Zoom lens and electronic still camera using the same

Details Zoom lens and electronic still camera using the same Zoom lens and electronic still camera using the same

2006-04-04

2006-04-04

Mai, Huy (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

07023623

ABSTRACT:
It is an object to provide a zoom lens made of three groups having a zoom ratio of ×2.5 to ×3.2 if the object distance is ∞, an field angle at the wide-angle end of 60° to 70°, high resolution, and a short optical total length when not in use. The zoom lens is made of a first lens group (G1) with a negative power, a second lens group (G2) with a positive power, and a third lens group (G3) with a positive power, arranged in that order from an object side to an image plane (S) side. The first lens group (G1) is made of a first lens (L1) that is a negative meniscus lens whose surface with strong curvature is facing the image plane (S) side and a second lens (L2) that is a positive meniscus lens whose surface with strong curvature is facing the object side, arranged in that order from the object side. The second lens group (G2) is made of a third lens (L3) that is a positive lens whose convex surface is facing the object side, a fourth lens (L4) that is a positive lens, a fifth lens (L5) that is a negative lens, and a sixth lens (L6) that is a plano-convex lens whose convex surface is facing the image plane (S) side, arranged in that order from the object side. The third lens group (G3) is made of a single seventh lens (L7) that is a positive lens.

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