Zoom lens

Details Zoom lens Zoom lens

1987-02-17

1989-08-08

Arnold, Bruce Y.

350426, G02B 1514

Patent

active

048546836

ABSTRACT:
A zoom lens includes, in order from an object, a first lens unit having positive refracting power, a second lens unit having negative refracting power, and a third lens unit having positive refracting power. The second lens unit has a paraxial lateral magnification greater than 1 at all times. The third lens unit is fixed. The distance between the first and second lens units and the distance between the second and third lens units are relatively varied to vary the focal length of the entire lens system.

REFERENCES:
patent: 4478496 (1984-10-01), Kato
patent: 4647160 (1987-03-01), Ikemori
patent: 4721371 (1988-01-01), Imai

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