Wide-angle zoom lens

Details Wide-angle zoom lens Wide-angle zoom lens

1993-03-01

1994-07-12

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359677, 359683, 359717, G02B 1514, G02B 302

Patent

active

053294025

ABSTRACT:
A small-sized and bright wide-angle zoom lens having a variable power ratio on the order of 2 at a field angle of approximately 84.degree. and constructed of a small number of constructional lens. The wide-angle zoom lens, sequentially from an object, comprises a first lens group having negative refracting power on the whole and a second lens group having positive refracting power on the whole, wherein a magnification is varied by altering an air space between the two lens groups. In this wide-angle zoom lens, the first lens group is constructed of, sequentially from the object, two pieces of negative meniscus lenses with their convex surfaces toward the object and a positive lens with its convex surface toward the object. At least one of the negative meniscus lenses is formed with an aspherical surface. The second lens group is constructed, sequentially from the object, two pieces of positive lenses, a negative lens and a positive lens. The zoom lens is further constructed to satisfy the various conditions.

REFERENCES:
patent: 4155629 (1979-05-01), Nakamura
patent: 4185893 (1980-01-01), Ogawa et al.
patent: 4726665 (1988-02-01), Itoh
patent: 4775228 (1988-10-01), Ikemori et al.
patent: 5076677 (1991-12-01), Sato
patent: 5155629 (1992-10-01), Ito et al.
patent: 5175649 (1992-12-01), Uzawa
Patent Abstracts of Japan, vol. 11, No. 303 (P-622), Oct., 1987.

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