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US 6,606,194 B2Granted
Variable magnification optical system having image stabilizing function
AssigneeCanon Kabushiki Kaisha
InventorsHiroyuki Hamano, Hiroki Yoshida
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AssigneeCanon Kabushiki Kaisha
InventorsHiroyuki Hamano, Hiroki Yoshida
Estimating the term…
A variable magnification optical system having an image stabilizing function includes, in order from an object side to an image side, a fixed first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power. The second lens unit and the fourth lens unit are moved to effect variation of magnification. The third lens unit has a negative lens of meniscus form concave toward the image side and an aspheric surface, and the third lens unit is movable in a direction perpendicular to an optical axis to stabilize an image, or a lens sub-unit constituting part of the third lens unit is movable in the direction perpendicular to the optical axis to stabilize an image.
A variable magnification optical system having an image stabilizing function, comprising, in order from an object side, a fixed first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power, said second lens unit and said fourth lens unit being moved along an optical axis to effect variation of magnification, wherein said third lens unit comprises a first lens sub-unit of negative refractive power and a second lens sub-unit of positive refractive power, and said second lens sub-unit is made to move in a direction perpendicular to the optical axis to stabilize an image, said variable magnification optical system satisfying the following conditions:
A variable magnification optical system having an image stabilizing function, comprising, in order from an object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power, said second lens unit and said fourth lens unit being moved along an optical axis to effect variation of magnification, wherein said third lens unit comprises a first lens subunit of negative refractive power and a second lens subunit of positive refractive power, and said second lens sub-unit is made to move in a direction perpendicular to the optical axis to stabilize an image, said variable magnification optical system satisfying the following condition:
A. A variable magnification optical system having an image stabilizing function, comprising, in order from an object side, a fixed first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power, said second lens unit and said fourth lens unit being moved along an optical axis to effect variation of magnification, wherein said third lens unit comprises a first lens sub-unit of negative refractive power, a second lens sub-unit having at least one negative lens and whose overall refractive power is positive, and a third lens sub-unit including one positive lens, and said second lens sub-unit is made to move in a direction perpendicular to the optical axis to stabilize an image.
A zoom lens system comprising, in order from an object side to an image side:
A zoom lens system comprising, in order from an object side to an image side:
Dependencies are inferred from the claim text.