Aberrational deterioration prevented zoom lens

Details Aberrational deterioration prevented zoom lens Aberrational deterioration prevented zoom lens

1984-11-27

1987-11-10

Corbin, John K.

350423, 350450, G02B 1514

Patent

active

047053631

ABSTRACT:
An aberrational deterioration preventing zoom lens comprising a lens group axially movable for zooming, another lens group axially movable for zooming which has a plurality of lens units, an aperture diaphragm on the object side of the rear lens unit having an opening the size of which is variable to determine the F-number of the entire system, and an optical stop lying on the image side of the rear lens unit which positions an intersection P at which a marginal ray of the on-axial pencil corresponding to the full aperture and an upper marginal ray of the off-axial light pencil going to the margin Q of an image plane intersect each other, to restrict the on-axial light flux.

REFERENCES:
patent: 3918797 (1975-11-01), Tanano
patent: 3918798 (1975-11-01), Takano
patent: 4159864 (1979-07-01), Yasukuni et al.
patent: 4432615 (1984-02-01), Ikemori

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