High variable-power ratio, high aperture ratio, zoom optical sys

Details High variable-power ratio, high aperture ratio, zoom optical sys High variable-power ratio, high aperture ratio, zoom optical sys

1996-08-13

1997-11-11

Malley, Daniel P.

Photography

Having variable focal length of camera objective

Having focus operation

396 72, 396451, 396462, 359676, 359686, 359695, G02B 1514

Patent

active

056874014

ABSTRACT:
A first zoom lens group, a second zoom lens group, a third zoom lens group and a fourth zoom lens group are arranged on an optical axis in that order from an object side. The first zoom lens group has a negative lens and a positive lens arranged in that order from the object side, the first zoom lens group as a whole acting as a zoom lens group having a positive focal length. The second zoom lens group has a negative lens and a positive lens arranged from the object side in that order, the second zoom lens group as a whole acting as a zoom lens group having a negative focal length. The third zoom lens group has a double concave lens and a double convex lens arranged in that order from the object side, the third zoom lens group as a whole acting as a zoom lens group having a positive focal length, the third zoom lens group being provided with a diaphragm. The fourth zoom lens group has a positive lens and a negative lens arranged from the object side in that order, the fourth zoom lens group as a whole acting as a zoom lens group having a negative focal length.

REFERENCES:
patent: 4576444 (1986-03-01), Kawamura
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patent: 4653873 (1987-03-01), Kawamura
patent: 4673259 (1987-06-01), Kawamura
patent: 5379154 (1995-01-01), Shibayama et al.
patent: 5434712 (1995-07-01), Ito
patent: 5440429 (1995-08-01), Kim
patent: 5446592 (1995-08-01), Kohno et al.
patent: 5459616 (1995-10-01), Kawamura et al.
patent: 5477297 (1995-12-01), Suzuki
English Book, "Fundamentals of Optics," 4th Edition, by Francis A. Jenkins & Harvey E. White, McGraw-Hill Book Company.

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