Zoom lens system

Details Zoom lens system Zoom lens system

1992-06-19

1993-12-14

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359676, 359680, 359683, G02B 1514

Patent

active

052708632

ABSTRACT:
A compact and light-weight zoom lens system including, in the order from the object side, a first lens unit having a negative refractive power, a second lens unit comprising a negative lens element and having a positive refractive power, and a third lens unit having a positive refractive power. The zoom lens system is adapted so as to perform variation of focal length by moving the second lens unit and the third lens unit along the optical axis while varying the airspace reserved between these lens units with the first lens unit kept stationary.

REFERENCES:
patent: 3942874 (1976-03-01), Besenmatter et al.
patent: 4906078 (1990-03-01), Inabata et al.
patent: 4912500 (1990-03-01), Yokota et al.
patent: 4976522 (1990-12-01), Igarashi
patent: 4991943 (1991-02-01), Betensky

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