Optical waveguides – With disengagable mechanical connector – Optical fiber/optical fiber cable termination structure
Patent
1997-06-17
1999-01-19
Palmer, Phan T. H.
Optical waveguides
With disengagable mechanical connector
Optical fiber/optical fiber cable termination structure
385 60, 385 68, 385 78, 385 84, G02B 636
Patent
active
058622829
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/JP96/01922, filed Jul. 11, 1996 which designated the U.S.
1. Technical Field
The present invention relates to an optical connector for connecting optical fibers, and more particularly to a plug-adapter-plug type optical connector for connecting plugs through an adapter and also to an optical connector plug thereof.
2. Background Art
Among the known conventional plug-adapter-plug type optical connectors are an FC connector of JIS C 5970 F01 type, an SC connector of JIS C 5973 F01, and an MPO connector disclosed in Japanese Utility Model Publication No. 4-49606 and Japanese Patent Application laid-Open No. 4-347806.
Because these optical connectors are assumed to be connected and disconnected frequently, they are required to have a function to position an optical fiber with high precision and a function to maintain the close junction between optical fibers. To maintain the close junction between optical fibers, a ferrule in a housing of each connector plug is made axially movable and is biassed from the rear by a coil spring. When the connector plugs are coupled, the ferrule is moved rearwardly against a biassing force to produce a predetermined pressing force. The optical fiber cord used on this connector is a so-called tension-resistant fiber-covered optical fiber cord, which, as shown in FIG. 4, includes: a secondary coated optical fiber made up of a primary coated optical fiber (a bare optical fiber) covered with an optical fiber jacket of resin; a tension-resistant fiber enclosing the secondary coated optical fiber; and an optical cord jacket enclosing all these.
The end of the tension-resistant fiber is secured to the housing to prevent the secondary coated optical fiber from being tensed.
In recent years, the conventional tension-resistant fiber-covered optical fiber cords are being increasingly replaced with a new type of optical fiber cord (hereinafter referred to as a tension-resistant jacket-covered optical fiber cord) in which, as shown in FIG. 2, an optical cord jacket is directly fitted substantially tightly over the secondary coated optical fiber and is provided with a tension resisting capability.
When such a tension-resistant jacket-covered optical fiber cord is applied to the conventional optical connector plug, however, the optical cord jacket is directly fixed to the ferrule and also to the housing. This gives rise to the problem of retraction of the ferrule at the time of connector coupling which results in the optical fiber being bent locally with a small radius of curvature, leading to increased losses and deteriorated reliability. Possible means to avoid this problem may include not fixing the optical cord jacket to the housing. But this will further retract the ferrule when the optical fiber cord is subjected to tension, rendering the joint unstable and, in the worst case, dislodging the fibers out of joint, which in turn results in an increase in connection losses and reflected light.
A primary object of this invention is to solve the aforementioned problems experienced with the prior art and to provide an optical connector plug and an optical connector that can stably couple even a tension-resistant jacket-covered optical fiber cord.
DISCLOSURE OF THE INVENTION
To accomplish the object, in a first aspect of the present invention, there is provided an optical connector plug comprising: coated optical fiber and a tension-resistant jacket covering the secondary coated optical fiber; of the optical fiber cord are secured to the ferrule and the ferrule is axially immovably mounted to the housing.
Here, the housing may comprise a plug frame, a stop sleeve and an elastic hood.
Further, the tension-resistant jacket of the optical fiber cord may be bonded to a rear end portion of the elastic hood of the housing.
On the other hand, the housing may be integrally formed with an adapter to which a mating optical connector plug to be connected are inserted.
In another aspect of the present invention, there is provided an
REFERENCES:
patent: 5170452 (1992-12-01), Ott
patent: 5231685 (1993-07-01), Hanzawa et al.
patent: 5719977 (1998-02-01), Lampert et al.
Matsuura Ichiro
Nagasawa Shinji
Ueda Tomohiko
Yamanishi Toru
Nippon Telegraph and Telephone Corp.
Palmer Phan T. H.
Sumitomo Electric Industries Ltd.
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