US20170282425A1 - Switch housing for capacitive switches - Google Patents

Switch housing for capacitive switches Download PDF

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Publication number
US20170282425A1
US20170282425A1 US15/627,487 US201715627487A US2017282425A1 US 20170282425 A1 US20170282425 A1 US 20170282425A1 US 201715627487 A US201715627487 A US 201715627487A US 2017282425 A1 US2017282425 A1 US 2017282425A1
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US
United States
Prior art keywords
switch
electrode structures
switch housing
housing
plastic component
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.)
Abandoned
Application number
US15/627,487
Inventor
Udo Koberstein
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.)
BCS Automotive Interface Solutions GmbH
Original Assignee
BCS Automotive Interface Solutions GmbH
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 BCS Automotive Interface Solutions GmbH filed Critical BCS Automotive Interface Solutions GmbH
Priority to US15/627,487 priority Critical patent/US20170282425A1/en
Assigned to TRW AUTOMOTIVE ELECTRONICS & COMPONENTS GMBH reassignment TRW AUTOMOTIVE ELECTRONICS & COMPONENTS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOBERSTEIN, UDO
Publication of US20170282425A1 publication Critical patent/US20170282425A1/en
Abandoned legal-status Critical Current

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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
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • 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
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • H03K17/9622—Capacitive touch switches using a plurality of detectors, e.g. keyboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C2045/169—Making multilayered or multicoloured articles injecting electrical circuits, e.g. one layer being made of conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H2009/0285—Casings overmoulded over assembled switch or relay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H2011/0081—Apparatus or processes specially adapted for the manufacture of electric switches using double shot moulding, e.g. for forming elastomeric sealing elements on form stable casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2223/00—Casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/044—Injection moulding
    • H01H2229/046—Multi-colour or double shot injection moulding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/006—Containing a capacitive switch or usable as such
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960755—Constructional details of capacitive touch and proximity switches

Definitions

  • the invention relates to a method of producing a switch housing for capacitive switches, to a switch housing which has integrated electrically conductive electrode structures, and to a capacitive switch equipped with the switch housing.
  • Capacitive switches are in principle composed of a flat electrode on one side of a dielectric material layer, the face of which facing away therefrom forming a contact surface.
  • Switch housings for capacitive switches are usually made of plastic material.
  • the front face of the switch housing forms the contact surface, and the face opposite thereto on the inside of the switch housing supports an electrically conductive electrode structure.
  • Such electrode structures can be applied as conductive layers onto the electrically non-conductive plastic material of the switch housing using a so-called conductive lacquer or other electrically conductive materials. Only thin layers can be applied by means of usual coating methods.
  • the required electrode structures may have a complex shape so that specific coating methods are required. For the secure contacting of the electrode structures, precise 3-D structures are necessary which can only be obtained with difficulty with a coating method. For applications in the automotive field, conventional coating solutions are furthermore mechanically susceptible and prone to corrosion.
  • a method of producing a switch housing for capacitive switches having a contact surface by two-component injection molding is provided.
  • a housing body is first injected using a first, electrically insulating plastic component, the housing body having recessed regions on the inside in a position opposite the contact surface.
  • a second, electrically conductive plastic component is then injected into the recessed regions, which contains the same base material as the first plastic component, a polycarbonate, for example.
  • the conductivity of the second plastic component results from the addition of conductive particles such as carbon fibers.
  • the structures injected using the electrically conductive plastic component may have any complexity and a sufficient thickness to ensure a high mechanical strength.
  • the electrode structure thus realized enter into an intimate connection with the first, electrically non-conductive plastic component, as both plastic components have the same base material.
  • the switch housing for capacitive switches produced by the invention has an outer contact surface and flat electrode structures which are arranged on the inside in a position opposite the contact surface and which are placed by two-component injection molding in recessed regions of the housing body injected from a first, electrically non-conductive plastic component using a second, electrically conductive plastic component.
  • both plastic components are a polycarbonate, the second plastic component containing carbon fibers.
  • the flat electrode structures comprise recessed windows, and the contact surface is translucent opposite the recessed windows.
  • the switch according to the invention equipped with this switch housing has symbols arranged on the contact surface of the switch housing which can be illuminated through the recessed windows of the electrode structures and through thinned wall regions of the switch housing.
  • the flat electrode structures are configured with integrally formed contact tags which are guided to a contacting block formed integrally on the inside of the housing body.
  • the contacting block has cutouts in which the ends of the contact tags are positioned and form flush contacting surfaces with the surface of the contacting block. It is therefore easily possible to contact the electrode structures with a circuit board arranged on top by a simple insertion of conductive rubber structures.
  • FIG. 1 a perspective view of a switch housing prior to the incorporation of electrode structures
  • FIG. 2 the switch housing with the electrode structures inserted
  • FIG. 3 the switch housing with a circuit board placed thereon
  • FIG. 4 a perspective view of a capacitive switch produced using the switch housing.
  • FIG. 1 shows a generally cuboidal switch housing which is injected using a first, electrically non-conductive plastic component with a view to the inside.
  • the end face of the switch housing generally denoted by 10 , which is opposite the inside forms a contact surface of the capacitive switch.
  • the corresponding wall is configured with flat cutouts 12 .
  • a second, electrically conductive plastic component is incorporated into these cutouts by two-component injection molding. The result is illustrated in FIG. 2 .
  • the structures injected using the second plastic component are electrically conductive and have the shape of the electrode structures required for the capacitive switch.
  • Electrodes 14 have integrally formed contact tags 14 a which lead to a contacting block 16 a and 16 b , respectively, formed integrally on the inside of the housing body.
  • the contacting blocks 16 a, 16 b have cutouts into which the ends of the contact tags 14 a are positioned.
  • the contacting surfaces at the ends of the contact tags 14 a are arranged flush in the surface of the contacting blocks 16 a , 16 b. It can furthermore be seen in FIG. 2 that the electrode structures 14 have recessed windows 18 .
  • Cylindrical circuit board supports 20 are furthermore formed integrally on the inside of the housing body 10 .
  • a circuit board is placed onto the circuit board supports 20 .
  • the tracks of the circuit board 22 comprise contacting regions in a position opposite the contacting blocks 16 a, 16 b.
  • the connection of the electrode structures 14 with the circuit board is realized by intermediate conductive rubber elements.
  • the circuit board is equipped with the evaluation electronics of the capacitive switch.
  • the front side of the completed capacitive switch shown in FIG. 4 is provided with symbols which are associated with the available switching functions.
  • the symbols and letterings are cut out from a coat of paint by a laser beam. Due to the cutouts 12 , the material of the switch housing arranged underneath has a reduced wall thickness and is thus well translucent. Due to the light sources arranged on the circuit board 22 , in particular light-emitting diodes, the symbols are illuminated through the windows 18 in the electrode structures 14 from the inside of the switch housing.
  • a preferred plastic material for the electrically non-conductive first plastic component from which the housing body 10 is injected is polycarbonate.
  • a polycarbonate is also chosen for the second plastic component which has to be electrically conductive, however such a polycarbonate that is electrically conductive by the addition of carbon fibers.
  • Both plastic materials enter into an intimate connection due to the two-component injection molding process. With this method, it is also possible to produce the precise 3-D structures which are required to easily ensure a secure contacting of the electrode structures up to the circuit board in a mass production process.
  • the capacitive switch is well suitable for use in the automotive field due to its robustness, its absence of wear and its corrosion resistance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Manufacture Of Switches (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The switch housing for capacitive switches has an outer contact surface and flat electrode structures which are arranged on the inside and in a position opposite the contact surface and which are placed by two-component injection molding in recessed regions of the housing body injected from a first, electrically non-conductive plastic component by means of a second, electrically conductive plastic component. Preferably, both plastic components are a polycarbonate, the second plastic component containing carbon fibers.

Description

    RELATED APPLICATIONS
  • This application is a continuation of U.S. patent application Ser. No. 13/822,302, filed May 16, 2013 which is a National Phase filing of PCT/EP2011/065819, filed Sep. 13, 2011, which claims priority from German Application No. 10 2010 045 199.1 filed Sep. 13, 2010, the subject matter of which are incorporated herein by reference in their entirety.
    • BACKGROUND OF THE INVENTION
  • The invention relates to a method of producing a switch housing for capacitive switches, to a switch housing which has integrated electrically conductive electrode structures, and to a capacitive switch equipped with the switch housing.
  • Capacitive switches are in principle composed of a flat electrode on one side of a dielectric material layer, the face of which facing away therefrom forming a contact surface. Switch housings for capacitive switches are usually made of plastic material. The front face of the switch housing forms the contact surface, and the face opposite thereto on the inside of the switch housing supports an electrically conductive electrode structure. Such electrode structures can be applied as conductive layers onto the electrically non-conductive plastic material of the switch housing using a so-called conductive lacquer or other electrically conductive materials. Only thin layers can be applied by means of usual coating methods. The required electrode structures may have a complex shape so that specific coating methods are required. For the secure contacting of the electrode structures, precise 3-D structures are necessary which can only be obtained with difficulty with a coating method. For applications in the automotive field, conventional coating solutions are furthermore mechanically susceptible and prone to corrosion.
    • SUMMARY OF THE INVENTION
  • By the invention, a method of producing a switch housing for capacitive switches having a contact surface by two-component injection molding is provided. A housing body is first injected using a first, electrically insulating plastic component, the housing body having recessed regions on the inside in a position opposite the contact surface. A second, electrically conductive plastic component is then injected into the recessed regions, which contains the same base material as the first plastic component, a polycarbonate, for example. The conductivity of the second plastic component results from the addition of conductive particles such as carbon fibers. The structures injected using the electrically conductive plastic component may have any complexity and a sufficient thickness to ensure a high mechanical strength. The electrode structure thus realized enter into an intimate connection with the first, electrically non-conductive plastic component, as both plastic components have the same base material.
  • The switch housing for capacitive switches produced by the invention has an outer contact surface and flat electrode structures which are arranged on the inside in a position opposite the contact surface and which are placed by two-component injection molding in recessed regions of the housing body injected from a first, electrically non-conductive plastic component using a second, electrically conductive plastic component. Preferably, both plastic components are a polycarbonate, the second plastic component containing carbon fibers.
  • In the preferred embodiment, the flat electrode structures comprise recessed windows, and the contact surface is translucent opposite the recessed windows. The switch according to the invention equipped with this switch housing has symbols arranged on the contact surface of the switch housing which can be illuminated through the recessed windows of the electrode structures and through thinned wall regions of the switch housing.
  • In a further development of the invention, the flat electrode structures are configured with integrally formed contact tags which are guided to a contacting block formed integrally on the inside of the housing body. The contacting block has cutouts in which the ends of the contact tags are positioned and form flush contacting surfaces with the surface of the contacting block. It is therefore easily possible to contact the electrode structures with a circuit board arranged on top by a simple insertion of conductive rubber structures.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Further features and advantages of the invention will become apparent from the description below of an advantageous embodiment and from the drawings to which reference is made and which show:
  • FIG. 1 a perspective view of a switch housing prior to the incorporation of electrode structures;
  • FIG. 2 the switch housing with the electrode structures inserted;
  • FIG. 3 the switch housing with a circuit board placed thereon; and
  • FIG. 4 a perspective view of a capacitive switch produced using the switch housing.
    •  DESCRIPTION
  • The switch housing for a capacitive switch Is produced in a two-component injection molding process. FIG. 1 shows a generally cuboidal switch housing which is injected using a first, electrically non-conductive plastic component with a view to the inside. The end face of the switch housing generally denoted by 10, which is opposite the inside forms a contact surface of the capacitive switch. On the opposite inside, the corresponding wall is configured with flat cutouts 12. A second, electrically conductive plastic component is incorporated into these cutouts by two-component injection molding. The result is illustrated in FIG. 2. The structures injected using the second plastic component are electrically conductive and have the shape of the electrode structures required for the capacitive switch. These electrode structures 14 have integrally formed contact tags 14 a which lead to a contacting block 16 a and 16 b, respectively, formed integrally on the inside of the housing body. The contacting blocks 16 a, 16 b have cutouts into which the ends of the contact tags 14 a are positioned. The contacting surfaces at the ends of the contact tags 14 a are arranged flush in the surface of the contacting blocks 16 a, 16 b. It can furthermore be seen in FIG. 2 that the electrode structures 14 have recessed windows 18. Cylindrical circuit board supports 20 are furthermore formed integrally on the inside of the housing body 10.
  • In the mounted state shown in FIG. 3, a circuit board is placed onto the circuit board supports 20. The tracks of the circuit board 22 comprise contacting regions in a position opposite the contacting blocks 16 a, 16 b. The connection of the electrode structures 14 with the circuit board is realized by intermediate conductive rubber elements. The circuit board is equipped with the evaluation electronics of the capacitive switch.
  • The front side of the completed capacitive switch shown in FIG. 4 is provided with symbols which are associated with the available switching functions. The symbols and letterings are cut out from a coat of paint by a laser beam. Due to the cutouts 12, the material of the switch housing arranged underneath has a reduced wall thickness and is thus well translucent. Due to the light sources arranged on the circuit board 22, in particular light-emitting diodes, the symbols are illuminated through the windows 18 in the electrode structures 14 from the inside of the switch housing.
  • A preferred plastic material for the electrically non-conductive first plastic component from which the housing body 10 is injected is polycarbonate. A polycarbonate is also chosen for the second plastic component which has to be electrically conductive, however such a polycarbonate that is electrically conductive by the addition of carbon fibers. Both plastic materials enter into an intimate connection due to the two-component injection molding process. With this method, it is also possible to produce the precise 3-D structures which are required to easily ensure a secure contacting of the electrode structures up to the circuit board in a mass production process. The capacitive switch is well suitable for use in the automotive field due to its robustness, its absence of wear and its corrosion resistance.

Claims (18)

1. A method of producing a switch housing for capacitive switches having a contact surface by two-component injection molding, a housing body being injected using a first, electrically insulating plastic component, the housing body having recessed regions on the inside in a position opposite the contact surface, and a second, electrically conductive plastic component containing the same base material as the first plastic component being injected into the recessed regions.
2. The method according to claim 1, wherein both plastic components are a polycarbonate and the second plastic component contains carbon fibers.
3. The method according to claim 1, wherein electrode structures are integrally formed by injecting said second, electrically conductive plastic component.
4. A switch housing for capacitive switches, having an outer contact surface and flat electrode structures which are arranged on the inside in a position opposite the contact surface and which are placed by two-component injection molding in recessed regions of the housing body injected from a first electrically non-conductive plastic component by means of a second, electrically conductive plastic component, and wherein the flat electrode structures are configured with integrally formed contact tags which are guided to a contacting block formed integrally on the inside of the housing body
5. The switch housing according to claim 4, wherein both plastic components are a polycarbonate and the second plastic component contains carbon fibers.
8. The switch housing according to claim 4, wherein the flat electrode structures have recessed windows and the contact surface is translucent opposite the recessed windows.
7. The switch housing according to claim 4, wherein the flat electrode structures are configured with integrally formed contact tags which are guided to a contacting block formed integrally on the inside of the housing body.
8. The switch housing according to claim 7, wherein the contacting block has cutouts into which the ends of the contact tags are positioned and form flush contacting surfaces with the surface of the contacting block.
9. The switch housing according to claim 4, wherein cylindrical track supports are formed integrally with the housing body on the inside.
10. A capacitive switch having a switch housing according to claim 4, wherein a circuit board equipped with an evaluation electronics is arranged at the bottom of the switch housing and is electrically connected to the electrode structures.
11. The switch according to claim 10, wherein the circuit board is additionally equipped with luminous elements which illuminate symbols arranged on the contact surface of the switch housing through recessed windows of the electrode structures and through thinned wall regions of the switch housing.
12. The switch according to claim 10, wherein said circuit board comprises light sources that are configured to illuminate a back side of a front of said capacitive switch.
13. The switch according to claim 12, wherein said light sources are light-emitting diodes.
14. The switch according to claim 10, wherein a front of said capacitive switch is provided with symbols which are associated with the available switching functions wherein the symbols are illuminated from the inside of said switch housing.
15. The switch according to claim 14, wherein said symbols are illuminated through windows In said electrode structures.
16. The switch according to claim 10, wherein said electrode structures are configured such that they each surround a corresponding window configured to guide light.
17. The switch according to claim 16, wherein said electrode structures are allocated to capacitive switching portions corresponding to a dedicated switching function.
18. The switch according to claim 16, wherein said electrode structures are connected to a circuit board comprising evaluation electronics and light sources that are configured to radiate light, said light being guided through said window.
US15/627,487 2010-09-13 2017-06-20 Switch housing for capacitive switches Abandoned US20170282425A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/627,487 US20170282425A1 (en) 2010-09-13 2017-06-20 Switch housing for capacitive switches

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE201010045199 DE102010045199A1 (en) 2010-09-13 2010-09-13 Switch housing for capacitive switches
DE102010045199.1 2010-09-13
PCT/EP2011/065819 WO2012034994A1 (en) 2010-09-13 2011-09-13 Switch housing for capacitive switches
US201313822302A 2013-05-16 2013-05-16
US15/627,487 US20170282425A1 (en) 2010-09-13 2017-06-20 Switch housing for capacitive switches

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
US13/822,302 Continuation US9722603B2 (en) 2010-09-13 2011-09-13 Switch housing for capacitive switches
PCT/EP2011/065819 Continuation WO2012034994A1 (en) 2010-09-13 2011-09-13 Switch housing for capacitive switches

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US20170282425A1 true US20170282425A1 (en) 2017-10-05

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US13/822,302 Expired - Fee Related US9722603B2 (en) 2010-09-13 2011-09-13 Switch housing for capacitive switches
US15/627,487 Abandoned US20170282425A1 (en) 2010-09-13 2017-06-20 Switch housing for capacitive switches

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US (2) US9722603B2 (en)
EP (1) EP2617133B1 (en)
CN (1) CN103181081B (en)
DE (1) DE102010045199A1 (en)
WO (1) WO2012034994A1 (en)

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Also Published As

Publication number Publication date
EP2617133A1 (en) 2013-07-24
EP2617133B1 (en) 2018-03-28
CN103181081B (en) 2016-05-18
CN103181081A (en) 2013-06-26
US20130270926A1 (en) 2013-10-17
US9722603B2 (en) 2017-08-01
DE102010045199A1 (en) 2012-03-15
WO2012034994A1 (en) 2012-03-22

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