Zoom lens ranging to wide angles

Details Zoom lens ranging to wide angles Zoom lens ranging to wide angles

1995-12-22

1999-02-02

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359689, 359686, 359715, G02B 1514, G02B 302

Patent

active

058673253

ABSTRACT:
A small wide-angle zoom lens having good performance, in order from the object side, comprises at least a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and a third lens group G3 having a negative refractive power. During zooming from a maximum wide-angle state to a maximum telephoto state, each lens group can move toward the object side so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 decreases. The second lens group can comprise first, second and optional third lens group units. The zoom lens is configured to satisfy various conditions to achieve advantageous results.

REFERENCES:
patent: 4586792 (1986-05-01), Tanaka et al.
patent: 5175648 (1992-12-01), Mori
patent: 5270866 (1993-12-01), Oizumi
patent: 5276553 (1994-01-01), Tatsuno
patent: 5289317 (1994-02-01), Ikemori
patent: 5483380 (1996-01-01), Nozawa
patent: 5493447 (1996-02-01), Ohtake
patent: 5499141 (1996-03-01), Ohtake
patent: 5523888 (1996-06-01), Nishio
patent: 5539582 (1996-07-01), Kohno
patent: 5666230 (1997-09-01), Tatsuno

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