Zoom lens system

Details Zoom lens system Zoom lens system

1992-08-21

1994-01-25

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

052820890

ABSTRACT:
The improved zoom lens system includes, in order from the object side, a first lens group having a positive power, a second and a third lens group each having a negative power and a fourth lens group having an overall positive power, the fourth lens group being composed of a first sub-group 4a and a second sub-group 4b, which zoom lens system performs zooming by moving the second lens group relative to the overall system, the third lens group being moved relative to the overall system in operative association with the zooming so as to correct the shifting of the image plane due to the zooming which zoom lens system satisfies specific conditions.

REFERENCES:
patent: 4518228 (1985-05-01), Sugiura
patent: 4525036 (1985-06-01), Fujibayashi et al.
patent: 4618219 (1986-10-01), Sugiura et al.
patent: 4765722 (1988-08-01), Aono
patent: 5146366 (1992-09-01), Mukaiya

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