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US 5,969,881 AGranted
Zoom lens system
AssigneeMinolta Co., Ltd.
InventorKenji Konno
Life of this patent
Estimating the term…
Abstract
A zoom lens system has, from the object side, a first lens unit and a second lens unit. The first lens unit has a negative optical power. The second lens unit has a positive optical power. The second lens unit includes front and rear lens units which each have a positive optical power. The front lens unit is shifted in a direction perpendicular to the optical axis to compensate for an image blurring. The zoom lens system fulfills the condition 0<.phi.2R/.phi.2F<1.0, where .phi.2R and .phi.2F represent optical powers of the rear and front lens units, respectively.
Claims14
A zoom lens system comprising, from an object side:
- a first lens unit having a negative optical power, said first lens unit being provided at an object side end of said zoom lens system;
- and
- a second lens unit having a positive optical power, said second lens unit being provided at an image side end of said zoom lens system and adjacent to said first lens unit, said second lens unit comprising, from the object side, a front lens unit having a positive optical power and a rear lens unit having a positive optical power,
- wherein said front lens unit is capable of being shifted along a direction perpendicular to an optical axis of said zoom lens system, and
- wherein the zoom lens system fulfills the following condition:
- 0<.phi.2R/.phi.2F<1.0
- wherein:
- .phi.2R represents an optical power of the rear lens unit;
- and
- .phi.2F represents an optical power of the front lens unit.
7 more elements
A zoom lens device comprising a zoom lens system, said zoom lens system comprising, from an object side:
- a first lens unit having a negative optical power, said first lens unit being provided at an object side end of said zoom lens system;
- and
- a second lens unit having a positive optical power, said second lens unit being provided at an image side end of said zoom lens system and adjacent to said first lens unit, said second lens unit comprising, from the object side, a front lens unit having a positive optical power and a rear lens unit having a positive optical power,
- wherein said front lens unit is capable of being shifted along a direction perpendicular to an optical axis of said zoom lens system,
- wherein a distance between said first lens unit and said second lens unit is varied during a zooming operation and a distance between said front lens unit and said rear lens unit is maintained during the zooming operation,
- wherein the zoom lens system fulfills the following condition:
- 0<.phi.2R/.phi.2F<1.0
- wherein:
- .phi.2R represents an optical power of the rear lens unit;
- and
- .phi.2F represents an optical power of the front lens unit,
- a detector which detects the vibration of the entire zoom lens system and outputs a detecting signal according to a result of the detection;
- an actuator which moves said front lens unit in a direction perpendicular to the optical axis according to the driving signal input therein;
- and
- a controller which outputs a driving signal to the actuator based on the detecting signal from the detector.
12 more elements
A zoom lens system comprising, from an object side:
- a first lens unit having a negative optical powers, said first lens unit being provided at an object side end of said zoom lens system;
- and
- a second lens unit having a positive optical power, said second lens unit being provided at an image side end of said zoom lens system and adjacent to said first lens unit, said second lens unit comprising, from the object side, a front lens unit having a positive optical power and a rear lens unit having a positive optical power, said second lens unit having an aperature diaphragm,
- wherein said rear lens unit is capable of being shifted along a direction perpendicular to an optical axis of said zoom lens system,
- wherein the zoom lens system fulfills the following condition:
- 0<.phi.2F/.phi.2R<1.0
- wherein:
- .phi.2F represents an optical power of the front lens unit;
- and
- .phi.2R represents an optical power of the rear lens unit.
7 more elements
A zoom lens device comprising a zoom lens system, said zoom lens system comprising, from an object side:
- a first lens unit having a negative optical power, said first lens unit being provided at an object side end of said zoom lens system;
- and
- a second lens unit having a positive optical power, said second lens unit being provided at an image side end of said zoom lens system and adjacent to said first lens unit, said second lens unit comprising, from the object side, a front lens unit having a positive optical power and a rear lens unit having a positive optical power,
- wherein said rear lens unit is capable of being shifted along a direction perpendicular to the optical axis of the zoom lens system,
- wherein a distance between said first lens unit and said second lens unit is varied during a zooming operation, and a distance between said front lens unit and said rear lens unit is maintained during the zooming operation, and
- wherein the zoom lens system fulfills the following condition:
- 0. <.phi.2F/.phi.2R<1.0
- wherein:
- .phi.2F represents an optical power of the front lens unit;
- and
- .phi.2R represents an optical power of the rear lens unit,
- a detector which detects the vibration of the entire zoom lens system and outputs a detecting signal according to a result of the detection;
- an actuator which moves said rear lens unit in a direction perpendicular to the optical axis according to the driving signal input therein;
- and
- a controller which outputs a driving signal to the actuator based on the detecting signal from the detector.
12 more elements
Dependencies are inferred from the claim text.