| 摘要 |
Provided is a lens barrel, which can be further reduced by providing such a first helicoid as can be easily manufactured even in the zone of a small lead. The lens barrel (1) comprises a first barrel member (6) having a first helicoid (18, 25 and 26) formed in a first face (6a), and a second barrel member (21) having a second helicoid (24) formed in a second face (21a) confronting the first face (6a). The lens barrel is characterized in that the first barrel member (6) has, in the first face (6a), a first zone (Z1), in which the first helicoid (18, 25 and 26) has a first lead, and a second zone (Z2 and Z3), in which the first helicoid (18 and 25) has a second lead smaller than the first lead, and in that the first helicoid (18 and 25) having the second lead has a smaller thread number than that of the first helicoid (18, 25 and 26) having the first lead.
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