DK174327B1

DK174327B1 - Adapter for light emitter used in display, has pins which connect with respective conductive layers of display, while mounting adapter on drilled aperture

Info

Publication number: DK174327B1
Application number: DK200101213A
Authority: DK
Inventors: Thomas Harrit; Nicolaj Soerensen
Original assignee: Didriksen Torben
Priority date: 2001-08-13
Filing date: 2001-08-13
Publication date: 2002-12-09
Also published as: DK200101213A

Abstract

The adapter (1) is mounted on a drilled aperture (3) in the sandwich board (4) having a core (11) of electrically insulating material. The pins (6,9) of the adapter, contact with respective electrically conductive layers (7,10) of a display, while mounting the adapter on the aperture. An independent claim is also included for usage method of adapter for light emitter.

Description

DK 174327 B1DK 174327 B1

Den foreliggende opfindelse angår en adaptor til lysgiver for montage i en udfiræsning i en sandwichplade samt anvendelse af en sådan adaptor for dannelse af et ønsket billede.The present invention relates to an adapter for light emitter for mounting in a cutout in a sandwich plate and to use such an adapter to form a desired image.

5 Det er almindeligt at fremstille lysskilte, hvor der er monteret et antal lysgivere på skiltet. Lysgiveme er placeret, så de udformer den form eller den tekst skiltet skal udstråle. Lysgiveme forsynes med spænding med en række ledninger, da hver lysgiver skal forbindes til spændingsforsyning individuelt. Antallet af ledninger kan derfor blive stort, hvilket bevirker en forholdsvis dyr produktionspris og giver problemer med at 10 fremstille tynde skilte.5 It is common to make light signs where a number of light emitters are mounted on the sign. The light sources are positioned so that they form the shape or text that the sign must radiate. The light emitters are supplied with voltage with a number of wires, as each light emitter must be connected to the power supply individually. The number of wires can therefore be large, which results in a relatively expensive production price and causes problems in making thin signs.

I SE834679-7 er anvist en anordning til montering af lysdioder i en plade. Lysdioden monteres i en reflektordel der presses delvist gennem pladen og låses på bagsiden med en låsedel. Låsedelen har ben, der har elektrisk forbindlese med diodens ben. Benene 15 rager ud på låsedelen, og skal efterfølgende forbindes med ledninger til spændingsfor syning. Denne anordning kræver også individuel ledningsføring til hver lysdiode monteret i pladen, hvilket medfører de ovenfomævnte ulemper.SE834679-7 discloses a device for mounting LEDs in a plate. The LED is mounted in a reflector part which is partially pushed through the plate and locked on the back with a locking part. The locking member has pins which are electrically connected to the diode's legs. The legs 15 protrude on the locking part and must subsequently be connected with power supply wires. This device also requires individual wiring for each LED mounted in the plate, which causes the aforementioned disadvantages.

Alternativt fremstilles skiltene med lysledere, der er forbundet med en eller flere eksterne lysgivere. Ved denne type skilte, skal der føres et stort antal lysledere, hvilket 20 bevirker de samme ulemper som nævnt ovenfor.Alternatively, the signs are made with light conductors connected to one or more external light sources. For this type of sign, a large number of light conductors must be provided, causing the same disadvantages as mentioned above.

Det er formålet med opfindelsen på en nem måde at montere og vedligeholde lysgivere monteret i et plan, at mindske behovet for ledningsføring og gøre det lettere at fremstille tynde skilte.The object of the invention is in an easy way to install and maintain light emitters mounted in a plane, to reduce the need for wiring and to make thin signs easier.

2525

Det sker ved at anvise en adaptor til mindst en lysgiver for montage i en udfræsning i en sandwichplade der omfatter en kerne af elektrisk isolerende materiale og et lag af elektrisk ledende materiale på hver side af kernen, hvorhos udfræsningen går helt eller delvist gennem sandwichpladen, hvilken adaptor omfatter et eller flere første ben, der 30 er tilpasset til ved montage i udfræsningen at etablere elektrisk forbindelse med det ene lag, og et eller flere andre ben der er tilpasset til ved montage i en udfræsningen at etablere elektrisk forbindelse med det andet lag.This is accomplished by providing an adapter for at least one light source for mounting in a cutout in a sandwich plate comprising a core of electrically insulating material and a layer of electrically conductive material on each side of the core, the milling passing through the sandwich plate in whole or in part. adapter includes one or more first pins adapted to establish electrical connection with the one layer by mounting in the cutter, and one or more other pins adapted to establish electrical connection with the second layer by mounting in the cutter.

2 DK 174327 B12 DK 174327 B1

Med anvendelse af adaptoren ifølge opfindelsen kan flere lysgivere monteres i vilkårlige mønstre på en sandwichplade. Det kræver blot, at sandwichpladen forsynes med udfræsninger de steder, hvor der ønskes lysgivere placeret. Lysgiveme tændes ved at påtrykke sandwichpladens lag af elektrisk ledende materiale en spændingsforskel der 5 passer til lysgiveren.Using the adapter of the invention, multiple light emitters can be mounted in any pattern on a sandwich plate. It simply requires the sandwich plate to be machined where light sensors are desired. The light emitters are switched on by applying a voltage difference corresponding to the light emitter to the sandwich plate layer of electrically conductive material.

Med anvendelsen af adaptoren ifølge opfindelsen kan sandwichpladen kan anvendes til skilte, men kan også benyttes til belysning. En sandwichplade kan f.eks. ophænges i loftet som “stjenehimmel” 10 I det følgende vil opfindelsen blive beskrevet i flere detaljer under henvisning til figurer, hvor fig. 1 viser et tværsnit af en udførselsform af adaptoren monteret på sandwichpladen, 15 fig. 2 viser for en udførselsform af adaptoren dennes enkeltdele, fig. 3 viser en udførselsform af adaptoren set nedefra, fig. 4 viser en udførselsform af adaptoren monteret i sandwichplade fig. 5 viser en sandwichplade med udfræsninger til flere adaptorer fig. 6 viser en sandwichplade med flere adaptorer, 20 fig. 7 viser flere adaptore monteret i en sandwichplade med flere elektrisk adskilte segmenter, fig. 8 viser en udførselsform af adaptoren i perspektiv-tværsnit, fig. 9 viser samme udførselsform som i fig. 8 i tværsnit, fig. 10 viser samme udførselsform som i fig. 8 set nedefra og 25 fig. 11 viser samme udførselsform som i fig. 8 set fra siden.With the use of the adapter according to the invention, the sandwich plate can be used for signs, but can also be used for lighting. A sandwich plate can e.g. 10 In the following, the invention will be described in more detail with reference to figures, in which fig. 1 is a cross-sectional view of one embodiment of the adapter mounted on the sandwich plate; FIG. 2 shows, for an embodiment of the adapter, its individual parts; FIG. 3 is a bottom view of an embodiment of the adapter; FIG. 4 shows an embodiment of the adapter mounted in sandwich plate fig. 5 shows a sandwich plate with cutters for several adapters; FIG. 6 shows a sandwich plate with several adapters; FIG. 7 shows several adapters mounted in a sandwich plate with several electrically separated segments; FIG. Figure 8 shows an embodiment of the adapter in perspective cross-section; 9 shows the same embodiment as in FIG. 8 in cross-section, FIG. 10 shows the same embodiment as in FIG. 8 is a bottom view and FIG. 11 shows the same embodiment as in FIG. 8 from the side.

På figurerne er lysgiveren en diode, hvorfor første ben vil blive benævnt anodeben, og andre ben vil blive benævt katodeben. Anvendelse af dioder er særlig hensigtsmæssig når der skal anvendes lave spændinger og lav effekt. Lysgiveren kan også være en 30 glødepære, et neonrør, der eventuelt kan være bøjet, en samling af flere dioder eller anden kendt elektrisk lysgiver. Adaptoren kan også omfatte anden elektronik end en diode. Der kan f.eks. være monteret en formodstand for dioden eller anden elektronik til at beskytte dioden mod overspænding eller på anden vis styre diodens strømfor- 3 DK 174327 B1 brug. Den anviste adaptor kan også anvendes til andre elektriske anordninger, f.eks. en motor.In the figures, the light emitter is a diode, which is why the first leg will be called anode leg and second leg will be called cathode leg. The use of diodes is particularly useful when using low voltages and low power. The light emitter may also be an incandescent bulb, a neon tube that may be bent, a collection of several diodes, or other known electric light emitter. The adapter may also include electronics other than a diode. For example, be fitted a pre-resistor for the diode or other electronics to protect the diode from overvoltage or otherwise control the diode's current use 3 DK 174327 B1. The designated adapter may also be used for other electrical devices, e.g. an engine.

På figur 1 ses adapteren 1 hvori lysgiveren, her en diode 2, er fastgjort. Adapteren 1 er 5 monteret i en udfræsning 3 i sandwichpladen 4. Diodens anodeterminal 5 er forbundet til den ene ende på et anodeben 6, og diodens katodeterminal 8 er forbundet til den ene ende på et katodeben 9. Anodebenets 6 anden ende er i elektrisk forbindelse med skiltets ene lag 7 af elektrisk ledende materiale, og katodebenets 9 anden ende er i elektrisk forbindelse med skiltets andet lag 10 af elektrisk ledende materiale.Figure 1 shows the adapter 1 in which the light emitter, here a diode 2, is attached. The adapter 1 is mounted in a cutout 3 in the sandwich plate 4. The anode terminal 5 of the diode is connected to one end of anode leg 6 and the cathode terminal 8 of the diode is connected to one end of a cathode leg 9. The other end of the anode leg 6 is in electrical connection. with the one layer 7 of electrically conductive material and the other end of the cathode leg 9 being in electrical communication with the second layer 10 of the electrically conductive material.

1010

Det er også muligt at montere dioden med modsat polaritet, således at anode- og katode-ben bytter funktion. Flere adapterer kan monteres med forskellig polaritet i samme sandwichplade Herved kan dioderne styres i to grupper. Det gør det muligt lade de to grupper blinke eller at tænde begge grupper ved at påtrykke vekselspænding med hen-15 holdsvis lav og høj frekvens, at tænde den ene eller anden gruppe afhængig af den påtrykte spændings polaritet eller at have forskellig lysstyrke i de to grupper ved at variere pulsbredden i en påtrykt vekselspænding.It is also possible to mount the diode of opposite polarity so that the anode and cathode pins change function. Several adapters can be mounted with different polarity in the same sandwich plate. The diodes can be controlled in two groups. It allows the two groups to flash or to turn on both groups by applying alternating voltage of relatively low and high frequency, to turn on either group depending on the polarity of the applied voltage or to have different brightness in the two groups. by varying the pulse width in an applied alternating voltage.

Adapteren 1 og dioden 2 kan kan være fremstillet som en integreret enhed, eller dio-20 den 2 kan være fastgjort i adapteren 1 på med almindelige kendte teknikker, f.eks. limning, lodning eller prespasning. Den elektriske forbindelse mellem dioden 2 og anodebenet 6 og katodebenet 9 kan være opnået med almindelige kendte teknikker, f.eks. limning, lodning eller prespasning. I den viste udførselsform er adapteren 1 fastgjort ved prespasning, hvorved anodebenet 6 og katodebenet 9 er presset ind i lagene 25 7, 10 af elektrisk ledende materiale. Adaptoren 1 kan være fastgjort i udfræsningen 3 med almindelige kendte teknikker, f.eks. prespasning, limning eller med en overliggende plastfolie. Fastgørelsen med et plastfolie, der fortrinsvist er transparant, giver nem adgang for demontage og evt. udskiftning af lysgiver. Da plastfolien også beskytter mod fugtindtrængning, kan anvendelsen af plastfolie finde sted selvom adaptoren 1 30 er fastgjort i udfræsningen 3 med en anden teknik. Alternativt kan adoptoren beskyttes mod fugtindtrængning med lak.The adapter 1 and the diode 2 may be manufactured as an integrated unit, or the diode 2 may be attached to the adapter 1 by conventional techniques, e.g. gluing, soldering or pressing fit. The electrical connection between the diode 2 and the anode leg 6 and the cathode leg 9 can be obtained by common techniques known in the art, e.g. gluing, soldering or pressing fit. In the embodiment shown, the adapter 1 is secured by a press fit, whereby the anode leg 6 and the cathode leg 9 are pressed into the layers 25 7, 10 of electrically conductive material. The adapter 1 may be attached to the cutter 3 by common known techniques, e.g. pressing, bonding or with an overlying plastic wrap. The fastening with a plastic film, which is preferably transparent, provides easy access for disassembly and possibly replacement of light emitter. Since the plastic foil also protects against moisture penetration, the use of plastic foil can take place even if the adapter 1 30 is fixed in the milling 3 by another technique. Alternatively, the adapter can be protected from moisture penetration with varnish.

4 DK 174327 B14 DK 174327 B1

Sandwichpladen 4 , der består af de to lag 7,10 af elektrisk ledende materiale og en elektrisk isolerende kerne 11, er kendt teknik. Den elektriske isolator 11 kan f.eks. bestå af polyethylen, pvc eller nylon i en tykkelse på 4-25mm. Lagene 7,10 kan f.eks. bestå af aluminium, kobber, sølv eller guld i en tykkelse på 0,5-10 mm. Med dimensi-5 oner i de foreslåede intervaller, vil det være muligt at forsyne lysdioder i 500 adaptorer i en plade på 1 kvadratmeter. Isolatoren, 11, såvel som lagene af elektrisk ledende materiale 7,10 kan også bestå af et gennemsigtigt materiale, hvilket vil være en fordel ved betragtning af sandwichpladen bagfra.The sandwich plate 4, consisting of the two layers 7,10 of electrically conductive material and an electrically insulating core 11, is known in the art. The electrical insulator 11 can e.g. consist of polyethylene, PVC or nylon in a thickness of 4-25mm. The layers 7,10 may e.g. consist of aluminum, copper, silver or gold with a thickness of 0.5-10 mm. With dimensions in the suggested ranges, it will be possible to supply LEDs in 500 adapters in a 1 square meter plate. The insulator, 11, as well as the layers of electrically conductive material 7,10 may also consist of a transparent material, which will be an advantage in view of the sandwich plate from behind.

10 På figur 2 viser en anden udførselsform af adaptoren, hvor adoptorens enkelte dele er vist særskilt sammen med en diode. Øverst ses dioden 2 med anodeterminaleme 5,5’ og katodeterminaleme 8,8’ der ved samling etablerer elektrisk forbindelse med anodebenene 6 og katodebenene 9 og indfattes af adoptorhuset 12. Anodebenene 6 og katodebenene 9 kan med fordel støbes sammen med adoptorhuset 12. Adoptorhuset 12 er 15 forsynet med en krave 13, der kan omfatte midler til sikring mod fugtindtræning, f.eks. en o-ring eller anden pakning.Figure 2 shows another embodiment of the adapter, wherein the individual portions of the adapter are shown separately with a diode. At the top, the diode 2 is seen with the anode terminals 5.5 'and the cathode terminals 8,8' which by assembly establish electrical connection with the anode legs 6 and cathode legs 9 and are enclosed by the adapter housing 12. The anode legs 6 and cathode legs 9 can advantageously be cast together with the adapter housing 12. The adapter housing 12 is provided with a collar 13 which may comprise means for safeguarding moisture entry, e.g. an o-ring or other gasket.

På figur 3 ses adaptoren 1 nedefra. Adaptorhusets 12 diameter er ca. 13 mm, og kravens 13 diameter er ca. 16 mm, men kan have andre størrelse afhængig af den diode, 20 adaptoren skal anvendes til. Den del af anodebenet 6 og katodebenet 9 der stikker udenfor adaptorhuset vil ved montage i en udfræsning i en sandwichplade blive presset ind i sandwichpladens lag af elektrisk ledende materiale, og vil derved etablere elektrisk forbindelse hermed. 1 2 3 4 5 6 På figur 4 ses adaptoren 1 monteret i en sandwichplade 4. I den viste udførsesform er 2 udffæsningen foretaget i hele sandwichpladens tykkelse. Katodebenet 9 er presset ind 3 til i ene lag 10 af elektrisk ledende materiale. Isolatoren, 11, såvel som lagene 7,10 af 4 elektrisk ledende materiale kan bestå af et gennemsigtigt materiale, hvilket vil være en 5 fordel ved betragtning af sandwichpladen bagfra. I en yderligere udførselsform af op- 6 findelsen er adaptoren tilpasset montage af mindst to modsatrettede lysgivere. Herved bliver lysgivere placeret på begge sider af adaptoren så der blive lys på begge sider af sandwichpladen, hvilket forbedrer muligheden for at udbenytte begge sider af sandwichpladen til belysning eller signalering.Figure 3 shows the adapter 1 from below. The diameter of the adapter housing 12 is approx. 13 mm and the diameter of the collar 13 is approx. 16 mm, but may be different size depending on the diode to which the adapter is to be used. The portion of the anode leg 6 and cathode leg 9 protruding outside the adapter housing will, when mounted in a cut-out in a sandwich plate, be pressed into the sandwich plate layer of electrically conductive material, thereby establishing electrical connection therewith. 1 2 3 4 5 6 Figure 4 shows the adapter 1 mounted in a sandwich plate 4. In the embodiment shown, 2 the cutout is made in the entire thickness of the sandwich plate. The cathode leg 9 is pressed 3 into one layer 10 of electrically conductive material. The insulator, 11, as well as the layers 7, 10 of 4 electrically conductive material may consist of a transparent material, which will be an advantage in view of the sandwich plate from behind. In a further embodiment of the invention, the adapter is adapted for mounting by at least two opposite light emitters. In this way light emitters are placed on both sides of the adapter so that light is illuminated on both sides of the sandwich plate, which improves the possibility of using both sides of the sandwich plate for lighting or signaling.

5 DK 174327 B1 På figur 5 ses et skilt 501 der omfatter en sandwichplade med udfræsninger til flere adaptorer set forfra og i et snit. Skiltet 501 er udformet som den figur, skiltet skal signalere, og skiltet 501 er forsynet med jævnt fordelte udfræsninger 3 til montage af 5 adaptorer ifølge opfindelsen. Da der er fjernet overflødigt materiale fra skiltet, opnås lav vægt. Desuden vil skiltet også kunne aflæses i fuldt dagslys, da aflæsningen af skiltet ikke er afhængig af lysgi verne.5 DK 174327 B1 Figure 5 shows a plate 501 comprising a sandwich plate with cutters for several adapters from the front and in a section. The sign 501 is designed as the figure to sign, and the sign 501 is provided with evenly distributed cut-outs 3 for mounting 5 adapters according to the invention. Because excess material has been removed from the sign, low weight is achieved. In addition, the sign can also be read in full daylight, as the reading of the sign does not depend on the light sources.

På figur 6 ses et rektangulært skilt 601, hvori et antal adaptorer 1 er isat i et mønster, 10 der definerer skiltets signal. Denne udførselsform er simpel at ophænge, da flere figurer kan placeres på den samme plade. Desuden er den enkel at fremstille, da pladen ikke skal udskæres i figur.Figure 6 shows a rectangular sign 601 in which a plurality of adapters 1 are inserted in a pattern 10 defining the signal of the sign. This embodiment is easy to hang since several shapes can be placed on the same plate. Furthermore, it is easy to manufacture as the plate does not need to be cut out in figure.

På figur 7 ses en udførselsform af opfindelsen, hvor et antal adaptorer 1 er isat en 15 sandwichplade, hvor det ene lag af elektrisk ledende materiale er opdelt i et antal indbyrdes elektrisk isolerede segmenter 701,702,703. Herved kan lysgivere i sandwichpladen tændes og slukkes individuelt for hvert segment. Dette giver mulighed for forskellige former for løbelys. Samme effekt kan opnås ved at montere en anden udførselsform af adaptoren i en sandwichplade med yderligere elektrisk isolerede kerner og 20 yderligere lag af elektrisk ledende materiale. Denne udførselsform omfatter forskellige adaptorer med anodeben og katodeben placeret så de ved montage etablerer elektrisk forbindelse med forskellige lag. Ved kombination af de nævnte muligheder for at opdele fatningerne i grupper, kan komplicerede mønstre opnås. 1 2 3 4 5 6Figure 7 shows an embodiment of the invention in which a plurality of adapters 1 is fitted with a sandwich plate, in which one layer of electrically conductive material is divided into a number of mutually electrically insulated segments 701,702,703. This allows light emitters in the sandwich plate to be switched on and off individually for each segment. This allows for different types of running lights. The same effect can be achieved by mounting another embodiment of the adapter in a sandwich plate with additional electrically insulated cores and 20 additional layers of electrically conductive material. This embodiment comprises various adapters with anode pins and cathode pins placed so that, upon assembly, they establish electrical connection with different layers. By combining the aforementioned options to divide the sockets into groups, complicated patterns can be obtained. 1 2 3 4 5 6

Figur 8 viser en udførselsform af adaptoren 1, til montage i en udfræsning , der ikke 2 går hele vejen gennem sandwichpladen. Katodebenet 9 er udformet, så det ved isæt 3 ning i pladen vil blive bukket og herved etablere god elektrisk forbindelse med det ene 4 lag af elektrisk ledende materiale. Figur 9 viser samme adaptor 1, monteret i en ud 5 fræsning 3, der ikke går hele vejen gennem sandwichpladen. Katodebenet 9 er bukket, 6 så den elektriske forbindelse med de ene lag af elektrisk ledende materiale 10 etableres med hjælp af fjerderkraften i katodebenets 9 deformation. På figur 10 ses adaptoren nedefra, anodebenet 6 etablerer elektrisk kontakt med det ene lag af elektrisk ledende materiale 7 ved at anodebenet 6 ved montering af adaptoren presses ind i kanten på 6 DK 174327 B1 laget af elektrisk ledende materiale 7. På figur 11 ses adaptoren fra siden, hvor niveauforskellen mellem anodebenet 6 og katodebenet 9 ses tydeligt. Med anvendelse af denne udførselsform opnås sikring mod fugtindtrængning fra den ene side, og da sandwichpladens ene lag bevares i et sammenhængende stykke, vil sandwichpladen 5 selv ved mange udffæsninger forblive vil være stabil.Figure 8 shows an embodiment of the adapter 1 for mounting in a cut-out that does not 2 go all the way through the sandwich plate. The cathode leg 9 is designed so that by insertion 3 into the plate it will be bent, thereby establishing good electrical connection with the one 4 layer of electrically conductive material. Figure 9 shows the same adapter 1, mounted in an out 5 milling 3 that does not go all the way through the sandwich plate. The cathode leg 9 is bent, so that the electrical connection with one layer of electrically conductive material 10 is established by means of the spring force in the deformation of the cathode leg 9. Figure 10 shows the adapter from below, the anode leg 6 establishes electrical contact with one layer of electrically conductive material 7 by pushing the anode leg 6 into the edge of the layer of electrically conductive material 7 when mounting the adapter. from the side where the level difference between the anode leg 6 and the cathode leg 9 is clearly seen. Using this embodiment, moisture penetration is achieved from one side, and as one layer of the sandwich plate is preserved in a continuous portion, even in many finishes, the sandwich plate 5 will remain stable.

Claims

An adapter (1) for at least one light emitter (2) for mounting in a cutout (3) in a plate (4), the adapter (1) comprising one or more first legs (9) and one or more second legs (6) 5, characterized in that the plate (4) is a sandwich plate (4) comprising a core of electrically insulating material (11) and a layer of electrically conductive material on each side of the core, where the cutter (3) extends completely or partially through said sandwich plate (4), said first leg (9) is adapted to establish electrical connection with one layer (10) by mounting in the cutter (3), and said second leg (6) is adapted to mounting in the cutter (10). 3) establishing electrical connection with the second layer (7).

An adapter (1) according to claim 1 for mounting at least two opposite light emitters.

The adapter (1) of claim 1 or 2 wherein the light emitter is a diode (2) 15

An adapter according to any one of claims 1-3, wherein the sandwich plate (4) further comprises a core of electrically insulating material and a further layer of electrical material.

Use of an adapter (1) for at least one light emitter (2) for mounting in a cutout (3) in a plate (4), the adapter (1) comprising one or more first legs (9) and one or more others leg (6), characterized in that the plate (4) is a sandwich plate (4) comprising a core of electrically insulating material (11) and an electrically conductive material (7, 10) on each side of the core to form a core. the desired image wherein the cutout (3) passes in whole or in part through the sandwich plate (4), which first legs (9) are adapted to establish electrical connection with one layer (10) by mounting in the cutter (3), and which other pins (6) are adapted to establish electrical connection with the second layer (7) by mounting in the cutter (3) 1

Use of an adapter (1) according to claim 5, wherein the adapter (1) comprises at least two opposite light emitters. DK 174327 B1

Use of an adapter (1) according to claim 5 or 6, wherein the electrical connection is established by pressing fit

Use of an adapter (1) according to any of claims 5-7 wherein the sandwich plate (4) comprises an additional electrically insulating core and at least one additional layer of electrically conductive material.

Use of an adapter according to any one of claims 4-7 wherein at least one of the sandwich sheet layers of electrically conductive material is divided into several electrically insulated segments (701, 702, 703).