Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1993-07-26
1996-11-05
Ledynh, Bot L.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
257779, 257784, 336 90, H05K 702
Patent
active
055724108
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the making of electronic components of very small dimensions, and in particular to those including a winding connected to one or more electronic circuits, or more precisely to one or more chips or integrated circuits or printed circuits or discrete electronic elements. Electronic circuit will be spoken of hereafter in the description, it being well understood that each time it may have to do with one or the other of the elements mentioned above.
Certain problems are encountered at the time of making such components, caused mainly by the very small dimensions of the elements in question; indeed, the type of electronic circuit involved here has typical dimensions on the order of 1 mm.times.1 mm.times.0.5 mm and a typical mass on the order of 4 mg, whereas the coil core, for one of the embodiments considered, has a diameter on the order of 0.8 mm and a length of about 5 mm, and the copper wire used for winding has a typical diameter of 0.020 mm over enamelled insulation.
When producing such a component conventionally, it is necessary to fix the electronic circuit or circuits to the core before the winding of the latter, the fixing in position of one of these elements relative to the other having to be done with great precision so that the ends of the winding wires may be brought safely opposite the metal paths disposed on the electronic circuit in order to be soldered there, on an automatic winding machine. Such a component according to the prior art is described in the application EP-A-0.405.671, where it is seen that the circuit or circuits are first fixed to a specially shaped portion of the core.
The fixing process according to the invention proposes to get rid of this drawback by eliminating the intermediate step consisting in first fixing the core to be wound to the electronic circuit. The elimination of this delicate step greatly facilitates the production of such components by making it possible to avoid soiling the tool or the production machine with glue and, moreover, by making use of a tool manufactured with precision, permits doing away with the necessity of having precise positioning of the various elements before they are disposed on the winding tool.
A first object of the invention is therefore to propose a winding process by which, in particular, the electronic circuit or circuits are held independently of the winding, appropriate guide means guiding the winding wire so that it passes directly above metal paths of the electronic circuit or circuits. Another object of the invention is that the process may preferably be applied to an automatic winding machine provided with a "flyer"-type pay-out reel. Another object of the invention is that the preceding process may be applied to a winding carried out on a core as well as to a winding carried out on a false core, thus permitting an air-core coil to be obtained. Other objects of the invention are that the soldered joints of the wires on the circuits may take place along a plane parallel to the axis of the core, and that different possibilities may be envisaged for withdrawing the component from the machine after winding.
In order to achieve these different objects, the winding process according to the invention answers the characteristics of claims 1 to 7.
Another object of the invention is to propose a tool permitting the preceding process to be carried out, capable of holding the different electronic circuits and the winding independently of one another and comprising guide means capable of bringing the winding wire safely to the suitable locations for soldering and winding.
This object is obtained by a specially designed holding tool answering the characteristics of claims 8 to 11.
And finally, another object of the invention is to propose a component, comprising a winding and at least one electronic circuit, without any rigid mechanical connection between the winding and the electronic circuit or circuits, produced especially by the process and with the aid of the tool mentioned above, this component capable
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