| 摘要 |
PURPOSE: To obviate the occurrence of peeling of adhesion between the outer peripheral surface of a ferrule and a spring mounting member and the fracture of an optical fiber in the ferrule by specifying the surface roughness of the spring material part of the outer peripheral surface of the ferrule to a specific surface. CONSTITUTION: The joint part of the front end face 11 of the ferrule and the outer peripheral part 13 is provided with a sleeve insertion guide 14 and a through-hole 12 is formed in the central axial direction of the ferrule arriving at the rear end face 15 formed with a conical fiber insertion guide 16 from the front end face 11. Further, the surface roughness Ra of the outer peripheral surface is in a range of 0.1<Ra<25 and is specified to the relatively rough surface. The sizes of the ferrule are generally outside diameter D=ϕ2.5mm, length L=10.5mm, through-hole d=ϕ0.126mm diameter. The reason for making the surface roughness of the outer pheripheral surface Ra of the ferrule rougher than 0.1 lies in that the joint area at the time of adhering the surface to the spring mounting part is increased and the joint strength is increased by forming the outer peripheral surface as the rough surface.
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