Patent ID: 6913394
Filing Date: 2005-07-05
Classification: G02B

Abstract:
1. An optical connector plug, comprising: a front housing, a rear housing to be coupled with said front housing, a ferrule, a coil spring, and an optical cord fixing member, and connecting an optical cord including a coated optical fiber having an optical fiber and an optical fiber coat covering the optical fiber, a cord outer jacket further covering said coated optical fiber and a tension resistive member disposed between said coated optical fiber and said cord outer jacket, wherein said ferrule has an optical fiber positioning and fixing portion for positioning and fixing the optical fiber at a tip end of the coated optical fiber of said optical cord and a flange portion contacting with said coil spring and biased thereby, wherein said coil spring has a tip end portion for contacting with said flange portion of said ferrule and biasing the latter, and a rear end portion for contacting with said rear housing, said coil spring having predetermined inner and outer diameters, wherein said optical cord fixing member has an outer diameter capable of insertion into said coil spring and an inner diameter permitting insertion of said optical cord, when said optical cord is fixed thereto, and engaging means for engaging with said rear housing at least on a part of an outer peripheral surface, wherein said front housing includes engaging means for engaging with said rear housing, and a first through hole, said first through hole comprising a tip end side hole portion having an inner diameter greater than an outer diameter of said optical fiber positioning and fixing portion of said ferrule, an intermediate hole portion continuous with said tip end side hole portion, and having a flange portion holding portion for restricting frontward movement of the flange portion of said ferrule and receiving said flange portion, and a rear side hole portion having an inner diameter greater than an outer diameter of said coil spring, wherein said rear housing includes engaging means for engaging with said engaging means of said front housing by relatively moving said rear housing and said front housing toward each other, and a second through hole, on a rear end side of said second through hole, an optical cord inserting hole having an inner diameter permitting insertion of said optical cord but not permitting insertion of said optical cord fixing member is formed, in front of said optical cord insertion hole, an optical cord fixing member holding hole having fixing means for fixing said optical cord fixing member and receiving said optical cord fixing member is formed continuous with said optical cord insertion hole, on a tip end side of said second through hole, a coil spring holding portion for holding said coil spring and biasing the rear end of said coil spring is formed, and between said coil spring holding portion and said optical cord fixing member holding hole, an optical cord fixing member introducing hole for permitting insertion of said optical cord fixing member is formed, wherein in a condition where said front housing and said rear housing are coupled with each other, a through space portion is defined therein, and wherein said ferrule, said coil spring and said optical cord fixing member are received within said through space portion such that said ferrule is held in a condition where a tip end of said optical fiber positioning and fixing portion of said ferrule, to which the optical fiber of said optical cord is fixed, is extended from the tip end of said front housing, said flange portion is restricted forward movement by the flange portion holding portion of the front housing and is biased frontward by said coil spring, said coil spring is biased frontward by the coil spring holding portion of said rear housing, and said optical cord fixing member, to which said optical cord is fixed, is fixed and held by said optical cord fixing member holding hole of said rear housing.