Electro-mechanical transducer lens drive mechanism for a vibration compensating lens system
AssigneeMinolta Co., Ltd.
InventorTetsuro Kanbara
Life of this patent
Estimating the term…
Abstract
A lens system for compensating for shaking movement of a camera includes an objective lens system that forms the image and a compensating lens system interposed in the optical axis of the objective lens system. The compensating lens elements are driven by electro-mechanical transducers, which provides a compact system permitting a relatively small lens construction. A driving shaft is frictionally coupled to a support for the compensating lens elements and is attached to an electro-mechanical transducer, for example, a piezoelectric element that expands and contracts responsive to a pulse wave. A movement detector monitors the objective lens system and calculates an amount of shaking compensation needed, which is provided to a pulse generator.
Claims23
A lens apparatus, comprising:
- an objective lens system;
- a compensation lens system for preventing image blurriness;
- support means for supporting said compensation lens system;
- a driving member coupled to said support means to drive said support means and being disposed such that a moving axis of the driving member passes through a center of gravity of said compensation lens system, said driving member being movable in a direction perpendicular to an optical axis of said objective lens system;
- a transducer fixed to said driving member and being disposed in the same plane as said support means and on the same axis as the moving axis of said driving member, for producing incremental displacement of said driving member responsive to an impressed driving pulse and cumulative displacement comprising a multiple of said incremental displacement in response to plural impressed driving pulses;
- and
- a pulse generator for generating driving pulses that are applied to said transducer.
A lens apparatus, comprising:
- an objective lens system;
- a compensation lens system for preventing image blurriness;
- support means for supporting said compensation lens system;
- a driving member coupled to said support means to drive said support means and being disposed such that a moving axis of the driving member passes through a center of gravity of said compensation lens system, said driving member being movable in a direction perpendicular to an optical axis of said objective lens system;
- a transducer fixed to said driving member and being disposed in the same plane as said support means and on the same axis as the moving axis of said driving member for producing incremental displacement of said driving member responsive to an impressed driving pulse and cumulative displacement comprising a multiple of said incremental displacement in response to plural impressed driving pulses;
- detection means for detecting an amount of shaking movement of said objective lens;
- and
- a pulse generator for generating driving pulses to be applied to said transducer in accordance with said amount of shake.
A lens driving apparatus, comprising:
- a lens;
- support means for supporting said lens;
- a driving member coupled to said support means and disposed such that a moving axis of the driving member passes through a center of gravity of said lens, said driving member being movable in a direction perpendicular to an optical axis of said lens;
- a transducer fixed to said driving member and being disposed in the same plane as said support means and on the same axis as the moving axis of said driving member for producing incremental displacement of said driving member responsive to an impressed driving pulse and cumulative displacement comprising a multiple of said incremental displacement in response to plural impressed driving pulses, whereby said lens is driven in a direction perpendicular to an optical axis of the lens;
- and
- a pulse generator for generating driving pulses to be applied to said transducer.
Dependencies are inferred from the claim text.