Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1991-03-29

1992-09-15

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359716, G02B 1514, G02B 1318

Patent

active

051483211

ABSTRACT:
A compact zoom lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power; and adapted so as to perform variation of focal length from the wide position to the tele position by moving the first lens unit and the third lens unit from the image side toward the object side, and displacing the second lens unit and the aperture stop so as to widen the airspace reserved between the first lens unit and the second lens unit, and narrow the airspace reserved between the second lens unit and the third lens unit. This zoom lens system has a total length shortened by thinning the first lens unit.

REFERENCES:
patent: 4854682 (1989-08-01), Yamanashi
patent: 4983027 (1991-01-01), Kojima et al.
patent: 5002373 (1991-03-01), Yamanishi

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