Zoom lens system

Details Zoom lens system Zoom lens system

1994-11-15

1997-05-20

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359684, 359686, 359689, G02B 1514

Patent

active

056317751

ABSTRACT:
A zoom lens system comprising, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, a stop, a fourth lens unit having a positive refractive power and a fifth lens unit having a positive refractive power; and configured to be zoomed from a wide position to a tele position thereof by moving the second lens unit and the third lens unit so as to widen an airspace reserved therebetween, and moving the third lens unit and the fourth lens unit so as to narrow an airspace reserved therebetween with the first lens unit kept stationary. This zoom lens system has a field angle of 75.degree. at the wide position, a vari-focal ratio as high as 8, a compact size and high imaging performance.

REFERENCES:
patent: 4099846 (1978-07-01), Kawamura et al.
patent: 4266860 (1981-05-01), Hayashi
patent: 4447135 (1984-05-01), Nakamura
patent: 4775228 (1988-10-01), Ikemori et al.
patent: 5175648 (1992-12-01), Mori
patent: 5221994 (1993-06-01), Nishio
patent: 5329401 (1994-07-01), Sato

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