EP2018702A1 - Interrupteur de proximité et procédé de mise en contact d'une carte à circuit imprimé de capteur - Google Patents

Interrupteur de proximité et procédé de mise en contact d'une carte à circuit imprimé de capteur

Info

Publication number
EP2018702A1
EP2018702A1 EP07720123A EP07720123A EP2018702A1 EP 2018702 A1 EP2018702 A1 EP 2018702A1 EP 07720123 A EP07720123 A EP 07720123A EP 07720123 A EP07720123 A EP 07720123A EP 2018702 A1 EP2018702 A1 EP 2018702A1
Authority
EP
European Patent Office
Prior art keywords
print
contact
housing
proximity switch
sensor
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Withdrawn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
EP07720123A
Other languages
German (de)
English (en)
Inventor
Bernd Jenne
Burkhard Reetmeyer
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.)
Baumer Electric AG
Original Assignee
Baumer Electric AG
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 Baumer Electric AG filed Critical Baumer Electric AG
Publication of EP2018702A1 publication Critical patent/EP2018702A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9505—Constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/24—Housings ; Casings for instruments
    • G01D11/245—Housings for sensors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K2017/9455—Proximity switches constructional details

Definitions

  • the invention relates to proximity switches and a method for contacting a Sensorprints according to the features of the claims 1 and 6.
  • Proximity sensors and distance sensors which detect the distance of objects by means of different physical principles and generate a digital or analog electrical output signal as a function of the object distance, often comprise a cylindrical or a cuboid housing made of metal or plastic.
  • a thread for attaching the sensor to a machine part is usually formed on the outer lateral surface.
  • Inductive proximity switches and position sensors usually comprise an oscillator with a coil inserted into a ferrite core, an evaluation stage and an output amplifier.
  • the coil is arranged in the region of the one sleeve end, wherein the coil unit is usually covered by means of a plastic or ceramic cap arranged flush with the sleeve or projecting beyond the sleeve.
  • a print or a printed circuit board with those for controlling the oscillator and for evaluating the Sensor measured size required components arranged.
  • the printed circuit board may be fastened to the pot core, for example, by means of mechanical connecting means.
  • the ends of the coil wire are electrically connected in such known sensors by soldering with contact surfaces on the print. At the opposite end of the print ' further contact surfaces for soldering a connection plug or a cable are formed. These form the interface of the sensor to the outside.
  • the interior of the housing is e.g. Poured from the connection side with a hardening casting resin, after the print and the coil unit has been inserted into the sleeve and the end cap has been placed on the front side. Subsequently, the rear end plug is placed with the outwardly guided contacts on the sleeve.
  • slightly different methods for assembling such sensors are also known.
  • the production or the assembly of such conventional sensors is relatively complicated and expensive due to the solder joints required for the contacting of the sensor element and the sensor interface and due to the casting with a casting resin.
  • the invention is based on the idea to dispense with solder joints when connecting sensor elements and / or contact elements for the sensor interface and instead to use solderless connection means such as spring and / or terminal contacts.
  • solderless connection means such as spring and / or terminal contacts.
  • the manufacturing process of the sensors can be significantly simplified.
  • suitable spring and terminal contacts sufficiently good electrical connections between the print and sensor elements (eg coils) and / or between the print and contact pins for connecting a connector or a connection cable.
  • solderless connections are functional even under adverse conditions of use and are particularly suitable for the production of sensors in which the housing with the Electronics is not shed as usual with a thermosetting casting resin.
  • the contacting of the sensor print according to the invention is preferably used in sensors with a housing jacket produced by injection molding.
  • Such sensors may e.g. a housing with an outer, usually metallic housing shell and an injection-molded on the inside of the inner sheath made of plastic.
  • the housing is preferably cylindrical or cylindrical with a round
  • the housing may also have a square, a rectangular or any other cross-sectional shape.
  • the housing may have different cross-sectional areas at different locations in the axial direction predetermined by the housing jacket.
  • the injection molded plastic inner sheath acts as an electrical insulator between the arranged on a printed circuit board inside the housing sensor electronics and the outer housing shell. Guides formed on the inner side of the inner sheath allow a simple and guided insertion of a printed circuit board equipped with electronic components into the housing and then hold them in the position provided for this purpose.
  • Plastic sheath and the outer sleeve or the outer housing shell should solve. In particular, this can be ensured in cylindrical housings an anti-rotation and a displacement protection of the two housing shells.
  • a partition or a bottom is formed, which divides the interior of the housing into a front compartment and a rear subspace.
  • the front subspace is intended for receiving the electronics with the sensor element (s).
  • the rear, usually much shorter subspace is designed as a connector receptacle for connecting a connecting cable by means of connectors.
  • contact elements are cast into the ground or partially encapsulated in plastic.
  • the contact elements project beyond the ground on both sides.
  • the contact elements are all the same and shaped as cranked stampings. To connect a plug contact pins of the contact elements protrude backwards out of the
  • the positions of the contact pins correspond to the positions of the corresponding contact springs of the desired connector.
  • the rear part of the inner housing shell is designed such that it corresponds with the provided connector plugs. In particular, for example, in the rear region on the inside of the inner shell projecting ribs may be provided, which serve as reverse polarity protection when connecting a plug with corresponding grooves.
  • the projecting into the housing part of the contact elements is fork-shaped with contact springs or contact cutting.
  • the contact elements are arranged such that axially projecting into the housing interior contact forks are in a row. When inserting a populated printed circuit board it is clamped between the fork arms, wherein the contact springs or -ste produce solderless electrical connections with corresponding pads or pads on the circuit board.
  • the production of a sensor with the inventive PrintAuthierung is very simple.
  • the electronic print is inserted along the guides on the inner wall of the housing into the housing until its rear end is clamped between the contact forks and the electrical connection of the contact elements is made with the pads on the circuit board.
  • a plastic end cap is connected to or attached to the print.
  • the end cap is preferably designed to serve as a support for the or Sensor elements - for example, a coil with a ferrite core - can be used so that they are arranged as close to the front end of the sensor housing.
  • the end cap and coil support may also be designed as separate parts and otherwise secured to the print or to the housing.
  • the electrical connection of the sensor elements to the print can be done, for example, by soldering or bonding of connection wires or according to the invention solderless by means of plug connections.
  • the end cap or the end cap in the edge region e.g. connected by laser welding, ultrasonic welding or gluing with the front end of the inner shell.
  • the front compartment of the housing is sealed tight.
  • encapsulation of the interior of the housing with a hardening potting compound is not required, but nevertheless possible if required.
  • additional means such as e.g. elastic sealing lips may be provided which prevent or complicate the direct contact of the casting resin with the contact elements and thus prevent the interruption of solder-free contacts by the thermosetting casting resin.
  • additional means such as e.g. elastic sealing lips may be provided which prevent or complicate the direct contact of the casting resin with the contact elements and thus prevent the interruption of solder-free contacts by the thermosetting casting resin.
  • Cutting contacts may be provided which cut or impress or impress in corresponding contact surfaces and thus prevent contact interruption by casting resin.
  • Figure 2 shows two views of a contact element
  • Figure 3 is a perspective view of a
  • Figure 3a is a perspective view of another
  • FIG. 4 shows an exploded view of a further inductive proximity switch
  • FIG. 5 shows a coil carrier of the proximity switch from FIG. 4,
  • FIG. 6 shows a first longitudinal section of the proximity switch from FIG. 4,
  • FIG. 7 shows a second longitudinal section of the
  • Proximity switch of Figure 4 in the plane of the circuit board.
  • FIG. 1 shows a longitudinal section through a first inductive proximity switch 1 with a cylindrical outer housing shell 3 made of metal, also Metal sleeve or sleeve called.
  • the housing axis a is shown by a dot-dash line.
  • the front region of the metal sleeve comprises an external thread 5 for mounting the sensor at its destination, for example on a machine part.
  • On the inner wall 7 of the outer housing shell 3 radially extending notches or grooves 9 and paragraphs 11 are formed, so that the sleeve has different cross sections or inner diameter depending on the axial position there.
  • a bore 13 or another recess which penetrates the outer housing jacket 3 is formed in the rear region.
  • an inner housing shell 15 is injection molded from plastic.
  • the plastic preferably completely fills the bore 13 and closes flush with the outside of the outer housing jacket 3.
  • the structures on the inner wall 7 of the outer casing jacket prevent a relative movement between the two Gescousemänteln 3, 15 even if the adhesive bond produced by the injection molding process between the shells 3, 15 should solve.
  • a transparent plastic for the inner housing shell 15 or at least for the part of the housing shell 15 in the region of holes 13 a light-emitting diode or other optical display means and / or elements of an infrared communication interface so in the interior of the housing be arranged so that it is visible from the outside.
  • the inside of the inner housing shell 15 is preferably two diametrically opposite, extending in the direction of the housing axis a guide grooves 8 for guided insertion and holding a circuit board or a populated with electronic components 10 prints excluded.
  • guide ribs or other guide elements projecting into the interior of the housing may also be formed on the inner housing shell 15.
  • the inside of the inner casing shell 15 is at least in the front region of the housing in the direction of the housing axis a slightly conical or formed with a light suit, such that the inner diameter d 2 slightly increased towards the front housing end.
  • a corresponding insert of the injection mold can be more easily pulled out of the sleeve after the injection of the inner housing shell 15.
  • the front end of the inner housing shell 15 is thin-walled with a shoulder or shoulder 16 with a larger inner diameter d 3 for receiving a
  • Shell core 45 formed.
  • An intermediate wall or a floor 17 separates the space enclosed by the inner housing jacket 15 into a front partial space 19a and a rear partial space 19b.
  • a plurality of contact elements 21 are injected into the bottom 17 or partially encapsulated by the plastic of the bottom 17, such that contact pins 23 for connecting a cable connector after protrude back into the rear part of space 19b.
  • the protruding into the front part of the space 19a part of each of the Needleselernente 21 comprises two opposing, arranged on two fork arms 25 spring contacts or contact blades 27.
  • proximity switch 1 shown in Figure 1 are four equal, as cranked stampings manufactured contact elements 21 in arranged in a row, wherein in the illustrated longitudinal section only two of the contact pins 23 and only the two fork arms 25 of the contact elements 21 are visible.
  • FIG. 2 shows such a contact element in a top view (top) and in a side view (bottom).
  • the pin axis s of the contact pins 23 is below the fork arms 25 and - due to the crank in the central region 29 of the stamped part - laterally offset to these fork arms 25.
  • Four identical stampings of this type can in the front part of space 19a as Printaufnähme with four adjacently arranged fork arms 25 and in the rear subspace 19b be arranged as corner points of a square or rectangle arranged contact pins 23 for connecting a connector plug.
  • a recess 31 in the central region 29 of the contact elements 21 is filled during encapsulation with the plastic compound of this and is used for Stabilization and absorption of forces when contacting or disconnecting a connector.
  • FIG. 3 shows a cover lid or a cap 35 made of plastic in a first embodiment. It comprises a round front plate 37, a flange-shaped coil carrier 39 integrally formed thereon and a cylindrical, centrally arranged retaining pin 41 with a forked end 43 for receiving and clamping a print 10.
  • the cap 35 is designed such that a pot-like ferrite pot core 45 can be pushed or plugged with an E-shaped cross-section and a central bore on the retaining pin 41 so that it (not shown) wound on the coil carrier 39 coil three-sided channel or torus-like sheathed ( Figure 1).
  • the rear end 43 of the central retaining pin 41 projects beyond the bottom surface 40 of the shell core 45.
  • the front end of the rectangular print 10 is clamped in the fork-like recess on the retaining pin 41.
  • the free ends of the wound on the bobbin 39 coil wire for example, directly with corresponding contact points 46 on the print 10, for example be connected by soldering.
  • the ends of the coil wire according to the invention can also be connected indirectly with contact points on the print 10.
  • metallizations 47 (FIG. 3) formed on the cap 35.
  • These metallizations 47 are connected to further contact elements, for example by means of connecting wires or printed conductors 49 introduced or injected into the coil carrier 39, for example further metallizations 51 formed on the insides of the fork-like end 43 of the holding pin 41.
  • the contact points 46 on the print 10 are arranged in this way in that when attaching the cap 35 to the print 10, a solderless electrical connection is made between the metallizations 51 on the retaining pin 41 or the coil and the contact points 46 on the print 10.
  • the coil or generally the sensor element is thus electrically connected to the sensor electronics.
  • connection pins or contact pins 61 on the coil carrier 39 protrude to the rear. These can either be soldered directly to corresponding pads 46 on the print 10 or plugged into corresponding sockets (not shown) on the print 10.
  • the print 10 together with the cap 35 inserted from the front along the guides 8 in the housing until it is clamped in the region of its rear end between the fork arms 25 of the contact elements 21 and the contact blades 27 on one or both sides on the print 10 formed corresponding pads or contact surfaces 53 have contacted.
  • the shell core 45 comes into contact with the shoulder 16 or the shoulder of the inner side, which is thin-walled on the front side
  • Housing jacket 15 In this position, the front end of the inner housing shell 15 and the edge of the front panel 37 are sealed together, for example by laser welding, ultrasonic welding or by gluing.
  • the bobbin 39 and the cap 35 are formed as separate parts.
  • the metallization 51 other contact elements such as on the bobbin 39 to the rear excellent contact pins 61 or alternatively contact springs or contact blades are formed with corresponding contact elements on the print 10, for example with pads or pads 46 or with sockets (not shown) on the Print 10 are connected.
  • the Connections made with contact elements on the print 10 by means of thermal bonding method or solderless.
  • the inner housing shell 15 may be formed in this embodiment of the invention as a separate plug, which is substantially shorter than the outer housing shell 15, and which is inserted or pressed from the rear opening forth in the rear region of the outer housing shell 3.
  • the cap 35 is formed like a can, wherein the peripheral edge 55 is inserted or pressed into the gap between the shell core 45 and the outer housing shell 3.
  • sealing elements such as O-rings may be provided (not shown).
  • the non-positive connections between the cap 35 and the inner housing shell 15 and the outer housing shell 3 can be additionally secured by locking means (not shown).
  • the contact pins 61 are soldered to corresponding contact points 46 or pads on both sides of the print 10.
  • the idea underlying the invention comprises all possible combinations in which the print 10 of a distance sensor or proximity switch 1 by means of plug-in contacts with a sensor or Proximity switch 1 associated connection interface (eg pins 23 for a connector or for connecting a cable) and / or a distance sensor or proximity sensor 1 associated sensor element (eg coil) is connected.
  • the compounds can be formed in any manner by means of plug contacts and couplings or by means of contact springs or contact blades, which are pressed against metallized contact elements.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

Le capteur de proximité (1) comporte une carte à circuit imprimé (10) contenant l'électronique de capteur, un élément de capteur et une interface de capteur. Les connexions électriques entre la carte à circuit imprimé (10) et l'interface de capteur et/ou l'élément de capteur sont réalisées au moyen de contacts enfichables. Dans un mode de réalisation préféré, des éléments de contact (21) pourvus de fourches (25) et de dents de contact (27) sont créés sur le boîtier de capteur, et la carte à circuit imprimé (10) est enfichée de telle manière dans la fourche (25) que les dents de contact (27) réalisent une connexion électrique avec les surfaces de contact (53) sur la carte à circuit imprimé (10).
EP07720123A 2006-05-12 2007-05-04 Interrupteur de proximité et procédé de mise en contact d'une carte à circuit imprimé de capteur Withdrawn EP2018702A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7802006 2006-05-12
PCT/CH2007/000226 WO2007131374A1 (fr) 2006-05-12 2007-05-04 Interrupteur de proximité et procédé de mise en contact d'une carte à circuit imprimé de capteur

Publications (1)

Publication Number Publication Date
EP2018702A1 true EP2018702A1 (fr) 2009-01-28

Family

ID=38283055

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07720123A Withdrawn EP2018702A1 (fr) 2006-05-12 2007-05-04 Interrupteur de proximité et procédé de mise en contact d'une carte à circuit imprimé de capteur

Country Status (3)

Country Link
US (1) US20090203269A1 (fr)
EP (1) EP2018702A1 (fr)
WO (1) WO2007131374A1 (fr)

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DE102010064607B3 (de) 2010-05-21 2019-07-11 Baumer Electric Ag Induktiver Sensor
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DE102012220003B4 (de) * 2012-11-02 2022-01-05 Ifm Electronic Gmbh Messgerät für die Prozess- und Automatisierungstechnik und Verfahren zu dessen Herstellung
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Also Published As

Publication number Publication date
US20090203269A1 (en) 2009-08-13
WO2007131374A1 (fr) 2007-11-22

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