Nippon Telegraph and Telephone Corporation

Yashuhiro Ando

Kazunori Kanayama

Akira Nagayama

Kuniharu Kato

Shigemitsu Oguchi

Takashi Yoshizawa

An optical fiber connector unit is composed of a ferrule including a first flange and a second flange formed to have a greater diameter than other portions, a stopring provided outside of the ferrule, having on its inner peripheral surface a first step and a second step, a coil spring having one end contacting with the first flange end face and the other end contacting with the first step end face, its tip exerting a spring force in an axial direction towards outside from the stopring; and a locating member provided between the stopring and the ferrule and having a first stopper contacting with the second step end face and a second stopper contacting with the second flange end face. The optical fiber connector using the unit can easily be assembled. The optical fiber connector, which does not require rotational positioning in assembly, has a flange-formed projection on the outer peripheral surface of the stopring, a plug frame having an opening engaging with the outer peripheral surface has a protrusion for engaging with the projection to prevent the stopring from passing to an opening end side, and having a relation of D.sub.2 &gt;-d.sub.1 &gt;D.sub. 1 where D.sub.1 being a diameter of a circle including the inner peripheral surface of the protrusion, D.sub.2 being a diameter of a circle including the inner peripheral surface other than the protrusion, and d.sub.1 being a diameter of a circle including a tip of the projection of the stopring.

Growing community of inventors

Houya, Japan

Yashuhiro Ando