Compact zoom lens

Details Compact zoom lens Compact zoom lens

1990-02-27

1991-10-29

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1500

Patent

active

050610511

ABSTRACT:
A zoom lens comprising, in order from an object side, a first lens group having a positive refracting power, a second lens group having a negative refracting power and movable to vary the power, a third lens group having a negative refracting power and movable to compensate for deviation of an image position caused by varying the power, a fourth lens group having a positive refracting power for making a divergent luminous flux which exits from the third lens group substantially afocal, and a fifth lens group having a positive refraction power to an image, wherein the fourth lens group includes at least one positive single lens having a strong convex surface on the image side, the fifth lens group arranged behind a diaphragm between the fourth and the fifth lens groups and the fifth lens group comprises, in order from an object side, a front unit having a positive refracting power and a rear unit having a refracting power arranged in an air spaced relation with the front unit.

REFERENCES:
patent: 4770510 (1988-09-01), Mukaiya
patent: 4824226 (1989-03-01), Tanaka

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