| 摘要 |
PROBLEM TO BE SOLVED: To obtain a ferrule 1 that has stable optical characteristics and that has no problem in appearance. SOLUTION: In a nearly cylindrical, zirconia ceramics-made optical fiber ferrule that has a through-hole for storing an optical fiber in the axial direction, a connecting part between the through-hole and the tip end face, before the optical fiber is fixedly stuck, is designed to have a radius of curvature R1 in the range of 0.0005 mm<=R1<=0.02 mm.
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