Optical fiber connector

An optical fiber connector, comprising:

• a connector case having a pair of front and rear transverse ribs to define a receiving cavity between them, each transverse rib having a semi-circular cut therein;
• a ferrule extending forwardly through said semi-circular cut in said front transverse rib to be fitted into a mating sleeve;
• a ferrule holder placed in said receiving cavity to hold said ferrule for axial movement and having a body portion, a pair of front and rear cylindrical bosses extending outwardly from opposite ends of said body portion, and a pair of flanges extending radially from rear ends of said cylindrical bosses, respectively;
• a stopper plate having a central aperture into which said rear cylindrical boss is inserted for sliding motion;
• a stop ring secured to a front face of said rear flange for prevent said stopper plate from falling off from said rear cylindrical boss;
• a conical spring placed between said front flange and said stopper plate for biasing said ferrule holder forwardly;
• said conical spring being arranged such that its diameter increases toward the rear end and diameters of said semi-circular cut on said front transverse rib and said central aperture of said stopper plate being set so large relative to said cylindrical bosses that a small rearward movement of said ferrule permits a large radial movement thereof, thereby making it easy to fit said ferrule into a mating sleeve.