Compact zoom lens system having high zoom ratio and wide view an

Details Compact zoom lens system having high zoom ratio and wide view an Compact zoom lens system having high zoom ratio and wide view an

1993-10-25

1996-01-09

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

054833809

ABSTRACT:
A compact zoom lens system suitable for use with a compact camera or the like, which has a view angle of 70.degree. or more at the wide end and a zoom ratio of 2.5 or higher and in which various aberrations, particularly field curvature, distortion, axial and lateral chromatic aberrations, are effectively corrected over the entire zoom range, from the wide end to the tele end. The zoom lens system comprises, in order from the object side, a negative 1-st lens unit (G1), a positive 2-nd lens unit (G2), a positive 3-rd lens unit (G3), and a negative 4-th lens unit (G4). During zooming from the wide end to the tele end, the 1-st and 3-rd lens units (G1) and (G3) move together as one unit toward the object side, while the 4-th lens unit moves toward the object side so that the spacing between the same and the 3-rd lens unit (G3) monotonously decreases. Meantime, the 2-nd lens unit (G2) moves so that, during its movement from the wide end to the middle focal length position, it approaches the 1-st lens unit (G1), whereas, during its movement from the middle focal length position to the tele end, the 2-nd lens unit (G2) approaches the 3-rd lens unit (G3).

REFERENCES:
patent: 4682860 (1987-07-01), Tanaka et al.
patent: 4720179 (1988-01-01), Ito
patent: 4756609 (1988-07-01), Estelle
patent: 4787718 (1988-11-01), Cho
patent: 4838669 (1989-06-01), Ogata et al.
patent: 4984877 (1991-01-01), Ito
patent: 5111338 (1992-05-01), Nakayama
patent: 5126884 (1992-06-01), Sato
patent: 5144489 (1992-09-01), Shibayama
patent: 5162947 (1992-11-01), Ito
patent: 5164859 (1992-11-01), Ito
patent: 5270865 (1993-12-01), Kikuchi et al.

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