Patent ID: 7245812

Claim:
A structure for connecting an optical fiber to an interface box having a wall through which a through-hole is formed, the structure comprising: a ferule having a first center hole through which an optical fiber is inserted, the ferule being held in the through-hole of the wall; a grommet having a second center hole through which the optical fiber is liquid-tightly inserted, the grommet being fixedly connected to the ferule so that the second center hole is coaxially positioned with the first center hole; a stopper member for fixing the ferule to the through-hole, the stopper member being engaged in a space defined by a guide rail formed on an inside surface of the wall and in a groove formed on an outer periphery of the ferule so that the ferule does not rotate relative to the through-hole and does not move in the axial direction of the optical fiber; a sealing member for liquid-tightly fixing the ferule to the through-hole; and a coupler having a light-receiving/emitting element, the coupler being positioned in the interface box and coupled to the ferule so that an axial end of the optical fiber inserted into the first center hole of the ferule directly faces the light-receiving/emitting element.