| 摘要 |
PROBLEM TO BE SOLVED: To prevent the contamination of an optical fiber and to protect a sleeve housing and the optical fiber against damage by connecting landings to a bore extending in the longitudinal direction and tapering these landings toward the second end of a longitudinally long member, and making the landings surely hold the sleeve housing in the central bore of the longitudinally long member. SOLUTION: The longitudinally long member 18 includes the central bore 22 which is delineated at the first end 18a and extends in the longitudinal direction and the plural landings 24 which are continuous with or adjacent to the central bore 22. The plural landings 24 are tapered from the first end 18a toward the second end 18b of the longitudinally long member 18. When a dust cover 10 is arranged in an adapter, the dust cover is aligned within the adapter by the rectangular cross section of the longitudinally long member 18 and the tapered outside surface of the longitudinally long member 18. When the dust cover 10 is slid in the adapter, the sleeve housing engages the tapered landings 24 and is tightly engaged by the landings 24.
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