Zoom lens

Details Zoom lens Zoom lens

1983-02-28

1985-06-25

Corbin, John K.

G02B 1500

Patent

active

045250367

ABSTRACT:
A zoom lens having, from front to rear, a 1st lens group having a positive refractive power for focusing, a 2nd lens group of negative refractive power having a magnification changing function, a 3rd lens group having a negative refractive power for compensating for the image shift resulting from the change of the magnification, and a 4th lens group of positive refractive power having an image forming function, the aforesaid 4th lens group having two lens groups with the front or 4-1st lens group and the rear or 4-2nd lens group. The form and construction and arrangement of the lens elements of the aforesaid 4-1st and the aforesaid 4-2nd lens groups are properly set forth so as to achieve good correction of aberrations and, at the same time, limiting the bulk and size of the entire system to a minimum.

REFERENCES:
patent: 3961845 (1976-06-01), Doi et al.
patent: 3997244 (1976-12-01), Takano
patent: 4033674 (1977-07-01), Sekiguchi

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