Wide-angle type zoom lens having inner-focus lens

Details Wide-angle type zoom lens having inner-focus lens Wide-angle type zoom lens having inner-focus lens

1990-01-26

1991-03-19

Sugarman, Scott J.

350427, 350432, G02B 15177, G02B 1318

Patent

active

050005502

ABSTRACT:
A zoom lens includes a first lens group having a negative refractive power and having an object-side sub-group stationary during focusing and an image-side sub-group arranged to move for focusing purposes, and a second lens group having a positive refractive power and arranged on the image side of the first lens group, wherein the first lens group and the second lens group move axially at the same time and in differential relation for zooming purposes.

REFERENCES:
patent: 4527867 (1985-07-01), Fujioka et al.
patent: 4653873 (1987-03-01), Kawamura
patent: 4752121 (1988-06-01), Kitagishi
patent: 4848883 (1989-07-01), Maruyama

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