Four-unit zoom lens system having a high zoom ratio
AssigneeOlympus Optical Co., Ltd.
InventorYasuji Ogata
Life of this patent
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Abstract
The invention provides a four-unit type of zoom lens system which is of compact size albeit having a high zoom ratio, and comprises a first unit G1 of positive refracting power, a second unit G2 of positive refracting power, a third unit G3 of negative refracting power, and a fourth unit G4 of negative refracting power, wherein the spaces between the units vary during zooming, said zoom lens system being characterized in that all these units are moved toward the object side for zooming from the wide-angle to telephoto end.
Claims39
A four-unit type zoom lens system having a high zoom ratio, consisting essentially of, in order from an object side of an optical axis:
- a first lens unit having positive refracting power,
- a second lens unit having positive refracting power,
- a third lens unit having negative refracting power, and
- a fourth lens unit having negative refracting power;
- wherein said first, second, third, and fourth lens units are all movable toward the object side of the optical axis for zooming from a wide-angle end to a telephoto end of the lens system.
A four-unit type zoom lens system having a high zoom ratio, which comprises, in order from an object side of an optical axis:
- a first lens unit having positive refracting power,
- a second lens unit having positive refracting power,
- a third lens unit having negative refracting power, and
- a fourth lens unit having negative refracting power;
- and
- wherein said first, second, third, and fourth lens units are all movable toward the object side of the optical axis for zooming from a wide-angle end to a telephoto end of the lens system, and wherein a space between said second and third lens units becomes relatively narrower during said zooming from the wide-angle end to the telephoto end.
A four-unit type zoom lens system having a high zoom ratio, which comprises in order rom an object side of an optical axis:
- a first lens unit having positive refracting power,
- a second lens unit having positive refracting power,
- a third lens unit having negative refracting power, and
- a fourth lens unit having negative refracting power;
- wherein said first, second, third and fourth lens units are all movable toward the object side of the optical axis for zooming from a wide-angle end to a telephoto end of the lens system, and wherein a space between said third and fourth lens units becomes relatively wider during zooming from the wide-angle end to the telephoto end of the lens system.
Dependencies are inferred from the claim text.