Variable focal length optical system

Details Variable focal length optical system Variable focal length optical system

1995-07-17

1997-09-09

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

056662297

ABSTRACT:
A variable focal length optical system includes, in order from an 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 the lens groups are moved from a wide-angle end to a telephoto end, at least the first lens group and the fifth lens group are moved toward the object side. In this case, the air gap along an optical axis between the first lens group and the second lens group, and the air gap along an optical axis between the third lens group and the fourth lens group are increased, respectively. At the same time, the air gap along an optical axis between the fourth lens group and the fifth lens group is decreased. In the variable focal length optical system, at least one lens group among the second to fourth lens groups carries out a focusing operation.

REFERENCES:
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5126883 (1992-06-01), Sato et al.
patent: 5241421 (1993-08-01), Endo et al.

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