| 摘要 |
A cam device of a lens barrel having a cam follower member which satisfies the condition R>r2>r1, wherein R is the minimum radius of a cam curve of a cam which contributes to movement of a lens placed within the lens barrel, r1 is the radius of a cutter to form the cam, and r2 is the radius of a part of a cam follower member which contacts the cam curve and regulates movement of a lens, being a part other than that contacting a cam surface.
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