Zoom lens system

Details Zoom lens system Zoom lens system

1998-09-29

2000-09-12

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359676, 359683, G02B 1514

Patent

active

061185922

ABSTRACT:
A zoom lens system has four or five lens units with the optical powers being +/-/+/- or +/-/+/+/-, respectively, from the object side. The image side lens unit has a negative optical power and is movable, along with at least one other lens unit, in a zooming operation. The zoom lens system satisfies the following conditions: 0.6<LBw/fw<1.7 and 0.6<.vertline.fN/fw.vertline.<1.7, where LBw represents a back focus length at the shortest focal length condition; fw represents a focal length of the zoom lens system at the shortest focal length condition; and fN represents a focal length of the image side lens unit. The lens system can be employed with a solid state imaging device, and an optical low-pass filter and an infrared blocking filter can be positioned between the lens system and the imaging unit.

REFERENCES:
patent: 4666257 (1987-05-01), Tanaka et al.
patent: 4673258 (1987-06-01), Masumoto
patent: 5105311 (1992-04-01), Tokumaru et al.
patent: 5872659 (1999-02-01), Kohno
patent: 5892626 (1999-04-01), Kohno

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