Zoom lens of reduced total length

Details Zoom lens of reduced total length Zoom lens of reduced total length

1984-11-19

1987-04-21

Corbin, John K.

G02B 1514

Patent

active

046591893

ABSTRACT:
In the disclosed zoom lens, a zoom section includes a number of lens units with at least one of the axial spacings between two successive lens units being variable for zooming, and an image forming section of positive power behind the zoom section includes a front lens unit of positive power and a rear lens unit of negative power. The front lens unit includes at least one positive lens, the rear lens unit includes at least one negative lens, and the image forming section satisfies the following conditions, with the power of the entire system taken as unity: ##EQU1## where .phi.a represents the power of a convergent surface A convex toward the front with its positive power being strongest in the front lens unit, .phi.b the power of a divergent surface B concave toward the front with its negative power being strongest in the rear lens unit, Ra and Rb the radii of curvature of the surfaces A and B respectively, D the air-reduced axial distance from the convergent surface A to the divergent surface B, and Fim the focal length of the image forming section.

REFERENCES:
patent: 4468098 (1984-08-01), Itoh

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