Zoom lens

Details Zoom lens Zoom lens

1994-11-18

1996-12-17

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359763, 359764, 359766, G02B 1514, G02B 960

Patent

active

055859690

ABSTRACT:
A zoom lens includes a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, a fourth lens group having a negative refracting power, and a fifth lens group having a positive refracting power in this order from the object side in order to perform zooming by varying the distance between the lens groups, the fifth lens having at least one positive lens and a cemented lens which has a negative refractive index as a whole, its positive lens being cemented to its negative lens, and the cemented surface being convex on the image side.

REFERENCES:
patent: 3533679 (1970-10-01), Baluteau
patent: 3632188 (1972-01-01), Nakamura
patent: 3970366 (1976-07-01), Sekiguchi
patent: 4033674 (1977-07-01), Sekiguchi
patent: 4437732 (1984-03-01), Ishiyama
patent: 4498741 (1985-02-01), Ishiyama
patent: 4730908 (1988-03-01), Tanaka
patent: 4854685 (1989-08-01), Corbasson
patent: 4896950 (1990-01-01), Endo et al.
patent: 5189557 (1993-02-01), Endo
patent: 5241421 (1993-08-01), Endo et al.

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