Zoom lens barrel with single-ring continuous focusing

Details Zoom lens barrel with single-ring continuous focusing Zoom lens barrel with single-ring continuous focusing

1981-10-02

1984-03-27

Henry, Jon W.

350255, 350429, G02B 710

Patent

active

044390190

ABSTRACT:
A zoom lens barrel includes an optical system including a forward group lens and a rearward group lens, the forward group lens comprising a first lens group and a second lens group, and means for driving the forward group lens in the direction of the optical axis for focusing. The driving means includes an operating member, a first holding member holding the first lens group and movable in the direction of the optical axis in response to the operating member, a second holding member holding the second lens group and movable in the direction of the optical axis, and means responsive to movement of the first holding member to move the second holding member while varying the spacing between the first lens group and the second lens group.

REFERENCES:
patent: 3784285 (1974-01-01), Watahabe et al.
patent: 4154511 (1979-05-01), Maekawa
patent: 4175831 (1979-11-01), Ito
patent: 4193667 (1980-03-01), Yasukuni et al.
patent: 4266860 (1981-05-01), Hayashi
patent: 4273423 (1981-06-01), Vesugi
patent: 4286845 (1981-09-01), Kamata
patent: 4309076 (1982-01-01), Ito
patent: 4318593 (1982-03-01), Tsuji et al.

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