Metal working – Method of mechanical manufacture – Electrical device making
Patent
1989-03-16
1990-07-03
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
174250, 174257, 204 15, 427 96, 428901, H05K 302
Patent
active
049379356
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to processes for making an assembly of conductive patterns on an insulating surface of complex form and, in particular, for making printed circuits presenting a complex surface which, a priori, is not developable, for example those which are used for making reflectors of antennas with discrete resonant elements distributed over surfaces of conical, parabolic, hyperbolic, etc . . . type, or those which enter in the structure of complex antennas comprising primary reflectors and secondary reflectors, as in the assemblies known to technicians under the names of Newton, Cassegrain, etc. assemblies.
Several processes to that end already exist. One of them consists in making conductive patterns on a supple, flat support, for example an elastomer. This supple support is then drawn then glued on a form identical to that which is to be obtained. Another process consists in making the conductive patterns on a rigid support, for example a strip of a film of material known under the name KAPTON. This support is then cut out into strips or sectors of reduced width, thus more easily deformable. These strips are then glued on a substrate having the definitive form chosen. Finally, the process is known which consists in machining a metallized surface coated with a protecting varnish and superficially engraved mechanically along the contour of the desired patterns. Those parts which are not operative are then eliminated, like a skin, this operation generally being carried out manually.
It is obvious that these processes present drawbacks, for example, for the first process, a poor resistance of the conductive patterns, particularly in the event of considerable variations in temperature. The other two processes seem more reliable, but the complexity of their embodiment does not render them industrializable and they can only be used punctually.
The present invention has for its object a process for making printed circuits presenting a complex surface which is non-developable or developable only with great difficulty, which overcomes the drawbacks of the known processes, whilst conserving certain of their qualities.
More precisely, the present invention has for its object a process for making an assembly of electrically conductive patterns on an electrically insulating surface of complex form, noteworthy in that: flat support; complex form; and
The Figures of the accompanying drawing will clearly show how the invention may be carried out. In these Figures, identical references designate like elements.
FIG. 1 shows an antenna reflector in which the product obtained by the process according to the invention finds a particularly advantageous application.
FIGS. 2 to 7 show diagrams illustrating the different successive steps of carrying out the process according to the invention.
FIGS. 8 to 12 represent different embodiments which may be obtained with the process according to the invention.
The present invention concerns a process for making printed circuits presenting complex surfaces which are non-developpable or at least fairly difficult to develop. These circuits are of very great importance in modern techniques and are in particular currently used in reflectors of antennas 1 such as the one illustrated in FIG. 1. This reflector 1 is mounted on a support 2, which cooperates with a support surface 3 via arms 4. The reflector 1 presents a surface which is non-developpable in shape, for example paraboloid 5. The surface 6 of this paraboloid is constituted by a support 7 made of an electrically insulating material comprising on its surface 8 patterns 9 which, themselves, are electrically conductive. By way of example, patterns in the form of crosses have been shown, but it is obvious that these patterns may be in any other shapes necessary for the technicians.
In order to make such electrically conductive patterns, the process as described hereinafter is advantageously used, which, with respect to the processes of the prior art, gives very good results, but which presents the additional advantage of
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Arbes C. J.
Hall Carl E.
Societe Nationale Industrielle et Aerospatiale
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