Electrical connectors – Electromagnetic or electrostatic shield – Multi-part shield body
Patent
1991-03-27
1992-05-12
Abrams, Neil
Electrical connectors
Electromagnetic or electrostatic shield
Multi-part shield body
439108, H01R 13648
Patent
active
051122510
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electrical connector for connecting a shielded multiconductor cable to an electrical assembly located inside a chassis.
BACKGROUND OF THE INVENTION
In the technology of building electronic equipment used for telecommunications and, in particular, for data processing, widespread use is made of electrical assemblies of varying degrees of complexity such as electrical recorders or electronic circuits operating by pulses for example, which are particularly sensitive to the disturbing effects of electromagnetic radiation generated by other electrical circuits outside these assemblies. This is why these electrical assemblies, in order to be protected against this parasitic radiation, are generally enclosed in a metal chassis which both mechanically supports and electrically shields the electrical assembly.
The electrical assemblies enclosed in these chassis consume electrical current and are generally supplied by electrical generators designed to deliver electrical currents whose voltage, intensity, and/or frequency characteristics must meet specific conditions in order to allow these assemblies to operate correctly. Some of these electrical generators, such as those delivering DC voltages of several tens of volts for example, can be accommodated inside the same chassis as that containing the consumer assembly supplied by these generators. Other generators on the other hand, such as those known as "undulators" for example, cannot be accommodated inside the chassis in which the consumer assembly they supply is located since these generators often cause relatively substantial high-frequency electromagnetic radiation requiring strong shielding which makes them particularly bulky. Moreover, these generators, because of the relatively high electrical voltages--on the order of a few hundreds of volts--prevailing inside them, require careful electrical insulation, and locating them in the chassis containing the assembly to be supplied would probably be hazardous for persons servicing this equipment if, for any reason, these generators had defective insulation. Since each of these generators is located in a different chassis from the chassis containing the consumer assembly to be supplied, it is necessary, to ensure the electrical connection between a generator and this assembly, to use a shielded multiconductor cable whose conducting wires establish the essential links between the electrical circuits of the generator and those of the consumer assembly, whose shielding sheath is connected to the two chassis containing this generator and this consumer assembly.
To allow this shielded multiconductor cable to be easily disconnected from one or the other of these two chassis, in order, in particular, to replace a faulty generator or consumer assembly by another generator or another consumer assembly, in the prior art, shielded connectors of the type described and shown in U.S. Pat. No. 3,904,265 have been used, this connector being composed of two connector parts, the first of which, integral with a chassis, has an insulating body provided with sockets into which are inserted contact elements of a first type (female for example), these contact elements being connected to the circuits of a generator assembly or the consumer assembly contained in this chassis, and the second of which [connector part], attached to one end of the multiconductor cable, has an insulating body provided with sockets into which are inserted contact elements of a second type (male for example) designed to be placed in contact with the contact elements of the first type when these two connector parts are coupled together, these contact elements of the second type being connected to the conducting wires of the multiconductor cable. The insulating body of the first connector part is provided with a first shielding element made of a conducting material, the first element being electrically connected to the metal chassis. Likewise, the insulating body of the second connector part is provided w
REFERENCES:
patent: 4536045 (1985-08-01), Reichardt et al.
patent: 4708412 (1987-11-01), Hines, Jr. et al.
patent: 4738637 (1988-04-01), Asick et al.
Abrams Neil
Bull S.A.
Nguyen Khiem
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