Zoom lens system

Details Zoom lens system Zoom lens system

1995-06-15

1996-07-23

Hellner, Mark

Optical: systems and elements

Lens

With variable magnification

359681, 359691, 359692, G02B 1514

Patent

active

055395813

ABSTRACT:
A zoom lens system including, in order from the object side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, in which zooming is effective by varying the spacing between the first lens unit and the second lens unit. The first lens unit has, in order from the object side, a negative meniscus lens element having a convex surface directed toward the object side, a negative lens element and a positive lens element. The second lens unit has, in order from the object side, a positive lens element having a convex surface directed toward the object side, a positive lens element, a cemented negative lens element composed of a positive lens element and a negative lens element, which are cemented together and a positive lens element. The first and second lens units and the elements thereof are positioned and arranged in prescribed relative positions.

REFERENCES:
patent: 5155629 (1992-10-01), Ito et al.
patent: 5452134 (1995-09-01), Sato

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