Zoom lens of high power varying ratio

Details Zoom lens of high power varying ratio Zoom lens of high power varying ratio

1988-02-18

1990-01-30

Arnold, Bruce Y.

G02B 1514, G02B 964

Patent

active

048969508

ABSTRACT:
A zoom lens is composed of, as counted from the object side of the lens, a first lens unit or group having a positive refractive power, a second lens unit or group having a negative refractive power, a third lens unit or group having a positive refractive power, a fourth lens unit or group having a negative refractive power and a fifth lens unit or group having a positive refractive power. Assuming that, when varying the magnifying power of the lens from a wide angle end to a telephoto end, an air space between an i-th lens unit and an i+l-th lens unit varies to a degree .DELTA.Di, the i-th lens unit has a focal length fi, the focal length of the whole lens system as obtained at the telephoto end is FT, and a space between the first and second lens units varies to a degree .DELTA.E1 between the wide angle end and the telephoto end, the zoom lens is arranged to satisfy the following conditions:

REFERENCES:
patent: 4437732 (1984-03-01), Ishiyama
patent: 4636040 (1987-01-01), Tokumaru
patent: 4749266 (1988-06-01), Takahashi et al.

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