Control device for a zoom lens system

Details Control device for a zoom lens system Control device for a zoom lens system

1975-02-18

1976-01-06

Smith, Alfred E.

350255, G02B 1500

Patent

active

039307204

ABSTRACT:
A control device for a varifocal lens system of a type which includes an optical system having a lens group movable along the optical axis thereof and in which the amount of the movement of the movable lens group necessary for focusing is varied in response to the focal length of the optical system selected by the zooming operation. The control device includes a member pivotable about a point in response to the focusing operation, a first movable member having a portion operatively coupled to the pivotable member, and a second movable member operatively coupled with the movable lens group. The first movable member is movable in a first direction perpendicular to the optical axis in response to the zooming operation for varying the distance from the portion of the first movable member to the pivoting point of the pivotable member. The first movable member is also movable integrally with the second movable member, in a second direction parallel with the optical axis in response to a pivoting of the pivotable member for moving the movable lens group along the optical axis for focusing. In this manner, the amount of movement of the movable lens group is varied in accordance with the distance from the portion of the first movable member to the pivoting point of the pivotable member.

REFERENCES:
patent: 3059534 (1962-10-01), Keznickl
patent: 3095750 (1963-07-01), Mahn
patent: 3185029 (1965-05-01), Peck
patent: 3399943 (1968-09-01), Barr et al.
patent: 3450019 (1969-06-01), Rossellini

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