Zoom lens system

Details Zoom lens system Zoom lens system

1994-08-17

1996-11-05

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359679, 359684, 359686, 359689, G02B 1514

Patent

active

055723659

ABSTRACT:
A zoom lens system has at least three lens groups in which two lens groups are moved together during the zooming operation. One of the two lens groups moved has a small degree of contribution to the variation of magnification and is referred to as lens group .alpha. The other lens group moved has a large degree of contribution to the variation of magnification and is referred to as lens group .beta.. Lens groups .alpha. and .beta. have focusing sensitivities K.alpha. and K.beta. of different signs on the telephoto extremity, and the relationships:

REFERENCES:
patent: 4978204 (1990-12-01), Ito
patent: 5148321 (1992-09-01), Goto et al.
patent: 5233472 (1993-08-01), Haraguchi et al.
patent: 5260833 (1993-11-01), Ito et al.

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