Zoom lens

Details Zoom lens Zoom lens

1996-04-19

1998-05-26

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359713, G02B 1514, G02B 302

Patent

active

057575568

ABSTRACT:
A zoom lens of compact form comprises, in order from an object side to an image side, a first lens unit of positive refractive power and a second lens unit of negative refractive power. The first lens unit includes a positive first lens of meniscus form convex toward the object side, a negative second lens, a negative third lens and a positive fourth lens. The second lens unit includes a positive fifth lens and a negative sixth lens. Zooming is effected by varying a separation between the first lens unit and the second lens unit, and the following conditions are satisfied:

REFERENCES:
patent: 4659186 (1987-04-01), Sato et al.
patent: 4818081 (1989-04-01), Ito
patent: 5175650 (1992-12-01), Takayama et al.
patent: 5229887 (1993-07-01), Hayashi et al.
patent: 5309285 (1994-05-01), Ito
patent: 5381270 (1995-01-01), Cho
patent: 5434712 (1995-07-01), Ito
patent: 5585971 (1996-12-01), Itoh

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