Zoom lens system for use in a compact camera

Details Zoom lens system for use in a compact camera Zoom lens system for use in a compact camera

1989-01-24

1990-03-06

Dzierzynski, P. M.

350427, 350432, G02B 1514

Patent

active

049060775

ABSTRACT:
In a zoom lens system of the type which includes a first lens group having a positive focal length and a second lens group having a negative focal length and which performs zooming by adjusting the distance between the two lens groups, the first lens group is composed of a first lens unit having a small power and having a positive or negative focal length and a second lens unit having a positive focal length, the first lens unit being of a two-group-two-element composition which comprises, in order from the object side, a first positive meniscus lens element having a convex surface of large curvature directed toward the object and a second meniscus lens element of large thickness that has a concave surface of large curvature on the object side and a convex surface of large curvature on the image plane side.

REFERENCES:
patent: 4720179 (1988-01-01), Ito
patent: 4818081 (1989-04-01), Ito
patent: 4836660 (1989-06-01), Ito
patent: 4838669 (1989-06-01), Ogata et al.

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