Dust proofing shutter built-in adapter of LC type optical connector

摘要

The invention can prevent a leading end of a ferrule including a core portion from being damaged, even in the case that the leading end of the ferrule of a plug is erroneously inserted from a diagonally upward direction side before a fitting portion of an LC type optical connector. A shutter plate (11) is provided with a clearance (30) for receiving in a non-contact manner a leading end portion of a ferrule (24) which is inserted from a diagonally upward direction side before a fitting portion (A). The clearance (30) is formed into a rectangular shape, a trapezoidal shape, a circular arc shape, a bowl-like recess shape or an opening shape from a front surface side of the shutter plate (11) toward an inner side, and the shutter plate (11) is structured such that the shutter plate (11) is pushed away and opened by a leading end opening edge portion of a coupling sleeve (21) which is provided so as to cover a periphery of the ferrule (24), at the same time of receiving the leading end portion of the ferrule (24) by the clearance (3) in a non-contact state.