Zoom lens device
For example, JP Hei. 4-57007 A discloses a zoom lens device including a cam mechanism, which causes a lens group held by the lens holding frame to move in an optical axis direction by rotating a cum barrel with respect to a fixed barrel during varying of power and guiding a cam follower provided on the lens holding frame to an intersection point between a cam face provided spirally on the cam barrel and a straight moving guiding face provided in the fixed barrel.
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