System of focusing zoom lens

Details System of focusing zoom lens System of focusing zoom lens

1995-10-17

1998-04-07

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359687, G02B 1514

Patent

active

057371270

ABSTRACT:
A zoom lens includes a front lens group, a zooming lens group and relay lens group arranged in this order from the object side. The zoom lens is focused by moving at least a part of the front lens group and a part of the relay lens group in the direction of the optical axis. The front lens group is moved so that the focusing movement of the front lens group for a given object point is smaller as compared with that by which the front lens group should be moved when the zoom lens is focused by moving solely the front lens group and the focusing error generated by such a movement of the front lens group is larger in the wide-side than the tele-side, and a part of the relay lens group is moved to correct the focusing error.

REFERENCES:
patent: 5136431 (1992-08-01), Terasawa et al.
patent: 5185678 (1993-02-01), Arimoto
patent: 5515204 (1996-05-01), Usui et al.

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