Zoom lens

Details Zoom lens Zoom lens

1996-05-23

1998-02-03

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359684, 359689, 359693, G02B 1514, G02B 1522

Patent

active

057150974

ABSTRACT:
A zoom lens structured so that a substantially constant amount of movement of a focusing lens group is required for focusing on objects at the same distance regardless of the zoom position even when an inner focusing method is implemented. The zoom lens includes in order from an object side, a first lens group which has a negative refractive power and a second lens group which has a positive refractive power, wherein zooming is executed by changing a distance between the first lens group and the second lens group, wherein the second lens group includes, in order from the object side, a front group which has a positive refractive power and a rear group which has a positive refractive power, and wherein focusing from an object at a far distance to an object at a close distance is executed by moving the front group towards an image side.

REFERENCES:
patent: 4726667 (1988-02-01), Tachihara
patent: 5276553 (1994-01-01), Tatsuno
patent: 5563739 (1996-10-01), Sato
patent: 5644435 (1997-07-01), Shikama

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