Zoom lens of internal focusing system

Details Zoom lens of internal focusing system Zoom lens of internal focusing system

1991-11-07

1993-12-21

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, 359686, G02B 1514

Patent

active

052725642

ABSTRACT:
Disclosed is a zoom lens of an internal focusing system, comprising: a positive focusing lens group positioned close to an object and incorporating a focusing function; and a zoom variable power optical system including a negative variable power lens group disposed towards an image of the focusing lens group and having such a variable power function as to be movable along an optical axis. The focusing lens group includes, sequentially from an object, a first lens element having a positive refractive power, a second lens element having a positive refractive power and movable along an optical axis and a third lens element having a negative refractive power. Only the second lens element is moved along the optical axis to change a synthetic focal distance of the focusing lens group, thus effecting focusing.

REFERENCES:
patent: 3598476 (1971-08-01), Hengold
patent: 3796481 (1974-03-01), Fujii
patent: 4871240 (1989-10-01), Suda
patent: 5002373 (1991-03-01), Yamanashi
patent: 5059007 (1991-10-01), Tanaka

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