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Method for assembling a miniaturized gyromagnetic device
| Details |
Inventors: Prevot, Julien; Chabani, Kamel; Courgeon, Michel; Duquenoy, Denis; Duquenoy, Roger; Le Navenec, Regis;
Assignee: Thomson-CSF (Paris, FR)
Primary Examiner: Echols; P. W.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
The invention pertains to a gyromagnetic device such as an insulator, operating at ultra-high frequencies (1-40 GHZ). The assembling of gyromagnetic devices requires high-precision positioning, generally obtained by bonding. In the isolator of the invention, the conducting core and the two ferrite wafers are held by two internal ground plates which form a positioned assembly, one of the plates being provided with tongues which position the parts and which fit into slits in the other ground plate. The assembling is done by stacking, inside the casing, a pressure washer, the magnet, the pre-positioned assembly and the base plate, and by closing the device with a single electric weld. |
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DETAILED DESCRIPTION The gyromagnetic device according to the invention has been designed for easy assembly according to a simple and, therefore, swift and inexpensive method.
Furthermore, one object of the invention is to have a miniaturized, ultra-high frequency component because the design of such a component eliminates all mechanical means such as screws for assembly: being miniaturized, it can be integrated into a hybrid circuit.
Another object of the invention is to provide for means designed to absorb thermal expansion during the operation of the device.
When these compensation means are not provided for, the ferrite elements can break.
The gyromagnetic device according to the invention comprises conventional parts: a conducting core fitted with external connectors, at least one ferrite element and one absorbing block, at least one magnet and an internal ground, the entire unit being mounted in a casing.
In this device, the parts which must be assembled and positioned with precision (especially the core and the ferrite elements) form a whole clamped between two internal ground parts fitted with reciprocal fixing means, the external or internal shapes of these different parts being complementary to one another, thus providing for precise positioning.
The invention also comprises the magnet positioning part which is a pressure washer that is not flat, the elasticity of which absorbs thermal expansions.
The method for assembling the gyromagnetic device according to the invention comprises a simple stacking of parts, the external and internal shapes of which automatically enable them to be correctly positioned.
Again, in the invention, when the parts are stacked in the casing, a single electric welding of the lid to the casing closes the gyromagnetic device and makes it an integrated component.
More precisely, the invention pertains to a miniaturized and integrated gyromagnetic device comprising, within a casing closed by a base plate, one conducting core, two ferrite wafers, one internal ground and one magnet, a gyromagnetic device wherein the conducting core and the two ferrite wafers are held so that they are integrally joined to each other and precisely positioned by two internal ground plates, made of non-magnetic material, one of these plates having tongues which fit into the slits formed in the other plate, providing for reciprocal fastening to clamp the core and the ferrite wafers
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Generators or Motors 
