Camera zoom lens

Details Camera zoom lens Camera zoom lens

1993-12-07

1996-07-30

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359714, G02B 1514, G02B 302

Patent

active

055417728

ABSTRACT:
A camera zoom lens consists of five lens elements arranged in two groups, in which the first three elements form a front lens group with a positive refractive power and the last two elements form a rear lens group with a negative refracting power. In the lens system, the front lens group is composed of a negative first lens element having its concave surface directed toward the object side of the lens system, a negative second lens element, and a positive third lens element; the rear lens group consists of a positive fourth lens element having its concave surface directed toward the object side of the lens system and a negative fifth lens element having its concave surface directed toward the object side of the lens system. The zoom lens system is suitable for use in a 35 mm lens shutter camera.

REFERENCES:
patent: 4682860 (1987-07-01), Tanaka et al.
patent: 4772106 (1988-09-01), Ogata et al.
patent: 4818081 (1989-04-01), Ito
patent: 4830476 (1989-05-01), Aoki
patent: 4838669 (1989-06-01), Ogata et al.
patent: 4991945 (1991-02-01), Estelle
patent: 5270867 (1993-12-01), Estelle
patent: 5386321 (1995-01-01), Kawamura
patent: 5412508 (1995-05-01), Lin

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