EP0105007B1 - Procédé de fabrication de réflecteur d'ondes en matières plastiques, et réflecteur obtenu par ce procédé - Google Patents

Procédé de fabrication de réflecteur d'ondes en matières plastiques, et réflecteur obtenu par ce procédé Download PDF

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Publication number
EP0105007B1
EP0105007B1 EP19830401887 EP83401887A EP0105007B1 EP 0105007 B1 EP0105007 B1 EP 0105007B1 EP 19830401887 EP19830401887 EP 19830401887 EP 83401887 A EP83401887 A EP 83401887A EP 0105007 B1 EP0105007 B1 EP 0105007B1
Authority
EP
European Patent Office
Prior art keywords
main structure
reflecting surface
mold
sheet
tissue
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
Application number
EP19830401887
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0105007A1 (fr
Inventor
Robert Herold
Serge Culos
Bernard Bancal
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0105007A1 publication Critical patent/EP0105007A1/fr
Application granted granted Critical
Publication of EP0105007B1 publication Critical patent/EP0105007B1/fr
Expired 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
    • H01Q15/141—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
    • H01Q15/144—Apparatus or processes specially adapted for manufacturing reflecting surfaces using insulating material for supporting the reflecting surface with a honeycomb, cellular or foamed sandwich structure

Definitions

  • the present invention relates to a process for manufacturing a plastic wave reflector, as well as a reflector obtained by this process, such a reflector being in particular intended for use in radar or in telecommunications.
  • reflectors of the “sandwich” type for example by document FR-A-2168 891, which comprises a first metal sheet intended to form the reflector, placed on a mold, a second sheet intended to form the face rear of the reflector, arranged at a certain distance from the first sheet, the space between the two sheets being filled with a plastic material.
  • Reflectors of the “sandwich” type are also known comprising a core of honeycomb materials, covered with fabrics impregnated with polyester or epoxy resins.
  • these reflectors are formed by successive assemblies of the constituent elements defined above on a metal or plastic mold, machined with great precision according to the profile of the part to be obtained. After hardening of the impregnation and bonding resins, the reflector is removed from the mold.
  • the object of the invention is a process for manufacturing plastic wave reflectors combining high dimensional stability with high form accuracy, which avoids the drawbacks mentioned, in particular the machining operations necessary to remedy the defects observed after the steaming.
  • the main structure is produced, the reflective surface is produced, then the main structure is assembled with the reflective face by gluing the reflective face using an adhesive which expands at room temperature, by positioning precisely the main structure without contact on the reflecting skin, the adhesive expanding and then polymerizing.
  • This assembly 6 is hardened, substantially at room temperature, then removed from the mold and placed on a simple support where it undergoes the steaming operation until complete polymerization.
  • Figure 2 schematically shows the assembly operation of the main structure 6 of Figure 1 with a reflective surface.
  • FIG 3 shows schematically the finished product, that is to say the reflector obtained by applying the method according to the invention. It is noted that the expanded adhesive 9 occupies the entire interval 8 and that it has penetrated through the holes 5 provided in the first skin 1 of the main structure 6, to create anchor points 10 of the surface 7 in the core 2 of the main structure 6.
  • the adhesive used which expands during processing, without being as liquid as a normal adhesive, may however have a sufficient degree of fluidity before expansion to risk not remaining in place when the surface of the surface reflective on which it is extended has a significant curve.
  • Figures 4, 5 and 6 schematically show the different stages of producing a reflector according to this variant of the method according to the invention.
  • FIG. 4 represents the main structure produced in accordance with the variant of the method according to the invention.
  • This structure comprises a thin sheet 11 of honeycombs, plastic or metallic, deposited on a precision mold (not shown), glued to the first skin 1, the core 2 of honeycomb material glued to the skin 1 and the second skin 3 bonded to the core 2.
  • the reflective surface 7 is produced in the manner which has been described previously. The assembly of the structure with the reflecting surface is then carried out.
  • FIG. 5 represents the positioning of the various constituents of the reflector during assembly, similar to FIG. 2 except with regard to the sheet 11, added in the embodiment of FIG. 5, which constitutes the interface between the structure main 6 and the reflecting surface 7, and the gap 8 which is located between the sheet 11 and the reflecting surface 7.
  • the adhesive product 9 is deposited on the face of the reflecting surface 7 opposite the sheet 11. In the figure 5, this product is shown before expansion.
  • FIG. 6 schematically represents the reflector obtained according to the invention after expansion and polymerization of the adhesive.
  • the expanded adhesive 9 has easily penetrated into the sheet 11, ensuring the anchoring of the reflecting surface 7. It may also be recalled that the presence of this sheet 11 regulates the expansion of the adhesive and reduces the stresses possibly introduced by it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Aerials With Secondary Devices (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP19830401887 1982-09-28 1983-09-27 Procédé de fabrication de réflecteur d'ondes en matières plastiques, et réflecteur obtenu par ce procédé Expired EP0105007B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8216299 1982-09-28
FR8216299A FR2533494A1 (fr) 1982-09-28 1982-09-28 Procede de fabrication de reflecteurs en matieres plastiques

Publications (2)

Publication Number Publication Date
EP0105007A1 EP0105007A1 (fr) 1984-04-04
EP0105007B1 true EP0105007B1 (fr) 1987-11-19

Family

ID=9277806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830401887 Expired EP0105007B1 (fr) 1982-09-28 1983-09-27 Procédé de fabrication de réflecteur d'ondes en matières plastiques, et réflecteur obtenu par ce procédé

Country Status (3)

Country Link
EP (1) EP0105007B1 (OSRAM)
DE (1) DE3374630D1 (OSRAM)
FR (1) FR2533494A1 (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104779046A (zh) * 2015-04-28 2015-07-15 北京瑞奇恩互感器设备有限公司 防噪声开合式电流互感器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0196734A3 (en) * 1985-03-28 1988-08-03 Satellite Technology Services, Inc. Cassegrain antenna for tvro application

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1359167A (fr) * 1962-02-05 1964-04-24 Kennedy Antenna Division Of El Perfectionnement aux réflecteurs paraboliques
GB1329981A (en) * 1969-12-08 1973-09-12 Goodyear Tire & Rubber Skin covered foam article and method of preparation
GB1354352A (en) * 1970-06-05 1974-06-05 Monostruct Corp Ltd Moulded cored structural component and method of producing same
FR2165739A1 (en) * 1971-12-28 1973-08-10 Labo Cent Telecommunicat Radar reflector bodies - comprising a rigid (polyurethane) foam dish with polyester impregnated glass cloth covers
FR2168891B3 (OSRAM) * 1972-01-25 1975-02-07 Filoche Pierre
NL179527C (nl) * 1977-05-20 1986-09-16 Philips Nv Werkwijze en inrichting voor de vervaardiging van een reflektor met een kunststof steunlichaam.
JPS55117304A (en) * 1979-03-01 1980-09-09 Mitsubishi Electric Corp Curved surface panel
IL63639A0 (en) * 1980-09-05 1981-11-30 Stanford Res Inst Int Radiation reflector arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104779046A (zh) * 2015-04-28 2015-07-15 北京瑞奇恩互感器设备有限公司 防噪声开合式电流互感器

Also Published As

Publication number Publication date
EP0105007A1 (fr) 1984-04-04
FR2533494B1 (OSRAM) 1985-05-03
DE3374630D1 (en) 1987-12-23
FR2533494A1 (fr) 1984-03-30

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