| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-quality image-taking device whose image quality is maintained by constraining or preventing abrasion powders from entering an inside of a body tube. SOLUTION: A tapered portion 12b is formed adjacently to an external thread 12a in an outer circumference of an axial end of the body tube 12. Even if the externally-threaded portion 12a formed in the outer circumference of the body tube 12 and an internally-threaded portion 141b of a lens holder 14 are screwed together to produce the abrasion powders by the abrasion between the threaded portions, it can be constrained or prevented by means of the tapered portion 12b that the abrasion powders enter the inside of the body tube 12. COPYRIGHT: (C)2007,JPO&INPIT
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