Zoom lens

Details Zoom lens Zoom lens

1993-03-04

1995-03-14

LaRoche, Eugene R.

Optical: systems and elements

Lens

With variable magnification

359683, 359684, 359685, 359713, G02B 1514

Patent

active

053981359

ABSTRACT:
A zoom lens is constructed by two lens groups in which a first lens group having a positive focal length is arranged on an object side and a second lens group having a negative focal length is arranged on an image side. A zooming operation is performed by changing a distance between the first and second lens groups. The first lens group has first to fourth lenses sequentially arranged from the object side toward the image side. The first lens is constructed by a positive meniscus lens having a convex face directed onto the object side. The second lens is constructed by a biconcave lens. The third lens is constructed by a positive lens. The fourth lens is constructed by a biconvex lens. The second lens group has fifth to seventh lenses sequentially arranged from the object side toward the image side. The fifth lens is constructed by a positive meniscus lens having a convex face directed onto the image side. The sixth lens is constructed by a negative meniscus lens having a convex face directed onto the image side. The seventh lens is constructed by a negative meniscus lens having a convex face directed onto the image side.

REFERENCES:
patent: 4838669 (1989-06-01), Ogata et al.
patent: 4906077 (1990-03-01), Ito
patent: 5109299 (1992-04-01), Kato
patent: 5243466 (1993-07-01), Lee

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