Zoom lens capable of focusing on close range

Details Zoom lens capable of focusing on close range Zoom lens capable of focusing on close range

1995-12-29

1997-11-04

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359684, 359687, 359689, G02B 1522, G02B 1514

Patent

active

056846398

ABSTRACT:
A small zoom lens makes possible short distance focusing with a high zoom ratio and high performance using a simple lens barrel. A focusing second lens unit moves along the optical axis during focusing to the short distance object; a first lens unit is adjacent to and on the object side of the focusing lens unit; and a third lens unit is adjacent to and on the image side of the focusing lens unit. The second unit lens and the third lens unit move integrally together during zooming between a maximum wide-angle state and a maximum telephoto state. The focusing lens unit moves in conjunction with and relative to the second and third lens units. The first or the third lens unit has a positive focal length and the other has a negative focal length. Additionally, the first and third lens units satisfies the following condition:

REFERENCES:
patent: 4787719 (1988-11-01), Imai
patent: 5185678 (1993-02-01), Arimoto
patent: 5483380 (1996-01-01), Nozawa
patent: 5499141 (1996-03-01), Ohtake
patent: 5572365 (1996-11-01), Ito

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