EP2018520A2 - Boîtier de capteur - Google Patents

Boîtier de capteur

Info

Publication number
EP2018520A2
EP2018520A2 EP07720121A EP07720121A EP2018520A2 EP 2018520 A2 EP2018520 A2 EP 2018520A2 EP 07720121 A EP07720121 A EP 07720121A EP 07720121 A EP07720121 A EP 07720121A EP 2018520 A2 EP2018520 A2 EP 2018520A2
Authority
EP
European Patent Office
Prior art keywords
sensor
housing
shell
housing shell
sensor housing
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Withdrawn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
EP07720121A
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 EP2018520A2 publication Critical patent/EP2018520A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • the invention relates to a sensor housing for inductive proximity sensors, a corresponding
  • 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 metal or metal housing
  • 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.
  • Inside the housing is a print or a printed circuit board with the Control of the oscillator and arranged to evaluate the sensor measurement required components.
  • 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.
  • a hardening casting resin e.g.
  • the inventive sensor housing comprises an outer, usually metallic housing shell with an inner shell molded on the inside of plastic.
  • the housing is preferably cylindrical or cylinder-like with a round housing cross-section and with or alternatively without external thread on the outer sleeve.
  • the housing may also have a square, a rectangular or any other cross-sectional shape.
  • the housing may differ in different directions 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 inside of the inner shell allow easy and guided insertion of electronic components equipped PCB in the housing and then keep this in the space provided.
  • Longitudinal or transverse grooves, bores or other formed on the inside of the outer housing shell structures ensure that the inner housing shell and the outer housing shell can not move relative to each other, even if the bonding between the injected plastic shell and the outer sleeve or should solve the outer housing shell. In particular, this can be ensured in cylindrical housings an anti-rotation and a displacement protection of the two housing shells.
  • a partition wall or a bottom can be formed on the inner shell, which divides the interior of the housing into a front part space and a rear part space.
  • the front subspace is intended for receiving the electronics with the sensor element (s).
  • the rear, usually much shorter subspace is as a connector receptacle for connecting a connecting cable means
  • contact elements are poured 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.
  • a Plug contact pins of the contact elements protrude backwards out of the ground.
  • the positions of the contact pins correspond to the positions of the corresponding contact springs of the desired connector.
  • Housing jacket is designed such that it corresponds with the provided connector plugs.
  • 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.
  • 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 the print or attached to it.
  • the end cap is preferably designed so that it can be used as a support for the sensor element or elements - for example, a coil with a ferrite core - so that they are arranged as close as possible 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. if the
  • Sensor elements are not arranged directly on the print, the electrical connection of the sensor elements with the print, for example by soldering or bonding of leads or alternatively by means of connectors.
  • the end cap or the end cap is connected in the edge region, for example by laser welding, ultrasonic welding or gluing with the front end of the inner shell.
  • the front compartment of the housing is sealed tight.
  • the ends of the inner shell may be formed, for example, flange-like and slightly beyond the front edge of the outer jacket sleeve.
  • the frontal edge of the outer jacket sleeve may also project beyond the end of the inner jacket sleeve or be arranged flush therewith. This is especially beneficial when finishing caps be fused by means of ultrasound with the inner jacket sleeve.
  • FIG. 1 shows a longitudinal section of a first inductive proximity switch
  • FIG. 2 shows two views of a contact element
  • FIG. 4 shows a longitudinal section of a further inductive proximity holder
  • FIG. 5 shows a detailed view of the proximity switch from FIG. 4.
  • Figure 1 shows a longitudinal section through a first inductive proximity switch 1 with a metal manufactured cylindrical outer casing 3, also called metal sleeve or sleeve.
  • 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 di depending on the axial position.
  • 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 jacket 15 or at least for the part of the housing jacket 15 in the region of holes 13 a light-emitting diode or another optical display means and / or elements of an infrared Communication interface are arranged inside the housing so that it is visible from the outside.
  • the inner housing shell 15 On the inside of the inner housing shell 15 are 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 inner side of the inner casing shell 15 is slightly conical or formed with a light suit at least in the front region of the housing in the direction of the housing axis a such that the inner diameter ⁇ . 2 slightly increases towards the front housing end.
  • 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 is 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 protrude back into the rear compartment 19b.
  • the protruding into the front part of the space 19a part of each of the contact elements 21 comprises two opposing, arranged on two fork arms 25 spring contacts or
  • contact elements 21 are 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 19a as a print recording 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 so that a pot-like ferrite pot core 45 with E-shaped cross-section and a central bore can be pushed or plugged onto the retaining pin 41 such that it surrounds a coil wound on the coil support 39 (not shown) on three sides in the manner of a channel or torus (FIG. 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 are directly with corresponding pads 46 on the print 10, for example connected by soldering. Alternatively, the ends of the coil wire may also be connected indirectly to pads 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 inner sides 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 the cap 35 is pushed onto the print 10, an 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.
  • the shell core 45 comes when inserting the print 10 into contact with the shoulder 16 and the shoulder of the front thin-walled inner housing shell 15. In this position, the front end of the inner housing shell 15 and the edge the front panel 37 tightly connected to each other, for example by laser welding or gluing.
  • the bobbin 39 and the cap 35 are formed as separate parts.
  • the coil unit with the shell core 45, the coil support 39 and the coil wound thereon can be connected to the print 10, for example, only by soldering the ends of the coil wires to the intended contact points 46.
  • further attachment means may be provided to secure the spool assembly to the print 10.
  • the print 10 is inserted along the guides 8 in the housing and held in its end position between the fork arms 25 of the contact elements 21.
  • the contact blades 27 in turn contact the contact surfaces 53 provided on the print 10.
  • the coil unit is inserted into the foremost housing region with the thin-walled inner housing jacket 15.
  • FIG. 5 shows a detail of this proximity switch 1 in the area of connection of the cap 35 and the inner housing shell 15.
  • the cap 35 comprises a peripheral edge 55 with a knife-like shaped
  • Welding edge 57 This is brought into abutment with the front edge of the inner housing shell 15 and welded by applying the cap 35 with ultrasonic energy with this.

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 un boîtier de capteur présentant une enveloppe de boîtier extérieure (3) et une enveloppe de boîtier intérieure (15) appliquée sur la paroi intérieure (7) du boîtier par moulage par injection. Une base moulée (17) divise l'intérieur du boîtier en deux espaces partiels (19a, 19b). Cette base (17) contient des éléments de contact intégrés (21) permettant de créer des connexions sans matériau d'apport avec des surfaces de contact sur une carte à circuit imprimé (10). Le boîtier de capteur est fermé sur le côté frontal par soudage d'un capot plastique (35). Un coulage du boîtier de capteur avec une résine de coulée durcissable n'est pas nécessaire.
EP07720121A 2006-05-12 2007-05-04 Boîtier de capteur Withdrawn EP2018520A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7792006 2006-05-12
PCT/CH2007/000224 WO2007131372A2 (fr) 2006-05-12 2007-05-04 Boîtier de capteur

Publications (1)

Publication Number Publication Date
EP2018520A2 true EP2018520A2 (fr) 2009-01-28

Family

ID=38616844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07720121A Withdrawn EP2018520A2 (fr) 2006-05-12 2007-05-04 Boîtier de capteur

Country Status (2)

Country Link
EP (1) EP2018520A2 (fr)
WO (1) WO2007131372A2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007018758B4 (de) 2007-01-08 2019-05-29 Asm Automation Sensorik Messtechnik Gmbh Winkelsensor
DE102008059661B4 (de) * 2008-11-28 2014-05-22 Sensopart Industriesensorik Gmbh Optischer Sensor
DE102011084741B4 (de) * 2011-10-19 2013-11-07 Ifm Electronic Gmbh Näherungsschalter mit metallischer Außenhülle
EP2615426A1 (fr) 2012-01-16 2013-07-17 Baumer Electric AG Capteur
DE102012204911B4 (de) 2012-03-27 2024-09-19 Robert Bosch Gmbh Stützeinheit für eine Leiterplatte in einer Sensoreinheit und korrespondierende Sensoreinheit
DE102013110866A1 (de) * 2013-10-01 2015-04-02 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt Kapazitive Sensoranordnung eines Kraftfahrzeugs
DE102015007550B4 (de) * 2015-06-16 2019-12-12 Baumer Electric Ag Elektrischer Sensor
DE102018124845A1 (de) * 2018-10-09 2020-04-09 Sick Ag Sensoreinheit
DE102024117907A1 (de) * 2024-06-25 2026-01-08 Sick Ag Sensorgehäuse mit einem Sensorelement und Verfahren zur Herstellung eines Sensorgehäuses mit einem Sensorelement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3818499A1 (de) * 1988-05-31 1989-12-07 Ifm Electronic Gmbh Elektronisches schaltgeraet, insbesondere naeherungsschalter
DE19625589B4 (de) * 1996-06-27 2004-03-25 Ifm Electronic Gmbh Näherungsschalter
DE10109442B4 (de) * 2001-02-27 2007-09-06 Ifm Electronic Gmbh Verfahren zur Herstellung eines Näherungsschalters und Näherungsschalter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007131372A3 *

Also Published As

Publication number Publication date
WO2007131372A3 (fr) 2008-01-10
WO2007131372A2 (fr) 2007-11-22

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