Zoom lens system

Details Zoom lens system Zoom lens system

1991-03-29

1992-12-29

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359676, 359682, 359753, G02B 15177

Patent

active

051756498

ABSTRACT:
A zoom lens system comprising, in the order from the object side, a front lens unit having a negative refractive power as a whole and a rear lens unit having a positive refractive power as a whole; and said rear lens unit comprising a first positive lens element, a second positive lens element having a convex surface on the image side, a third biconcave lens element and a fourth biconvex lens element, and the second lens element and the third lens element being cemented to each other so as to compose a cemented doublet, adapted so as to perform variation of focal length by varying the airspace reserved between said front lens unit and said rear lens unit.

REFERENCES:
patent: 4198128 (1980-04-01), Ogino
patent: 4540249 (1985-09-01), Mogami

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