| 摘要 |
PURPOSE: To provide an extending cam mechanism for a zoom lens barrel, which not only secures the extent of movement of lenses and movement precision but also makes a cam ring small-sized. CONSTITUTION: In the extending cam mechanism for the zoom lens barrel, a plurality cam grooves having the same basic locus are formed in the cam ring in positions different in the direction of an optical axis and in the circumferential direction, and a plurality of cam followers to be engaged with the plurality of cam grooves respectively are formed in a linear motion ring in positions different in the direction of the optical axis and in the circumferential direction.
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