-08-14 ES ES98948834T patent/ES2188018T3/en not_active Expired - Lifetime
- 1998-08-14 EP EP98948834A patent/EP1005693B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9910875A3 * |
Also Published As
Publication number | Publication date |
---|---|
EP1005693B1 (en) | 2003-02-12 |
WO1999010875A2 (en) | 1999-03-04 |
WO1999010875A3 (en) | 1999-05-06 |
ES2188018T3 (en) | 2003-06-16 |
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