| 摘要 |
A mechanism for longitudinally shifting a shiftable lens group in a zoom lens system, including a lever pivotally mounted in a frame having a rotatable pin on each end thereof, a terminal member mounted on the movable lens group having a groove therein extending perpendicular to the longitudinal axis of the lens system with one of the pins riding in the groove, a shift bar mounted in the frame movable only in parallel with the axis having a groove in one end thereof extending perpendicular to the axis with the other pin of the lever riding in the groove, and a rotatable mechanism in the frame for moving the shift bar longitudinally so that, upon such movement, the engagement of the pin in the groove of the bar pivots the levers so that the engagement of the other pin in the groove of the terminal member shifts the lens group longitudinally.
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