Wideangle four group zoom lens

Details Wideangle four group zoom lens Wideangle four group zoom lens

1991-10-23

1992-07-21

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359740, G02B 1514

Patent

active

051328488

ABSTRACT:
A wideangle zoom lens has four lens groups including a first lens group having a negative refractive power, a second group having a positive refractive power, a third lens group having a negative refractive power and a fourth lens group having a positive refractive power. The first to fourth lens groups being arranged object side in that order. The zooming operation from a wideangle end to a telephoto end is performed by increasing the distance between the second and third lens groups while reducing the distance betwen the third and fourth lens groups. Zooming is performed by non-linearly moving the first lens group. The first to fourth lens groups are arranged to meet the following conditions:

REFERENCES:
patent: 4516839 (1985-05-01), Tokumaru
patent: 4591235 (1986-05-01), Tokumaru et al.
patent: 4653873 (1987-03-01), Kawamura
patent: 4687302 (1987-08-01), Ikemori et al.
patent: 4759617 (1988-07-01), Tokumaru et al.
patent: 4846562 (1989-07-01), Tokumaru et al.

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