Five-element telescopic zooming lens

Details Five-element telescopic zooming lens Five-element telescopic zooming lens

1993-07-20

1995-08-08

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

054404304

ABSTRACT:
A five-element telescopic zooming lens system comprises, in the order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power. When a magnification factor is to be changed from a wide angle end to a telephoto end, an on-axis air gap between the first lens group and the second lens group is increased while an on-axis air gap between the second lens group and the third lens group is reduced and an on-axis air gap between the fourth lens group and the fifth lens group is reduced. The third lens group is linearly driven while it meets various conditions.

REFERENCES:
patent: 4702567 (1987-10-01), Kato et al.
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5126883 (1992-06-01), Sato et al.
patent: 5185678 (1993-02-01), Arimoto
patent: 5241421 (1993-08-01), Endo et al.

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