Abstract: An optical connector component of a sleeve, a ferrule, conversion sleeve, and an optical composite component which is manufactured precisely and easily at a low cost and improved in the decrease of a drawing force due to changes with time or friction. An optical connector component consisting of a thermoplastic resin and comprising a through hole for attaching an optical component, wherein grooves in a number of n (n is an integer of two or more) are arranged in parallel with the through hole in the outer surface or the inner surface at a position of n-times rotational symmetry on the axis of the center of the through hole.

Abstract: A connector device includes a main body having a plug section. The main body accommodates therein two contact members, a bidirectional diode-thyristor, and a distal end portion of a signal-transmission cable connected with an external electronic equipment. The two contact members are connected with two terminals of the thyristor and two conductor wires of the signal-transmission cable, to thereby obtain a modular plug with overvoltage protection. By inserting the modular plug into a modular jack, the external electronic equipment is connected with a communication line. If an overvoltage is applied to the communication line, the thyristor is rendered conductive to absorb the overvoltage, so that the electronic equipment is protected from the overvoltage.