High variable magnification range zoom lens
AssigneeCanon Kabushiki Kaisha
InventorHiroshi Endo
Life of this patent
Estimating the term…
Abstract
A high variable magnification range zoom lens is disclosed, comprising, in the order from the 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 negative refractive power, a fifth lens unit having a positive refractive power, and a sixth lens unit having a negative refractive power, wherein letting the air separation between the i-th lens unit and the (i+1)st lens unit in the wide-angle end and the telephoto end be denoted by D.sub.iW and D.sub.iT, respectively, zooming from the wide-angle end to the telephoto end is performed so as to satisfy the following conditions: D.sub.1W <D.sub.1T D.sub.2W >D.sub.2T D.sub.3W <D.sub.3T D.sub.4W >D.sub.4T
Claims24
A high variable magnification range zoom lens comprising, in the order from the 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 negative refractive power, a fifth lens unit having a positive refractive power, and a sixth lens unit having a negative refractive power, wherein letting air separations between the i-th lens unit and the (i+1)st lens unit in a wide-angle end and a telephoto end be denoted by D.sub.iW and D.sub.iT, respectively, zooming from the wide-angle end to the telephoto end is performed by satisfying the following conditions:
- D.sub.1W <D.sub.1T
- D.sub.2W >D.sub.2T
- D.sub.3W <D.sub.3T
- D.sub.4W >D.sub.4T
A zoom lens comprising, in the order from the 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 positive refractive power, and
- a sixth lens unit of negative refractive power, wherein magnification variation from a wide-angle end to a telephoto end is performed by moving at least said first lens unit and said sixth lens unit toward the object side.
Dependencies are inferred from the claim text.