Zoom lens

Details Zoom lens Zoom lens

1995-04-21

1996-07-16

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359689, G02B 1514

Patent

active

055372597

ABSTRACT:
A zoom lens includes at least a first lens group having a positive refracting power, a second lens group having a positive refracting power, and a third lens group having a negative refracting power in this order from the object side. Such zoom lens performs zooming by varying the distance between respective lens groups. Zooming from the wide angle end to the telephoto end is performed by moving the second and third lens groups toward the image plane side at different speeds, and focusing is performed by moving the second lens group. Various optical conditions are satisfied in the zoom lens.

REFERENCES:
patent: 4871243 (1989-10-01), Ogawa et al.
patent: 5002373 (1991-03-01), Yamanashi
patent: 5321552 (1994-06-01), Horiuchi et al.
patent: 5325233 (1994-06-01), Nakatsuji et al.
patent: 5402268 (1995-03-01), Tatsuno
patent: 5414562 (1995-05-01), Ueda

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