| 摘要 |
A cam barrel 19 rotates in one way in varying a power to move four lens holding frames in the same direction by displacements of four cam openings 33 to 36 . Cam barrel cam followers 48 are provided on an outer periphery of the cam barrel 19 . The cam barrel cam followers 48 are passed through cam barrel cam openings 47 provided to a fixed barrel being arranged on an outer periphery of the cam barrel 19 , and engage with a power variation driving ring arranged on an outer periphery of the fixed barrel. The power variation driving ring is used to rotate the cam barrel 19 and move respective lens holding frames. Since the cam barrel cam followers 48 engage with the cam barrel cam openings 47 , the cam barrel 19 is moved according to displacements of the cam barrel cam openings 47 while holding respective lens holding frames.
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