JPS6466606A - Coaxial joint structure for cylindrical body - Google Patents

Abstract

PURPOSE:To execute the alignment without requiring great skill by a small number of manhours, by inscribing and providing elastically a collar whose inside and outside peripheries are both shaped like a regular polygen, in a cylindrical holder, and circumscribing and attaching two cylindrical bodies in this collar. CONSTITUTION:An inner cylinder la and an outer cylinder 1b of a cylindrical holder 1 are formed so that the cross sections are circular, respectively. In this holder 1, a rod lens 3 being a first cylindrical body, and a ferrule being a second cylindrical body, which is opposed to an end face 3a of this lens 3, and formed like a cylinder whose diameter is almost the same as that of the lens 3 are attached coaxially. At the time of fixing coaxially these holder 1, lens 3 and ferrule 4, a collar 2 shose cross section is shaped like a regular polygon is used. In such a way, by forming the cross section of the color 2 as a regular polygen, an optimum space for inserting an adhesive agent 11 between the holder 1 and the cylindrical body such as the lens 3, etc. can be formed. In such a way, even if the adhesive agent goes to loose due to an environmental variation at the time of hardening the adhesive agent 11 and at the time of using after hardening, the eccentricity due to an axial shift does not occur.