Zoom lens system

Details Zoom lens system Zoom lens system

1993-04-27

1994-03-22

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359690, G02B 1514

Patent

active

052969681

ABSTRACT:
A zoom lens system comprises from the object side to the image side: a first lens unit of a positive refractive power; a second lens unit of a negative refractive power; and a third lens unit of a positive refractive power; wherein one of the first and third lens units is shiftable along the optical axis of the lens system in both of the zooming operation and the focusing operation, and the second lens unit is also shiftable along the optical axis of the lens system in the zooming operation.

REFERENCES:
patent: 3160699 (1960-12-01), Yamaji
patent: 3972592 (1976-08-01), Ruben
patent: 4673258 (1987-06-01), Masumoto
patent: 4871239 (1989-10-01), Masumoto et al.

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