Control device for a zoom lens system
First Claim
1. A control device for a zoom lens system having an optical system including a focus lens unit and a zoom lens unit coaxially arranged and movable along the optical axis of the optical sytstem, the position of the focusing lens unit being varied in accordance with the focal length of the optical system, the control device comprising:
- zoom adjusting means for moving said zoom lens unit along the optical axis in response to a zooming operation so as to vary the focal length of said optical system;
means pivotally mounted about a point and being pivotable in response to a focusing operation; and
,focus adjusting means having a portion coupled to said pivotable means and additionally coupled to said focus lens unit, said focus adjusting means being operated in response to movement of said pivotable means and in response thereto causing movement of said focus lens unit along said optical axis for a distance dependent upon the distance between said coupled portion and said pivoting point so as to adjust the focal point of said optical system, said focus adjustment means also being coupled to said zoom adjusting means so that said coupled portion is movable in response to operation of said zoom adjusting means so as to vary the distance between said coupled portion and said pivoting point in accordance with a variance in the focal length of said optical system caused by the zooming operation.
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Accused Products
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.
26 Citations
25 Claims
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1. A control device for a zoom lens system having an optical system including a focus lens unit and a zoom lens unit coaxially arranged and movable along the optical axis of the optical sytstem, the position of the focusing lens unit being varied in accordance with the focal length of the optical system, the control device comprising:
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zoom adjusting means for moving said zoom lens unit along the optical axis in response to a zooming operation so as to vary the focal length of said optical system; means pivotally mounted about a point and being pivotable in response to a focusing operation; and
,focus adjusting means having a portion coupled to said pivotable means and additionally coupled to said focus lens unit, said focus adjusting means being operated in response to movement of said pivotable means and in response thereto causing movement of said focus lens unit along said optical axis for a distance dependent upon the distance between said coupled portion and said pivoting point so as to adjust the focal point of said optical system, said focus adjustment means also being coupled to said zoom adjusting means so that said coupled portion is movable in response to operation of said zoom adjusting means so as to vary the distance between said coupled portion and said pivoting point in accordance with a variance in the focal length of said optical system caused by the zooming operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control device for a zoom lens system including an optical system having first, second and third lens groups coaxially arranged and positioned away from an object in such order, a fixed barrel, a first movable barrel carrying the first lens group and movable along the optical axis of the optical system, a second movable barrel carrying the second lens group and movable along the optical axis, and a third movable barrel carrying the third lens group and movable along the optical axis, for focusing the first to third movable barrels being moved as a unit by an amount dependent upon the focal length of the optical system selected by a zooming operation, the control device comprises:
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a first manually operable member for focusing; a second manually operable member for zooming; means for zoom control operable in response to operation of said second manual member so as to move said second and third movable barrels along the optical axis for select distances for varying the focal length of said optical system; means pivotable about a pivoting point lying in a plane parallel to the optical axis and being pivoted in response to operation of said first manual member; first focus adjustment means movable in a first direction parallel to the optical axis to move said first, second and third movable barrels along the optical axis as a unit for adjustment of the focal point of said optical system; and
,second focus adjustment means having a portion operatively coupled with said pivotable means, and said second means also being operatively coupled with said first movable member so as to be moved in the first direction with said portion in response to a pivoting of said pivotable means, such movement in the first direction being for an amount dependent upon the distance between said portion and said pivoting point, said second focus adjustment means also being operatively coupled with said zoom control means so as to be moved in a second direction perpendicular to the first direction independently of said first focus adjustment means in response to operation of said zoom control means to vary the distance between said portion and said pivoting point in accordance with a variance in the focal length. - View Dependent Claims (11, 12)
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13. A control device for an objective lens system of the type in which the focal length is variable in response to a zooming operation, the objective lens system having at least one lens group movable in response to a focus adjusting operation so that the amount of movement of such lens group for an object at the same distance varies in reliance upon the focal length adjusted, the control device comprising:
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zoom means responsive to a zooming operation for adjusting said objective lens system to vary its focal length; focus means coupled with said at least one lens group for adjusting the position of said lens group; control means angularly movable about a rotational axis in response to a focus adjusting operation and associated with said focus means at an associating point positioned at a distance from said rotational axis so as to determine the position of said focus means as a function of the angular position of said control means; and
,adjusting means for varying the distance between said associating point and said rotational axis in accordance with the focal length adjusted by said zoom means. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A control device for a varifocal objective lens system of the type in which the amount of focus adjustment varies as a function of the focal length of the system, said control device comprising:
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first operable means angularly movable about a rotational axis in response to a focus adjusting operation; second operable means movable in response to a focal length adjusting operation to vary the focal length of the system; focus control means for adjusting the focusing condition of said objective lens system in accordance with the angular position of said first operable means, said focus control means being coupled between said first and second operable means such that the distance from said rotational axis to an acting point where said first operable member acts on said focus control member varies in accordance with the movement of said second operable means so that the amount of adjustment for focusing for the same angular movement of said first operable means varies as a function of the focal length adjustment. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification