Patent ID: 8348524

Claim:
A plug for attaching to a base end of an endoscope and connecting to a socket, said socket being provided on a main body side of an endoscope device, said plug comprising: an image guide comprising an image guide fiber and an image guide rod, said image guide rod being generally aligned with a base end of said image guide fiber; a light guide comprising a light guide fiber and a light guide rod, said light guide rod being generally aligned with a base end of said light guide fiber; and a plug main body for fixing the base end of the image guide fiber and the base end of the light guide fiber in a parallel state, the base end of the image guide fiber and the base end of the light guide fiber being separated by a space; in combination with the socket, the plug being connected to the socket to form a connecting structure, the socket comprising a first hole including a fitting portion for receiving the image guide and a position-aligning portion for regulating positioning of the image guide, the socket further comprising a second hole including a fitting portion for receiving the light guide and a position-aligning portion for regulating positioning of the light guide; wherein the plug further comprises an elastic engaging piece, said elastic engaging piece having a base end comprising an engaging part linked to a base end of the plug main body, said elastic engaging piece further having a tip end comprising a pressing part of smaller width than a width of the engaging part, wherein the engaging part is formed so as to be separable from the plug main body, wherein the socket further comprises an engaging wall part having a hole to be engaged, said hole to be engaged comprising a wide hole having a width allowing for insertion of the engaging part and further comprising a narrow hole connected to the wide hole and having a width allowing insertion of the pressing part, wherein when the plug is fitted into the socket, the engaging part is pressed at an edge of the wide hole so as to be urged towards the plug main body, and wherein when the engaging part passes through the wide hole, it moves away from the plug main body so that the pressing part is positioned inside the narrow hole and the engaging part engages with an edge of the abovementioned narrow hole.