Zoom lens systems

Details Zoom lens systems Zoom lens systems

1993-10-27

1996-01-16

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359739, 359740, G02B 1514

Patent

active

054853133

ABSTRACT:
Zoom lens systems for use with moderately large image formats, such as those found in instant photography cameras, are provided. The systems include three lens units arranged in a negative/positive
egative power sequence and have a fixed aperture stop associated with the unit nearest the image. The positive unit is used for zooming and either the first or the third negative unit is used for compensating and focusing. Alternatively, the negative unit nearest the image is used for compensating and the negative unit farthest from the image is used for focusing. The systems achieve a long back focal length, a short front vertex to image distance, and in their simplest embodiments can consist of just three lens elements.

REFERENCES:
patent: 4198127 (1980-04-01), Itoh
patent: 4304466 (1981-12-01), Betensky
patent: 4412725 (1983-11-01), Tachihara et al.
patent: 4586793 (1986-05-01), Tanaka et al.
patent: 4776228 (1988-10-01), Razzacki et al.
patent: 5357374 (1994-10-01), Ohno

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