Zoom lens

Details Zoom lens Zoom lens

1994-11-25

1996-10-22

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359686, 359715, G02B 1514

Patent

active

055683231

ABSTRACT:
A zoom lens includes a front or first lens group having a positive power and a rear lens group having a variable positive power, arranged in this order from an object side. The first lens group includes at least one negative lens and at least one positive lens. The negative lens of the first lens group is located closest to an object and is provided with a concave surface located on an image side. The concave surface is made of an aspherical surface whose radius of curvature increases to reduce the negative power as the height of the concave surface from the optical axis increases. The aspherical surface satisfies the formulae:

REFERENCES:
patent: 3771853 (1973-11-01), Nakamura
patent: 4516839 (1985-05-01), Tokumaru
patent: 4846562 (1989-07-01), Tokumaru et al.
patent: 5132848 (1992-07-01), Nishio et al.
patent: 5229886 (1993-07-01), Tanaka
patent: 5276553 (1994-01-01), Tatsuno
patent: 5329401 (1994-07-01), Sato
patent: 5365376 (1994-11-01), Itoh

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