Zoom lens

Details Zoom lens Zoom lens

1996-11-26

1998-02-10

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359683, 359685, G02B 1514

Patent

active

057175276

ABSTRACT:
A zoom lens comprises a first lens group having a positive refracting power, a second lens group having a negative refracting power, and a third lens group having a positive refracting power, disposed in the named order from the object side, wherein the first lens group has a 1-1 lens group having a negative refracting power and a 1-2 lens group having a positive refracting power, disposed in the named order from the object side, wherein zooming from a wide angle end to a telephoto end is effected by increasing a gap between the first lens group and the second lens group and reducing a gap between the second lens group the third lens group, while fixing the first lens group, wherein focusing from infinity to near is effected by moving the 1-1 lens group to the object side; and

REFERENCES:
patent: 3632188 (1972-01-01), Nakamura
patent: 4124274 (1978-11-01), Tanaka et al.
patent: 5583700 (1996-12-01), Usui et al.

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