Zoom lens

Details Zoom lens Zoom lens

1997-07-15

2000-02-22

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359676, 359708, G02B 1514

Patent

active

060287160

ABSTRACT:
A zoom lens is disclosed, comprising, from front to rear, a first lens group of negative refractive power, a second lens group of positive refractive power and a third lens group of negative power, zooming being performed by varying a separation between each adjacent two of the lens groups, wherein for an object at infinity, an aspheric sphere of such shape that a negative refractive power gets progressively stronger toward the margin is applied to a lens surface of negative refracting power concave toward the object side which satisfies the following condition:

REFERENCES:
patent: 4690513 (1987-09-01), Takahashi et al.
patent: 5009536 (1991-04-01), Inoue et al.
patent: 5268792 (1993-12-01), Kreitzer et al.
patent: 5289317 (1994-02-01), Ikemori et al.
patent: 5305148 (1994-04-01), Ikemori et al.
patent: 5371631 (1994-12-01), Takada
patent: 5446592 (1995-08-01), Kohno et al.
patent: 5455714 (1995-10-01), Kohno
patent: 5485313 (1996-01-01), Betensky

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