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    • 20. 发明专利
    • FOCUS SYSTEM FOR ZOOM LENS
    • JPH04235511A
    • 1992-08-24
    • JP1373491
    • 1991-01-11
    • FUJI PHOTO FILM CO LTD
    • CHO MICHIOIWASAKI YOICHINAKA YOUJI
    • G02B7/08G02B7/10
    • PURPOSE:To improve the focus accuracy of a zoom lens even when a compensator lens is moved for the correction of a focus face and further for focusing. CONSTITUTION:In the focus system of a zoom lens in which focusing function is given to a rear group of lenses 21 functioning as a compensator lens to correct the movement of a focus face accompanied with the movement of a front group of lenses 20 functioning as a variator lens, CPU calculates the optimal position of the frame 29 of a rear group of lenses on both a subject distance detected by a distance measuring device and the movement of the front group of lenses 20 detected by a potentiometer 33, and judges whether the optimal position is a position where a motor 26a for driving the rear group of lenses can stop the frame 29 of the rear group of lenses or not, and in the case of the optimal position where the frame 29 can not stop, calculates the optimal position of the front group of lenses 20 to a position where the frame 29 can stop to move the front group of lenses 20 to the above optimal position.