Zoom lens system

Details Zoom lens system Zoom lens system

1995-03-20

1996-06-11

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359676, 359707, 359740, G02B 1514

Patent

active

055261868

ABSTRACT:
A zoom lens system for projecting an image of an object on a screen, comprises, sequentially from a screen side, a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, a fourth lens group having a negative refracting power and a fifth lens group having a positive refracting power. The first lens group is so disposed as to be movable for focusing along an optical-axis direction. The second lens group is so disposed as to be movable for zooming along the optical-axis direction. The third lens group is so disposed as to be movable for correcting a fluctuation in image position due to the zooming. The fourth and fifth lens groups are fixed with respect to the optical-axis direction during the zooming. The third lens group has, sequentially from the screen side, a front lens unit having a negative refracting power and a rear lens unit having a positive refracting power.

REFERENCES:
patent: 3970367 (1976-07-01), Tsuji
patent: 4437732 (1984-03-01), Ishiyama
patent: 4637690 (1987-01-01), Miyamae et al.
patent: 4749266 (1988-06-01), Takahashi et al.
patent: 4854685 (1989-08-01), Corbasson
patent: 4896950 (1990-01-01), Endo et al.
patent: 5388004 (1995-02-01), Adachi
patent: 5440430 (1995-08-01), Sato

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