Zoom lens system

Details Zoom lens system Zoom lens system

1993-03-30

1994-03-22

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359698, 354402, 348345, G02B 1514

Patent

active

052969703

ABSTRACT:
A compensator lens is driven by a second driving means such that the rear end of the focal depth of an object image at infinity coincides with a surface of image-formation irrespective of the movement of a variable lens when the object image is photographed. With this arrangement, the whole range of the focal depth can be effectively utilized, so that the range of photographing can be enlarged without focussing immediately after the power source is turned on as compared with the conventional zoom lens system. That is, even an object disposed at a close distance can be photographed without focussing as compared with the conventional zoom lens system which can utilize only the substantially half length of the focal depth. Furthermore, even when the object disposed at the closest distance is photographed, focussing can be made in a short period of time as compared with the conventional zoom lens system.

REFERENCES:
patent: 4351590 (1982-09-01), Hirata et al.
patent: 4870439 (1989-09-01), Tsuboi et al.
patent: 5005956 (1991-04-01), Kaneda et al.

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