Optical waveguides – With disengagable mechanical connector – Structure surrounding optical fiber-to-fiber connection
Patent
1995-05-26
1996-10-08
Lee, John D.
Optical waveguides
With disengagable mechanical connector
Structure surrounding optical fiber-to-fiber connection
385 60, 385 76, 385136, G02B 638
Patent
active
055639720
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a plug connection for a light guide which is connected to a plug having a centering pin which is plugged into a centering bush or sleeve of a holding body which is secured to a backplane printed circuit board of an electrical module frame, and the backplane printed circuit board is provided with free holes for the plug connection.
A plug connection of this type has been disclosed, for example, in DE 9010 866 U1. According to the latter, the plug has a union nut which can be screwed together with a threaded piece connected to the centering bush. The union nut extends from a central section of the plug to beyond the centering pin. The nut is knurled throughout for the purpose of manual actuation.
In modern broadband switching technology, it is normal to provide the backplane printed circuit boards with shielding layers over a large area for the purpose of shielding. Since the plug connection of the light guide must remain largely free from external forces, the plug connector parts are intended not to touch the backplane printed circuit board. Therefore, a gap exists between the shielding layer and the plug connector parts and the gap reduces the quality of the shielding, especially since the plug connector parts are not connected to ground.
SUMMARY OF THE INVENTION
The invention is based on the object of increasing the shielding reliability. This object is achieved by an improvement in a plug connection for a light guide, which is connected to a plug having a centering pin which is plugged into a centering sleeve of a holding body which is secured to a backplane printed circuit board of an electrical module frame on the module side, and the backplane printed circuit board is provided with a free hole for each plug connection. The improvements are that the backplane printed circuit board, on the side opposite the holding body, has an external shielding layer to which a metal body is secured so as to make contact over a large area, that the metal body is provided with an aperture for the plug connection, and that a metallic shielding sleeve which encloses the plug is secured circumferentially in the aperture. A large-area and intensive contact can be produced between the stable metal body and the external shielding layer, as a result of which the backplane printed circuit board is completely sealed along the shielding layer. The shielding sleeve can be connected to the metal body in a radio-frequency-tight manner, for example by means of screwing into the latter. It can be connected to the plug, for example by its other end, so as to give a contact, so that the gap between the plug and the shielding sleeve is sealed.
However, there is also the possibility of extending the shielding sleeve beyond the plug, as a result of which the gap between the shielding sleeve and the plug becomes so long that extensive shielding is achieved. The shielding sleeve, in this arrangement, can be designed such that it closely surrounds the plug and/or the incoming light guide, as a result of which forces acting laterally on the plug are intercepted and cannot influence the sensitive plug connection.
As a result of the development according to an embodiment in which the shielding sleeve projects beyond the plug on the side of the incoming light guide and a shielding sleeve covers the plug in the manner of a cap and has an end with a narrow opening for the sheathed light guide to pass through, virtually complete sealing is achieved between the plug parts and the shielding sleeve In this arrangement, the internal diameter of the shielding sleeve can be so large that the plug parts are not contacted, so that the plug connection remains uninfluenced by corresponding lateral forces.
As a result of the development according to another embodiment in which the shielding sleeve is designed as an essentially open cylindrical thin tube which, on the side facing the light guide, has spring tongues which are cut free by means of narrow longitudinal slits and rest on a smoothly surfaced c
REFERENCES:
patent: 4362898 (1982-12-01), Zendle et al.
patent: 4804244 (1989-02-01), Hasegawa et al.
patent: 5066096 (1991-11-01), Krausse
patent: 5074636 (1991-12-01), Hopper
patent: 5271080 (1993-12-01), Hopper et al.
patent: 5315684 (1994-05-01), Szegda
Krausse Peter
Thalhammer Erich
Lee John D.
Siemens Aktiengesellschaft
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