Zoom lens system

Details Zoom lens system Zoom lens system

1995-03-06

1996-08-20

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, 359684, G02B 1515, G02B 1514

Patent

active

055484450

ABSTRACT:
A zoom lens system consists of a positive first lens group G1, a negative second lens group G2, a stop, a positive third lens group G3, a positive fourth lens group G4 and a positive fifth lens group G5 arranged in this order from the object side. The second and fourth lens groups G2 and G4 are moved with the other lens groups G1, G3 and G5 fixed when zooming. The focal length of the total lens system is changed by moving the second lens group G2 along the optical axis and the change in the image-forming position generated by the movement of the second lens group G2 is compensated for and the zoom lens system is focused by moving the fourth lens group G4 along the optical axis.
The following formulae (1) and (2) are satisfied,

REFERENCES:
patent: 5299064 (1994-03-01), Hamano et al.

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