| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve such a problem that when a front group inclines due to a position difference, a change difference in the inclination relative to the other group increases, resulting in degradation in optical performance. Ž<P>SOLUTION: When the first group inclines due to a position difference, the other groups are inclined in the same direction in response to its sensitivity so as to cancel that inclination. The second group lens barrel is fitted on the internal circumference of a rectilinear cylinder. A focus cam ring with which the second group lens barrel engages is engaged with and held by a taper roller elastically biased. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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