Zoom lens system for a limited conjugate distance

Details Zoom lens system for a limited conjugate distance Zoom lens system for a limited conjugate distance

1990-07-02

1992-10-20

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359679, 359681, 359689, G02B 1516, G02B 15177

Patent

active

051575523

ABSTRACT:
A zoom lens system for a limited conjugate distance comprises at least three lens units which can be divided into, from an object side to an image side, a front lens group having a positive refracting power and a rear lens group having a positive refracting power. An axial distance between the front lens group and the rear lens group varies by a focusing operation. A zooming operation is performed by one of the front lens group and the rear lens group including at least two lens units. The zoom lens system fulfills the condition of l=m wherein l represents an object focal length of the zoom lens system, and m represents an axial distance between an object point and an object principal point of the front lens group.

REFERENCES:
patent: 4025167 (1977-05-01), Ikeda
patent: 4193667 (1980-03-01), Yasukuni et al.
patent: 4592625 (1986-06-01), Uehara et al.
patent: 4636040 (1987-01-01), Tokumaru

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