Zoom lens system

Details Zoom lens system Zoom lens system

1995-10-02

1998-04-28

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359674, G02B 1514, G02B 1502

Patent

active

057452989

ABSTRACT:
A zoom lens system includes first to fifth lens groups arranged in this order from the object side. The first, third and fifth lens groups are fixed. The second lens group is moved in the direction of the optical axis of the zoom lens system when zooming the zoom lens system and the fourth lens group is moved in the direction of the optical axis to correct change in the image position due to the zooming and to correct change in the image position due to change in the object distance. The first lens group has a positive refracting power, the second lens group has a negative refracting power, the third lens group has a negative refracting power, the fourth lens group has a positive refracting power and the fifth lens group has a positive refracting power.

REFERENCES:
patent: 4157211 (1979-06-01), Tanaka et al.
patent: 5061051 (1991-10-01), Miyamae
patent: 5095387 (1992-03-01), Horiuchi
patent: 5301064 (1994-04-01), Sugi et al.
patent: 5414562 (1995-05-01), Ueda
patent: 5537255 (1996-07-01), Tochigi

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