Zoom lens
AssigneeCanon Kabushiki Kaisha
InventorShingo Hayakawa
Life of this patent
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Abstract
A zoom lens includes, in order from as object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens having a positive or negative refractive power, a fifth lens unit having a negative refractive power, and a sixth lens unit having a positive refractive power, and a sixth lens unit having a positive refractive power, wherein the separations between the lens units are varied to effect zooming. Further, the fifth lens unit is arranged to move in directions substantially perpendicular to the optical axis to compensate vibrations.
Claims21
A zoom lens comprising, in order from an object side, an object-side lens group having a plurality of lens units in which separations therebetween are varied during zooming and which have a positive refractive power as a whole, an intermediate lens unit having a negative refractive power and arranged to move in directions substantially perpendicular to an optical axis so as to compensate unexpected vibrations, and a rear lens unit having a positive refractive power, wherein besides the separations between said plurality of lens units of said object-side lens group, at least a separation between said intermediate lens unit and said rear lens unit is varied to effect zooming, and
- wherein at least one lens unit included in said object-side lens group is moved along the optical axis to effect focusing, and a lens unit of said plurality of lens units of said object-side lens group which is closest an object has a positive refractive power.
A zoom lens comprising, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a positive or negative refractive power, a fifth lens unit having a negative refractive power, and a sixth lens unit having a positive refractive power, wherein at least four of separations between successive two of said lens units are varied to effect zooming, and said fifth lens unit is arranged to move in directions substantially perpendicular to an optical axis so as to compensate unexpected vibrations.
A zoom lens comprising, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a positive refractive power, a fifth lens unit having a negative refractive power, and a sixth lens unit having a positive refractive power, wherein, letting air separations at a wide-angle end and a telephoto end between the n-th lens unit and the (n+1)-th lens unit be denoted by D.sub.nW and D.sub.nT, respectively, during zooming from the wide-angle end to the telephoto end, said air separations are varied so as to satisfy the following conditions:
- D.sub.1W <D.sub.1T
- D.sub.2W >D.sub.2T
- D.sub.4W <D.sub.4T
- D.sub.5W >D.sub.5T.
A zoom lens 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, a fourth lens unit of negative refractive power, a fifth lens unit of negative refractive power and a sixth lens unit of positive refractive power, wherein, during zooming from a wide-angle end to a telephoto end, letting air separations at the wide-angle end and the telephoto end between the i-th lens unit and the (i+1)-th lens unit be denoted by D.sub.iW and D.sub.iT, respectively, the following conditions are satisfied:
- D.sub.1W <D.sub.1T
- D.sub.2W >D.sub.2T
- D.sub.3W <D.sub.3T
- D.sub.4W <D.sub.4T
- D.sub.5W >D.sub.5T.
A zoom lens comprising, in order from an object side:
- an object-side lens group having a plurality of lens units in which separations therebetween are varied during zooming and which have a positive refractive power as a whole;
- an intermediate lens unit having a negative refractive power and arranged to move in directions substantially perpendicular to an optical axis so as to compensate unexpected vibrations;
- and
- a rear lens unit having a positive refractive power,
- wherein besides the separations between said plurality of lens units of said object-side lens group, at least a separation between said intermediate lens unit and said rear lens unit is varied to effect zooming, and
- wherein said rear lens unit is disposed closest to the image side, and a lens unit of said plurality of lens units of said object-side lens group which is closest an object has a positive refractive power.
Dependencies are inferred from the claim text.