Zoom lens

Details Zoom lens Zoom lens

1988-08-17

1989-05-23

Corbin, John K.

350423, G02B 1514

Patent

active

048324710

ABSTRACT:
A zoom lens including, from front to rear, a first lens unit of positive power for focusing, a second lens unit of negative power having the function of varying the image magnification, a third lens unit of negative power for compensating for the image shift resulting from the variation of the image magnification, a fourth lens unit of positive power receptive of the diverging light bundle from the first lens unit for producing an almost parallel light bundle, and a fifth lens unit having the function of forming an image on the focal plane, wherein the aperture ratio is increased to 1.4 in F-number, the magnification range is extended to about 10, and high grade imaging performance is preserved.

REFERENCES:
patent: 4066340 (1978-01-01), Besenmatter et al.
patent: 4217033 (1980-08-01), Gobl
patent: 4621905 (1986-11-01), Kato et al.
patent: 4699474 (1987-10-01), Ozawa
patent: 4720181 (1988-01-01), Hata
patent: 4770510 (1988-09-01), Mukaiya

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