WO2003053120A1 - An electrically conductive gasket - Google Patents

An electrically conductive gasket Download PDF

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Publication number
WO2003053120A1
WO2003053120A1 PCT/FI2002/001020 FI0201020W WO03053120A1 WO 2003053120 A1 WO2003053120 A1 WO 2003053120A1 FI 0201020 W FI0201020 W FI 0201020W WO 03053120 A1 WO03053120 A1 WO 03053120A1
Authority
WO
WIPO (PCT)
Prior art keywords
gasket
electrically conductive
bulges
iso
spacer plate
Prior art date
Application number
PCT/FI2002/001020
Other languages
French (fr)
Inventor
Juha Laiho
Ari PAALIJÄRVI
Mikko Silvennoinen
Original Assignee
Perlos Oyj
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 Perlos Oyj filed Critical Perlos Oyj
Priority to AU2002350780A priority Critical patent/AU2002350780A1/en
Publication of WO2003053120A1 publication Critical patent/WO2003053120A1/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/0015—Gaskets or seals

Definitions

  • the present invention relates to an electrically conductive gasket which is arranged to isolate two surfaces from each other and which gasket is an element separate from the rest of the assembly.
  • the encapsulations and the electrically conductive structures are implemented by using coatings, gaskets and housings made of metal, metal/non-metal composites, organic composites, or organic materials.
  • the housings are coated with metal, and the electrical coupling of the housings is implemented, for example, by electrically conductive elastomers which are, for example, extruded or injection moulded onto a desired surface in a suitable way.
  • a so-called passive spacer plate or spacer structure is commonly used.
  • the spacer plate may be placed, for example, between two circuit boards or between a circuit board and another surface, such as the housing of the device.
  • the spacer plate is used as the carrier of a mechanical load, and it keeps the components to be electrically coupled to each other at a given distance from each other.
  • the electrical coupling and the sealing can be implemented, for example, in such a way that an electrically conductive elastomeric structure is integrated by injection moulding around the cross-section of the spacer plate carrying a load, or in its structures, to seal the compo- nents.
  • the sealing requires that a given surface pressure is achieved at the joint during the assembly.
  • the electrical coupling can also be implemented, for example, by coating a non-metal isolating spacer plate with metal and by installing electrically connectable components on its both sides.
  • the material of the spacer plate can be metal, or it can be coated with metal or be otherwise electrically conductive.
  • the elastomer can be extruded, fixed as separate sealing layers (by glueing or separately) onto the surface of the spacer plate.
  • the use of a dielectric material as the spacer plate means that the elastomeric material must form the conductive buses between the outer surfaces of the gasket, or the spacer plate must be equipped with electrically conductive buses between the outer surfaces (for example metal wires or the like), onto which a sealing elastomeric layer or layers are to be laid.
  • Publication WO 00/78518 discloses an elastic element comprising segments with the shape of a truncated cone which are connected to a basic component, such as a housing.
  • Publication WO 98/54942 discloses a housing comprising a serrated elastic gasket.
  • the elastic gasket can be attached to the housing for example by injection moulding.
  • Publication GB 2306790 discloses a housing which comprises a gasket having a bulged edge and being made of a compressible material.
  • the gasket is fixed to the housing in such a way that the groove of the gas- ket matches with a projecting part in the housing.
  • the gasket according to the invention is characterized in that the gasket consists completely of a homogeneous material whose surface is provided with bulges or ridges which are compressed when they are subjected to pressure.
  • the gasket according to the invention can be cast by conventional methods in a simple mould at low costs.
  • the material consumption and the work stages are reduced in the manufacturing process.
  • the raw material of the gasket can be easily recycled.
  • the gasket according to the invention having the function of coupling the structure electrically and to seal it, is made of a single material.
  • the outer surfaces of the gasket, which take care of sealing the structure, are completely formed to the finished shape in the manufacturing process, before or in connection with the assembly.
  • the gasket according to the invention is simultaneously used as both an electrically conductive gasket and a spacer plate carrying the mechanical load; in other words, a single component made of a homogeneous material can be used for both of these functions.
  • the homogeneous material means that the gasket, in all its parts, consists of the same material, but the material may comprise more than one polymer.
  • an electrically conductive substance may be blended and evenly dispersed in the material.
  • the homogene- ous material may be cast in a suitable way, preferably injection moulded, to form the gasket.
  • the outer surfaces of the gasket are designed in such a way that the whole area of the outer surface will not touch a component or another surface in contact with the gasket; in other words, the outer surface of the gasket is provided with bulges or ridges which touch the adjacent component and receive a mechanical load.
  • the bulges or ridges are compressed.
  • the bulges or ridges will reassume their almost original shape when the mechanical load is removed.
  • the bulges or ridges are reduced in their cross-sectional area in such a way that the cross-sectional area of the bulge is the smallest at the section which touches the adjacent component or another surface.
  • the design of the bulges is dependent on the elastic properties of the material of the gasket and on the use of the gasket. Furthermore, restrictions may be set on the structure of the gasket by the injection moulding tech- nique, if it is used.
  • the shape of the bulge may be, for example, a hemisphere, a truncated cone or a truncated pyramid.
  • the bulges are arrayed sufficiently densely so as to achieve the necessary contact between the gasket and the surfaces placed against it.
  • a ridge refers to at least one continuous bulge on the outer surface of the gasket, with its cross-sectional surface reducing towards the second surface.
  • the gasket can be used to achieve waterproofness or to attenuate oscillations.
  • the shape of the gasket may vary according to the use. The bulges or ridges are preferably provided on both sides of the gasket, but they can also be provided on one side of the gasket only.
  • the gasket can be made of an electrically conductive elastic material, normally an elastomeric material, whose hardness can be measured on the Shore A scale (SFS-ISO 868:E).
  • the elastomeric material can be a thermoplastic elastomer or rubber. Feasible materials include, for example, polyurethane and silicone rubber.
  • the elastomeric material may be made of several different elastomeric materials to form a homogeneous blend.
  • the elastomeric material is blended with an electrically conductive substance, such as a metal, carbon, or conductive polymers.
  • the conductive substance may be, for example, in the form of particles or fibres.
  • the material should be castable by a low- pressure casting technique required by thermosetting plastics and/or thermoplastics, or alternatively by an injection moulding technique.
  • the gasket can be used in electronic devices, particularly in portable electronic devices, such as mobile stations, and in uses which require an earth connection, a protection from radio frequency (RF) radiation, electromagnetic interference (EMI), and/or static electricity (ESD).
  • the gasket is used, for example, between components of electronic devices to form the necessary, electrical contact between the surfaces and simultaneously to seal the structure.
  • the component may be, for example, a circuit board.
  • the gasket can also be used in devices comprising components between which an undesired difference of potential can develop and. be levelled out by means of the electrically conductive gasket.
  • the gasket according to the invention may be used to separate two circuit boards from each other.
  • the gasket is placed between the circuit boards, and the necessary compression between the circuit boards is achieved, for example, by means of a screw connection, wherein the bulges or ridges of the gasket are compressed and form a reliable electrical contact between the circuit boards.
  • gasket according to the invention is used to connect the cover of the mobile station, or a part of the cover, and a device component inside the cover, electrically to each other. There is thus electrical conductivity in the material inside the cover of the mobile station.
  • FIG. 1 shows a gasket according to the invention in a top view
  • Figs. 2 and 3 show some applications of using the gasket in cross- sectional views.
  • Figure 1 shows a gasket 1 according to the invention.
  • the gasket 1 comprises, at suitable intervals, bulges 5 which protrude from the plane and may have the shape of, for example, a hemisphere, a truncated cone or a truncated pyramid.
  • bulges 5 When the bulge 5 is pressed against another counter-surface, its surface area touching the counter-surface is advantageously increased.
  • Figure 2 shows an application for using the gasket 1.
  • Figure 2 shows the mirror-symmetrical structure of the gasket in relation to its planar section, wherein both surface of the gasket 1 are provided with bulges 5 protruding from the planes L1 and L2 of the surface of the gasket 1.
  • the gasket 1 is pressed between the circuit boards 3 in such a way that the bulges 5 are compressed and form a good contact with circuit boards 3. Because the gasket 1 is made of an electrically conductive material, an electrical contact is formed between the circuit boards 3.
  • Figure 3 shows another application for using the gasket 1.
  • the gasket 1 is placed between the circuit board 3 and the housing 4 of the device.
  • the gasket 1 is pressed between the surfaces to be sealed, that is, in this case, between the circuit board 3 and the housing 4.
  • a gasket according to Fig. 1 was made by injection moulding.
  • the material used was Pre-Elec PE 1304 (Premix Oy, Finland). This mate- rial is a mixture of PE-LE and PE-LLD. Electrical conductivity is achieved by means of carbon particles. Typical properties of the material include the following: Property (and testing method) Value
  • a gasket according to Fig.1 was made by injection moulding.
  • the material used was Pre-Elec CP 1318 (PremixOy, Finland).
  • This mate- rial is a polyolefin copolymer. Electrical conductivity is achieved by means of carbon particles. Typical properties of the material include the following:
  • the above description does not restrict the invention, but the invention may vary within the scope of the claims.
  • the shape of the gasket according to the invention, and the materials to be used, are determined according to the use.
  • the main idea in this invention is that the gasket can be made in one piece which, however, may act both as a carrier of mechanical load and as a component for sealing the struc- ture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

An electrically conductive gasket (1) is arranged to isolate two surfaces from each other. The gasket (1) is a component separate from the rest of the assembly. The gasket (1) completely consists of a homogeneous material whose surface is provided with bulges (5) or ridges which are compressed when they are subjected to pressure.

Description

An electrically conductive gasket
The present invention relates to an electrically conductive gasket which is arranged to isolate two surfaces from each other and which gasket is an element separate from the rest of the assembly.
The trouble-proof operation of active components, such as circuit boards, of electronic devices, for example mobile phones, requires that the components are protected from external noise factors which are of the electromagnetic nature and/or caused by oscillation. Furthermore, for example certain components of mobile phones are isolated from each other and the radio frequency radiation caused by them is directed by various solutions. In practice, this means encapsulations and tight electrically conductive structures. Requirements of large-scale serial production include cost-efficiency, controllability of the technical implementation, as well as the recyclability of the devices and their components.
The encapsulations and the electrically conductive structures are implemented by using coatings, gaskets and housings made of metal, metal/non-metal composites, organic composites, or organic materials. The housings are coated with metal, and the electrical coupling of the housings is implemented, for example, by electrically conductive elastomers which are, for example, extruded or injection moulded onto a desired surface in a suitable way.
In structures which should have electrical conductivity and sealing between two or more elements, a so-called passive spacer plate or spacer structure is commonly used. The spacer plate may be placed, for example, between two circuit boards or between a circuit board and another surface, such as the housing of the device. The spacer plate is used as the carrier of a mechanical load, and it keeps the components to be electrically coupled to each other at a given distance from each other. The electrical coupling and the sealing can be implemented, for example, in such a way that an electrically conductive elastomeric structure is integrated by injection moulding around the cross-section of the spacer plate carrying a load, or in its structures, to seal the compo- nents. The sealing requires that a given surface pressure is achieved at the joint during the assembly.
The electrical coupling can also be implemented, for example, by coating a non-metal isolating spacer plate with metal and by installing electrically connectable components on its both sides.
The material of the spacer plate can be metal, or it can be coated with metal or be otherwise electrically conductive. Thus, the elastomer can be extruded, fixed as separate sealing layers (by glueing or separately) onto the surface of the spacer plate. The use of a dielectric material as the spacer plate means that the elastomeric material must form the conductive buses between the outer surfaces of the gasket, or the spacer plate must be equipped with electrically conductive buses between the outer surfaces (for example metal wires or the like), onto which a sealing elastomeric layer or layers are to be laid.
For the mass production of electronic devices, simple functional solutions must be applied to keep the manufacturing costs at a reasonable level. Furthermore, the tightening environmental and recycling regulations require that the products can be broken down and the raw material flows are controlled in a cost-efficient way.
In modern applications of electronic devices, such as mobile stations or corresponding devices, at least two separate materials are used in the implementation of various spacer plate solutions inside the housing: one is the material of the spacer plate body, carrying the mechanical load, and the other is the gasket material. The materials may naturally be composite materials each. Combining them by injection moulding, for example by n-composite techniques, means that the materials are bonded to each other in such a way that it will be impossible to release them upon disassembly. The situation will be the same if the extrusion technique is used, in which a gasket material consisting of one or more components is attached to the outer surface or onto the spacer plate by chemical and/or mechanipal bonds. Furthermore, the integration of the gasket in the rest of the structure will require, among other things, complex mould structures. Prior art is represented e.g. by the following references:
Publication WO 00/78518 discloses an elastic element comprising segments with the shape of a truncated cone which are connected to a basic component, such as a housing.
Publication WO 98/54942 discloses a housing comprising a serrated elastic gasket. The elastic gasket can be attached to the housing for example by injection moulding.
Publication GB 2306790 discloses a housing which comprises a gasket having a bulged edge and being made of a compressible material. The gasket is fixed to the housing in such a way that the groove of the gas- ket matches with a projecting part in the housing.
An improvement to prior art is achieved with the structure according to the invention. The gasket according to the invention is characterized in that the gasket consists completely of a homogeneous material whose surface is provided with bulges or ridges which are compressed when they are subjected to pressure.
The gasket according to the invention can be cast by conventional methods in a simple mould at low costs. The material consumption and the work stages are reduced in the manufacturing process. The raw material of the gasket can be easily recycled.
The gasket according to the invention, having the function of coupling the structure electrically and to seal it, is made of a single material. The outer surfaces of the gasket, which take care of sealing the structure, are completely formed to the finished shape in the manufacturing process, before or in connection with the assembly.
The gasket according to the invention is simultaneously used as both an electrically conductive gasket and a spacer plate carrying the mechanical load; in other words, a single component made of a homogeneous material can be used for both of these functions. In this con- text, the homogeneous material means that the gasket, in all its parts, consists of the same material, but the material may comprise more than one polymer. Furthermore, an electrically conductive substance may be blended and evenly dispersed in the material. The homogene- ous material may be cast in a suitable way, preferably injection moulded, to form the gasket. The outer surfaces of the gasket are designed in such a way that the whole area of the outer surface will not touch a component or another surface in contact with the gasket; in other words, the outer surface of the gasket is provided with bulges or ridges which touch the adjacent component and receive a mechanical load. By the effect of the mechanical loading, the bulges or ridges are compressed. However, the bulges or ridges will reassume their almost original shape when the mechanical load is removed. Preferably, the bulges or ridges are reduced in their cross-sectional area in such a way that the cross-sectional area of the bulge is the smallest at the section which touches the adjacent component or another surface. The design of the bulges is dependent on the elastic properties of the material of the gasket and on the use of the gasket. Furthermore, restrictions may be set on the structure of the gasket by the injection moulding tech- nique, if it is used. The shape of the bulge may be, for example, a hemisphere, a truncated cone or a truncated pyramid. The bulges are arrayed sufficiently densely so as to achieve the necessary contact between the gasket and the surfaces placed against it. In this context, a ridge refers to at least one continuous bulge on the outer surface of the gasket, with its cross-sectional surface reducing towards the second surface. It is also possible that by the selection of a suitable structure, the gasket can be used to achieve waterproofness or to attenuate oscillations. Furthermore, the shape of the gasket may vary according to the use. The bulges or ridges are preferably provided on both sides of the gasket, but they can also be provided on one side of the gasket only.
The gasket can be made of an electrically conductive elastic material, normally an elastomeric material, whose hardness can be measured on the Shore A scale (SFS-ISO 868:E). The elastomeric material can be a thermoplastic elastomer or rubber. Feasible materials include, for example, polyurethane and silicone rubber. The elastomeric material may be made of several different elastomeric materials to form a homogeneous blend. The elastomeric material is blended with an electrically conductive substance, such as a metal, carbon, or conductive polymers. The conductive substance may be, for example, in the form of particles or fibres. The material should be castable by a low- pressure casting technique required by thermosetting plastics and/or thermoplastics, or alternatively by an injection moulding technique.
The gasket can be used in electronic devices, particularly in portable electronic devices, such as mobile stations, and in uses which require an earth connection, a protection from radio frequency (RF) radiation, electromagnetic interference (EMI), and/or static electricity (ESD). The gasket is used, for example, between components of electronic devices to form the necessary, electrical contact between the surfaces and simultaneously to seal the structure. The component may be, for example, a circuit board. By means of the gasket, the component may also be in an electrical contact with another surface, such as the housing of the electronic device. The gasket can also be used in devices comprising components between which an undesired difference of potential can develop and. be levelled out by means of the electrically conductive gasket.
In mobile stations, the gasket according to the invention may be used to separate two circuit boards from each other. The gasket is placed between the circuit boards, and the necessary compression between the circuit boards is achieved, for example, by means of a screw connection, wherein the bulges or ridges of the gasket are compressed and form a reliable electrical contact between the circuit boards.
Another application in mobile stations is that the gasket according to the invention is used to connect the cover of the mobile station, or a part of the cover, and a device component inside the cover, electrically to each other. There is thus electrical conductivity in the material inside the cover of the mobile station.
In the following, the invention will be described by means of the appended drawings and the examples. In the drawings, Fig. 1 shows a gasket according to the invention in a top view, and
Figs. 2 and 3 show some applications of using the gasket in cross- sectional views.
Figure 1 shows a gasket 1 according to the invention. The gasket 1 comprises, at suitable intervals, bulges 5 which protrude from the plane and may have the shape of, for example, a hemisphere, a truncated cone or a truncated pyramid. When the bulge 5 is pressed against another counter-surface, its surface area touching the counter-surface is advantageously increased.
Figure 2 shows an application for using the gasket 1. Figure 2 shows the mirror-symmetrical structure of the gasket in relation to its planar section, wherein both surface of the gasket 1 are provided with bulges 5 protruding from the planes L1 and L2 of the surface of the gasket 1. The gasket 1 is pressed between the circuit boards 3 in such a way that the bulges 5 are compressed and form a good contact with circuit boards 3. Because the gasket 1 is made of an electrically conductive material, an electrical contact is formed between the circuit boards 3.
Figure 3 shows another application for using the gasket 1. The gasket 1 is placed between the circuit board 3 and the housing 4 of the device. As in the case of the preceding figure, also here the gasket 1 is pressed between the surfaces to be sealed, that is, in this case, between the circuit board 3 and the housing 4.
Example 1
A gasket according to Fig. 1 was made by injection moulding. The material used was Pre-Elec PE 1304 (Premix Oy, Finland). This mate- rial is a mixture of PE-LE and PE-LLD. Electrical conductivity is achieved by means of carbon particles. Typical properties of the material include the following: Property (and testing method) Value
Specific weight 1.01 g/cm3
Cast flow (ISO 1133)
-190°C/2.16kg 0.3g/10min
-190°C/5.0kg 1.5g/10 min
Tensile strength (ISO 527)
- machine direction 22MPa
- cross-machine direction 22MPa
Yield limit (ISO 527)
- machine direction 15MPa
- cross-machine direction 13MPa
Elongation at break (ISO 527)
- machine direction 540 %
- cross-machine direction 540 %
Elongation at yield strain (ISO 527)
- machine direction 15%
- cross-machine direction 9%
Surface resistivity (ISO D-257) <105Ω
Example 2.
A gasket according to Fig.1 was made by injection moulding. The material used was Pre-Elec CP 1318 (PremixOy, Finland). This mate- rial is a polyolefin copolymer. Electrical conductivity is achieved by means of carbon particles. Typical properties of the material include the following:
Property (and testing method) Value
Specific weight 1.10 g/cm3
Cast flow (ISO 1133)
-190°C/2.16kg 1 g/10 min
-190°C/5.0kg 26g/10min
Tensile strength (ISO 527) 19MPa
Elongation at break (ISO 527) 500 %
Surface resistivity (ISO D-257) <105Ω
Hardness (ISO 868) - Shore A 94
- Shore D 46
The above description does not restrict the invention, but the invention may vary within the scope of the claims. The shape of the gasket according to the invention, and the materials to be used, are determined according to the use. The main idea in this invention is that the gasket can be made in one piece which, however, may act both as a carrier of mechanical load and as a component for sealing the struc- ture.

Claims

Claims:
1. An electrically conductive gasket (1) which is arranged to separate two surfaces from each other and which gasket (1) is an element sepa- rate from the rest of the assembly, characterized in that the gasket (1) completely consists of a homogeneous material whose surface is provided with bulges (5) or ridges which are compressed when they are subjected to pressure.
2. The gasket according to claim 1 , characterized in that it is made of an elastic material.
3. The gasket according to claim 1 or 2, characterized in that the elastic material is blended with an electrically conductive substance.
4. The gasket according to any of the preceding claims, characterized in that the gasket (1) is injection moulded.
5. The gasket according to any of the preceding claims, characterized in that the gasket (1) is placed between circuit boards (3) in a mobile station.
6. The gasket according to any of the preceding claims, characterized in that it is a gasket (1) placed between the cover of a mobile station, or a part of it, and a device component inside the cover.
PCT/FI2002/001020 2001-12-19 2002-12-13 An electrically conductive gasket WO2003053120A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002350780A AU2002350780A1 (en) 2001-12-19 2002-12-13 An electrically conductive gasket

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20012507 2001-12-19
FI20012507A FI20012507A (en) 2001-12-19 2001-12-19 Conductive seal

Publications (1)

Publication Number Publication Date
WO2003053120A1 true WO2003053120A1 (en) 2003-06-26

Family

ID=8562518

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2002/001020 WO2003053120A1 (en) 2001-12-19 2002-12-13 An electrically conductive gasket

Country Status (3)

Country Link
AU (1) AU2002350780A1 (en)
FI (1) FI20012507A (en)
WO (1) WO2003053120A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2306790A (en) * 1995-10-28 1997-05-07 Motorola Ltd Gasket for electric field isolation
JPH10117089A (en) * 1996-10-15 1998-05-06 Kitagawa Ind Co Ltd Electromagnetic wave shielding material
US6426881B1 (en) * 2000-10-04 2002-07-30 Arthur A. Kurz Shielding arrangement for inter-component shielding in electronic devices
US6451374B1 (en) * 2000-02-18 2002-09-17 Parker-Hannifin Corporation Manufacture of low closure force, form-in-place EMI shielding gasket
US20020129953A1 (en) * 2001-03-13 2002-09-19 Miska Stanley R. Abrasion resistant conductive film and gasket

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2306790A (en) * 1995-10-28 1997-05-07 Motorola Ltd Gasket for electric field isolation
JPH10117089A (en) * 1996-10-15 1998-05-06 Kitagawa Ind Co Ltd Electromagnetic wave shielding material
US6451374B1 (en) * 2000-02-18 2002-09-17 Parker-Hannifin Corporation Manufacture of low closure force, form-in-place EMI shielding gasket
US6426881B1 (en) * 2000-10-04 2002-07-30 Arthur A. Kurz Shielding arrangement for inter-component shielding in electronic devices
US20020129953A1 (en) * 2001-03-13 2002-09-19 Miska Stanley R. Abrasion resistant conductive film and gasket

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 10 31 August 1998 (1998-08-31) *

Also Published As

Publication number Publication date
FI20012507A0 (en) 2001-12-19
FI20012507A (en) 2003-06-20
AU2002350780A1 (en) 2003-06-30

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