EP1143561B1 - Reflektor elektromagnetischer Wellen und Verfahren zu seiner Herstellung - Google Patents

Reflektor elektromagnetischer Wellen und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP1143561B1
EP1143561B1 EP01201226A EP01201226A EP1143561B1 EP 1143561 B1 EP1143561 B1 EP 1143561B1 EP 01201226 A EP01201226 A EP 01201226A EP 01201226 A EP01201226 A EP 01201226A EP 1143561 B1 EP1143561 B1 EP 1143561B1
Authority
EP
European Patent Office
Prior art keywords
lattice
wires
thermoplastic material
moulding tool
reflector
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.)
Expired - Lifetime
Application number
EP01201226A
Other languages
English (en)
French (fr)
Other versions
EP1143561A1 (de
Inventor
Jacques Trouillet
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.)
Transformation Industrielle De Matieres Plastiques- Stimap Ste
Original Assignee
Transformation Industrielle De Matieres Plastiques- Stimap Ste
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9531664&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1143561(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Transformation Industrielle De Matieres Plastiques- Stimap Ste filed Critical Transformation Industrielle De Matieres Plastiques- Stimap Ste
Publication of EP1143561A1 publication Critical patent/EP1143561A1/de
Application granted granted Critical
Publication of EP1143561B1 publication Critical patent/EP1143561B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/22—Reflecting surfaces; Equivalent structures functioning also as polarisation filter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H01Q15/142—Apparatus or processes specially adapted for manufacturing reflecting surfaces using insulating material for supporting the reflecting surface

Definitions

  • the present invention relates to electromagnetic wave reflectors made of an element of an electrically conductive material, preferably having a convex face which defines a focal point for radio waves. They are most often antennas in the form of a spherical or parabolic cap, but they can also have any other shape giving focus.
  • DE 3911445 A also discloses antennas made of thermosetting material which require tools intended to obtain the desired shape, in particular parabolic.
  • a metal frame is shaped manually in the tooling.
  • a piece of material is then introduced into the tool above the frame.
  • the tool is locked.
  • Cooking is carried out in order to polymerize the material introduced.
  • the tool is opened and the part is extracted from the mold. Due to molding technology, deburring must be done followed by sanding, removing a primer, then painting on both sides.
  • an antenna comprising a metal fabric coated by injection molding with thermoplastic resin. We gives the desired shape to the wire mesh before molding. It is very difficult to conform a metallic canvas into a parabola with great accuracy.
  • Powder coating technologies do not allow for a large variation in color, without incurring disproportionate manufacturing costs due to the need to clean the manufacturing tool when switching from one color to another .
  • the invention overcomes these drawbacks and makes it possible to obtain an electromagnetic wave reflector protected from corrosion, which is much easier to manufacture and which, in particular, allows the possible use of a paint which is easier and less expensive to use. and therefore to dispense with any painting operation with dusting and the cleaning operations that this entails.
  • the subject of the invention is a method of manufacturing an electromagnetic wave reflector according to claim 1.
  • the network of electrically conductive material may include wires arranged at a distance, preferably constant, from each other.
  • the network is a canvas or a grid, in particular a plane.
  • the manufacture is carried out by injection molding of a thermoplastic material, preferably on a regular mesh grid of an electrically conductive material.
  • the injection is carried out under high pressure, in particular greater than 50 bar and most often between 150 and 450 bar.
  • the network is thus well maintained during molding and the curvatures of the network and of the coating are not offset, the whole being obtained automatically by the usual molding operation.
  • the coating of the wires is often almost complete and, in any case, takes place over more than 80% of the cross section of the wires.
  • the wire generally has a diameter of 0.005 to 0.5 mm, it being understood that the wires can also have a cross section other than circular and that then the values indicated above are understood for the largest dimension of the cross section .
  • thermoplastic material use may in particular be made of polyethylene, polypropylene or other polyolefins, ABS, polycarbonate, poly (methyl methacrylate) as well as any other injectable thermoplastic material.
  • the thickness of plastic material injected is generally between 0.5 mm and 1 cm.
  • the distance between the wires is between 0.003 mm and 1.5 cm.
  • the desired color for the antenna is given to it by the fact that the plastic is dyed in the mass.
  • the antenna can also be transparent.
  • a flat metallic fabric 1 is retained on one of the two half-molds 2, 3 of an injection mold for thermoplastic material.
  • Figure 2 shows that when the fabric 1 is pinched between the two half-molds 2, 3, it protrudes from the periphery of the mold cavity 4
  • FIG. 3 represents the molded injected part 5 in which the fabric 1 is coated which protrudes by a part 6.
  • FIG. 4 shows that the part 6 has been cut in the form of a drop 6 leaving a parabolic antenna in the shape of the imprint 4 which is made up, as shown in FIGS. 5 and 6, of the fabric 1 coated with a layer 7 of thermoplastic plastic.
  • the antenna comprises a central part 8 in the form of a parabola and a peripheral border 9.
  • the fabric 1 appears punctually on one of the faces of the ply 7, while, on at least part of the border 9, the fabric 1 is embedded in the ply 7.
  • the antenna of the figure 5 was obtained when the direction of the injection current into the mold is directed vertically from bottom to top, while in FIG. 6, it was directed vertically from top to bottom.
  • Polyethylene is introduced beforehand brought to a temperature of 260 ° C., so that it can flow through an injection point, into the cavity 4 of the mold which is in the shape of the reflector to be obtained and in which puts a flat aluminum canvas which exceeds.
  • a pressure of 177 bar is applied to the plastic, the closing force of the two mold halves is 800 tonnes.
  • 1.2 kg of polyethylene are injected into the imprint.
  • the injection time is 7 seconds.
  • the injection pressure is 117 bar.

Claims (4)

  1. Verfahren zur Herstellung eines Reflektors elektromagnetischer Wellen mit einer parabolischen Form, wobei ein elektrisch leitendes Netz (1) in ein Formwerkzeug (2, 3) eingesetzt wird, thermoplastischer Kunststoff in das Formwerkzeug (2, 3) eingebracht wird und ein Reflektor entformt wird, dadurch gekennzeichnet, dass
    - das in das Formwerkzeug (2, 3) eingesetzte Netz (1) eine andere Form als die genannte parabolische Form aufweist und
    - das vorzugsweise durchsichtige thermoplastische Material in das Formwerkzeug (2, 3) mit einem derartigen Druck eingespritzt wird, dass es das Netz (1) in die genannte parabolische Form bringt, und zwar in einer Schicht (7) mit einem parabolischen mittleren Teil und einem Randteil, wobei das Netz an einer der Seiten der Schicht punktuell erscheint und wobei das Netz (1) an einem Teil des Randes in der Schicht versenkt ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Netz (1) ein vorzugsweise flaches Metalldrahtgewebe ist.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass es darin besteht,
    - zwischen die beiden Formhälften (2, 3) einer Form zum Spritzguss von thermoplastischem Material ein Netz (1) aus einem elektrisch leitenden Material zu klemmen, das derartige Abmessungen aufweist, dass es über den Umfang der Vertiefung (4) der Form hinausragt,
    - thermoplastisches Material in die Vertiefung (4) zu spritzen,
    - ein Spritzgussteil zu entformen, über dessen Umfang das Netz (1) hinausragt,
    - das Netz (1) unmittelbar bei dem Teil zu schneiden.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Einspritzdruck des thermoplastischen Kunststoffs über 5 Bar beträgt.
EP01201226A 1998-10-16 1999-10-12 Reflektor elektromagnetischer Wellen und Verfahren zu seiner Herstellung Expired - Lifetime EP1143561B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9813007A FR2784804B1 (fr) 1998-10-16 1998-10-16 Antenne a fils enrobes d'une couche de matiere thermoplastique
FR9813007 1998-10-16
EP99947544A EP1119884A1 (de) 1998-10-16 1999-10-12 Reflektor elektromagnetischer wellen und verfahren zu seiner herstellung

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP99947544A Division EP1119884A1 (de) 1998-10-16 1999-10-12 Reflektor elektromagnetischer wellen und verfahren zu seiner herstellung

Publications (2)

Publication Number Publication Date
EP1143561A1 EP1143561A1 (de) 2001-10-10
EP1143561B1 true EP1143561B1 (de) 2004-12-29

Family

ID=9531664

Family Applications (2)

Application Number Title Priority Date Filing Date
EP01201226A Expired - Lifetime EP1143561B1 (de) 1998-10-16 1999-10-12 Reflektor elektromagnetischer Wellen und Verfahren zu seiner Herstellung
EP99947544A Pending EP1119884A1 (de) 1998-10-16 1999-10-12 Reflektor elektromagnetischer wellen und verfahren zu seiner herstellung

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP99947544A Pending EP1119884A1 (de) 1998-10-16 1999-10-12 Reflektor elektromagnetischer wellen und verfahren zu seiner herstellung

Country Status (10)

Country Link
US (1) US6486854B1 (de)
EP (2) EP1143561B1 (de)
JP (1) JP2002528937A (de)
AT (1) ATE286309T1 (de)
AU (1) AU6095299A (de)
BR (1) BR9912233A (de)
CA (1) CA2337810A1 (de)
DE (1) DE69923001T2 (de)
FR (1) FR2784804B1 (de)
WO (1) WO2000024086A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2808382B1 (fr) 2000-04-28 2003-07-25 Vector Ind France Antenne parabolique et son procede de fabrication
FR2819641A1 (fr) * 2001-01-18 2002-07-19 Gilles Ribatto Antenne en matiere thermoplastique conductrice
US20110221101A1 (en) * 2010-03-10 2011-09-15 Legare David J Resin-based molding of electrically conductive structures

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0441216A (ja) * 1990-06-07 1992-02-12 Mikuni Plast Kk パラボラアンテナ射出成形用金型

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE380203B (sv) * 1973-09-24 1975-11-03 Asea Ab Sett for formsprutning av plastforemal med metallyta
US4030953A (en) * 1976-02-11 1977-06-21 Scala Radio Corporation Method of molding fiberglass reflecting antenna
NL179527C (nl) * 1977-05-20 1986-09-16 Philips Nv Werkwijze en inrichting voor de vervaardiging van een reflektor met een kunststof steunlichaam.
JPS5984497A (ja) * 1982-11-06 1984-05-16 株式会社イナックス 電磁波の遮蔽または反射用ｆｒｐ板
JPS6146099A (ja) * 1984-08-10 1986-03-06 株式会社ブリヂストン 電磁波反射体
US4647329A (en) * 1984-09-27 1987-03-03 Toyo Kasei Kogyo Kabushiki Kaisha Manufacture of parabolic antennas
GB2203681B (en) * 1987-04-24 1991-06-19 Fibo Stoep A S A method for the production of a product, and a device for carrying out said method, and a product thus produced
JPH0180783U (de) * 1987-11-18 1989-05-30
JPH01227505A (ja) * 1988-03-07 1989-09-11 Mitsuboshi Belting Ltd パラボラアンテナ用反射体の製造方法
DE3911445A1 (de) * 1989-04-07 1990-10-11 Ring Hans Georg Hohlspiegel zur fokusierung ankommender elektromagnetischer wellen
JP3013369B2 (ja) * 1989-12-01 2000-02-28 大日本印刷株式会社 パラボラアンテナ用リフレクターの製造方法
DE9001255U1 (de) * 1990-02-03 1990-04-05 Hagenbusch, Guenther, 7313 Reichenbach, De
JP2713059B2 (ja) * 1992-10-07 1998-02-16 三菱電機株式会社 電子部品または電子機器を収納する箱または蓋からなる筺体の製造方法。
IT1255930B (it) * 1992-10-28 1995-11-17 Antenna parabolica riflettente per la ricezione di onde elettromagnetiche e relativo metodo di produzione.
DE19613541C1 (de) * 1996-04-03 1997-10-02 Deutsche Forsch Luft Raumfahrt Verfahren zum Herstellen eines Antennen-Reflektors aus Faserverbundwerkstoff mit hoher optischer Oberflächengüte
DE19737566C2 (de) * 1997-08-28 2001-04-05 Ebel Gerlach Helga Verfahren zur Herstellung von mit Kunststoffolie beschichteten gewölbten Metallplatten
WO1999028988A2 (en) * 1997-12-04 1999-06-10 Marconi Aerospace Defence Systems, Inc. Metallized fiber mat, and its use as reflective applique in antenna

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0441216A (ja) * 1990-06-07 1992-02-12 Mikuni Plast Kk パラボラアンテナ射出成形用金型

Also Published As

Publication number Publication date
FR2784804B1 (fr) 2001-06-29
EP1143561A1 (de) 2001-10-10
US6486854B1 (en) 2002-11-26
EP1119884A1 (de) 2001-08-01
AU6095299A (en) 2000-05-08
FR2784804A1 (fr) 2000-04-21
DE69923001D1 (de) 2005-02-03
ATE286309T1 (de) 2005-01-15
DE69923001T2 (de) 2005-07-21
WO2000024086A1 (fr) 2000-04-27
BR9912233A (pt) 2001-04-10
JP2002528937A (ja) 2002-09-03
CA2337810A1 (fr) 2000-04-27

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