Zoom lens system
AssigneeHoya Corporation
InventorsTetsuya Abe, Masaru Eguchi
Life of this patent
Estimating the term…
Abstract
A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. The second sub-lens group is a negative single lens element serving as an image-stabilizer lens group which moves in directions orthogonal to the optical axis to change the imaging position to correct image shake.
Claims11
A zoom lens system comprising a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, the distance between said first lens group and said second lens group decreases, and the distance between said second lens group and said third lens group increases,
- wherein said second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side, and
- wherein said second sub-lens group comprises a negative single lens element which serves as an image-stabilizer lens group which is moved in a direction orthogonal to the optical axis to change the imaging position of said zoom lens system in order to correct image shake.
A zoom lens system comprising a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, the distance between said first lens group and said second lens group decreases, and the distance between said second lens group and said third lens group increases,
- wherein said second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side,
- wherein said second sub-lens group serves both as an image-stabilizer lens group that corrects image shake by moving in a directions orthogonal to the optical axis to change the imaging position, and as a focusing lens group which moves in the optical axis direction during a focusing operation.
Dependencies are inferred from the claim text.